TOUCH_TONE_DRIVE_FOR_LOUDSPEAKER

Published:2009/7/14 8:25:00 Author:May | From:SeekIC

Encoder is held In front of microphone to access and use autopatch of repeater, Acoustic coupling eliminates need for opening new transceiver to make wire connections, which would void guarantee Uses Motorola MC14410P IC with KB1 keyboard (Polypaks 92CU3149). Q1 and Q2 are 2N3643 or equivalent Y1 IS 1,000 MHz crystal (Mariann Labs ML18P or Sherold Crystal HC-6) Transistors Q1 and Q2 boost out-put enough to drive 8-ohm loudspeaker Total current drain is 35 mA idling and 100 mA with full drive.-C. Gorski, A Low-Cost Touch-Tone Encoder, QST, Oct 1976, p 36-37.



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