2 layers75.5 × 20 mm
Potentiometer
ajackson2681/codex
The Codex is an attempt at an open-source, distraction-free writing device inspired somewhat by the AlphaSmart Neo (at least the display was).
6 parts1GPL-3.0
2 layers119.6 × 106.5 mm
TapeLooper MainBoard
TheSlowGrowth/TapeLooper10A digital tape looper module for Eurorack or standalone use, built on the Daisy Seed.
- Size
- 119.6 × 106.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 243
- Nets
- 225
- Pads
- 885
- Tracks, vias
- 2,508, 154
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 9 Aug 2021
- Updated
- 22 May 2026
Overview
TapeLooper MainBoard is an open-source printed circuit board by TheSlowGrowth, from the TheSlowGrowth/TapeLooper repository on GitHub. It is a 2-layer board of 119.6 × 106.5 mm with 243 parts on 225 nets, routed with 2,508 tracks and 154 vias.
It is built around the EC4SAW-24S05N, PCA9685PW and MCP6004-E/P, with the 74HC165D, D6R90F1LFS and PTA4543-2010CPB103 among its other parts. Its parts include 109 resistors, 39 capacitors, 26 diodes, 18 ICs and 14 connectors. It belongs with the computers and single-board computers boards of this library.
Main components
8EC4SAW-24S05N
SIP,21.8x9.2mmSIP,21.8x9.2mm Isolated Power Modules ROHSCincon Electronics Co. LTDIsolated Power Modules
PCA9685PW
TSSOP-28-40℃~+85℃ 100kHz~1MHz 16 2.3V~5.5V 25mA 5.5V Built-in PWM TSSOP-28 LED Drivers ROHSNXP SemiconductorsLED Drivers
MCP6004-E/P
PDIP-14-40℃~+125℃ 1.8V~6V 100uA 1MHz 1pA 1pA 23mA 28nV/√Hz@1kHz 2uV/℃ 4 4.5mV 600V/ms 76dB ESD protection Rail-to-Rail Input, Rail-to-Rail Output PDIP-14 Operational Amplifier ROHSMicrochip TechnologyOperational Amplifier
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers
D6R90F1LFS
插件1.3N Black Non-Latching PC Pin Round Button SPST Through Hole Without 插件 Pushbutton Switches ROHSC&KPushbutton Switches
PTA4543-2010CPB103
插件Potentiometers & Variable ResistorsBourns
TL1105SPF250Q
插件-20℃~+70℃ 12V 2.5N 50mA 6mm 6mm 7.5mm PC Pin Rectangular Button SPST Through Hole 插件 Tactile Switches ROHSE-SwitchTactile SwitchesD6R40F1LFS
插件插件 Pushbutton Switches ROHSC&KPushbutton Switches
README
README.mdTapeLooper
A digital tape looper module for Eurorack or standalone use, built on the Daisy Seed.
Features
- 4 stereo or mono tape loop channels - record and play back independent, unsynchronized tape loops
- Motor simulation - playback speed ramps up and down with a configurable rate
- Tape simulation - with drive, grain and warble independently controllable
- Variable playback speed - with Volt/Octave CV control and quarter/half/double/quad speed
- Forward and reverse playback
- Amplitude CV control
- Clean recording — audio records cleanly into loop channels; tape simulation is applied during playback only
- Perfect loop recording - with a small crossfade at the loop point
- SD card storage - save and load loops as 48kHz stereo WAV files
Hardware
Based on the Electrosmith Daisy Seed. Designed to operate as either a Eurorack module or a standalone desktop unit.
Project Structure
dsp/— DSP library: audio processing, loop playback/recording, tape simulationfirmware/— Target firmware: main application, UI, SD card I/Ohardware/— KiCad PCB designs and panel artworklib/— External dependenciesscripts/— Development helper scripts
Development
Requirements
- CMake 3.30+
- clang++ (C++17) for building and running unit tests
- arm-none-eabi-gcc 10-2020-q4 recommended for cross-compiling firmware to the Daisy Seed
- Python 3 with
pip(for pre-commit hooks)
Unit Tests
Tests are written with Google Test. Build and run from the respective tests/ directories:
# DSP library tests
cd dsp/tests && make test
# Firmware tests
cd firmware/tests && make testPre-commit Hook
A pre-commit hook runs clang-format on staged files before each commit. To install:
./scripts/setup-clangformat-precommit-hook.shParts
243| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | 330 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R201, R202, R203, R204, R205, R206, R207, R208, R209, R210, R211, R212, R213, R214, R215, R216 +32 |
| 24 | LED_RED_GREEN_CA | LED_THT:LED_D3.0mm-3 | D201, D202, D203, D204, D205, D206, D207, D208, D401, D402, D403, D404, D405, D406, D407, D408 +8 |
| 16 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C102, C202, C402, C404, C601, C602, C603, C604, C702, C704, C803, C804, C808, C810, C903, C908 |
| 16 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R220, R221, R222, R223, R301, R302, R303, R304, R305, R306, R307, R308, R309, R310, R311, R312 |
| 16 | POTENTIOMETER | ell_passives:9mm_pot | RV501, RV502, RV503, RV504, RV509, RV510, RV511, RV512, RV513, RV514, RV515, RV516, RV517, RV518, RV519, RV520 |
| 12 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R701, R703, R707, R710, R901, R903, R907, R909, R913, R915, R919, R921 |
| 12 | PJ398SM | ell_connectors:THONKICONN | J701, J702, J703, J704, J901, J902, J903, J904, J905, J906, J907, J908 |
| 8 | 1n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C901, C902, C904, C905, C906, C907, C909, C910 |
| 7 | 47k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R101, R102, R103, R104, R105, R106, R219 |
| 4 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C101, C201, C401, C403 |
| 4 | 200k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R906, R912, R918, R924 |
| 4 | 4051 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U601, U602, U603, U604 |
| 4 | 481k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R905, R911, R917, R923 |
| 4 | 4u7 | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C801, C805, C806, C811 |
| 4 | 560p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C701, C703, C705, C706 |
| 4 | 68k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R904, R910, R916, R922 |
| 4 | 78k7 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R902, R908, R914, R920 |
| 4 | 8k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R702, R704, R706, R709 |
| 4 | C&K 7105SYCQE | ell_special:7105SYCQE-1P3T-SP3T-Switch | SW301, SW303, SW305, SW307 |
| 4 | D6R90F1LFS | ell_special:CK-D6R_Pushbutton | SW302, SW304, SW306, SW308 |
| 4 | PTA4543-2010CPB103 | Potentiometer_THT:Potentiometer_Bourns_PTA4543_Single_Slide | RV505, RV506, RV507, RV508 |
| 3 | 47u | Capacitor_SMD:CP_Elec_6.3x5.8 | C802, C807, C809 |
| 3 | PCA9685PW | Package_SO:TSSOP-28_4.4x9.7mm_P0.65mm | U201, U401, U402 |
| 3 | TL1105SPF250Q | Button_Switch_THT:SW_PUSH_6mm | SW201, SW202, SW203 |
| 2 | 1N5819 | Diode_SMD:D_SOD-123 | D801, D802 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R705, R708 |
| 2 | 2k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R801, R802 |
| 2 | 4.7mH | Inductor_SMD:L_1210_3225Metric_Pad1.42x2.65mm_HandSolder | L803, L804 |
| 2 | 4k7 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R217, R218 |
| 2 | 74HC165 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U605, U606 |
| 2 | AZ1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U802, U804 |
| 2 | Bead | Inductor_SMD:L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | L801, L802 |
| 2 | MCP6004 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U901, U902 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J801 |
| 1 | D6R40F1LFS | ell_special:CK-D6R_Pushbutton | SW204 |
| 1 | DAISY_SEED | ell_special:Daisy_Seed | U101 |
| 1 | EC4SAW-24S05N | ell_special:EC4SAW_DC_DC_SIP8 | U805 |
| 1 | LM4040DBZ-10 | Package_TO_SOT_SMD:SOT-23 | U803 |
| 1 | LM4040DBZ-5 | Package_TO_SOT_SMD:SOT-23 | U801 |
| 1 | Micro_SD_Card | ell_connectors:PJS008U-3000 | J101 |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP801 |
| 1 | TL074 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U701 |
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Questions
How big is the TapeLooper MainBoard PCB?
It measures 119.6 × 106.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TapeLooper MainBoard use?
243 parts, built around the EC4SAW-24S05N, PCA9685PW, MCP6004-E/P and 74HC165D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the TapeLooper MainBoard KiCad files?
From the TheSlowGrowth/TapeLooper repository on GitHub, at the commit this page was made from: the board is hardware/mainboard/TapeLooper_MainBoard.kicad_pcb and its schematic hardware/mainboard/AudioIO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TapeLooper MainBoard design in my own project?
Its repository states no licence, so its author keeps all rights: ask TheSlowGrowth before reusing the design.