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Telephone tone ringer

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  • Nicolae Sfetcu
    Telephone tone ringer The MC34012 tone ringer derives its power supply by rectifying the ac ringing signal. It uses this power to activate a tone generator and
    Message 1 of 1 , Mar 5, 2001
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      Telephone tone ringer

      The MC34012 tone ringer derives its power supply by rectifying the ac ringing signal. It uses this power to activate a tone generator and drive a piezo-ceramic transducer. The tone generator circuitry includes a relaxation oscillator and frequency dividers which produce high and low frequency tones as well as the tone warble frequency.

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