Re: Could someone please explain how this works?

Eric R Snow wrote:

Greetings All,
This link:
http://www.vellemanusa.com/downloads/0/manual_mk138.pdf
is the schematic for a thermostat kit I built. Even though it works I
don't understand how it works. The high temperature limit is too low
for what I want to use it for. But I think that using less resistance
for R5 will raise the upper temperature limit. Am I right? And if I
am, why? Thank You,
Eric
To add to the description of the circuit. the NTC decreases in resistance as it gets hotter.
NTC = negative thermo coefficient (reduces in R as temp goes up)
PTC = Positive xxxxxxxxxxxxxxxxx (increases in R as temp goes up).


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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