>I went through the PCB layout and found one discrepancy that could cause
>problems:
>
>If you look at the schematic, A3 is supposed to have a 10M and .001mF
>strapped between pins 8 and 9. Basically there's a gap between the two and
>pin 9. Easy to fix on the existing layout.

Well spotted. Thanks Romeo.

>I also noticed a diode at the
>outputs of A2 and A4. Not sure why they're there, but I don't think they
>would hurt the design.

These are there to generate a common gate output, if needed.

Ken