Music Synth Controller Design
Worked for 10 mins 15 sec
Thought for 3 sec
1/3 Set compact rounded-rectangle board size and 4-layer stackup
Accessed knowledge for the next task.
Thought for 1 sec
Getting a layout overview.
Thought for 7 sec — Considering layout size
Editing board size.
Thought for 2 sec
2/3 Place components by functional block without routing traces
Set compact rounded-rectangle board size and 4-layer stackup
Place components by functional block without routing traces
Review placement for overlaps and airwires-only expected DRC
Accessed knowledge for the next task.
Thought for 9 sec
Baking PCB layout data.
Running placement agent.
Thought for 3 sec
Placing footprints.
Thought for 2 mins 28 sec — Considering tool usage
Placing footprints.
Thought for 1 min 24 sec — Evaluating LED arrangement
Placing footprints.
Thought for 39 sec
Placing footprints.
Thought for 33 sec — Fixing overlaps in layout
Placing footprints.
Thought for 14 sec — Adjusting layout overlaps
Placing footprints.
Thought for 8 sec
Placing footprints.
Thought for 9 sec
Placing footprints.
Thought for 1 min 5 sec — Evaluating J2 rotation and positioning
Placing footprints.
Thought for 44 sec
Placing footprints.
Thought for 16 sec — Checking for overlaps
Placing footprints.
Thought for 17 sec — Adjusting component placements
Placing footprints.
Thought for 12 sec — Reviewing net grouping issue
Footprint placement complete.
Applying placement changes.
it's okay for board to be double sided by the way
Thought for 11 sec
Understood — I’ll allow bottom-side placement for small passives if it improves spacing, while keeping knobs, LEDs, buttons, USB-C, audio jack, MCU, codec, and PSRAM on top for usability and assembly clarity.
Worked for 3 mins 1 sec
Done — the board is now a compact 100 × 75 mm rounded rectangle with a 4-layer stackup.
Components are arranged logically without routing traces: pots in a neat row, LEDs in order below them, two buttons below/near the LED row, USB-C on the left edge, audio jack on the right edge, MCU/PSRAM central, codec near audio, and power near USB. I allowed small resistors/capacitors on the bottom side while keeping all user-facing parts and major ICs on top; placement checks are clean, and the remaining review items are expected unrouted airwires only.
Run focused DRC
Route critical nets
Add mechanical features
Export placement report
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Power Budget — STM32 PSRAM Audio Synth Controller
Assumptions
- USB-C provides 5 V input.
- STM32H750 used at high clock with USB, audio and QSPI active.
- LEDs are intentionally low-current indicators at approximately 1–2 mA each using 680 Ω resistors.
- PCM3060 analog rail is powered from the 5 V input; digital rail is 3.3 V.
Load Estimate
Table
| Load | Rail | Conservative current |
|---|---|---|
| STM32H750VBT6 | 3.3 V | 200–300 mA |
| APS6404L QSPI PSRAM | 3.3 V | 30–60 mA |
| PCM3060 digital VDD | 3.3 V | 10–20 mA |
| 8 LEDs at low current | 3.3 V | 16 mA |
| Pots, pulls, misc. | 3.3 V | 2–5 mA |
| 3.3 V subtotal | 260–400 mA design allowance | |
| PCM3060 analog VCC | 5 V | 40–80 mA allowance |
Regulator Sizing
The 3.3 V rail is implemented with an ST1S10PUR buck regulator rather than a linear LDO. This avoids excessive heat from a 5 V to 3.3 V drop at several hundred milliamps. The selected regulator has ample current margin for the estimated 260–400 mA load.
Notes
- USB-C CC1/CC2 each use 5.1 kΩ pulldowns to request default 5 V sink power.
- Main 3.3 V output uses 22 uF bulk capacitance and local 100 nF decoupling at IC rails.
- PCM3060 VCC/VDD/VCOM follow datasheet decoupling guidance with local 100 nF capacitors; large-value codec bulk/VCOM caps should be reviewed during layout/BOM refinement if more audio-noise margin is desired.
Assumptions
Load Estimate
Regulator Sizing
Notes
