2 layers
Testlayout
mattybrad/polymod4
A polyphonic digital synthesizer which can be patched like an analog modular synth.
21 parts2GPL-3.0
2 layers138 × 115 mm
Polymod proto 1
mattybrad/polymod42A polyphonic digital synthesizer which can be patched like an analog modular synth.
- Size
- 138 × 115 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 133
- Nets
- 198
- Pads
- 580
- Tracks, vias
- 1,041, 77
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 4 Oct 2021
- Updated
- 1 Jun 2025
Overview
Polymod proto 1 is an open-source printed circuit board by mattybrad, from the mattybrad/polymod4 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 138 × 115 mm with 133 parts on 198 nets, routed with 1,041 tracks and 77 vias.
It is built around the 74HC595 and 74LS165PC. Its parts include 42 resistors, 38 diodes, 13 ICs, 13 connectors and 4 switches.
Main components
2
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
74LS165PC
DIP-160.4mA 0℃~+70℃ 105mW 35MHz 4.75V~5.25V 47ns@5V,50pF 8 8mA Asynchronous parallel load function Complementary Parallel-to-Serial DIP-16 Shift RegistersTexas InstrumentsShift Registers
README
README.mdPolyMod 4
A polyphonic digital synthesizer which can be patched like an analog modular synth.
Current setup is C++ code running on an Electrosmith Daisy board (with built-in DAC), on a PCB which includes potentiometers, buttons, LEDs, and circuitry to detect connections between output and input sockets.
Parts
133| Qty | Value | Footprint | References |
|---|---|---|---|
| 32 | 10K | polymodcustom:R_0805_2012Metric | R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26 +16 |
| 32 | 1N4148 | polymodcustom:Nexperia_CFP3_SOD-123W | D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 +16 |
| 16 | R_Potentiometer | polymodcustom:Potentiometer_Alps_RK09K_Single_Vertical | RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8, RV9, RV10, RV11, RV12, RV13, RV14, RV15, RV16 |
| 8 | Conn_01x08_Male | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J6, J7, J8, J9, J10, J11, J12, J13 |
| 5 | 680R | polymodcustom:R_0805_2012Metric | R6, R7, R8, R9, R10 |
| 5 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2, U5, U8, U9, U10 |
| 5 | 74LS165 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3, U6, U11, U12, U13 |
| 5 | LED | LED_THT:LED_D5.0mm | D2, D3, D4, D5, D6 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | SW_Push | polymodcustom:SW_PUSH-12mm | SW1, SW2, SW3, SW4 |
| 3 | 220 | polymodcustom:R_0805_2012Metric | R1, R4, R5 |
| 2 | 4051 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U4, U7 |
| 2 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J3 |
| 2 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2, J14 |
| 1 | 10k | polymodcustom:R_0805_2012Metric | R2 |
| 1 | 1N4148 | Diode_SMD:D_SOD-123 | D1 |
| 1 | 470 | polymodcustom:R_0805_2012Metric | R3 |
| 1 | 470uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1 |
| 1 | 6N138 | Package_DIP:DIP-8_W7.62mm_Socket | U1 |
| 1 | Barrel_Jack | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Device_Audio_Electrosmith_Daisy_Seed_Rev4 | Device_Audio_Electrosmith_Daisy_Seed:Device_Audio_Electrosmith_Daisy_Seed | A1 |
| 1 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
More from mattybrad/polymod4
1Similar boards
- 2 layers
Panel old
dankar/altair8800
What started as a Intel 8080 emulator turned into a Altair 8800 emulator with associated hardware for a front panel.
103 parts31MIT - 2 layers85.1 × 31.8 mm
Esp01Expander
ruenahcmohr/esp_01Expand32
esp-01 (esp8266) IO expander, 16 output, 16 input = 32
20 parts15 - 2 layers150 × 150 mm
- 2 layers99.6 × 57.9 mm
- 4 layers64 × 93.5 mm
- 2 layers193.5 × 80 mm
- 2 layers128.7 × 81 mm
- 2 layers128.3 × 50.8 mm
CD32 Controller
BleuLlama/AmigaSchematics
Schematics of various Commodore Amiga related items
33 parts58MIT
Questions
How big is the Polymod proto 1 PCB?
It measures 138 × 115 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Polymod proto 1 use?
133 parts, built around the 74HC595 and 74LS165PC. 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 Polymod proto 1 KiCad files?
From the mattybrad/polymod4 repository on GitHub, at the commit this page was made from: the board is schematics/polymod_proto_1/polymod_proto_1/polymod_proto_1.kicad_pcb and its schematic schematics/patchbay8in8out/patchbay8in8out.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Polymod proto 1 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).