Automatic dimming table lamp

摘要: The invention provides an automatic dimming table lamp. lamp is composed of a 220V alternating current power supply, full-bridge rectifying circuit, 9V voltage stabilizing light-sensitive optical signal amplification bidirectional thyristor trigger circuit and control characterized in that the type unijunction transistor VT2 BT33. According to provided by invention, resistor placed proper position lamp, intensity illumination around can be automatically adjusted value, thereby reducing trouble manual protecting eyesight students. Simultaneously, also has function light brightness, thus when fluctuates, brightness kept unchanged. changed only changing distance between bulb being very convenient use. suitable for factories develop novel with controlling illumination.