Logic Probe This design uses a single Schottky Hex Inverter (74LS04) and is ideal as a school project as it is fairly simple to make and understand. Attach the power leads to some crocodile clips and use a sharpened nail for a probe point (solder a few hoops of wire to hold it to the PCB) and away it you go. http://users.netconnect.com.au/~robw/Robotics/logicprobe.htm
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