ECM

[Hairy Harry]

OOOH !!!

Another nasty noisemaker is the "chattering relay" noise
source. Take a large relay (motor contactor?) and provide
the coil power through the normally closed relay contacts.
So it will act as a buzzer. THEN you make a really long loop
in series with the coil/contact... and either tack it to the
ceiling... or wrap it many turns around the mains...

This will kill just about anything... but it makes a lot of
acoustic noise... so put it in a heavy wooden box, suspended
by springs...

THEN to be really bitchy... use a contact mike, or piezo pickup,
taped to the ceiling. Amplify the BASS guitar, filter, and drive that
relay on / off.

He plays... it buzzes...
He stops... it stops...
He plays....

Soon he will be buying a new guitar and amplifier... and the fact that
the buzzing is associated with HIS playing will probably get the neighbors 
thinking that the TV and Radio interference is ALSO his fault.  This will 
kill TV and Radio for some distance...

Hmmm this gets better and better...

H^)  harry


>From: The Old Crow <oldcrow at oldcrows.net>
>To: "Fraser, Colin J" <colin.fraser at calanais.com>
>CC: "Synth-Diy (E-mail)" <synth-diy at node12b53.a2000.nl>
>Subject: Re: ECM
>Date: Tue, 8 Aug 2000 16:39:11 -0400 (EDT)
>
>
>On Tue, 8 Aug 2000, Fraser, Colin J wrote:
>
> > I'm looking for a schematic for a device to produce strong
> > electromagentic fields that will interfere with his amplifier, but not
> > do any permanent damage to my own gear.
>
>   Build a spark-gap transmitter.  *Guaranteed* to give him fits as he
>tries to find where the 'bzrrrt bzrrrt' noise is coming from, heh heh
>heh...
>
>   Someone on the list recently posted a URL about DIY spark transmitters.
>It went something like...
>
>http://www.cinemedia.net/SFCV-RMIT-Annex/rnaughton/SPARK_SOUNDS.html
>
>   I built a s-g transmitter and receiver as a kid.  Fun stuff, and noisy
>as hell. ;)
>
>Crow
>
>/**/
>

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