Build this transistor based 12-volt or 6-volt motorcycle alarm using cheap off-the-shelf components.
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Motorcycle Alarm No.4 - Photograph

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This is a photograph of the transistor based Motorcycle Alarm No.4. The circuit features a timed output and automatic reset. It can be operated manually using a key-switch or a hidden switch. By adding an external relay - it will set itself automatically every time you turn-off the ignition. It's easily adapted for a 6-volt system - so it will protect your "Classic Bike". And - because its standby current is zero - it won't drain your battery.
A Photograph Of Ron J's Transistor Based
Motorcycle Alarm No.4 - Circuit Board


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