XH-M139 TPA3116D2 2.1-Channel Amplifier Board

Overview

The XH-M139 is a 2.1-channel digital amplifier board built on two TPA3116D2 Class-D amplifier chips. One chip drives the left and right speakers, and the second runs in bridged mode for a subwoofer.

It runs from a 12-24 V DC supply, such as a switch-mode adapter or a 12 V battery, which suits DIY speaker builds, PC and TV sound, and vehicle or portable audio. Class-D operation keeps the board efficient and cool compared with linear amplifiers of similar power.

Key Features

• 2 × TPA3116D2 Class-D amplifier chips
• 2.1 channels: left, right and subwoofer
• Rated 2 × 50 W plus 100 W subwoofer (at the upper supply voltage)
• 12-24 V DC supply
• For 4-8 Ω speakers
• Three rotary control knobs

Typical Applications

• DIY 2.1 speaker systems and subwoofer boxes
• Upgrading PC, TV and laptop sound
• Car, boat and portable battery-powered audio
• Workshop and shop music systems

Compatibility

Use 4-8 Ω speakers for the left, right and subwoofer outputs. Output power depends on the supply: a 12 V supply gives noticeably less than the rated figure, which applies near 24 V.

Important Notes / Safety

• Use a DC supply only, within 12-24 V. Do not connect a transformer directly.
• Choose a supply that can deliver enough current for the volume you need; a weak supply causes distortion and cut-outs.
• Do not short the speaker outputs or connect them to ground, as the outputs are bridged.