Build this 555 based 12-volt or 6-volt motorcycle alarm using cheap off-the-shelf components.
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Motorcycle Alarm No.2 - Photograph

Free Circuit

Simulation

Circuit Board

This is a photograph of the NE555N based Motorcycle Alarm No.2. The circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch - but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike - flash the lights etc. The standby current is zero - so it won't drain your battery
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