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SOUND_SUBCARRIER_GENERATOR

2017-01-18 10:12  
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SOUND_SUBCARRIER_GENERATOR
SOUND_SUBCARRIER_GENERATOR
SOUND_SUBCARRIER_GENERATOR
This circuit will generate an FM sound subcarrier at 4.5 or 10.7 MHz for FM and TV IF testing and alignment. Q1 is an audio amplifier and Q2 is a VCO rrtodulated by an MV2112 varactor. Devia-tion up to 1% of frequency can be obtained. L is chosen to resonate with the circuit capacitance to either 4.5 or 10.7 MHz. The values will be around 2 to 10 pH, depending on the frequency.