Simple Electronic Project – LED Chaser Circuit

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Components Used:

  • 2n2222A Transistor
  • LED
  • 10k Ohm resistor
  • 100 Ohm resistor
  • 47uf 25v
  • Connectors
  • 9v-12v power Supply

Gerber File:

Download Gerber File

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Circuit Diagram:

2N2222A Transistor :

The 2N2222A transistor is a legendary NPN bipolar junction transistor (BJT) that has been widely used in electronic circuits for decades. Its versatility, reliability, and affordability make it a popular choice among electronics enthusiasts and professionals alike.

Features

  • NPN BJT
  • Collector current: 800mA
  • Collector-emitter voltage: 40V
  • Base-emitter voltage: 6V
  • Current gain (hFE): 100-300
  • Switching speed: 100ns

Applications

  • Amplifiers
  • Switches
  • Digital logic circuits
  • Audio circuits
  • Power supplies
  • Motor control circuits

How to Use

  1. Connect the collector to the positive supply or load.
  2. Connect the emitter to ground or negative supply.
  3. Connect the base to the input signal or control voltage.
  4. Ensure proper biasing for linear amplification or switching.

Advantages

  • Low cost
  • High current gain
  • Fast switching speed
  • Wide availability

Disadvantages

  • Limited power handling
  • Not suitable for high-frequency applications

Alternatives

  • 2N3904 (PNP complement)
  • BC547 (similar NPN transistor)
  • TIP41C (power transistor)

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