I'm wondering if the circuit would be different for a single supply. In my application, i'm making an over 0V detector, with a switchpoint of about 50 mV on the upward swing. Therefor, my ref would be connected to Ground.

Your 3peak sheet shows no ref R, but the other sources do show a ref R. What's the function of the ref R? What's drawback of not using it? Is it needed with the LM239 and a single-supply?

Same question re input R. The TI sheet one, but the other sources don't.

Same question re pullup R on the output.

thx

A

Anonymous

To understand this type of circuit, it is necessary to study operational amplifiers and comparators.

Sorry, but I believe this is not the best place to get help with general electronics issues. Perhaps a forum with a larger community can help you with questions not directly related to the component itself.

Maybe in the general electronics section of the Arduino forum you can receive answers to questions of this nature, but it would be great if you could take an analog electronics course, there are free online courses on the internet, if you can research about it.

https://forum.arduino.cc/index.php?board=5.0

https://www.eevblog.com/forum/chat/?PHPSESSID=hn25i7vcgq9vinb4hp18cc2de0

J

john239955_stm1_stmicro_comAuthor

Visitor II

Ok, understood. Thx!