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4 votes

How to run Power Functions LEDs from a 12v supply?

https://www.philohome.com/pf/pflights.htm So the leds draw 2mA, a voltage drop of 12-9 = 3 V is required. So Ohms law says you need about a 1.5 kOhm resistor in series to have the leds shine at the ...
Michael Verschaeve's user avatar
3 votes
Accepted

How to convert Passenger Train 7745 from 12V to Powered-Up?

I would suggest placing the Powered Up hub in the front vehicle, replacing the brick-built 'engines' and 12v weights. Parts required: Two 1x4 plates with two studs (no. 92593) in any colour; Two 1x8 ...
john_e's user avatar
  • 403
3 votes

12V LEGO train tracks splinter

While I can't speak of the handling of these parts, the possibility of receiving official replacement parts from TLG is surely zero. That leaves us only the second-hand market, which fortunately ...
zovits's user avatar
  • 16.2k
2 votes

Are the blue and grey 12v train system compatible?

The answer is yes. Using the 13v~ (alternate) output of the grey line transformer you can command the blue line switches. This is not in the manual of the new transformer (it is a kind of hidden door ...
Pedro Quaresma's user avatar
2 votes

Lego 12v motor axle repair

It's difficult to answer definitively without a photo or video of the issue, but I'm not aware of a way to easily get replacement parts for this. I'm sure you're already aware that you can buy a ...
jncraton's user avatar
  • 40.3k
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
  • 40.3k
2 votes

Repairing a 12V switch motor

Just repaired one... https://youtu.be/XGyY8KtDnfA Pry it open by using a precision knife on the lip of the bottom, using care to not damage the case: Inside you'll find a coil of copper wire. Check ...
DOUBLE 'O' PRODUCTIONS's user avatar
2 votes

How to convert Passenger Train 7745 from 12V to Powered-Up?

My first instinct would be to replace the train weights in the locomotive with the battery box: That will require a little reworking of the walls to be 1-wide throughout so the battery box can be ...
jncraton's user avatar
  • 40.3k
2 votes
Accepted

4.5v/12v connector contact problems

At least with 1980s grey cables, the pins on the plugs are split, and if the four segments of the pin get pushed together the connection becomes loose. Gently easing the segments apart with the tip of ...
john_e's user avatar
  • 403
1 vote

How to run Power Functions LEDs from a 12v supply?

using the numbers on the page that Michael linked to, I calculate 1mA per LED which is very low. When increasing the voltage to 12V I calculate 1.7mA per LED which is of course 70% brighter but still ...
user253751's user avatar
1 vote

How can I repair a red 12v train motor from Set# 7730?

According to Bricklink, Set # 7730 has this motor : bb12va Electric, Train Motor 12V Modern Type I with 2 round contact holes For disassembly and repair you can look at this large post with ...
Syberion's user avatar
  • 12.6k
1 vote

Can I use the old 4.5V and 12V blue/gray era rails with newer trains?

As I have a 3D printer I just printed up a number of track adaptors like this. It works well. The print files are available free from "Thingiverse".
Quorneng's user avatar
  • 221
1 vote

What was the 12v AC socket for on the 7864 transformer?

The AC output might be useful for blue era switch points. I guess this is how the transformer is built:
Niels's user avatar
  • 1,162

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