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 Forum index » DIY Hardware and Software » YuSynth
MINIMOOG VCF the cutoff didnt work at all
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bombomdisco



Joined: Aug 19, 2013
Posts: 1
Location: China

PostPosted: Mon Aug 19, 2013 8:59 am    Post subject: MINIMOOG VCF the cutoff didnt work at all
Subject description: MINIMOOG VCF the cutoff didnt work at all
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HI ,Yves ,i found you guys made MINIMOOG VCF few years ago ,i was so excited to clone it .
Followed your website ,step by step ,i finally finished it .
however , the cutoff didnt work at all .
i've checked too many times and days ,no result :<
EMPHASIS works good it can easily get oscillated by fully clockwise.
And also the output sounds as loud as the original source ,a little bit warmer without distorction .
So Cutoff confuse me alot,could you pliz tell me ,which parts i should check more over again ?
thank you very much
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Tue Aug 20, 2013 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Start with the simplest things first -

The Cutoff knob should produce a variable voltage on the center pin. Make sure it does. If it doesn't, verify that the other two pins are going where they should

Once that is working correctly, just follow the voltage. There will be an op-amp that sums the control voltages together. Make sure it's output is moving properly. If not, check the +/- power and and the feedback loop on the op-amp.

Just keep following the CV path until you find the problem...

Good luck
Gary
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yusynth



Joined: Nov 24, 2005
Posts: 1214
Location: France

PostPosted: Wed Aug 21, 2013 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, do as Mongo1 says, this is the logical path to follow.
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Yves
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