An A/B battery replacement for the Zenith TransOceanic H-500 radio with filament regulation

KA7OEI built a battery pack to replace the obsolete “A/B” battery for Zenith TransOceanic (ZTO) H-500 and wrote a post on his blog detailing its assembly: There are several things that I decided that this voltage converter should do: Automatically power up and shut down when the radio is turned on and then off Cause […]

Raspberry Pi level shifters and monitoring

Stuff4Pi posted his ConvertPi, a Raspberry Pi GPIO full level converter & monitoring, in the project log forum: I would like to introduce my first Raspberry board: a GPIO bi-directional level translator (3.3V <-> 5V): – This is an in-between expansion board that you plug in the RPi P1 connector which gives a bi-directional level […]