Gasboss775
Member
I seen something like this online and decided just to try it out. Was surprised that it is fairly linear. Not up to the standard of say an lm331 but for such a simple circuit pretty good. Also the sawtooth waveform ( descending ramp ) is also pretty linear over the full range of the vco. By adding a monostable to the pulse output you could get voltage controlled pwm. I expect it would drift with temperature, though there are probably ways of compensating for that, but that would be contrary to the principal appeal of the circuit, that it is very simple!