On Sat, 26 Mar 2016 06:11:45 -0500, "Mark Zacharias"
wrote:

"Jeff Liebermann" wrote in message
.. .
On Fri, 25 Mar 2016 05:48:15 -0500, "Mark Zacharias"
wrote:

Cautioned him on speaker hook-ups, gave him our hand-out sheet explaining
speaker connections,
which also contains explicit warnings about shorting wires etc.

Put a 0.5 ohm xx watt resistor in series with each speaker. Paint the
resistors with whatever concoction generates the most noxious smoke
possible[1]. Then he shorts the leads again, the resistor(s) will get
hot, smoke, stink, and NOT blow up the output stages. There will be a
loss in output power, which presumably he won't notice unless he's
running low impedance or low efficiency speakers.


[1] Cotton soaked in propylene glycol or white mineral oil which is
what we used for wind tunnel airflow visualization. Propylene glycol
doesn't stink very much, but white mineral oil really reeks.

You, sir - are an evil Genius!
mz

Thank you. Think of it as a VERY slow blow fuse with a built in
"indicator". I suspect that even the most dense customer will
recognize smoke as an indication that perhaps something is very wrong.

Many years ago, when I was an aspiring juvenile delinquent, I removed
one end of a 3AG cartridge fuse, stuffed it with cotton, added a few
drops of 3-in-1 oil, installed a 0.5 ohm resistor, and somehow
soldered it back together without starting a fire. I'll pretend not
to remember how I did that. The plan was to make some sort of bomb to
irritate some of my friends. Instead of exploding, it produced a
substantial amount of smoke and attracted some unwanted official
attention. While I don't believe that the world needs a smoking fuse,
a similar leaded component might sell to like minded dangerous
individuals, such as myself, as an over current alerting system. With
some additional complexity, I could add a chemical timer set to
slightly longer than the warranty period. I have some ideas on how to
do an SMT version.

Hmmm.... Kickstarter perhaps?

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558