Jens,
I leave the layout to you.
Your board design skills are way beyond anything I could ever aspire to.
Yes, I would want to see the PCB in my hands before suggesting the detail of the mod I have in mind. I have a few redundant centre tapped and dual secondary transformers I want to use.
I also want to totem pole extra voltage on to the main PSU Vrails to give a regulated supply for the volt amp stages of your Leach layout and some others I have. The separate rectifiers suit this as well.
"Scalable" really means total flexibility in this thread.
I leave the layout to you.
Your board design skills are way beyond anything I could ever aspire to.
Yes, I would want to see the PCB in my hands before suggesting the detail of the mod I have in mind. I have a few redundant centre tapped and dual secondary transformers I want to use.
I also want to totem pole extra voltage on to the main PSU Vrails to give a regulated supply for the volt amp stages of your Leach layout and some others I have. The separate rectifiers suit this as well.
"Scalable" really means total flexibility in this thread.
Here are some more numbers (just measured)
The 10mVpp was measured with a lot less input capacitor.
C filter : 2 x 1000µF
C out : 22µF
Iout : 750mA => Pout 11.25W
Vripple on filter = 2.7Vpp
Vripple out = 2.8 mVpp
PSRR = -20 x log(2.8mV/2.7V) = 59dB
At 0A out the ripple noise drowns in the background noise on my scope @ 2mV/DIV
\Jens
The 10mVpp was measured with a lot less input capacitor.
C filter : 2 x 1000µF
C out : 22µF
Iout : 750mA => Pout 11.25W
Vripple on filter = 2.7Vpp
Vripple out = 2.8 mVpp
PSRR = -20 x log(2.8mV/2.7V) = 59dB
At 0A out the ripple noise drowns in the background noise on my scope @ 2mV/DIV
\Jens
a comment on power supply ripple for novices
Power supply ripple 49 db below the signal level doesn't sound great at first glance.
But it is NOT what will appear on the signal. The power supply ripple appearing in the signal will be reduced by the op amp's PSRR. If you are using the OPA2134, that's 106 db. So, there will be a bit of ripple 155 db below the nominal signal level and will be further reduced in typical applications drawing less current from the supply.
Power supply ripple 49 db below the signal level doesn't sound great at first glance.
But it is NOT what will appear on the signal. The power supply ripple appearing in the signal will be reduced by the op amp's PSRR. If you are using the OPA2134, that's 106 db. So, there will be a bit of ripple 155 db below the nominal signal level and will be further reduced in typical applications drawing less current from the supply.
Center tapped Transformer use
If you want to use a center tapped transformer (15-0-15) with this board, do the following:
OMIT D2, D4, D12, D14, C1, C8, C19, C26.
Tie the positive and negative section grounds together
Connect center tap to the combined ground
Tie together AC1-1 and AC2-1
Tie together AC1-2 and AC2-2
AC inputs to the combined AC terminals
If you want to use a center tapped transformer (15-0-15) with this board, do the following:
OMIT D2, D4, D12, D14, C1, C8, C19, C26.
Tie the positive and negative section grounds together
Connect center tap to the combined ground
Tie together AC1-1 and AC2-1
Tie together AC1-2 and AC2-2
AC inputs to the combined AC terminals
The buy closes today.
There are 61 paid orders out of 75 confirmed, and another 7 who signed up but didn't contact me.
I'll be packing and shipping over 21,000 boards and parts.
What was I thinking? 
At least I have a teenager who needs prom tickets to help me.
The boards will be delivered in about a month. I'll be packing PSU kits in the meantime. But, it will take a little longer to get this buy shipped out than the last one.
There are 61 paid orders out of 75 confirmed, and another 7 who signed up but didn't contact me.
I'll be packing and shipping over 21,000 boards and parts.
What was I thinking? At least I have a teenager who needs prom tickets to help me.The boards will be delivered in about a month. I'll be packing PSU kits in the meantime. But, it will take a little longer to get this buy shipped out than the last one.
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