Infrared reflective electronic doorbell circuit diagram

Published:2011/8/22 3:20:00 Author:Ecco | Keyword: Infrared reflective , electronic doorbell | From:SeekIC

Infrared reflective electronic doorbell circuit is composed of the infrared transmitter, infrared receiver circuit, low-frequency oscillator, audio oscillator and audio output circuit, and it is shown in Figure 1. IC1 uses LM567 integrated circuit; IC2 uses CD4.001 or TC4001 4-2 input NOR gate integrated circuit. VTl and VT2 select the silicon NPN transistors. VLl and VTL select the matching infrared emitting diode and phototransistor red external board. VL2 uses the Φ5mm red high-brightness light-emitting diode. R1-R8 select the 1/4W carbon film resistors. RP chooses the membrane variable potentiometer.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Infrared_reflective_electronic_doorbell_circuit_diagram.html

Print this Page | Comments | Reading(3)