2 layers72.5 × 76.5 mm
4 layers125 × 20 mm
Marconi 2955 Step Attenuator
jfrede/ElectronicsSome more or less useful PCB Designes
- Size
- 125 × 20 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 45
- Nets
- 36
- Pads
- 193
- Tracks, vias
- 168, 127
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 May 2024
- Updated
- 25 Mar 2026
Overview
Marconi 2955 Step Attenuator 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 4-layer board of 125 × 20 mm with 45 parts on 36 nets, routed with 168 tracks and 127 vias.
Its parts include 27 capacitors, 5 resistors, 5 ICs and 3 connectors.
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100nF | Capacitor_SMD:C_0603_1608Metric | C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21 |
| 11 | 10nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C22, C23, C24, C25, C26 |
| 5 | 330 | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5 |
| 5 | ~ | Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.9x1.9mm | U1, U2, U3, U4, U5 |
| 2 | Conn_SMA | Connector_Coaxial:SMA_Wurth_60312002114503_Vertical | J1, J2 |
| 1 | 10uf | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C27 |
| 1 | PM3 | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J3 |
The 40 most common of 45 parts.
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Questions
How big is the Marconi 2955 Step Attenuator PCB?
It measures 125 × 20 mm and has 4 copper layers, 1.58 mm thick.
What parts does the Marconi 2955 Step Attenuator use?
45 parts. 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 Marconi 2955 Step Attenuator KiCad files?
From the jfrede/Electronics repository on GitHub, at the commit this page was made from: the board is Marconi_2955_Step_Attenuator/Marconi_2955_Step_Attenuator.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 Marconi 2955 Step Attenuator 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).