Tone Doorbell circuit

Published:2012/9/11 21:14:00 Author:Ecco | Keyword: Tone Doorbell | From:SeekIC

When the door is pushed, you hear a whisper that slide up to a higher frequency. The oscillator frequency is determined by AF coupling capacitance, C 1 and the value of the resistor connected between the base of IQ and the earth. This resistance, RBG is equal to (Ri + R2) RJ. First, suppose that 51 is closed and R2 have been adjusted to produce a pleasant, low frequency tone. The capacitor C3 charges through R6 until it reaches such a tension that will cause diode Dl to conduct.



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