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- - Thermistor protection (http://www.videokarma.org/showthread.php?t=267082)

timmy

05-25-2016 09:32 AM

Thermistor protection

On these thermistors that are 120 ohms cold what should they be hot. And what would be an acceptable voltage drop in b+ after warmup, say a few minutes.

bandersen

05-25-2016 11:49 AM

That all depends on how much current is flowing through it. Assuming you mean a CL-90 thermistor, the datasheet says about...

8 ohms at 0.5A
3 ohms at 1A
2 ohms at 1.5A
1 ohms at 2A

timmy

05-25-2016 12:46 PM

I have a new thermistor that was for an RCA and it's 120 ohms cold but hot it's 5 ohms so with that I'm also 5 volts less on the b+ with that 5 ohms present while running.

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