[RFI] LED Under Cabinet Kitchen Lights YES or NO

Jim Brown jim at audiosystemsgroup.com
Fri Jul 26 12:36:15 EDT 2013

On 7/26/2013 3:04 AM, Mike Ryan wrote:
> I did some reading on line where one guy indicated that the power 
> supply (he assumed) to his under cabinet lights was destroying his AM 
> radio. 

This problem is so common that it is nearly universal. 99.99% of this 
stuff is sold with a noisy switching power supply. One aspect of the 
problem that makes a solution difficult is that a transformer or linear 
power supply that can provide the needed current often does not fit in 
the available space.

The good news is that LED lighting draws less current than other 
lighting devices, so an old analog wall wart may be enough to do the 
job.  For the last few years I've been seeing vendors of little LED 
lighting strips at hamfests like the ones Jeff, AC0C, describes, and 
I've bought a few that I haven't gotten around to installing yet. My 
neighbor, W6GJB, has used them in a nice portable rack that he built to 
take his K3, P3, and KPA500 out on CQP expeditions.

Going through my junk box the other day, I found four vintage linear 
wall warts rated for 1A at 12VDC, and you can buy a lot more for a buck 
a piece at most hamfests.

73, Jim K9YC

More information about the RFI mailing list