2 layers56 × 102.5 mm
2 layers228 × 100 mm
AMP MA
pivikd/AMP-MA1AMP-AM (standing for Modus Aequale, signifying a rhythmic, ideal tone and modular structure) is an open-source, transistor-based guitar combo amplifier project.
- Size
- 228 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 148
- Nets
- 74
- Pads
- 349
- Tracks, vias
- 363, 392
- Pours
- 405
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 23 Apr 2026
- Updated
- 6 Nov 2026
Overview
AMP MA is an open-source printed circuit board by pivikd, from the pivikd/AMP-MA repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 228 × 100 mm with 148 parts on 74 nets, routed with 363 tracks and 392 vias.
It is built around the CA3080A, TL072 and LM1875T, with the LM317, 2SK30A-Y and 2SC1815 among its other parts. Its parts include 48 resistors, 35 capacitors, 13 diodes, 10 transistors and 4 ICs. It belongs with the audio and music boards of this library.
Main components
6CA3080A
TO-99-8Programmable gain mode Transconductance Amplifier TO-99-8 Special Purpose AmplifiersRochester Electronics, LLCSpecial Purpose Amplifiers
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
LM1875T
TO-220B-50.015% 16V~60V 70mA 83dB、95dB TO-220B-5 Audio Amplifiers ROHSHGSEMIAudio Amplifiers
LM317
SOT-223-40℃~+85℃@(Ta) 0.003%Vout 1 1.3V~37V 1A 40V 80dB@(120Hz) Adjustable Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSJSMSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
2SK30A-Y
TO-92TO-92 JFETs ROHSQNHJFETs
2SC1815
SOT-23-55℃~+150℃ 1 NPN 100nA 130 150mA 200mW 250mV 50V 5V 80MHz NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
README.md
Project Status
AMP-AM is currently in the early development phase and is considered unstable. The first stable release is scheduled for Q4 2026
The project is currently in the pre-alpha stage – creating the first prototype
AMP-AM (AMP Modus Aequale)
AMP-AM (standing for Modus Aequale, signifying a rhythmic, ideal tone and modular structure) is an open-source, transistor-based guitar combo amplifier project. It is designed to bridge the gap between solid-state reliability and the organic, harmonic richness of vacuum tube sound.
The project focuses on a modular architecture, originally developed as a high-fidelity upgrade for the Epiphone 15C PCB. By utilizing independent blocks, AMP-AM allows for seamless customization and easier adaptation to various amp enclosures.
This project is designed and maintained by: Danylo Pyvovarov.
Key Features
-
Tube-like Architecture: Uses Mu-amp based cascades with 2SK30A transistors to achieve a warm, organic sound and harmonic saturation that mimics vacuum tube behavior.
-
Dual Input Support: Designed to handle two guitars simultaneously.
-
Legendary Tone Stacks: Features a 3-band EQ based on the classic tone stacks(Integrated Tone Stacks).
-
Integrated Compression: Built-in compressor block based on the vintage Ibanez CP835 circuitry.
Signal Chain
- Input buffer
- Preamp (Mu-AMP)
- Compressor (Ibanez CP835)
- Tone Stack
- Recovery Stage
- Power Amp (LM1875)
Integrated Tone Stacks
-
Fender Treble-Middle-Bass
-
Marshall (JCM900 2100 SL-X)
-
Dumble Rock
Own:
-
TS0 (based on Marshall JCM900 2100 SL-x)
-
TS1 (based on Dumble Rock)
Parts
148| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R14, R18, R19, R30, R32, R37, R38, R42, R43, R63 |
| 7 | 100n | PrLib:C_disc_D7_W2.5_P5 | C1, C2, C41, C44, C45, C61, C62 |
| 6 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D5, D6, D7, D8, D9, D10 |
| 6 | 2SK30A | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2, Q3, Q4, Q10, Q11 |
| 5 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | CE3, CE4, CE7, CE61, CE62 |
| 5 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R33, R35, R36 |
| 4 | 10n | PrLib:C_Disc_D4.3_W1.9_P5.00 | C33, C34, C42, C43 |
| 4 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 4 | 2SC1815 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q5, Q6, Q7, Q8 |
| 3 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R16, R61 |
| 3 | 1K5 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R0, R23, R24 |
| 3 | 1u | PrLib:C_disc_D7_W2.5_P5 | C8, C20, C21 |
| 3 | 510K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R41, R44, R45 |
| 2 | 0R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R17 |
| 2 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R21, R22 |
| 2 | 100KA | PrLib:potentiometer | VOL1, VOL2 |
| 2 | 10p | PrLib:C_disc_D7_W2.5_P5 | C11, C16 |
| 2 | 10u | PrLib:C_disc_D7_W2.5_P5 | C12, C17 |
| 2 | 10u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | CE5, CE6 |
| 2 | 150K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R34, R39 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D31, D32 |
| 2 | 200R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3 |
| 2 | 2200u | Capacitor_THT:CP_Radial_D16.0mm_P7.50mm | CE1, CE2 |
| 2 | 22K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R62, R64 |
| 2 | 2K2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4 |
| 2 | 2M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R15 |
| 2 | 3.3u | PrLib:C_disc_D7_W2.5_P5 | C14, C19 |
| 2 | 330n | PrLib:C_disc_D7_W2.5_P5 | C13, C18 |
| 2 | 50n | PrLib:C_disc_D7_W2.5_P5 | C10, C15 |
| 2 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP52, JP54 |
| 2 | SolderJumper_3_Open | Jumper:SolderJumper-3_P2.0mm_Open_TrianglePad1.0x1.5mm_NumberLabels | JP50, JP51 |
| 2 | ~ | PrLib:Jack_3_6pin | IN1, IN2 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 100KB | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | LEVEL1 |
| 1 | 10n | PrLib:C_disc_D7_W2.5_P5 | C30 |
| 1 | 10u/16 | Capacitor_THT:CP_Radial_Tantal_D5.5mm_P2.50mm | C35 |
| 1 | 1M | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV50 |
| 1 | 2.2u | PrLib:C_disc_D7_W2.5_P5 | C63 |
| 1 | 20K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R40 |
| 1 | 220n | PrLib:C_disc_D7_W2.5_P5 | C60 |
| 1 | 22u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | CE63 |
| 1 | 250mA | Fuse:Fuseholder_Clip-5x20mm_Littelfuse_520_Inline_P20.50x5.80mm_D1.30mm_Horizontal | F1 |
| 1 | 2K | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 2R2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R60 |
| 1 | 2n2 | PrLib:C_Disc_D4.3_W1.9_P5.00 | C31 |
| 1 | 470K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R31 |
| 1 | 47u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | CE8 |
| 1 | 500KC | PrLib:potentiometer | Sustain |
| 1 | 50K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20 |
| 1 | Bass | PrLib:potentiometer | Bass |
| 1 | C51 | PrLib:C_disc_D7_W2.5_P5 | C51 |
| 1 | C52 | PrLib:C_disc_D7_W2.5_P5 | C52 |
| 1 | C53 | PrLib:C_disc_D7_W2.5_P5 | C53 |
| 1 | C54 | PrLib:C_disc_D7_W2.5_P5 | C54 |
| 1 | C55 | PrLib:C_disc_D7_W2.5_P5 | C55 |
| 1 | C56 | PrLib:C_disc_D7_W2.5_P5 | C56 |
| 1 | CA3080 | Package_DIP:DIP-8_W7.62mm | U3 |
| 1 | External Speaker | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | OUT2 |
| 1 | LED | LED_THT:LED_D3.0mm_Horizontal_O6.35mm_Z6.0mm | D0 |
| 1 | LM1875 | Connector_JST:JST_XH_B5B-XH-A_1x05_P2.50mm_Vertical | J6 |
| 1 | LM317 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U4 |
| 1 | LM337 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U5 |
| 1 | LOGO | LOGO | G*** |
| 1 | Middle | PrLib:potentiometer | Middle |
| 1 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | GND1 |
| 1 | Neutral | PrLib:connector | J1 |
| 1 | PXB N | PrLib:connector | J2 |
| 1 | PXB10C | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J5 |
| 1 | R51 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R51 |
| 1 | R52 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R52 |
| 1 | R53 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R53 |
| 1 | Rin | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R50 |
| 1 | SW_DPDT_x2 | PrLib:SW DPDT | SW1 |
| 1 | Speaker | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | OUT1 |
| 1 | TL072 | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | Treble | PrLib:potentiometer | Treble |
Questions
How big is the AMP MA PCB?
It measures 228 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AMP MA use?
148 parts, built around the CA3080A, TL072, LM1875T and LM317. 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 AMP MA KiCad files?
From the pivikd/AMP-MA repository on GitHub, at the commit this page was made from: the board is AMP-MA.kicad_pcb and its schematic AMP-MA.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AMP MA design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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