The objective here is to build a a light that switched on by itself when the surroundings gets dark and back off when its bright, this can be used as…

The gadget provides you with metering of both voltage across the battery being charged as well as the charging current

The objective here is to build a dual power supply that generates regulated +12 volts and -12 volts from AC mains.

a simple music bell using ic -UM66, you can use it as door bell or in any of your projects accoding to the need.