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 Forum index » DIY Hardware and Software » YuSynth
Minimoog filter started having problems
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Tue May 07, 2013 3:18 pm    Post subject: Minimoog filter started having problems Reply with quote  Mark this post and the followings unread

I built Yusynth's Minimoog filter about four years ago, and use it often.

I turned my modular on the other day and it had stopped passing signal. Somehow, the wire that connects the Cutoff pot with ground has come loose. I soldered it back, turned it on, and still nothing.

I fed a 0-6vpp saw tooth from my ARP Odyssey oscillator into the filter.

The signal at the input (pin 6) of the TL072 I read at -6 to -3vpp and there's no signal at the output (pin 7).

I've swapped out the TL072, but I still have the same problem, so it's not the opamp.

If someone could shed some light on this problem, that would be great!

Thanks,

Matt
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ranioItaly



Joined: Feb 18, 2013
Posts: 13
Location: Italy

PostPosted: Wed Aug 28, 2013 8:13 am    Post subject: Reply with quote  Mark this post and the followings unread

hallo matt,
have you checked the 15V at the pin 8 refer to ground and the -15V at the pin 4?
what do you mean with"The signal at the input (pin 6) of the TL072 I read at -6 to -3vpp"?
Have you read it from an oscilloscope ?
The Vpp value is always positive, is the sum of the negative half wave and the positive half wave (i.e. +5V max and -5vmax =10 Vpp)

Bye
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