modified 10 years ago

Heat Sensitive Resistor

00:39:32

Transistors can be heat sensitive indicators.  Using a 2N2222 transistor at -30 or -40 °F adjust for 5 volt reading on DC Volt meter.  At 212°F, expect around 2.5 volts.   

published 10 years ago

thebugger

10 years ago

The emitter degeneration resistor is limiting the heat sensing capabilities of the transistor. Other than that good job

thebugger

10 years ago

And its not very linear. Try changing the transistor hFE from 10 to 1k and you'll see what i mean

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