Hey guys,

sorry to get back on this one, but I've got a question (might be a stupid one). In the voltage window comparator circuit posted by bertus, there's the resistor Rv. First, is this a potentiometer? Second, where does that input-voltage connect? A potentiometer has but 3 inputs, so I don't quite get it...

Thanks in advance!

 

It should be better to provide the link where the circuit is shown.

 

Welcome to AAC. Please don't hijack threads, as it is confusing as to whom the replies get made. The original thread is http://forum.allaboutcircuits.com/showthread.php?t=26663

Rv is a potentiometer, with all three pins indicated. The input is common to both comparators.

 

To Mik3 - sorry, I had a distraction in posting the reply.

 

Rv is a potentiometer and it is used in the circuit to simulate a variable input voltage. You can remove it from the circuit use any input voltage you want to compare (in the operating limits of course).