This simple signal injector oscillator was found in a 1981 documentation. The coil can be made with a common ferrite rod consisting of 80 to 100 turns of enameled wire 28 with a central socket. The circuit can be supplied with voltages between 1.5 and 6 V according to the desired signal strength at the output. The terminal indicated as common in the circuit must be connected to the chassis of the device under test while the other terminal allows the application of the signal in the proper points of the circuit.
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