This circuit is intended to trick car burglars into believing that your car is equipped with some highly sophisticated alarm system. The circuit flashes an LED at a very high intensity, and this LED, accompanied by a few warning stickers is enough a reason to deter a burglar from attempting to break into your car fearing that it would set off an alarm.
The circuit, unlike other complex ones, uses just one single CMOS IC, probably The most common in the 40xx family, type 4093. The first gate is used as a short pulse oscillator, followed by the remaining gates which increase the current drive by acting as parallel buffers. The frequency is set by C1 AND R1. The diodes are used to help in disabling the circuit when the vehicle is started, and vice versa.
The circuit is powered directly from the battery. The circuit is switched off when the car ignition is turned on. The LED may be fitted on the dashboard, preferably with a silver holder which increases its brightness.
Finally, it would be a good idea to put a few stickers warning the presence of an alarm system outside, on the door.
The circuit, unlike other complex ones, uses just one single CMOS IC, probably The most common in the 40xx family, type 4093. The first gate is used as a short pulse oscillator, followed by the remaining gates which increase the current drive by acting as parallel buffers. The frequency is set by C1 AND R1. The diodes are used to help in disabling the circuit when the vehicle is started, and vice versa.
The circuit is powered directly from the battery. The circuit is switched off when the car ignition is turned on. The LED may be fitted on the dashboard, preferably with a silver holder which increases its brightness.
Finally, it would be a good idea to put a few stickers warning the presence of an alarm system outside, on the door.
The deceptive car alarm uses just one chip
