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tamiya dual gear box voltage

 i have a tamiya dual gear box.  and i dont really know what voltage i should run them at. some people say 3v others say 6v.

so i have come to you guys for help!

 i want to know what voltage you guys run them at and if you have fried any motors? 

 

the one i have looks like this https://www.sparkfun.com/products/319

(-:

 

 

inverted switch

is there anyway i can make something turn on when i open a box without it beiong on constantly to check if it is open? 

the box opens sort of like a hinge but there is nothing that touches when open that doesn't touch when closed

thanks :)

 

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Building plans for the tamiya tiwn motor gearbox

I built my gearbox in the wrong configuration, it was 3 months ago and I lost it... Does anyone have a JPEG a PDF or anything else of the plan for that gearbox ?

 

70097

Tamiya part number.