Jan Kotarski

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Description

Dual PSU LM317/337

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!

Jul 11,2019

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Dual PSU LM317/337

2 Layers PCB 38.1 x 77.22 mm FR-4, 1.6 mm, 1, HASL with lead, Black Solder Mask, White silkscreen

Small, integrated PSU for audio or other projects. EL30 transformer on board, can be used with variety of voltages.

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Published: Jul 11,2019

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Topic

DIY Electronics

Audio

PSU lm317 power audio

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SzB-Audio
Hi there, not bad, but in the next version: - prefer thermal connections instead of direct connecting the pads at the copper pour. It's much easier to solder the components (e.g. big caps). - use wider power traces, it costs nothing.... - use bigger pads for the output terminals - make a larger distance bw. traces and mounting holes (rings) - do not forget the protection diodes! - what about heatsink???

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Jul 18,20191 Comments
Jan Kotarski 2019-08-17 19:53:02Reply
Hello, thanks for the feedback! -I got used to designing the boards without thermal isolation. I know that it's easier to solder but I prefer it this way. -the transformer of this size can supply no more than 100mA per side, so traces this wide and no heatsink is OK in this case. -The mounting holes are big enough to accomodate usual M3 screw with a lot of clearance, but you are probably right, I could increase the distance easily.
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