A simple passive multiplexer providing :
- two 3.5mm jack inputs connected to two PC line outputs,
- two 3.5mm jack outputs connected to active speakers and a headset,
- one 3.5mm jack input connected to the headset microphone,
- two 3.5mm jack outputs connected to two PC microphone inputs.
+------+
Line out | | Mic in
+----------------| PC 1 |<---------------+
| | | |
| +------+ |
| |
| +------+ |
| Line out | | Mic in |
| +------------| PC 2 |<-----------+ |
| | | | | |
| | +------+ | |
| | | |
v v | |
+----------------------------------------------+
| AUDIO MULTIPLEXER |
| |
| Audio Audio Mic |
| in out in |
| |
+----------------------------------------------+
| | ^
| | |
+------+ +-----+ +--------+
| | |
v v |
+----------+ +---------+
| | | Headset |
| Speakers | | with |
| | | mic |
+----------+ +---------+
The multiplexer microphone input is designed to be driven separately in case this is needed later.
The PCB has been designed with KiCad 6.0.6.
Naked PCB :
Assembled PCB :
The casing has been designed with FreeCAD 0.19. The multiple DXF files generated by FreeCAD have been combined using LibreCAD 2.1.3. The casing has been designed to be laser-cut in a 4-mm thick 304 stainless steel.
Steel plates :
Casing top :
Casing bottom :
Casing front :
Casing rear :
Casing front angled :
Casing rear angled :
