Dual Axis LED Chaser Circuit

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Components Required:

  • 10kΩ Resistor
  • 3.3kΩ Resistor
  • 220Ω Resistor
  • 5mm LED
  • 1µF Capacitor
  • 220µF Capacitor
  • NE555 IC
  • CD4017 IC
  • 9014 Transistor
  • Self-lock Switch
  • 100kΩ Potentiometer
  • Power Connector
  • PCB Board

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9014 Transistor?

The 9014 is an NPN bipolar junction transistor (BJT) commonly used in low-power switching and amplification circuits. It is popular among hobbyists and electronics designers because of its small size, reliability, and low cost.

Key Features:

  • Type: NPN BJT
  • Max Collector Current (Ic): ~500 mA
  • Max Collector-Emitter Voltage (Vceo): ~45 V
  • Gain (hFE): Typically 100–300 (good for amplification)
  • Package: TO-92 (through-hole) or SOT-23 (surface-mount variant)

Pin Configuration (TO-92 Package):

  1. Emitter (E) – Connected to ground or negative supply.
  2. Base (B) – Controls the transistor (input signal).
  3. Collector (C) – Output current flows through here.

(Flat side facing you, pins down: left = E, middle = B, right = C)

Applications of 9014:

  • Signal Amplification – Used in audio pre-amplifiers and small signal boosters.
  • Switching – Drives small loads like LEDs, relays, and buzzers.
  • Oscillators & Timers – Often found in basic oscillator circuits.
  • Consumer Electronics – Radios, toys, remote controllers, etc.

Why is the 9014 Useful?

  • Works well in low-voltage and low-current circuits.
  • Provides good current gain for simple amplification.
  • Widely available and cheap.
  • Perfect for DIY electronics projects.

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