SIGNAL_INJECTOR_TRACER

Published:2009/6/25 4:04:00 Author:Jessie | From:SeekIC

The injector is a CMOS oscillator with period approximately equal to 1.4 x C1 x R2 seconds. The values are given for 1 kHz opera-tion. Resistors R3 and R4 divide the output to 1 V. Whereas the oscillator employs the gates in their digital mode, the tracer used them in a linear fashion by applying negative feedback from output to input. They are used in much the same way as op amps. The circuit uses positiveground. It offers an advantage at the earphone output because one side of the earphone must be connected to ground via the case. Use of a positive ground allows the phone to be driven by the two N-channel transistors inside the CD4001 which are arranged in parallel and are thus able to handle more current for better volume.



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