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 Forum index » DIY Hardware and Software
Dual-VCOs and Dual-OTAs
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Boerge



Joined: Sep 02, 2009
Posts: 40
Location: Germany

PostPosted: Sun Jan 05, 2014 4:57 am    Post subject: Dual-VCOs and Dual-OTAs Reply with quote  Mark this post and the followings unread

Hi @all and happy new year!

New year, new projects Wink
I am thinking about a dual VCO like the one in the Moog Taurus. It uses CA3080, what would happen if one replaces them by a LM13700? Would there be any bleedthrough from one VCO to the other or something like syncing? Or would it work without any problems?

regards

Boerge, whose 13key-pedal is screaming for a use...

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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
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PostPosted: Sat Jan 18, 2014 6:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have built several modules where the 13700s are shared by different circuits and have never noticed any bleed or other interaction between the two sections. None of these were VCOs tho, but VCFs, VCAs and VC-LFOs.
Make sure the chip has decoupling caps close to the power pins.
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new voodoo



Joined: May 06, 2013
Posts: 90
Location: RVA USA

PostPosted: Sat Jan 18, 2014 7:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

i wuldnt worry abt that. im sure therell b other things tho
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Boerge



Joined: Sep 02, 2009
Posts: 40
Location: Germany

PostPosted: Tue Jan 21, 2014 7:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for your replies.
Too late, I'm already soldering Wink Maybe I tell later, what happens.

Boer-"Which side of the iron is hot?"-ge

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mistercooper



Joined: Jul 17, 2006
Posts: 62
Location: Seattle

PostPosted: Sat Feb 08, 2014 7:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Boerge wrote:
Maybe I tell later, what happens.


Please do. Smile
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bod



Joined: Apr 28, 2009
Posts: 148
Location: Glasgow

PostPosted: Mon Feb 10, 2014 6:06 am    Post subject: Reply with quote  Mark this post and the followings unread

i use an LM13700 for a VCO and VCA in my wee drum/dub siren circuits and its works great without any bleed through Smile
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