Logic test probe with memory

  
There are two switches: a memory disable switch and a pulse polarity switch. Memory disable is a push-button that resets the memory to the low state when depressed. Pulse polarity is a toggle switch that selects whether the probe responds to a high-level or pulse (+5 V) or a low-level or pulse (ground)
Logic test probe with memory - schematic

(Use IC logic of the same type as is being tested).




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