Re: Caller ID through 12 volt interrupt on whole house audio

["E. Lee Dickinson" <lee@xxxxxxxxxxxxxxxxxxxxx>]

"Andrew Gabriel" <andrew@xxxxxxxxxxxxxxxxxxxx> wrote:

> Well, that's a different continent from me, but a google
> search turns up 139,000 results...
> http://www.google.com/search?hl=en&q=sound+activated+relay


Which likely explains why he asked for a specific recomendation, after
admitting to being weak on hardware knowledge.

I've had great luck with www.electronickits.com for this sort of thing.  Not
the most affordable kit builder out there, but they have great instructions
and a great selection.

One thing to note -- If you can find a line level kit, that'd be superior to
one which uses a microphone. You could solder the line directly to the mic
input, but you'd run the risk of frying the comparator or whatever is doing
the triggering.  Someone who actually knows something about electronic
theory (as opposed to me, who just knows how to make things work) could tell
you if some resistors would protect you from that. Or maybe an audio
matching transformer.