I am on to my next project which doesn't seem to be working as planned. At first I thought that I would find a boatload of pages on how to do this, but to my absolute surprise I couldn't find anything without having to resistor swap! I am trying to read from 9v-42v. Think its easy? Think again!
There are Chinese circuits you can buy online cheaply that do it, but wheres the fun in that, i want to build it!
Can anybody help me?
This is what I am trying to build (and simplify - I don't need all the features), I could buy it but I wont learn! Its a motor controller circuit. It runs 12-60v DC - why didn't he use a single resistor divider too? is he a fool like me? he obviously knew what he was doing, instead R1 has to be swapped depending on what voltage is running, 12v, 24v, 36v, 48v but this isn't the only circuit I've seen, some have op-amps or A to D converters, but why? dont they know what they are doing? A resistor divider would be just fine? this is why Im asking the question. I didn't want to hear just resistor divider, i was hoping to see something better and then understand why!