I've successfully built a VCO using an LM13700 OTA. The circuit generates square and triangle wave. I wonder if I can add a couple of diodes and a potentiometer to be able to skew between triangle-ramp/saw and change the duty cycle of the square wave? Is it that simple?
The second schematics gives you an idea of what I meant. It's a similar circuit realised with op amps.
Any idea would be very much appreciated!