Lighted-display-brightness-control


Posted on Sep 1, 2012

This circuit provides a very low cost method of controlling light levels. Circuit power is obtained from a relatively high source impedance transformer or motor windings, normally used to drive the low-voltage lamps used in these functions. It should be noted that the bias resistors are optimized for the 20-V, 30-0 source, and they must be recalculated for other sources.


Lighted-display-brightness-control
Click here to download the full size of the above Circuit.

The Ll4Rl is placed to receive the same ambient illumination as the display and should be shielded from the light of the display lamps. The illumination level of lighted displays should be lowered as the room ambient light dims, to avoid undesirable or unpleasant visual effects.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Regulator L200 schematics
Touch triggered bistable
Low voltage flasher
Duty-Cycle Measurer
lm12 audio amplifier circuit diagram
QPSK Demodulator Is A Good Match For Low-Cost Modulator
power window 3 prong safety relay
agriculture based robot e project
Controlling a LED using a switch
Sawtooth generator circuit
Module Project Template
Voltage-controlled voltage source second order band-pass filter circuit



Top