Unless you're in a screen room or 100 miles from civilization, the background
noise is going to cover up any minuscule noise that the best switchers for ham
use are going to emit.
Dale K9VUJ
On 04, Aug 2016, at 7:59, WD8ARZ <wd8arz@ix.netcom.com> wrote:
Any AC switching power supply simply can not be as quiet as a transformer type
power supply. Also AC switching power supplies have some of their input
circuitry across the AC power input any time that supply is plugged into the
wall .... therefore is more subject to damages from transients and lightening
events on the AC power lines ..... even if the equipment connected to it is
powered off. Some AC switching power supplies have RFI emitted that can only be
eliminated by unplugging it from the wall ..... or using a real world
mechanical power switch that actually disconnects the AC input.
Regards and 73 from Bill - WD8ARZ
On 8/3/2016 1:18 PM, Dave Cole wrote:
> Hi,
> Can I get a few suggestions for a 12 V switcher that is quiet in the HF
> spectrum? A friend needs one, and has asked about a quiet one...
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