9 Jan
2009
9 Jan
'09
3:05 a.m.
On Thursday 08 January 2009 11:54:38 am Philip Pemberton wrote:
Roy J. Tellason wrote:
Yeah, I started browsing through his other articles after reading that one,
and ran across a link to that device somewhere in the process. Saved the
page with the smallish diargam on it (I couldn't really see it on my screen),
and will look into it one of these days...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
"One of the celebrated things Widlar did was
to put a "hassler" in his
office.2 When a person came in to his office and spoke loudly, this
circuit would detect the audio, convert the audio to a very high audio
frequency, and play back this converted sound.
[snip]
I *want* one of these...!
It was published in Electronic Design magazine:
"What's All This Hassler Stuff, Anyhow?" (Pease Porridge)
Pease, Bob
Electronic Design, May 15, 1995
I've got a (signed!) copy of the article here. Five op-amps (1x LMC6484,
LM837 or similar + 1x LM301A), two transistors (jellybeans), a handful of
Rs and Cs, half a dozen 1N914 diodes, a tweeter (Radioshack 40-1383 or
similar -- 2x6" piezo horn tweeter) and a microphone (Radioshack 270-090 or
similar -- basically a cheap PCB-mount electret element).