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The circuit diagram of TTL level displayed by LED

2016-12-04 08:43  
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The circuit diagram of TTL level displayed by LED
This circuitry could be used to observe the TTL electrical level when there's no cathode-ray oscillograph . 74123 integrated circuit contains two trigger type of monostable harmonic oscillators with input of zero clearing, and they are marked as A1 andA2 in this circuit respectively. When the input level changes, the tmonostable harmonic oscillator will light more light emitting diode. Because single firm extended the pulse width, even if the input brain is very narrow, naked eye can still arguing the brightness of diode. The exhibit explains three light-emitting diodes mean of different states.