9700 almost working

[KA4HJH]

>>BTW, with nothing coming out of the DAC the buffer amps all drop to the
>>negative rail in a few seconds. Didn't someone have a problem with this
>>just recently?
>
>That would be me. Maybe I should try using a -ve supply instead of gnd for
>the 4051 and lm324's. It seemed to keep drifting up for me, and my
>arrangement is very similar to the paia mcv apart from the -ve supply.

Keep in mind this was before I got around to joining the two grounds. I
haven't checked for this since. I also haven't done the diode mod to drop
the 4051 to -0.6V.

Terry Bowman, KA4HJH
"The Mac Doctor"