Making a Psion Series 3a/c/mx USB power cable

After my previous success recovering data from my old Psion Series 3a palmtop, I decided I needed to bring some of the cables into the 21st century. While batteries usually last weeks with the Psion, using it on my desk was frustrating as it powered down after 5 minutes to save battery power. Therefore I decided the first cable to work on was the mains adapter and what better way to update it than make it a slim ultra-portable cable powered by USB – I could then use USB wall plugs, my MacBook Pro or even a humble USB power bank to power my Psion. Time to get out my wire snippers and wait for the soldering iron to warm up!
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