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8 votes
Accepted

Classic 9V battery box current limiter?

The short answer is about 150mA. Electrical Characteristics From the limited testing that I've done, the component you pointed out appears to be a positive temperature coefficient thermistor. Here's ...
jncraton's user avatar
  • 40.6k
6 votes

Looking for older conducting train tracks

Such place indeed exist and it is called Bricklink, a website dedicated to trading LEGO items. It has extensive history and great catalog of LEGO items found on the internet. Prices and quality are, ...
Alex's user avatar
  • 23.2k
6 votes

Electric train set not working - even though the light is on

The speed regulator light being on is a good start. It looks like you have things set up correctly as far as I can tell. The first step is to identify which part is having issues. All of these parts ...
jncraton's user avatar
  • 40.6k
4 votes

Electric train set not working - even though the light is on

If there is a suspicion that the metal surfaces have developed dust and grime or any other insulating layer, a solution would be to give the tracks a Brasso (or other metal polish) wipe and quick ...
Tom Hofman's user avatar
3 votes

Getting more tracks for 9V trains

LEGO doesn't make tracks that can conduct electricity anymore, so to get more you have three options: 3rd party manufacturers - I know there are companies making curved track for larger curves than ...
Henrik supports the community's user avatar
3 votes
Accepted

Repairing disintegrated old 9V wire

MindS1 is correct that in terms of electrical properties you don't need to be terribly picky. As you noted you will want multicore wire to allow for flexibility and prevent breakage. I'd also add ...
jncraton's user avatar
  • 40.6k
2 votes

Repairing disintegrated old 9V wire

You don't really need to worry about the wire gauge for Lego parts. This source indicates that only the beefiest lego motors breach 1A, and even then, only while completely stalled. Most of those ...
MindS1's user avatar
  • 1,392
2 votes

Getting more tracks for 9V trains

If your problem is obtaining more tracks suitable for 9V lego trains, one option is to use copper foil tape to electrify currently available tracks. Chris Meyer wrote a lengthy article about this, so ...
IvanSanchez's user avatar
  • 8,977
2 votes
Accepted

Can 9V train motors be linked and work together via the top power stud connection?

The basic premise of your idea is sound: the metal-wheeled train motor can indeed receive power from the track and forward it to the studs on top of it. Then an extension wire can be used to power ...
zovits's user avatar
  • 16.6k
2 votes
Accepted

What is the maximum voltage for motors from Cybermaster units?

I don't have this set, so I can't provide a fully authoritative answer, but 9V is likely to be safe for these motors. The hub that drives them is definitely 9V, as it connects with the rest of the 9V ...
jncraton's user avatar
  • 40.6k
2 votes

9v Regulator Power Question, 1 enough or multiple?

It is never a good idea to electrically connect two regulators to the same piece of track. You could damage both of them! I assume you are referring to voltage drop (and thus reduced power when the ...
Quorneng's user avatar
  • 221

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