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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AC-DC LM317 LM337 Adjustable Voltage Regulator Power Supply Positive Negative Dual Power 5V 12V 24V PCB FOR Amplifier
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Amazon.com: LM317 LM337 Voltage Regulator Module PCB Power Regulator Module Adjustable Stabilized Board AC10‑24V Input for Circuit Protection : Electronics
![Amazon.com: LM317 + LM337 / Negative Dual Power Adjustable Power Supply Board/Electronic Component : Industrial & Scientific Amazon.com: LM317 + LM337 / Negative Dual Power Adjustable Power Supply Board/Electronic Component : Industrial & Scientific](https://m.media-amazon.com/images/I/815Tq56NiUL.jpg)
Amazon.com: LM317 + LM337 / Negative Dual Power Adjustable Power Supply Board/Electronic Component : Industrial & Scientific
![operational amplifier - Design Questions for Dual Tracking Power Supply Using 15 Volt 800mA Secondary Transformer, LM317, LM337, and Op Amp - Electrical Engineering Stack Exchange operational amplifier - Design Questions for Dual Tracking Power Supply Using 15 Volt 800mA Secondary Transformer, LM317, LM337, and Op Amp - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/tBIca.png)