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8 Simple 2N3904 Circuits for Beginners

Author: Iggy
Date: 26 Jan 2022
 16416

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Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
2N3904BU 2N3904BU Company:ON Semiconductor Remark:TRANS NPN 40V 0.2A TO-92 Package:TO-226-3, TO-92-3 (TO-226AA)
DataSheet
In Stock:75103
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Price:
1+: $0.20000
10+: $0.16200
25+: $0.13600
100+: $0.06640
500+: $0.05542
1000+: $0.03851
2000+: $0.03579
4800+: $0.03095
9000+: $0.02567
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In this blog, Apogeeweb has prepared 8 simple 2N3904 circuits for electronics enthusiasts. These circuit diagrams are basically beginner-friendly types. Hope these circuit diagrams are helpful to you.

Catalog

2N3904 Circuits

Component Datasheet

FAQ


2N3904 Circuit

Circuit 1: Thermostat controller composed of LM75 intelligent temperature sensor and 2N3904 transisitor

Thermostat controller

  • Circuit 2

2N3904 Circuit

  • Circuit 3

2N3904 Circuit

  • Circuit 4

2N3904 Circuit

  • Circuit 5

2N3904 Circuit

  • Circuit 6: 2N3904 Sample Circuit-Amplifier

2N3904 Sample Circuit-Amplifier

  • Circuit 7: How to design a 13.56mhz sine wave power amplifier circuit with 2N3904

a 13.56mhz sine wave power amplifier circuit with 2N3904

  • Circuit 8: The non-inverting circuit uses a pair of complementary NPN type (2N3904) and PNP type (2N3906) transistors

non-inverting circuit uses a pair of complementary NPN type (2N3904) and PNP type (2N3906) transistors


Component Datasheet

2N3904 Datasheet


FAQ

  • What is a 2N3904 Transistor?

The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. It is designed for low current and power, medium voltage, and can operate at moderately high speeds.

  • How Does a 2N3904 Transistor Work?

2N3904 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. 2N3904 has a gain value of 300; this value determines the amplification capacity of the transistor.

  • What is PNP NPN?

PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state. ... NPN, or “sinking” output sensors, work in the opposite way, sinking ground voltage to an input when it's on.

  • Whats is A Transistor?

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit.

  • What is the Gain of a Transistor?

The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant. Typical common-base current gain in a well-designed bipolar transistor is very close to unity.

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