Universal PSU, Capacitor and Diode Combination Board (V2) - diyAudio
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Old 7th June 2012, 06:38 AM   #1
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Default Universal PSU, Capacitor and Diode Combination Board (V2)

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Last edited by Jason; 12th October 2012 at 09:17 AM.
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Old 12th October 2012, 04:02 PM   #2
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Default R11 + R12

Hi, On the schematic R11 + R12 are 1ohm resistors but on bill of material they are 10ohm. Which is correct, if it changed from 1 to 10ohm what was the reason? The snubber with 1ohm cuts at 1.5Mhz and with 10ohm at 150Mhz> Does it make a difference? I would have thought the lower (1ohm) is better?

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Old 12th October 2012, 04:50 PM   #3
pooge is offline pooge  United States
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I think you would have a more "Universal" product if you kept the ground busses separate for each polarity, instead of common, with a means for jumpering them together at the output end, if desired. Not much point in using two separate bridges unless the returns for each polarity are kept separate until after the power supply output, or with an option to stay separated until a central ground on the amplifier board.
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Old 13th October 2012, 08:29 AM   #4
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Quote:
Originally Posted by valvesound View Post
Hi, On the schematic R11 + R12 are 1ohm resistors but on bill of material they are 10ohm. Which is correct, if it changed from 1 to 10ohm what was the reason? The snubber with 1ohm cuts at 1.5Mhz and with 10ohm at 150Mhz> Does it make a difference? I would have thought the lower (1ohm) is better?

Thanks
Hi,

Sorry for the confusion but it was actually meant to be 1 to 10 ohms and with the same capacitor, it would be up to the builder where he/she would like to set the snubber frequency.

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Old 13th October 2012, 08:31 AM   #5
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Quote:
Originally Posted by pooge View Post
I think you would have a more "Universal" product if you kept the ground busses separate for each polarity, instead of common, with a means for jumpering them together at the output end, if desired. Not much point in using two separate bridges unless the returns for each polarity are kept separate until after the power supply output, or with an option to stay separated until a central ground on the amplifier board.
Hi,


I will keep that in mind in the event of future revisions.


Thanks for your feedback!
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Old 13th October 2012, 08:58 AM   #6
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Jan Dupont and I made a similar and bigger board a few years ago for Jan's Lynx amp.
LYNX Power Amp PCB Group Buy interest
Power Amp PSU Board (for e.g. LYNX Amp)
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Last edited by peranders; 13th October 2012 at 09:00 AM.
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Old 15th October 2012, 07:07 AM   #7
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Quote:
Originally Posted by pooge View Post
I think you would have a more "Universal" product if you kept the ground busses separate for each polarity, instead of common, with a means for jumpering them together at the output end, if desired. Not much point in using two separate bridges unless the returns for each polarity are kept separate until after the power supply output, or with an option to stay separated until a central ground on the amplifier board.
A very good point (excuse the pun) you are making. Single STAR GROUND POINT.
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Old 25th October 2012, 07:29 PM   #8
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Default Cap question ?

Hello every-one, When using the psu board for constructing a "F4" amp, is it ok to use 35 to 50v caps when the transformer has dual 18v secondaries ? The manual says to use 25v... Could someone please explain why a higher voltage rating could cause a problem ? Thank-you
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Old 25th October 2012, 08:20 PM   #9
pdul is offline pdul  Denmark
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Only the physical size can be a problem, not the higher voltage tolerance
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Old 25th October 2012, 08:58 PM   #10
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If using 8 capacitors on the psu board, will a 35mm diameter fit ?
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