Autonomous car siren
Encyclopedia of radio electronics and electrical engineering /
Automobile. Security devices and alarms
Comments on the article
The scheme was torn off from a product of an unknown manufacturer at the time of restoration. The siren was wet in the water for about a day (along with the car), and apart from the control circuit, nothing burned out. Because element base of the enemy, then I carefully copied all the icons from the cases.
Control scheme
Black and red - it is clear this food. Blue and white - generator control. As long as the voltage level is high on white, the generator is working. Those. white - siren control by high voltage level. If the blue voltage level is low, then T7 opens and the generator is working again. Those. blue - siren low voltage control.
T7..........A733
D1,D3,D4 ...... 4002
D2 .......... 15393
C1......... 100 mF
C2.......... 1000 pF
R2,R5,R6 ....... 1 kHom
R3,R4 ....... 2.2 kHom
R1..........410Hom
What I don’t like in this scheme is that through R2, completely useless for the siren, the native planet is constantly heated.
Generator
Well, there is nothing to say here - a specialized microcircuit with a supply voltage stabilization circuit. You can do any other, BUT in the absence of triggering signals at the outputs of the generator (on both), there must be low voltage levels, otherwise the ULF will be very bad.
DD1......... JL-01/591L5144/9909
D5 .......... Zener diode 3V
C3.......... 1000pF
C4.......... 10000pF
R9......... 100 kHom
R12......... 4.1 kHom
ULF
I don't think there should be any problem here.
Loudspeaker winding resistance - 6 Hom
T1,T4.........H/882/9CT
T2,T3.........H/772/8LT
T5,T6..........C945
R7,R8..........100Hom 0,5Wt
R10,R11..........1 kHom
Author: Dmitry; Publication: cxem.net
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Automobile. Security devices and alarms
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