Tempertaure Detector help

ericgibbs said:

What is the actual value of the +12V rail???


Eric

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i didnt get what voltage u are asking

ericgibbs said:

Did you add a resistor to the 47K pot as RonH advised??

Eric

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i didnt. ill add it and check now

ericgibbs said:

What is the voltage at the junction of the thermistor and resistor?

Eric

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its around 7volts

On your drawing its says +12V supply[rail], what is the measured voltage.?

If the voltage on the therm/47K junction is about +7V then adjust the 47K variable so the wiper of the variable is about +7V.

As you adjust the variable voltage from say +6V to +8v and back again, the output voltage of the comparator should switch, does this happen.

If yes, what are the measured voltages on the comp output?

Eric