Re: [ATM] Electronics help needed - temperature control

["matt" <electro_optic@bellsouth.net>]

No need to equate cheap with simple nowadays in electronics.
I routinely obtain free samples of very advanced/complex IC's by simply
asking for them on the manufacturer's web sites.
Some of the largest semiconductor companies , among which Analog Devices ,
Maxim Semiconductors (which now includes Dallas Semiconductors) , Texas
Instruments (which includes Burr Brown and others) , Agilent (former Hewlett
Packard ) will simply ship free samples to home addresses no questions asked
, and they do it promptly and reliably .
As far as temperature circuits are concerned, the above companies have
integrated solutions with the temp sensor, proper signal conditioning,
calibration, differential measuring, etc , all on one chip, with a choice of
digital (serial , SPI, or PWM outputs) or simply analog output , linear ,
calibrated and accurate to a level that is impossible to obtain with a more
discrete design without spending a lot of time and money.

best regards,
Matt Tudor , MSEE


-----Original Message-----
From: Don Clement <clement.focuser@verizon.net>
To: ATM <atm@atmlist.net>
Date: Saturday, April 22, 2006 5:32 PM
Subject: Re: [ATM] Electronics help needed - temperature control


>
>Kevin wrote:
>
>> If you're as lazy as I am, you will want it automatic.
>>  A germanium diode or germanium transistor with the
>> properly-polarized amplifier after it will turn the
>> fan on for you.
>
>No need to use germanium, silicon will do. The bandgap circuit is the basis
>for cheap linear temperature sensors such as the LM335
>http://www.national.com/pf/LM/LM335.html#General%20Description . Every
mixed
>signal integrated  circuit today; used in  ipods to cell phones, use the
>bandgap reference in some form. See:
>http://users.ece.gatech.edu/~rincon/classes/ece4430/handouts/l39_bg.pdf
>
>
>
>As with Gil, It's not laziness; just my parsimonious Scottish heritage.
>(Although not a pure single-malt, rather a Tennessee sour mash with bits of
>Old Hickory floating about)
>
>
>
>Don Clement
>
>Running Springs, California
>
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>ATM mailing list http://www.atmlist.net/
>

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