Replacing traditional pot with digital pot

Discussion in 'Digital Circuit Design' started by RodSTAR, Sep 22, 2017.

  1. RodSTAR

    Thread Starter Member

    Jan 3, 2008
    Hello masters!,
    I'm trying to replace a traditional (knob) 10k pot with a 10k digital pot. Finally I've got several 10k digital pots but the problem is that as datasheet says: wiper voltaje accepts only +/-5V while the application is in +/-20V (measured with my tester).

    So the question is: How can I trick the circuit so I can wipe +/-20V with the +/-5V (in wiper line) digital potentiometer i've got. I guess some basic resistor circuit trick or something.

    Extra data1: It's for an ultra cheap 2000W 220V AC SCR dimmer.
    Extra data2: Digital pots I have is a X9C103P.
    Extra data3: My english is crap, sorry for mistakes.
    Regards, Rod.
  2. Alec_t


    Sep 17, 2013
    No schematic? Not knowing what your circuit is, perhaps you could use the digi-pot to control the LED current in an opto-isolator, and use the opto's output transistor to trigger the SCR.