Electronic Alarms and Home Security Devices - Doorbell wiring

Hi to all,
I have a two storey home, with only one doorbell which is located, and only sounds on the top floor. The bell switch has just two screw terminals, and I have paralelled wiring to a room on the ground floor. Here is the problem, when I hook up any device to the two wires on the ground floor the battery in the bell upstairs immediatly sounds/powers the new device. What should I do? Do I need some sort of resister in the line to upstairs?
thanks in advance for any comment
Bryan H :confused:

What kind of device are you trying to connect?

Hi, Thanks for your interest
I am trying to connect a piezo 90 db beeper/alrm sounder.
It works fine on a 9 volt battery, has two wires red & black.
I would like to attache a diagram but I don't know how
It goes "door switch to upstairs bell powered by batteries", and I wish to also go "Door switch to piezo device paralelled from same switch".
look forward to your comment.
bryan h

Hmm, that may not work.

It sounds like you have a 9-12vdc device. Doorbell loops are 24-27 VAC. Powering dc circuits with ac voltage tends to let the smoke out.

Basically all the doorbell switch does is close the circuit from the transformer (in your attic/utility room/any of a dozen places) to the bell sounder. The place you need to tap is at your existing bell unit, but that needs to be with something that can handle the type of voltage in the bell loop.

You could use a 24VAC Relay Module - like <a href="http://altronix.com/p_pdf/RB1224.pdf">this one from Altronix</a>.

Of course, this means you'll have to power the piezo separately (which you need to do anyway) - so you'll also need a 9-12VDC power supply.

Good luck!