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
    15
    0
    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

    Expert

    Sep 17, 2013
    10,259
    2,508
    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.
     
Loading...