KF5N Radio Experimentation Site
T41-2 Switch Matrix Board
T41-2 Switch Matrix Board
The “T41-2 Switch Matrix Board” includes an array of 18 pushbutton switches. The switches are for menu and radio control functions.
The Github repository is here:
https://github.com/Greg-R/T41-2_Switch_Matrix
The board was designed using Kicad version 10. This new Switch Matrix Board is almost functionally identical to the original T41 Switch Matrix which was designed by Al Peter AC8GY.
Purchase the book “Digital Signal Processing and Software Defined Radio” by Albert Peter and Jack Purdum here:
https://www.amazon.com/Digital-Signal-Processing-Software-Defined/dp/B0F5BDQZW3
License
The T41-3 Main Board PCB design is licensed under the CERN Open Hardware Licence. A copy of the license is included in this repository. The license is also available via this link:
https://ohwr.org/cern_ohl_s_v2.txt
Digikey BOM
Here is the BOM for this board at Digikey:
https://www.digikey.com/en/mylists/list/F6FOAFWFOM
The Key to Good Switch Matrix Function
It is important to use the proper switch in the Switch Matrix Board. There are a few parameters that make this particular switch an optimal choice:
Please use this switch or an equivalent!
Build Tips
This is an easy board to build. Here are the recommended steps.
- Place and solder all surface mount components on the front side of the PCB.
- Insert all 18 switches into the front side of the PCB and hand solder them.
- Insert the JST connector into the back side of the board in the correct orientation and solder.
That is all!
High Resolution Photos
Links to photos of a fully constructed T41-2 Switch Matrix Board follow. Click on the image for high-resolution photos.
