## How did they convert ac to dc current on electric train transformer when they didnt have transistors then?

Question by modah: How did they convert ac to dc current on electric train transformer when they didnt have transistors then?

They would use a diode that would handle enough current.

What do you think? Answer below!

## How do I convert a Model train locomotive to a dummy unit?

Question by : How do I convert a Model train locomotive to a dummy unit?
i have a HO scale locomotive and the engine wont work. I want to convert it to a dummy. It is a steam engine. I removed the engine, but its wheels don’t turn like a dummy units, and my working engines can pull it. so how do i do it, the CORRECT way?

More than likely the side rods are out of synchronization. When you removed the motor did you take off the wheels? Once the side rods are out of sync you might as well set it off to the side as a static unit. I had to do that and wound soldering the drivers to an isolated section of track.

## A transformer is used to convert 120 V to 15.7 V in order to power a toy electric train.?

Question by : A transformer is used to convert 120 V to 15.7 V in order to power a toy electric train.?
If there are 214 turns in the primary, how many turns should there be in the secondary?

use V1/V2 = n1/n2

where V1 = 120 V, V2 = 15.7 V, and n1 = 214 turns

so n2 = n1 V2/V1

…… = 214*15.7/120

n2 = 28 turns, number of turns in the secondary

Hope this helps

## A step-down transformer is to be used to convert an ac voltage of 120V to 6V to power an electric train.?

Question by : A step-down transformer is to be used to convert an ac voltage of 120V to 6V to power an electric train.?
If there are 300 turns in the primary coil, how many turns shoud there be in the secondary coil?

You need to work with the fact that Voltage Out/Voltage In = Turns in 2nd coil/turns in 1st coil.

Using that, you can sub in the numbers to get:

6/120 = x/300

Rearrange to find x, which is the number of turns in the secondary coil

What do you think? Answer below!

## Model trains: How to convert analog 4-4-0 Southern Pacific loco to DCC??

Question by almintaka: Model trains: How to convert analog 4-4-0 Southern Pacific loco to DCC??
Hi everyone,
I have an HO scale analog 4-4-0 Southern Pacific locomotive that I would like to convert to DCC. I understand the basic electronics required for an encoder car behind the engine, but I keep hearing horror stories about people who build the encoder “by the book” but then have major vibration problems with the engine running at slow speeds or stopped. Has anyone out there come up with a good way to build an encoder that reduces or eliminates engine vibration?

Thanks to all for taking the time to read this. Have a good day !!!
Big Al Mintaka

Al, I’m not pretty sure you don’t need to house the decoder in a separate car. I model N scale, and though I don’t use DCC, many of my friends do. I’ve seen the sizes of decoders available today and a Digitrax DN140 will fit in almost anything. If I remember correctly, it’s about the size of a dime or smaller! That will hide away very easily inside your tender.

As for you vibration question, I’ve never heard of a decoder causing this. As model railroaders, we all know how delicate steam locomotives are. Even with careful handling, sometimes things happen. When taking one of these apart for any reason it is extremely important to take extra care with extreme attention to detail in order to have a smooth running steamer when finished. I can only conclude that during the “up-fit” process, some minor detail has been rearranged slightly causing a vibration.

Hope this helps…my email is yahoo verified if you wish to contact me…good luck

## A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns

Question by Australianhotti: A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns
A transformer is used to convert 120 V to 8.6 V in order to power a toy electric train. If there are 260 turns in the primary, how many turns should there be in the secondary?

The voltage ratio is the same as the turns ratio. So the easiest solution is:
120/8.6 = 260/X whoops I got the X on the bottom, no problem
8.6/120 = X/260 and X = 8.6*260/120
= 18.63 turns
actually you would probably put 19 turns as a practical matter.

## Can I convert an HO scale passenger train so that its interior lights up?

Question by VGFan: Can I convert an HO scale passenger train so that its interior lights up?
I recently purchased an HO scale Metrolink and was able to get it open and glue some sitting figurines in some of the seat, they are difficult to see and was wondering if I would be able to add lights to the interior of the passenger cars. If this is possible could you possibly post a link to some auctions on eBay that have these for sale. Even a store website link would be great just so I know what it is exactly that Im looking for.

Simple answer – install a D cell or a couple of AA’s and put a couple of white LED’s along the roof. The 1.5 volt batteries can run LED’s without current limiting resistors. Switch in bottom or open to turn on and off.
Messier answer: change out the trucks (unless the Metroliner cars are already self propelled.) to insulated axles with conducting wheels to provide power from the tracks to the car. Collect the power, regulate it, buffer it, and feed it to grain of wheat bulbs or LEDs.

## A step-down transformer is to be used to convert an ac voltage of 105 V to 6 V to power an electric train. If?

Question by steve00878: A step-down transformer is to be used to convert an ac voltage of 105 V to 6 V to power an electric train. If?
A step-down transformer is to be used to convert an ac voltage of 105 V to 6 V to power an electric train. If there are 420 turns in the primary coil, how many turns should there be in the secondary coil?