I designed this switching supply for one of my own projects. This unit replaces the bulky power transformer in a 25w vacuume tube amplifier. This circuit uses the Power Integrations TOP249 PWM and
driver circuit configured in flyback mode. I designed this supply for 5 outputs, +400v, +6.3v, +5v, +12v and -12v. The unit is regulated from the 6.3v output. Due to the flyback configuration, the -12v delivers
very small current. This voltage is used for bias on the output tubes.
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