Build this transistor based 12-volt or 6-volt motorcycle alarm using cheap off-the-shelf components.
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Motorcycle Alarm No.1 - Photograph

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This is a photograph of the transistor based Motorcycle Alarm No.1. The circuit features a timed output and automatic reset. It can be operated manually using a key-switch or a hidden switch. But add a small external relay and the alarm will set itself automatically - every time you turn-off the ignition. It's easily adapted to a 6-volt system - so it will protect your "Classic Bike". And the standby current is zero - so it won't drain your battery.
A Photograph Of Ron J's Transistor Based
Motorcycle Alarm No.1 - Circuit Board


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