Telephone line status indicator with VU meter

This is a simple telephone line status indicator which is very handy to check if a phone line socket is working.

It will give a visual indication of 3 line status.
1.- Standby
2.- Engaged
3.- Ring tone

To make it is simple.

Old VU meter, one resistor 220 - 470 k.Ohms, small bridge rectifier.

This one I made up for the New Zealand phone line sockets, but can be adapted to fit any phone socket.