Preamp
About the Preamp PCB
Preamp is an open source PCB design by bengineer91, published on GitHub. It is a 4-layer board measuring 160 × 100 mm, with 358 components from 103 distinct parts.
Other key parts include the TPS630701RNMR, TPS7B8601BQDDARQ1, TPS2000EDGNR, USBLC6-2SC6 and TPS7A0530PDBV. By type, the board carries 138 capacitors, 135 resistors, 23 ICs, 18 connectors, 13 diodes and 12 test points.
It belongs with the audio and displays & leds designs in this gallery.
From the project
USB and Analog Input preamp with digital volume control and DSP
Headphone amplifier with the following features:
- USBC Power Input - 5V, 3.3V, 3.3VA, and 1.8V LDOs - +/-12V split rail switching converter, feeding +/-10V and +/-5V LDOs - ESP32 Module for control and driving a spectrum visualizer OLED display - York Pico USB to I2S module - ADAU1701 DSP - PCM5102A Digital to Analog Converter - PGA2311 digital volume controller
Main components on the Preamp
Preamp bill of materials (BOM)
358 components, 103 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TPS630701RNMR | RNM0015A | U1 |
| 3 | TPS7B8601BQDDARQ1 TPS7B8601B | TI_SO-PowerPAD-8 | U2, U3, U4 |
| 1 | TPS2000EDGNR TPS2000E | Texas_DGN0008G_VSSOP-8-1EP_3x3mm_P0.65mm_EP2x2.94mm_Mask1.846x2.15mm | U5 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U6 |
| 1 | TPS7A0530PDBV | SOT-23-5 | U7 |
| 1 | TPS65131RGE | VQFN-24-1EP_4x4mm_P0.5mm_EP2.45x2.45mm_ThermalVias | U8 |
| 1 | ADM811-3TARTZ-RL7 ADM811 | SOT-143 | U9 |
| 1 | ADAU1701JSTZ-RL ADAU1701 | LQFP-48_7x7mm_P0.5mm | U10 |
| 4 | OPA1678IDR OPA1678 | SOIC-8_3.9x4.9mm_P1.27mm | U11, U13, U20, U21 |
| 1 | 24AA256-I/SN | SOIC8-N_MC_MCH | U12 |
| 1 | TPS7A0518PDBV | SOT-23-5 | U14 |
| 1 | PCM5102APWR PCM5102A | TSSOP-20_4.4x6.5mm_P0.65mm | U15 |
| 1 | TXB0106PW | TSSOP-16_4.4x5mm_P0.65mm | U16 |
| 2 | TPS7A3901DSCR TPS7A39 | Texas_S-PVSON-N10 | U17, U19 |
| 1 | PGA2310UA | SOIC-16W_7.5x10.3mm_P1.27mm | U18 |
| 1 | OPA2156IDR OPA2156xD | SOIC-8_3.9x4.9mm_P1.27mm | U22 |
| 1 | TPA6120A2RGYR TPA6120A | RGY0014A | U23 |
| 1 | Adafruit_Feather_Generic | Adafruit_Feather2 | A1 |
| 1 | York_USB-to-I2S | York_Pico_USB-to-I2S | A2 |
| 1 | Si2371EDS | SOT-23 | Q1 |
Show 83 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MMBT2222A | SOT-23 | Q2 |
| 1 | 12.288M | Crystal_SMD_Abracon_ABM3-2Pin_5.0x3.2mm | Y1 |
| 3 | FTS-102-01-L-S Conn_02x01 | PinHeader_1x02_P1.27mm_Vertical | J1, J11, J13 |
| 2 | Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | J2, J10 |
| 4 | Conn_02x01 | PinHeader_1x02_P2.54mm_Vertical | J3, J6, J8, J12 |
| 1 | USB4125-GF-A-0190 | CONN6_125-GF-A-0190_GCT | J4 |
| 2 | QWIC | JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical | J5, J7 |
| 1 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J9 |
| 2 | Conn_02x03_Odd_Even | PinHeader_2x03_P2.54mm_Vertical | J14, J16 |
| 1 | Conn_02x02_Odd_Even | PinHeader_2x02_P2.54mm_Vertical | J15 |
| 1 | PJRAN2X1U01AUX | CONN6_984x394_SWC_BS | J17 |
| 1 | SJ-63063B | CUI_SJ-63063B | J18 |
| 1 | PEL12D-2225S-S1024 | PEL12D2225SS1024 | MT1 |
| 1 | 7695 | KEYSTONE_7695 | MTG1 |
| 4 | RK09L1120036 | RK09L1120036 | RV1, RV4, RV5, RV6 |
| 2 | 10k | Potentiometer_Bourns_3314G_Vertical | RV2, RV3 |
| 2 | SPDT_Switch | 100AWSP1T2B4M7RE | SW1, SW3 |
| 1 | SPST_MOM_SW | SW4_1825910-B_TEC | SW2 |
| 12 | 5020 | KEYSTONE_5020 | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +4 |
| 11 | APT2012PGW LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5, D6, D9, D10 +3 |
| 2 | MBR120 ~ | D_SOD-123 | D7, D8 |
| 1 | 74438324010 1u | L_Wuerth_MAPI-2512 | L1 |
| 2 | 74438357047 4.7u | L_Wuerth_MAPI-4020 | L2, L3 |
| 5 | GRM32ER71E226ME15L 22u | C_1210_3225Metric | C1, C2, C6, C46, C54 |
| 40 | GRM21BZ71E106KE15L 10u | C_0805_2012Metric | C3, C4, C5, C8, C9, C13, C14, C15 +32 |
| 40 | GCJ188R71C104KA01D 0.1u | C_0603_1608Metric | C7, C22, C29, C45, C47, C48, C49, C50 +32 |
| 11 | GCM188R72A103KA37D 10n | C_0603_1608Metric | C10, C11, C12, C21, C34, C79, C92, C93 +3 |
| 2 | T495C686M016ATE250 68u | CP_EIA-6032-28_Kemet-C | C19, C23 |
| 3 | GRM188Z71C475KE21D 4.7u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C20, C24, C27 |
| 4 | 0805YC105KAT2A 1u | C_0805_2012Metric_HandSolder | C25, C26, C66, C67 |
| 1 | 6.8p | C_0603_1608Metric | C33 |
| 1 | GCM188R71H472KA37J 4.7n | C_0603_1608Metric | C36 |
| 1 | GRM188R71E224KA88D 220n | C_0603_1608Metric | C37 |
| 1 | 7.5p | C_0603_1608Metric | C38 |
| 7 | UCM1V470MCL1GS 47u | CAP_UCD_5X5P8_NCH | C39, C95, C96, C119, C120, C135, C136 |
| 1 | GCM188R71H563KA57D 56n | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C40 |
| 1 | GRM1885C1H332JA01D 3.3n | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C41 |
| 2 | 24p | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C53, C55 |
| 4 | GRM31C5C1H224JE02L 0.22u | C_1206_3216Metric | C56, C58, C105, C131 |
| 2 | GRM188Z71E225ME43D 2.2u | C_0603_1608Metric | C80, C85 |
| 2 | GRM1885C1H222JA01D 2.2n | C_0603_1608Metric | C89, C90 |
| 6 | GRM1885C1E122JA01D 1.2n | C_0603_1608Metric | C106, C107, C110, C124, C127, C128 |
| 4 | GRM1885C1H101JA01D 100p | C_0603_1608Metric | C118, C134, C137, C138 |
| 6 | CRCW0805150RFKEA 270 | R_0805_2012Metric_HandSolder | R1, R2, R18, R27, R77, R78 |
| 1 | 51k | R_0603_1608Metric | R3 |
| 1 | 300k | R_0603_1608Metric | R4 |
| 30 | CRCW060310K0FKEA 10k | R_0603_1608Metric | R5, R6, R7, R10, R11, R24, R25, R26 +22 |
| 3 | CRCW0805150RFKEA 100 | R_0805_2012Metric_HandSolder | R8, R9, R34 |
| 20 | CRCW06030000Z0EA 0 | R_0603_1608Metric | R12, R16, R17, R39, R50, R53, R54, R55 +12 |
| 1 | CRCW060332K4FKEA 1M | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13 |
| 1 | CRCW080532K4FKEA 1M | R_0603_1608Metric | R14 |
| 1 | CRCW060332K4FKEA 1M | R_0603_1608Metric | R15 |
| 1 | CRCW060324K5FKEA 245k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R19 |
| 1 | 245k | R_0603_1608Metric | R20 |
| 1 | CRCW060315K0FKEA 150k | R_0603_1608Metric | R21 |
| 2 | CRCW06035K10FKEA 5.1K | R_0603_1608Metric | R22, R23 |
| 1 | CRCW0603100RFKEA 100 | R_0603_1608Metric | R28 |
| 1 | 1M | R_0603_1608Metric | R29 |
| 1 | 110k | R_0603_1608Metric | R30 |
| 8 | CRCW0603100KFKEA 100k | R_0603_1608Metric | R31, R35, R36, R37, R90, R116, R134, R135 |
| 1 | CRCW06031M00FKEA 1M | R_0603_1608Metric | R32 |
| 1 | CRCW08052K20FKEA 2.2k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R33 |
| 3 | CRCW0603470RFKEA 470 | R_0603_1608Metric | R38, R79, R80 |
| 3 | CRCW060318K0FKEA 18k | R_0603_1608Metric | R40, R45, R51 |
| 2 | CRCW0805820RFKEA 820 | R_0603_1608Metric | R41, R43 |
| 2 | CRCW060356K0FKEA 56k | R_0603_1608Metric | R42, R44 |
| 1 | CRCW0805100RFKEA 100 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R49 |
| 2 | CRCW06032K20FKEA 2.2k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R60, R61 |
| 1 | 3.3k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R68 |
| 1 | 6.8k | R_0603_1608Metric | R69 |
| 1 | CRCW08053K30FKEA 3.3k | R_0603_1608Metric | R70 |
| 1 | CRCW060332K4FKEA 32.4K | R_0603_1608Metric | R81 |
| 1 | CRCW060342K2FKEA 42.2k | R_0603_1608Metric | R82 |
| 2 | CRCW0805150RFKEA 820 | R_0805_2012Metric_HandSolder | R83, R84 |
| 12 | CRCW06031K00FKEA 1k | R_0603_1608Metric | R91, R110, R111, R112, R113, R117, R125, R126 +4 |
| 6 | CRCW06031K80FKEA 1.8k | R_0603_1608Metric | R94, R95, R96, R120, R121, R122 |
| 1 | CRCW060375K0FKEA 75k | R_0603_1608Metric | R97 |
| 1 | CRCW060384K5FKEA 84.5k | R_0603_1608Metric | R98 |
| 4 | CRCW0805820RFKEA 820 | R_0805_2012Metric_HandSolder | R99, R102, R103, R106 |
| 4 | 100 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R109, R114, R130, R133 |
| 2 | 10 | R_1206_3216Metric | R115, R129 |
| 1 | CRCW060327K0FKEA 27k | R_0603_1608Metric | R118 |
| 2 | 2k | R_0603_1608Metric | R123, R124 |
Preamp design files
The KiCad project lives in the bengineer91/Preamp repository on GitHub; these links point at the commit this page was built from.
- Layoutkicad/Preamp_1.kicad_pcb
- Schematickicad/Preamp_1.kicad_sch
Preamp: common questions
How big is the Preamp PCB?
The Preamp measures 160 × 100 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Preamp?
358 components, from 103 distinct parts. The full bill of materials is listed on this page.
Where can I download the Preamp design files?
From the bengineer91/Preamp repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Preamp design in my own project?
The repository has no license, so all rights stay with bengineer91. Use it as a reference, and ask the author before reusing the design.
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