Tape_recorder_position_indicator_controller_using_an_ICM7217A_28_pin_DIP

Published:2009/7/21 21:23:00 Author:Jessie | From:SeekIC

Tape recorder position indicator/controller using an ICM7217A 28-pin DIP. This circuit employs the up/down feature of the ICM7217 to keep track of the tape position. The not-equal and not-zero outputs can be used to control the recorder. To make the recorder stop at a particular point on the tape, the register can be set with the stop point and the equal output used to stop the recorder, either on fast forward, play or rewind. To have the recorder stop before the tape comes free of the reel on rewind a leader should be used. Resetting the counter at the starting point of the tape a few feet from the end of the leader allows the zero output to be used to stop the recorder on rewind. The 1 M resistor and 0.0047μF capacitor on the count input provides a time constant of about 5 ms to debounce the reel switch (courtesy Intersil, Inc.).



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