Here is a simple 12 volts DC to AC inverter circuit. This 120V AC power source is built with a simple 120V:24V or 110V:24V center-tapped control transformer and four additional component. This circuit ...

We thus explored useful circuits that could be made with such ... they learned that converting AC currents into DC currents at cryogenic temperatures is a requirement of all cryogenic circuitry ...

This, of course, isn’t true. Alternating current (ac) or direct current (dc) circuits are capable of carrying very different currents, as illustrated by the ratings on the switch in Figure 1.