TDA8954 digital power audio amplifier board features a wide operating voltage range of +/- 12.5V to +/- 42.5V. And it not only supports the AC power supply but also supports the DC power supply. Besides, the power amplifier comes with two modes of two-channel OCL or mono BTL bridge.

Perfect protection: over-voltage protection, output current limitation.High efficiency, small quiescent current.

Fixed frequency: clock switching frequency can be external synchronization.

There is no “bang” when power on / off. Zero dead time PWM output switch.

High Power Output: As a single-ended amplifier, output 2 x 210W at Vp = +/- 40V and RL = 4; as a BTL amplifier, with BD modulation and low noise, output 420W.

Cooling device: aluminum radiator

Specification:

• Chip: TDA8954; Amplifier type: D class; Working voltage: Dual AC16V to Dual AC28V (recommended voltage of dual AC24V); Power Input: AC24V or DC35V (refer attached image for connection details)
• Amplifier design: Two-channel stereo high-power amplifier
• Audio input: Differential input (stereo) or single-ended input (Mono)
• Power Output: Stereo – 210W + 210W or mono BTL 1 * 420W, RL = 8Ohm
• Frequency response: 20Hz-20KHz; Output impedance: 4Ohm-8Ohm

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

Support MP3 format, playing power on automatically. When mp3 is played the red LED flashes
Support U disk (test 32G), TF Card (test 16G) play mode; power on default TF card mode, if the TF card does not exist automatically jump to the U disk mode, and both devices have installed, then you can manually set the play mode.

For details please see the key operating instructions

• Buttons can be adjusted up and down to control songs, volume up and down, pause or play, mode switching.
• Press menu button enter the single/all song play mode. The default mode is the all song mode when power up. Pressing the Repeat button can replace the circulating mode

Product Key Operating Instructions:

• “Prev / V–” button: “Press” for switching previous song, “long press” for volume down
• “Next/v++” button: “Press” for switching next song, “long press” for volume up
• “P / P / Mode” button: “Press” for the “Play/Pause” Switch, “long press” for U disk, TF card mode
• “Repeat” button: “Press” for “single/all song” mode(no long press)

Product Note:

• “Long press” approximate 2S
• If you use U disk mode, it is recommended 5V power supply, and some U disk does not support 3.7V power supply
• Exquisite double-board design, a large area of copper, stable and reliable

Specification:

• Chipset: GPD2856C; Onboard 2W mono amplifier(5V power of up to 3W) is directly connected to the speaker (recommendation 4 Ω 3W speakers)
• Output Connector: 3.5mm gold plated headphone jack can connect with headphones or external audio
• Power: With a Micro USB port. Through the mobile phone data line can use mobile power supply or the USB cable to charge the MP3 battery,also can use 3.7V lithium battery,or USB 5V power supply
• Storage: Support TF Card (mobile phone memory card up to 16GB) and U disk up to 32GB (USB Pendrive) play mode
• Power range: 3.7~5.5V

1. AB/D type working mode switching, level setting
2. 0.1% THD (tested with 1W output power, 5V power supply 4-ohm speaker)
3. Excellent “Power on, Power-down” noise suppression.
4. Overcurrent, overheat and Undervoltage protection
5. eSOP8 Package
6. Open space range 15Meters
7. Automation connection of paired devices and automatic music playback
8. F-Class amplifier 5W+5W, high power output, sound quality over 8002

Specification:

• Product Name: CT14-3W-2Channel-Bluetooth-2.1-EDR-Receiver: Color of PCB varies
• Bluetooth Version: BT2.1+EDR
• Operating Voltage: 3 ~ 5V; Operating current: 2A (max)
• Recommended power supply: 5V 2A; Please use a good quality power supply or lithium power bank to avoid humming noise.
• Output Power: 3.2W(4ohm speaker @ 5V), 5W (2ohm speaker @ 5V); Efficiency: 85%