View Single Post
  #6   Report Post  
Old January 1st 09, 03:55 AM posted to rec.radio.amateur.equipment
[email protected] jidanni@jidanni.org is offline
external usenet poster
 
First recorded activity by RadioBanter: Dec 2007
Posts: 5
Default power supply hums when electric blanket on

a You've got a cheezy SCR-based control in the electric blanket.
Ah, http://en.wikipedia.org/wiki/Silicon...lled_rectifier
a Brute force filter at the electric blanket, and/or a snubber on the SCR.
Ah, http://en.wikipedia.org/wiki/Snubber
a Get an electric blanket that uses a (zero-crossing) triac control.
But its my http://en.wikipedia.org/wiki/Security_blanket
a Heavier, shorter power wiring to the electric blanket, the UPS and ham
a radio gear, or both.
OK, and what is that brute force filter, and do those snubbers come in
AC inline versions that you just plug into requiring no snippers for dumbo me?
a Ditch the electric blanket and get a live-in friend!
Tried that last time.