A very simple but effective Short Sniffer (Continuity Tester).
Original idea & plan courtesy by Douglas Booth for the Nutsand Volts magazine, see below:
I have made a number of alterations to the original;
- replaced the large SMD N-Channel MOSFETS with simple TO-92 ones.
- changed the original value of 2MΩ for R16 to 1MoΩ as...
Just an SMD version of my project here: https://easyeda.com/Iam1CM69/continuity-tester.
I intend to manufacture a clear acrylic case for this board, basically a bottom & top sandwiching a clear centre gasket that'll retain the board. I'll post back images when I have made it.