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2010-07-22 by stompboxaron
Hi everybody, First post here. I have a MicroMoog that's been sitting around for a long time. I opened it up and the first thing I noticed is that the -15V rail is around -22V and no adjustment of R106 affects the negative voltage. It IS putting out a steady 15+V. Any ideas on where to start? Thanks, Aron
2010-07-22 by Brian
Hi Aron Your -15V regulator device is short circuit. Regards Brian G3OYU
From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of stompboxaron Sent: 22 July 2010 3:23 To: vintagesynthrepair@yahoogroups.com Subject: [vintagesynthrepair] MicroMoog power supply Hi everybody, First post here. I have a MicroMoog that's been sitting around for a long time. I opened it up and the first thing I noticed is that the -15V rail is around -22V and no adjustment of R106 affects the negative voltage. It IS putting out a steady 15+V. Any ideas on where to start? Thanks, Aron
2010-07-22 by stompboxaron
Darn. I figured so. OK, my question is - I guess there are no more dual tracking ICs available that are easy to find. Does it really need to be dual tracking? Can I wire in a -15V voltage regulator? Would that work? Alternately, any one have an MC1468 they could part with? Thanks, Aron --- In vintagesynthrepair@yahoogroups.com, "Brian" <brian@...> wrote:
> > Hi Aron > > > > Your -15V regulator device is short circuit. > > > > Regards > > Brian G3OYU > > > > From: vintagesynthrepair@yahoogroups.com > [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of stompboxaron > Sent: 22 July 2010 3:23 > To: vintagesynthrepair@yahoogroups.com > Subject: [vintagesynthrepair] MicroMoog power supply > > > > > > Hi everybody, > > First post here. I have a MicroMoog that's been sitting around for a long > time. > I opened it up and the first thing I noticed is that the -15V rail is around > -22V and no adjustment of R106 affects the negative voltage. It IS putting > out a steady 15+V. > > Any ideas on where to start? > > Thanks, > > Aron >
2010-07-22 by stompboxaron
Well, I've decided to replace the MC1468 with two voltage regulators (LM7815 and LM7915). When I get it working, I will post my documentation so people can fix their Micro Moogs very easily. Aron --- In vintagesynthrepair@yahoogroups.com, "stompboxaron" <mylists@...> wrote:
> > Darn. I figured so. OK, my question is - I guess there are no more dual tracking ICs available that are easy to find. Does it really need to be dual tracking? Can I wire in a -15V voltage regulator? Would that work? > > Alternately, any one have an MC1468 they could part with? > > Thanks, > > Aron > > --- In vintagesynthrepair@yahoogroups.com, "Brian" <brian@> wrote: > > > > Hi Aron > > > > > > > > Your -15V regulator device is short circuit. > > > > > > > > Regards > > > > Brian G3OYU > > > > > > > > From: vintagesynthrepair@yahoogroups.com > > [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of stompboxaron > > Sent: 22 July 2010 3:23 > > To: vintagesynthrepair@yahoogroups.com > > Subject: [vintagesynthrepair] MicroMoog power supply > > > > > > > > > > > > Hi everybody, > > > > First post here. I have a MicroMoog that's been sitting around for a long > > time. > > I opened it up and the first thing I noticed is that the -15V rail is around > > -22V and no adjustment of R106 affects the negative voltage. It IS putting > > out a steady 15+V. > > > > Any ideas on where to start? > > > > Thanks, > > > > Aron > > >
2010-07-23 by Paul
2011-08-31 by stompboxaron
Wow, almost one year and I still haven't fixed the MicroMoog. I gave up and ordered a 1468L chip from Hong Kong that I found on ebay. I will replace that and hopefully it will work. Otherwise, I will rewire with 3 terminal voltage regulators. Gotta get this working.