Circuit Of Car Audio Speaker

Published:2011/4/20 9:05:00 Author:TaoXi | Keyword: Car Audio | From:SeekIC

The figure shows the circuit of car audio speaker. The left of dotted line is the circuit of original electric speaker, Sl means the electric speaker button switch on the steering wheel. S2 is the additional SPDT, for the switch between the original car electric horn and voice horn. When the switch S2 set to 2 , press the switch Sl, capacitor Cl is charged, transistor VTl, VT2 conducted, relay Jl picked, its normally open contact point J1-1 closed for 15 seconds to supply power to the circuit. ICl is designed as the dedicated voice circuits HL-169A, because of its working time is 2.8 seconds, so use the transistor VT3, VT4 to form the self-excited multivibrator, export a high level as a trigger signal per three seconds, this makes ICl export a voice signal per three seconds, transports into IC2 to enlarge the audio power, at last speaker BL issues the voice.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Audio_Circuit/Circuit_Of_Car_Audio_Speaker.html

Print this Page | Comments | Reading(3)