Dual-channel stereo output 3 w + 3 w power Class D Works with 3.4V-5v power supply High amplification efficiency 85% can directly drive 4 Ω/8 Ω small speakers Good sound quality & noise suppression Unique without LC filter class D digital power board Can use computer USB power supply directly Small Size, 2.2 x 2 cm can easily fit in a variety of products

• Dual-panel wiring, properly solve the crosstalk between the ground potential balance and channel wiring
• Unique without LC filter Class D digital power board, and can be used directly to the computer’s USB powered.
• Two-channel stereo, 5V micro USB power supply can output 3W +3 W power, can directly drive 4 8 small speaker output power, full of energy, good sound quality.
• Excellent noise suppression in the case is not connected to the input audio, the ear close to the speaker can not hear any noise
• Output power: 3.0W (4Ω load), 3.8W (3Ω load), 5.0W (2Ω load); Supply voltage: DC3.4V-DC5V; Dimensions: 2×2.2cm/0.79×0.87inch

This is Digital Power Amplifier Board it uses the official standard circuit design, the chip PAM8406 is imported from USA and is original Longding Micro-D power amplifier chip, it can produce distortion free high efficiency power throughput of 5w with an 5v power supply without a need for heat sink.

Performance:

• Efficiency: >90%
• Total Harmonic Distortion plus Noise: <10%
• Low quiescent current
• Noise suppression
• Protection: reverse power supply input protection, short-circuit, overheat, pass EMI

Additional features:

• External power amplifier type selection function (MODE: high level Class D, low level Class AB, factory default high level)
• External Shutdown (SD: Chip Shutdown at Low Level, Factory Default High Level)
• Can be muted externally (MUTE: low-level mute, factory default high level)

Specification:

• Working Mode: Class D (PWM modulation type)
• Chip Type: PAM8406 2 x 5W Stereo HIFI
• Supply voltage: DC 5V (Do not overvoltage, overvoltage will burn IC)
• Input method: single-ended 
• Output power: 5W 2Ω 5V /3W 4Ω 5V /1.8W 8Ω 5V
• Impedance: 2-8 Ohm 
• SNR: 90% Recommended 
• Speakers: 10-100W

• Mono PBTL digital power amplifier board PBTL Power amplifier chip: TPA3110
• Working voltage: 8 -26 VDC
• Output power: 1 x30w (mono, stereo need 2pcs)
• Board Size:43mm*30mm
• Recommend speaker impedance: 8 ohm is best (4 ohms 6 ohms can also be used)

Dual-channel stereo output 15 w + 15 w power Class D Works with 12v power supply High amplification efficiency 85% can directly drive 4 Ω/8 Ω small speakers to medium speakers. Good sound quality & noise suppression Unique with LC filter comes with switch Potentiometer, can adjust the volume & control power switch freely!

• Dual Channel 15W per Channel – with volume Control, Dual-panel wiring, properly solve the crosstalk between the ground potential balance and channel wiring
• Unique with LC filter Class D digital power board, and can be used directly to the computer’s USB powered.
• Operating voltage: DC 7.5 – 15V, Recommended voltage: 12 V, Quiescent current: 20 mA, Rated output power: 10 W +10 W (8)
• Excellent noise suppression in the case is not connected to the input audio, the ear close to the speaker can not hear any noise
• Frequency response: 20Hz to 50KHz

Dual-channel stereo output 3 w + 3 w power Class D Works with 2.5V-5v power supply High amplification efficiency 85% can directly drive 4 Ω/8 Ω small speakers Good sound quality & noise suppression Unique without LC filter class D digital power board Can use computer USB power supply directly Small Size, 1.85 x 2.11 cm can easily fit in a variety of products

TDA2030A audio amplifier circuit, often using a V-5-pin single in-line plastic package structure. The integrated circuit is widely used in car stereo receiver tape recorders, medium-power audio equipment, small size, large output power, distortion, and other characteristics. And has an internal protection circuit.

• onboard TDA2030A audio power amplifier chip
• Working voltage: 6 -12 VDC, Output power: 1 x 18w (mono, stereo need 2pcs)
• on-board speaker wiring blocks, onboard 10K adjustable resistance, you can adjust the volume of amplification, Onboard power indicator, Board Size:32.2mm*24mm
• The peak output current is 3A, Recommend speaker impedance: 8 ohm is best (4 ohms 6 ohms can also be used)