After comparing my spec1 PCB with that of spec2, I found that there is no much differents between them. Most major components look the same, except that some fets are integrated into 1 componets. But the most important thing that we concern is the component controlling the motor.
What I discovered is the IC: 1638
http://service.semic.sanyo.co.jp/sem..._e/LB1638M.pdf
which is a kind of "Bidirectional Motor Drive" IC. Both spec1 & spec2 PCB use this IC in controlling the rear motor and the servo motor.
Because of my limited knowledge in electronics, I am not quite sure how much current it can draw to the motor? (becoz i would like to modify the whole PCB into my another RC car which using mini4wd motor, but don't know whether it can withstand such a high current or not.......)
Will stacking one more of this IC works?
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I think the guy "MicroRCracer" is stacking one more LB1638M onto the original PCB in order to increase the maximum current it can through to the motor. I don't think that this is anykind of trading secret and I would like to share what I discovered to everyone in this forum.
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