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Audio Control SA-3050A RTA Power Supply and Battery Pack Design Reverse Engineering Part 1

I begin to reverse engineer the power supply, battery pack option, and AC mains conversion to 240V on the Audio Control SA-3050A.

Watch the full video for Part 1 on YouTube for all the details, there is a second video coming soon showing the actual design and build of the battery pack and 240V power supply system.

YouTube Video:

Files from a similar unit showing circuitry, sent to me by Kim: