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  1. #1
    300+ Forum Addict XOrionFE's Avatar
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    What kind of POT?

    I have the Hagstrom USB 108 interface which has Joystick inputs....

    Joystick Analog Inputs

    Three analog inputs are provided on the KE-USB108 to allow for potentiometer usage for joystick X, Y, and Z axis controls. Connect any potentiometer from 10K to 1M resistance values to the KE-USB108 to produce action on the desired joystick axis. The individual axes may be enabled or disabled allowing for the use of any or all of the joystick axis inputs.



    I see that it says 10K to 1M resistance and not sure what that means but my objective is to create my own trim wheel (for GA aircraft) and hook it to a pot and interface it through the Hagi. Does this sound like the right way to add a trim wheel and if so is there a specific type POT that someone could suggest as I have never interfaced pots...only switches thusfar.

    Scott

  2. #2
    150+ Forum Groupie pdpo's Avatar
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    HI there,

    10k means 10000 ohms
    1M means 1000000 ohms
    100k is quite a standard value for potmeters. There are even potmeters which need 5 or 10
    full turns for the full travel from 0 ohms to 100k ohms (linear) which are I think a good solution for the trim of a ga airplane

    Greetz Peter

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    300+ Forum Addict XOrionFE's Avatar
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    Ok

    Looked at Radio Shack and found a 100K-Ohm Linear-Taper (250VDC - .25W) 1 Turn

    Would this be appropriate?

  4. #4
    150+ Forum Groupie pdpo's Avatar
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    Hi,

    that could work if you want to turn you're trim only one turn for the full range ...

    Greetz Peter

  5. #5
    300+ Forum Addict XOrionFE's Avatar
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    Just looked again and in reality it is only 300 degrees. That wont be very realistic. Probably need to find one that is 10 turn.

    Anybody have a good electronic supply company in the US Midwest?

  6. #6
    25+ Posting Member mterm's Avatar
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    There is a on-line electronics company I have used that is good. They even have technical support for help choosing what you need.

    www.mouser.com

  7. #7
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    I would suggest avoiding taper or logarithmic pots, these are more for hifi volume controls etc. For sim controls you need linear pots, slide or rotary.

    Gwyn

    737NG using Prosim737, Immersive Calibration Pro, Aerosim Solutions motorized TQ & cockpit hardware, CP Flight MCP & FDS SYS1X, SYS2X & SYS4X, FDS PRO FMCs, AFDS units & Glarewings, Matrix Orbital ELEC display, Pokeys Landing & Cruise alt display, Buttkicker Gamers, 3 x BenqMW811ST projectors with a Matrox Th2Go
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  8. #8
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    Jameco (www.jameco.com) is a California electronics supplier you might consider. They have a 10-turn 20Kohm pot that should do. (Jameco part #771163) I like Jameco because they often have the lowest price on small quantity orders.

    Digikey (www.digikey.com) is another option.


    Potentiometer background info: http://www.mikesflightdeck.com/potentiometers.htm

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    300+ Forum Addict XOrionFE's Avatar
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    Thanks guys. I actually got lucky and found a company in the US Midwest that is about 15 miles from my office! Tri-State Electronics. They have a pot that looks just like what I need.

    https://www.tselectronic.com/nte/534.html

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    I'm building one shortly

    I'm about to start on my center console so I'm looking into what would work best for the trim wheel. In real GA a/c the trim wheel rotates many times so using a normal pot seems too unrealistic. You will need to incorporate some gearing so that you can turn the pot fewer turns per trim wheel rotation.

    I'm going to try to use a component (cord operated tilter) found in 50mm venetian blinds. This is the component that tilts the slats when you pull on the cord. http://www.windowblindsparts.com/Com...ics/lpctpw.jpg . It's basically a 90 degree gear with a plastic spool on the end of it. Nice thing is that it is encased, compact and simple as opposed to external gearing. Only about AUS$15 from blind parts stores. It will take minor modification (mounting holes and some work attaching the trim wheel and pot etc) but the nice thing about it is that the reduction gearing seems quite realistic. I'll be working on this shortly to see if in fact it will work as well as anticipated.

    Cheers.

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