Gecho Loopsynth DIY Kit #3 - Bill of Material
Elements included in the kit are highlighted.
This BOM lists elements as used on first batch of machine-assembled boards.
With R, C and L, there is no need to match part number precisely, an equivalent with a close enough parameters will do and in some case values can be approximate too. If you are not sure, feel free to ask.
Schottky diodes are not too critical either, D1-D3 should have high enough current rating, the rest of them are protective so can be same or lower current.
The price given is as an example of how much the elements cost at small quantities (as required for one board).
| Ref | Value | Mfg. Part Number | Quantity | Unit price | Total | IC1 | MCU ARM M4 1024 FLASH 168 Mhz 192kB SRAM | STM32F405RGT6 | 1 | 8.99 | 8.99 |
|---|---|---|---|---|---|
| IC2 | Stereo DAC | CS43L22-CNZ | 1 | 5.07 | 5.07 |
| IC3 | Op Amp | LMV324IDT | 1 | 0.374 | 0.374 |
| IC4 | USB Interface | CH340G | 1 | 0.85 | 0.85 |
| IC5 | LDO Regulator 3.3V 200mA | XC6221B332MR-G | 1 | 0.519 | 0.519 |
| IC6 | LDO Regulator 2.5V 200mA | XC6221B252MR-G | 1 | 0.519 | 0.519 |
| IRS1-IRS4 | IR Reflective object sensor | QRE1113GR | 4 | 0.731 | 2.924 |
| T1, T2 | MMBT3904 NPN BJT | MMBT3904LT1G | 2 | 0.094 | 0.188 |
| D1-D3 | DIODE SCHOTTKY 40V 200MA | SD0603S040S0R2 | 3 | 0.374 | 1.122 |
| D4-D15 | DIODE SCHOTTKY 40V 30MA | RB751S40 | 12 | (can be left out) | |
| XTAL1 | Crystal 8MHz 30ppm | 7A-8.000MAAE-T | 1 | 0.587 | 0.587 |
| XTAL2 | Crystal 12MHz 30ppm | 7A-12.000MAAE-T | 1 | 0.587 | 0.587 |
| CN1 | CONN MINI USB RCPT RA TYPE B SMD | 690-005-299-043 | 1 | 0.464 | 0.464 |
| BT1-BT6 | Tactile Switches 4.2x3.2x2.5mm 160gf | SKRPABE010 | 6 | 0.259 | 1.554 |
| SW1 | Slide Switches DPDT SMT .3A | JS202011SCQN | 1 | 0.374 | 0.374 |
| LD1, LD4, LD13-LD16 | LED ORANGE CLEAR | LTST-C170KFKT | 6 | 0.211 | 1.266 |
| LD2, LD3, LD17-LD21 | LED BLUE CLEAR | LTST-C171TBKT | 7 | 0.279 | 1.953 |
| LD5-LD12 | LED RED CLEAR | LTST-C171KRKT | 8 | 0.211 | 1.688 |
| LD22-LD29 | LED WHITE | QBLP631-IW | 8 | 0.41 | 3.28 |
| TR1, TR2 | Trimmer SMD 3MM 1M 25% 0.1W | TC33X-2-105E | 2 | (or use the same resistors as R78-R79) | |
| R1-R2 | 33R, 1%, 1/10W | RC0603FR-0733RL | 2 | ||
| R3-R4 | 51R, 1%, 1/10W | RC0603FR-0751RL | 2 | ||
| R5-R14 | 100R, 1%, 1/10W | RC0603FR-07100RL | 10 | (not critical, 51R to 220R is fine to use) | |
| R15-R21 | 220R, 1%, 1/10W | RC0603FR-07220RL | 7 | ||
| R22-R54 | 1k0, 1%, 1/10W | RC0603FR-071KL | 33 | 0.008 | 0.264 |
| R55-R57 | 2k2, 1%, 1/10W | RC0603FR-072K2L | 3 | ||
| R58-R61 | 4k7, 1%, 1/10W | RC0603FR-074K7L | 4 | ||
| R62-R73 | 10k, 1%, 1/10W | RC0603FR-0710KL | 12 | ||
| R74-R77 | 100k, 1%, 1/10W | RC0603FR-07100KL | 4 | ||
| R78-R79 | 510k, 1%, 1/10W | RC0603FR-07510KL | 2 | (value can be approximate) | |
| C1-C7 | 10uF, 6.3V, X5R | CC0603MRX5R5BB106 | 7 | 0.085 | 0.595 |
| C8-C11 | 2.2uF, 6.3V, X5R | CC0603MRX5R5BB225 | 4 | 0.085 | 0.34 |
| C12, C13 | 150pF, 50V, C0G, NP0 | CL10C151JB8NNNC | 2 | (can be left out) | |
| C14, C15 | 22nF, 50V, X7R | CL10B223KB8NNNC | 2 | ||
| C16-C19 | 20pF, 50V, C0G, NP0 | CC0603JRNPO9BN200 | 4 | ||
| C20-C32 | 1uF, 25V, X7R | CL10B105KA8NNNC | 13 | 0.1 | 1.3 |
| C33-C55 | 100nF, 16V, X7R | CL10B104KO8NNNC | 23 | 0.1 | 2.3 |
| L1-L5 | Ferrite Bead 120 Ohm @ 100MHz, 200mA | BLM18TG121TN1D | 5 | 0.085 | 0.425 |
