Dc lamp dimmer

Posted on Nov 15, 2012

A low power, low cost dc lamp dimmer for a two-wire portable `flashlight` can be realized with little or no heatsinking. In addition, a single potentiometer, R3 adjusts lamp brightness. Battery power is stored in Cl for Ul, which is a free-running multivibrator whose frequency is determined by Rl, R2, R3, R4, and C2.

Dc lamp dimmer
Click here to download the full size of the above Circuit.

Ul drives the gate of Ql, turning it and the lamp ON and OFF at a rate proportional to the multivibrator duty cycle.

Leave Comment

characters left:

New Circuits



Popular Circuits

1.2GHz Voltage Controlled Oscillator With Linear Modulation
push puppet toy
low voltage cutout for 12v sla
Record audio with the MSP430 microcontroller
Operation of an Armstrong Oscillator
1B32 bridge sensor signal conditioner with multi-channel application circuit when the pressure sensor
A plurality of sets of three loop flashing lights chain circuits
Sawtooth generator circuit a
By the driving capacitive loads MAX4223 ~ MAX4228 circuit diagram