[RFI] Quiet Switching Power Supply?

[WD8ARZ]

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...