This circuit allows you to vary the duty cycle without changing the frequency. An interesting application for PWM controls. The circuit is from a Radio Electronics magazine from July 1985.
This circuit was found in a 1968 documentation. The circuit generates three rectangular signals...
We found this circuit in an old documentation from the 70s. The circuit can use any varicap and...
Found in American documentation from the 90's, this circuit is very current and can be implemented with...