From there, the amplified signal is driven to the SP1 loudspeaker pass C3. For example, if each transistor has hFE = 100, the total gain will be equal to (100×100) = 10,000 times. It is the connection of 2 transistors with similar characteristics. Which Q2 and Q3 ต่อกันเป็น the Darlington circuit. It needs to increase this signal by Q2 and Q3 again. But the output signal at the collector (C) not strong enough. It has a maximum collector current of 200mA and can therefore be used to drive loads under 200mA. It is designed for low power and current, moderately high speeds and medium voltage. It is used for general purpose low power switching or amplifying applications. Which designers organize the amplifier circuit in the common-emitter form.Īnd, there are R1 and R2 to connect in the voltage divider circuit for the Q1. Tech Corner J0 0 2N3904 is a widely used bipolar junction transistor. To filter out only the sound signal, then feed to Q1 at lead B. When there is an input signal, it will pass through C1. Read also: How transistor works Basic transistors amplifier circuit using 2N3904 How it works Which we will use the current gain of the transistor. Therefore, using the audio transistor will arrange the circuit to work in the active phase. We can find the current gain (hFE) from hFE = Ic / Ib. The active range is the period in which a transistor operates to conduct the current. Saturation range is the period that the current flows through the transistor fully until it reaches saturation.CUT-OFF is that the transistor will stop working, in this period there will be no base current (IB) and collector current (IC).We can divide the operating range of the transistor into 3 ranges. It is suitable to learn how the transistor works. This is a basic transistor amplifier circuit. *This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information.Basic transistors amplifier circuit using 2N3904 It has a maximum collector current of 600mA and a maximum collector-emitter voltage of 40V. KSP2222A: This is another NPN bipolar junction transistor with a similar package and pinout as 2N3904. PN2222A: This is another widely used general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. It has a maximum collector current of 100mA and a maximum collector-emitter voltage of 30V. It has similar electrical characteristics, including a maximum collector current of 100mA and a maximum collector-emitter voltage of 45V, making it a possible drop-in replacement in certain applications.īC548: This is another general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. Here are a few possible replacements for 2N3904:īC547: This is a general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. It has a maximum collector current of 200mA and a maximum collector-emitter voltage of 40V. Its small size and wide range of applications make it an essential component in many electronic circuits.ĢN3904 is a widely used general-purpose NPN bipolar junction transistor that is commonly used in amplification and switching applications. Overall, the 2N3904 is a widely used transistor due to its low cost, availability, and versatility. Newark offers fast quotes, same day shipping. Its high transition frequency makes it suitable for use in high-frequency applications, while its low input and output capacitances make it ideal for use in circuits where fast switching is required. Buy 2N3904 - Multicomp Pro - Bipolar (BJT) Single Transistor, NPN, 40 V, 200 mA, 625 mW, TO-92, Through Hole. The 2N3904 can be used in a variety of electronic circuits, such as amplifiers, switch drivers, and general-purpose switching applications. Some of the technical specifications of the 2N3904 are:Ĭollector-Emitter Saturation Voltage: 0.2V It is a small signal transistor with a maximum collector current of 200 mA and a maximum collector-emitter voltage of 40 V. NPN silicon epitaxial planar transistor for switching and Amplifier applicationsĢN3904 is a commonly used NPN bipolar junction transistor (BJT) in electronic circuits for amplification and switching applications. This graph from the 2N3904 datasheet shows a typical saturation voltage around 50 mV between 1 mA and 10 mA collector current. The voltage is much more constant than that. NPN Silicon Transistor (General small signal application) That will vary a bit with current, but not linearly so you would speak of a fixed resistance. NPN SILICON PLANAR EPITAXIAL SWITCHING TRANSISTORS
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