Description
Overview
Brick 300 is a no-drama Class-D power amp: a TPA3255 board done properly, with attention paid to the unglamorous parts — grounding, soft-start, and a clean balanced input.
Class-D modules sound as good as their implementation. Most of the build time went into layout and grounding, not the audio path itself.
Bench results
- Idle noise below the threshold of audibility on efficient speakers
- Clean clipping with no rail-sticking on the scope
- Heatsink barely warm at sustained listening levels
Specifications
| Output | 2× 150 W into 8 Ω |
|---|---|
| Supply | 48 V SMPS |
| Input | Balanced XLR + RCA |
|---|---|
| Idle noise | < -100 dBV A-weighted |
Bill of Materials
| Component | Qty | Unit | Unit Price | Total | Notes | Buy |
|---|---|---|---|---|---|---|
| TPA3255 amplifier board | 1 | €38.00 | €38.00 | |||
| 48 V 350 W SMPS | 1 | €32.00 | €32.00 | |||
| Balanced input board | 1 | €16.00 | €16.00 | |||
| Aluminium chassis + IEC inlet | 1 | €34.00 | €34.00 | |||
| Soft-start + wiring | 1 | €12.00 | €12.00 |
Build Guide
Plan the chassis and grounding
2 h- Keep the SMPS and amp grounds joined at exactly one point.
Wire power and soft-start
2 hAdd balanced input buffers
1.5 hBench test
2 h- Test into a resistive dummy load before you ever connect a speaker.
Discussion
No discussions yet — ask a question or share your progress with the build.