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Houseplant buzzer

Based on a Labs project | October 2011 | Find it here
Houseplant buzzer
The circuit based on transistors T1 and T2 forms a rectangular-wave generator. The values of resistors R2 and R3 and of capa citors Cl and C2 ensure that the generatot produces a reetangular voltage at a frequency of about 3 kHz.
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