Am I the only person who saw an attachment to this email which has
nothing to do with this email but rather was supposed to be attached
to the other thread: "[EE]: Single power supply, true-AC-input analog
to digital interface" by Electron?

I don't know if Gmail messed up (I use Gmail) or if the list did, but
I see a GIF of a schematic attached to BOTH this message and
Electron's.

Sean


On Sun, Jan 8, 2012 at 3:39 PM, Carl Denk <cdenk@windstream.net> wrote:
> I have a standby 240 volt electric resistance furnace with 24 VAC control=
s.
> Since the electricity costs are large, and usage due to some minor item
> failure on the main fuel supply, I am looking for an brief beep audible
> warning when the unit is powered up. The sound should be very brief (mayb=
e a
> second or less), not an unpleasant tone or high volume. The unit is in th=
e
> basement, and should be able to hear it on the 1st floor. This should be
> just barely heard, so as not to startle, or might even choose to ignore f=
or
> the moment. Cost not a priority since this is one off.
>
> I have thought of using a 555 timer, with a rectifier bridge and a 78XX
> regulator off the 24 VAC circuit and a sonalert sort of noise maker. Also
> have thought of a relay that opens it coil circuit when energized, and th=
en
> something to keep the circuit open until next furnace usage.
>
> Any thoughts would be appreciated, and thanking in advance. :)
>
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