Telephone Ring Generator Using Small Power Transformer


Posted on Feb 6, 2014

The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is produced from the 120 volt side of a small 12. 6 VAC power transformer (Radio Shack 273-1365). Both capacitors connected across the transformer windings are non-polarized / 100 volts. Circuit draws about 300mA fro


Telephone Ring Generator Using Small Power Transformer
Click here to download the full size of the above Circuit.

m the 12 volt DC power supply during the ringing interval.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Polarity changer Switch
    Frequency-to-volt age converter
    Slave Flash Trigger
    Power Buffer Boosts Reference Current
    Solar Cell Voltage Regulator
    Klee Sequencer Circuit Theory of Operation
    Cellphone-Based Device Control With Voice Acknowledgement
    new 4 channel portable audio mixer
    Battery simulator provides current limiting
    variable step up dc dc converter 2
    Free-Power AM Radio
    Mini GSM localizer without GPS
    Electric Field Mill Fabrication
    dub siren circuit
    Photoreceiving circuit diagram LM307 amplifier configuration
    Attenuation feedback tone circuit



    Top