TV Modul½±tor

Posted on Apr 1, 2013

This circuit uses an MC1373 to form a TV video modulator. The coil and capacitor connected between pins 1 and 2 should be selected to have a parallel resonance at the carrier frequency of the desired TV channel.

TV Modul½±tor
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The values of 56pf and 0.1uH were chosen for channel 4 carrier frequency of 67.25 MHz. For channel 3 operation, the resonant frequency should be 61.25 MHz (C=75pF, L=0.1uF). Resistors R2 and R3 are chosen to provide an adequate amplitude of switching vo

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