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 Forum index » DIY Hardware and Software » YuSynth
VCO is not oscillating
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tveen323



Joined: Jan 15, 2014
Posts: 2
Location: Netherlands

PostPosted: Wed Jan 15, 2014 6:04 am    Post subject: VCO is not oscillating Reply with quote  Mark this post and the followings unread

I'm building a Yusynth VCO (LM394 version), but it won't oscillate. I;m using a TL072 for U3.

The voltages are okay in my oppinion:

Input voltage:
+15.16V
-15.05V

Output 78L15
+14.39V

Output 79L15
-14.25

U7a (Pin 1)
+4.8V

I measured on U6a (pin 1) with a osciloscope, but nothing happens at all.
Is there anything I can try to make this thing oscillate?
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tveen323



Joined: Jan 15, 2014
Posts: 2
Location: Netherlands

PostPosted: Wed Jan 15, 2014 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Problem found! Accidentally put a 47K on R17 and R18.
Now it's time to tune the whole thing!
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