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

Model Railroad Group SCR Throttle
Audio-controlled lamp
Simple Absolute Value Circuit
100W inverter 12V to 220VAC
digital thermometer with pic16f84
STI7167 Advanced STB Decoder With Integrated DVB-T/DVB-C Demodulator
filtering noisy power signal
Complete SS Laser Power Supply Schematics
ZKJ-S-type buffer controller circuit
Pocket-sized device to help Xin
FS810 integrated power amplifier circuit diagram



Top