High-performance 2.1-channel amplifier board delivering 2x50W + 100W output. Features wide voltage input (8-24V DC), reverse polarity protection, inrush current limiting, short-circuit protection, and overheat protection.
Specifications:
Chip: TPA3116D2 x 2
Amplifier Class: D
Channels: 2.1 (2x50W + 100W)
Impedance: 4-8Ω
Voltage: DC 8-24V
Protection: Reverse Polarity Protection, Short-Circuit Protection, Overheat Protection
Precautions:
Power input is equipped with built-in reverse polarity protection. Reverse connection will not damage the board.
Output power depends on the supply voltage and speaker impedance. For high-power applications, we recommend:
Voltage: 24V DC
Current: >5A
Speakers: 4Ω load is preferred for maximum power output.
All speakers must be mounted in enclosures (boxes). For the subwoofer channel, a factory-tuned enclosure is strongly recommended, as DIY boxes often yield poor performance.
Strictly observe correct polarity (+/-) on each channel. Reversing polarity will significantly reduce sound efficiency.
The speaker outputs are in BTL (Bridge-Tied Load) configuration. DO NOT share a common ground between channels; otherwise, sound will be distorted and the amplifier may be damaged.
How to check for background noise (noise floor):
Short the input terminals, connect a speaker, and listen. Under normal conditions, only a very faint hiss should be audible (typically inaudible from 50 cm / 20 inches away). If the noise is excessive, the board may be faulty. If noise increases when connected to a PC or phone, the noise originates from the signal source.
Recommended speaker impedance & power:
Stereo channels (L/R): 4Ω / 50W or 8Ω / 30W per channel
Subwoofer channel: 2Ω / 100W