Circuit : Volker Jeschkeit Italy 
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A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps. The secondary output of the transformer is switched and therefore power usage is efficient. The output can be tapped at 6 Volt, 12 Volt, 24 Volt.
Images of Volker's prototype
Click the image for a larger view.
Click the image for a larger view.
