[sdiy] LM331 as frequency to voltage converter

[Dan Snazelle]

Id say give it a whirl....it can be fun for a slow Cv 

Sent from my iPhone

On Oct 6, 2011, at 9:45 AM, aankrom <aankrom at bluemarble.net> wrote:

> Good to know. I actually have already built the P2V circuit that you mention. I think it's the one. It uses a 4016 and a few CA3140's and some other stuff?
> 
> Having two of the chips made me curious. There's also that circuit that uses a 40106 and an OP07. With an opamp inverting stage with some offset, I thought it might be useful, but it probably has the same problems you mention. Looking through all three volumes of Encyclopedia of Electronic Circuits can be fun, but often times disappointing...
> 
> Anthony
> 
> On Thu, 6 Oct 2011 09:31:33 -0400 (EDT), Harry Bissell wrote:
>> arrgh. It depends on how long you are willing to wait for an accurate
>> voltage, and what
>> level of ripple is acceptable. IMHO this type of circuit (tachometer)
>> is useless for
>> synth PV conversion.
>> 
>> Look for the EFM archives and read the documents suppkied with the
>> "PV-1" pitch to voltage
>> converter for a detailed description of why this is so.
>> 
>> The Korg MS-20 PV converter is the best design I know of in the
>> "tachometer" style architecture.
>> It has a four-gang pot that sets the input filter and the ripple
>> smoothing at the same time, and
>> a very unique pulse generator that works over a wider range than most
>> monostable pulse generators.
>> 
>> H^) harry
>> 
>> 
>> 
>> ----- Original Message -----
>> From: aankrom <aankrom at bluemarble.net>
>> To: synth-diy at dropmix.xs4all.nl
>> Sent: Thu, 06 Oct 2011 09:07:10 -0400 (EDT)
>> Subject: [sdiy] LM331 as frequency to voltage converter
>> 
>> Anyone ever use an LM331 as a frequency to voltage converter in a synth
>> diy app? I have two of them and I've seen some interting schematics.
>> 
>> Anthony
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> 
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