This project is a set of custom, extensible speakers I built for a small portable shop that I designed and constructed.
About a decade ago, I built a TDA2003 20W bridged mono amplifier from a kit. At the time, I didn’t have a clear use for it, so it ended up in storage. When I recently finished building my small shop, I realized it was the perfect opportunity to bring that amp back to life.
My goal was to create a single, “good enough” speaker system for listening to music or podcasts while working on woodworking or electronics projects.
I also wanted the system to be flexible:
- Additional speakers can be daisy-chained.
- The speakers can be powered either by the built-in amplifier or by an external amplifier.
The result is a modular, practical audio setup tailored specifically for a small workshop environment. To improve transient power response and DC input filtering, I added an additional capacitor bank on a separate PCB.
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- Initial release.
- Multiway 6×9 speakers were used to achieve decent sound while minimizing space.
- Black anodized rods on the back panel provide convenient cable-wrapping points.
- The amplifier kit is mono, so the left and right input channels are passively summed to a single output.
- Additional daisy-chained speakers are wired in series to prevent overloading the TDA2003 amplifiers.
- If speakers are connected in parallel, the minimum impedance is determined by the internal 4 Ω speaker.
- The TDA2003 can deliver up to 3.5 A of repetitive peak output current and up to 4.5 A of non-repetitive peak current. The fuse should be sized accordingly.
Educational Use Notice: This project is provided for educational and learning purposes only. You are welcome to read, study, and experiment with this software and/or hardware. It is not intended for commercial use. This software and/or hardware is provided "as is", without warranty of any kind. The author assumes no responsibility for any damages or issues resulting from its use.