Build two of these modules for a dual supply!

There is a mis-print on the silkscreen for the bridge rectifier. It is marked "KBU-406", it should say "KBU-604", which is a 6A/400V bridge. I don't believe there is such a thing as a KBU-406.

The 1k trimpot is used to adjust the 0V output when the voltage pot (RV1) is set to minimum. You can use the +Vsense pin of J3 to measure with a DVM from with respect to GND (-V) and trim the 1k trimpot for a reading of close to 0 (+/-5mV).

The heatsink chosen for this project is Jaycar catalog # HH8570 which is 105mm x 55mm x 33mm. You can use whatever heatsink you choose, as long as its efficiency is 2.5 degrees Celsius per watt, or better.

Below is a drilling guide for the heatsink:

Link to my YouTube video featuring this PCB plus assembly hints:

Schematic and Layout

Schematic

lab-supply-schematic.png

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May 10,2023

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0-15V 0.60mA-5A Adjustable Lab Power Supply

2 Layers PCB 74.9 x 105.4 mm FR-4, 1.6 mm, 1, HASL with lead, Blue Solder Mask, White silkscreen

Need a basic power supply that can do up to 15V (if not a bit more depending on load) and capable of at least 3 amps? Then this is for you!

2231

Published: May 10,2023

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