old phone as doorbell

[winnie]

A more expensive pre-made device:

2PCS RINGING GENERATOR PCR-SIN03V12F20-C IC Power Dsine 3W 12VDC TO 70V 20Hz RED | eBay

New 2PCS PowerDsine/ PCR-SIN03V12F20-C / RINGING GENERATOR 3W 12VDC TO 70V 20HZ. The module has 5 wires RED+BLACK COLOR, 5 WEIRS +CONN. INHIBIT yellow. V+ (12V) red. RNG2 white.

www.ebay.com

 

[ggunn]

Somewhere in my garage I have a phone ringer that I used to ring an on stage practical telephone when I was doing community theatre sound design.

 

[Joethemechanic]

Somewhere in my garage I have a phone ringer that I used to ring an on stage practical telephone when I was doing community theatre sound design.

In high school I had a regular telephone magneto for that. As soon as they picked up the crank got really hard to turn. Big change in impedance

 

[don_resqcapt19]

In high school I had a regular telephone magneto for that. As soon as they picked up the crank got really hard to turn. Big change in impedance

Like a hand crank megger...you did not have to look at the meter to know the circuit was shorted.