electronic whistle circuit
Source: InternetPublisher:张七岁 Keywords: Power supply other power circuits Updated: 2021/01/06
As shown in the figure is a double T-shaped oscillator. R1 controls the pitch, R2 controls the duration, and R3 controls the specifications (bell shape, rise and fall time, etc.). Changing R4, R5, C4, C2 and C3 can cause large phase shifts in frequency.
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