2 layers149.9 × 60 mm
2 layers90 × 45 mm
MEC PSU-1-12
longmagnolia/N149A-Reverse-EngineerA reverse engineer of Neumann type N194A and N194V power supplys
- Size
- 90 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 5
- Pads
- 24
- Tracks, vias
- 73, 0
- Pours
- 29
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Apr 2025
- Updated
- 1 Apr 2026
Overview
MEC PSU-1-12 is an open-source printed circuit board by longmagnolia, from the longmagnolia/N149A-Reverse-Engineer repository on GitHub. It is a 2-layer board of 90 × 45 mm with 15 parts on 5 nets, routed with 73 tracks and 0 vias.
It is built around the KBP04G. Its parts include 2 capacitors, 2 diodes and 1 IC. It belongs with the power boards of this library.
Main components
1README
README.mdNeumann N149A/V Tube Power Supply Reverse Engineering
This project aims to reverse engineer and document the design of Neumann type N194A and N194V power supplys. Furthermore, this project is primarily concerned the deisgn of the PCB found inside as well as offering a replacement linear design for the discrete SMPS inside of each stock unit.
Operation
These power supplys offer a small variety of voltage rails to be used with a connected Neumann M147, M149, or M150 type tube large diaphragm condensor microphone.
The power supplys operate largely with main two blocks. First, being the discrete switch mode power supply often found to be a Globtek "TR9KE1250LCP-Y" or similar. These are typically a 12V 1.25A 15W black brick type SMPS used to step the incoming 120VAC from the wall down to 12VDC to be used by other circuitry. Second, the remainder of the power supply is comprised by a PCB manufactured likely by Neumann that takes the 12VDC from the SMPS and makes the necessary rails for the microphone. On this board the DIN-8 connector for linking to the microphone and XLR-3 connector for output are found.
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | Conn_01x01_Socket | Connector_Wire:SolderWire-2.5sqmm_1x01_D2.4mm_OD4.4mm | 1, 2, 3, 4, Out |
| 1 | 1N4004 | Diode_THT:D_5W_P10.16mm_Horizontal | D2 |
| 1 | 2200µF 50V | Capacitor_THT:CP_Radial_D18.0mm_P7.50mm | C1 |
| 1 | 22µF 50V | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C2 |
| 1 | Heatsink 35x13mm | Heatsink:Heatsink_Fischer_SK104-STCB_35x13mm__2xDrill3.5mm_ScrewM3 | Heatsink |
| 1 | KBP04G | Diode_THT:Diode_Bridge_Vishay_KBPM | D1 |
| 1 | LM7812_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | IC1 |
The 11 most common of 15 parts.
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Questions
How big is the MEC PSU-1-12 PCB?
It measures 90 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MEC PSU-1-12 use?
15 parts, built around the KBP04G. 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 MEC PSU-1-12 KiCad files?
From the longmagnolia/N149A-Reverse-Engineer repository on GitHub, at the commit this page was made from: the board is MEC-PSU-1-12.kicad_pcb and its schematic MEC-PSU-1-12.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MEC PSU-1-12 design in my own project?
Its repository states no licence, so its author keeps all rights: ask longmagnolia before reusing the design.