[RFI] Non-switching wall warts availability?

[Michael Coslo]

To be completely accurate, well designed Switching power supplies are not terribly noisy. I have several including a DM-330V, that are very quiet. 

I also have Wall Wart supplies that are quiet as well. And having a Flex Radio, I can see noise very well. 

Note, I have an HP printer Power supply that I have to disconnect the supply from the wall in order to operate. 

- Michael Coslo -
Frequency Coordinator, Beaver Stadium
814-404-3991
mjc5 at psu.edu
mjcn3li at gmail.com

> On Nov 26, 2018, at 4:20 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> On 11/26/2018 8:49 AM, Andy KU7T wrote:
>> I am looking for a 12 V one. Anyone have recommendations?
> 
> See my detailed advice in http://k9yc.com/KillingReceiveNoise.pdf about using vintage non-switcher wall warts. Look in second hand stores and at ham flea markets. I buy all I can find. The going price is typically a buck apiece.
> 
> There's also a slide show pdf with more photos. The text version ran in NCJ in two parts a couple of years ago.
> 
> http://k9yc.com/KillingRXNoiseVisalia.pdf
> 
> 73, Jim K9YC
> 
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