Monday, September 15, 2014

Simple Circuit Schematic Low Voltage DC Motor Speed Control using TDA7274

Eltronicschool. - Sometime we need low voltage or low power capacity to control our DC motor. In here we will show you simple circuit schematic that based on TDA7274 for Low Voltage DC Motor Speed Control like in figure 1 below.

Circuit Schematic

Figure 1. Circuit Low Voltage DC Motor Speed Control (

Component List
  1. R1 = 220 ohm
  2. R2 = 2K ohm
  3. R3 = 10K ohm (Variable Resistor)
  4. C1 = 4.7 uF
  5. C2 = 1 uF
  6. IC1 = TDA7274
  7. Vs  = 1.8V - 6V


Circuit schematic like in figure 1 above is Low Voltage DC Motor Speed Control using TDA7274. According circuitstoday site describe that The IC TDA 7274 is a monolithic integrated DC motor speed controller intended for low voltage/ low power applications. Built in internal voltage reference voltage, wide input voltage range (1.8 t0 6V), high linearity, 700mA output current, excellent temperature stability etc make this IC well suitable for almost all low power DC motor speed control applications.

Completed that The motor to be controlled is connected between pin3 (Vs) and pin4 (output) of the IC. Resistor network comprising of R1, R2, and R3 is the section that deals with the speed control. Control pin (pin8) of the IC is connected to the junction of R2 and R3 and the speed of the motor varies linearly according to the position of POT R3. Capacitor C1 rectifies the fluctuations in motor speed and capacitor C2 cancels the motor spikes.

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