We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The components used are still common.
This is the traditional configuration for a limit comparator or window comparator, using two...
In the figure we show how to add a 100k ohms potentiometer to implement an oscillator controlled by this...
This circuit uses one of two D-type flip-flops available on an integrated circuit 4013. The...