[sdiy] pin 5 3080

[Scott Bernardi]

I know sometimes it's just for economy. A circuit that calls for one OTA
has an extra one if you are using one of the dual packages like
LM13600/13700 or CA3280. I noticed that on TomG's moog ladder filter.
I've also seen OTA's used warp a triangle into a sine by overdriving the
inputs - this would also use a fixed gain.

Trevor Page wrote:
> 
> mmm, these circuits require the use of a transconductance opamp?
> 
> ~ Trev
> 
> ----- Original Message -----
> From: =?iso-8859-1?q?Ken=20MacBeth?= <macbeth2600 at yahoo.co.uk>
> To: synth-diy at node12b53.a2000.nl
> Sent: Thu, 15 Mar 2001 12:53:41 +0000 (GMT+00:00)
> Subject: [sdiy] pin 5 3080
> 
> > Hi, All. Curious question, here. On some circuits I
> > see a 3080 used as an op amp. For instance in the
> > micro/multi moog schemos, filter section, one is used
> > in the regeneration loop. Pin 5 has a resistor tied to
> > the supply. I've seen this also in other circuits. I
> > thought the whole point of the OTA was to vary the
> > current/gain. Please help put me right!
> > Regards, Ken.
> >
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-- 
Scott Bernardi
sbernardi at home.net