Telephone Ring Generator Circuit

  
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This is circuit that produces a ring generator will ring a telephone once every 10 seconds. The interval between rings can be lengthened or shortened by varying the value of the 1 Mega Ohm of resistor. Here`s the circuit schematic. This circuit is using small power transformer. The 70 volt/ 30 Hz ring voltage is produced from the 120 volt side of
Telephone Ring Generator Circuit - schematic

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 from the 12 volt DC power supply during the ringing interval. This circuit is controlled by 556 timer IC.



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