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2014-11-16 16:35  
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TV AFT/AFC circuit for three types of systems using an ECG1046 14-pin DIP. The ECG1046 contains two VIF differential amplifiers, a phase detector, and a DC amplifier, whose output is supplied to a varactor diode in a tuner. It has the additional feature of having an internal regulated voltage supply. Partial tuner circuits shown are only for example applications. Coils and transformers should be selected to match the IF and can be obtained from discarded TV receivers or purchased at a local electronics parts jobber (Merit or Miller components). Maximum supply voltage for the ECG1046 is 20 volts (courtesy GTE Sylvania Incorporated).