Electronic telephone ring circuit
Source: InternetPublisher:刘德华河北分华 Keywords: Power supply other power circuits Updated: 2020/11/20
When a ring pulse is applied to the phone line, this speaker produces a distinctive bird chirping sound. This circuit can be used directly as a remote ringer or as a ringer for connected phones. R1 adjusts the saving time of the output, and R2 and R3 control the duty cycle and frequency of the tone.
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