This is really small speed controller build under AT90S2343 microcontroller.

It can be used on very lightweight model like RC plane. Controller simply ramps up or ramps down motor speed depending on buttons are being pressed. If no button press is detected then controller ramps motor down to a stop in order to prevent model fly out of transmitter range.

Controller itself weights about 0.3grams and it size is 9×12mm. It is capable to drive 1.5A motor by using an IRLM2502 mosfet. All files are provided if you want to build it by yourself, or you can buy one for few Euro’s if you don’t want to mess with soldering.