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