2 layers184.2 × 81 mm
X B350W-4-LITE-350W CLASS B POWER AMP MAIN CIRCUIT
X-ANONYMOUS-POWER-AMPLIFIER/X-B350W-4-LITE
SIMPLIFIED MAIN-CIRCUIT MODULE OF 350 WATTS CLASS-B AUDIO POWER AMPLIFIER MAIN-CIRCUIT FOR 4-OHMS OUTPUT LOAD
108 parts
2 layers107.1 × 101.7 mm
The Leach Amp
TiebeDeclercq/Leach-AmpThis is a complete pcb and schematic of the Leach Amp based on: https://leachlegacy.ece.gatech.edu/lowtim/
- Size
- 107.1 × 101.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 122
- Nets
- 62
- Pads
- 254
- Tracks, vias
- 634, 1
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Jan 2026
- Updated
- 24 Jan 2026
Overview
The Leach Amp is an open-source printed circuit board by TiebeDeclercq, from the TiebeDeclercq/Leach-Amp repository on GitHub, published under the MIT licence. It is a 2-layer board of 107.1 × 101.7 mm with 122 parts on 62 nets, routed with 634 tracks and 1 via.
It is built around the MPSA06, MPSA56 and 1N5250B, with the MJE15034G, MJE15035G and MJE15030G-JSM among its other parts. Its parts include 50 resistors, 25 capacitors, 21 transistors, 12 diodes and 8 connectors. It belongs with the audio and music boards of this library.
Main components
7
MPSA06
TO-92-55℃~+150℃ 1 NPN 100 100MHz 100nA 250mV 4V 500mA 625mW 80V NPN TO-92 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)MPSA56
TO-92-55℃~+150℃ 1 PNP 100 100nA 250mV 4V 500mA 50MHz 625mW 80V PNP TO-92 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
1N5250B
插件,D1.53xL3.05mm-65℃~+200℃ 1 Independent 100nA@15V 19V~21V 20V 25Ω 500mW 600Ω 插件,D1.53xL3.05mm Zener Diodes ROHSonsemiZener DiodesMJE15034G
TO-220C1 NPN 100 10uA 30MHz 350V 500mV 50W 5V 8A NPN TO-220C Bipolar (BJT) ROHSSPTECHBipolar (BJT)
MJE15035G
TO-220C1 PNP 100 10uA 20MHz 350V 500mV 50W 5V 8A PNP TO-220C Bipolar (BJT) ROHSSPTECHBipolar (BJT)
MJE15030G-JSM
TO-220-3TO-220-3 Bipolar (BJT) ROHSJSMSEMIBipolar (BJT)MJE15031G-JSM
TO-220-3TO-220-3 Bipolar (BJT) ROHSJSMSEMIBipolar (BJT)
README
README.mdThe Leach Amp
This is a complete pcb and schematic of the Leach Amp based on: https://leachlegacy.ece.gatech.edu/lowtim/
Het schematic is:
Parts
122| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 300Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R5, R6, R7, R8, R9, R10 |
| 8 | ~ | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | J1, J2, J3, J4, J5, J6, J7, J8 |
| 6 | 0.1uF 100V | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C2, C3, C15, C16, C23, C24 |
| 6 | 100uF 63V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C4, C5, C13, C14, C21, C22 |
| 6 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D5, D6, D7, D8, D9, D10 |
| 6 | MPSA06 | DectronicsFootprints:TO-92L_HandSolder_NPN | Q1, Q2, Q5, Q7, Q9, Q10 |
| 5 | MPSA56 | DectronicsFootprints:TO-92L_HandSolder_NPN | Q3, Q4, Q6, Q8, Q11 |
| 4 | 0.1uF 50V | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C7, C12, C17, C18 |
| 4 | 0.33Ω 5W | Resistor_THT:R_Axial_DIN0918_L18.0mm_D9.0mm_P22.86mm_Horizontal | R45, R46, R47, R48 |
| 4 | 10Ω 1/2W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R41, R42, R43, R44 |
| 4 | 1N5250B | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D13, D14, D15, D16 |
| 4 | 680Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R37, R38, R39, R40 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 1.2kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R12, R27 |
| 3 | 82Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R32, R33, R51 |
| 2 | 0.01uF 50V | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C19, C20 |
| 2 | 10pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C10, C11 |
| 2 | 11kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17, R18 |
| 2 | 12kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R16 |
| 2 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D11, D12 |
| 2 | 1kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R25, R26 |
| 2 | 2.2kΩ 1/2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R13, R14 |
| 2 | 270Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R28, R29 |
| 2 | 3.9kΩ 1/2W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R30, R31 |
| 2 | 30Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R21, R22 |
| 2 | 330 uF, 16 V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C6A1, C6B1 |
| 2 | 330Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R34, R35 |
| 2 | 360Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23, R24 |
| 2 | MJE15034G | DectronicsFootprints:TO-220-3_Vertical_B | Q13, Q14 |
| 2 | MJE15035G | DectronicsFootprints:TO-220-3_Vertical_B | Q12, Q15 |
| 2 | NJL1302DG | Package_TO_SOT_THT:TO-3P-3_Vertical | Q19, Q21 |
| 2 | NJL3281DG | Package_TO_SOT_THT:TO-3P-3_Vertical | Q18, Q20 |
| 1 | 1.1kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R19 |
| 1 | 10Ω 2W | Resistor_THT:R_Axial_DIN0922_L20.0mm_D9.0mm_P25.40mm_Horizontal | R49 |
| 1 | 180pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8 |
| 1 | 20kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 220Ω 1/2W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R36 |
| 1 | 22kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20 |
| 1 | 2kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 390 pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1 |
| 1 | 47pF | Capacitor_THT:C_Disc_D12.5mm_W5.0mm_P7.50mm | C9 |
| 1 | LOGO | Drawings_Customs:Dectronics_Sub_20mm | G*** |
| 1 | MJE15030G | DectronicsFootprints:TO-220-MJE15030 | Q16 |
| 1 | MJE15031G | DectronicsFootprints:TO-220-MJE15030 | Q17 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
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Questions
How big is the The Leach Amp PCB?
It measures 107.1 × 101.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the The Leach Amp use?
122 parts, built around the MPSA06, MPSA56, 1N5250B and MJE15034G. 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 The Leach Amp KiCad files?
From the TiebeDeclercq/Leach-Amp repository on GitHub, at the commit this page was made from: the board is The Leach Amp PCB/The Leach Amp.kicad_pcb and its schematic The Leach Amp PCB/The Leach Amp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the The Leach Amp design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).