AURAL_INDICATOR

Published:2009/6/30 1:36:00 Author:May | From:SeekIC

Provides attention-getting chirp sound, warble, or continuous tone when turned on by high input from burglaralarm sensor circuit. Second section of 556 timer provides optional frequency modulation of basic tone to give warbling effect. Chirp is achieved by gating tone oscillator on only during high states of warble oscillator. Aural sensitivity is maximum in range of 1-2 kHz, set by value of Rt2.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 232-235.



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

Print this Page | Comments | Reading(3)