This is a circuit for testing instrument provides two alternate functions: signal injector and signal tracer. This circuit is very helpful in trouble shooting audio circuits, when you need to test a circuit by injecting a signal and observe the output (by watching the oscilloscope or by hearing the loudspeaker for example), or by tracing some points inside the circuit when an audio signal is applied to the input. This is the figure of the circuit;
This signal tracer/injector uses 9 volts supply from battery. An alligator clip is recommended for the ground probe, so you can works with one hand to hold the board, and the other hand to target the test probe. The SPDT switch connected to the transistor and the earpiece is used to select the function, whether as a signal injector or a signal tracer.
This signal tracer/injector uses 9 volts supply from battery. An alligator clip is recommended for the ground probe, so you can works with one hand to hold the board, and the other hand to target the test probe. The SPDT switch connected to the transistor and the earpiece is used to select the function, whether as a signal injector or a signal tracer.
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