Hot answers tagged

13

Part# BB0054 - Electric, Train 4.5V Battery Car Roof. (But Light Gray in color.)


10

If you want to “turn on and forget” you might want to look into obtaining a circle of old 9V track (metal rails produced by LEGO until 2007) and a power supply, plus a 9V train motor. It will not be cheap (the track pieces, especially curves, won’t be too expensive but a working 9V train motor is a $50-$75 purchase) however it will allow you to turn the ...


9

Most Power Functions pieces will run in classic 9V mode. The IR receiver can't, but motors and lights can. A hacky solution: Many people have done this by cutting up an extension wire, and connecting the two outer cables to their power source of choice. From: Lego PF Hacking – Wire Hacking GND – ground wire – Always connected (0V regardless of ...


9

NiMH batteries only provide 1.2V per cell whereas Alkaline batteries provide 1.5V (nominal values). This means that new/fully charged batteries will provide a total of 9V for Alkaline and 7.2V for NiMH. The EV3 is programmed to show low battery somewhere around 6.2V and turn itself off around 5.5V. There is no option a available to tell the EV3 the ...


8

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 how Wikipedia describes their use as current limiters: When first connected to a voltage source, a large current corresponding to the low, cold, ...


8

The main benefit is consistent performance. The rechargeable battery puts out almost the same voltage until it's almost flat, and whatever current is required with little voltage drop. Disposable batteries have more voltage, but cheap ones can't supply much current. Expensive ones can supply the current, but cost more. You'd be lucky to get 5 sets of those ...


6

Yes, the rechargeable battery box would work. However, if your intention is to avoid expenses, you are better off with buying the IR-receiver, IR remote and the regular battery box rather than the rechargeable one. The rechargeable battery box is no longer available from Lego for quite some time now and is getting expensive on the secondary market as well (e....


5

Update: we made it work, after trying many things, see below. Opened the brick and inspected it for obvious signs of problems but saw nothing. Even tried with the screen disconnected. We tried, as suggested in the comment above, with a firmware update. Even though the brick will stay on for only a few seconds, it was enough for the computer to recognize it ...


4

Yes. The EV3 technically only needs 5V to run. And just the EV3 by itself pulls around 200mA at that voltage. However, motors could be a problem. They can pull up to 1A when stalled, which could overload the power supply. Without knowing the technical specifications of the actual power supply, it is hard to say what it is actually capable of.


4

In case anyone else has this issue - cleaning corrosion off of the connections solved the problem! To clean the contacts, I used white vinegar applied with a cotton-swab/cue-tip. I dried it off with a dry one, left it for about half an hour, and after that it worked perfectly. I watched this video to be sure there wasn't anything I needed to do that I was ...


4

I found this Youtube video Piraka eye replacement and this article on bzpower.com How to Replace the Battery in Piraka Eyes The battery used is a CR927 3V Lithium Battery placed + side up. First, take a tiny flat-head screwdriver and place the tip of it within one of the two inward crevasses on the backside of the piece, and slide the head of the ...


4

The batteries are in series. Which gives (in theory) 6x 1.5 = 9V. Actually it is a little less than 9V as batteries drop voltage a little when they are used. They can drop as low as 1.2 V when they are nearly empty (giving about 7.2V minimum voltage). The motors can make do with as little as 7V so they keep working with nearly empty batteries. The hub most ...


3

Unfortunately after attacking this piece from every angle with some plastic opening tools, I'm quite certain there is no non-destructive way to open this piece. I tried slipping a spudger in every seam where the plastic joins and was unable to find anywhere I could get any leverage, or even push it in more than a few millimeters. Even the jaw piece is held ...


3

Bionicle manas set 8539. Top part from your foto. Bottom one.


3

It's very unlikely to be lead, smaller batteries don't use it. If the batteries were old rechargables they might contain cadmium (NiCd batteries). Most likely what you had was a disposable AA battery which will be an alkaline cell. As you'd guess, you can neutralise that with acid. But not a strong acid - you don't want to dissolve away the metal parts of ...


3

Obviously, if you want to use the train a lot, you will want to use a rechargeable option. You didn't explicitely address this in your question, but even with AAA batteries, you can either use disposable batteries or rechargeable ones. The cost of using disposable batteries can very fast become prohibitive, but rechargeable ones tend to cost more upfront (...


2

Check out Philo's pages for details on Power Functions: http://www.philohome.com/pf/pf.htm Basically, a Powerfunctions cable consists of 4 wires: 9V, C1, C2 and GND. C1 and C2 are also 9V/GND, but output can be controlled by other equipment (such as the IR receiver or the LiPo battery box which has an output power control). The best way to power your lights ...


2

I had the same problem, so I looked at the forums, but I couldn't solve it. In fact it is a problem with the contact, so I put some aluminium foil (the same one from the kitchen) in the positive contacts, and it worked!!! Yeah, I used DuraCell...


2

BuWizz has announced the BuWizz 3.0 Pro which has Powered Up compatible ports. The product page says: Expected Delivery: End of March 2021


2

Don't ever put power-banks in series or paralel !!! They are not plain batteries. Unless you are an electrical engineer that understands the exact circuitry inside the power-banks this is in general NOT safe. Wiring multiple power-banks together can lead to serious problems. Like premature wear on the power-banks or even damaging them completely (as in "...


1

Found the instructions for set 8905 that uses this part. Problem solved: "battery is not replaceable". Disappointed !


1

Assuming that your motor already has a Technic axle available, you'll need: Any Technic motor. You probably want an M motor (8883). An appropriate battery box or other power source. If you selected the above motor, you probably want the PF battery box that uses AA batteries (8881). Any Technic elements that you want to actually mount the motor onto the V6. ...


Only top voted, non community-wiki answers of a minimum length are eligible