A very useful simple to build automatic solar garden light circuit that is able to serve as a night lamp for your garden or other places. The circuit is very easy to build using only one transistor and few other parts. In this circuit the 6V solar panel is working as a battery charger and also as a
dark detector, during the daytime it will charge the batteries and in night when it receives no light then the transistor BC547 will become switch on and activates the LEDs.
The circuit is using three 1.2 volt 2000mAh NiMH batteries and a 6V 200mA solar panel, which will completely charge the batteries in 10 hours therefore it is advised to point your solar panel in the direction where it will get sunlight all the day. The best idea is to set it top of your lamp in straight angle so it will receive maximum sunlight.