A TTL Logic ProbeThis circuit is a simple TTL Logic Probe. It used to indicate the logic state of the node of any TTL logic circuit.The circuit use small components count.It justĀ needĀ 1x74LS00 , 1x74LS47 , 1×7-Segment,2xLEDs and some of passive components.

A TTL Logic Probe
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A TTL Logic Probe
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