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Simple dual output power supply. Using popular LM317/LM337 voltage regulators. Output voltage is set by the R1, R2, R3, R4 resistors.

Use EL30 core transformer. Voltage before regulators must be at least 2V higher than the desired output voltage. I recommend 2x15VAC transformer for 15V ouput, 12VAC for 12V output etc.

C7, C8, C9, C10 need to be rated accordingly to used transformer and set output voltage.

Useful for audio preamps etc.

PCB dimensions 77x38mm, mounting holes M3 70x30mm.

Message me if you have any questions!