The complete circuit is powered via a 5 V supply. I will explore different IC's in my later tutorials and will surely share all them with all of as you as well.In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal. Our entire team is 24/7 here to entertain you and to solve your issues in a way or the other. I will try my level to entertain you and to solve your issues in a better way, if possible. If you face any sort of problem regarding any thing, you can ask me anytime in comments without even feeling any kind of hesitation. So that is all from the tutorial Introduction to 2N3904. I hope you really enjoyed this tutorial. You should watch this below video to understand how to run this Proteus Simulation:.rar file, extract it and enjoy the complete package. You can download the complete Proteus ISIS simulation as well as complete Arduino source code, here by clicking on the button below.hex file and running the simulation you need to change the level of logic state from 0 to 1, and the motor will start to rotate. From the above figure you can see that after uploading.The running form of the above simulation is shown in the below figure:.You have to get the hex file in Arduino to observe the results properly.The complete Arduino source code of the above simulation is given below.The screenshot of the simulation is shown in the figure below.I have made another simulation in Proteus ISIS for DC motor control using 2N3904.Now, I am going to control a DC motor with Arduino. In above simulation, we have controlled a simple LED and have used a manual switch. So, that's how we can use 2N3904 transistor as a switch.Now when we have applied 5V at Base Terminal(using LogicState in Proteus), 2N3904 gets forward biased and now LED is ON, as shown in below figure:.As there's no voltage applied at Base Terminal, so 2N3904 is reverse biased and thus LED is OFF.As shown in below figure, power is supplied at Collector and LED is connected at the Emitter with resistor(to limit current) & grounded from the other end.Let's first control a simple LED on/off state using 2N3904 NPN transistor.Now, let's design a simulation to practically understand, how 2N3904 transistor acts as a switch? When small voltage applies at its Base Terminal(normally 5V), 2N3904 converts its state from reverse to forward biased and conventional current starts flowing from Collector to Emitter.In normal state, 2N3904 acts as reverse biased and there's no conduction between Collector & Emitter.sound amplifiers) as it has high current gain & thus can be used as an amplifier. 2N3904 is also in signal amplification projects(i.e.pulse width modulation(pwm), because of its fast switching speed. It's also used in fast switching applications i.e.It's normally used as a simple switch to control heavy loads, because of its low saturation voltage and high gain.Few of 2N3904 applications are as follows: Now, let's have a look at few applications of 2N3904:ĢN3904 is one of the most commonly used NPN transistor because of its low-cost, high-speed and small-size. If current/voltage passing through a transistor exceeds its ratings, the transistor may burnt out.So, a circuit designer's task is to select an optimized transistor for its circuit, which should fullfill all its power equirements & must be cost efficient.Transistors are available in different ranges of power ratings and their selection depends on circuit's requirements.Now let's have a look at poewr ratings of 2N3904: Let's have a look at the equivalents of 2N3904 NPN Transistor:Īlthough common transistors such as 2N3904 are easily available in local/online electronics stores, but its wise to know the alternatives. Here's the link to download 2n3904 Datasheet: In order to get in-depth knowledge on any component, must read its datasheet.Let's have a look at the Datasheet of 2N3904: 2N3904 Pinouts alongwith their symbols are shown in the table given below.2N3904 Pin Diagram is shown in below figure:.used in televisions, home appliances, medium-load switches, PWM applications etc. It has a wide range of applications i.e.Small voltage at base(around 0.7V) changes its state from reverse to forward biased and starts conducting.As it's an NPN transistor, so major charge carriers are electrons caryying negative charge.2N3904 is a silicon NPN Bipolar Junction Transistor (BJT), enclosed in TO-92 package and is normally used for switching & amplification purposes.
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