> Can someone answer the question of how to make a pot scale more > finely? If you insert a resistor in the output path, does this divide > the voltage and weaken the effect of the pot? I don't know much about > circuits. The answer is not very straightforward, as it depends on how the pot is being used. Generally to have more control with a pot, i.e. so that larger movements have less effect, so you can finely position it to *just* where you want it to be, you have to reduce its value. But then depending on how the pot is being used, you will need to add one or more resistors to compensate for this lowering of value: if the pot is actually being used as a potential divider (that is how the name 'potentiometer' is derived), you will need to add resistors either side to bring the total back up to the original value, but how much each side will depend on where out of the total range, the now reduced pot is to have its effect; if it is being used as a variable resistor (the wiper connected to either end or one end left open), again another resistor will probably be needed, but you will only need one, and which side of the pot it goes will not matter. If you have a particular pot in mind on a particular module, I might be able to make suggestions on exactly *what* values to use and *where* to add the resistors (depending on whether I have the circuit for that module of course!), but if it was a general question, then I'd suggest your best course of action would be to either look around on the web for some basics electronics sites (there will be tons out there!), or buy a beginners book (your local Maplins/Radio Shack/whatever will undoubtedly have something suitable), and then get studying! I'm afraid there is not substitute for you putting in some work in order to gain some understanding of how all this stuff works! Tim
Message
Re: basic circuit question
2008-08-10 by Tim Stinchcombe
Attachments
- No local attachments were found for this message.