[sdiy] SEM LFO square wave mod...

[David G. Dixon]

> Anyone playing around with a CA3080 - or any similar OTA like 
> the LM13600 - 
> needs to know that the maximum curren tthat can go into pin 5 is 2mA.
> DO NOT connect it directly to a voltage, that will kill it 
> stone dead in a 
> microsecond.
> I always connect a 10K resistor to pin 5 (or the equivalent 
> pin) because 
> that prevents current overload, no matter what you connect it 
> to. It isn't a 
> control voltage input, it is a CURRENT control input.
> By running voltage through the resistor, you make it look 
> roughly like a 
> voltage control.

It also bears remembering that the I_abc pin in question is essentially a
couple of diode drops above the negative rail.