Ringing Voltage from Phone

How would I get a relay to operate with the ringing voltage on the phone line Rick

Reply to
trickyrick
Loading thread data ...

formatting link

Reply to
JeffM

start with a relay having about 1800 ohms coil resistance operating voltage 12V DC hook that to the DC side of a bridge (can use 1n914 diodes etc) and put a 250v 1uf capacitor in series with the AC terminals of the bridge

should work. REN approximately 1.

If the relay chatters put a shottky diode in parallel with it. if that doesn't help enough put a capacitor there too.

if you measure over-voltage on the relay coil use a smaller capacitor

Reply to
Jasen Betts

You have to detect 90 volts ac. Not hard to do.

Reply to
Charles

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.