[sdiy] Discrete OTAs - (was - Best CA3280 projects?)

[Harry Bissell]

When I tried to make a spice model of an OTA using separate transistor and diode models...
it did not work.  I had to use diode connected transistors...

as Ian so succinctly put it "Matching is crucial"

(so I guess I agree :^)

H^) harry


----- Original Message -----
From: Ian Fritz <ijfritz at comcast.net>
To: Justin Owen <juzowen at gmail.com>, SDIY List <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 02 Jul 2012 15:15:59 -0400 (EDT)
Subject: Re: [sdiy] Discrete OTAs - (was - Best CA3280 projects?)

At 05:49 AM 7/2/2012, Justin Owen wrote:
>Out of the people who've experimented with designing discrete OTAs - have 
>any of you implemented the 'linearizing diodes' that the LM13700(?) had?
>
>I'd be curious to see how you did this, whether you actually used diodes 
>or half a transistor (don't laugh - that's what I've read) and what 
>advantage it got you - if any.

I used diode-connected transistors from a well-matched pair of CA 3083 
devices.  Matching is crucial.

Ian

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-- 
Harry Bissell & Nora Abdullah 4eva