Digital synth
About the Digital synth PCB
Digital synth is an open source AVR/Arduino PCB design by giacomogramaglia, published on GitHub. It is a 2-layer board measuring 165 × 90.1 mm, with 135 components from 70 distinct parts.
Its main chip is the ATMEGA328PB-AU, from the AVR/Arduino family. Other key parts include the EP2C5T144C8N, FT232RL, AMS1117-5.0, B1212S and NE5532. By type, the board carries 40 capacitors, 32 resistors, 19 connectors, 18 ICs, 8 diodes and 6 switches.
It belongs with the audio designs in this gallery.
From the project
FPGA-based digital audio synthesizer board
Contains - Schematics - FPGA RTL files / Quartus II project - KiCad project - PCB production files
Main components on the Digital synth
Digital synth bill of materials (BOM)
135 components, 70 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | EP2C5T144C8N | QFP50P2200X2200X160-144N | U1 |
| 1 | ATMEGA328PB-AU ATmega328PB-AU | TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | FT232RL | SSOP-28_5.3x10.2mm_P0.65mm | U3 |
| 1 | AMS1117-5.0 | SOT-223-3_TabPin2 | U4 |
| 2 | B1212S | Converter_DCDC_muRata_CRE1xxxxxxSC_THT | U5, U6 |
| 2 | NE5532 | SOIC-8_3.9x4.9mm_P1.27mm | U7, U8 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U9 |
| 1 | AMS1117-1.2 | SOT-223-3_TabPin2 | U10 |
| 2 | ADS1115IDGS | TSSOP-10_3x3mm_P0.5mm | U11, U12 |
| 1 | EPCQ4ASI8N | SOIC-8_3.9x4.9mm_P1.27mm | U13 |
| 1 | W25Q64 | SOIC-8_5.23x5.23mm_P1.27mm | U14 |
| 2 | DAC121S101 | SOT-23-6 | U15, U16 |
| 1 | 6N137 | SOP-8_6.62x9.15mm_P2.54mm | U17 |
| 1 | DM-OLED096-636 | MODULE_DM-OLED096-636 | U18 |
| 1 | SG5032 | Crystal_SMD_5032-4Pin_5.0x3.2mm | X1 |
| 1 | 16MHz xtal | Crystal_HC18-U_Vertical | Y1 |
| 1 | Barrel Jack | BarrelJack_Horizontal | J1 |
| 1 | AUDIO_OUT_A | PJ-307 | J2 |
| 1 | AUDIO_OUT_B | PJ-307 | J3 |
| 1 | P1 | PinHeader_2x14_P2.54mm_Vertical | J4 |
Show 50 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | JTAG | IDC-Header_2x06_P2.54mm_Vertical | J5 |
| 1 | P2 | PinHeader_2x14_P2.54mm_Vertical | J6 |
| 1 | AS | IDC-Header_2x06_P2.54mm_Vertical | J7 |
| 1 | P3 | PinHeader_2x14_P2.54mm_Vertical | J8 |
| 1 | P4 | PinHeader_2x14_P2.54mm_Vertical | J9 |
| 1 | DIN-5_CONNECTOR DIN-5_Connector | DIN-504-M10 | J10 |
| 1 | ATMEGA_A6_A7 | PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | ATMEGA_A0:3 | PinHeader_1x04_P2.54mm_Vertical | J12 |
| 1 | ATMEGA_I2C_TP | PinHeader_1x02_P2.54mm_Vertical | J13 |
| 1 | ICSP | PinHeader_2x03_P2.54mm_Vertical | J14 |
| 1 | ATMEGA_D0:7 | PinHeader_1x08_P2.54mm_Vertical | J15 |
| 1 | USB_B_Micro | USB_Micro-B_Amphenol_10103594-0001LF_Horizontal | J16 |
| 1 | DAC_OUT_A | PinHeader_1x02_P2.54mm_Vertical | J17 |
| 1 | DAC_OUT_B | PinHeader_1x02_P2.54mm_Vertical | J18 |
| 1 | PWR_conn | PinHeader_2x06_P2.54mm_Vertical | J19 |
| 1 | R_ATT_1 | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1 |
| 1 | R_ATT_2 | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV2 |
| 1 | POT_A | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV3 |
| 1 | POT_D | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV4 |
| 1 | POT_S | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV5 |
| 1 | POT_R | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV6 |
| 1 | POT_SH | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV7 |
| 1 | POT_LVL | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV8 |
| 2 | R_POT | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV9, RV10 |
| 1 | SW_PWR | MTS-103 | SW1 |
| 1 | FPGA_reset | SW_Push_1P1T_NO_6x6mm_H9.5mm | SW2 |
| 1 | FPGA_MODE | MTS-103 | SW3 |
| 1 | FPGA_STORE | SW_Push_1P1T_NO_6x6mm_H9.5mm | SW4 |
| 1 | ATMEGA_reset | SW_Push_1P1T_NO_6x6mm_H9.5mm | SW5 |
| 1 | ATMEGA_in_sw | SW_Push_1P1T_NO_6x6mm_H9.5mm | SW6 |
| 2 | MDD-M7 | D_SMA | D1, D4 |
| 1 | LED | LED_0805_2012Metric | D2 |
| 1 | MODE_LED | LED_0805_2012Metric | D3 |
| 1 | MIDI_LED | LED_0805_2012Metric | D5 |
| 1 | CBUS0_LED | LED_0805_2012Metric | D6 |
| 1 | CBUS1_LED | LED_0805_2012Metric | D7 |
| 1 | OUT_LED | LED_0805_2012Metric | D8 |
| 13 | 2.2U 2.2u | C_0805_2012Metric | C1, C2, C5, C6, C27, C28, C29, C30 +5 |
| 1 | 470N 470n | C_0603_1608Metric | C3 |
| 14 | 100N 100n | C_0402_1005Metric | C4, C10, C12, C16, C17, C18, C19, C20 +6 |
| 2 | 4.7U 4.7u | C_0805_2012Metric | C7, C8 |
| 3 | 22U 22u | C_0805_2012Metric | C9, C11, C15 |
| 2 | 470P 470p | C_0805_2012Metric | C13, C14 |
| 1 | 10U 10u | C_1206_3216Metric | C21 |
| 2 | 10U 10u | CP_EIA-3216-18_Kemet-A | C23, C25 |
| 2 | 15P 15p | C_0603_1608Metric | C39, C40 |
| 18 | 10K 10k | R_0402_1005Metric | R1, R3, R4, R5, R6, R7, R8, R9 +10 |
| 1 | 1k | R_1206_3216Metric | R2 |
| 7 | 1k | R_0603_1608Metric | R12, R14, R15, R26, R29, R30, R31 |
| 6 | 220 | R_0805_2012Metric | R19, R24, R25, R27, R28, R32 |
Digital synth design files
The KiCad project lives in the giacomogramaglia/digital_synth repository on GitHub; these links point at the commit this page was built from.
Digital synth: common questions
What microcontroller does the Digital synth use?
The Digital synth is built around the ATMEGA328PB-AU, from the AVR/Arduino family.
How big is the Digital synth PCB?
The Digital synth measures 165 × 90.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Digital synth?
135 components, from 70 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Digital synth design files?
From the giacomogramaglia/digital_synth repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Digital synth design in my own project?
The repository has no license, so all rights stay with giacomogramaglia. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Digital synth without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
Similar boards
AVR/ArduinoRedox keyboard
mattdibi
162.2 × 126.5 mm77 parts2LMIT2.0k
AVR/ArduinoModuleV450
stuartpittaway
30 × 61.4 mm39 parts2LCC-BY-NC-4.01.1k
AVR/ArduinoV4
30 × 50 mm38 parts2LCC-BY-NC-4.01.1k
AVR/ArduinoDiscipline
coseyfannitutti
304.9 × 122.8 mm170 parts2LCC-BY-NC-4.01.0k
AVR/ArduinoMegadesk
gcormier
41.7 × 32.2 mm23 parts2LGPL-3.0818
AVR/ArduinoEasyduino Atmega Nano
Hanqaqa
43.4 × 18 mm30 parts4LCERN-OHL-P-2.0746