need help electronic/relay problem phone horn

[georgebaker]

I need to ring a phone that activates a loud ass horn. Phone has no audio ports. I'd be tapping into the 2 wires that connect from phone circuit board to the phone ring speaker.

Inside the handset, the 2 wires show .035-.045 VAC (probed with multimeter while the phone "rings") and connect to an 8 Ohm 2W speaker inside the phone. This 8 Ohm 2W speaker needs to be replaced with a very loud horn or buzzer.

-I purchased a generic 12VDC piezo horn. Need to feed it 12VDC when phone rings. That's all.

I'm stumped. Low signal relay? Some type of inline amp? I can solder a bit, and have only a very basic understanding of this stuff.

Do I look for a low signal relay? like .03VAC to 12VDC?

Thank you

 

[rjenkinsgb]

Is it a conventional analog "land line" phone?
If so, the ring signal on the wall cable is around 50V AC at 20 or 25Hz, something like that.

You can buy things like this for use in factories, that just connect to the phone line:

Hosiden Bedlam T Loud Tonecaller (No Cable)

Telephone line powered (no mains voltage required). Penetrating output (105dBA typical). Volume control. Available for hard wiring (screw or I.D.C.) or with 3 metre line cord and 431A plug. REN of 0.75 - Line Powered Requires Analogue Line Socket NO CABLE SUPPLIED - CLICK HERE FOR CABLE VERSION

www.pmctelecom.co.uk

 

[georgebaker]

It's a wireless handheld intercom. No RJ11 ports

 

[rjenkinsgb]

It's a wireless handheld intercom.

Can you let us know the make & model?