Author Topic: Need help finding resistor test box post  (Read 383 times)

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Allegheny

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Need help finding resistor test box post
« on: October 14, 2019, 11:14:12 AM »
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I need help finding a post that showed how to build a resistor test box for LEDs.  I did a search and couldn't find it.  Also, I'm not sure it was on this forum, but I hope the collective forums brain power can help me find it.
The post I'm looking for is NOT Peteski's "Build your own (cheap) LED tester" or DKS' "LED/Small Motor Tester/Evaluator"
The one I'm looking for used a rotary switch connected to various resistors in a project box with Radio Shack binding posts to connect power and LEDs.  The writer also posted two home drawings of resistors values to use around the rotary switch as well as a wiring schematic. 
Does anyone the discussion I looking for?
“Even if you are on the right track, you’ll get run over if you just sit there.”
― Will Rogers

wvgca

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Re: Need help finding resistor test box post
« Reply #1 on: October 14, 2019, 12:07:27 PM »
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it may be easier to just buy a resistor decade box from ebay, or others ...
they are only ten bucks or so, and already come in a box  ..
they will have a good selection for you to choose from ..

peteski

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Re: Need help finding resistor test box post
« Reply #2 on: October 14, 2019, 02:29:30 PM »
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I guess you didn't scroll down enough to see that the item you are looking for is mentioned in my "cheap LED tester" thread. See reply #11 in
https://www.therailwire.net/forum/index.php?topic=46039.0  It is built by DKS.
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Allegheny

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Re: Need help finding resistor test box post
« Reply #3 on: October 14, 2019, 03:50:30 PM »
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Peteski
It wasn't David's post.  There a different one that showed a picture of the resistors soldered to the rotary switch.  I believe there were red/black binding posts at the top/bottom of the project box for power/LED connections.
Allegheny
“Even if you are on the right track, you’ll get run over if you just sit there.”
― Will Rogers

peteski

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Re: Need help finding resistor test box post
« Reply #4 on: October 14, 2019, 05:45:24 PM »
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Peteski
It wasn't David's post.  There a different one that showed a picture of the resistors soldered to the rotary switch.  I believe there were red/black binding posts at the top/bottom of the project box for power/LED connections.
Allegheny

I don't recall any other trst boxes with resistors.  Maybe someone else will recall it.

But DKS's circuit is exactly just bunch of resistors soldered to the rotary switches.  He just added batteries to make it is self-contained for testing LEDs.



It is a really simple circuit.  If you just want resistors (with no batteries), just eliminate the battery section from David's circuit.  So one lead will come out from the center wiper of the lower resistor rotary  switch (exactly as shown on the diagram), then the other lead will be attached to the wire junction (shown as a dot) to the left of the 270 ohm resistor. Then anything else (the battery circuit) to the left of that junction will be eliminated.

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Allegheny

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Re: Need help finding resistor test box post
« Reply #5 on: October 14, 2019, 09:57:04 PM »
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Peteski
Since the post must be pretty obscure, I'll modify DKS' wiring diagram with 10 or 11 resistors ranging from 220-22K ohms for my project.
Thanks.
Allegheny
“Even if you are on the right track, you’ll get run over if you just sit there.”
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craigolio1

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Re: Need help finding resistor test box post
« Reply #6 on: October 15, 2019, 07:57:35 AM »
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I don't recall any other trst boxes with resistors.  Maybe someone else will recall it.

But DKS's circuit is exactly just bunch of resistors soldered to the rotary switches.  He just added batteries to make it is self-contained for testing LEDs.



It is a really simple circuit.  If you just want resistors (with no batteries), just eliminate the battery section from David's circuit.  So one lead will come out from the center wiper of the lower resistor rotary  switch (exactly as shown on the diagram), then the other lead will be attached to the wire junction (shown as a dot) to the left of the 270 ohm resistor. Then anything else (the battery circuit) to the left of that junction will be eliminated.

I want to build this. I don’t even think I need it. I just want it.