Power
The Power specitification for The Analog Thing is rather simple: Any standard USB power supply should do. The power demand is really minimal, the integrated DC-DC power supply (TBA 2-0522) can convert 2W of power from 5 VDC to 12 VDC. See Machine Units for details. For the schematics about power supply in the computer, see File:Anathing v1.0 base 1.pdf.
Pre-series THATs had a USB connector of Type A. This was an unusual design choise for client-like (non USB host) devices. However, already the series 1.1 (the first one shipped to customers by Anabrid) had a modern-day USB-C connector. A high-quality USB A to C cable is also included with each THAT.
Also note that USB is adopted only for power and no data transfer at all. The Analog Thing is analog and a USB communication would require the presence of a digital computer (such as a microcontroller) within the Analog Thing.