2 layers152.9 × 58.6 mm
Mini sequencer
hackclub/OnBoard
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73 parts915
2 layers94.6 × 25 mm
Slider synth
udu3324/slider-synth8A esp32 based synth that uses a touch pot and fsr.
- Size
- 94.6 × 25 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 70
- Pads
- 215
- Tracks, vias
- 421, 58
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Jul 2025
- Updated
- 29 Mar 2026
Overview
Slider synth is an open-source printed circuit board by udu3324, from the udu3324/slider-synth repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 94.6 × 25 mm with 50 parts on 70 nets, routed with 421 tracks and 58 vias.
It is built around the LM386, MCP4922-E/P and SEN-08681, with the PJ-325C5-G, SS14 and USB4105-GF-A among its other parts. Its parts include 16 capacitors, 14 resistors, 5 ICs, 5 diodes and 4 connectors. It belongs with the audio and music boards and the ESP32 boards of this library.
Main components
6
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
MCP4922-E/P
PDIP-14-40℃~+125℃ 0.25LSB、4LSB 12 2 2.7V~5.5V 350uA 4.5us Power-on reset、Power-down mode、Programmable gain SPI Voltage Buffer PDIP-14 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)SEN-08681
-0mm~500mm 10V - Position Sensors ROHSSparkFun ElectronicsPosition Sensors
PJ-325C5-G
插件-20℃~+70℃ 3.5mm Headphone Jack 30V 500mA 插件 Audio Connectors ROHSXKB ConnectionAudio Connectors (Headphones)
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
USB4105-GF-A
SMD-40℃~+85℃ 1 12P 48V 5A Black Female Surface Mount, Right Angle Type-C USB 2.0 SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.mdSlider Synth
A synth that uses a linear touch sensor with a force sensor underneath to create cool sounds. It is inspired by the modulin by wintergatan. Powered by the esp32-s3 and mozzi library.
Purpose
I built this pcb to make my diy setup more professional. I originally hooked everything up with an arduino but was really hard to cary around without dropping the breadboard or unplugging something. This design leaves it hot pluggable as well as super professional and more polished.
Schematic
Additional Notes
BOM
I am supplying my own esp32-s3, rotary encoder, buttons, leds, and some other stuff that would cause the price to spike up to $30
I also have the linear softpot potentiometer, force sensitive resistor, and plywood strip on hand. They total about $50 (plywood was scrap/free)
Before fabricating the pcb, make sure the traces for the FSR is going to IO4 and not IO38!!!
| Price | Part Number | Type | LCSC Part | Owner | Designators | Qty | Manufacturer |
|---|---|---|---|---|---|---|---|
| $0.02 | CL21A106KAYNNNE | Basic | C15850 | System | C4 | 2 | JLCPCB |
| $0.17 | CL21A476MQYNNNE | Basic | C16780 | System | C3,C43,C45 | 6 | JLCPCB |
| $0.03 | SS14 | Basic | C2480 | System | D1 | 2 | JLCPCB |
| $0.02 | CL21B105KBFNNNE | Basic | C28323 | System | C1 | 2 | JLCPCB |
| $2.11 | LM3940IMPX-3.3/NOPB | Extended | C544820 | System | U2 | 2 | JLCPCB |
| $0.05 | CC0805KRX7R9BB104 | Basic | C49678 | System | C48,C49,C5,C50,C6,C7 | 12 | JLCPCB |
| $0.37 | LM386 | Extended | C5157706 | System | U33,U34 | 4 | JLCPCB |
| $0.03 | CL21B474KBFNNNE | Basic | C13967 | System | C2 | 2 | JLCPCB |
| $0.01 | 0805W8F0000T5E | Basic | C17477 | System | R4,R5,R6 | 6 | JLCPCB |
| $5.35 | MCP4922-E/SL | Extended | C39851 | System | U32 | 2 | JLCPCB |
| $0.01 | 0805W8F1002T5E | Basic | C17414 | System | R13,R3 | 4 | JLCPCB |
| $0.01 | 0805W8F100JT5E | Basic | C17415 | System | R28,R29 | 4 | JLCPCB |
| $2.24 | USB4105-GF-A-120 | Extended | C5184243 | System | J1 | 2 | JLCPCB |
| $0.03 | 0805B333K500NT | Basic | C1739 | System | C42,C44 | 4 | JLCPCB |
| $0.01 | 0805W8F3300T5E | Basic | C17630 | System | R10,R11,R8,R9 | 8 | JLCPCB |
| $0.05 | CL21B473KBCNNNC | Basic | C53134 | Customer | C46,C47 | 4 | JLCPCB |
| $0.01 | 0805W8F5101T5E | Basic | C27834 | System | R1,R2 | 4 | JLCPCB |
| $23.28 | Total Part Price | ||||||
| $37.24 | Merchandise Total | ||||||
| $26.56 | Shipping Estimate | ||||||
| $5.27 | Sales Tax | ||||||
| $20.49 | Customs duties & taxes | ||||||
| $89.56 | Grand Total |
Actual total would be around ~$150 USD including my own components sourced.
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1μF | Capacitor_SMD:C_0805_2012Metric | C5, C6, C7, C48, C49, C50 |
| 4 | 330Ω | Resistor_SMD:R_0805_2012Metric | R8, R9, R10, R11 |
| 4 | LED | LED_THT:LED_D5.0mm | D3, D4, D5, D6 |
| 3 | 0Ω | Resistor_SMD:R_0805_2012Metric | R4, R5, R6 |
| 3 | 47μF | Capacitor_SMD:C_0805_2012Metric | C3, C43, C45 |
| 2 | 10kΩ | Resistor_SMD:R_0805_2012Metric | R3, R13 |
| 2 | 10Ω | Resistor_SMD:R_0805_2012Metric | R28, R29 |
| 2 | 33nF | Capacitor_SMD:C_0805_2012Metric | C42, C44 |
| 2 | 47nF | Capacitor_SMD:C_0805_2012Metric | C46, C47 |
| 2 | 5.1kΩ | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | Conn_01x01_Pin | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3, J4 |
| 2 | LM386 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U33, U34 |
| 2 | SW_SPST | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | 0.47μF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 10μF | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 3362P-100kΩ | 2_udu_lib:POT_3362P | RV2 |
| 1 | ESP32-S3-WROOM-2 | RF_Module:ESP32-S3-WROOM-2 | U1 |
| 1 | Force Sensitive Resistor 500mm | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | R12 |
| 1 | LM3940IMPX-3.3/NOPB | EasyEDA:SOT-223-4_L6.5-W3.5-P2.30-LS7.0-BR | U2 |
| 1 | LOGO | 1_udu_lib:slider_synth_back | G*** |
| 1 | MCP4922 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U32 |
| 1 | PJ-325C5-G | Connector_Audio:Jack_3.5mm_CUI_SJ1-3535NG_Horizontal | J2 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW3 |
| 1 | SEN-08681 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | RV1 |
| 1 | SS14 | Diode_SMD:D_SMA | D1 |
| 1 | USB4105 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
Questions
How big is the Slider synth PCB?
It measures 94.6 × 25 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Slider synth use?
50 parts, built around the LM386, MCP4922-E/P, SEN-08681 and PJ-325C5-G. 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 Slider synth KiCad files?
From the udu3324/slider-synth repository on GitHub, at the commit this page was made from: the board is pcb/slider-synth/slider-synth.kicad_pcb and its schematic pcb/slider-synth/slider-synth.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Slider synth design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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