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2720 VCO tuning
http://www.paia.com/talk/viewtopic.php?f=8&t=577
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Author:  Billb3 [ Thu Feb 13, 2014 8:18 pm ]
Post subject:  2720 VCO tuning

I have 1 2720-2 and 2 -2a vcos. none of them will tune to the same note per volt or tune to a proper scale. any suggestions?

Author:  PAiA-Scott [ Fri Feb 14, 2014 5:06 pm ]
Post subject:  Re: 2720 VCO tuning

Just posted the procedures for setting up these two models of PAiA VCOs over at the 2720/4700 area linked below. Cross your fingers and hope for the best with the 2720-2: It wasn't long before the 2720-2 VCO design was updated to be the 2720-2A with a more accurate zero-intercept implementation.

viewforum.php?f=31

Author:  Billb3 [ Wed Feb 19, 2014 11:52 am ]
Post subject:  Re: 2720 VCO tuning

I was finally able to get my oscillators in tune (correct scale)
- 2720-2 I changed cap C1 and then added a 343n cap in parallel
- 2720-2A I added the zero mod, changed C1, and changed R5 to 14k
- 2720-2A I added the zero mod, changed C1, removed R5, and replaced
R8 with a 5K multi turn trim pot.

I'll have to see how well this holds up under use

Bill

Author:  marcodiego [ Fri Feb 21, 2014 7:30 pm ]
Post subject:  Re: 2720 VCO tuning

Hi! I'm new here. How the heck do I do a new post? I have a vintage PAIA keyboard that I'm trying to find info about.

Thanks
Marcus

Author:  Billb3 [ Fri Feb 21, 2014 10:57 pm ]
Post subject:  Re: 2720 VCO tuning

click on New Topic

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