All products · 6 of 1440
Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
Sound Playback Module
Voice board, recording, recorder, playback, mic, sound, audio loudspeaker.
Out of stockGold AP-55 TPA3116D2 2×50W Bluetooth Stereo Digital Amplifier Board with USB, TF Card, FM & Remote
[Amplifier Board] Gold AP-55 TPA3116D2 2×50W Bluetooth Stereo Digital Amplifier Board with USB, TF Card, FM & Remote The Gold AP-55 is a compact Class-D stereo digital audio amplifier board based on the TPA3116D2 amplifier IC, designed for DIY Bluetooth speakers, home audio systems, portable speakers, bookshelf speakers, multimedia systems, and custom audio projects. Available product listings consistently identify the AP-55 as a dual-channel 50W + 50W amplifier, with a DC input range around 8–24V or 12–24V depending on the listing/version. The AP-55 combines the power amplifier with a multimedia player supporting Bluetooth 5.0, USB, TF/SD card, FM radio and AUX input. The Bluetooth device name is reported as GD-82EM, while the FM tuner covers 87.5–108.0MHz. It also includes an infrared remote control and a digital display for convenient operation. The TPA3116D2 Class-D amplifier provides efficient stereo amplification, making the board suitable for building compact but powerful audio systems. One detailed listing specifies support for 4Ω–8Ω speakers, with the commonly advertised maximum output of 50W per channel. ⭐ Key Features Gold AP-55 amplifier module TPA3116D2 Class-D amplifier IC 50W + 50W dual-channel stereo output Supports 4Ω–8Ω speakers Bluetooth 5.0 wireless audio Bluetooth device name: GD-82EM Built-in USB music player Built-in TF / SD card player Built-in FM radio FM frequency range 87.5–108.0MHz 3.5mm AUX input Infrared remote control Digital display Supports MP3 / WMA / WAV Power-off memory function Remembers the previous song and volume Compact design for DIY speaker projects High-efficiency Class-D amplification 📋 Technical Specifications Product Type: Stereo Class-D Digital Amplifier Board Model: Gold AP-55 Amplifier IC: TPA3116D2 Amplifier Class: Class-D Number of Channels: 2 / Stereo Output Power: 50W + 50W Maximum Total Output: 100W Speaker Impedance: 4Ω–8Ω Input Voltage: DC 8–24V (some listings specify 12–24V; verify the exact board version before use) Bluetooth Version: 5.0 Bluetooth Name: GD-82EM Bluetooth Range: Up to approximately 10–15m under suitable conditions Audio Formats: MP3 / WMA / WAV USB Support: Yes TF/SD Card Support: Yes FM Radio: Yes FM Frequency: 87.5–108.0MHz AUX Input: 3.5mm / Wired Audio Input Remote Control: IR Remote Remote Range: Approximately 4–7m Display: Digital Display Power-Off Memory: Yes Memory Function: Last song and volume Audio Input Modes: Bluetooth / USB / TF Card / FM / AUX Output: Dual-Channel Stereo Efficiency: Greater than 90% according to one detailed listing SNR: Approximately 102dB according to one detailed listing Distortion: Below 0.1% at normal listening levels according to one detailed listing Board Size: Approximately 70 × 50 × 20mm with shell, according to one listing 🎵 Audio & Playback Functions The AP-55 can switch between Bluetooth, USB, TF/SD Card, FM Radio and AUX sources. When Bluetooth mode is selected, users can pair a phone or other compatible device with GD-82EM. USB and TF/SD cards can be used for local music playback, while AUX provides a wired audio input. 📻 FM Radio The built-in FM tuner supports the 87.5–108.0MHz broadcast band. FM stations can be searched and selected using the onboard controls or remote control. 🎛️ Controls & Remote The module provides controls for functions such as previous track, next track, volume up, volume down, play/pause, mode selection and FM station selection. The infrared remote provides additional wireless control of playback, volume, mode and other supported functions. 🔧 Applications DIY Bluetooth Speakers High-Power Bluetooth Speaker Projects Portable Speaker Systems Bookshelf Speaker Systems Home Audio Projects Multimedia Speaker Systems USB MP3 Speaker Systems TF/SD Card Music Players FM Radio Speaker Projects Car Audio Projects Custom Wooden Speaker Cabinets Desktop Audio Systems Electronics DIY Projects 🛠️ Installation Connect a suitable DC power supply within the specified voltage range and observe the correct polarity. Connect the left and right speaker outputs to compatible 4Ω–8Ω speakers. Select Bluetooth, USB, TF/SD, FM or AUX according to the desired audio source. For maximum advertised output, a suitable 24V high-current power supply is recommended by one vendor; at lower supply voltages, available output power will be lower. 📦 Package Includes 1 × Gold AP-55 TPA3116D2 2×50W Bluetooth Amplifier Board 1 × IR Remote Control 1 × Required Connecting Wires/Cables (package contents may vary by seller/version) ⚠️ Precautions Verify the exact input voltage requirement of your AP-55 version before powering it. Do not exceed 24V DC where the board specification limits input to 24V. Check power polarity carefully before connection. Use speakers with a compatible 4Ω–8Ω impedance. Do not short-circuit the speaker output terminals. Ensure adequate ventilation during high-power operation. Use a suitable high-current power supply for high-output operation. Do not connect the speaker outputs together or directly to ground. Keep the board away from moisture and conductive materials. Incorrect wiring or excessive voltage can permanently damage the amplifier IC.
2.25-Inch 8ohms 8W Full Range Speaker for Compact Audio Applications
[Speakers] 2.25-Inch 8Ω 8W Full Range Speaker for Compact Audio Applications The 2.25-Inch 8Ω 8W Full Range Speaker is a compact and efficient audio driver designed for small electronic and embedded sound applications. Featuring an 8Ω impedance and 8W power rating, this speaker delivers clear and balanced sound output while maintaining low power consumption and excellent efficiency. Its compact size makes it ideal for projects where installation space is limited, including portable speakers, DIY electronics, toys, alarm systems, intercom devices, and mini speaker enclosures. The full-range design allows it to reproduce a broad range of audio frequencies, making it suitable for both voice and music playback applications. Built with durable materials and designed for reliable long-term performance, this speaker is an excellent choice for electronics hobbyists, engineers, and product developers working on custom audio projects. ⭐ Key Features 2.25-Inch compact speaker driver 8Ω impedance 8W power rating Full-range audio reproduction Clear and balanced sound output Lightweight and compact design Easy to mount in enclosures and panels Suitable for low to medium-power audio applications Durable construction for long-term use Ideal for DIY and embedded audio systems 📋 Technical Specifications Product Type: Full Range Speaker Speaker Size: 2.25 Inch Impedance: 8Ω Power Rating: 8W Speaker Type: Full Range Mounting Type: Enclosure / Panel Mount Application Type: Audio Output 🔧 Applications Portable Speaker Systems DIY Audio Projects Bluetooth Speaker Modules Toys and Educational Kits Alarm and Notification Systems Embedded Electronic Devices Mini Amplifiers and Sound Modules Intercom Systems Robotics Projects Custom Speaker Enclosures ⚠️ Precautions Do not exceed the 8W rated power. Use an amplifier compatible with an 8Ω speaker load. Avoid exposure to moisture and excessive dust. Mount securely to minimize vibration and distortion. Do not apply direct pressure on the speaker cone. 📦 Package Includes 1 × 2.25-Inch 8Ω 8W Full Range Speaker
57mm (2.25-Inch) Internal Magnet Speaker 4Ohms 3W Full Range Audio Speaker
[Speakers] 57mm (2.25-Inch) Internal Magnet Speaker – 4Ω 3W Full Range Audio Speaker The 57mm (2.25-Inch) Internal Magnet Speaker is a compact and reliable full-range audio speaker designed for DIY electronics, multimedia devices, embedded sound systems, and portable audio applications. Featuring a 4Ω impedance and 3W power rating, this speaker delivers clear and balanced sound output while maintaining a slim and lightweight design. Its internal magnet structure provides a compact profile, making it ideal for applications where installation space is limited. The durable mounting frame allows easy integration into speaker enclosures, control panels, intercom systems, audio modules, and custom electronic projects. Designed for consistent audio performance, this speaker is suitable for voice playback, music, alerts, and general audio output in both portable and embedded electronic devices. ⭐ Key Features 57mm (2.25-Inch) compact speaker 4Ω impedance 3W power rating Internal magnet design Full-range audio reproduction Built-in mounting frame Clear and balanced sound output Compact and lightweight construction Easy installation in custom enclosures Suitable for portable and embedded audio applications Ideal for DIY electronics and speaker projects 📋 Technical Specifications Product Type: Internal Magnet Speaker Speaker Size: 57mm (2.25 Inch) Impedance: 4Ω Power Rating: 3W Speaker Type: Full Range Magnet Type: Internal Magnet Frame Type: With Mounting Frame Mounting: Frame / Panel Mount Application: Embedded Audio Systems 🔧 Applications DIY Electronics Projects Audio Modules & Music Players Intercom and Communication Systems Toys and Educational Devices Portable Audio Systems Alarm and Notification Devices Embedded Audio Applications Mini Speaker Enclosures Multimedia Devices Robotics and Automation Projects ⚠️ Precautions Do not exceed the 3W rated power. Use an amplifier compatible with a 4Ω speaker load. Ensure proper wiring polarity during installation. Avoid exposure to moisture and dust. Mount securely to reduce vibration noise. Do not apply direct pressure on the speaker cone. 📦 Package Includes 1 × 57mm (2.25-Inch) 4Ω 3W Internal Magnet Full Range Speaker
MH-M18 Wireless Bluetooth Audio Receiver Board Module BLT 4.2 MP3 Lossless Decode
[Audio Receiver] MH-M18 Wireless Bluetooth Audio Receiver Board Module – Bluetooth 4.2 MP3 Lossless Decoder The MH-M18 Wireless Bluetooth Audio Receiver Module is a compact, low-power Bluetooth 4.2 audio receiver designed to add wireless audio functionality to existing speakers, amplifiers, DIY audio systems and other projects. It supports stereo two-channel audio output and lossless decoding of WAV, WMA, FLAC, APE and MP3 formats. The module can operate from 3.7–5V and provides a transmission range of up to 20 meters under suitable conditions. ⭐ Key Features Bluetooth 4.2 wireless audio receiver Converts conventional speakers/amplifiers into Bluetooth-enabled audio systems Supports stereo dual-channel audio output Supports WAV/WMA/FLAC/APE/MP3 audio decoding Bluetooth automatic connection support Maximum transmission distance up to 20 meters in open/low-interference conditions Low power consumption Can be powered from a 3.7–4.2V lithium battery or 5V supply Compact PCB suitable for DIY projects Supports Bluetooth audio protocols including HFP, A2DP and AVRCP 📋 Technical Specifications Model: MH-M18 Bluetooth Version: Bluetooth 4.2 Operating Voltage: DC 3.7–5V Maximum Operating Current: Approximately 20mA Current in Deep Sleep: Approximately 3µA Transmission Distance: Up to 20 meters Sensitivity: -87dBm Operating Temperature: -40°C to +85°C Audio Output: Stereo, dual channel Supported Formats: WAV, WMA, FLAC, APE, MP3 Bluetooth Protocols: HFP V1.7, A2DP V1.2, AVRCP V1.5, AVCTP V1.2, AVDTP V1.2 Approx. Module Size: 23 × 16mm; some listings specify approximately 23 × 16.5 × 3mm depending on version. 🔧 Applications Convert old speakers into Bluetooth speakers DIY Bluetooth speaker projects DIY audio amplifiers Portable speaker projects Home audio systems Car audio Bluetooth upgrades Wireless audio receiver projects Custom audio and electronics projects 🛠️ Basic Connection VCC: Power input GND: Ground L: Left audio output R: Right audio output Connect the L/R audio outputs to an external amplifier. This module is an audio receiver/decoder and should not be treated as a high-power speaker amplifier. 💡 Bluetooth Indicator Fast flashing: Bluetooth not connected Steady light: Bluetooth connected Slow flashing: Bluetooth audio playback in some versions ⚠️ Important Notes Do not supply more than the specified operating voltage. For lithium-battery operation, use a suitable 3.7–4.2V supply. The maximum 20m transmission distance depends on obstacles, interference and the connected Bluetooth device. This is a Bluetooth audio receiver module, not a power amplifier. Audio output should be connected to a suitable amplifier input. IC Variant Note: This product may be supplied with different compatible IC variants, including MH-M18 or JL AS208PO1429-25C4. Functionality is specified as equivalent for this product, and the variant will be shipped randomly depending on stock. 📦 Package Includes 1 × MH-M18 Wireless Bluetooth Audio Receiver Board Module
Bluetooth MP3 Decoding Board Module with inbuilt SD Card Slot / USB / FM / and Remote Control
[Audio, Audio Receiver] Bluetooth MP3 Decoder Board Module with USB, SD Card, FM Radio, AUX & Remote Control The Bluetooth MP3 Decoder Board Module is a compact and versatile multimedia audio player designed to add multiple audio playback options to DIY speakers, amplifier systems, home theaters, car audio systems, portable speakers, and custom audio projects. It combines Bluetooth, USB, SD/TF card, AUX input, and FM radio functions in a single convenient module. The module can be connected to a compatible audio amplifier board to create a complete multimedia audio system. It features a clear LCD display for displaying playback information, input mode, track details, and FM frequency. An included IR remote control allows convenient wireless operation from a distance. With support for popular audio formats including MP3, WMA, WAV, FLAC, and APE, the module provides flexible playback options for different music sources. ⭐ Key Features Bluetooth wireless audio receiver Built-in USB port for music playback Built-in SD/TF card slot FM radio function AUX audio input Supports USB / SD / Bluetooth / FM / AUX source selection Stereo digital audio output LCD display for playback information Includes IR remote control Supports folder selection and organized playback Supports Bluetooth stereo audio Hands-free calling support as specified Compact design for easy installation Suitable for DIY audio projects 📋 Technical Specifications Product Type: Bluetooth MP3 Decoder Board Bluetooth: Bluetooth Audio Receiver Audio Output: Stereo Digital Audio Output Input Sources: Bluetooth / USB / SD (TF) Card / AUX / FM USB Support: Yes SD/TF Card Slot: Yes FM Radio: Yes AUX Input: Yes Display: Seven segment Display Remote Control: IR Remote Included Audio Formats: MP3 / WMA / WAV / FLAC / APE Bluetooth Function: Wireless Audio Playback / Hands-Free Calling Playback Function: Folder Selection & Music Playback Installation: Audio Amplifier / DIY Speaker System Application: DIY Speakers, Home Theater, Car Audio, Portable Audio Systems Mounting Type: Panel / Enclosure Mount Power Supply: Refer to the specific module version before connection Output Connection: Connect to a compatible amplifier input Module Type: Multi-Function Audio Decoder Board 🔧 Applications DIY Bluetooth Speakers Portable Speaker Systems Home Theater Upgrades Car Audio Modification Amplifier Projects Multimedia Speaker Repair Custom Audio Systems DIY Music Players Portable Audio Systems Electronic Audio Projects 🛠️ How It Works The module works as a multi-function audio source and decoder. Select Bluetooth, USB, SD/TF card, AUX, or FM radio as the required audio source. The module decodes the selected audio signal and provides a stereo audio output that can be connected to a compatible amplifier board. For a DIY speaker project, connect the decoder module to a suitable amplifier and then connect the amplifier to the speakers. The included IR remote can be used to control playback, mode selection, track selection, volume, and other supported functions. 🔌 Installation Connect the module to a compatible power supply according to the specifications of the particular module version. Connect the audio output to the input of a suitable amplifier board and connect the amplifier output to the speakers. Insert a compatible USB drive or SD/TF card containing supported audio files, or pair the module with a Bluetooth device. AUX input and FM radio can also be selected using the module controls or remote control. 📦 Package Includes 1 × Bluetooth MP3 Decoder Board Module with USB / SD / FM / AUX 1 × IR Remote Control 1 × Power & Signal Connecting Cable ⚠️ Precautions This module is not recommended for beginners without basic electronics knowledge. Check the module's required supply voltage and polarity before powering it. Ensure all wiring is correct before switching on the power. Connect the audio output to a compatible amplifier input. Do not connect speakers directly to the decoder output unless confirmed by the specific module version. Avoid short circuits between power and signal connections. Do not expose the board to water or excessive moisture. We are not responsible for damage caused by incorrect wiring, improper installation, or misuse.