Easy Homemade Audio Amplifier Circuit using Single Mosfet

Quick circuit of Audio Amplifier.

Introduction

This is a very simple audio amplifier circuit using a single MOSFET (IRFZ44N), designed for amplifying audio signals from mobile phones, laptops, or other low-power sources. This circuit is an easy DIY solution for beginners interested in building a low-power amplifier that can drive an 8-ohm speaker with a 6V DC power supply.

Circuit Components & Connections

Components Used:

1. MOSFET Transistor (IRFZ44N) – Acts as the main amplification component.
2. Resistor (R1 – 20kΩ) – Provides biasing to the MOSFET gate.
3. Capacitor (C1 – 100μF) – Blocks DC and allows AC (audio signal) to pass through.
4. Power Supply (6V DC) – Powers the amplifier circuit.
5. Speaker (8Ω, small size) – Produces amplified audio output.
6. Audio Input (Mobile/Laptop output) – The audio signal source.

Circuit Explanation & Working

1. Audio Input Section:

• The audio signal is fed into the circuit via the input capacitor (C1 – 100μF).
• The capacitor blocks DC components and allows only AC (audio signal) to pass, preventing unwanted noise.

1. MOSFET Amplification Stage:

• The IRFZ44N MOSFET is used as an audio signal amplifier.
• R1 (20kΩ resistor) biases the MOSFET’s Gate (G) to ensure proper switching operation.
• The Source (S) of the MOSFET is connected to ground (GND).
• The Drain (D) is connected to the positive terminal of the speaker and then to VCC (6V DC).

1. Output Stage (Speaker Connection):

• The amplified output signal is sent to the 8Ω speaker, producing an amplified version of the input audio signal.
• The MOSFET acts as a current amplifier, allowing the weak input signal to drive the speaker effectively.

Features of this Single MOSFET Audio Amplifier

• Simple & Easy-to-Build: Requires very few components, making it ideal for beginners.
• Operates on Low Voltage (6V DC): Suitable for battery-powered applications.
• Compatible with Mobile/Laptop Audio Sources: Works well with any low-level audio output.
• Compact & Efficient: Single MOSFET design ensures efficiency and small circuit size.
• Drives an 8Ω Speaker: Provides sufficient audio amplification for small-scale applications.

Applications

✔ DIY Audio Projects
✔ Small Portable Speaker Systems
✔ Mobile & Laptop Audio Amplifiers
✔ Educational Electronics Projects

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