Circuit Simulator - Sawtooth Wave Generator

Can somebody explain what types of AO are in the circuit and what power supply it needs?

I try it. And the circuit doesn't work. My output just jump on maximum voltage level.

I tried with different voltage dividers answer still doesn't work.

Multivibrator needs no input.

Works only with dual power supply op amps. If you have a single supply op amp you need to modify the positive input of second op amp (and maybe the negative input of first op amp as well).

I have tried with LM358 opamp with single power supply by adding virtual zero point. Worked well. Added another opamp and a pot to produce variable PWM signal.

Lots of people seem to be having problems with this circuit. I assure you that with sensible op amps and component values it works perfectly. For those that have tried and failed are you using a split supply for your op amp (ie +/- Vcc)? If you are using a single supply then the grounded inputs to the op amp need to be connected to a mid supply voltage, easily established by two 10K resistors.

Use an op amp with rail to rail output for maximum ramp voltage. For those that have asked for how the circuit works the RH op amp is an integrator. The LH op amp is a Schmitt trigger with hysteresis from the positive feed back to reset the integrator. The circuit is readily adjusted to alter both the ramp frequency, the ramp amplitude, and the ramp average voltage. Note that as drawn the 5K resistor and the diode connected to the 40K resistor are not actually required.