[AMRadio] LED Magnifying Lamp by Duratool


Rob Atkinson ranchorobbo at gmail.com
Tue Sep 22 13:57:05 EDT 2015


And what would it have cost the manufacturer to put in a cap at the
plant?   Bought in quantity maybe 10 cents per lamp?  But no, who
cares about a bunch of geezer hams and swls.  No one listens to the
radio anymore anyway.

73

Rob
K5uJ

>    "But unfortunately, when the light is on, it gives off a fair bit of
>    RF hash that can be heard in a radio. I added a 0.022uF 630V cap at
>    the output terminals to the LEDs and that quieted it down a bit. I
>    wish that the people that spec out these designs would pay more
>    attention to spurious RF that some power supplies cause."
>
> I took it apart when it got here.  The power supply is in the base. I went
> with a bigger value cap.  I went with a 0.068uF @ 630V one. Now I got rid of
> all the hash!


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