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LED Light testing How-to & Homemade testers
Posted by desertdrover On 03/19/2018 At 3:45:11 PM
There are many questions from Forum members on how do I test an LED. Here are four (4) How-to ways to accomplish this task. Depending on your needs or skills these are some pretty simple ways to get the job done. Starting 1: with a Digital Multimeter, 2: using 9 Volt battery with 1K Ohm resistor in-line homemade tester, 3: using two (2) double ďAĒ batteries, or 4: a nifty little gadget from Ngineering using a Nine (9) volt battery with a circuit board with installed resistors for testing LEDís.
Starting with the use of a Digital Multimeter, connect the Black test lead to the COM jack and the Red test lead to the Note that the polarity of the Red test lead is ď+Ē).
Set the meter Function switch to the range (see picture below) and connect the test leads across the diode/LED. If the LED does not light, switch your red and black leads on the LED. When the LED lights whatever black lead clip is on your LED leads will be your (-) Neg. Cathode lead and that is where your resistor will be placed when installing into your Locomotive, Rail Critter, Structures or any LED lighting situation.

Second method using a homemade 9 Volt battery with 1K Ohm resistor in-line homemade tester. Get a set of red and black wires on a 9 volt battery snap on clip, and place an LED holder, or red and black alligator clips, on the other end of the red and black wires. Place a 1K Ohm resistor in-line on the black wire. To test an LED, place the LED into the LED holder, or use your alligator clips, and again if it lights, note what lead the black wire goes to on the LED leads, and that is your (-) Neg. Cathode lead and where your resistor is attached.

Third method using a double ďAĒ battery case with two (2) double ďA batteries homemade tester. Attach a set of red and black alligator clips to the battery case red and black wires. (No resistor needed for this tester) Connect your LED to the tester clips and again, if it lights, note what lead the black wire goes to on the LED leads, and that is your (-) Neg. Cathode lead and where your resistor is attached for when you install it into your locomotive decoders White (Forward) or Yellow (Reverse) light leads.

The last LED tester is a device made by Ngineering, Part #N8021, for testing LEDís, nothing more than the same as your homemade second tester using a nine (9) volt battery and resistor. This device already has a resistor installed into a circuit board with nice convenient attachment clips for your LED leads. And same as all the other testers, the black lead shows your (-) Neg. Cathode lead and where your resistor gets attached prior to installation.

Also posed into the DCC, Computers and Electronics for Model Railroads
"Natural" Porch Posts
Posted by TC On 03/17/2018 At 11:14:13 PM
I'm looking for some creative ideas on how to model (in 1:87 scale) porch posts similar to the ones in this photo by Dorothea Lange (found at this Wiki link) taken by her in Gordonton, North Carolina. Anyone have thoughts on how to approach it?

Another Photo Run-By at the F&SM RR
Posted by halrey On 03/17/2018 At 6:36:57 PM
Well, I made another photo run-by at the F&SM RR two days ago. George has replaced some of the older buildings that had been built in a rush with some new structures. The restaurant with the pawn shop are a Downtown Deco kit, while the other 2 are scratch built. The fish company bldg. covers a turnout motor.
Always new improvements every time I stop by, got to love it!


Grandt Line Closing
Posted by GregW66 On 03/14/2018 At 12:55:38 PM
I got a tip on Facebook that Grandt Line is closing. Hoping to get the word out so someone might pick their line up.
Larena's Railroad Hotel
Posted by Adamantish On 03/12/2018 At 10:15:15 AM
Hi everyone. I intend to build this kit as my first craftsman kit. It doesn't look too complicated from a construction standpoint. I went to a local train show this past weekend looking for some kits under $20 and picked up this Muir Models kit. I have no idea how old it is. 1980? 1970? I did a quick box check before I bought it and all of the major wall pieces were still in a sealed bag. Somehow, I neglected to notice the instructions are missing. Oops. I don't suppose anyone has this kit in their collection, or maybe you've built it, and could share some photos of the instructions or completed kit? I think I can build it with or without the instruction but I'm sure they'd be helpful.

One of the reasons I think it's buildable without the instructions, all the walls, windows and door openings are pre-scribed. The biggest challenge will be figuring out where the small bundle of strip wood goes. I got all of the walls cut out yesterday.

I'm thinking about mocking up a dormer on the front left, and maybe 2 on the back. If this is a hotel it seems like it should have more usable space on the second floor.

I'll post more photos as I move it along.

Photos of my favorite builds
Posted by Graffen On 03/09/2018 At 2:44:33 PM
Some of my favorite builds in HO/HOn3.

Coach in HOn3

Combine in HOn3

Caboose in HOn3

Boxcar HOn3

Paper model scratchbuilt.

Miller & sons diorama.

Station close up.


20 t Shay in HO

Bi-level station

Gas station

Leadville building in HO

Modified Lindbergh tug in HO

Weathered brass C-19 in HOn3

FSM engine house for HOn3

Scratchbuilt paper model in HO

Roundhouse for HOn3

Sierra Hotel in HO

Detailed and weathered Swedish Sb locomotive in HO. (Tenshodo)

Drugstore in HO

Store in HO

Auhagen building

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There are 145 signatures
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 Posted By: Art H. 
I'm new to forums & such so bear with me. Also rying to re-enter railroard modeling. I would be interested in talking to someone from the HOn3 module group in Pittsburgh, Pa.
Signed: 3/26/2012 11:06:54 AM
 Posted By: ward kesic 
Signed: 2/18/2012 2:15:44 PM
 Posted By: Dwight 
Does anyone know what could be used to make a hinge that would allow a very small HO scale door to open 180 deg.It's only 18"W x 36"H.
Signed: 2/6/2012 1:15:47 PM
 Posted By: ali alamedy 
Dear All ,

I tried to join your great forums many time ,but unfortunately I didn't receive the confirmation mail ,So can anybody tell me if there is any rules or specific age or nationality to join this forums ,Please its so important to me to join this forums cuz I did a lot of railroad stations scale models 100% handmade by me and its mean alot for me to hear your opinion about it .

Many thanks and best regards

Signed: 1/8/2012 3:16:29 AM
 Posted By: rod n eye 
Woodland Scenics BURNS !!!! Thursday 1/5/2016 Linn Creek , Missouri Big fire !! No one hurt !! ....but great damage !! Over 150 people without a place to work tomorrow !!!
Signed: 1/5/2012 11:05:50 PM
 Posted By: boxcarbill 
Hi Everyone,I'm new to this computer chatting. I don't know how to post pics of my portable on30 layout. Because I live in a apartment, & don't have room or place for permanent,stand alone layout. I decided to make a aluminum box that measures 4ftx6ft when open & 2ft x 6ft when closed. I'm modeling a fictitious hawaian sugarcane operation.
Signed: 12/23/2011 3:11:04 PM
 Posted By: Frank Hermanek 
I'd like to find the article #19991 to enhance the size/appearance of the Bar Mills brewery. How do I get it it? I am an NMRA member. Please help


I don't see an image format
Signed: 10/20/2011 7:35:15 PM
 Posted By: brook jacobs 
gentlemen i have a 14 inch tall round stove which has the letters NM&Tco buffalo n\NewYork on the top of its lid I was wondering if this is a stove which would be connected to the railroad in your neck of the woods? the only connection to the letters on the top is the NM&Tco railroad in the Appalacias any thoughts would be appreciated
Signed: 8/18/2011 10:14:16 PM
 Posted By: Andy 
good info
Signed: 4/29/2011 8:02:32 PM
 Posted By: Bob Holden 
A neat site...I'm in the process of rebuilding my HO layout...it was dismantled for moving. The SLO&WRR (St. Lawrence, Ontario & Western Railroad) should be up and running again by year's end. Love the pictures...hope to contribute in that area!
Signed: 4/25/2011 2:00:04 PM
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