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Car alarm horn Beep eliminator principle of armed

2016-02-18 10:07  
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This article describes a car alarm is armed corner Beep eliminator works. The principle is simple there, we recommend that combine text carefully read the complete schematic. Figure: This circuit is used to silence the alarm armed beep however maintenance by introducing a small delay to the signal. It is located in the alarm and  horn relay . Must provide a constant angular clock signal for at least 3 seconds, then horn relay is activated. Such rapid "beep" will never activate the horn relay, while the constant alarm signal will be. Read more times, is conducive to a better grasp of this principle.

Schematic

Schematic  for Car Alarm Arming Horn Beep Canceller

Parts

PartTotal Qty.DescriptionSubstitutions
C110.01uF Ceramic Disc Capacitor 
C21100uF 35V Electrolytic Capacitor 
R111K 1/4W Resistor 
R2110K 1/4W Resistor 
R3115K 1/4W Resistor 
R41470 Ohm 1/4W Resistor 
D1, D3, D431N4004 Rectifier Diode 
D21Red LED 
U11555 Timer IC 
K11SPST 12V Automotive Relay 
MISC1Board, Wire, Socket For U1, Case 
VN:F [1.6.9_936]

 


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