Build this Transistor based motorcycle alarm using cheap off-the-shelf components.
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This is a photograph of the transistor based Motorcycle Alarm No.7
. It can be operated manually using a key-switch or a hidden switch. Or it can also be wired to set itself automatically when you turn-off the ignition. The circuit has a 60 second siren cut-off timer - and the standby current is zero - so it won't drain your battery
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