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IC1a is a fast oscillator, and IC1b a sluggish oscillator, which are combined through IC1c to emit a higher pippippip warning sound if your gate (or window, etc.) is opened. The circuit is meant not so much to sound like a siren or warning device, but alternatively to give the impression: "You have been completely noticed." R1 and D1 could possibly be omitted, and also value of R2 perhaps reduced, to help make the Gate Alarm sound more like a warning device. VR1 adjusts the frequency of the sound emitted...
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