[sdiy] Redesigning CA3080 circuits to use LM13600/13700?

[harrybissell]

Woah, good point Unkel Mike.

I never noticed that before. I've been assuming 2Vbe for simulations in both
cases. (well, for simulating the current sources driving the OTA).

I'm enlightened :^P

H^) harry

"Mike I." wrote:

> One gotcha to be aware of is that the Iabc input on the 13600/13700 uses a
> different internal current mirror circuit than the 3080... it sits at a
> nominal 2 Vbe above the (-) supply pin, where the 3080 sits at one Vbe above
> the (-) supply pin. Not normally a problem with the typical expo current
> sources and linear current sources used in filters, VCAs etc running on +/-
> 15V... but could create difficulties with low-voltage battery-powered stuff.
> Cheers, Mike