Parts List-
R1 - 1 - 1K 1/4W Resistor
D1 - 1 - Green LED
D2 - 1 - Red LED
D4, D5, D6, D7 - 4 - 1N4001 Silicon Diode
MISC - 1 - Board, Wire, Case, Probes
Notes-
1. Email Dudley LeRoux with questions, comments, etc.
2. To use the circuit, just connect your probes to the source under test. If D1 lights up, the left most probe (on the schematic) is connected to positive. The opposite is true if the left probe is negative. If both LEDs are on, the source being probed is AC.
3. Be careful when using this tester not to probe a source greater than about 12V.
