Optical communication system


Posted on Nov 4, 2012

The simple modulator stage will accommodate most common LEDs. By adjusting the potentiometer, the bias of the transistor is varied until the LED is at its half output point. Then, audio will cause it to vary above and below this point


Optical communication system
Click here to download the full size of the above Circuit.

The purpose of Rl is to limit the current through the LED to a safe level and the purpose of the 10 ohm resistor is to allow a portion of the modulating signal to be observed on a scope.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Pushpull Amp
Cellular Phone Detector
Led indicates logic states
On-off controller
Multiple-input-detector
Charger Extends Lead-Acid Battery Life
Centrifugal fish autofeeder
Automatic Light Controller Using 7806 And LDR PCB
Dual Polarity Power Supply
PWM Dimmer/Motor Speed Controller
N1FN Key Collection
ECM Mic Preamplifier



Top