HardLabs

Themis

F6ITU·Themis

Themis PCB layout, top view — open source board by F6ITU

About the Themis PCB

Themis is an open source PCB design by F6ITU, published on GitHub. It is a 2-layer board measuring 100 × 50 mm, with 29 components from 15 distinct parts.

Other key parts include the LMC6482. By type, the board carries 13 resistors, 5 capacitors, 4 connectors, 4 diodes, 2 transformers and 1 IC.

It belongs with the rf & radio and retro computing designs in this gallery.

From the project

Dual directional coupler (fwd/refl and pure signal, Alex retrofit)

This coupler is based on a "tandem match" design with input compensation capacitor.

It should be able to fit any kind of amplifier, from 10 to 150 W

The pcb itself supports the 2 main toroids of the transformer, input and output coax connectors and two coupled outputs.

These outputs are followed by a dual detector located on each branch of the coupler. The detected voltage is buffered by a dual rail to rail op amp. The output of the operational amplifier is then lowered by a resistive divider that keeps each output below the maximum input voltage of Angelia's ADC

Main components on the Themis

LMC6482

Themis bill of materials (BOM)

29 components, 15 distinct parts.

QtyPartRefs
1
LMC6482
U1
1
Conn_01x05
J5
3
SMA
J7, J8, J17
1
Tr 1/33
T1
1
Tr 33/1
T2
4
BAT54
D1, D2, D3, D4
1
10p
C1
4
10n
C2, C3, C4, C5
2
53E
R1, R3
1
806E
R2
2
1k
R4, R13
2
1K8
R5, R12
2
220k
R6, R11
2
100k
R7, R8
2
100E
R9, R10

Themis design files

The KiCad project lives in the F6ITU/Themis repository on GitHub; these links point at the commit this page was built from.

Themis: common questions

How big is the Themis PCB?

The Themis measures 100 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Themis?

29 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Themis design files?

From the F6ITU/Themis repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Themis design in my own project?

The repository has no license, so all rights stay with F6ITU. Use it as a reference, and ask the author before reusing the design.

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