Homebrew PCBs

Hi Phil,

If I recall correctly, the sensor is located adjacent center-bottom 
of the lower roller.  Unfortunately, the temperature of the sensor 
and of that portion of roller the PCB contacts are probably 
different.  In a feedback control circuit, the sensor only has to 
sense something proportional to the parameter being controlled.  To 
illustrate, the temperature at the sensor may only be one-tenth of 
that of the place where you want the temperature controlled.  The 
control circuit must then provide gain to make up for the lack of 
sensor sensitivity.

--- In Homebrew_PCBs@yahoogroups.com, "Phil" <phil1960us@y...> wrote:
> 
> I was thinking that I would need to open it up, find the temperature
> sensor, put the thermistor there, close it up and run it until the
> light comes on.  Then feed a piece of copper clad through and see 
> what happens.