[sdiy] exponential converter

[Magnus Danielson]

From: "anthony" <aankrom at bluemarble.net>
Subject: Re: [sdiy] exponential converter
Date: Sun, 5 Jun 2005 21:31:50 -0500
Message-ID: <00f401c56a3f$e67f1820$9055f442 at positronium>

> http://home.swipnet.se/cfmd/synths/schematics/oct2hz.pdf
> 
> This looks good, but the stuff alll the other guys are saying are good 
> points to ponder.

You really should be linking the new place, if you want any hope of updates:

http://rubidium.dyndns.org/~magnus/synths/schematics/oct2hz.pdf

(That is, *PLEASE* do *NOT* link http://home.swipnet.se/cfmd/ stuff at all,
go to the new site at http://rubidium.dyndns.org/~magnus/)

You fins some text on it at:

http://rubidium.dyndns.org/~magnus/synths/schematics/

It's really the ASM-1 VCO expo-converter just slightly hacked to do the
necessary I-to-V conversion. The conversion resistor (R14) needs to be adapted
according to what V-per-Hz scale you have. It is recommended to insert a
10-turn trimmer of about 10k in series with R12.

I made this after hearing year-after-year discussions on the list about the
"difficulty" to make a V/Oct to V/Hz converter. I took the schematic I already
had, cutaway the whole oscillator stuff, kept the oscillator buffer op-amp and
just fiddle with the details there. Oh, the joy of Postscript schematics! ;O)

Cheers,
Magnus

> ----- Original Message ----- 
> From: "Jeeves quimby" <phlemb2004 at yahoo.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, June 05, 2005 4:35 PM
> Subject: [sdiy] exponential converter
> 
> 
> > I've been feeling the need to build a v/Oct to v/Hz
> > converter.
> > Any suggestions would be greatly appreciated.
> >
> > Thanks,
> >
> > JPQ
> >
> >
> >
> >
> >
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