Let's Make Robots!

finding cheap RC ESC (speed controller)

I love RC ESCs. They are electronic speed controllers that you connect to a servo output on a RC receiver or a micro controller, and they give you full step free control over a big motor in both direction. Most of the ones made for RC cars work in the voltage range 6-8.4Volts, but there are several alternatives for people who plan to run up to 24 volt motors in almost constant stall at a gazzilion amps (read robot war contenders).

But I'm the eternal cheapskate, and wants the cheapest there is.. So far I've found this 

http://www.spikenzielabs.com/Catalog/index.php?main_page=product_info&cPath=22&products_id=130

It costs $19 and comes as a kit, so I guess I have to solder it myself. Do any of you know of any cheaper ones?

My wanted specs are:

  • run in both direction (not plane type)
  • for brushed motor (not brushless)
  • cool if it has BEC (can supply regulated power for RC receiver or Microprocessor)
  • without break function (racing ESCs will stop the wheels if you go from full forward to full reverse)
  • really really cheap (since I need 4)
  • around 7Volts (I'm not fuzzy)

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Turnigy

There are 9 pages of controllers.

I scanned all 9 pages, but they all describe their Throttle curve. That usually indicates that it's made for planes which throttles not cars/robots with reverse.