[sdiy] Discrete OTA

David G Dixon dixon at mail.ubc.ca
Mon Apr 7 16:38:09 CEST 2014


I always knew you did it first, and I attributed this to you in many
messages to this list four or five years ago.

It certainly wouldn't have been obvious to me, but then again, I'm not that
smart. 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Roman Sowa
> Sent: Monday, April 07, 2014 1:49 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Discrete OTA
> 
> 
> >> Incorporating the expo converter is handy, but the Osamu Hoshuyama 
> >> temperature compensation is a fairly compelling argument for the 
> >> 2164.
> 
> all this recent talk about 2164 Osamu's compensation made me 
> finally go and seek for this circuit. What a surprise it was 
> when I saw it's basically the circuit I originally posted 
> here in 1999, only refined to find the magic number of 0.27V bias.
> 
> Well, the multimania site, where I used to show ideas like 
> that, does not work anymore, and I didn't move all to 
> synth.net when it started, so there's only email atached GIF 
> that's out there. Another lesson that if something is not 
> published in internet, it does not exist.
> 
> It's not rocket science and I'm not claiming any rights to 
> this very simple circuit that is so obvious to come up with. 
> But still kinda feels like Antonio Meucci...
> 
> or maybe I'm just having a bad day today...
> 
> Roman
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