2 layers
2 layers211.2 × 87.8 mm
Original
Ajay-Mallesh/PCB-DesignsCollection of PCB designs -> Basic circuits
- Size
- 211.2 × 87.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 71
- Nets
- 43
- Pads
- 166
- Tracks, vias
- 484, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 14 Nov 2025
- Updated
- 14 Nov 2025
Overview
Original is an open-source printed circuit board by Ajay-Mallesh, from the Ajay-Mallesh/PCB-Designs repository on GitHub. It is a 2-layer board of 211.2 × 87.8 mm with 71 parts on 43 nets, routed with 484 tracks and 0 vias.
It is built around the BD139, BD140 and TIP41, with the TIP42 among its other parts. Its parts include 24 resistors, 16 capacitors, 8 transistors, 8 connectors and 4 diodes.
Main components
4
BD139
TO-126-65℃~+150℃ 1 NPN 1.5A 10uA 12.5W 500mV 5V 63 80V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD140
TO-126-65℃~+150℃ 1 PNP 1.25W 1.5A 100nA 500mV 5V 63 80V PNP TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
TIP41
TO-220TO-220 Bipolar (BJT) ROHSTFBipolar Transistors - BJTTIP42
TO-220-32W 30 3MHz 40V 6A 700uA PNP TO-220-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)
README
Readme.mdPCB-Designs
** ALL PROJECTS ARE DESIGNED WITH KICAD ** : 𝕂𝕚𝕔𝕒𝕕
KICAD SOFTWARE LINK :
** WINDOWS ** : https://www.kicad.org/download/windows/
** MAC OS ** : https://www.kicad.org/download/macos/
** LINUX ** : https://www.kicad.org/download/linux/
𝕯𝖊𝖘𝖎𝖌𝖓𝖊𝖉 𝖇𝖞 ✍ ✌𝓐𝓳𝓪𝔂𝓜𝓪𝓵𝓵𝓮𝓼𝓱✌
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Parts
71| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 1N47xxA | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 4 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3, R12, R15, R24 |
| 4 | 220k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R7, R8, R19, R20 |
| 4 | 470u | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C3, C4, C11, C12 |
| 4 | 5.1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R13, R14 |
| 4 | 510p | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2, C9, C10 |
| 4 | 51p | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C5, C6, C13, C14 |
| 4 | 620 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R5, R6, R17, R18 |
| 4 | 680 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R9, R10, R21, R22 |
| 2 | 100n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C7, C15 |
| 2 | 1r 1w | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R11, R23 |
| 2 | 200k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4, R16 |
| 2 | 220n | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C8, C16 |
| 2 | BD139 | TO_SOT_Packages_THT:TO-126_Horizontal | Q1, Q5 |
| 2 | BD140 | TO_SOT_Packages_THT:TO-126_Horizontal | Q2, Q6 |
| 2 | L G R | TerminalBlock:TerminalBlock_bornier-3_P5.08mm | J1, J5 |
| 2 | LOGO | LOGI:LOGO PT | G***, G*** |
| 2 | R_POT | Potentiometer_THT:Potentiometer_Piher_PC-16_Single_Vertical | RV1, RV2 |
| 2 | Screw_Terminal_01x03 | TerminalBlock:TerminalBlock_bornier-3_P5.08mm | J4, J8 |
| 2 | TIP41 | TO_SOT_Packages_THT:TO-220-3_Horizontal | Q4, Q8 |
| 2 | TIP42 | TO_SOT_Packages_THT:TO-220-3_Horizontal | Q3, Q7 |
| 2 | TL071 | Package_DIP:DIP-8_W7.62mm | U1, U2 |
| 2 | jumper | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Horizontal | J3, J6 |
| 2 | speaker | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J2, J7 |
| 1 | LOGO | LOGI:LOGO1 | G*** |
The 67 most common of 71 parts.
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Questions
How big is the Original PCB?
It measures 211.2 × 87.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Original use?
71 parts, built around the BD139, BD140, TIP41 and TIP42. 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 Original KiCad files?
From the Ajay-Mallesh/PCB-Designs repository on GitHub, at the commit this page was made from: the board is ampl 50w/original/original.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Original design in my own project?
Its repository states no licence, so its author keeps all rights: ask Ajay-Mallesh before reusing the design.