[sdiy] pin 5 3080

[Paul Maddox]

Ken,

> 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!

<ROFL>

Yes this was common,
The 3080 has a REALLY high input impedance...
back in the days of the 741 (moog) the 3080 was great for the top of
ladder filters as it placed very little load on the ladder compared to the
741.

Paul Maddox
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