2 layers80 × 80 mm
Digital tone
barrybridges68/assorted_audio_projects
Assorted audio projects, most in working state
102 partsGPL-3.0
2 layers80 × 40 mm
Digital volume
barrybridges68/assorted_audio_projectsAssorted audio projects, most in working state
- Size
- 80 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 38
- Pads
- 135
- Tracks, vias
- 286, 43
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 4 Jan 2026
- Updated
- 4 Jan 2026
Overview
Digital volume is an open-source printed circuit board by barrybridges68, from the barrybridges68/assorted_audio_projects repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 80 × 40 mm with 50 parts on 38 nets, routed with 286 tracks and 43 vias.
It is built around the LM321 and NE5532. Its parts include 13 capacitors, 11 resistors, 8 connectors, 5 ICs and 3 diodes. It belongs with the 8051 (CH55x, STC, AT89) boards of this library.
Main components
2Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5, C6, C8, C9, C12, C13 |
| 5 | Conn_01x02_Male | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J4, J5, J6, J7, J8 |
| 5 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3, TP4, TP5 |
| 4 | 1u | Capacitor_SMD:CP_Elec_4x5.4 | C2, C4, C7, C10 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R5, R6 |
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 1M | Resistor_SMD:R_0603_1608Metric | R7, R8 |
| 2 | 2k2 | Resistor_SMD:R_0603_1608Metric | R9, R10 |
| 2 | MCP4011-xxxxSN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2, U3 |
| 1 | 100R | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 10R | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 10u | Capacitor_SMD:CP_Elec_4x5.4 | C11 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | FB1 |
| 1 | Conn_01x03_Male | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J2 |
| 1 | D_Schottky | Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | IR Sensor Input | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J1 |
| 1 | LM321 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | MUTE | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
| 1 | N76E003 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | NE5532 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | PWR | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | Rotary Encoder Input | Connector_JST:JST_EH_B5B-EH-A_1x05_P2.50mm_Vertical | J3 |
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Questions
How big is the Digital volume PCB?
It measures 80 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Digital volume use?
50 parts, built around the LM321 and NE5532. 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 Digital volume KiCad files?
From the barrybridges68/assorted_audio_projects repository on GitHub, at the commit this page was made from: the board is DigitalVolume/BasicVolumeControl/digital_volume.kicad_pcb and its schematic Actice-Tone/Actice-Tone.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Digital volume 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).