In the schematic diagram of the motorcycle burglar alarm, a 555 integrated circuit is connected in the monostable timer circuit, which turns on the field effect transistor and the alarm or the bicycle horn for a predetermined period of time. The switch S1 is used as an on/off switch. Regardless of turning off either of the two switches, S2 and S3 will trigger the integrated circuit. When any one is turned off, pin 2 of the UI goes low. Motorcycle burglar alarm schematic:
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