Eduk8Systems Electronics Kits, Transistor Switch/Amplifier Circuit - Class of 30 Sets

This transistor circuit includes a light sensor.,It can be configured so that the LED lights up in darkness or in bright light.,The light sensor could be swapped for a temperature/moisture sensor and the LED could be replaced with a buzzer or small motor.,Supplied with leads which terminate with battery studs.,Designed to be powered by a 9 volt battery (not supplied).