| tryonziess |
| I emailed Jens the other night to see if he had any objections to a group buy of his leach design. It was o.k. with him. Now would there be any interest out there for this project. There are several versions, ie, the 10 transistor and 6 transistor version. I am currently waiting delivery of my AAK symasym boards to build. I would like a project waiting when i finish them. Let me know of any interest in the Leach clone project. The board i am talking about can be seen at www.deltaaudio.com |
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| h_a |
You sure that the link is correct? I see only speakers there.
Cheers, Hannes |
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| tryonziess |
| thanks anthony you are correct. tad |
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| gtforme00 |
You must have read my mind, I was about to email Jens myself! I would be interested in a few pair of boards, depending on the price point. Does anyone know of a good PCB house? I'll ask around at work to see if any of the board designers know of good/cheap places. I'll also try to get up with BrianGT since he is well versed in this now.
Regards,
David |
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| tryonziess |
| I think there is a place in Atlanta that does boards fairly reasonable. If we can get a large board order the per unit price will drop significantly. I was planning on bridging two boards for 300+ watts. The parts would be cheaper than 200volt parts for the super leach. If Jens decides to do a group buy on the Super Leach i would of course buy some of them also. What are you wanting the 6 or 10 unit version. Tad |
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| gtforme00 |
Tad,
I was interested in a 6 transistor version, but will go with the flow of interest.
Are you thinking of PhotoCircuits in Peachtree City? My dad used to work for them, I'll give them a shot at a quote. I've already sent emails off to Flextron Systems, who a co-worker has recommended, and BrianGT, for advice on where to get a good value for boards.
Below are the specs I included in my Request For Quote, this is for the 6 transistor version, but I would be ok with which ever one generates the most interest. The specifics about board color thickness, and plating options are also not fixed, but these are generic values. Feel free to use this list when asking for quotes.
______________________________________________________
Material Type: FR-4
Finished Copper Thickness: 2 oz
Board Thickness: .062”
Board Dimensions: 4”x9”
Solder Mask: Both Sides
Color: Black
Silkscreen: Component Side
Minimum Line Width: 12 mil
Minimum Line Spacing: 12 mil
Number of Drill Sizes: 11
Number of Holes: 691
Smallest Hole: .6mm
Surface Mount Pads: Yes
Number of SMD Pads- Comp. side: 8
Number of SMD Pads- Solder side: 0
Finest Pitch SMD: 0603
Array: No
X-outs allowed: yes
Electrical Test: No
Plating: Copper
UL Approved: No
Quantity:
Please quote price break points up to 100 boards.
Lead Time:
Very flexible, approximately 6-8 weeks.
______________________________________________________
The next step would be to see how much interest this generates. A wiki would be nice to keep tabs on quantities. I'll work on one unless someone else who has done one before wants to knock one out quickly.
We need to at least specify the number of boards wanted, the number of transistors wanted (6 or 10), the color of the board, and whether or not gold plating is desired.
Regards,
David |
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| gtforme00 |
Is it possible to use the 10 transistor board, but only populate 2*N number of transistors? Say 4 if one needed a lower power amp, or 6, or 8?
That would make the decision of which board to use rather trivial.
Regards,
David |
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| hags |
Count me in for at least 2 boards, I would be interested in either the 6 or 10 transistor version but would prefer the 10.
Can you go 3 or 4 oz on the copper traces?
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| tryonziess |
| As soon as i gauge the interest in this project i am going to take suggestions as to the copper thickness and other aspects which might be pertinent to improving the layout. This is a large board and to keep the per unit price down i would like to order at least 50. Tad |
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| BobEllis |
I know you just said you weren't soliciting suggestions for layout improvements yet, but...
How about make the boards so that the output stage could be separated from the front end - like that shown in the superamp redesign thread. IIRC, it wouldn't take too much rework to make the needed connections fit a SIL connector.
If you were to make a 5 output pair board and provide a separation point between the first three pairs and the last two, we could just snap off the unused portion if we want to make a smaller version. Even better in my book would be to make it a 6 pair board, so we could go 3 and 3 if desired. |
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| tryonziess |
Bob, I am not to adept at drawing pcb schematics. The files for Jens board are readily available to us and I was planning on using his design. Separating the input from the output has many advantages i just do not have the program to draw it. The size of the current board Jens has drawn i believe is outside the current limits of Eagle lite.
At present i am researching the availablity of a low priced cnc router to use for small quantities of pcb's like this project. I would very much like to have the capability to mill out board projects for some of the ideas on this forum. Regards Tad Ellis |
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| BobEllis |
Drat - I was hoping that we had another expert in line. Yes, the board is too big for the free version of Eagle, Jens has the full version.
Wonder how far back we have to go to find a common ancestor? ;) |
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| pinkmouse |
| I might have time to pimp it up if Jens is happy to send me his files, but I can't do any prototyping like I did with the Krell. |
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| jacco vermeulen |
The PimpMouse ?
(not that i object to an output stage board with a fur coat logo) |
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| pinkmouse |
| Be cool brother. The Feds don't know about my pink Cadillac and collection of wide brimmed hats... ;) |
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| tryonziess |
| Al, do you have time to do a project like that with the AAK boards coming for you to assemble. Your layout expertise would be graciously received on my part anyway. Thanks Tad |
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| dudaindc |
TAD
Pending final costs, please cont me in for at least 10 boards (10 transistor version prefered).
Although some of the requested changes for the board design seem interesting, I would rather have boards that are exactly like the original board by Jens Rasmussen.
Thanks for your effort.
LS |
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| Dougie085 |
| What kind of output is the 10 transistor version capable of? And these are full class a arent they? Also anyone know roughly what the parts cost to fill these boards are? |
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| hags |
| quote: | | Although some of the requested changes for the board design seem interesting, I would rather have boards that are exactly like the original board by Jens Rasmussen. |
I agree, count me in for at least 4 boards. |
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| tryonziess |
| We are up to about 25 boards at this point. I think that is enough to get an order started. I should be getting some quotes back early this week. Thanks Tad |
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| BobEllis |
| quote: | Originally posted by Dougie085
What kind of output is the 10 transistor version capable of? And these are full class a arent they? Also anyone know roughly what the parts cost to fill these boards are? |
The Leach amp is a class AB amp. You can bias it higher within limits depending on your heat sinks and number of output devices.
The six transistor version is roughly equivalent to the standard Leach amp - good for around 125W/8R with ~58V rails.
The ten transistor version would be better suited to operation into low impedance loads or at higher voltage rails with the proper component ratings. Run it up to 70 volt rails and you should have a nice 200W+ amp. |
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| farl |
....please count me also for one set.
Farl |
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| BobEllis |
WIKI HERE to help Tad track interest.
Thanks Tad. |
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| Dougie085 |
| I'm down for at least 2, possibly 7 though depending on board costs. |
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| Dougie085 |
| How big of heatsinks do these require? I'm trying to figure out if its possible to fit 7 of these in one chassis. |
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| jacco vermeulen |
The minimum heatsink size is 10" in length and 5" high due to the size of the board. (12" long for a 10-device board)
Overhere, 12" is a standard size, 10" is not.
With 200 watt devices, such heatsinks will place the max dissipation at 150 to 170 watts (25C safety margin).
Means you'll not have to worry about your amp overheating, even not if you fancy fullrange ribbons.
Also means the minimum space requirement for a single channel is a 10"x4"x5" (L/W/H) block, depending on the lytic height used.
Tightly squeezing 7 amp units close to eachother is not recommendable, there's a risk of heat build-up between the modules.
You'll also need adequate space for 2KVA or more transformer volume, first Q would be how large you allow the case to become. |
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| BobEllis |
How about turning the boards on end - 10h x 5w with the fins vertical? Then you could make the sides of the case out of three channels and put one on the rear. There was/may still be a guy on eBay selling appropriate sinks.
You'd end up with something like 20" x 20" x 10" with plenty of room for power transformer(s) and lots of big caps inside.
If you really want to pack them in tight, You might be able to get away with sinks smaller than the boards that allow you to mount the filter caps on the bottom of the board, making each channel around 2" thick. Just don't expect to push them too hard and be reliable. |
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| tryonziess |
| I have one quote in so far of 12 dollars per board with 2.5 oz copper and .062 thickness. These are huge boards. Any input on surface finish, silver, color would be useful. Thanks Tad |
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| BobEllis |
IIRC, the last buy was .090 thick, 2 oz. copper. Advanced Circuits got ~$11.50 per at 125 pieces. The price of copper has gone up though.
I'm fine with standard green/white/silver plating. I think a thicker board should be considered given the size, though. |
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| hags |
| quote: | | I'm fine with standard green/white/silver plating. I think a thicker board should be considered given the size, though. |
I agree, .090 sounds good and I like the 2.5 traces on this current quote. |
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| dudaindc |
| quote: | Originally posted by hags
I agree, .090 sounds good and I like the 2.5 traces on this current quote. |
Ditto. |
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| Dougie085 |
| Yeah I have some of those Ebay heatsinks for an Aleph project. I just didn't think these would be generating as much heat as the aleph because they are Class A/B. 20x20x10 is huge :) I'd rather do like 2 chassis I probably don't need 7 channels could do 5 or 6. Would it be bad if the fins were going horizontal? I know its not ideal but these heatsinks are quite large. |
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| BobEllis |
You shouldn't have a problem with horizontal fins in normal home use. Pass uses horizontal sinks on the XA60.5 and others- 
I have a 4 channel Leach on the Apex jr tunnels horizontally running without a fan. They stay reasonably cool at sane listening levels, although one amp on each side is just powering the tweeters. You sinks have more surface area.
 |
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| AndrewT |
Hi,
while testing my bare uncased Leach, running 3pair @ 210mA total bias from +-58Vdc, I laid the sink flat with fins pointing down.
The 200mm by 130mm by 40mm sink became far too hot to touch within about twenty minutes. During this overheating the multiplier had reduced the bias significantly below the 210mA but fully recovered within thirty minutes of standing it back up properly.
In the upright position the sink runs at about 10C above ambient. I guess it ran @ >30C above ambient laid flat and with much reduced bias.
If these quesses are about right, then Rth s-a went from 0.5C/W to 2C/W due to orientation. |
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| BobEllis |
| My Leach amps are only at 125 mA bias, which could explain some of the difference. |
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| AndrewT |
Hi Bob,
2pair or 3pair?
Re=0r33 or higher?
Vre=?
I run Vre=24mV and Re~=0r35. |
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| Dougie085 |
| If the output devices were detatchable I could make the amp much smaller quite easily. So I'd say I'm interested in the seperate output model. And 6 amp boards. |
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| tryonziess |
| i wonder if advanced circuits still has the original information for the last group buy. where are they located. i will give them a call and see if they can do the same deal. the like the thick board idea myself. i will order the heaviest copper, within reason, that they offer. thanks for the input tad |
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| soltari_knight |
I really like the idea of having a separate output board. It gives us freedom as to the placement/connection of the board and flexibility on the amp's power. However, it goes away from the original intent of simplifying the connections. We also run the risk of improper connection and noise issues.
If we could only find ways to fool-proof the connection, as well as use noise-free, high-current interconnects...:scratch2: But definitely, I agree with tryonziess on using the heaviest copper traces... |
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| hags |
| quote: | Originally posted by tryonziess
i wonder if advanced circuits still has the original information for the last group buy. where are they located. i will give them a call and see if they can do the same deal. the like the thick board idea myself. i will order the heaviest copper, within reason, that they offer. thanks for the input tad |
I'm in favor of sticking to the original board layout as seen on http://delta-audio.com/Leach-Clone.htm.
Let's keep it as simple as possible. |
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| gmikol |
| quote: | Originally posted by BobEllis
IIRC, the last buy was .090 thick, 2 oz. copper. Advanced Circuits got ~$11.50 per at 125 pieces. The price of copper has gone up though.
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| quote: | Originally posted by tryonziess
i wonder if advanced circuits still has the original information for the last group buy. |
This may be the best bet. I don't know how long ago the last GB was, but if they've still got the tooling, that could cut the cost a little bit. Only issue is if they'll let Tad re-use the tooling since it technically belongs to Bob's account.
--Greg |
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| BobEllis |
It wasn't me - gengis ran the buy. The search engine says he was online 3 weeks ago, but he hasn't posted in almost a year. The problem with using his tooling is that it was for the 6 output version, not the one we want.
The boards were 2 oz copper for $11 at 200 pieces. So $12 for 50ish is pretty good if the quality is there. AC boards are great quality.
Tad, don't forget to add in the cost of tooling, shipping to you and packing materials when you figure out the selling price. Voice of experience. |
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| Dougie085 |
| Do you guys just do a P2P PSU? Or are there some PSU boards you could use for these? |
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| claiborne |
| You can put me down for 2 sets. Thanks! |
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| AndrewT |
Hi,
if the voltage amp board and the output board are separated, then only the output board needs the thicker copper. This could save significant money if the GB is large enough to actually order two separate PCBs.
The simple connection between the two boards is 0.1inch pitch PCB holes. That leads to many choices for the permanent or pluggable connection.
The original Jens' PCB demanded a very large area heatsink due to the layout. That can be made more compact.
Separating the PCBs can go further in allowing a smaller area heatsink. The 3pair or 6pair option does seem attractive.
What if the driver pair were kept with the 3pair output? Then twin drivers could be used for the 6pair arrangement.
A secondary advantage in separating the PCBs is removing the high current connections, which have a very high loop area in the Jens' layout, from the voltage amp stage. It will still allow the choice of a common voltage feed to all stages or separate voltages to the stages.
Take the time to rethink, gather some views and decide if changes are advisable. |
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| pool |
| I´m in for 4 boards with 10 outputs . I added myself to the wiki.. |
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| tryonziess |
| If we provide a separate power supply to the input stage, ie 10 transistor version, what would it look like. Could you show us a sketch of how you would make the two separate supplies. How much power would be necessary to just run the input stage. On Jens website he has what i consider to be a rather large voltage drop from no load to full output. With the separate stage their would be less or non at all impact on the driver stage. I like this arrangement. Putting these amps together is not going to be cheap. I would like it to be done with the final results being close to perfect. That would be nice. Thanks Tad |
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| hags |
| quote: | Originally posted by tryonziess
If we provide a separate power supply to the input stage, ie 10 transistor version, what would it look like. Could you show us a sketch of how you would make the two separate supplies. How much power would be necessary to just run the input stage. On Jens website he has what i consider to be a rather large voltage drop from no load to full output. With the separate stage their would be less or non at all impact on the driver stage. I like this arrangement. Putting these amps together is not going to be cheap. I would like it to be done with the final results being close to perfect. That would be nice. Thanks Tad |
I'm in for at least four 10 transistor version boards as shown on http://delta-audio.com/Leach-Clone.htm.
Count me out if there is any deviation from the original. |
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| jacco vermeulen |
| quote: | Originally posted by tryonziess
How much power would be necessary to just run the input stage. |
The smallest 40VCT would do, bet you a dollar i can find surplus PCB mount versions for 5 bucks/pc in 5 minutes.
Second option is placing the secondaries of a small low voltage transformer in series with the secondaries of the big donut and regulate the front end output voltage.
The latter approach has been used by Elektor mag a couple of times. PCB layouts for transformer and diodes of those designs can be found on the web.
(better to use the main fuse or protection gear, the front end needs to be switched off rapido if something happens to the output stage) |
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| hags |
| quote: | Originally posted by tryonziess
I emailed Jens the other night to see if he had any objections to a group buy of his leach design. It was o.k. with him. Now would there be any interest out there for this project. There are several versions, ie, the 10 transistor and 6 transistor version. I am currently waiting delivery of my AAK symasym boards to build. I would like a project waiting when i finish them. Let me know of any interest in the Leach clone project. The board i am talking about can be seen at www.deltaaudio.com |
I think this is turning into more than just a group buy of an established design. If we have qoutes for the 10 transistor version as stated in the original post then let's order them, if not I don't feel like playing around.
If people are going to play around with the design, changing this, adding that, deleting this, and they don't resemble the boards here http://delta-audio.com/Leach-Clone.htm I'm simply not interested. |
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| AndrewT |
Jens' layout already has separated power supplies for the voltage amp and the driver+ output stage.
The front end of mine takes about 30mA.
The peak current into the drivers can approach 500mA, so it would make sense to power these from the output stage exactly as Jens' has done.
The front end can be derived from the main supply AC by adding a small 9+9Vac transformer to the big 40+40Vac and then smoothing & regulating. Alternatively 12Vdc can be added to the 58Vdc supply after the rail fuses and then regulated. This ensures that both the low current and high current supplies go down together.
The Leach voltage amp in my assembly has never been damaged throughout any of my stupid testing errors when I have inserted the drivers swapped PNP for NPN and shorted out the drivers and swapped +ve supply for -ve supply (no damage due to using the lightbulb which was bright while I :scratch: ). The VAS protection as designed by Leach seems to work and also holds the output at near zero offset even with the drivers blown and rail fuses blown.
The one to avoid is the small fuses in the voltage stage. If only one of these blows then there is a more significant offset at the output. A CCS with shunt regulator would solve this completely for the front end supply. This gives short circuit protection and regulated supply and low HF noise and avoids the need for fuses and keeps the front end running when all else has shut down. |
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| soltari_knight |
| quote: | Originally posted by hags
I think this is turning into more than just a group buy of an established design. If we have qoutes for the 10 transistor version as stated in the original post then let's order them, if not I don't feel like playing around.
If people are going to play around with the design, changing this, adding that, deleting this, and they don't resemble the boards here http://delta-audio.com/Leach-Clone.htm I'm simply not interested. |
hags,
please keep your cool. :cool: and remember though, that this is a DIY community and not a one man's decision and likes. there are reasons why these improvements were suggested. if there are discussion with potential improvements, i would gladly lend my ears and time. that's how we "learn" here.
please do not get me wrong, i am with you. i prefer that the original board will be carried over. but we should not overlook potential improvements. and since there is no final decision yet, just hold you breath and be cool...
time to get back to the GB... :) |
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| Dougie085 |
| I don't think these are going to work for what I want to use them for. So nevermind about the 6 boards. |
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| hags |
| quote: | Originally posted by soltari_knight
hags,
please keep your cool. :cool: and remember though, that this is a DIY community and not a one man's decision and likes. there are reasons why these improvements were suggested. if there are discussion with potential improvements, i would gladly lend my ears and time. that's how we "learn" here.
please do not get me wrong, i am with you. i prefer that the original board will be carried over. but we should not overlook potential improvements. and since there is no final decision yet, just hold you breath and be cool...
time to get back to the GB... :) |
I'm cool, but, this was a group buy for an existing design and board. There are other forums for discussions on what should and shouldn't be done to this design. That was my point.
If we are purchasing the boards as shown and designed on http://delta-audio.com/Leach-Clone.htm then I'm in.
That's why I'm interested, I'm not interested in a discussion on or purchase of a redesign.
Things can and usually do get way out of hand and turn into something else entirely when going down this road.
I'm eager to build this amp, not talk about what I'd like to do to the circuit.
Let's keep it simple and straight forward. That's why I seconded the idea of contacting a production house that has already made boards of this design. Let's be consistent and stick to what works with predictable results, at least with regard to a "group buy". |
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| tryonziess |
When I started this thread I originally wanted to gauge interest in the board. I am quite happy with the original layout that Jens designed and am not quite experienced enough to change it.
I have another quote coming from a Advanced circuits for the original 10 transistor version. I am probably going to order 75 boards and pay in advance. Then if anyone wants the board this way feel free to purchase them at my cost plus shipping. The quote as it stands is for .090 board, 3 oz. copper, green color, with silkscreen, and soldermask, with standard pad finish.
ANDREW You currently have a working Jens board I presume from your comments. How does it sound, are there any unusal oscilations or bad habits. Also, would it be possible to provide a complete separate power supply to the front end transformer, regs, caps totally independent of the output section. I am new to this so be patient with my questions. Learning by doing and asking.
Now anyone with a good source on output transitors for a 40 to 60 device project do not be shy and hold back. This project is going to destroy my priorities. How nice it is. Thanks for everyones input Tad |
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| JensRasmussen |
Hello,
IMHO someone should take control and provide an offer, either of the original board from the first GB or on an updated version.....
Mind you, there is a lot of work getting a layout to come together and then the thing needs to be tested....
A seperated input and output stage holds some benefits, but I like to keep things tight in my layouts, so I always prefered the single board layout for the 6 and 10 transistor versions.
I don't really think the size of heatsink is a problem, all you need is a 30 cm long HS. IMO you will need a HS this size anyway if you want to use the full potential of the amp..
Happy GB!
\Jens |
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| AndrewT |
Hi,
if you go for the 5pair (10 output Q) then ensure you have the version that takes the NFB feed from the speaker output end and NOT from the nearest end of the output trace.
Jens,
it's not so much the length of the heatsink it's the height that is large (~130mm). Where most would choose 75 to 100mm high to fit a low height case 2u to 3u. But I think this needs a 5u case. |
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| farl |
| quote: | Originally posted by hags
I'm cool, but, this was a group buy for an existing design and board. There are other forums for discussions on what should and shouldn't be done to this design. That was my point.
If we are purchasing the boards as shown and designed on http://delta-audio.com/Leach-Clone.htm then I'm in.
That's why I'm interested, I'm not interested in a discussion on or purchase of a redesign.
Things can and usually do get way out of hand and turn into something else entirely when going down this road.
I'm eager to build this amp, not talk about what I'd like to do to the circuit.
Let's keep it simple and straight forward. That's why I seconded the idea of contacting a production house that has already made boards of this design. Let's be consistent and stick to what works with predictable results, at least with regard to a "group buy". |
I agree.... and in fact the title of this forum is "Jens Rasmussen Leach clone group buy". |
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| hags |
| quote: | Originally posted by JensRasmussen
Hello,
IMHO someone should take control and provide an offer, either of the original board from the first GB or on an updated version.....
Mind you, there is a lot of work getting a layout to come together and then the thing needs to be tested....
A seperated input and output stage holds some benefits, but I like to keep things tight in my layouts, so I always prefered the single board layout for the 6 and 10 transistor versions.
I don't really think the size of heatsink is a problem, all you need is a 30 cm long HS. IMO you will need a HS this size anyway if you want to use the full potential of the amp..
Happy GB!
\Jens |
I think tryonziess has taken control and made things easier for everyone. I like his decision and look forward to the boards. |
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| dudaindc |
| quote: | Originally posted by hags
I'm cool, but, this was a group buy for an existing design and board. There are other forums for discussions on what should and shouldn't be done to this design. That was my point.
If we are purchasing the boards as shown and designed on http://delta-audio.com/Leach-Clone.htm then I'm in.
That's why I'm interested, I'm not interested in a discussion on or purchase of a redesign.
Things can and usually do get way out of hand and turn into something else entirely when going down this road.
I'm eager to build this amp, not talk about what I'd like to do to the circuit.
Let's keep it simple and straight forward. That's why I seconded the idea of contacting a production house that has already made boards of this design. Let's be consistent and stick to what works with predictable results, at least with regard to a "group buy". |
This is pretty much my case too.
Still interested on ten 10-device boards (pending final cost).
Cheers! |
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| dudaindc |
| quote: | Originally posted by tryonziess
...
I have another quote coming from a Advanced circuits for the original 10 transistor version. I am probably going to order 75 boards and pay in advance. Then if anyone wants the board this way feel free to purchase them at my cost plus shipping. The quote as it stands is for .090 board, 3 oz. copper, green color, with silkscreen, and soldermask, with standard pad finish.
...
|
Tad
Do you have an updated quote you can share with the group at this point?
Thanks again for heading this effort.
Cheers! |
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| pchw |
I will be interested in a couple boards.
Thanks, |
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| BobEllis |
Sorry to cause any trouble. When Tad asked for improvement suggestions the tweaker in me came out. A few others chimed in, too.
I'm happy with a 10 transistor version as Jens designed, thanks Tad. |
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| soltari_knight |
bob,
no point in saying sorry. in fact, it's people like you, jens, andrewt and countless others' suggestions that made this project successful. and
if there's anyone guilty on this show, that should be me.
i only said it because hags was saying he's not going to join the group buy, and we need numbers on this buy. furthermore, the way he said it was enticing others to do the same. this is what i was trying to stop.
hags,
as i mentioned, i ask you to keep your cool because nothing is final yet. you have said your piece several times already --- that you want it to be the same as the original. that's ok. we like it that way too...
however, please remember that this project was build upon countless other's suggestions. and just because it's completed, that doesn't mean that people can't suggest further improvements. and you said it yourself, this is a "group" buy. do not discount the others just because they have have something to say...
sorry if i hurt your feelings. however, please understand the reason why i posted my previous message.
with that said... back to the GB! :D |
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| tryonziess |
Advanced Circuits has quoted 14.71 U.S. for each board quantity of 100 with 2 oz. copper and leaded solder pads in .090 thickness, green, soldermask both sides and silkscreen. I have requested a quote in 3 oz. copper which i should get this morning.
I have a few other production houses still to answer my email for quotes. Let me know your views on this board. Thanks tad |
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| cgrums |
| I'm in for at least 4 boards |
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| hags |
| quote: | Originally posted by tryonziess
Advanced Circuits has quoted 14.71 U.S. for each board quantity of 100 with 2 oz. copper and leaded solder pads in .090 thickness, green, soldermask both sides and silkscreen. I have requested a quote in 3 oz. copper which i should get this morning.
I have a few other production houses still to answer my email for quotes. Let me know your views on this board. Thanks tad |
Definitely interested in 4 boards. I would like to see what the qoute is on the 3 oz copper. |
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| tryonziess |
The quote i recieved this morning on the board with 3 oZ. copper has raised the price to almost 19.00 U.S. I do not think the extra 1 oz is worth the 5 dollar extra price. Let me know about this I am not super knowledgeable about what would or would not be sufficient copper weight.
To get the 14.71 price there is a 4 week lead time. I am not in too big of a hurry. It would take that long to sort out logistics. This thing is going good so far. Thanks Tad |
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| hags |
| quote: | Originally posted by tryonziess
The quote i recieved this morning on the board with 3 oZ. copper has raised the price to almost 19.00 U.S. I do not think the extra 1 oz is worth the 5 dollar extra price. Let me know about this I am not super knowledgeable about what would or would not be sufficient copper weight.
To get the 14.71 price there is a 4 week lead time. I am not in too big of a hurry. It would take that long to sort out logistics. This thing is going good so far. Thanks Tad |
I'm not that knowledgable and do not know if the 3 oz copper is needed or not. I can go either way on the price of the boards.
Four weeks lead time is ok with me. |
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| BobEllis |
As wide as the high current traces are, 2 oz. is overkill already.
Besides, 3 oz copper could be hard to solder without overheating the front end components. |
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| hags |
| quote: | Originally posted by BobEllis
As wide as the high current traces are, 2 oz. is overkill already.
Besides, 3 oz copper could be hard to solder without overheating the front end components. |
Well there you have it. Based on that explanation I say let's go with the 2 oz @ $14.71 per board plus shipping. |
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| tryonziess |
| The really cool thing is Advanced circuits is running a free tooling special right now which means no more cash out of our pockets. Ain't life grand. Anyway when i get everything sorted out with the sales guy i will get the order processed. I hope it will not be too hard to find 25 to 35 people who want the Jens Rasmussen 10 transistor board. Thanks to all Tad And thanks to Jens for a great design. It is really nice when people with more knowledge in these things than i are willing to share their time and expertise. |
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| dudaindc |
Tad
This is to confirm I would like to purchase ten boards.
I understand that these are 10-device boards as designed by Jens.
I also understand that these are 2 oz @ $14.71 per board plus shipping.
Please let me know what is your preferred form of payment.
Thanks for your efforts to get this going.
Cheers! |
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| jacco vermeulen |
| quote: | Originally posted by BobEllis
3 oz copper hard to solder |
Agreed.
I have the 3 Oz 10-device boards from Jens, but also have Philips pro high power solder transformers and did the parts in reverse order.
With a 2 Oz board you'd have the equivalent of a 1-Oz copper board with supply rails of 1/2" width back in the old days. |
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| tryonziess |
| I have placed the order for the 100 pcb's from Advanced Circuits. There tech guy is supposed to get back with me to make sure there will be no problems. I do not foresee any issues. So for all of those who have requested boards thanks. The wiki page is up to 68 as of this morning. Jens Rasmussen 10 transistor board, 2 oz. copper, green with white silkscreen, soldermask both sides and leaded solder pad finish. That should do it. Tad |
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| ANTHONY2181 |
Hi there,
I'm in for 4 boards.
Regards
Anthony |
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| pchw |
I am confirming to buy 4 boards.
Thanks, |
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| hags |
| quote: | Originally posted by tryonziess
I have placed the order for the 100 pcb's from Advanced Circuits. There tech guy is supposed to get back with me to make sure there will be no problems. I do not foresee any issues. So for all of those who have requested boards thanks. The wiki page is up to 68 as of this morning. Jens Rasmussen 10 transistor board, 2 oz. copper, green with white silkscreen, soldermask both sides and leaded solder pad finish. That should do it. Tad |
I'm in for 4 boards. What is the wiki page and why is it up to 68?
Thanks! |
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| gmikol |
Upped my request to 6. Is there gonna be a cut-off/waiting in case this first run gets over-subscribed, or can you increase the order form Advanced if interest peaks soon?
--Greg |
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| hags |
So my posting that I'm interested in 4 boards here means nothing? I don't know how to add myself to the list over there.
How's a new guy like me supposed to know to post somewhere else to get on a list?
Nowhere in this thread is signing up on the "wiki" page mentioned.
Brilliant.
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| BobEllis |
| Easy there Hags. It's not that hard. I posted the WIKI link early on in this thread. All you need to do is go to the page, scroll down and click the edit this page link. (you'll have to sign in again as a security precaution) Add your name and quantity as the others have done and fix up the total. Click the save button and you're done. |
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| hags |
| quote: | Originally posted by BobEllis
Easy there Hags. It's not that hard. I posted the WIKI link early on in this thread. All you need to do is go to the page, scroll down and click the edit this page link. (you'll have to sign in again as a security precaution) Add your name and quantity as the others have done and fix up the total. Click the save button and you're done. |
Thanks, but how in the hell would anyone know to do that unless you hang out here all the time?
I've been expressing interest in this buy from the beginning and I may loose out because you have to go to some other page that's not mentioned.
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| hags |
| quote: | Originally posted by BobEllis
Easy there Hags. It's not that hard. I posted the WIKI link early on in this thread. All you need to do is go to the page, scroll down and click the edit this page link. (you'll have to sign in again as a security precaution) Add your name and quantity as the others have done and fix up the total. Click the save button and you're done. |
I just signed in there. Not too user friendly, I can't figure it out.
Screw it. |
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| dudaindc |
Hags
I placed four (4) boards for you on the Wiki.
Cheers!
;) |
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| hags |
| quote: | Originally posted by dudaindc
Hags
I placed four (4) boards for you on the Wiki.
Cheers!
;) |
Thanks, sorry for the hissy fit but come on. I honestly didn't know jack about the wiki board and still don't.
Is there a sticky on the "group buy" page about it? If you need to be listed there to buy then there should be. |
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| si_jopie0382 |
Hi tryonziess,
I'm in for 2 boards and already place my nick in wiki
Regards
Jopie |
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| BobEllis |
The use of a WIKI makes it a lot easier for the person giving up his time to run a group buy - rather than have to scour the thread for numbers and have people he missed get upset, they are all there. Virtually all group buys here are run that way
Click the WIKI link on the diyaudio home page. There is a "how to do a wiki" tutorial.
Edit: Tad, AC will accept order increases, although you don't get the benefit of the higher quantity price when you do that. Congrats, you've got a winner here, 2 boards left in the original buy. |
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| Damon |
Looks like the total is 106 on the wiki.
It seems some didnt modify the total after adding there name to the list. :xeye: |
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| soltari_knight |
| tad, any instructions on how you want the payments? thanks. |
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| tryonziess |
I am about as uncomputer literate as they come. I had no idea how to make a wiki. I did however manage to get my own order on the page. I kept thinking if I have control here I will mess up for sure. Anyway I finally figured it out. That is what this entire process is all about learning new technology and enjoying the fruits of the many minor obstacles we conquer. If not for folks like Pinkmouse, AndrewT, Carlos, Nelson, Cordell, Jens and so many more with experience I would have given up long ago. Kudos to the founder of this forum and thanks.
For all of the folks who want boards. The final inspection of the zip file is not yet complete. So if I have to get 150 or 200 boards so be it. Let's just be patient. Tad |
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| tryonziess |
I have placed the order for 120 boards with Advanced Circuits. They will ship in 4 weeks. If you wish to email me with name, shipping address,number of boards wanted, e-mail address I will make a file for distribution. I am going to have to do some research on shipping charges and go to Kinkos and get some envelopes to ship these in. I will have some numbers sometime later next week. The final board price is 13.00 U.S. with new customer discount and waiving of tooling charges. I guess Paypal would be the best way to handle this. Anyone know what there percentage is??
Boards are already paid for so we should be soldering in about 6 weeks. Any suggestions to above topics gladly appreciated. Thanks Tad |
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| cgrums |
| USPS padded envelopes should be fine and paypal will allow you to pay for and print shipping labels directly...saves time and eliminates the redundancy of addressing by hand. |
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| Cambe |
Hello,
Would someone please, put me in on the wiki for two of the ten transistor PCB's, I am having browser problems and wasn't able to edit and post.
sincerely,
Cambe:cool: |
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| hags |
| quote: | Originally posted by tryonziess
I have placed the order for 120 boards with Advanced Circuits. They will ship in 4 weeks. If you wish to email me with name, shipping address,number of boards wanted, e-mail address I will make a file for distribution. I am going to have to do some research on shipping charges and go to Kinkos and get some envelopes to ship these in. I will have some numbers sometime later next week. The final board price is 13.00 U.S. with new customer discount and waiving of tooling charges. I guess Paypal would be the best way to handle this. Anyone know what there percentage is??
Boards are already paid for so we should be soldering in about 6 weeks. Any suggestions to above topics gladly appreciated. Thanks Tad |
Paypal takes 3% right off the top. Since we have at least 4 weeks would you consider alternate forms of payment?
I can send you an address label already made out .
Also, a cheaper alternative would be to place the boards between two pieces of cardboard.
This is how I send photos and have never had a problem.
Padded envelopes tend to get beat up in my neck of the woods.
I appreciate the time and effort you and others have put in to make this possible.
THANKS!!! |
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| tryonziess |
I do not really care how an individual pays for the boards. If you wisk to send a money order that is fine. I am going to have to figure out the shipping charge and paypal percetage and will post. They will be sent by mail. I have found for an item like this the post office is reliable and cheap. I plan on placing a cardboard insert into the package larger than the board to protect the corners. Does everyone agree that registered mail is necessary with proof of delivery. I assume that 2 standard rates, those within U.S. A. postal rate and an international rate should suffice for most of the postage.
I really want to build these amps. They looked so cool at Delta Audio all decked out. Nice big heavy pcb with lots of copper. Kinda like an old 50's car.
Anyway lets keep this alive and continue with the ideas. I have to start ordering parts to populate the board. Tad |
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| hags |
| quote: | Originally posted by tryonziess
I do not really care how an individual pays for the boards. If you wisk to send a money order that is fine. I am going to have to figure out the shipping charge and paypal percetage and will post. They will be sent by mail. I have found for an item like this the post office is reliable and cheap. I plan on placing a cardboard insert into the package larger than the board to protect the corners. Does everyone agree that registered mail is necessary with proof of delivery. I assume that 2 standard rates, those within U.S. A. postal rate and an international rate should suffice for most of the postage.
I really want to build these amps. They looked so cool at Delta Audio all decked out. Nice big heavy pcb with lots of copper. Kinda like an old 50's car.
Anyway lets keep this alive and continue with the ideas. I have to start ordering parts to populate the board. Tad |
I don't think registered mail is necessary, Priority mail with delivery confirmation is probably the most efficient as well as quickest way to ship USPS here in the U.S.
I am also anxious to build these amps. I have an Avel 800VA transformer sitting here collecting dust.
Any ideas for the chassis and heatsinks?
If you would email me with your address so I can send payment as well as an address label I would appreciate it. |
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| Damon |
| quote: | Originally posted by Cambe
Hello,
Would someone please, put me in on the wiki for two of the ten transistor PCB's, I am having browser problems and wasn't able to edit and post.
sincerely,
Cambe:cool: |
Done |
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