Electric OU: Supplement: 1000uF Cap w/Resistor at 9V Runs LED Long Time

No Joule Thief needed, if all you are concerned about is keeping an LED or two just barely lit for a long time.

Parts count: 3
Coils: none
Transistor: none
Operating Frequency: DC
Capacitor: 1000 uF, rated more than 9V
Resistor: 22K (use 47K for even longer running)
LED: Red
Power source: momentary contact with 9V alkaline battery

You may also like...