KF5N Radio Experimentation Site
T41 Blog
T41-2/T41-3 Off-The-Shelf Modules
This is a list of example off-the-shelf modules which are used in the T41-2 and T41-3 series of T41 radios. These modules are easily found on eBay, Amazon, Aliexpress etcetera.
QSD2 V1.0 Regulator Circuit Change
This note covers a recommended change to the QSD2EZ V1.0 circuit. The board will probably work well without this change, however, in some boards the 2.5 volt regulators may not properly regulate. This is due to the very light load on the regulators. Also, I recommend removing one of the regulators, and installing an option “DNP” (Do Not Place) so that the circuit works with a single regulator.
From the very beginning of the T41 project, Al and Jack recommended “Bourns” brand encoders. I agree that they are 100% correct on this.
T41-2 Low Power Amplifier Silkscreen Error
The back side silkscreen of the T41-2 Low Power Amplifier has an error in the silkscreen. This is on the back side.
The T41-2 Switch Matrix Board V1.0 is released:
The T41-3 Main Board V1.3 is released.
T41EEE.93 Arduino Firmware Released
A new version of T41EEE is released here:
https://github.com/Greg-R/T41EEE
T41EEE.93 adds an iambic keyer. This keyer is loosely based on this project: