Pot replacement choice??

Discussion in 'The Projects Forum' started by SvenS, Apr 4, 2010.

  1. SvenS

    Thread Starter Member

    Nov 18, 2008
    Maybe you can answer this?

    I have a metal detector. It has a sensitivity (gain) 100k pot.
    It does have 10 detents, not that it really matters to me.

    Right now the best adjustments to get full depth is between 9-10
    on the detent postion. When I turn the pot lower than 9, I loose depth about 50%.

    I want to change the pot out so the current usable range from 9-10 is
    spread over a range of detent 5-10. What pot value should I use?
  2. SgtWookie


    Jul 17, 2007
    Actually, you may just need to add a resistor in series with one of the "ends" of the existing pot.

    I don't know if you have a linear or audio (log) taper pot installed. It may say on it.

    However, here's a couple of ideas for you. If adding a 100k resistor in series with one "end" of the pot doesn't work, try it in series with the other end. (Plan A)

    If that doesn't work, you may have to replace the 100k pot with a 50k pot, and the resistor with a 51k or 47k resistor. (Plan B)

    It may be that the original pot is an audio/log taper pot, and was wired backwards. You might try switching the wiring to the ends of the pot.
  3. SvenS

    Thread Starter Member

    Nov 18, 2008
    Thanks, will give it a try.