A Driving Circuit For Driving LED

Published:2011/5/18 21:47:00 Author:Robert | Keyword: Driving, LED | From:SeekIC

This circuit converts the single port's input signal to balanced differential driving signal and then this signal is send to 75Ω transmission line. The line's other port is connected to LED which is used as the input of optical coupling receiver. The phase reverser A changes the logic 1 to be logic 0 to make the Q1 connected and make B's output be 1. And the Q2 is disconnected and D's output becomes 0. So the logic 1 means that the Q2 borrows current from the transmission line and the LED and then the door D's output port absorbs the current. Or, Q2 would lend current to the transmission line and B absorbs the current, then D1 is connected to make the optical coupling receiver OC1's LED disconnected.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/LED_and_Light_Circuit/A_Driving_Circuit_For_Driving_LED.html

Print this Page | Comments | Reading(3)