using a 2 pole 6 way rotary switch

Discussion in 'General Electronics Chat' started by navin advani, Apr 28, 2016.

  1. navin advani

    Thread Starter New Member

    Apr 28, 2016
    2
    0
    Hi,

    I have Dunlop 535Q wah pedal for my guitar. One of the features of this pedal is a 6 way switch that can switch between 6 different capacitors.
    This is the wah. http://www.jimdunlop.com/product/535q-cry-baby-multi-wah

    However when one is playing one never knows which position this switch is in. So I figured I could replace the 1 pole 6 way rotary switch in the wah pedal with a 2 pole 6 way switch and use the second pole to switch a RGB LED.

    The idea was to have 6 positions. Red, Green Blue, Yellow/Orange (a mix of Red and Green), Purple/Violet (a mix of Blue and Green) and Aqua (a ix of Green and Blue).

    Position 1: Red
    Position 2: Blue
    Position 3: Green
    Position 4: Red + Green
    Position 5: Red + Blue
    Position 6: Blue + Green

    How would one do this. The LEDs I am using are these:
    http://in.element14.com/kingbright/...b-5mm-x-bright/dp/2290375?CMP=i-55c5-00001621
    or
    http://in.element14.com/kingbright/...colour-rgb-5mm/dp/2290374?CMP=i-55c5-00001621

    When I connect the LEDs (via a current limiting resistor) in parallel they short out so all positions end up with one colour. I assume I have to use some diodes before the LEDs connect to position 4, 5 and 6 to prevent the current from going "backwards".

    Help or Advice would be appreciated.

    Thanks.
     
  2. Marley

    Member

    Apr 4, 2016
    144
    40
    Diodes are what you need. These will isolate each switch way from each other but route the current as required.
    Use small general purpose diodes like 1N914 or 1N4148
     
    navin advani likes this.
  3. navin advani

    Thread Starter New Member

    Apr 28, 2016
    2
    0
    Thanks Marley.

    I am judicious about parts count and tried to use just 3 diodes to block the reverse current. I assume we would need at least 6. Can we eliminate the 3 circled in orange in the picture attached?

    Thanks again.
     
  4. Marley

    Member

    Apr 4, 2016
    144
    40
    Yes you could.
     
    navin advani likes this.
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