Universal PSU, Capacitor and Diode Combination Board

[Helpdesk]

This thread is for discussions about the Universal PSU, Capacitor and Diode Combination Board. For more information on this product, please see the product page below.

• Product Page
• Schematic
• Bill of Materials
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• Build Guide

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[valvesound]

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

[pooge]

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.

[JojoD818]

Originally Posted by valvesound

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.

Thanks

[JojoD818]

Originally Posted by pooge

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!

[peranders]

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)

[valvesound]

Originally Posted by pooge

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.

[thor61]

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

[pdul]

Only the physical size can be a problem, not the higher voltage tolerance

[thor61]

If using 8 capacitors on the psu board, will a 35mm diameter fit ?