LED Flasher Circuit

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A Dimmer is an electronic device that uses PWM signals to control the speed and direction of a motor. It works by varying the width of the pulses to adjust the average voltage applied to the motor, thereby controlling its speed.

Components Used:

  • 9014 Transistor
  • 510 Ohm
  • 33k Ohm
  • Red LED * 5
  • Green LED * 5
  • 22uf Capacitor
  • Connector
  • 3.7v Battery

Gerber File:

PWM Motor Controller Circuit
PWM Motor Controller Circuit
Download Gerber File

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The LM358 is a reliable, affordable, and versatile operational amplifier that is ideal for a wide range of analog applications. Whether you're building audio amplifiers, filters, voltage followers, or sensor signal conditioning circuits, the LM358 is a solid choice. Its ease of use, low power consumption, and dual op-amp configuration make it a go-to component for both beginners and experienced engineers. Proximity Sensor Circuit
Proximity Sensor Circuit


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Circuit Diagram:

LED Flasher Circuit

9014 Transistor:

The 9014 is a low-power, general-purpose NPN transistor used in many small signal and low-voltage applications. It is designed for amplifying or switching electronic signals. Due to its low cost and easy availability, it’s a favorite among hobbyists and engineers alike.

🔍 Technical Specifications

ParameterValue
TypeNPN
Collector-Emitter Voltage (Vce)45V
Collector-Base Voltage (Vcb)50V
Emitter-Base Voltage (Veb)5V
Collector Current (Ic)800mA
Power Dissipation625mW
DC Current Gain (hFE)64–400
Transition Frequency (fT)250 MHz
Package TypeTO-92

9014 Transistor

The 9014 transistor comes in a TO-92 package, which has three terminals:
E (Emitter) – Current flows out from here.

B (Base) – Controls the transistor.

C (Collector) – Current flows into this terminal.

Modes of operation:

Cut-off Region (OFF): No base current → No collector current.

Active Region (Amplifier): Small base current → Proportional collector current.

Saturation Region (ON/Switching): Base current high → Maximum collector current.

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