The price for 2n3904 is 9rupess for 3pieces or 0.12USD dollars.The 2n3904 transistor is a low-power general purpose transistor, which had more applications at common appliances.Much higher circuit arrangements will be used at switching applications of the 2n3904 transistor. When the switch is closed the current starts to flow through the transistor base and it triggers ON and sent a signal to the LED.The 2n3904 is a low-power general purpose transistor, here we can see minimum component will be used to switch the LED using the 2n3904 transistor.It is the same type included with the Propeller. The mini version of 2n3904 as a switch is the circuit above. The 2N3904 NPN Transistor is one of the most commonly used general purpose NPN transistors in electronics.Technically three-stage of amplification is done at this circuit to make an audio signal.As we can at the circuit both the 2n3904 transistor are connected back to back, that is the output signal from the Q2 transistor will pass towards the second transistor Q3.The amplification of the audio signal is done initially by the Q1 2sc1815 transistor, then the signal reaches the input of the 2n3904 transistor.The circuit consists of two 2n3904 transistors and 2sc1815 transistors.The figure shows the amplifier circuit using a 2n3904 transistor.In the table, we try to compare the electrical specifications of each of the transistors 2n3904 vs mpsa18, 2n3904 vs bc548, and 2n3904 vs 2n3906.Ģn3904 amplifier circuit 2n3904 amplifier circuit. The total device dissipation of the 2N3904 is 625mW, while the BC547 is 500mW. The maximum collector current of the 2N3904 is 200mA, while the collector current of the BC547 is 100mA.
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