8 Jan
2009
8 Jan
'09
9:26 a.m.
Philip Pemberton wrote:
Roy J. Tellason wrote:
http://electronicdesign.com/Globals/PlanetEE/Content/3080.html
"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).