This speed controller was cheapish, but also has a constant fan, its modular so you can add speed controllers to add drive wheels and split the load really quickly leaving each esc to look after each pair of wheels.
I wanted to over volt so its range of 7v - 45v was perfect and 60 amps i did think would be enough constant.
I looked about but for the money i couldn't beat these... So i bought 2 they have a lot features i like... since i am learning and scooter motors are not going to kill it, it works extremely well with a DX6i.
There will be a few that think its underrated i'm sure, but its not my long term ESC, i am planning on other bots this is my learning curve bot. I'll spend much more money WHEN i have some experience
http://www.robotshop.com/uk/smartdri...or-driver.html
I am no expert mind, like you this is a trial and error experience !





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