4 layers90 × 40 mm
2 layers42 × 70 mm
Working on a standalone POE to USB PSU...
- Size
- 42 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 31
- Pads
- 78
- Tracks, vias
- 92, 13
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 19 Jan 2024
- Updated
- 9 Mar 2024
Overview
POE is an open-source printed circuit board by cdntinker, from the cdntinker/In-Wall-POE repository on GitHub. It is a 2-layer board of 42 × 70 mm with 23 parts on 31 nets, routed with 92 tracks and 13 vias.
It is built around the MB4S, AG9905LP and RC01374, with the SET2401ST, SMAJ58A and FNR3015S1R0MT among its other parts. Its parts include 4 diodes, 3 capacitors, 3 resistors, 2 connectors and 1 inductor.
Main components
6
MB4S
MBS-55℃~+150℃@(Tj) 1.1V@1A 35A 400V 5uA@400V 800mA Single-Phase Rectifier MBS Bridge Rectifiers ROHSYONGYUTAIBridge Rectifiers
AG9905LP
-- Lack of specifications ROHSSilver TelecomUncategorised
RC01374
弯插-40℃~+70℃ 1 Gold Non-LED Non-PoE Phosphor bronze RJ45 Jack Right Angle Unshielded 弯插 Ethernet Connectors / Modular Connectors (RJ45 RJ11) ROHSRCHEthernet Connectors / Modular Connectors (RJ45 RJ11)
SET2401ST
SMD-24P-40℃~+85℃ 1.5kV 10/100 Base-T 1CT:1CT 350uH SMD-24P Pulse Transformers(LAN) ROHSSunltech TechPulse Transformers(LAN)
SMAJ58A
DO-214AC(SMA)-55℃~+150℃ 1uA 4.3A@10/1000us 400W@10/1000us 58V 71.2V 93.6V IEC 61000-4-2 TVS Unidirectional DO-214AC(SMA) ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)
FNR3015S1R0MT
SMD,3x3mm1uH 2.5A 2.8A 39mΩ Magnetic Shielded Inductor ±20% SMD,3x3mm Power Inductors ROHScjiangPower Inductors
README
README.mdDesigned to fit inside of Wiremold surface mount boxes.
Inspired by the EAP235-wall wireless access point which has pass-through PoE. I have a little receiver for my weather station that connects to the network via WiFi & is powered by a USB charger.
Center hole, initially, exists to make room for the Ethernet cable feeding the EAP235. Of course, it can also allow for the cables to feed into the wall.
J1 supplies 5V output at up to 7W and can have a USB-A pigtail connected to feed devices outside the box.
The outline on layer User1 is the internals of a typical Wiremold surface box.
[!NOTE] The outline on layer User2 in the board view is a fairly accurate representation of an Ethernet plug in position in the jack.
The outline on layer User3 is a fairly accurate representation of an Ethernet plug in the back of the EAP235.
[!TIP] Actual board should fit in ANY North American box.
[!TIP] The PoE module in use is available in 3v3, 5v0 and 12v versions. So, this board could also be used to supply those voltages.
[!NOTE] See notations in the schematic and refer to the datasheet for information about resistors R1-R3.
2024/01/22: upgraded from the overkill Ethernet jack to a better fit plus magnetics...
2024/02/13: Assembled first board
- No smoke, but not producing output properly...
- So far, suspect it needs more of a load. Will test once I find a USB-A pigtail.
- Need to change footprint of L1 to something easier to hand-solder & move C1 a little to the left to make assembly easier.
2024/02/15: Tested successfully
- Definitely needs minimum load.
- Added 2x 470 ohm resistors in parallel at R3 (Now Rl1 & Rl2)
Does not seem to reliably keep voltage under much load.Possibly because of knock-off module? Must get Silvertel modules & test...
- Modified L1 footprint, moved C1 & added an extra load resistor footprint. All to ease assembly.
2024/02/22: Tested with actual Silvertel module AND no longer trust Chinese USB testers
- Received Silvertel module from Mouser & assembled another board.
- EXACTLY the same results.
- THEN, Just for giggles, actually measured the output with my regular meter (Uni-T UT61e)
- Well... That's interesting. UT61e says the output is a nice stable 5V (give or take ~0.03V)
- Yet the load tester AND an inline USB tester both show severe voltage drop as current goes up.
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | ? | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R4 |
| 2 | 10uf | Capacitor_SMD:C_0805_2012Metric | C2, C3 |
| 2 | MB4S | Package_TO_SOT_SMD:TO-269AA | D1, D2 |
| 2 | Rmin | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | Rl1, Rl2 |
| 1 | 100uf | Capacitor_SMD:CP_Elec_6.3x5.4 | C1 |
| 1 | Ag9905LP | Tinker:Ag9912LP | MOD-1 |
| 1 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J2 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D4 |
| 1 | LOGO | Tinker:NerdMage | G*** |
| 1 | RC01374 | tightstuff:RC01374 | J1 |
| 1 | SET2401ST | tightstuff:Eth_Magnetics (1.0) | TR3 |
| 1 | SMAJ58A | Diode_SMD:D_SMA | D3 |
| 1 | fnr3015s1r | tightstuff:fnr3015s | L1 |
The 18 most common of 23 parts.
Questions
How big is the POE PCB?
It measures 42 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the POE use?
23 parts, built around the MB4S, AG9905LP, RC01374 and SET2401ST. 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 POE KiCad files?
From the cdntinker/In-Wall-POE repository on GitHub, at the commit this page was made from: the board is POE.kicad_pcb and its schematic POE.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the POE design in my own project?
Its repository states no licence, so its author keeps all rights: ask cdntinker before reusing the design.
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