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Helpdesk 7th June 2012 06:38 AM

Universal PSU, Capacitor and Diode Combination Board (V2)
 
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.

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valvesound 12th October 2012 04:02 PM

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?

Thanks

pooge 12th October 2012 04:50 PM

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 13th October 2012 08:29 AM

Quote:

Originally Posted by valvesound (Post 3198960)
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 13th October 2012 08:31 AM

Quote:

Originally Posted by pooge (Post 3199016)
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 13th October 2012 08:58 AM

1 Attachment(s)
Jan Dupont and I made a similar and bigger board a few years ago for Jan's Lynx amp.
http://www.diyaudio.com/forums/group...-interest.html
http://www.diyaudio.com/forums/group...ml#post1693370

valvesound 15th October 2012 07:07 AM

Quote:

Originally Posted by pooge (Post 3199016)
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 25th October 2012 07:29 PM

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 :confused:

pdul 25th October 2012 08:20 PM

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

thor61 25th October 2012 08:58 PM

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


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