WIRELESS_IR_HEADPHONE_TRANSMITTER

Published:2009/6/19 4:04:00 Author:May | From:SeekIC

Audio input from PL1 frequency modulates the VCO section of a 4046 PLL chip. The VCO out-put drives Q1, a switching transistor. Q1 drives two IR LEDs. The signal produced is around 100 kHz, FM carrier VCO sensitivity is around 7.5 kHz/V.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Measuring_and_Test_Circuit/WIRELESS_IR_HEADPHONE_TRANSMITTER.html

Print this Page | Comments | Reading(3)