I have a tone generator that will give me a telephone ring if I close two contacts - I would like said ring fed through my pa to the plant floor -easy enough, but...
I want it to sound *only* if a certain extension in the phone system rings.
I plugged an older style phone into the extension jack, the tried to power a N/O relay by connecting the lines that feed a coil for the ringer - it pulses too fast; the relay closes and opens too fast for the tone generator to catch it.
I know there are already devices to do this that have a RJ11 jack to simply plug into a phone jack, but I'd like to try to build a (simple ?) circuit myself just for yucks.
Any hints / ideas ?
Thanks
