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:
- MOSFET Transistor (IRFZ44N) – Acts as the main amplification component.
- Resistor (R1 – 20kΩ) – Provides biasing to the MOSFET gate.
- Capacitor (C1 – 100μF) – Blocks DC and allows AC (audio signal) to pass through.
- Power Supply (6V DC) – Powers the amplifier circuit.
- Speaker (8Ω, small size) – Produces amplified audio output.
- Audio Input (Mobile/Laptop output) – The audio signal source.
Circuit Explanation & Working
-
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.
-
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).
-
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
Best SEO Keywords for Optimization
- Single MOSFET Audio Amplifier Circuit
- DIY Simple Audio Amplifier Using MOSFET
- MOSFET IRFZ44N Audio Amplifier Design
- Low Power Audio Amplifier for Mobile & Laptop
- Easy Homemade Audio Amplifier Circuit
Hello Aman bharti. thanks this circuit.
and I have some questions.
I try to make two stage mosfet amplifier audio amp. and I change your circuit.
How do I connect if I want to add CD AMP here?