HardLabs

MeetingHub-4

facarvalho·MeetingHub-4·v3/hardware/KiCad/MeetingHub-4-v3/MeetingHub-4-v3.kicad_pcb

MeetingHub-4 PCB layout, top view — open source board by facarvalho

About the MeetingHub-4 PCB

MeetingHub-4 is an open source PCB design by facarvalho, published on GitHub under the Custom license license. It is a 4-layer board measuring 106 × 86 mm, with 73 components from 19 distinct parts.

Other key parts include the NJM4580DD. By type, the board carries 25 diodes, 23 resistors, 6 connectors, 5 capacitors, 4 transistors and 4 relays.

It belongs with the audio designs in this gallery, and the repository also holds 2 earlier revisions of it.

From the project

A stripped-down spin of MeetingHub-4: only the microphone selector. One headset microphone is routed to exactly one of four notebooks, KVM-style, with four buttons. There is no audio/monitor path — you split each notebook with a TRRS Y-cable and monitor all four on an external mi

A stripped-down spin of MeetingHub-4: only the microphone selector. One headset microphone is routed to exactly one of four notebooks, KVM-style, with four buttons. There is no audio/monitor path — you split each notebook with a TRRS Y-cable and monitor all four on an external mixer.

- Route: the headset mic (J6 tip) goes to the NO contact of all four signal relays K1–K4, commoned. Each relay's COM goes to one notebook's mic jack (J2–J5); its NC goes through a 2.2 kΩ resistor (R20–R23) to ground. Energise Kn → notebook n gets the headset mic. De-energise it → that notebook's mic pin sees 2.2…

Main components on the MeetingHub-4

NJM4580DD

MeetingHub-4 bill of materials (BOM)

73 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NJM4580DD
DIP-16_W7.62mm
JRC
U1
4
2N7000
TO-92_Inline
onsemi
Q1, Q2, Q3, Q4
1
USB4085-GF-A
USB_C_Receptacle_GCT_USB4085
GCT
J1
5
PJ-3200B-4A
Jack_3.5mm_3pole_THT_Horizontal
Korean Hroparts Elec
J2, J3, J4, J5, J6
1
RXEF050
Fuse_Bourns_MF-RG500
Littelfuse
F1
4
G5V-1-DC5
Relay_SPDT_Omron_G5V-1
Omron
K1, K2, K3, K4
1
SW_Tactile_SPST_Angled_PTS645Vx39-2LFS
SW1
3
PTS645VK392LFS
SW_Tactile_SPST_Angled_PTS645Vx39-2LFS
C&K
SW2, SW3, SW4
1
P6KE6.8A
D_DO-15_P3.81mm_Vertical_AnodeUp
BORN
D1
20
1N4148
D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp
LGE
D2, D3, D4, D5, D10, D11, D12, D13 +12
4
D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp
D6, D7, D8, D9
2
K104K15X7RF5TH5
C_Disc_D5.0mm_W2.5mm_P5.00mm
Vishay
C1, C4
2
KM106M016D11RR0VH2FP0
CP_Radial_D5.0mm_P2.00mm
CX
C2, C3
1
K105K20X7RF5TH5
CP_Radial_D5.0mm_P2.00mm
Vishay
C5
10
CFR-25JB-52-10K
R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical
Yageo
R1, R2, R5, R6, R7, R8, R9, R10 +2
2
R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical
CCO
R3, R4
5
MFR-25FBF52-100K
R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical
Yageo
R13, R17, R21, R22, R23
4
CF1/4W-1KR-J
R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical
CCO
R14, R15, R18, R19
2
MFR0W4F100JA50
R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical
UNI-ROYAL
R16, R20

MeetingHub-4 design files

The KiCad project lives in the facarvalho/MeetingHub-4 repository on GitHub; these links point at the commit this page was built from.

MeetingHub-4: common questions

How big is the MeetingHub-4 PCB?

The MeetingHub-4 measures 106 × 86 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the MeetingHub-4?

73 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the MeetingHub-4 design files?

From the facarvalho/MeetingHub-4 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the MeetingHub-4 design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Earlier revisions in the repo: MeetingHub-4-v2, MeetingHub-4-v1

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