4 layers60.6 × 100 mm
Theremin
adeboni/eurorack
This repository stores various eurorack module designs I've made
110 parts1GPL-3.0
2 layers50.5 × 128.5 mm
OpenThereminV45
GaudiLabs/OpenThereminV4249Open Source Theremin Instrument
- Size
- 50.5 × 128.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 107
- Nets
- 113
- Pads
- 398
- Tracks, vias
- 1,583, 191
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 23 Mar 2021
- Updated
- 8 Dec 2025
Overview
OpenThereminV45 is an open-source printed circuit board by GaudiLabs, from the GaudiLabs/OpenThereminV4 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 50.5 × 128.5 mm with 107 parts on 113 nets, routed with 1,583 tracks and 191 vias.
It is built around the ATMEGA328P-AU, MCP4922-E/SL and CH340G, with the MCP4921-E/SN, MCP6002T-I/SN(MS) and TTP223-TD among its other parts. Its parts include 36 capacitors, 22 resistors, 15 connectors, 12 ICs and 6 crystals. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
11
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MCP4922-E/SL
SOIC-14-40℃~+125℃ 0.2LSB 12 2 2.7V~5.5V 350uA 4.5us Power-on reset、Power-down mode、Multi-chip synchronization、Programmable gain SPI Voltage Buffer SOIC-14 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)
CH340G
SOP-16-40℃~+85℃ 2Mbps 3.3V、5V USB 2.0 USB to UART SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
MCP4921-E/SN
SOIC-8-40℃~+125℃ 1 12 175uA 2.7V~5.5V 4.5us 4LSB Power-on reset、Power-down mode、Programmable gain SPI Voltage Buffer SOIC-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)
MCP6002T-I/SN(MS)
SOP-8-2.75V~-1.35V、1.35V~2.75V -55℃~+125℃ 1.2V/us 1.5MHz 1pA 2 2.1V~5.5V 2pA 500uV 50uA 650nV/℃ 95dB Built-in compensation、Zero drift / auto-zero Rail-to-Rail Input, Rail-to-Rail Output SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
TTP223-TD
SOT-23-6-20℃~+70℃ 1 2V~5.5V 3.5uA Capacitive Touch Yes SOT-23-6 Touch Sensors ROHSTDSEMICTouch Sensors
74HC4060D
SO-16-40℃~+125℃ 1 29ns 2V~6V 95MHz Asynchronous Divide-by-2 Falling Edge Up Counter SOIC-16 Counters, Dividers ROHSNexperiaCounters / Dividers74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip FlopsHEF4069UBT
SO-14-40℃~+125℃ 1 1V~2.5V 1uA 3.4mA 3.4mA 30ns@15V,50pF 3V~15V 4.95V、9.95V、14.95V 4000B Series 4V~12.5V 6 SOIC-14 Inverters ROHSNexperiaInverters
LP2985-33DBV
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 16V 3.3V 30uVrms 45dB@(1kHz) 575mV@(150mA) 850uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Noise bypass terminal Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsBB914
-- Diodes - Variable Capacitance ROHSInfineon TechnologiesDiodes - Variable Capacitance
README
README.mdOpenThereminV4
Open Source Theremin Instrument
Schematics, printed circuit board (PCB) design, bill of materials (BOM) and Arduino UNO compatible software for the OpenTheremin V4
Open Source Theremin based on the Arduino Platform
OpenTheremin is an arduino based real Therein instrument. The legendary music instrument was invented by Leon Theremin back in 1920. The theremin is played with two antennas, one to control the pitch and one for volume. The electronic shield with two ports to connect those antennas comprises two heterodyne oscillators to measure the distance of the hand to the antenna when playing the instrument. The resulting signal is fed into a AtMega328P microcontroller. After linearization and filtering the circuit generates the instruments sound that is then played through a high quality digital analog audio converter on the board. The characteristics of the sound can be determined by a wave table on the arduino.
For more info on the open source project and on availability of ready made shield see:
http://www.gaudi.ch/OpenTheremin/
Installation
- Open up the Arduino IDE
- Open the File "Open_Theremin_V4.ino"
- Selecting the correct usb port on Tools -> Serial Port
- Select the correct arduino board from Tools -> Board
- Upload the code by clicking on the upload button.
Parts
107| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100nF | Capacitor_SMD:C_0603_1608Metric | C6, C13, C23, C24, C25, C26, C27, C28 |
| 7 | 150pF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C7, C8, C9, C10 |
| 6 | 100k | Resistor_SMD:R_0603_1608Metric | R3, R4, R7, R8, R15, R16 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C20, C21, C30, C32, C33, C35 |
| 5 | 2.2k | Resistor_SMD:R_0603_1608Metric | R2, R6, R9, R10, R20 |
| 5 | 22pF | Capacitor_SMD:C_0603_1608Metric | C15, C16, C17, C18, C34 |
| 4 | 10k | GaudiLabsFootPrints:PS15NV60 | P1, P2, P3, P4 |
| 4 | 4.7M | Resistor_SMD:R_0603_1608Metric | R1, R5, R11, R13 |
| 4 | 470 | Resistor_SMD:R_0603_1608Metric | R12, R14, R18, R19 |
| 2 | 10n | Capacitor_SMD:C_0603_1608Metric | C22, C38 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric | C36, C37 |
| 2 | 1mH CC453232A-102KL | GaudiLabsFootPrints:COIL_T | L1, L2 |
| 2 | 470pF | Capacitor_SMD:C_0603_1608Metric | C5, C12 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R21, R22 |
| 2 | 74HC4060D | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2, U3 |
| 2 | BB914 | TO_SOT_Packages_SMD:SOT-23 | D1, D2 |
| 2 | GND | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P9, P16 |
| 2 | MCP4922-E/SL | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U7, U12 |
| 2 | MountPad3 | GaudiLabsFootPrints:SMTSOB_M3 | Y1, Y2 |
| 2 | PLUG_3_5_SMD SJ-3502-SMT-TR | GaudiLabsFootPrints:SJ-3502-SMT-TR | Y3, Y7 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 10pF | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C29 |
| 1 | 16MHz | Crystal:Crystal_SMD_HC49-SD | X1 |
| 1 | 47pF | Capacitor_SMD:C_0603_1608Metric | C14 |
| 1 | 7.3721MHz | Crystal:Crystal_SMD_HC49-SD | X2 |
| 1 | 74HC74 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | A0_PAD | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P14 |
| 1 | A1_PAD | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P13 |
| 1 | A2_PAD | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P12 |
| 1 | A3_PAD | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P11 |
| 1 | ATmega328P-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U9 |
| 1 | BUTTON | GaudiLabsFootPrints:SensorButton | P10 |
| 1 | CH340G | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U10 |
| 1 | Conn_02x03_Odd_Even | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J2 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical_SMD | J3 |
| 1 | DualLED 156125RB73000 | GaudiLabsFootPrints:WL-SBRW | D3 |
| 1 | FIDUCIAL1 | GaudiLabsFootPrints:Fiducial_1mm_Dia_2.54mm_Outer_CopperBottom | W1 |
| 1 | FIDUCIAL2 | GaudiLabsFootPrints:Fiducial_1mm_Dia_2.54mm_Outer_CopperBottom | W2 |
| 1 | GND_PAD | GaudiLabsFootPrints:GNDPad | GROUND1 |
| 1 | HEF4069 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U5 |
| 1 | LOGO | GaudiLabsLogos:OTV4_TextBack | G*** |
| 1 | LOGO | GaudiLabsLogos:Peace_logo | G*** |
| 1 | LOGO | GaudiLabsLogos:OTV4_Button | G*** |
| 1 | LOGO | GaudiLabsLogos:OSHW_OT3 | G*** |
| 1 | LOGO | GaudiLabsLogos:OTV4_MrTheremin | G*** |
| 1 | LOGO | GaudiLabsLogos:OTV4_TripodNarrow | G*** |
| 1 | LOGO | GaudiLabsLogos:OTV4_OTTextNarrow | G*** |
| 1 | LOGO | GaudiLabsLogos:OTV4_FrontText | G*** |
| 1 | LP2985-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U11 |
| 1 | MCP4921-E/SN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | MCP6002T-I/SN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | TTP223 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle 12401610E4#2A | GaudiLabsFootPrints:USB_C_Receptacle_Amphenol_12401610E4-2A | J1 |
| 1 | VCC | GaudiLabsFootPrints:SMD_Pinheader_1_OT_BLANK | P8 |
| 1 | not assembled | Capacitor_SMD:C_0603_1608Metric | C4 |
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Questions
How big is the OpenThereminV45 PCB?
It measures 50.5 × 128.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OpenThereminV45 use?
107 parts, built around the ATMEGA328P-AU, MCP4922-E/SL, CH340G and MCP4921-E/SN. 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 OpenThereminV45 KiCad files?
From the GaudiLabs/OpenThereminV4 repository on GitHub, at the commit this page was made from: the board is Electronics/OpenThereminV45.kicad_pcb and its schematic Electronics/OpenThereminV45.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenThereminV45 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).