2 layers
Digital volume
barrybridges68/assorted_audio_projects
Assorted audio projects, most in working state
97 partsGPL-3.0
2 layers80 × 80 mm
Digital tone
barrybridges68/assorted_audio_projectsAssorted audio projects, most in working state
- Size
- 80 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 102
- Nets
- 62
- Pads
- 260
- Tracks, vias
- 529, 95
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 4 Jan 2026
- Updated
- 4 Jan 2026
Overview
Digital tone 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 × 80 mm with 102 parts on 62 nets, routed with 529 tracks and 95 vias.
It is built around the NE5532, LM321 and LM4562NA, with the L7805, BZT52C7V5 and SSM3J338R,LF among its other parts. Its parts include 45 resistors, 35 capacitors, 8 ICs, 5 connectors and 1 diode.
Main components
6
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
LM321
SOT-23-50℃~+70℃ 1 2mV 3nA 400V/ms 40mA 430uA 45nA 90dB SOT-23-5 Operational Amplifier ROHSPJSEMIOperational Amplifier
LM4562NA
PDIP-8-17V~-2.5V、2.5V~17V -40℃~+85℃ 0.00003% 10mA 120dB 2-Channel PDIP-8 Audio Amplifiers ROHSTexas InstrumentsAudio Amplifiers
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BZT52C7V5
SOD-123Zener Diodeshongjiacheng
SSM3J338R,LF
SOT-23F1 P-Channel 1.4nF 12V 15.9mΩ@4.5V 19.5nC@4.5V 1V 1W 225pF 250pF 6A P-Channel SOT-23F MOSFETs ROHSToshibaMOSFETs
Parts
102| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 22k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4, R7, R10, R11, R12, R17, R18, R19, R21, R23, R24 |
| 12 | 2k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15, R16, R20, R22, R32, R33, R34, R35, R40, R41, R42, R43 |
| 9 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C6, C7, C8, C13, C25, C26, C29, C30 |
| 6 | 10R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R36, R37, R38, R39, R44, R45 |
| 6 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C5, C23, C24, C27, C28 |
| 5 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R25, R26, R28, R29, R31 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C19, C22, C33, C35 |
| 4 | 6k8 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R6, R8, R9 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | NE5532 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U3, U4, U5 |
| 3 | 10u | Capacitor_SMD:C_1206_3216Metric | C31, C32, C34 |
| 2 | 100R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2 |
| 2 | 100u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C14, C15 |
| 2 | 100u | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 2 | 1u | Capacitor_SMD:C_0603_1608Metric | C17, C20 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C11, C12 |
| 2 | 22u | Capacitor_SMD:CP_Elec_6.3x5.2 | C18, C21 |
| 2 | 39k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R14 |
| 2 | 4n7 | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9, C10 |
| 2 | LM321 | Package_TO_SOT_SMD:SOT-23-5 | U6, U7 |
| 2 | NetTie_2 | NetTie:NetTie-2_SMD_Pad0.5mm | NT1, NT2 |
| 2 | TBD | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R27, R30 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C16 |
| 1 | Audio In | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-3_1x03_P5.00mm_Horizontal | J2 |
| 1 | Audio Out | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-3_1x03_P5.00mm_Horizontal | J5 |
| 1 | BZT52C7V5 | Diode_SMD:D_SOD-123F | D1 |
| 1 | Bass Pot Connector | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J3 |
| 1 | L7805 | Package_TO_SOT_SMD:TO-252-2 | U8 |
| 1 | LM4562 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | L_Ferrite | Resistor_SMD:R_0603_1608Metric | L1 |
| 1 | Power | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J1 |
| 1 | SSM3J338R,LF | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Treble Pot Connector | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J4 |
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Questions
How big is the Digital tone PCB?
It measures 80 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Digital tone use?
102 parts, built around the NE5532, LM321, LM4562NA and L7805. 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 tone KiCad files?
From the barrybridges68/assorted_audio_projects repository on GitHub, at the commit this page was made from: the board is digital-tone/digital-tone.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 tone 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).