2 layers50 × 100 mm
Theremin
harrydshill/LittleTheremin
A small fully-analogue theremin, with pitch and volume control
108 parts
2 layers50 × 100 mm
Theremin
harrydshill/LittleThereminA small fully-analogue theremin, with pitch and volume control
- Size
- 50 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 115
- Nets
- 77
- Pads
- 312
- Tracks, vias
- 734, 303
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Apr 2026
- Updated
- 11 Oct 2026
Overview
Theremin is an open-source printed circuit board by harrydshill, from the harrydshill/LittleTheremin repository on GitHub. It is a 2-layer board of 50 × 100 mm with 115 parts on 77 nets, routed with 734 tracks and 303 vias.
It is built around the OPA1679ID, LM13700M and LM331N. Its parts include 40 resistors, 39 capacitors, 8 ICs, 3 connectors and 2 inductors.
Main components
3
OPA1679ID
SOIC-14-18V~-2.25V、2.25V~18V、4.5V~36V -40℃~+85℃ 0.0001% 2.5mA 4-Channel ESD protection SOIC-14 Audio Amplifiers ROHSTexas InstrumentsAudio Amplifiers
LM13700M
SOIC-16-16V~-4.75V、4.75V~16V 0℃~+70℃ 110dB 2 2.6mA 20mA 400nA 4mV 50V/us 600nA 9.5V~32V SOIC-16 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
LM331N
DIP-8Internal reference source、Overload protection、Temperature compensation、Full-scale frequency adjustable DIP-8 V/F and F/V Converters ROHSHGSEMIAnalog To Digital Converters (ADC)
README
README.mdLittleTheremin
A small fully-analogue theremin, with pitch and volume control
Status
Mostly finished but with a mistake in the PCB that needs to be reordered 😱
Parts
115| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10k | Resistor_SMD:R_0805_2012Metric | R2, R6, R11, R13, R20, R22, R25, R26, R27, R31, R33 |
| 10 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C8, C9, C16, C20, C22, C29, C33, C34, C35 |
| 7 | 100k | Resistor_SMD:R_0805_2012Metric | R8, R10, R12, R15, R24, R30, R34 |
| 5 | 10n | Capacitor_SMD:C_0805_2012Metric | C25, C26, C27, C28, C32 |
| 4 | 1u | Capacitor_SMD:C_0805_2012Metric | C30, C36, C38, C39 |
| 4 | 470 | Resistor_SMD:R_0805_2012Metric | R16, R17, R28, R29 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 4.7M | Resistor_SMD:R_0805_2012Metric | R1, R3, R5 |
| 2 | 0-80p | Capacitor_SMD:C_Trimmer_Voltronics_JR | C2, C10 |
| 2 | 10p | Capacitor_SMD:C_0805_2012Metric | C3, C11 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric | C21, C23 |
| 2 | 2.2k | Resistor_SMD:R_0805_2012Metric | R4, R37 |
| 2 | 20k | Resistor_SMD:R_0805_2012Metric | R19, R36 |
| 2 | 220p | Capacitor_SMD:C_0805_2012Metric | C5, C12 |
| 2 | 33p | Capacitor_SMD:C_0805_2012Metric | C6, C7 |
| 2 | 470p | Capacitor_SMD:C_0805_2012Metric | C19, C31 |
| 2 | 50k | Potentiometer_SMD:Potentiometer_Bourns_3224W_Vertical | RV1, RV2 |
| 2 | OPA1679 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4, U5 |
| 1 | 1.2k | Resistor_SMD:R_0805_2012Metric | R40 |
| 1 | 100p | Capacitor_SMD:C_0805_2012Metric | C24 |
| 1 | 100u | Capacitor_SMD:C_0805_2012Metric | C37 |
| 1 | 150p | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric | R21 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R23 |
| 1 | 1m | Inductor_SMD:L_Coilcraft_LPS3314 | L1 |
| 1 | 2.4n | Capacitor_SMD:C_0805_2012Metric | C14 |
| 1 | 2.7u | Capacitor_SMD:C_0805_2012Metric | C17 |
| 1 | 240p | Capacitor_SMD:C_0805_2012Metric | C18 |
| 1 | 270p | Capacitor_SMD:C_0805_2012Metric | C13 |
| 1 | 27k | Resistor_SMD:R_0805_2012Metric | R7 |
| 1 | 33k | Resistor_SMD:R_0805_2012Metric | R18 |
| 1 | 3m | Inductor_SMD:L_Coilcraft_LPS3314 | L2 |
| 1 | 40106 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | 4060B | Package_SO:SOP-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | 4070 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | 47k | Resistor_SMD:R_0805_2012Metric | R35 |
| 1 | 500 | Resistor_SMD:R_0805_2012Metric | R39 |
| 1 | 51k | Resistor_SMD:R_0805_2012Metric | R9 |
| 1 | 560 | Resistor_SMD:R_0805_2012Metric | R38 |
| 1 | 5k | Resistor_SMD:R_0805_2012Metric | R14 |
| 1 | 5k | Potentiometer_SMD:Potentiometer_Bourns_3224W_Vertical | RV3 |
| 1 | 6.8k | Resistor_SMD:R_0805_2012Metric | R32 |
| 1 | 620p | Capacitor_SMD:C_0805_2012Metric | C15 |
| 1 | 8MHz | Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm | Y1 |
| 1 | ANA_REF | TestPoint:TestPoint_Pad_2.0x2.0mm | TP9 |
| 1 | AUDIO | TestPoint:TestPoint_Pad_2.0x2.0mm | TP7 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_Switronic_ST-005-G_horizontal | J2 |
| 1 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1 |
| 1 | GND | TestPoint:TestPoint_Pad_2.0x2.0mm | TP8 |
| 1 | GND | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP12 |
| 1 | LM13700 | Package_SO:SOIC-16_4.55x10.3mm_P1.27mm | U6 |
| 1 | LM317_SOT-223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U8 |
| 1 | LM331N | Package_SO:SOP-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | PITCH | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP4 |
| 1 | PITCH_OUT | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1 |
| 1 | PITCH_REF | TestPoint:TestPoint_Pad_2.0x2.0mm | TP2 |
| 1 | PWR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | RED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm_NumberLabels | JP1 |
| 1 | V+ | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP11 |
| 1 | VOL | TestPoint:TestPoint_THTPad_4.0x4.0mm_Drill2.0mm | TP6 |
| 1 | VOL_CV | TestPoint:TestPoint_Pad_2.0x2.0mm | TP10 |
| 1 | VOL_OUT | TestPoint:TestPoint_Pad_2.0x2.0mm | TP5 |
| 1 | VOL_REF | TestPoint:TestPoint_Pad_2.0x2.0mm | TP3 |
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Questions
How big is the Theremin PCB?
It measures 50 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Theremin use?
115 parts, built around the OPA1679ID, LM13700M and LM331N. 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 Theremin KiCad files?
From the harrydshill/LittleTheremin repository on GitHub, at the commit this page was made from: the board is PCB/theremin.kicad_pcb and its schematic PCB Legacy/mixer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Theremin design in my own project?
Its repository states no licence, so its author keeps all rights: ask harrydshill before reusing the design.