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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →This is a DIY 2.1-channel power-amplifier project, not a verified 200-watt retail amplifier. Its detailed description specifies one TDA7294 amplifier for the subwoofer at approximately 100 W and one TDA7265 dual amplifier at approximately 25 W per stereo channel. That is roughly 150 W in total, subject to speaker impedance, supply voltage, distortion, cooling, and transformer capacity.
The design may suit an experienced electronics hobbyist who wants to build a repairable Class-AB home-audio system. It is not a plug-and-play substitute for a commercial receiver, and the mains power supply, enclosure, grounding, thermal management, and crossover are the builder’s responsibility.
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What the project actually is
The project published on Hackaday.io is a completed DIY amplifier build created on April 25, 2022, with later updates indicated on the project page. It has no standard retail model number, independent certification, commercial warranty, or independently verified performance report.
Its intended architecture is:
Audio source
↓
2.1 preamplifier / crossover
├── left signal → TDA7265 → left speaker
├── right signal → TDA7265 → right speaker
└── bass signal → TDA7294 → subwoofer“2.1” means two stereo channels—left and right—plus one normally mono bass channel for a subwoofer. It is not a 5.1 or 7.1 surround receiver. The project’s reference to a “Dolby enabled system” should be treated as the creator’s description; the available project information does not establish licensed Dolby decoding.
#1 Best Overall
- Subwoofer Audio Amplifier Board: 100W+100W Bluetooth 5.0 wireless connection, Bluetooth, USB and AUX audio input, 2.0 channel stereo output, just a little sound distortion. Note: When using AUX mode, please confirm that the Bluetooth connection of this module has been disconnected;
- Treble and Bass Adjustment: This digital Amp board with independent treble and bass adjustment buttons,you can directly adjust the treble and bass through the module, without using the player or speaker;
- Perfect Sound Quality Experience: The audio power subwoofer amplifier module with powerful chip, AM interference suppression function, shielding power inductance, low noise front stage operational amplifier, let you enjoy a more perfect sound quality experience;
- With Protective Function: This Bluetooth Amp module is designed with over-voltage protection, under-voltage protection, over-heat protection, short-circuit protection, with case to protective it;
- Easy Installation and Use: The illustration of each interface is printed on the protective plate, making it easy to install and use even without instructions. Small size: 4.4 in*2.75 in*0.78 in, easy to carry;
The short verdict
This is an interesting educational build for an experienced electronics builder, but the title overstates what the detailed specifications establish. The defensible description is approximately 100 W for the subwoofer plus 25 W × 2 for the satellite channels, or about 150 W nominally across the system—not verified 200 W continuous RMS output.
Choose it if you want to learn analog audio construction and can design a safe dual-rail supply. Avoid it if you need Bluetooth, HDMI ARC, optical input, remote control, a warranty, guaranteed measurements, or a beginner-friendly project.
Power output: why “200 W” needs qualification
| Section | Project description | Proper qualification |
|---|---|---|
| Subwoofer | About 100 W using a TDA7294 | Depends on supply rails, load impedance, distortion, cooling, and transformer current |
| Left and right | 25 W per channel using a TDA7265 | A stated design figure, not a guaranteed continuous measured result |
| Total | About 150 W | Does not reconcile with the project title’s 200 W figure |
Power figures cannot be compared meaningfully without stating speaker impedance, frequency, number of channels driven, total harmonic distortion, supply voltage, and test duration. “Music power,” peak power, RMS or continuous power, and total system power are different measurements.
STMicroelectronics describes the TDA7294 as a 100 V, 100 W DMOS Class-AB audio amplifier for Hi-Fi applications, with thermal shutdown and short-circuit protection. Those device capabilities do not guarantee that every circuit using the IC will deliver 100 W of low-distortion continuous output. ST describes the TDA7265 as a dual Class-AB audio power amplifier for stereo applications.
How the 2.1 signal path works
The power-amplifier ICs do not automatically create a complete 2.1 system. The project requires a suitable preamplifier or crossover to divide the source signal:
- The left and right paths drive the satellite or full-range speakers.
- The low-pass path combines or routes bass information to the mono subwoofer channel.
- Gain controls must be matched so the subwoofer is not excessively loud or too quiet.
- Crossover frequency, phase, and speaker polarity affect how smoothly the bass integrates with the satellites.
A passive crossover and an active preamplifier have different insertion loss, impedance, gain, and adjustment requirements. The project refers to an earlier 2.1 preamplifier design, but the available information is not sufficient to reproduce that entire crossover confidently. Treat it as a required subsystem rather than assuming the amplifier board provides all filtering.
Rank #2
- 3-in-1 multi-function input: This power amplifier board integrates AUX, Bluetooth and USB input methods, allowing you to connect a variety of audio sources as you like. What's more convenient is that you can easily switch between input modes and songs through the dial button, and enjoy the fun of music to the fullest.
- Powerful sound field experience: integrated TDA7498E power amplifier chip, supports 2.1 channel configuration, including left channel, right channel and subwoofer output. The left and right channels provide an output power of 160W each, and the subwoofer reaches a maximum output of 220W, creating an immersive audio experience for you.
- Wide power supply adaptation range: The power amplifier board is suitable for DC15~36V power supply, and also has undervoltage protection function when it is lower than 9V, and supports 12V power supply option. This means that you can choose a suitable power supply method according to your actual needs without worrying about power supply issues.
- Compatible with a variety of speakers: the board is suitable for 30-200W, 4-8Ω speakers, so it can perfectly match with speakers of various specifications. Whether it is a small speaker or a large audio equipment, it can be coordinated with the power amplifier board.
- Perfect protection mechanism: Our power amplifier board has built-in comprehensive protection mechanism, including anti-reverse polarity, undervoltage, overheating, overcurrent and short circuit protection. These smart protection features keep your audio system and speakers safe, so you can enjoy your music with confidence.
The design is intended to drive a passive subwoofer speaker. A commercial amplifier that offers a line-level or powered-subwoofer output may require a different connection method.
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Amplifier ICs and their different supply requirements
The TDA7294 handles the higher-power bass channel, while the TDA7265 provides two lower-power stereo channels. Both are Class-AB devices. They can produce good audio performance, but their output stages dissipate substantial heat at higher levels and are less electrically efficient than a comparable Class-D design.
The project’s technical details state that the TDA7294 uses a higher supply voltage than the TDA7265. The builder used an 18-0-18 V center-tapped transformer and operated the TDA7294 below its potential because of the shared supply arrangement. A dual filtered supply and separate protection fuses are recommended.
Power-supply requirements and mains safety
An 18-0-18 V AC transformer does not produce a guaranteed ±18 V DC supply after rectification. The final rails depend on the rectifier arrangement, filter capacitors, transformer regulation, mains voltage, load, wiring losses, and ripple. Calculate the actual operating rails and current requirements against the latest IC datasheets rather than choosing a supply from the transformer label alone.
The project’s power section includes a 6 A rectifier and large filter capacitors. A suitable build also needs correctly rated fuses, grounding, filtering, an enclosed power section, strain relief, insulated terminals, and wiring sized for the expected current.
Safety warning: Transformer primary wiring can expose you to lethal mains voltage. Large electrolytic capacitors may remain charged after power-off. Do not test an exposed mains-powered prototype casually. Use a qualified person for the mains side, and use a current-limited low-voltage supply where possible during troubleshooting.
Rank #3
- 【MULTIPLE INPUT METHOD】The S200HS-W has multiple input methods such as Bluetooth input, AUX input, USB flash drive input and USB sound card. The vast majority of devices can be used, such as mobile phones, televisions, laptops, etc.
- 【DUAL TPA3221 CHIP】The S200HS-W is equipped with two TPA3221 chips for stereo 2.1 channel output, with a maximum output power of up to 100W * 2+200W and a wide voltage input DC of 12-30V. The large heat sink used allows the amplifier board to operate continuously and efficiently.
- 【WITH DIY PANEL AND AUX EXTENSION CABLE】With this DIY panel, you no longer need to painstakingly measure the punching positions when making Bluetooth speakers. With this panel, you can easily DIY Bluetooth speakers with just a few simple steps.
- 【PROTECTION FUNCTION】S200HS-W Bluetooth power amplifier board has multiple protection mechanisms to ensure its safe operation. It has short-circuit protection, over-current, over-heat, and anti-reverse protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage.
- 【7 * 24 Hours After-sales Service】 Paying Attention To Customer Experience And Satisfying Customers Is Our Service Tenet. If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us At Any Time, We Will Give You a Satisfactory Answer.
Parts and hardware
The project lists or requires the following components:
- TDA7294 and TDA7265 amplifier ICs
- 22 kΩ, 1 kΩ, 18 kΩ, 15 kΩ, 560 Ω, and 4.7 Ω resistors
- 100 nF and 10 nF polyester capacitors
- 1 μF, 47 μF, and 3,300 μF electrolytic capacitors
- A large heatsink, thermal compound, and insulating hardware
- A 6 A rectifier and suitable transformer or dual-rail power supply
- Two-layer PCB, speaker terminals, input connectors, wiring, fuse holders, and protection components
- A ventilated, electrically safe enclosure
The project page provides a schematic PDF and Gerber PCB files. Check the latest files before ordering boards because the creator mentions intended changes to the filtering. Verify component footprints, capacitor polarity, resistor values, IC orientation, connector pinouts, and PCB revisions.
Cooling and electrical isolation
A large heatsink is essential. Thermal shutdown is a protective feature, not a replacement for correct heatsink design. Use thermal compound, provide ventilation, and ensure the heatsink has adequate surface area for the intended load and enclosure temperature.
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Check whether the IC package tabs are electrically connected to any supply or output node. If two devices share a heatsink, use the required mica or other insulating pads, insulating bushings, and hardware. The project specifically warns that one IC must be insulated from the other with a mica sheet to prevent a short circuit. Confirm the exact isolation requirement against the applicable datasheet before applying power.
PCB assembly and first power-up
- Inspect the schematic and latest Gerber files before purchasing parts.
- Confirm every footprint, polarity mark, component value, and connector orientation.
- Keep high-current supply and speaker traces short and wide.
- Keep transformer, rectifier, and mains wiring away from small-signal input wiring.
- Plan the ground scheme carefully to reduce hum and circulating currents.
- Install the ICs securely with correct thermal and electrical isolation.
- Test the transformer, rectifier, filter capacitors, and unloaded rails separately.
- Use a current limiter or series lamp for the first mains power-up.
- Check supply-rail voltages and inspect for abnormal heating or current draw.
- Measure DC offset at each speaker output before connecting speakers.
- Begin testing at low volume with a dummy load or inexpensive test speaker.
Do not connect valuable speakers until the supply rails, output offset, mute or standby wiring, and signal path have been checked.
Speaker compatibility
Do not match speakers solely by a “100 W” label. Check:
Rank #4
- 【Massive 800W Peak Power & Dual TPA3223 Chips】Experience theater-like sound with our dual original Texas Instruments TPA3223 amplifier chips. Delivering a robust 200W + 200W + 400W (Left/Right/Subwoofer) output, this board thrives with a wide 12-42V DC input. Provide higher voltage for greater, cleaner power to drive demanding speaker setups.
- 【6-Knob Studio-Grade Control & Full-Range Output】Take full command of your audio with six independent knobs: Sub Freq, Sub Vol, L/R Treble, L/R Bass, L/R Vol, and Master Vol. Precisely balance your subwoofer and stereo channels. The left/right channels feature full-range, unattenuated output, compatible with full-range, 2-way, or 3-way speakers for versatile setups.
- 【Triple Inputs & Physical Mode Switch】Enjoy versatile connectivity with Bluetooth 5.0 (stable connection), 3.5mm AUX, and USB playback (supports MP3, WAV, FLAC, APE up to 32GB FAT32). The dedicated physical switch makes swapping between Bluetooth, AUX, and USB modes instant and hassle-free.
- 【Comprehensive Protection & DIY Ready】Built for reliability and safety, featuring protection against short-circuit, over-current, over-temperature, and reverse polarity. Includes a pre-soldered ipex antenna and uses a standard 5.5x2.5mm DC jack. Its compact design is perfect for DIY audio projects, custom enclosures, or upgrading home theater systems.
- 【Smart Features & Package Note】Features one-touch control via the multifunction knob (play/pause, skip tracks, reset). The board includes power-on memory to recall your last used mode. Note: Power supply and audio cables are not included, allowing you to choose components that match your specific power and quality needs.
- Nominal impedance and the speaker’s real minimum impedance
- Continuous and peak power handling
- Speaker sensitivity and expected listening distance
- Subwoofer driver size and enclosure design
- Whether the subwoofer is passive or powered
- Whether the transformer and amplifier can handle the chosen load safely
A nominal 4 Ω speaker may present a lower impedance at some frequencies. A speaker’s power rating also does not guarantee loudness or compatibility; amplifier clipping, enclosure tuning, and thermal limits matter just as much.
Troubleshooting guide
No sound
- Confirm the source and input selection.
- Check whether the preamplifier is producing output.
- Verify left, right, and bass signal routing.
- Check power rails, fuses, mute or standby wiring, and speaker terminals.
- Inspect for solder bridges, reversed electrolytics, and thermal shutdown.
Loud hum
Inspect the grounding scheme, transformer placement, input-cable shielding, power-supply ripple, and cable routing. Keep sensitive input wiring away from mains, transformer, rectifier, and high-current supply wiring. Ground loops between the source and amplifier can also cause hum.
Thermal shutdown
Possible causes include an undersized heatsink, excessive output level, a speaker impedance that is too low, a shorted speaker cable, inadequate transformer current, incorrect supply voltage, or poor thermal contact. Check that insulating pads have not been omitted or punctured.
Fuse blows immediately
Do not replace the fuse with a larger one. Check rectifier and capacitor polarity, transformer connections, mains-voltage configuration, solder bridges, shorted ICs, uninsulated tabs, and shorts on the secondary or DC rails.
Distortion or weak bass
Check crossover frequency, subwoofer gain, phase and polarity, preamplifier clipping, supply sag, speaker impedance, feedback-component values, enclosure design, and heatsink temperature.
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“Hi-Fi” is best treated as the project’s design description, not a verified finished-system result. The ICs are intended for high-quality Class-AB audio, but final performance depends on PCB layout, grounding, ripple, input-stage noise, crossover design, speakers, enclosure construction, and thermal behavior.
Best Value
- Subwoofer Audio Amplifier Board: 100W+100W Bluetooth 5.0 wireless connection, Bluetooth, USB and AUX audio input, 2.1 channel stereo output, just a little sound distortion. Note: When using AUX mode, please confirm that the Bluetooth connection of this module has been disconnected
- Treble and Bass Adjustment: This digital Amp board with independent treble and bass adjustment buttons,you can directly adjust the treble and bass through the module, without using the player or speaker
- Perfect Sound Quality Experience: The audio power subwoofer amplifier module with powerful chip, AM interference suppression function, shielding power inductance, low noise front stage operational amplifier, let you enjoy a more perfect sound quality experience
- With Protective Function: This Bluetooth Amp module is designed with over-voltage protection, under-voltage protection, over-heat protection, short-circuit protection, with case to protective it
- Easy Installation and Use: The illustration of each interface is printed on the protective plate, making it easy to install and use even without instructions. Small size: 4.4 in*2.75 in*0.78 in, easy to carry
The available project coverage does not provide independent measurements of frequency response, THD versus power, noise floor, output impedance, or listening performance. Claims such as “minimum noise” or “best output” should therefore not be read as laboratory specifications.
DIY build versus a ready-made 2.1 amplifier
A commercial Class-D alternative is more practical for anyone who wants a working system quickly. The manufacturer’s page for the Fosi Audio BT30D listed a price of $89.99 when checked on August 16, 2026. It lists Bluetooth 5.0, RCA input, bass and treble controls, an adjustable 20–200 Hz subwoofer cutoff, passive-speaker output, passive or active-subwoofer support, and a supplied 24 V/4.5 A adapter. The page also showed a 24-month warranty and 30-day money-back guarantee.
The BT30D’s listed 50 W × 2 plus 100 W figures are maximum ratings and are not automatically equivalent to the DIY project’s claimed output. It is a convenience-oriented Class-D product with a different supply, thermal profile, input set, and upgrade path.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe older Fosi BT30A page listed Bluetooth 5.0 with aptX and aptX HD, RCA input, and 50 W × 2 plus 100 W at 4 Ω, but it was marked sold out when checked. Prices and availability vary by region and date.
Who should build it?
This project makes sense for an experienced hobbyist who wants to learn analog audio electronics, already has a suitable 2.1 crossover plan, understands dual-rail supplies, and can safely handle mains wiring and high-current capacitors. It offers customization and potential component-level repair.
It is a poor choice for a beginner, anyone seeking guaranteed 200 W continuous output, or anyone who needs modern inputs such as HDMI ARC, optical audio, Bluetooth, app control, or multichannel surround decoding.
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