The LM4881 Headphone Amplifier Board is a compact, ready-to-use audio amplifier module built around the LM4881 dual headphone amplifier chip. Just connect a DC power supply (3.6V to 12V), feed in an audio signal, and drive your headphones directly — no extra circuitry needed. It can also be used as a pre-amplifier stage in front of a larger power amplifier.
An onboard volume knob lets you adjust the output level, and turning it fully counter-clockwise switches the board off. Audio input and output are connected through simple JST connectors, and a standard 3.5mm jack is provided for plugging in headphones directly.
Key Features
- LM4881 dual headphone amplifier chip — up to 160mW output power
- Wide supply voltage: DC 3.6V–12V (onboard 5V regulator)
- Standard 3.5mm headphone jack output plus 2.54mm pin header output
- Volume adjustment potentiometer with built-in power switch
- JST connectors for audio input, audio output, and power
- Can be used as a headphone driver or as a pre-amplifier
- Compact board: approx. 50mm × 25mm, weight ~20g
Ideal For
- DIY headphone amplifier and portable audio projects
- Adding a headphone output to DIY audio builds
- Pre-amplifier stage before a power amplifier board
- Arduino / Raspberry Pi audio output projects
- Students, hobbyists, and audio electronics labs
Specifications
- Amplifier chip: LM4881
- Operating voltage: DC 3.6V–12V
- Maximum output power: 160mW
- Output: 3.5mm headphone jack + 2.54mm pin header
- Control: volume knob with on/off switch
- Board size: 50mm × 25mm
- Weight: approx. 20g
Package Includes
- 1 x LM4881 Headphone Amplifier Board