Hi kro5998,
I was wrong, I didn't see it at the ESP site and couldn't find it anymore.
(I guess I do too much reading about audio electronics on the net lately.....
)
But a quick search with Google helped and I found it back, I saw it at:
The JLH Class-A Amplifier Site
It's a copy of the ESP site, but a version with the same type of power device (NPN 2N3055) in the "+" and the ''-" supply.
It presents a nice idea in the text too: Using the "rejected/leftover" power devices (in our case MOSFETS) from the matching process of the output devices for the powerstage of an amp as the series regulator device in the CM!!
I was wrong, I didn't see it at the ESP site and couldn't find it anymore.
(I guess I do too much reading about audio electronics on the net lately.....
)But a quick search with Google helped and I found it back, I saw it at:
The JLH Class-A Amplifier Site
It's a copy of the ESP site, but a version with the same type of power device (NPN 2N3055) in the "+" and the ''-" supply.
It presents a nice idea in the text too: Using the "rejected/leftover" power devices (in our case MOSFETS) from the matching process of the output devices for the powerstage of an amp as the series regulator device in the CM!!
Attachments
Hi, I'm sorry for not having participated in this thread the last days. I'm pretty busy with other things.
I think this groupbuy isn't gonna work out, bacause of the deversity of parts. Personally I'm not gonna buy $50 /pc caps. That's to expensive for a student. Lets say we only buy small signal conductors for pcb mounting?
I think this groupbuy isn't gonna work out, bacause of the deversity of parts. Personally I'm not gonna buy $50 /pc caps. That's to expensive for a student. Lets say we only buy small signal conductors for pcb mounting?
multiplier
Over the new year weekend i finished my capacitance multiplier boards. they use 98000uF per board and TIP35/36 as output devices (40 A).I am going to use EI-core transformers which i rewind myself.Output of the boards will be 2 x 14V/4A and the dissipation is around 24 Watt.
Total cost so far 8 Euro.Mostly used parts lying around.
Anybody know how to get a pair of HifiZen/Alpha boards?
I like them better than Kari's board because of the extra options(protecting diodes,compensation caps) and because i think Kari's boards are better suited for a high power Aleph-X.
Over the new year weekend i finished my capacitance multiplier boards. they use 98000uF per board and TIP35/36 as output devices (40 A).I am going to use EI-core transformers which i rewind myself.Output of the boards will be 2 x 14V/4A and the dissipation is around 24 Watt.
Total cost so far 8 Euro.Mostly used parts lying around.
Anybody know how to get a pair of HifiZen/Alpha boards?
I like them better than Kari's board because of the extra options(protecting diodes,compensation caps) and because i think Kari's boards are better suited for a high power Aleph-X.
Attachments
Sander,
i´m a poor student too, but maybe we can get high quality caps for a really good price if there are enough people participating in the groupbuy. I don`t think there are many people who want to spend extraordinary $50 per cap! But i can emagine some are willing to pay $25 for a $50 cap. It will be necessary to specify manufacturer, values and (low)prices to tempt people tu jump onto the groupbuy.
Kari is going to send out his AX boards at the end of january. I think the interest in parts will increase rapidly after people got their boards.
Untill then there is enough time to get quotes and specify part.
Yes one problem is that there are too much diverse parts we are talking about in this thread. In my opinion the most important parts for a groupbuy are the MOSFETs because of the need for matching which can be done very closely with a great number of devices. But we need to find someone who is willing and able to do the matching. Maybe this should be a seperate groupbuy cause i don´t think that anybody wants to handle a big groupbuy and the matching which will be a lot of work. The person who does this job could at least get his FETs for free!
Just some thoughts.
illusionxx.
i´m a poor student too, but maybe we can get high quality caps for a really good price if there are enough people participating in the groupbuy. I don`t think there are many people who want to spend extraordinary $50 per cap! But i can emagine some are willing to pay $25 for a $50 cap. It will be necessary to specify manufacturer, values and (low)prices to tempt people tu jump onto the groupbuy.
Kari is going to send out his AX boards at the end of january. I think the interest in parts will increase rapidly after people got their boards.
Untill then there is enough time to get quotes and specify part.
Yes one problem is that there are too much diverse parts we are talking about in this thread. In my opinion the most important parts for a groupbuy are the MOSFETs because of the need for matching which can be done very closely with a great number of devices. But we need to find someone who is willing and able to do the matching. Maybe this should be a seperate groupbuy cause i don´t think that anybody wants to handle a big groupbuy and the matching which will be a lot of work. The person who does this job could at least get his FETs for free!
Just some thoughts.
illusionxx.
Speaking of caps and the right resistance value to put in the PSUD2 modeler. Most ESR values are taken at 100khz so wouldn't it be more appropriate to use the 120hz ESR value? I wonder if the modeler takes this into account when it does its calculation. Which value ESR does the modeler expect to see? This information isn't listed anywhere in the help section so if anyone familiar with that program could help tell us the math on the PSUD2 capacitor resistance input I'm sure we would get more accurate results.
multiplier
Just finished testing my multiplier PSU.
I set the output voltage at 13 Volts, the current as measured was 4.8 Amp per rail.(input is 13.5 Volt AC)
The upper trace is 2mV/div. and is the output.
The lower trace is 500mV/div. and is before the power transistor.
The collector/emitter voltage was adjusted at 3 Volts.
I use a SK01 heatsink of 200mm for the bridge and the transistors.Heatsink temp was 48 C.
Just finished testing my multiplier PSU.
I set the output voltage at 13 Volts, the current as measured was 4.8 Amp per rail.(input is 13.5 Volt AC)
The upper trace is 2mV/div. and is the output.
The lower trace is 500mV/div. and is before the power transistor.
The collector/emitter voltage was adjusted at 3 Volts.
I use a SK01 heatsink of 200mm for the bridge and the transistors.Heatsink temp was 48 C.
Attachments
don't worry
Hey Illusionixx,
I bought 25 IRFP240 from reichelt, all out of the same LOT. I can use them all, matched in bunches of 6 within 35 mV.
The same with the IRF9610: bought 15 and got 3 pairs matched within 1 or 2 mV (I guess, that my measuring setup is not that accurate). The rest is still usable, according to the 10mV bandwidth N. P. suggests. I'm very pleased with the mosfets and the matching.
Cheers Thomas
P.S. Still need Heatsinks: 300mm x 150mm, less than 0,25 C/W
Hey Illusionixx,
I bought 25 IRFP240 from reichelt, all out of the same LOT. I can use them all, matched in bunches of 6 within 35 mV.
The same with the IRF9610: bought 15 and got 3 pairs matched within 1 or 2 mV (I guess, that my measuring setup is not that accurate). The rest is still usable, according to the 10mV bandwidth N. P. suggests. I'm very pleased with the mosfets and the matching.
Cheers Thomas
P.S. Still need Heatsinks: 300mm x 150mm, less than 0,25 C/W
threefff,
did you tell them at Reichelt that you needed all out of the same LOT or did you just order them and had good luck?
Which board are you going to use?
Have you allready collected all the parts except the heatsinks?
I`m very busy at the moment so the AX has to wait. How much output power are you planning with?
illusionxx
did you tell them at Reichelt that you needed all out of the same LOT or did you just order them and had good luck?
Which board are you going to use?
Have you allready collected all the parts except the heatsinks?
I`m very busy at the moment so the AX has to wait. How much output power are you planning with?
illusionxx
Hi Illu,
maybe we should not highjack this thread for personal interests, but to be honest, I cannot figure out how to make my e-Mail adress visible in the user data and yours is not visible either.
Anyway, your questions:
- Yes, I told them
- Im building aleph2s and use a board I found on the forum intended for aleph4s.
- Yes, almost. I bought 70 caps Paccom ES 15.000µF 63V for 50 Euros altogether at J.E.A. (you'll find him in the stores of ebay.com) Shipping was somewhat expensive for 29 Euros. ESR is not too bad and not too good, so paralleling is the choice.
Besides the heatsinks I still miss inductance free resistors. Probably I'll take Allen Bradley carbon comp resistors for the low wattage and MOX for the high wattage.
But that will be the future, let's see how it all turns out before I'm finished.
Have fun
Thomas
maybe we should not highjack this thread for personal interests, but to be honest, I cannot figure out how to make my e-Mail adress visible in the user data and yours is not visible either.
Anyway, your questions:
- Yes, I told them
- Im building aleph2s and use a board I found on the forum intended for aleph4s.
- Yes, almost. I bought 70 caps Paccom ES 15.000µF 63V for 50 Euros altogether at J.E.A. (you'll find him in the stores of ebay.com) Shipping was somewhat expensive for 29 Euros. ESR is not too bad and not too good, so paralleling is the choice.
Besides the heatsinks I still miss inductance free resistors. Probably I'll take Allen Bradley carbon comp resistors for the low wattage and MOX for the high wattage.
But that will be the future, let's see how it all turns out before I'm finished.
Have fun
Thomas
Hi,
so let me get back to the heatsinks.
deltour offered me the DEF26 in black anodized with a length of 150mm for 69,75 Euro +VAT and the DEF103 in the same format for 78,10 Euros +VAT per piece when I take 4 of them.
The 103s need forced cooling so I only take the 26s into concern.
Anybody interested in the same types so that we can ask for reduction?
Some other thoughts about heatsinks:
Take a 10mm base plate aluminium (300mm x 150mm = 0,045 m²)
Bolt 10 pieces of 80 x 20 rectangular profile (150mm long) on it.
Insert a piece of steel (100mm 15x15mm²) into the fins (profiles) to ensure a more equal pressure distribution between base plate and fins.
Anodisze it.
Prices?
Baseplate: 0,045 x 275 Euro = 12,37
Fins: 1,5 meters a 9,80 Euro = 14,7
Screws: 20 x 0,25 = 5 Euro
Steel: 10 x 100mm = 1m x 13 Euro
Anodizing: ? (I just check)
That sums up to 45 Euro, without anodizing, sawing and drilling. Sounds not worth it.
What do you think?
Cheers
Thomas
so let me get back to the heatsinks.
deltour offered me the DEF26 in black anodized with a length of 150mm for 69,75 Euro +VAT and the DEF103 in the same format for 78,10 Euros +VAT per piece when I take 4 of them.
The 103s need forced cooling so I only take the 26s into concern.
Anybody interested in the same types so that we can ask for reduction?
Some other thoughts about heatsinks:
Take a 10mm base plate aluminium (300mm x 150mm = 0,045 m²)
Bolt 10 pieces of 80 x 20 rectangular profile (150mm long) on it.
Insert a piece of steel (100mm 15x15mm²) into the fins (profiles) to ensure a more equal pressure distribution between base plate and fins.
Anodisze it.
Prices?
Baseplate: 0,045 x 275 Euro = 12,37
Fins: 1,5 meters a 9,80 Euro = 14,7
Screws: 20 x 0,25 = 5 Euro
Steel: 10 x 100mm = 1m x 13 Euro
Anodizing: ? (I just check)
That sums up to 45 Euro, without anodizing, sawing and drilling. Sounds not worth it.
What do you think?
Cheers
Thomas
It is, it is !
I built heatsinks like that myself, both welded and tapped.
The alloy can be bought for scratch at salvage yards.
The downside is that if you count your hours diy heatsinks become very expensive.
I did it in my student days, even built a 36 foot sailing yacht in those days.
Now, my time is precious, i can make more money in other ways than saving some with hard labor on heatsinks.
I built heatsinks like that myself, both welded and tapped.
The alloy can be bought for scratch at salvage yards.
The downside is that if you count your hours diy heatsinks become very expensive.
I did it in my student days, even built a 36 foot sailing yacht in those days.
Now, my time is precious, i can make more money in other ways than saving some with hard labor on heatsinks.
The IMHO way to go (If you cannot get a group buy organized for a good price ) is to try and get them second hand, from scrapped equipment, surplus shops, eBay etc.
This usually takes time and it can be difficult to find the heatsinks that you like and suit the job (and your wallet ), but it is possible to find them.
It sure can be a lot cheaper than buying new ones.
Same goes for power caps and transformers.
If you don't want to or cannot wait you will have to pay the price I'm afraid.....
) is to try and get them second hand, from scrapped equipment, surplus shops, eBay etc.This usually takes time and it can be difficult to find the heatsinks that you like and suit the job (and your wallet
), but it is possible to find them.It sure can be a lot cheaper than buying new ones.
Same goes for power caps and transformers.
If you don't want to or cannot wait you will have to pay the price I'm afraid.....
hi jacco,
yes, time is precious, that's true anyway. But for DIY you need to spend some...
I better do not report, what I built in my student days, although a sailing boat was only under consideration, not more.
Hey byteboy,
I searched the web (and this forum) for almost the last six month and did not find surplus or used heatsinks of the desired format. Maybe I'm not flexible enough with the size and optics.
The best offer I found 'til today are these deltour DEF26 heatsinks mentioned earlier in this thread:
They offered me:
Prices for larger quantities DEF26/150/zw:
Price/piece delivery qt 10 pieces: Euro 64.20
Price/piece delivery qt 20 pieces: Euro 58.60
Price/piece delivery qt 50 pieces: Euro 50.15
And for large quantities only they offered me the DEF123, they don't have pressed in fins, but are extruded as the whole piece (R-th like the 26s).
DEF123/150/zw
Price/piece delivery qt 50 pieces: Euro 42.25
All prices are ex VAT and shipping (remember: size is 300 x 150 mm², fins parallel to the 150mm).
Any better suggestions?
As I need 4, who would take some others?
so long
Thomas
yes, time is precious, that's true anyway. But for DIY you need to spend some...
I better do not report, what I built in my student days, although a sailing boat was only under consideration, not more.
Hey byteboy,
I searched the web (and this forum) for almost the last six month and did not find surplus or used heatsinks of the desired format. Maybe I'm not flexible enough with the size and optics.
The best offer I found 'til today are these deltour DEF26 heatsinks mentioned earlier in this thread:
They offered me:
Prices for larger quantities DEF26/150/zw:
Price/piece delivery qt 10 pieces: Euro 64.20
Price/piece delivery qt 20 pieces: Euro 58.60
Price/piece delivery qt 50 pieces: Euro 50.15
And for large quantities only they offered me the DEF123, they don't have pressed in fins, but are extruded as the whole piece (R-th like the 26s).
DEF123/150/zw
Price/piece delivery qt 50 pieces: Euro 42.25
All prices are ex VAT and shipping (remember: size is 300 x 150 mm², fins parallel to the 150mm).
Any better suggestions?
As I need 4, who would take some others?
so long
Thomas
Quote for F&T PSU caps
Hello everybody,
i´ve asked for a quote for the Fischer & Tausche high quality caps.
It is 23,33 EURO/pc for 47000uF 63V if we take 100pcs.
To all who are new to this thread:
The Fischer&Tausche caps are the same as Thel and Mundorf
which are all produced by Krummer (Serie 901).
The specs are:
D=91mm; h=70mm
L= 12nH; tan-d = 0,22
ESR typ = 0,005 Ohm
Ripplecurrent = 100A
Temperature: -40 bis +85°
Lifetime +40° = >540.000 h
Lifetime +85° = >20.000 h
The caps are really cheap compared to about 70 Euro/pc at Thel or Mundorf and even better than the RIFA caps. Simply the best quality one can get.
If there is enough interest in these caps i could offer a groupbuy.
Tell me what you think,
illusionxx.
Hello everybody,
i´ve asked for a quote for the Fischer & Tausche high quality caps.
It is 23,33 EURO/pc for 47000uF 63V if we take 100pcs.
To all who are new to this thread:
The Fischer&Tausche caps are the same as Thel and Mundorf
which are all produced by Krummer (Serie 901).
The specs are:
D=91mm; h=70mm
L= 12nH; tan-d = 0,22
ESR typ = 0,005 Ohm
Ripplecurrent = 100A
Temperature: -40 bis +85°
Lifetime +40° = >540.000 h
Lifetime +85° = >20.000 h
The caps are really cheap compared to about 70 Euro/pc at Thel or Mundorf and even better than the RIFA caps. Simply the best quality one can get.
If there is enough interest in these caps i could offer a groupbuy.
Tell me what you think,
illusionxx.
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