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LED_DISPLAY_FOR_TTL

2016-12-11 07:25  
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LED_DISPLAY_FOR_TTL
Useful for observing TTL levels when CRO is not available. A1 and A2 are 74123 dual retriggerable mono MVBRs with clear, used to tum on LEDs when input transitions are detected. Even very short pulses are made visible because mono stretches pulse length. Table shows how LED indications are interpreted.-B. Voight, The TTL One Shot, 73 Magazine, Feb,1977, p 56-58.