[sdiy] Discrete OTA

[houshu at muj.biglobe.ne.jp]

Hello List,

I agree that Roman is the inventor as for the SSM2164 based schematic.

Actually, the same principle was invented by Barrie Gilbert in 1983.

  Temperature compensated logarithmic circuit US 4604532 A
   http://www.google.com/patents/US4604532?hl=ja&dq=4,454,433

I think we should proud our re-invention of the same idea by Barrie.

Best,

Sam HOSHUYAMA
Saitama, JAPAN

----- Original Message -----
From: "Ian Fritz" <ijfritz at comcast.net>
To: "Phil Macphail" <phil.macphail at liivatera.com>, "Roman Sowa" <modular at go2.pl>
Cc: synth-diy at dropmix.xs4all.nl
Sent: Tuesday, April 8, 2014 03:07:33
Subject: Re: [sdiy] Discrete OTA

At 03:16 AM 4/7/2014, Phil Macphail wrote:
>If I has incorrectly attributed the design to the wrong person then I 
>apologise, but after a bit of looking around Google turns-up this on 
>Neil's website -
>http://www.milton.arachsys.com/nj71/misc/0drift.html
>
>which is dated 30th August, and the Osamu website has this page -
>http://userdisk.webry.biglobe.ne.jp/000/024/65/N000/000/000/125151002153016326829_Exp_SSM0908.PNG
>Claiming to have breadboarded the design on 28th August.
>
>So without further investigation it looks like great minds really do think 
>alike!

Not quite following you here.  The dates are ten years apart.  Clearly 
Romans invention!

Ian 

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