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Throttle Control with External Transformer

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  • Member since
    October 2023
  • 2 posts
Throttle Control with External Transformer
Posted by kbisignani on Sunday, October 8, 2023 9:27 PM

Greetings,

Because of "reasons" (that may or may not be OCD related), I have always liked the idea of a control panel with all my switches and dials on a single board.  My issue has always been the throttle, because that's pretty much tied to a big clunky power pack.

I've decided I have three options to resolve this:

  1. Dissasemble a power pack and mount it under the control panel, with the throttle sticking through the board.

  2. Use some form of transformer and wire it to some form of throttle control.

  3. Get over my OCD and just glue a power pack on top of the control panel.

 

For years (a lot longer than I care to admit), I've dreamed of option 2.  But my electronics background is a bit non-existant.  I stumbled on this little guy on Amazon (https://www.amazon.com/Converter-DROK-Regulated-Adjustable-Regulator/dp/B098347BD9/) and figure if I wire in a transformer that's in the 12v range, it'll happily control my locomotives.

But... I need an second opinion.  Would this work the way my brain envisions it?  Or is this a terrible idea and I should feel bad for even thinking it?

 

Thank you for any input!

  • Member since
    February 2002
  • From: Mpls/St.Paul
  • 13,776 posts
Posted by wjstix on Monday, October 9, 2023 9:30 AM

You could build a control panel with a support behind it for the powerpack - sort of like a cradle it would sit in - so the top of the powerpack is level with the face of the control panel. Would kinda depend on the shape of the powerpack I guess.

Otherwise, RadioShack makes/made a 25-ohm rheostat. You could connect that to the output of the powerpack, and mount the rheostat knob on the control panel's face, along with a DPDT center-off toggle for direction.

When I was in DC I made a do-it-yourself tethered walkaround using that rheostat and toggle in a small RadioShack project box. I found a center-off toggle worked best. With a very efficient can motor just enough power trickled through when the rheostat was all the way down that the engine might still be trying to move. However, if your engines have a 'constant lighting' circuit, that trickle might be just what you need.

 

Stix
  • Member since
    January 2004
  • From: Canada, eh?
  • 13,375 posts
Posted by doctorwayne on Monday, October 9, 2023 11:14 AM

I have a Control Master 20 for the power, but use a walk-around throttle, (Varipulse from Ken Stapleton) with 6 plug-ins on the layouts facia, and a springy 16' cord, which allows me to follow along with whatever train I'm using.

 

This might not be useful for a larger layout, with multiple trains running, but it suits my lone operator layout.

Wayne

  • Member since
    September 2003
  • 21,357 posts
Posted by Overmod on Monday, October 9, 2023 4:24 PM

In my opinion, he should learn to solder, to where he's comfortable making electrical joints.

Then he should carefully remove the rheostat and any desired switches from the front panel of the powerpack box, lengthen and insulate the leads appropriately, and install them in an appropriately labeled wire faceplate that bolts to his panel.  (The cheap way would be to cut off the top of the powerpack, use that as the 'plate', and make the wires longer to fit.)

  • Member since
    October 2023
  • 2 posts
Posted by kbisignani on Wednesday, October 11, 2023 11:59 PM

Thank you all for your replies.  Some interesting ideas, and I see I have more homework ahead of me.

@Overmod, you make an interesting point.  Let me ask, do you think other methods wouldn't provide the same power or control of the locomotive?  This was the first idea I had, but dismissed it as I've always thought pre-made power packs were never as robust as a DIY solution.  But I don't have any data to back that thought up.

And @wjstix, I'm still sad RadioShack is gone.  I still remember getting the catalogs in the mail and pouring over the various electrical components dreaming about the wonderous inventions one could make with the myriad of components...

  • Member since
    March 2011
  • 1,950 posts
Posted by NVSRR on Thursday, October 12, 2023 9:23 AM

MRC has handheld controllers of what you seek.  So before taking a prt a power pack look for those,   They ran off the fixed dc current connection on the back of the power packs.  

A pessimist sees a dark tunnel

An optimist sees the light at the end of the tunnel

A realist sees a frieght train

An engineer sees three idiots standing on the tracks stairing blankly in space

  • Member since
    May 2008
  • From: Miles City, Montana
  • 2,250 posts
Posted by FRRYKid on Friday, October 13, 2023 2:13 AM

While it may not quite meet with what you're going for, what I did was build a shelf attached to my vertical control panel. (http://photos.app.goo.gl/cPQBAkib7Qc1hQeE9) When I first built the base for this layout, it was in my apartment's main bedroom and the panel was built as a space saver. It keeps the power pack close and I also have the mobile throttle I can use as well. (This is an old picture. I have since removed the hobby transformer and installed a door bell transformer unit to power all the lighting on the layout.)

"The only stupid question is the unasked question."
Brain waves can power an electric train. RealFact #832 from Snapple.

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