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

Simple Electric Field Detector
Vacuum fluorescent display
Free Running Oscillator Circuit
Load Cell with an Arduino
jet engine sound generator
remote control mains switch
vhfuhf tv modulator
Active Shortwave Antenna PCB
ADUC841 20MIPS 8052 Flash MCU + 8-Ch 12-Bit ADC + Dual 12-Bit DAC
Network Bandwidth Meter
555 tri-state acousto-optical logic circuit
Relay control circuit
Delta connection Motor phase protection circuit



Top