Re: Need Door Bell generator for whole house audio

[Art Todesco <actodesco@xxxxxxxxx>]

Speaking of RS, you could use one of
those ~$10 keychain recorders.
They record about 10 seconds.  I have
interfaced them for Halloween
spook noises to a larger amp/speaker and
an external trigger.  It was
pretty easy and they seem to keep the
sound forever .... well, for at
least 3 or 4 years, so far.

autonut843 wrote:
> I think Radio Shack has a 'ding dong' type piezo door bell element.
> Most every radio shack I've ever walked in to has it hooked up to their
> door announcer IR beam and when you walk in you hear it go
> ding dong ding  (because the pulse from the IR beam to power the thing
> is longer than the ding-dong cycle of the piezo element.)
>
> Anyway, since a piezo is just a speaker, I would go to RS, buy one of
> those, tear it apart, you'll probably see the two lead in wires that
> take 12VDC and they will go to a circuit board and from there it will
> probably have 2 wires going to the piezo.  I have a hunch that if you
> just connect the two output wires to the paging input you will get the
> ding-dong.  Now the only trick is to power it for the correct length of
> time.  Probably using a 555 as a pulse stretcher would do it.
>
> Hmm, on second thought, that may be more complex than you want to do.
> Well, that's the free advice I can think of right off the bat.
>
> Good luck, let us know how you work it out!
>