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2017-08-15 14:15  
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The unit has a separate amplifier and oscillator section allowing them to be used separately if need be. The injector is a multivibrator running at 1 kHz, with R5 andR6 dividing down the output to a suitable level (??1V). The tracer is a single-stage amplifier that drives the high impedance earpiece

C4 decouples the input.

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