Tone Doorbell circuit
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.
Datasheet file1: Click here to download 2N5219.pdf datasheet.
Datasheet file2: Click here to download 2n5226.pdf datasheet.
Datasheet file3: Click here to download 1N417.pdf datasheet.
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