NOTE: I STILL SELL THE 240V VERSION FOR THOSE COUNTRIES WHICH REQUIRE IT, JUST SAY SO AFTER YOU PURCHASE THE ITEM IF YOU WANT ME TO SEND THE 240V VERSION.
This custom power supply provides enough power to run both the TRS-80 Model I keyboard unit and Expansion Interface (and a fully packed EI at that), and produces less heat and RF noise than the old Radio Shack "black brick" supplies. I have been using a beta version of this PSU since 2013.
This project is aimed at experienced electronics enthusiasts who can solder, test and confirm output voltages, and crimp cable connectors. Once completed you have a very reliable heavy duty PSU which should give trouble free operation for decades.
To keep shipping costs down you need to buy the toroid transformers in your own country and solder them on yourself (use Talema 70060K and 70061K or Amgis L01-6360 & L01-6361).
This is the version which comes with the two output cables (a short one for inside the EI and a longer one to power the Model I keyboard unit). Some people find these cables fiddly to make, and for those who don't want to be bothered with the cables I include them with this kit, hence the higher price than the basic $30 PSU kit.
The 4th picture shows how the PSU fits inside the EI.
You get: PCB circuit board with discrete components as pictured, and long and short power output cables.You need to: solder on two toroid transformers, AC power cable, test the outputs are within range (16-17V on the AC and DC outputs), and fabricate cables to supply your Model I and EI.Note: can be set up for 120V or 240 V operation by using different transformers.
Shipping will be $13.50 worldwide.