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dual power supply with no center tap transformer ; half wave rectifier, voltage regulator 7812 7912 - YouTube
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How to build a power supply with two different output voltages - Electrical Engineering News and Products
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voltage regulator - Building a dual-rail, regulated DC power supply: 1 diode bridge & center-tapped secondaries, or 2 diode bridges and separate secondaries? - Electrical Engineering Stack Exchange
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What are some simple dual polarity power supply circuits using an Lm317 and an Lm337 but using a transformer without a center tap? - Quora
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