John,

Most door bell I have seen uses a cheap receiver chip PT2272 and the
transmitter chip PT2262 made by Princeton.  They have the simple circuit
at their web site.  It will do what you wanted to do.  Have fun.

http://www.princeton.com.tw/coprofil.htm

Eric


John Pearson wrote:
>
> I am looking for a wireless doorbell. I need one that has a pretty strong, battery powered transmitter, so that it can operate the door bell from inside a car on the street.
>
> Any suggestions?
>
> Thanks
>
> John
>
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