Electronic alarm system for car - is suitable for antitheft or engine monitoring using integrated circuits and three timers

摘要

The equipment for detecting malfunctioning of an IC engine consists of three timers operating on putting into use, alarm time, and delay for alarm. It can be used as an anti-theft device. The equipment uses integrated circuits of CMOS type with low impedance entries, not sensitive to dampness. The first timer is one minute, sufficient to operate doors. The second timer is 8 seconds and gives time to neutralise it. The third timer is 30 seconds giving an alarm, followed by an automatic stop. The timer is set in operation by a push button device, and uses a 12 volt supply with a 10 amp fuse.