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Here is my design for a DIY timing light after wasting hundreds of dollars buying different ones, none of which worked. I know the wire around the spark plug wire is without return connection to the circuit but it works by picking up electrostatic energy which uses air as return loop. This only works when it is dark as the light is not strong. But it works great.  The circuit commons all tie together. Not shown is the DC jack which is between the 12 volt supply and the circuit. Make sure you wire it so the positive voltage goes to the four LED's. LED Timing Light Parts List parts source: www.mouser.com 4 white light LEDs 859-LTW-2S3D7 $.64 each 1 637-1N4001 diode 1N4001 $.23 each 1 5.1v zener diode 610-1N751A $.46 1 2N7000 FET 512-2N7000 $.51 1 10 ohm resistor 660-MF1/2LCT528R100J $.32 1 1.8K resistor 303-CFR0W4J0104B00 $.10 1 100K resistor 660-CF1/4CT52R104J $.05 1 .01uf capacitor 581-SR155C103KAATR1 $.41 1 12 volt regulated supply 374-T6639ST $6.42 1 2.1/5.5mm jack 992-CON-SOCJ-2155 $1.00  The 12 volt supply can be replaced with 9v volt battery but the strobe light strength will be dimmer. |