http://en.wikivisual.com/index.php/DoorbellHere is circuit diagram for 24 volt AC call bell system.
Made with off-the-shelf parts from hardware store.
Connect transformer to box with 120Volts
Box with 120Volt ac can be any wall box with receptacle.
Home doorbell system have this kind of box-and-transformer located in attic or basement or utility room ... you can tap into same transformer and use it for both doorbell and call bell.
12V AC and 24V AV transformers are sold in doorbell department of hardware store.
Buy doorbell button in same department.
Buy bell to match voltage of transformer (for example, 24Volt DC bell will not work with AC transformer)
Thermostat wire is sold in electric department of hardware store.
Add a comment if you need more help.
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