28 Apr
2009
28 Apr
'09
6:44 a.m.
----------------------------------------
From: steven.alan.canning at verizon.net
To: cctech at classiccmp.org; cctalk at classiccmp.org
Subject: Re: What kind of IC is this LM337
Date: Tue, 28 Apr 2009 01:20:23 -0700
Dwight,
The LM337 is a 3-terminal negative adjustable regulator. It
supplies in excess of 1.5A over an output voltage range of
-1.2V to - 37V. This regulator requires only two external
resistor to set the output voltage. Included on the chip are
current limiting, thermal overload protection and safe area
compensation.
Best regards, Steven
Hi
As I said, I knew that. It is the negative
voltage compliment of the LM317.
Dwight
----------------------------------------
Saw this in the news today:
Departure of chip-design legend Bob Pease prompts outpouring in valley
http://www.mercurynews.com/ci_12167632
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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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:
> Philip Pemberton wrote:
>>
>> Roy J. Tellason wrote:
>>>
>>> "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).
http://electronicdesign.com/Globals/PlanetEE/Content/3080.html