hello all

short buy a set lego 8043, I have to say is wonderful, but I wanted to increase the voltage from 7.4v to 9.6v the battery box using 8 AA batteries.

my question is: the 8 batteries I put on one of these:

http://www.sintel.biz/open2b/var/catalog/l/9693.jpg

Then I put a switch. all I need, such as fuses or resistors?

I edit it with the 8043 version completed, so there will be at the end 5 M motor and 1 XL motor, and 3 IR receivers.

thank you very much

@ leo81: rien posted this Eurobricks topic about Lego "Power Functions on 11.1V" RC batteries. There is extensive discussion about the maximum voltage that PF components can handle. If you are running Power Functions on 9.6V, you should be fine. You don't need any fuses or resistors; the PF Receiver provides the protection.

If you are going to run all of those motors, you will need more than one battery pack. Read the Power Functions "Frequently-Asked Questions" (FAQ) webpage:

"Q2: How many Power Functions Motors can I drive from one Power Functions Battery Box?

A2: As a rule of thumb, you can drive 2 Power Functions XL-Motors, 3 Power Functions Train Motors or 4 Power Functions M-Motors at the same time from one Power Functions Battery Box. If you wish to run a combination of motors, you can e.g. have 1 XL and 2 M running together. The XL-Motor requires about twice as much power as the M-Motor. The Battery Boxes and the IR Receiver have overload protection, so attempting to drive too many motors will not damage anything. The power a motor consumes depends on what function the motor is performing. Motors will operate best when driving a small load."

Q12: What happens when the Power Functions overload protection kicks in?

A12: Overload protection is activated when too much power is consumed from either a Power Functions Battery Box or the IR Receiver. This can happen when a motor is blocked or when too many motors are running at the same time. If overload protection is activated, the Battery Box or the IR Receiver will cut off power to the output until power consumption has dropped under the allowed value. To regain power, unblock the motor or disconnect motors from the output – then turn the Battery Box OFF and ON again. Under overload protection, the green light on the Power Functions Battery Box will still be ON.

Edited August 3, 201113 yr by DLuders

ok perfect, so i need:

- 8 AA 2000mah

- 1 battery box as show before

- 1 switch

i think that with 9.6v ond gears oiled, the 8043 function good :) or i necessary i can add another AA, so in totae 10.8v

You can run 4 ea. PF Medium motors or 2 ea. PF XL motors on one PF battery box. If your MOC has 5 ea. PF Medium motors AND one PF XL motor, you will need two Battery Boxes.

i will use Jurgens 8043 mod, and he use 1 battery box 8878 for 6 motors..

You'll only need two battery boxes if you use all of the motors at the same time.

but sorry, he use olny 8878 and the 8043 work perfectly, as you can see here:

isn't correct?

It does not matter too much how many volts the battery pack produces, as long as it can produce enough amps. The 8878 does produce enough amps; it works well.