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
Read layout.
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 components.
Thought for 2 mins 28 sec — Considering tool usage
Placing components.
Thought for 1 min 24 sec — Evaluating LED arrangement
Placing components.
Thought for 39 sec
Placing components.
Thought for 33 sec — Fixing overlaps in layout
Placing components.
Thought for 14 sec — Adjusting layout overlaps
Placing components.
Thought for 8 sec
Placing components.
Thought for 9 sec
Placing components.
Thought for 1 min 5 sec — Evaluating J2 rotation and positioning
Placing components.
Thought for 44 sec
Placing components.
Thought for 16 sec — Checking for overlaps
Placing components.
Thought for 17 sec — Adjusting component placements
Placing components.
Thought for 12 sec — Reviewing net grouping issue
Component 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
Refine this doc
Ask about this doc
Project Specification — STM32 PSRAM Audio Synth Controller
Purpose
Compact ARM Cortex STM32 music synth controller modeled after Daisy Seed with external PSRAM, PCM3060 stereo audio codec, three potentiometers, eight through-hole LEDs, two buttons, USB-C power/data, and a 3.5 mm TRS audio output.
Implemented Architecture
- MCU: STM32H750VBT6 ARM Cortex-M7.
- External memory: APS6404L-3SQR-ZR 64 Mbit QSPI PSRAM.
- Audio codec: PCM3060PW stereo ADC/DAC.
- Power input: USB-C 5 V through USB4215-03-A.
- Main rail: 3.3 V buck regulator based on ST1S10PUR, with 22 uF input/output bulk capacitors and 4.7 uH inductor.
- Controls: three Bourns 10 kΩ potentiometers to ADC inputs with 1 kΩ/100 nF smoothing filters.
- Buttons: two tactile buttons with 47 kΩ pull-ups.
- LEDs: 8 THT LEDs in row-intended order: 3 green, 2 yellow, 3 red; each has a 680 Ω current-limiting resistor.
- Audio output: PCM3060 single-ended left/right outputs through 1 kΩ series resistors to TRS tip/ring; sleeve to ground.
Key Nets and Pin Map
QSPI PSRAM
Table
| Function | STM32 | PSRAM |
|---|---|---|
| NCS | PB10 | ~CE |
| CLK | PB2 | SCLK |
| IO0 | PD11 | SI/SIO0 |
| IO1 | PD12 | SO/SIO1 |
| IO2 | PE2 | SIO2 |
| IO3 | PD13 | SIO3 |
PCM3060 Audio Interface
Table
| Function | STM32 | PCM3060 |
|---|---|---|
| MCLK | PA8 | SCKI1, SCKI2 |
| BCLK | PE5 | BCK1, BCK2 |
| LRCLK | PE4 | LRCK1, LRCK2 |
| DAC data | PE6 | DIN |
| ADC data | PE3 | DOUT |
| Reset | PD3 | RST |
User Controls
Table
| Function | STM32 |
|---|---|
| Pot 1 | PC0 |
| Pot 2 | PC1 |
| Pot 3 | PA0 |
| Button 1 | PB12 |
| Button 2 | PB13 |
| Green LEDs | PE7, PE8, PE9 |
| Yellow LEDs | PE10, PE11 |
| Red LEDs | PE12, PE13, PE14 |
Validation Notes
- ERC review found no schematic electrical errors or warnings.
- DRC currently reports airwires only because placement/routing have not been run yet; these are expected before layout.
- The next phase is compact 4-layer rounded-rectangle PCB setup and neat row placement for knobs/buttons/LEDs, pending user approval.
Purpose
Implemented Architecture
Key Nets and Pin Map
QSPI PSRAM
PCM3060 Audio Interface
User Controls
Validation Notes
