Sadly my maths education was spent drawing pictures of people, writing down the names of my favourite tracks, and going home. I did not take much in at after the age of about 11. I am having a problem with trying to work something out.
I am building a glitch desk from an old dj mixer case and want various controls such as pots. Because different machines require different value pots, I will need to be able to switch between the various resistances such as 1 meg, 470K, 100K etc. I wired up a one meg pot and was planning to reduce the overall resistance by using voltage dividers that can be selected by a rotary switch. So a 1 meg pot with a 1 meg resistor in paralell with have an overal voltage of 500K. What I would like to do is work out the other values by using an equation rather than trial and error. I know the formula for working out the overall resistance of resistors in parallel but I cannot for the life of me work out the individual resistance of a resistor when I know the overall value. So for instance if the overal value is 100k, what resistance would Resistor A (the voltage divider) be when Resistor B (the pot) is 1 meg?
Any pointers would be much appreciated.
P.S. anyone off to The Glade Festival this weekend?