I'd like to have such an AC square wave oscillator putting AC through a load - which can go to 60 VDC and deliver no more than 50 mA with sharp, fast rise times and very "square". I would hope a topology exists.
The biggest request/demand I have is a circuit which would use the least amount of components, especially ICs if there would be any ICs then please a topology with ICs that have the least amount of pins. In other words, I am looking for an oscillator which can be thrown together onto a breadboard rather quickly. I need an actual circuit, not an output from a function generator.
Frequency: 3.9 Hz Duty: 50% Load: Resistive, no smaller than 1 kΩ
Squareness, sharp and fast rise times are just desires. I'm sure people won't suggest an oscillator which is slow enough to turn a square into a triangle wave.