Item specifics
Description
CA-6928 5V Bluetooth Audio Amplifier Board Product Overview
The CA-6928 is a compact, high‑performance Bluetooth 5.0 audio receiver module operating from 3.3‑6V (5V recommended). It supports mono or stereo audio output and features stable wireless reception with a line‑of‑sight range of over 10 meters. The module receives Bluetooth audio from smartphones, tablets, or computers and outputs analog audio to external amplifiers or powered speakers. Ideal for DIY Bluetooth speakers, retrofitting old audio systems, and car audio upgrades. Available in green and blue PCB colors. Custom power‑on voice prompts and Bluetooth device names are available for volume orders.
CA-6928 5V Bluetooth Audio Amplifier Board Core Features
Bluetooth 5.0： Bluetooth 5.0 technology for stable connection, fast pairing, and broad compatibility
Wide Power Supply： 3.3V‑6V DC (5V recommended) – use USB 5V or single Li‑ion battery (3.7‑4.2V)
Stereo Audio Output： Separate left (OUTL/LOUT) and right (OUTR/ROUT) channels for connecting to stereo amplifiers
Stable Signal, Long Range： >10m line‑of‑sight range, low dropout, suitable for home and car use
Compact Size： Small PCB footprint, clearly marked pads for easy embedding
Simple Wiring： Only power and audio output connections needed – plug and play
Customization： Custom power‑on voice and Bluetooth name available for large orders (contact support)
CA-6928 5V Bluetooth Audio Amplifier Board Applications
DIY Bluetooth Speakers： Build portable or desktop wireless speakers
Retrofit Old Hi‑Fi Systems： Add Bluetooth to legacy amplifiers and stereo systems
Car Audio Upgrade： Convert AUX‑in to Bluetooth wireless music streaming
Teaching & Experiments： Demonstrate Bluetooth audio transmission
Public Address Systems： Add Bluetooth input to meeting room or classroom amplifiers
CA-6928 5V Bluetooth Audio Amplifier Board Key Advantages
Plug‑and‑Play, No Programming： Module comes with pre‑loaded Bluetooth stack – power on and pair with your phone, no coding needed
Wide Voltage for Multiple Power Sources： 3.3‑6V works with USB 5V or Li‑ion battery, ideal for portable designs
Stereo Output with Clean Sound： Separate left/right channels deliver clear, noise‑free audio
Reliable Signal & Sufficient Range： 10m+ range meets typical home, office, and car requirements
Compact Form Factor： Small size fits inside speaker enclosures or dashboards
Green or Blue PCB Options： Two color choices for different product aesthetics or preferences
Customizable for Volume Orders： Power‑on voice and Bluetooth name can be tailored – enhance brand identity
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FAQ:
What is the CA-6928 5V Bluetooth audio amplifier board and what does it do?
The CA-6928 is a compact Bluetooth 5.0 receiver module with a built‑in audio power amplifier. It can wirelessly receive stereo audio from a phone, tablet, or computer and directly drive passive speakers with up to a few watts of output power. The board typically includes a 3.5 mm line‑in jack, solder pads for speakers and power, and a USB or terminal block power input. It is designed for DIY wireless speaker projects, retrofitting old wired speakers, adding Bluetooth to car audio, and portable battery‑powered sound systems.
How do I power the CA-6928 module and what is the voltage range?
The module operates from a DC supply of 3.3 V to 6 V, with 5 V being the recommended standard. You can power it from a USB port, a 5 V power adapter, or a single‑cell Li‑ion battery (3.7 V nominal). The power input pads are clearly labelled on the board. The voltage directly affects the amplifier’s output power: at 5 V you can drive a small speaker; at lower voltages the volume will be reduced. Always ensure the power supply can deliver at least 1 A for stable operation without distortion.
How do I pair the CA-6928 with my phone? What is the default Bluetooth name?
Apply power to the module; it will enter pairing mode automatically the first time it is turned on, usually indicated by a rapidly flashing blue LED. On your phone, open Bluetooth settings and scan for new devices. Look for a name such as “CA-6928”, “BT‑SPK”, or similar. Tap to connect—no passcode is required. Once paired, the LED will stop flashing and stay solid. The module automatically reconnects to the last paired device when powered on again.
Can this module output both mono and stereo? How do I switch between them?
The CA-6928 board usually provides a stereo output (left and right speaker pads). If you connect only one speaker, the module may internally mix the two channels to mono, or some variants have a solder jumper or a configuration option to select mono or stereo mode. Check your specific board’s silkscreen for a jumper labelled “MONO‑STEREO” or similar. By default, it often outputs stereo when both channels are connected; leaving one channel disconnected may result in hearing only one channel unless the board is specifically designed to automatically merge to mono.
What is the typical wireless range of this Bluetooth 5.0 receiver?
In an open space without obstacles, the range can reach up to 30 meters (98 feet). Inside a home or car, with walls and metal objects, expect a reliable connection up to 10 meters. Bluetooth 5.0 improves stability and coexistence with Wi‑Fi, but the actual range depends on the antenna design, the transmitting device, and the environment. For best results, keep the module away from large metal surfaces and Wi‑Fi routers.
How can I improve the audio quality and reduce background noise or hiss?
Use a clean, well‑regulated 5 V power supply—noise on the power rail can directly couple into the audio output. Keep the speaker wires short and twisted. If the module has a line‑in jack, ensure no unused audio cable is plugged in, as it can pick up interference. Adding a 100‑470 µF electrolytic capacitor across the power input pads can help filter out hum. The amplifier itself may produce a slight noise floor at maximum volume, which is normal for small low‑cost modules; operate the module at a lower volume setting and amplify externally if necessary.
Can I connect the module directly to a passive speaker, or do I need an external amplifier?
Yes, the CA-6928 has a built‑in class‑D amplifier and is designed to drive passive speakers directly. You connect the speaker wires to the L+ / L‑ and R+ / R‑ pads. The output power is typically 2‑3 W per channel at 5 V into a 4 Ω speaker. For louder sound, you can use a higher‑sensitivity speaker, but do not exceed the maximum voltage rating (6 V) as this may damage the chip. If you need more power, you can feed the line‑out signal (if available) to an external amplifier instead of using the speaker pads.
My module works but the sound is very quiet. What could be wrong?
First, check the supply voltage—lower voltage equals lower output power. Make sure you are using a 5 V supply capable of at least 1 A. Second, verify the speaker impedance: the module is optimized for 4 Ω or 8 Ω speakers; higher‑impedance speakers will produce less volume. Third, some modules have a built‑in volume setting that is reset to a moderate level at power‑on; you may need to increase the volume on your phone or via the module’s buttons (if any). Also, check that the speaker connections are correct and that both speaker wires are making good contact.
What are the most common DIY projects and applications for this Bluetooth amplifier board?
It is used to turn old wired speakers into wireless ones, add Bluetooth to a car stereo without AUX, build portable boomboxes, create wireless headphones, make a DIY Bluetooth speaker from a lunchbox or wooden enclosure, and for simple public‑address or announcement systems. Its small size, flexible power supply, and built‑in amplifier make it a favorite for hobbyists upgrading audio equipment on a budget.
Does the module remember paired devices? How can I clear the pairing list?
Yes, the CA-6928 stores the last paired device and will automatically reconnect to it when powered on. To pair with a new device, you must disconnect the currently connected phone or turn off Bluetooth on that device, then the module will re‑enter pairing mode. To clear all previously paired devices, many modules can be reset by holding a button (if present) during power‑up, or by momentarily shorting a reset pad. If there is no reset option, simply turn off Bluetooth on all previously paired phones and the module will be ready to accept a new connection.