Zweikanalschalter für UAA170 (statt 1x 16, 2x 8 LEDs mit UAA170 steuern)

Most drill speed controllers suffer from one or more drawbacks. These include poor speed stability, excessive instability at low speeds, and high power dissipation in the series resistor used to sense motor current. The circuit described here suffers from none of these drawbacks, and in addition is extremely simple.