Re: LM 393 switching soft



John Fields wrote:

Terminal Crazy <Terminal_Crazy@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Hi guys, hope someone can help.

I've got a LM393 on a 12v supply measuring a thermistor. I've got it
switching around the right temperature but have a grey area where the
output ramps up brightening the LED until it switches fully on.

How do i increase the feed back so the output switches from 0 to 1 ?

---
You'll need to introduce some hysteresis

i.e. some small positive feedback.


by connecting a large-valued
resistor form the output to the + input.

Typically. Cs can help too.


Got a schematic?

Always a good place to start.

Graham


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adjustment to my email address


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