20100407_SolarElectronicProject4
The circuit diagram for the solar-powered night light I made recently. Thanks to www.evilmadscientist.com et. al.
Some notes about the components.
D1 is a generic signal diode, which prevents the capacitor from discharging through the solar cell. I use some re-cycled parts in my projects - this came from a faulty power supply.
T1 is a PNP transistor, the type isn't critical. They are less common than the NPN types.
The 100R resistor limits the current to the joule thief.
T2 is an NPN type transistor, again it is not critical which you use. I've found most compact fluorescent lamps have at least one NPN transistor which can be harvested after the lamp fails.
The inductor needs to be hand-made, the ferrite ring also came from an old CFL.
D2 is a white LED.
20100407_SolarElectronicProject4
The circuit diagram for the solar-powered night light I made recently. Thanks to www.evilmadscientist.com et. al.
Some notes about the components.
D1 is a generic signal diode, which prevents the capacitor from discharging through the solar cell. I use some re-cycled parts in my projects - this came from a faulty power supply.
T1 is a PNP transistor, the type isn't critical. They are less common than the NPN types.
The 100R resistor limits the current to the joule thief.
T2 is an NPN type transistor, again it is not critical which you use. I've found most compact fluorescent lamps have at least one NPN transistor which can be harvested after the lamp fails.
The inductor needs to be hand-made, the ferrite ring also came from an old CFL.
D2 is a white LED.