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  1. #14
    Join Date
    Jan 2007
    Location
    Stongsville Oh
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    Outstanding job! When I worked on Trane equipment for one company I had a resistance decade box. You exceeded that box. Only difference is the decade box could be used for other troubleshooting, simulating sensors etc. Great job.
    ckartson
    I didn't write the book I just read it!

  2. #15
    Join Date
    Jun 2014
    Posts
    83
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    Thread Starter
    There are a few things I'd change...

    1. Use a plastic box. That terminal strip is pretty close to other components that I'd rather not short out.

    2. One of the positions would just be to use the leads as a jumper with no resistor.

    3. Only put numbers, not the function description. I've come to find out that not all functions are in the same order on these units. The number does (so far) always correspond to the same resistance value.

    4. Not an improvement, but I had an instance where the unit was on a VAV system and didn't want to work in test mode.

  3. Likes kbr58 liked this post
  4. #16
    Join Date
    Feb 2015
    Location
    Coastal South Carolina
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    301
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    I used to be in electronics field and over the years built a few devices that I thought of selling. I also learned a valuable lesson in cost vs selling price of my inventions. A device that cost me $20 to build must sell to consumer at a cost of $100 for me to make any money. This figure takes into account cost of everything I supply such as parts and labor also my profit,the middle man's profit and any associated marketing costs.
    In small numbers like you more than likely work in all this won't apply but if it would happen to go anywhere these numbers start to come into play. Makes keeping your production costs down much more important. Been there done that.

  5. Dislikes trentjci disliked this post
  6. #17
    Join Date
    Jan 2012
    Location
    Montreal, Canada
    Posts
    151
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    Been meaning to get around to making one of those. Great job sir.

  7. #18
    Join Date
    Aug 2013
    Location
    Dunbar, West Virginia, United States
    Posts
    86
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    Just talked about trying to find or build one of these today actually. Decade boxes are $$$$ I'd love to see how you made one

  8. #19
    Join Date
    Dec 2014
    Posts
    2,847
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    I am interested. Let me know if you make some.thanks

  9. #20
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    5,249
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    Quote Originally Posted by Brian Brutus View Post
    Just talked about trying to find or build one of these today actually. Decade boxes are $$$$ I'd love to see how you made one
    If you watch ebay, those decade boxes pop up a dime a dozen. Upgraded a few years back from my old switch type to a rotary for about $15.00.

  10. #21
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    31,456
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    Quote Originally Posted by Chasespeed View Post
    I need to make one of those......


    Sent from my iPhone using Tapatalk
    Me too.

    If you have a parts list for the rotary switch and resistors, that would be good, too.

    Do you get your parts from Jameco?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  11. #22
    Join Date
    Jun 2014
    Posts
    83
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    Thread Starter
    I got most of the stuff from fry's electronics, except the rotary switch which was pillaged from something else.

  12. #23
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
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    I hope Fry's eventually comes to the east cost....
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

    AOP Forum Rules:







  13. #24
    Join Date
    Oct 2009
    Location
    aiken s.c.
    Posts
    227
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    I made one but used toggle switches instead of the rotary switch.Great looking job.

  14. #25
    Join Date
    Oct 2006
    Location
    Ohio
    Posts
    19
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    Nice !

  15. #26
    Join Date
    Nov 2015
    Posts
    10
    Post Likes
    now that's a useful tool!!

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