HardLabs

TR-Switch

kholia·Simple-TR-Switch·v4/TR-Switch.kicad_pcb

TR-Switch PCB layout, top view — open source board by kholia

About the TR-Switch PCB

TR-Switch is an open source PCB design by kholia, published on GitHub. It is a 2-layer board measuring 43.5 × 40.7 mm, with 14 components from 10 distinct parts.

By type, the board carries 3 diodes, 2 capacitors, 2 resistors, 1 transistor and 1 relay.

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

From the project

VU3CER's non-RF-sensing, MCU controlled Simple T/R Switch with RX Grounding!

This is a non-RF-sensing, MCU PTT-controlled Simple T/R Switch with RX Grounding feature which can be built for less than 2 dollars!

It was designed, and tested for https://github.com/kholia/Easy-Transceiver project.

TX power is 10W from IC-705 operating in FM mode.

- With a 2-channel relay as a T/R switch, when both RX Ground and Center are disconnected and left floating, a voltage of around ~2.2v is induced across RX connections which is unsafe for typical SDRs.

TR-Switch, from the project README
From the project README

TR-Switch bill of materials (BOM)

14 components, 10 distinct parts.

QtyPartRefs
1
2N3904
Q1
1
RelayPower1
5V1
3
SMA
ANTENNA1, RX1, TX1
1
Omron G5V-2 / OEN 46-05-2C
K1
1
PTT1
PTT1
3
1N4148
D1, D2, D3
1
10n
C1
1
10u
C2
1
10k
R1
1
470
R2

TR-Switch design files

The KiCad project lives in the kholia/Simple-TR-Switch repository on GitHub; these links point at the commit this page was built from.

TR-Switch: common questions

How big is the TR-Switch PCB?

The TR-Switch measures 43.5 × 40.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the TR-Switch?

14 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the TR-Switch design files?

From the kholia/Simple-TR-Switch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the TR-Switch design in my own project?

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

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