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

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