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2014-11-27 09:07  
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Complete FM/TV 4.5 MHz sound channel using an ECG1045 14-pin DIP. Audio power output is 1.5 watts. The ECG1045 contains a three-state high-gain directional IF amplifier and a ratio detector. IF transformers and the AF output transformer are standard items and can be purchased at Radio Shack. This circuit can be modified for 10.7 MHz operation by selecting the proper IF transformers (courtesy GTE Sylvania Incorporated).