Transistor as a motor driver

The more current that flows through Ib , the more current will flow through Ic , theoretically. The current Ic is proportionately dependent on the value of Ib ; it's translated to the following formula:. How much gain does the transistor has? It depends. It's not a one constant number. It varies on conditions such as temperature, collector current, etc. A few results under certain conditions can be found on the datasheet. But let's use the HFE measurement tool from the multimeter to find out an approximately value.

Connect the transistor to the collector, emitter and base sockets of the HFE measurement. The mode selector will vary from multimeter to multimeter. In order to secure a good switching mode of the transistor. Multiply the Ib by 5 times. Let's find it out:. How big should be resistor Rb to allow just 0,66mA to flow? Bear in mind that you have to consider the 0,7V voltage drop across the diode from base to emitter. Let's find out Rb :. Bear in mind that you have to consider the 0,7V voltage drop across the diode from emitter to base.

How big should be resistor Rd to allow just 0,mA to flow? Let's find out Rd :. How do we test the drive of the DC motor is correctly switched? Let's check what is the voltage drop in the motor and the transistor for every configuration. The table above indicates that there is the transistor is only taking 0,18V of the voltage available.

Because they get IB-current into a base. So, the motor will rotate on the forward direction. Because the electrical current flowing from Q1 into the positive of the motor. Then later as Figure 7 , we change power supply-V1 point into B-point. The Q4 and Q2 also work by they get current from the base. It makes them have the current flow through Q4 go to the negative of motor and through Q2-transistors to ground. Which flowing of current in this form causes the motor rotated in reverse direction.

You can see the real application here The 2 channel DC motor driver on saving model. I always try to make Electronics Learning Easy. I want dc motor move like a wiper left to right vice versa in low voltage i want to use battery. Thanks for coming back to visit my site. Your English is easy to read and understand, I use Google translate. Your question is interesting. More by the author:.

Hello everyone, In this instructable we will be using transistor as a Motor Driver. Hookup all the components according to the circuit diagram shown above.

Now Power the arduino and see your motor spinning. Thanks for viewing. Please write your questions or suggestions below. Participated in the Makerspace Contest View Contest. Did you make this project? More by the author:. About: Arduino Tutorials by Codebender.

The connections below are the same ;- In this tutorial we will spin a dc motor from one direction, with different speed. So, let's get started! The connections are easy, see the image above with the breadboard circuit schematic. Diode in circuit: It is possible, when motor is spinning, suddenly turn off because the magnetic field inside it collapses, generating a voltage spike.

Here's the code, embedded using codebender! Press connect button below to start serial communication, try to send number from 50 to I hope you liked this, let me know in the comments. There will be more of them, so make sure to click Follow button! Did you make this project? Share it with us! I Made It! Remote Control Light Switch by alanmerritt in Arduino.

Answer Upvote. Nathanjf95 1 year ago. Reply Upvote. Alex Schroeder pathaklaukik Reply 1 year ago. Bemur22 6 years ago on Introduction.