Simple Signal Injector Circuit Diagram using 555

This is a Simple Signal Injector Circuit Diagram. The unit provides a square-wave output that is rich in harmonic content. The circuit`s output frequency can be varied from 50 Hz to 15 kHz. The heart of the circuit is a 555 a stable connected in its equal mark/space mode. The frequency is controlled by potentiometer R2 and capacitor Cl. Resistor R3 controls the output level with the output ac-coupled through C3.


Simple Signal Injector Circuit Diagram