Power supply from 2.4 to 23 volts adjustable from an old AT or ATX PSU

Power supply from 2.4 to 23 volts adjustable from an old AT or ATX PSU

This is a guide how to modify an old AT- or ATX-PSU to an adjustable power supply from 2.4 to 23 volts. Those old power supplies have become useless. The maximum output current depends on the performance of the PC power supply. My modification works only, if the PSU has as regulator IC a KA7500, KA7500B, TL494 or DBL494.

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