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.
The control of the triac in this power flasher for incandescent lamps is made by a relaxation...
We found this amplifier in a 1990 documentation. The transistors are common, having been made...
The circuit shown is from the Motorola Linear Databook of 1990. In the example, the components are for the...