DC_LAMP_DIMMER

Published:2009/7/14 12:16:00 Author:May | From:SeekIC

The dc lamp dimmer circuit will adjust the brightness of a dc lamp or the speed of a suitable dc motor. An oscillator is formed around Schmitt inverter IC1a, and is buffered by IC1b. This, in turn, drives TR1, which is a Darlington power transistor. The lamp LP1 forms the collector (c) load for the transistor, and this is driven at a nominal 330 Hz. The duty cycle is, however, fully variable using potentiometer VR1. Consequently, the power delivered to the load can be controlled between 5 and 95 percent, approximately. No flicker will be apparent at this frequency. The circuit consumes little power itself and is ideal for controlling car instrument panel lights.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/DC_LAMP_DIMMER.html

Print this Page | Comments | Reading(3)