Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!purdue!decwrl!pyramid!leadsv!practic!vlsisj!davidc
From: davidc@vlsisj.VLSI.COM (David Chapman)
Newsgroups: sci.electronics
Subject: Re: Electronic Pest Control
Summary: 15.75 kHz
Message-ID: <15271@vlsisj.VLSI.COM>
Date: 19 Jul 89 03:03:19 GMT
References: <12726@well.UUCP>
Reply-To: davidc@vlsisj.UUCP (David Chapman)
Distribution: sci
Organization: VLSI Technology Inc., San Jose, CA
Lines: 15

In article <12726@well.UUCP> fgk@well.UUCP (Frank G Kienast) writes:
>> [stuff deleted]
>> verbage) produced a 14KHZ sound wave. This just so happens to be the
>> mating frequency of la cucharacha..the despised cockroach.
> 
>Then wouldn't cockroaches also be attracted to TV sets?  TV sets produce 
>sound at 14.7KHZ.
> 
U.S. TV sets scan at 15.75 kHz, not at 14.7.  The flyback transformer tends
to whine at that frequency (drives me nuts if it's too loud).
-- 
		David Chapman

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