My very first project as an amateur radio operator was a power supply unit. It is transformer based. And i build this from the schematics from the net. Also i did not have knowledge of UV PCB back then, so it was build on a vero board.... Not recommended. I added a volt and ammeter not in the schematics. The volt meter is connected across the +ve and -ve DC output and the ammeter is thru the DC +ve output. Also i recommend a bigger or 3 or 4 22000uF capacitors in parallel and a 18V 22A transformer instead of 15V.
To those who want to built this here are the schematics or you can get newer designs from http://users.belgacom.net/hamradio/homebrew.htm.
Click to enlarge
This design is no longer available on that site. Below my finished product.
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