Signal Injector is a compact electronic test instrument used for troubleshooting and testing electronic circuits by injecting a known test signal into different stages of a circuit. It helps technicians and students quickly locate faulty components or defective sections by introducing a signal and observing how the circuit responds.
The device generates a stable audio or pulse signal that can be applied to various points within an electronic circuit such as amplifiers, radios, audio systems, and communication equipment. When the injected signal passes through the circuit stages, it can be detected using a speaker, oscilloscope, or signal tracer.
Signal injectors are widely used in electronics laboratories, service centers, and training institutions because they simplify the process of circuit testing and fault diagnosis.