The squib is an element of the active protection of the car. Free Technical Library article

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Igniter - an element of active car security

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Encyclopedia of radio electronics and electrical engineering / Automobile. Security devices and alarms

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As a rule, most security systems do not ensure the complete safety of the car, but simply passively prevent the attacker from carrying out his plan. At the same time, the task is to draw the attention of surrounding people or the owner to attempts to penetrate the interior of an outsider or other actions of a thief with the help of a siren. If during the day it still sometimes frightens the hijacker, then at night the owner can sleep soundly and not hear the beep - after all, thieves turn it off in the first place. In this case, it may be useful to use a squib as part of a burglar alarm. This is a one-time device and, in addition to the noise effect, can provide tear gas in the car interior. When the squib in the cab is triggered, no one will be able to use the car for the next 10 ... 15 minutes.

I did not manage to buy an industrial-made squib specially designed for burglar alarms (although they exist). For this reason, I had to start making it myself.

A variant of a simple design for making a squib is shown in Fig. 1 (view without casing). It is based on a cartridge (9 mm in diameter with tear gas or noise action) from any non-drum type gas pistol.

The squib is an element of the active protection of the car. Design

Rice. 1. Type of construction (click to enlarge)

A cartridge is fixed between the two walls in the recess. Its base is covered with thin mica, on which 20 ... 23 turns of nichrome wire with a diameter of 0,5 mm are tightly wound. The top winding is covered with an asbestos layer. The terminals of the nichrome heater are clamped with stud nuts. The walls are made of thick fiberglass or any other heat-resistant and durable dielectric. A drawing of the front wall is shown in the figure. The rear wall differs from the front only in the absence of a through hole in the recess for attaching the cartridge. On the walls with M3x5 screws, a casing bent from a thin metal foil according to the dimensions of the frame is attached.

Such a device can be installed in the circuit shown in Fig. 2 instead of or in parallel with the horn. When connecting the squib to any other alarm system, it is desirable to provide for a limitation of the heater winding operation time by an interval of 30 ... 40 s, which will eliminate the waste of battery power. To trigger the squib, it is enough to supply the heater for 6...9 s. For this, a timer circuit can be used, assembled according to any of the two shown in Fig. 2 options. When the heater is turned on (Rn) through the timer circuit, the time during which power will be supplied to it is set by the values of the elements C1 and R1.

The squib is an element of the active protection of the car. Scheme

Rice. 2. Electrical diagram of the timer (click to enlarge)

Compared to automatic tear gas canisters, this one is smaller and simpler in design.

Publication: cxem.net

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