Logic Probe Memory Circuit - The Circuit describe is a low cost logic probe with memory with IC TTL 74107 Dual JK Flip Flop , Diode, resistor, and normaly closed switch provides the probe with memory function that really comes ih handy for "trapping" very fast pulse indications. See the circuit diagram. IC1 used TTL 7404. Used 5V adaptor/or battery.
reference : Popular Electronics May 1974
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