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Old 13th May 2021, 10:27 pm   #10
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
Default Re: Big DC power supply

It looks like you have the main heatsinks fitted just inside the enclosure which is a bit unconventional. My PSU heatsinks were fitted externally at the rear of the PSU and these still used to get quite hot when the PSU was tested into a continuous load of (say) 15A. Things weren't so bad when using a typical 100W HF radio on SSB though.

I purchased the same toroidal transformer as shown in the original article and this was a very pretty transformer. However, it can produce quite a bit of low frequency hum noise. During the day this wasn't a problem but back then this power supply was in my bedroom and I could certainly hear it humming away at night if I forgot to turn the PSU off. It might be worth a few experiments with your chassis/lid/vents to make sure you don't let the enclosure act as a speaker for the hum noise from the transformer.
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