Robin,
the electronics hobby catalogues often sell kits to build your own
systems like this. They use the chips widely used for garage door remotes.
Some of the electronic surplus stores sell surplus items ready to go. Many of
these stores have a web prescence. for an example see Alltronics website. If
you are moderately handy with a soldering iron this can be a very inexpensive
way to go.
>> Tim Hughes <<
hi100@xxxxxxx
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