Re: [ATM] Electronics help needed - temperature control

["Don Clement" <clement.focuser@verizon.net>]

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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