1 DC Motor Regulator Project

Simple DC motor regulator circuit based on LM1014IC. What this IC does is it maintains the motor speed on both loaded and unloaded by simply sensing the current drawn by the motor. As the motor is loaded, it draws more current; in that case the IC will supply higher voltage to maintain its speed. Closing switch SW stops the motor.
motor speed regulator circuit
TIP42C pinout
Part List:
R1 - 220 ohms 1/4W
R2 - 0.47 ohms 1W
R3 - 15 kilo ohms
POT - 2 kilo ohms potentiometer
C1 - 3.3uF electrolytic capacitor rated 10V
C2 - 470nF
Q1 - TIP42C or similar PNP transistor
M - small DC motor
SW - any small switch


  1. The LM1014 is obsolete. Can you recommend a replacement?