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what kind of switch do I need

Discussion in 'General Electronics Discussion' started by cjdelphi, Apr 2, 2022.

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  1. cjdelphi

    cjdelphi

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    Oct 26, 2011
    I want to use a switch to control a voltage regulator output voltage by using 2 100k pots, what's the best way of switching between the 2 pots to output the 2 selectable voltage? (I lifted the pot off the regulator already)&

    would a dpdt be up to the job or do I need extra circuitry?

    thanks....
     
  2. Bluejets

    Bluejets

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    Oct 5, 2014
    What input voltage, what output voltages/current, supply circuit diagram,

    Common approach would be to use 2 regulators, not going to break the bank.
     
  3. cjdelphi

    cjdelphi

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    Oct 26, 2011
    after probing around, the voltage divider is from the regulator output voltage through the pot and to ground through a 1k resistor

    it's a 200 watt regulator and I have 1 spare, I'm working on the spare and when done I'll swap them over, having two regulators is a pain in the ass as you would have to disconnect one

    it would end up being more work than what I'm doing
     
  4. Bluejets

    Bluejets

    5,616
    1,188
    Oct 5, 2014
    As before, please supply circuit diagram of what you have and proposed changes.
     
  5. cjdelphi

    cjdelphi

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    Oct 26, 2011
    that was the problem I couldn't give you one as I hadn't yet worked out how lol

    after going away and building it, I can now give you a schematic, up until that point I wasn't sure hence my question....

    can't give you something neither of us knew how to do



    if you're interested I'll build you a schematic....
     
  6. kellys_eye

    kellys_eye

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    Jun 25, 2010
    What is the active device (regulator) that you are using? You must check that the output voltage doesn't go 'high' if the feedback (potentiometer wiper) is disconnected as most switches are break-before-make and you get a momentary disconnect as the poles swap.
     
  7. cjdelphi

    cjdelphi

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    Oct 26, 2011
    the input voltage is only a couple of volts higher at 16v as the voltage spikes to 16v the constant current part limits the current to 10amps and the voltage should drop until the button clicks into position
     
  8. cjdelphi

    cjdelphi

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    Oct 26, 2011
    anyway to be sure...

    the button is configured to always supply a voltage divider so it will always be 1 or the other, in other words it never floats, I just confirmed it with an oscilloscope
     
  9. cjdelphi

    cjdelphi

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    Oct 26, 2011
    nah, not in this instance

    [mod edit: removed SPAM link]
     
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