RF Multiplexer 8ch 1GHz
This is a PCB-design + Arduino firmware for an Ethernet-controlled 1:8 RF-multiplexer (SP8T). It allows selecting as output one of eight input-channels, as commonly used e.g. in timing-laboratories when one wants to measure many RF-sources (clock outputs like 1PPS or 10MHz) with a single instrument (frequency or time-interval counter). The unselected channels are terminated at 50 Ohms. The design is for two independent MUX-boards to fit in a 1U 19” rack enclosure together with an Arduino MKR ZERO microcontroller with Ethernet interface. The firmware allows for simple control over http with a browser or e.g. the python requests library.
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19 inch TimingLatest News
2018.11 design update
migrate to kicad5 symbols and footprints. only minor changes to pcb-design. new PDF hardcopies of 2018.11 PCB, SCH, and BOM.
2018 September: Arduino MKR Zero controller and revised PCB
Revised PCB with 10-pin IDC/ribbon-cable for powersupplies and SPI-control. Control by Arduino MKR Zero with Ethernet shield. This arduino will be easier to integrate into a 1U enclosure, and removing the voltage-regulators for the mux-PCB simplifies the board.
2018 August: design revision
Revised design 2018.08 with a single 10-pin IDC connector for 5V and 3.3V supplies and SPI-communications. Also working on Arduino MKR ZERO controller.