Miniature switching power supply, 220/±12 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply provides bipolar +/- 12V (low power) with full galvanic isolation from the 220V mains.
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Transformer T1 is wound on a ferrite ring M2000NM K20X10X5. Windings I, II contain 300 turns of PEV-2 wire 0,11 mm each, and windings III, IV - 90 turns of PEV-2 wire 0,25 mm each. The secondary windings must be well insulated from the primary windings. By the way, no one forbids winding another output winding and getting the output voltage that is required.
The advantage of this power supply is that it has a small size and weight.
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