Discrete sound and light control stairs delay switch circuit(1)

Published:2011/6/29 20:19:00 Author:Ecco | Keyword: Discrete , sound , light , control , stairs, delay switch | From:SeekIC

Features: during the day, lights are automatically blocked off; in the evening, as long as someone on the stairs, the lights are lit and turned off in tens of seconds delay time. Circuit uses the two-wire system connection, and the switch only has two outside terminals, which can replace the ordinary switch without having to change the existing lighting circuit. In the figure, RL can select MG44, MG45 photosensitive resistors with great difference between light resistance and dark resistance; B should use small electret condenser microphone with higher sensitivity, such as CRZ2-113F type.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Discrete_sound_and_light_control_stairs_delay_switch_circuit1.html

Print this Page | Comments | Reading(3)