4 layers125 × 20 mm
2 layers77.5 × 45.7 mm
Unibias
jfrede/ElectronicsSome more or less useful PCB Designes
- Size
- 77.5 × 45.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 40
- Pads
- 86
- Tracks, vias
- 72, 19
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 May 2024
- Updated
- 25 Mar 2026
Overview
Unibias is an open-source printed circuit board by jfrede, from the jfrede/Electronics repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 77.5 × 45.7 mm with 24 parts on 40 nets, routed with 72 tracks and 19 vias.
It is built around the MA4P506-4. Its parts include 7 resistors, 4 inductors, 3 capacitors, 3 switches and 2 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 47u | Inductor_SMD:L_0805_2012Metric | L1, L2, L3, L4 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric | R5, R6, R7 |
| 3 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2, SW3 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 470 | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | BNC | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J1, J2 |
| 1 | 100uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C3 |
| 1 | 1SV307 | Diode_SMD:D_SOD-323 | D1 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | MA4P506 | Diode_SMD:D_MELF | D2 |
| 1 | SSD1306 | SSD1306:128x64OLED | Brd1 |
The 23 most common of 24 parts.
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Questions
How big is the Unibias PCB?
It measures 77.5 × 45.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Unibias use?
24 parts, built around the MA4P506-4. 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 Unibias KiCad files?
From the jfrede/Electronics repository on GitHub, at the commit this page was made from: the board is Unibias/Unibias.kicad_pcb and its schematic 200w-Filter/200w-Filter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Unibias design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).