| Nordic |
Ok boys and girls, get out those credit cards and order away.
https://www.dxamp.com/catalog/
Many thanks to Jack C and Ed for all the help offerd, and to Sheldon with lots of constructive advice on the schematics and files... (oops I remember now, i still have to upload the version E files... life has been hectic this week)
JackC. Rellum, Meanman and Stevox's payments are done.
I thank you for your extreme patience up to now, this was my first experience starting some kind of shop, I am more used to working in the corporate and service environments.
But, finaly we are up and running and your groupbuy is a GO!
Please don't exceed the amounts you have advised, just add a note in the comment field, that you want more, and I will advise you if there is some stock left when we start shipping. (I had a few extra units made)
I negotiated doublesided soldermasks with the white silkscreen, so the boards should look realy nice... Carlos likes blue. And as said before, the copper is double the standard thickness at 70 microns or 2 oz. in the 4 countries still not doing the metric thing. |
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| konkret |
Hi Nordic,
I just tried to create an account on your website
but I could not make it.
It did not accept my state selection and continued asking me to select a state from the list.
I tried to enter the state via keyboard before the selector appeared, but that did not work either.
Do you know a workaround for that?
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Konkret |
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| Nordic |
Hold a second, I will see If I can make it optional....
Think I got it, please try again and let me know... I suppose this another downside to useing a product developed in the American system.
I will check in a bit later, the cat kept us up all night... apparently he is a bit phsyco from the apetite stimulant, with the effect that I probably had 2 hours worth of sleep. |
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| rabbitz |
Payment done.... order no 13...... hmmmm :witch:
FYI Nordic, rabbitz = RZaudio |
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| atiq19 |
nordic,
placed an order now...looking forward to the courier delivery.
atiq |
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| Nordic |
Thank you guys, I just processed your orders.
Great, I love it when a plan comes together.
I went to fetch the transistors this morning but the BD139s were not in yet, I told them I'll come back for it in one batch on Monday.
Wait, I think they actualy deliver on larger orders.
I got the vacuum sealer this morning on the market for R45. (+-$5)
I had one just like it, but, someone borrowed it and dissapeared.
They are almost R300 in the shop.
I can confirm the order has been placed at the factory and the 66% deposit paid, if that will bring you guys some peace of mind. |
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| Francois G |
Hi Nordic,
I believe you have a revision E of the documentation ready, but the DxAMP website still has rev. D. Could you post the new version of the documentation, please.
Just paid for my order and looking forward to building the Dx HRII.
Thanks for all your hard work in making this group buy possible.
Francois |
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| Nordic |
Hi Francois, what a lekker boer name you got.
I had a bit of a crisis with the cat that the vet sent home yesterday. It kept us up all night, took him back this morning, and the vet said it was nothing serious and sent him home... went fine for an hour or two, then he had a seizure and we had to rush him to an emergency vet, quite far away.
Needless to say I am a little drained and need a bit more time to give everything a once over before I upload it. Will likely do it in a few hours, just need to unwind a little. |
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| es44 |
I placed an order as well, and wrote in comments field, that i would like the resistor set if possible.
Don't hurry too much Nordic. In my mind family has 1. priority, and hobby 2. That's the way it must be. Hope everyone here have patience, i know i have.
Have a nice week-end everybody. |
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| Nordic |
Ebbe I will see if I can adjust the amount on the super merchant's interface, for you, before it is authorised.
Nope, I can't "increase" the amount authorised originaly.
I will try to phone Pricetag in the morning to confirm how exactly I need to go about canceling an order on the que, but it won't process your card until I give them the instruction.
It is a safety feature that allows me to verify an order's authenticity before the card is processed by the super-merchant
Yes, please, there are still lots of resistor kits available...not near to breaking even on those yet, so don't be shy to order the resistor kits. |
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| Nordic |
Hallo, Francois, the version E files are up.
Just refresh the page if you still see version D. |
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| Nordic |
| dw1narso, please send me an e-mail quickly. your mail button is not showing, so I can't contact you. |
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| Francois G |
| Sorry, I thought the Icons were drag and drop. |
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| lgreen |
That order system is pretty slick, had no trouble placing mine.
I'm order #19, and I put in for one of those resistor kits...just to help you out. :)
Since I'm in USA, it is acceptable to send mine to ED L. and have him fwd it to my address; as I indicated in my order box.
thanks for putting this together |
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| Nordic |
| nope you have to copy the code next to it... |
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| Nordic |
Sorry, I have been wasteing time.
Message for US buyers::
If enough of you are interested I can ship your packages inside a single box to Ed, useing a tracked 2 day courier. You would still need to pay ED, I would assume through paypal, for shipping from him to you. But your envelopes will allready be prepared and ready for quick shipping. Meaning you will likely have your packages within a week of dispatch.
I do not trust regular registered mail enough to put such an expensive batch through in one box. It is easier to replace one or two missing postal items out of my pocket...
Just post here or drop me a mail, just say Courier or Mail
Thanks for the wonderfull support.
So far, exludeing the last order, you have paid for; 16 PCBs, 12 transistor sets and 9 resistor sets. |
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| lgreen |
| quote: | Originally posted by Nordic
Sorry, I have been wasteing time.
Message for US buyers::
If enough of you are interested I can ship your packages inside a single box to Ed, useing a tracked 2 day courier. You would still need to pay ED, I would assume through paypal, for shipping from him to you. But your envelopes will allready be prepared and ready for quick shipping. Meaning you will likely have your packages within a week of dispatch.
I do not trust regular registered mail enough to put such an expensive batch through in one box. It is easier to replace one or two missing postal items out of my pocket...
Just post here or drop me a mail, just say Courier or Mail
Thanks for the wonderfull support.
So far, exludeing the last order, you have paid for; 16 PCBs, 12 transistor sets and 9 resistor sets. |
Soo...ship to Ed or not? Looks like we really don't know yet.
Nordic, whatever is easiest for you is fine with me. Either to Ed or not up to you. I've paid and paid shipping but if I have to pay Ed again it will not be a problem. Then again if you don't want to ship a big box to Ed you can ship directly to me (you have my address).
Just let me know what you are planning to do and its all ok with me. |
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| Nordic |
Hi let me just simplify
Courier > Safe, I can send one box to Ed, by combining your shipping that would have been used for registered mail. Ed would obviously incur a cost in shipping it the last bit to you.
Registered airmail, Less safe, I will send mail to individuals... but can replace missing parcels.
Either way, what you pay me, is the same... it is just that we need about 10 guys to make up the amount the courier wants... if we can get to 9, I might spot you guys the diffirence in the courier bill. |
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| Francois G |
As one of the US group buyers I would like Courier + pay Ed the US mail.
Francois |
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| cwujek |
| quote: | Originally posted by Francois G
As one of the US group buyers I would like Courier + pay Ed the US mail.
Francois |
I would also like to go for that. But if we don't get 10 people within the next week, I'll just go for direct registered air. Thanks,
Chris |
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| Ed LaFontaine |
If you are undecided on your case work, here's what I have done. There are likely to be commercial sign makers in your area as there is in mine. They use a lot of aluminum sheet, angle, round and tube sections. They recycle the scrap. From that I have found material to make the top & bottom of enclosures. Angle makes great brackets with which I join heat sinks to the rest of the case. If wide enough your input / output connectors can go there as well.
This presumes you have some equipment to drill & tap holes. A table saw can cut sheet with the proper blade and personal protection. Cover the motor if it is not totally enclosed. You don't want shreds of aluminum in there!...:hot: |
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| konkret |
Hi Nordic,
thanks a lot for making the province field optional!
I now managed to create an account.
When I wanted to place my order I realized
that the transistor set in your offer does not include the output transistors -
but these are really the reason why I wanted to order the transistor set.
Do you have any plan to offer these 2SC5200 / 2SA1943 devices as well?
--------
Konkret |
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| RKH |
Nordic and Ed,
I'll gladly go the route of courier to Ed and pay Ed his cost for shipping to me. Count me in.
Ryan |
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| pistoljoe |
I would prefer whatever is best and easiest. If there are enough people for a courier, then I am in for that.
Ed, I am guessing paypal for a flat rate priority mail envelope?
Joe |
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| dw1narso |
Hi Nordic,
sorry... I did not check the forum yesterday...
Regards,
---
David |
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| es44 |
| quote: | Originally posted by Nordic
Ebbe I will see if I can adjust the amount on the super merchant's interface, for you, before it is authorised.
Nope, I can't "increase" the amount authorised originaly.
I will try to phone Pricetag in the morning to confirm how exactly I need to go about canceling an order on the que, but it won't process your card until I give them the instruction.
It is a safety feature that allows me to verify an order's authenticity before the card is processed by the super-merchant
Yes, please, there are still lots of resistor kits available...not near to breaking even on those yet, so don't be shy to order the resistor kits. |
Sorry, have been away for the week-end. Can i just order the resistor set aswell ?
It will be two orders, but i hope to get them as one shipment :)
Big job You have taken there Nordic, thankyou very much for that.
Best wishes.
Ebbe |
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| Harry3 |
Hi Nordic,
just paid for 2 set of boards and shipping. Thanks.
regards
Harry |
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| Nordic |
Hi Konkret, no, I would have to buy 100 of each from the local Toshiba distributor to get prices almost comparable to singles from places like Digikey etc, which charge little over a dolar each.
My cost would still be over $2... it does remind me, there is one place i have not phoned. I will give them a shout.
Will check for you where you can get the transistors in Germany or europe from a trusted source and good price, and advise you later.
Maybe some of the members have suggestions..
Ebbe I did not put through your payment, as I needed to speak to my supermerchant first.
I will cancel your first order, just place a new order with all the items you want, else the shopping cart is going to charge you for shipping twice. You will only be billed for the second amount. |
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| Nordic |
For those who asked, yes the shopping cart will send you a notice of dispatch when I process the shipments...
The cart is not perfect yet, but does seem to have some nice features like this, and printing packing lists and invoices etc. |
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| konkret |
Hi Nordic,
just managed to process my order without trouble.
Thanks!
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konkret |
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| Ed LaFontaine |
pistoljoe, I have your info.
Also, for you and others who wish their goodies to pass through my grubby paws...fees for doing so will be $4.60 for the USPS flat rate envelope and ~$.40 for paypal, if paypal is your method of choice. Mongo thinks that comes to $5 :scratch1:
Any new contacts please include your contact/mailing info, unless you feel better doing so after my response, which is fine.
Time for forwarding money will arrive when Nordic recieves the boards. |
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| Nordic |
You guys are just wonderfull!!!!
Ed, will you send me a list of the names in your group so far, just so we can make sure I don't have some, you don't, and get an innitial count.
Some news.
After the cat's seizure on Saturday, I didn't think we would see our boy again, but we got him back from hospital last night, and he seems much better now, he even slept right through the night without putting up a show. It realy warms my hart walking past him everytime. :t_ache:
They wanted to send him for an MRI scan, but that would cost about as much as my monthly pension, so, we had to decline the test. Now we just hope things go well. |
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| Nordic |
| Hey, I finaly got the transistors, anyone feel like trying to match 500 of them? |
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| AndrewT |
| quote: | Originally posted by Nordic
Hey, I finaly got the transistors, anyone feel like trying to match 500 of them? |
Hi,
group them in batches of hFE using a DMM.
Then within each group find your matched pairs of Vbe vs emtter current.
You may find that the top end of one batch may match closely with the bottom end of the next batch. |
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| Nordic |
I am in fact mostly geared towards your matching methods as also discussed in other threads... this will likely make life easier...
for the smaller transistors , I have drawn up a jig useing similar parts to the actual input stage, to kind of test them in circuit... |
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| AndrewT |
Hi,
the Vbe matching is much slower than hFE matching.
My suggestion avoids the problem of testing Vbe with grossly mismatched hFE which throws out the usability of the Vbe results.
If you have devices that are close together then the next stage of Vbe matching becomes easier and quicker. |
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| Ed LaFontaine |
Hi Nordic,
The list will be on it's way shortly. I'm asking those interested in routing their boards through me to forward funds about the time you receive the boards.
SteveA, you have mail |
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| Nordic |
| Hey guys don't panic,I hit the bandwidth limit for my server package, I just got the advice now, and did the necesary, it should be reachable in a short while... |
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| SteveA |
| quote: | Originally posted by Ed LaFontaine
Hi Nordic,
The list will be on it's way shortly. I'm asking those interested in routing their boards through me to forward funds about the time you receive the boards.
SteveA, you have mail |
Keep me posted. Eager to solder my fingers to some more boards.
SteveA |
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| Nordic |
Raait, guys and girls, the site is back up again...
If you ever need hosting, please check out digitalhost.net, most personalised help I have ever received from a host. I have been hosting all over the show since the early 90's
Lol Steve, at least I stopped grabbing the wrong end of the iron.
When I was still a boy, I once dropped the soldering iron against my shin, it did not touch me hard enough to hurt, but it killed off the pigments about the size of your little finger's pad. |
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| dw1narso |
Hi Guys,
I check recently that Farnell at Singapore has 2SA1943/2SC5200 but made by Magnatec...
Is this as good as Toshiba's?
what other suggested alternatives to use for the power output?
Farnell seems carry original Sanken's
Regards,
---
David |
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| SteveA |
I found the order site and put the 2 sets I want in the shopping cart. How do I proceed? Will the contents of the cart be viewable to Nordic without going thru checkout (which seems to require credit card info)?
Clueless in Minnesota (aka SteveA) |
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| RKH |
SteveA,
Maybe I'm confused by your question but I think you check out and pay with your credit card at Nordic's site. Once the boards get shipped to Ed LaF. then you will pay him (Ed) a nominal fee for shipping from him to you? If I've misunderstood, apologies. This presumes that you agreed to having your boards as part of a single large shipment to Ed.
Ryan |
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| Nordic |
yes, RKH has it correct, complete your transaction on the site, and send Mongo $5 via paypal.... he loves licking stamps.
David, give those transistors a shot if they are cheap enough, I for instance am useing Fairchild 2sa1943's... |
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| dw1narso |
Thanks Nordic,
Magnatec 2SA1943/2SC5200 each about Sing$7 at Farnell... I think is quite reasonable... (about USD5)
Most Sanken's are about twice of that... at Farnell
Thanks,
---
David |
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| maxlorenz |
Hi Nordic,
I forgot to ask, what is the make of your precision resistors?
M |
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| Nordic |
OMW, I will have to ask the shop to be quite honest.
I can in some cases hear a diffirence between a carbon and a metal film, but can't tell one film from another, at least not in this price range.
I can imagine 0.1% resistors (the 100R ones) would have a good result, but for the kits I can only supply 1% metal film resistors, further matched out manualy on my desk.
As stated before the boards will now accept a 10mm pitch resistor incase you would like to experiment with some fancy resistors.
Once again, in practice, this is what is in my prototype boards, and I can't say I have had the inclination to change anything on there. |
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| SteveA |
| quote: | Originally posted by RKH
SteveA,
Maybe I'm confused by your question but I think you check out and pay with your credit card at Nordic's site. Once the boards get shipped to Ed LaF. then you will pay him (Ed) a nominal fee for shipping from him to you? If I've misunderstood, apologies. This presumes that you agreed to having your boards as part of a single large shipment to Ed.
Ryan |
Ryan,
Thanks it makes sense now. And, yes, I am part of the group whose boards are being routed thru Ed.
SteveA |
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| SteveA |
| quote: | Originally posted by Nordic
yes, RKH has it correct, complete your transaction on the site, and send Mongo $5 via paypal.... he loves licking stamps.
David, give those transistors a shot if they are cheap enough, I for instance am useing Fairchild 2sa1943's... |
Order completed online. Thanks
SteveA |
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| Nordic |
| Thank you, Steven, I will process it shortly... |
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| claiborne |
I made payment through the website. Thanks!
-claiborne |
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| SamL |
Hi Nordic,
Ordered & paid on line.
Sam |
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| Nordic |
| Thank you Sam, order list updated. |
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| billabong |
Hi Nordic,
Just found out about your new big project - looks to be a good one, and I thank you for your efforts.
I have just placed and paid for an order online for 1 x PCB set + transistor set (2 ch); 1 x Amp resistor set (2 ch); 1 x Amp Transistor spare set (2 ch).
The Order Number: 32
Regards,
Billabong. |
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| Nordic |
G'day mate!!!! second order this morning from Oz...
Have you heard of the Australian kiss? Its the same as a french kiss, just down under.... :devilr: |
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| billabong |
Good one Nordic :D
We're an adventureous lot down here, with a long history of exploration. |
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| Harry3 |
Hi Nordic,
can you confirm if the trimpot is 5K or 10K? There are some posts that suggest that it is 10K.
Thanks for all the hard work.
Harry |
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| gbyleveldt |
| quote: | Originally posted by billabong
We're an adventureous lot down here, with a long history of exploration. |
That was funny! :D :D :D |
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| Nordic |
| Hi Harry, allthough my prototypes worked successfully on 5k trims there, Carlos built a few units more, and recommended we change up to the 10k value, as he had to turn some of his closer to 6k... |
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| Nordic |
| Also if you try the version without the regulators, you will need the 10k to adjust offset. |
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| dw1narso |
Hi Nordic,
sorry that I have to post this in here... cause the original thread from Carlos has been very long... and I believe he is busy working on the next generation DX...
do you know what is the input impedance of the HDII version?
this is important for me since I need to calculate line level notch filter that I like to experiment with...
also, what is the input sensitivity of this amp? (or gain actually? with recommended power supply voltage?)
I wonder if using simple passive preamp just a pot like my gainclone would work... (my gainclone with +/- 25VDC PSU has pretty sensitive input at 0.6Volt so I can easily use just a pot for passive "preamp")
Regards,
---
David |
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| Nordic |
Unfortunately my meter goes only to 2Meg ohm... not enough to measure for you... just post in the DX thread, Carlos checks it, and will gladly provide the info.
The board factory just phoned, they would have been done allready, but apparently the board v-scoreing machine got stuck... guess they are not dealing with such big orders every day.
They said I can collect tommorrow morning.
I am now going to send off PSU boards to the fab, I redesigned the PCB to take 35mm caps as I would later, when finances allows for it, like to install Sikorel caps there... will just have to manualy drill holes for the 13mm nuts on those. In the meantime it accepts standard 10mm snap in caps. Low ESR units are commonly available in 35mm.
I expect the price to be about the same as the amp boards, allthough it may differ a little due to the smaller order.
I will request qoutes on 1 and 2 oz, but I think 1 oz is more than enough considering trace widths.
I guess going on past experience, these won't be ready before Tuesday.
Let me know if you are interested, and want to keep your order so both orders can ship together.
As always, a PSU is not a cheap item. this is my first amp I feel deserves some good caps (>$10 each) (my prototype is working happily on $2 caps in the meantime).
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| Greg Erskine |
Hi Nordic,
Very nice PSU PCB. Check your thermals.
regards |
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| billabong |
Nordic,
You have mail.
Put me down for two PSU boards.
Thanks. |
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| cwujek |
Do you need two PSUs for each stereo pair? Or just one? I'll take enough PSU boards for two stereo pairs....Thanks,
Chris |
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| Nordic |
Thanks B.
Greg, care to elaborate? |
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| claiborne |
I need PSU PCB for 1 Stereo Set. Thanks!
-Claiborne |
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| Nordic |
You need 1 PSU per transformer...
So for stereo amp with shared transformer you need one PSU board,
For monoblocks i.e. 1 transformer per channel you will need 2 PSUs for a stereo set. |
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| Greg Erskine |
| quote: | Originally posted by Nordic
Greg, care to elaborate? |
Hi Nordic,
I noticed you have thermals on two of the connections on the main caps but the other six are missing. It may just be the size of the picture or my bad eyes. :D
regards |
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| Nordic |
| Sorry Greg, what are themals? Does the PSU need underpants now? |
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| Greg Erskine |
Sorry Nordic,
A "thermal" is an Eagle term and it maybe a universal term. The picture of "Thermals on" will make it clear.
regards |
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| Nordic |
Gotcha, what does it do?
I got the boards today, I was a little unhappy, as they only put soldermask on the bottom, and used the guillotine when the v-score machine broke (apparently it is fixed again now).
Luckily they cut the boards larger than the corner marks, so a little fileing should make em look tip top again. I am happy with the silkscreen, and the soldermask is 98% ok, probably equal to normal commercial grade. Do scrape away some mask on small pads, if you are scared you can not get the solder in.... one pad that caught my eye was on D1. Some of them are just fine though.
If you don't own flux, go buy some... it will help your soldering 500%.
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| Greg Erskine |
Hi Nordic,
Congradulations !!
| quote: | Originally posted by Nordic
Gotcha, what does it do? |
When components are located on copper planes it prevents the heat from the soldering iron escaping into the large copper surface.
| quote: | Originally posted by Nordic
I got the boards today, I was a little unhappy, as they only put soldermask on the bottom, and used the guillotine when the v-score machine broke (apparently it is fixed again now).? |
Soldermasks only go on the side with the traces and solder. On a single sided board that's on the bottom side of the PCB.
| quote: | Originally posted by Nordic
Luckily they cut the boards larger than the corner marks, so a little fileing should make em look tip top again. I am happy with the silkscreen, and the soldermask is 98% ok, probably equal to normal commercial grade. Do scrape away some mask on small pads, if you are scared you can not get the solder in.... one pad that caught my eye was on D1. Some of them are just fine though. |
I always sand my PCB edges. I use a piece of fine sandpaper on a flat surface and sand until the colour of the edge matches the PCB surface colour.
| quote: | Originally posted by Nordic
If you don't own flux, go buy some... it will help your soldering 500%. |
Do you use rosin cored solder? I've never needed extra flux on soldering PCBs. I do clean the PCB with alcohol before soldering to ensure all traces of oil are removed.
BTW: I've soldered a lot of different metals over the years with lots of different fluxes.
regards |
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| maxlorenz |
Hi Nordic,
Please, what is the max diameter for C1-C2 on your new PCB?
Thanks,
M |
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| destroyer X |
excelent work.... a nice contribution to our forum friends.
You should be proud.
regards,
Carlos |
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| Ed LaFontaine |
When Nordic indicates he will ship would be the time for US shipping fees to be forwarded.
Thanks to all. |
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| Nordic |
I think they should start then, I need maybe one more day to sort the components. :bawling: :bawling: :bawling:
Can't wait to build mine.
I've been sorting through resistors now for more than 13 hours. |
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| pistoljoe |
Ed,
can you shoot us an email with your paypal link when the time is right?
Joe |
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| billabong |
maxlorenz
Nordic said he redesigned the PCB to take 35mm caps (post #266).
He must have forgotten, which is understandable as he is very busy, with a lot on his mind.
edit: sorry, my mistake - I thought C1 and C2 were the main reservoir caps.
billabong. |
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| Nordic |
| Hi guys sorry for the confusion, I thought he was talking about the amp's caps, the PSU is 35mm snap in elcos. |
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| Ed LaFontaine |
| quote: | | Nordic replied: "I think they should start then..." |
Sounds like "green light go"
| quote: | | psitoljoe requested: "can you shoot us an email with your paypal link..." |
Please use the same e-mail address in our correspondence.
Thanks |
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| maxlorenz |
| Thanks guys...I was asking about the amp's C1-C2 caps, indeed... :( |
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| Nordic |
Yes Ed, it does.
Some notes;
I supplied both 0r22 and 18R for the output, if your crossover is not too complicated, first try just the 0r22 on the output. If it sounds dull like someone keeping a cushion over the speaker, do the following, bridge the position of this resistor onboard, then used the 18R in parralel with a large inductor in series with the speaker out. The binding post would be a solid connection point....
Also, I pre-adjusted the trimpots, so they are tested and ready for installation, following the silkscreen screw position. They are in plastic antistatic cases to protect them.
They should require no/little adjustment, but instructions will be available as soon as I had a day to breathe after this.
If you ordered the resistor kits and allready have the caps on hand, assembly should take 30 minutes to an hour, as you won't have to sort through strings and bags, they come in a booklet form.
If I knew a groupbuy would involve so much work, I would have worked a profit margin in. :clown:
After the groupbuy I will have to adjust the prices, it was an honour to be able to share this amp with you guys, but at some point it will have to become profitable so I can pay my fair share of advertising dues here on DIY audio. The moderators have been most generous thus far. |
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| Nordic |
PSU PSU PSU
I will add the PSU PCB's to the online catalog just now after eating.
If you want it to ship seperately, select the PSU from the catalog,
then the price will be $9.99 per PSU pcb + $7.5 shipping
if you want it to ship with your current order choose Misc. on the catalog, I have only figured out how to do flatrate mail charges on the catalog so far, it will show as $2.49, but the checkout will add $7.50 "shipping", which will make up the $9.99 price.
To order two PSU pcbs select Misc. x 2, this will be $11.48 before the $7.50 is added.
The PSU is pretty universal, and can also be used with gainclones etc. |
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| es44 |
| quote: | Originally posted by Nordic
Also, I pre-adjusted the trimpots, so they are tested and ready for installation, following the silkscreen screw position. They are in plastic antistatic cases to protect them.
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You are spoiling us Nordic :D I can for sure understand why You need to adjust prices a bit, it's only fair.
Your effort is really appreciated, You and Carlos should be on "the wall of fame" if there was a such in this forum.:cheers:
Best regards
Ebbe |
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| pistoljoe |
Ed,
done
thanks!
Joe |
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| cwujek |
| quote: | Originally posted by Nordic
You need 1 PSU per transformer...
So for stereo amp with shared transformer you need one PSU board,
For monoblocks i.e. 1 transformer per channel you will need 2 PSUs for a stereo set. |
Ok, so I am going to use one PSU PCB per stereo set. The power supply will be outside of both the amplifier boards, to keep out any possible noise. Since both amplifiers will be drawing off a PSU made for only one amplifier (I believe), won't I have to increase the wattage rating of the resistors and also increase the capacitance of the PSU caps? Or was the PSU overdesigned to take this into account? Sorry if this is a novice question, just want to make sure I do this right.
Chris |
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| AndrewT |
Hi,
I recommend the PSU RC time constant be at least double the input filter RC created by the DC blocking capacitor.
If you run two amplifiers each driving an 8ohm speaker, then the PSU sees an effective 4ohm load.
Using 4*4.7mF (with 0r0 between them), the RC= 4 * 0.0094 = 0.038 = 38mS.
The input filter should be set to <=19mS.
This will attenuate the low bass significantly.
I suggest at least doubling the PSU capacitance and you may hear improvements in low bass if you fit five times as much smoothing. I cannot say if this will degrade the amps ability to play mids or treble well/very well. |
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| Nordic |
Yes the PSU is oversized and the resistors etc in use are roughly double the power rateing of the original design...for in my view thermal stability... you can swap to higher capacitance without a problem, as the diameter provided is 35mm, and there is enough copper to allow you to drill holes and stall stud mound caps too.
even if I used 1 transformer I would use 2 PSU boards to "isolate" the channels from each other's power demands...
If you have a strong bass passage in the left channel, it would also affect the right the right channel connected to the same PSU.
I have to go pick up a few things quickly from the shops then I will post the schematic, as Andrew is handy to have around.
The PSU as is, is good too, I am useing one right now, with rather cheap caps, (-+$2).
Andrew, remember that each channel also has up to half a farad of capacitance on the amp PCB itself, depending on capacitor selection, and if you choose to use the regulated version or the slightly more powerfull non-reged version.
I left the PCB layouts for the smaller original version on the construction pages...
I do a small change on the site every day or two, adding missed spots, and expanding info, correcting mistakes etc...
The Liquid silk guy just dropped off a bunch of nice images of the cables etc. I will upload some and add the digital interconnect cables later today... they are quite a bit cheaper than their analog friends... don't ask, I'm just the distributor. |
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| Harry3 |
Nordic,
just want to confirm that the pitch for the large filter caps is 7.5mm and 10mm will not fit.
Regards
Harry |
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| Nordic |
| pitch for large filter caps is 10mm, there is 5mm pitch between those holes for optional film bypass caps that can be soldered to the bottom. |
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| salesmonster |
I just placed my order for a set of Amp and PSU PCBs with the resistor and transistor sets. I'm looking forward to getting this amp together.
Out of curiosity, has anyone here made a comparison of the Destroyer (the original or the new version) against any of the Aleph amps? |
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| Ed LaFontaine |
Earlier I referred to my e-mail address for paypal of mail funds. That has no similarity to the e-mail button below.
Please use gelafontaine"at"yahoo"dot"com |
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| destroyer X |
The Dx amplifier thread.
And those last ones are about the High Resolution II
Precision is dead....High Resolution II is sounding better.
Please, read the informs and be confortable to ask things if you
have doubts,
also my E-mail adress is for your use if needed:
panzertoo@yahoo.com
regards,
Carlos |
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