[sdiy] Thanks for public schematics (was Re: Discrete OTA)

[Andrew Simper]

Hi Sam,

Thank you very much for making your collection of schematics public
http://www5b.biglobe.ne.jp/~houshu/synth/ , they have been very
helpful for me, especially the re-drawing of the OSCar filter and your
ideas on making a high pass transistor ladder. I am interested in
designing new circuits and will make my designs public also. Can you
please let me know the CAD program you use for your drawings?

-- Andy


On 8 April 2014 08:45,  <houshu at muj.biglobe.ne.jp> wrote:
> 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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