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Tape recorder remote control display circuit

2016-12-09 03:16  
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Tape recorder remote control display circuit
CC4082 is connected into positive feedback, it is coordinated with all kinds function switches, they form a trigger to ensure the output electrical signal against chattering. The later or gate or trigger simulates the work logic of tape recorder, the six LEDs indicate the six states of recording, putting, rewinding, fast marching, stopping, time-out. CC4013 drives LED directly, the limited current is 4~5mA. To choose Q terminal to drive LED, because the Q terminal is unrelated to logic state. If the output voltage drops, it has no influence on Q terminal logic state.