Leave it to sit for a few hours (I left mine overnight) to allow any charge left in the capacitors to drain. Ok, you will need a cross head screwdriver, a soldering iorn and a 1K resister.įirst, unplug the PSU and take it to the work bench. What about if you could keep the fan on all of the time at a low speed to encourage air circulation and, at the same time, allow it to ramp up to full speed if/when it was needed? This should keep the PSU quieter for longer and maybe even stop the need for the fan to run at full speed. At low current draw this is fine as the natural airflow removes the heat but start drawing 10A, the PSU gets hot and the fan comes on at full speed. The problem is that the cooling fan is idle most of the time. It’s a shame then that its so loud when the cooling fan kicks in. Rock solid, heavy built and, most important for radio users, its a linear power supply which means it’s nice a quiet RF wise unlike most switch mode PSU’s that make a lot of noise on the HF bands. The Palstar PS-30M (also called the Morning star PS-30M and the Manson EP-925) is a great PSU.
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