27 Apr
2009
27 Apr
'09
9:50 p.m.
----------------------------------------
Date: Mon, 27 Apr 2009 12:44:18 -0700
Subject: Re: What kind of IC is this
From: glen.slick at gmail.com
To: cctalk at classiccmp.org
On Thu, Jan 8, 2009 at 10:26 AM, Jim Battle wrote:
Hi
I found it interesting but I do know what a LM337 is.
I've had the honor to have lunch with Bob once.
Dwight
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Philip Pemberton wrote:
Saw this in the news today:
Departure of chip-design legend Bob Pease prompts outpouring in valley
http://www.mercurynews.com/ci_12167632
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).