Welcome!

   I present you a simple analog yet powerful, up to 40A constant current (with cooling it can handle even higher currents, think of watercooling it in boats) one-way speed controller for brushed motors.
   The device presented here is not my own design, I am not an engineer with the knowledge to design a device like this. I chose this one from an old book because it was pretty easy to build, and uses cheap and easy to find, very common components. This ESC (like most others) is built up using N-chanel power MOS-FETs because of their good characteristics (low S-D resistance).
   One of the drawbacks of this controller is that it is a one way controller therefore not ment for R/C cars or boats where backward run is needed. It is rather an R/C airpane speed controller.
The other drawback is that it has no BEC circuit and you must add extra batteries for the receiver and the servos. You may use the same battery pack that powers the motor for powering the receiver when using low cell count or can use a BEC Eliminator circuit. At the same time the 4N25 optocoupler used in the device separates the Controller from the Receiver. This way eliminating all possibble interferences caused by the electric motor and protecting the receiver from possible malfunctions of the controller itself.
   The input operating voltage of the device goes from 7.2 to 19.2 Volts, from 6 to 16 cells.

   As it is too hard to translate the theory the controller works (as the original text is written in Hungarian) I rather present you the schematic diagram, the components layout, the PCB layout, the components list, some pictures of my own ESC and provide you with other useful information.
   I hope you find these pages useful and I wish you good luck in your work! If you need help, have comments or suggestions, you can contact me here.

   For easier navigation you can use the at the top of each page.

Schematic diagram	Components layout	PCB layout (GIF)	Pictures