[sdiy] [Fwd: [AH] Please post to SDIY]

[Florian Anwander]

Some how Peter could not post this to the diy list, so I do the forward 
job (I don't know whether he has read access to the lest however):

-------- Original Message --------
Subject: [AH] Please post to SDIY
Date: Tue, 16 Oct 2007 05:09:17 -0700 (PDT)
From: Peter A. <noyzflore at yahoo.com>
To: analogue at hyperreal.org

Could someone please post the message below to SDIY as well since it's 
not working for me?  Thanks!



   Subject: Minimoog Problem - Please Help


   Hi everyone.

   I hope you guys can help me.

   I turned my Minimoog on today and after around 10 minutes the pitch 
went crazy, drifting
   horribly, almost like a DEEP random sample and hold kind of 
modulation.  I didn't pay close
   attention but these random pitch changes might have been up to a 
couple octaves deep (/up).

   The key contacts are clean and the connections are good, so that's 
not the problem.

   All 3 oscillators were effected.  Also, with the filter key follow 
turned off, the filter pitch
   is going nuts too when it's set to self oscillate.

   I'm pretty much a beginner when it comes to  electronics 
troubleshooting, but I do know how to
   solder, have access to a voltmeter, a scope and a can of cooling 
spray.  I know my limits and
   won't do anything I can't handle.

   I'm thinking this is a power supply problem, like maybe a bad 
capacitor, since the problem occurs
   when filter key tracking is off.  But what do I know?

   Can anyone please guide me to getting my Minimoog back into working 
order quickly?

   I'd really appreciate any help.
   Thanks!!!!!!



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