Power Supply 13.8V

An Amateur Radio Power Supply 13.8V 30-40A with short circuit protection - all you need to run the most common 100-200W Amateur Radio transceivers...!

Foreword
Functions
Project schematic, PCB layouts and data sheets
Pictures

My homebrewed 13.8V 30-40A primary Power Supply, with built in short circuit protection, build on POWER FET transistors.

Foreword

This is the primary Power Supply for my Amateur Radio Shacks transceiver equipment. The Power Supply is build around the LM723 controller and four BUZ24 (or IRF150) power N-Channel FET transistors. FET transistors are used because of the simplicity of controlling the current through these transistors, it's simply voltage controlled, and because of the low power consumption of the controller board. The Power Supply is initially based on ideas from TF3MA.

Functions

Project schematics, PCB layouts and data sheets

Pictures

The Printed Circuit Board (PCB) and the layout

...from another angle

...a close up of the controller PCB

Here are the holes for connection to the four FET's gate and source.
The FET's drain is connected directly to the '+' pole of
the 6 x 10.000 electrolyte capacitors. The 15V zener diodes,
between source and gate, are not mounted when this picture
has been taken.

Mounting two of the four BUZ24 FET's at one of the two
heat sinks. All four FET's are isolated from the heat sink
by slices of silicone between the FET's and the heat sink and
small pieces of plastic between the screws and the heat sink.

Two FET's mounted at the rear of the heat sink

An inside look at the Power Supply. At the left is a transformer
for powering the controller board next to it. In the middle
are the 6 x 10.000 uF electrolyte capacitors. At the right is a
part of the heavy duty ring transformer.