Analogue-sequencer

> got a new power supply and a new voltage regulator... and *nothing.* i
> get voltage across D6, but nothing else... i get erratic readings from
> the voltage regulator... either zero or a number that fluctuates
> beneath 1 volt...

Ok, something's not right.
First, when you say you messure the voltage across D6, what do you get?
If the voltage regulator is behaving eratically its down to one of two
things;1) Bad input voltage (not enough or too much)
2) Too much load (short circuit)

To prove which it is remove one end of D6 (PSU diode IIRC) and measure the
voltage of the regulator, both input and output.

I would suggest using an external PSu which can go from 6v upto around
12v, notmuch higher, ideally I would say a 9V regulated PSU.

Just my thoughts
Paul