ELECTRIC FLIGHT SPEED CONTROLLER Mk1

A very small and simple speed controller utilizing 
the ZN409 IC, and some of the now relatively cheap power Mos-Fet transistors. 
The design has given good service at a low cost, and is even being used
in electric powered helicopters.

by Ken Hewitt

Originally published in the September 1994 issue of
Radio Control Models and Electronics

ken@welwyn.demon.co.uk