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Tap Moving-Direction Display Circuit Diagram

2016-12-19 17:29  
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Tap Moving-Direction Display Circuit Diagram
The above picture is a tap moving direction display circuit. The circuit is composed of micropulser, D trigger (T077), decoding circuit, and luminous diodes LED1~LED4 etc. Micropulse iscomposed of 4 NAND gates from YF1 to YF4, with output signal frequency between 1 and 3 Hz. The frequency can be adjusted by changing the value of C1 and R1.Decoding circuit is composed of 4 NAND gates from YF5 to YF8. It’s output signal control the displaying of luminous diode, so that when the recorder works, light is given out from LED1 to LED4 in succession to indicate the direction the tape moves.