Need schematic for Bauman PSU312 v1 and 1731 rev1 op amp

[megaohm]

I have searched here and google and still can't find the schematic for these two boards -
Bauman PSU312v.1
and
small 1" square discrete op amp pcb 1731 REV1

I've found discussions about these and even one link but it was a dead link.

Please, someone, help with a link or even sending the schematic direct to me would be fine.

Thanks,
P.

 

[mick]

I think this is one.

Mick

 

[mick]

And another

 

[mick]

Again

 

[mick]

For the 1731 this is all I have.

Mick

Next post by Walrus is the right one !  oops

 

[Walrus]

I've just reversed one of our old MAP (Modular Audio Products) 1731's, and have to disagree with Baumans schematic. However Peter C's RCA Melcor is correct http://twin-x.com/groupdiy/albums/userpics/RCA_MELCOR.jpg.

Why MAP used 1N4247 zeners across the output transistors is a mystery.....

 

[mitsos]

Didn't some of those PCBs  have C2 going to the wrong place?  At least the old PeterC "self etch" layout did.  Make sure C2 goes to the inverting input, and not to Q3 or Q4 (I don't remember where the wrong layout had it going). 

Walrus, thanks for sharing the trace!

 

[mick]

Mitsos your right and that reminded me, it was a long time ago now so I've found this on an old backup drive.

Mick

 

[Whoops]

These are

Didn't some of those PCBs  have C2 going to the wrong place?  At least the old PeterC "self etch" layout did.  Make sure C2 goes to the inverting input, and not to Q3 or Q4 (I don't remember where the wrong layout had it going). 

Yes there were errors in the pcb's and layouts, I remember I had problems in doing those at the time.

here are all the docs I have in my archives:

 

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And here is the BOM for the Fabio PSU

 

[Whoops]

BOM for the Fabio/Peter C Melcor 1731