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LED display TTL level circuit

2016-12-09 00:51  
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LED display TTL level circuit
When there is no cathode ray oscillograph, you can use this circuit to observe TTL level. 74123 integrated circuit contains two retrigger monostable multivibrators with reset input terminals, they are marked for A1 and A2. When the input level changes, LED is lighted up by two monostable multivibrators. Because monostable delays pulse width, so, even the input pulse is narrow, the naked eye still can distinguish the light and dark change of LED. The attached list explains the meaning of three LEDS in various point.