- I'm building a midicontroller in an aluminium chassis. The controller is based on Arduino.
- Inside the chassis I've got an ATX power source from an old computer. This is only used to power some cold cathode lights and is totally separate from the Arduino circuitry. However the power source does physically touch the chassis.
- On the outside panel I have a Softpot linear potentiometer. This is isolated from the metal chassis with plastic strip and glue. Also the wires are covered with adhesive tape.
When the power source is turned off the Softpot works fine. However, when I fire the source up, the Softpot goes insane and starts fluctuating like crazy. So obviously there's some interference from the power source. I just don't see how this is possible, since the Softpot is in no direct contact with the chassis. I tried grounding the whole chassis too, with no results.
Any help? Thanks!