Search found 3 matches

by MHAUGHEY
Thu Jan 16, 2020 6:31 pm
Forum: Minimoog Forum
Topic: Early minimoog osc 3 dead
Replies: 0
Views: 298

Early minimoog osc 3 dead

I have a Minimoog D with early oscillator board. Osc 3 not oscillating, no sawtooth on neg side of C8 , just sitting at 0v. I have schematic + theory of operation writeup, a dmm and a scope, where should I start? Any common component failures? Osc 1 and 2 are working, so should be a good comparison ...
by MHAUGHEY
Thu Jan 16, 2020 6:22 pm
Forum: Minimoog Forum
Topic: 1975 minimoog power supply issue
Replies: 2
Views: 512

Re: 1975 minimoog power supply issue

I put the osc board back in and now the supply adjusts correctly.
by MHAUGHEY
Mon Jan 06, 2020 1:33 pm
Forum: Minimoog Forum
Topic: 1975 minimoog power supply issue
Replies: 2
Views: 512

1975 minimoog power supply issue

I am attempting to adjust the +10 and -10v rails on the power supply. I get the +10 v adjusted at 10.00 v , but I can only get the -10v rail to -9.86v before the -10v pot runs out of travel.. A couple of questions, where do the +10 and -10 v sense get their voltage from? How exactly does this work, ...