Insanely Digital
Dedicated to the restoration of vintage Apple computer technology.
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Dual Voltage Early Macintosh Power Supply
The dual voltage power supplies in Mac 128, Mac 512, and Mac Plus work by using two capacitors in series. They function as 220-240V units but can switch to 120V with a wire link or external switch. This changes the full bridge rectifier into two half-wave rectifiers and creates a voltage doubler circuit. The switch…
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