This power supply was flown on the Gemini 12 mission piloted by astronauts James Lovell and Edwin Aldrin in November 1966. It was the last Gemini mission and included a 5 1/2-hour EVA by Aldrin. The unit provided several DC voltages to the Inertial Measurement Unit (IMU), and the Gemini digital computer. These systems provided the guidance and navigation required by Gemini missions, which involved the ability to change orbits, rendezvous, and dock with other spacecraft.
NASA transferred this to the Smithsonian in 1973.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.