| 摘要 |
The bird-scarer has a gun (1) with an explosion chamber (2) at one end, which is connected to a bottle of gas (8) and to an igniter which triggers detonation in the chamber. Delivery of gas is controlled by a solenoid valve, which is controlled by the same timer that controls the igniter. The unit is powered by a battery or by a solar panel (15), and timing is provided by a clock and capacitor.
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