Summary of 5.5W – 2 CHANNEL AUDIO AMPLIFIER
This project details a compact 5.5W two-channel audio amplifier built around the Sanyo LA4445 integrated circuit. Operating with a 12V DC supply, it drives 4-ohm speakers while offering features like thermal and overvoltage protection, low pop noise, and high ripple rejection. The design emphasizes minimal external components to achieve efficient stereo sound output with a voltage gain of 50dB.
Parts used in the 5.5W – 2 Channel Audio Amplifier:
- LA4445 IC
- PCB
- 4 Ohm Speakers
- 12V DC Power Supply
This project is a 5.5W – 2 Channel Audio Amplifier based on LA4445 IC.
DESCRIPTION
The small 2 Channel amplifier constructed around Sanyos LA4445 IC delivers 5.5Watts +5.5 Watts at 4 ohm load, supply in 12V DC 2Amp, Input impedance 30K.
SPECIFICATIONS
- Dual Channels output : 5.5W
- Minimum External Parts
- Very small pop noise at the time of power supply ON/OFF
- Good ripple rejections
- Small residual noise
- Built-in protectors 1. Thermal Protector 2. Overvoltage Surge Protector
- Standard Audio signal
- Supply 12V DC
- Load : 4 Ohms Speaker on Each Channel
- Voltage Gain : 50DB
- Output 5.5W on each Channel (THD 10%)
- Total harmonic distortion 1% Max @ Po=1W
- Input impedance 30 K-ohms
SCHEMATIC
PARTS LIST
PCB
Source: 5.5W – 2 CHANNEL AUDIO AMPLIFIER
- What is the power output of this amplifier?
The amplifier delivers 5.5 Watts per channel at a 4 ohm load. - Can this project operate without many external parts?
Yes, the design requires minimum external parts. - Does the amplifier produce noise when turning on or off?
No, it generates very small pop noise at the time of power supply ON/OFF. - What type of protection does the LA4445 IC include?
It includes built-in Thermal Protector and Overvoltage Surge Protector. - How much current does the power supply need?
The supply requires 12V DC at 2 Amps. - What is the input impedance of the circuit?
The input impedance is 30 K-ohms. - Is the total harmonic distortion low?
Yes, the total harmonic distortion is 1% Max @ Po=1W. - What speaker load should be used for each channel?
A 4 Ohm speaker should be used on each channel.
