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Direction Displayer of Tape Movement

2016-12-05 02:34  
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Direction Displayer of Tape Movement
As shown in the figure is a direction display circuit of tape movement. The circuit is composed of rectangular pulse generator, D flip-flop (T077), decode circuit, light emitting diodes LED1 ~ LED4 etc. The rectangular pulse generator is composed of NAND gates YF1 ~ YF4, and its output signal frequency is 1 ~ 3 Hz, which can be changed by adjusting the value of C1, R1. T077 is connected in a state of counting, which will dichotomise the signal output by the rectangular pulse generator. The decode circuit constitutes of NAND gates YF5 ~ YF8, and its output signal will control the display of the led.