Re: [ATM] Electronics help needed - temperature control

[Kevin MIchael Zabbo <chaosopher23@yahoo.com>]

I'll do my best with it.  I figger (practicing
Southernese, US Mississippi dialect) I could build one
that can do a heating or cooling so that it would turn
the fan on if it's outside of a range, up or down in
temperature.  I'll work with SPICE on this one.

Kevin

--- Don Clement <clement.focuser@verizon.net> wrote:

> 
> Kevin,
> 
> 
> 
> Perhaps you would design and build a differential
> temperature control
> circuit using the 1N34 germanium diode. Post it up
> on the web for other TNs
> to use for controlling fans or automatic dew
> prevention.
> 
> 
> 
> Don Clement
> 
> 
> 
> 
> 
> 
> 
> > Silicon isn't as cheap for the amount of
> temperature
> > differences we're talking about here.  Silicon
> doesn't
> > vary as much as germanium.  The 1n34A diode (40
> cents?
> >  Less?) is very cheap and predictable.  Besides,
> once
> > the temperature equalizes, you can flip a switch
> that
> > transfers the energy from the temperature sensor
> > system to a crystal radio, and tune in to a few AM
> > stations while you observe.  1n914's don't do that
> as
> > well. <weg>
> >
> > Kevin
> >
> 
> 


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