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Detect ringing signal tone with light and sound

2014-12-22 16:43  
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The detect ringing signal tone circuit with light and sound.It is easy to use and good quality, Do not enter the power supply. Which as Detect ringing signal tone circuit Or ring tones on the telephone line, a signal incoming calls.
When an incoming call,When an incoming call, The C1, C2, will act as a coupling signal AC Volt to diodes D1, D2.Signal voltage is reduced down to approximately 10V.By D2 to detect, only a negative signal,One extreme to the other end of the wire loop.The D1 detect a positive signal, and the 4 LED. Flashing light attached to it,with frequency of the ringging tone.Which is about 20 Hz. and piezo speaker, show the audio beep .. beep, followed by a tone frequency of the ringing.
LED can be connected in series to increase, but less in proportion to the light.The circuit uses power from the telephone line.

Detect ringing signal tone with light and sound

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