diyAudio Power Supply Circuit Board v3 illustrated build guide

well to disblame me a little, i bought F5 mono blocks from a guy in GB.
in his monos there were only 4 capacitors per block... so when i saw the UPSU with 8 of them I assumed it was symetrical and that each side was dedicayed to one channel... hence it was logical to have 1x18V per channel... but no.

when you think that my aim was more mark levinson kind of class A, and didn t wanted to put a lot of money... i end up spending much more redoing these blocks after having paid for them, than a second hand good class A ML... for a transparent class A that might not fit my taste...
it s the "Concorde" dilemna you know this fast plane between France and the US: at the middle of the project they ve spent too much to quite but too much to continue aswell
 
My Aleph J build is dual mono, although both amplifier channels are in the same case. You could certainly run them in separate cases if you prefer. But as noted, you need two of everything, one for each channel. I have two power supplies (both sides), two transformers, two amp board sets, etc. If you'd like to take a look to get the idea, here's a link to my completed project. And yes, 2x18V transformers are preferred (in its simplest implementation). You could use the 1x18V transformers, one for each rail. But they physically take up a fair bit of space. So I opted for the 2x18s.
Building mono blocks in comparison to a dual mono single chassis setup gives you the benefit of
  • separated grounds per chassis (and audio channel)
  • double the heatsink estate, which on its turn gives you the possibility for a full differential setup (4 channels in total, 2 per chassis), which on its turn doubles the voltage swing
  • extremely short distance amp to speaker (shorter cable run for better speaker control)
The only step-up to a 2 chassis differential amp setup would be a 4 chassis setup with external PSUs.

Edit: nice build!
 
Last edited:
  • Like
Reactions: 1 user
Member
Joined 2002
Paid Member
I am building mono block amplifiers, so i had to snap off the left and right side of the universal PSU board. In this case
  • which is the V- and the ground on the left board, ?
  • which is the V+ and ground on the right board ?

You require a V+ and V- inside each monoblock. This would suggest that you would need two transformers (one for each monoblock). A pair of bridge rectifiers (or use the rectifiers on the UPS board) for each monoblock. This means that you would need two complete PSU boards. One for each monoblock.

Regards,
Dan
 
Member
Joined 2002
Paid Member
well to disblame me a little, i bought F5 mono blocks from a guy in GB.
in his monos there were only 4 capacitors per block... so when i saw the UPSU with 8 of them I assumed it was symetrical and that each side was dedicayed to one channel... hence it was logical to have 1x18V per channel... but no.

when you think that my aim was more mark levinson kind of class A, and didn t wanted to put a lot of money... i end up spending much more redoing these blocks after having paid for them, than a second hand good class A ML... for a transparent class A that might not fit my taste...
it s the "Concorde" dilemna you know this fast plane between France and the US: at the middle of the project they ve spent too much to quite but too much to continue aswell
One of the most helpful things you can do when asking questions is post as many pictures as you can of what you're working on. One picture is almost worth a thousand words.

Regards,
Dan
 
Last edited: