This circuit for controlling high power LEDs (up to 2A) is from a General Electric documentation from 1970. The circuit serves to modulate a transmitter in PWM. The circuit serves as a shield.
The presence of a low resistance between the terminals of the sensor causes this modulated...
TDK provides a wide range of EPCOS varistors for surge protection through Mouser Electronics....
This circuit was taken from a Popular Electronics from January 1967. Transistors are from the...