florian.berthold
f100eb23bf
Schematic includes: - Power section: SS14 reverse protection, AMS1117-3.3 LDO - RP2040-Zero and OLED module headers - Trigger output: 74LVC1G17 Schmitt buffer - Return input: voltage divider, BAT54 clamps, MCP6001 buffer - Button with pull-up, power LED BOM updated with correct parts and LCSC numbers. ASCII schematic reference in hardware/kicad/README.md.
3.2 KiB
3.2 KiB
SN-L00 Bill of Materials
PCBWay Assembly (LCSC parts)
| Ref | Description | Value | Package | LCSC # | Qty |
|---|---|---|---|---|---|
| C1,C2 | Capacitor, ceramic | 10uF | 0805 | C15850 | 2 |
| C3,C4,C5 | Capacitor, ceramic | 100nF | 0603 | C14663 | 3 |
| R1 | Resistor (button pull-up) | 10K | 0603 | C25804 | 1 |
| R2 | Resistor (LED current) | 1K | 0603 | C21190 | 1 |
| R3 | Resistor (trigger output) | 100R | 0603 | C22775 | 1 |
| R4,R5 | Resistor (input protection) | 10K | 0603 | C25804 | 2 |
| R6 | Resistor (voltage divider) | 22K | 0603 | C25774 | 1 |
| D1 | Schottky diode (reverse polarity) | SS14 | SMA | C2480 | 1 |
| D2 | LED, green (power) | Green | 0603 | C72043 | 1 |
| D3,D4 | Schottky diode (input clamp) | BAT54 | SOD-323 | C181104 | 2 |
| U1 | LDO regulator 3.3V | AMS1117-3.3 | SOT-223 | C6186 | 1 |
| U2 | Schmitt trigger buffer | 74LVC1G17 | SOT-23-5 | C388628 | 1 |
| U3 | Op-amp (input buffer) | MCP6001 | SOT-23-5 | C93025 | 1 |
| J1 | Eurorack power header | 2x5 shrouded | 2.54mm | C429954 | 1 |
| J2,J3 | Thonkiconn jack | PJ398SM | - | C2935955 | 2 |
| SW1 | Tactile switch | 6x6mm | SMD | C127509 | 1 |
Total unique LCSC parts: 16
Hand-Solder Modules
| Ref | Description | Source | Part # | Approx Price | Qty |
|---|---|---|---|---|---|
| MOD1 | RP2040-Zero | AliExpress / Waveshare | RP2040-Zero | ~€2-3 | 1 |
| MOD2 | OLED 128x32 I2C | AliExpress | SSD1306 0.91" | ~€2-3 | 1 |
Alternative sources for modules
RP2040-Zero:
- Waveshare official: https://www.waveshare.com/rp2040-zero.htm (~$4)
- AliExpress: Search "RP2040-Zero" (~€2-3)
- Amazon: Search "RP2040-Zero" (~€5-8)
OLED 128x32 I2C:
- AliExpress: Search "0.91 inch OLED I2C SSD1306" (~€2)
- Amazon: Search "0.91 OLED Arduino" (~€5-7)
- Adafruit: Product 4440 ($13) - quality option
Eurorack Jacks (Alternative Sources)
Thonkiconn PJ398SM may have limited LCSC stock. Alternatives:
- Thonk.co.uk: https://www.thonk.co.uk/shop/thonkiconn/ (€0.40/ea, bulk)
- Exploding Shed: https://www.exploding-shed.com/
- Modular Addict: https://modularaddict.com/
Circuit Description
Power Section
- D1 (SS14): Reverse polarity protection
- U1 (AMS1117-3.3): 12V → 3.3V LDO regulator
- C1,C2: Input/output bulk capacitors (10µF)
- C3: Output decoupling (100nF)
- D2 + R2: Power indicator LED
Trigger Output
- U2 (74LVC1G17): Schmitt trigger buffer for clean edges
- R3 (100Ω): Output current limiting / short protection
- C4: U2 decoupling (100nF)
Return Input
- R4 (10K): Input series protection
- R5/R6 (10K/22K): Voltage divider (5V → 3.1V)
- D3,D4 (BAT54): Overvoltage clamp to rails
- U3 (MCP6001): Rail-to-rail buffer op-amp
- C5: U3 decoupling (100nF)
User Interface
- SW1: Tactile button (mode/trigger)
- R1 (10K): Button pull-up resistor
Estimated Costs
| Category | Cost |
|---|---|
| PCB (5pcs, PCBWay) | ~€5-10 |
| SMD Assembly | ~€15-25 |
| LCSC components | ~€4-6 |
| Hand-solder modules | ~€5-8 |
| Jacks (if separate) | ~€1-2 |
| Total per unit | ~€25-40 |
Prices approximate, bulk reduces significantly