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Old 15th May 2021, 12:54 am   #15
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
Default Re: Big DC power supply

The (rebadged?) Palomar 2m amplifier looks a bit like an old KLM 2m amplifier. These were available in 70W/140W/160W flavours. The heatsink looks very small on the amp but it does look like it has some sort of fan as well.

Looking closer, yours looks like a 140W or 160W amp and I think these had a pair of MRF24x BJTs as the final stage. Assuming 150W peak output this would mean 11A peak current if it was 100% efficient. However, the efficiency is going to be in the ballpark of 50% so the amp might draw just over 20A on peaks.

It probably wouldn't be wise to run that amp at a high duty cycle so the PSU design you have chosen should perform very well if run at 50% duty. I think your larger PSU heatsinks would barely run 'coffee cup' warm at a continuous 12A load current for example.
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