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 Forum index » DIY Hardware and Software » YuSynth
VCO pulse wave is very quiet
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OW



Joined: Nov 03, 2009
Posts: 121
Location: London

PostPosted: Sun Nov 18, 2012 10:36 am    Post subject: VCO pulse wave is very quiet Reply with quote  Mark this post and the followings unread

Hi,

So I just put together the VCO, I haven't tuned it yet, but all other waves seem to be working apart from the sine and square which are very quiet. Any ideas on why this might be?

Also the LEDs on my mixer only turn on when I power up the synthesiser but once powered up the go off. These modules are working fine apart from that.

Thanks!
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sun Nov 18, 2012 12:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Check that you have not inverted the wires connected to the output sockets.
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OW



Joined: Nov 03, 2009
Posts: 121
Location: London

PostPosted: Sun Nov 18, 2012 3:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for the reply. Wiring seems fine. I'm getting a negative reading from the pulse jack, is this normal?

Should I replace the TL7041? Pin 8 is reading -13 V.

Thanks!
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Tue Nov 20, 2012 3:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Are you sure that you used a TL7041 ??? U6 and U7 are supposed to be TL074. Check also the soldering of U6,R28,R52,R35
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OW



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Posts: 121
Location: London

PostPosted: Tue Nov 20, 2012 4:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Opps I meant to say TL074. Thanks, I'll check the soldering.

I just noticed that when I power it on the output of the waves is a lot louder, but gradually decreases over a period of say 5 seconds. Any Ideas why this is happening?

Thanks again!
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