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 Forum index » DIY Hardware and Software » YuSynth
vco
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carlfunken



Joined: Oct 10, 2011
Posts: 14
Location: italy

PostPosted: Wed Jan 25, 2012 3:51 am    Post subject: vco Reply with quote  Mark this post and the followings unread

Hi, my vco isn't working. I've checked the voltages:

both lm311 and tl072

-14,29 and +13,52

both tl074

+14,86
-14,83

on the long strap wire +4,35

...I've used a polysterene cap instead the silver mica, should it be polarized or not?

Thanks
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Wed Jan 25, 2012 5:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi

it doesn't need to be polarized.
Your measurment are OK. Have you checked with an oscilloscope what you get on the 220pF cap (CCool.

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Yves
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carlfunken



Joined: Oct 10, 2011
Posts: 14
Location: italy

PostPosted: Wed Jan 25, 2012 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

I've checked and just random signal...I used j111 instead j112..and normal resistors..not 1%...should it be a problem?
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Wed Jan 25, 2012 7:33 am    Post subject: Reply with quote  Mark this post and the followings unread

J111 is Ok and even better than J112.
Use 1% resistor where specified (this is important for stability and goodness of the waveshapes but cannot be the reason for the problem).

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