universal logic probe using the popular LM393 and NE555 ICs. All the details including schematic, PCB design files and CAD files are available at <a href="http://jayakody2000lk.blogspot.com/2021/08/universal-logic-probe.html" rel="noreferrer nofollow">jayakody2000lk.blogspot.com/2021/08/universal-logic-probe...</a>
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