Battery

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Three-way Switch or How To Turn a Light On or Off From Either End of A Long Hallway Regardless Of The Position Of The Other Switch.
Lamp Battery Switch
6860
24 Dec 2014
Sam Watson
fuse
Lamp Fuse Transistor Battery Resistor
2267
29 Nov 2014
khawar mushtaq
Double Throw Double Pole Switch (DPDT)
Double Throw Double Pole Switch (DPDT)
Lamp Fan Battery Switch
5931
16 Jul 2014
Samir Sabri.
Using 'bucking' batteries: The voltage of the smaller battery is subtracted from the larger battery and the positive end of the smaller battery becomes the negative end of the two. This really works.
Lamp Diode Battery
4847
10 Jul 2014
Sam Watson
Quick but unregulated split power supply.
Battery
3606
02 Jul 2014
Sam Watson
6 Volt Lamp Flasher
Lamp Transistor Battery Resistor Capacitor
4785
12 Jun 2014
Sam Watson
Simple Fan connected
Simple Fan connected
Fan Battery Switch
7480
04 May 2014
Samir Sabri.