Breaking News
Comments
Newest First | Oldest First | Threaded View
nicolas.mokhoff
User Rank
Rookie
re: Power Tip 52: Making over the wall wart
nicolas.mokhoff   10/24/2012 1:17:36 PM
NO RATINGS
Thanks, Robert. Links in story have been corrected.

Robert K
User Rank
Blogger
re: Power Tip 52: Making over the wall wart
Robert K   10/5/2012 1:48:34 PM
NO RATINGS
Try these links, the last two in the article are wrong. http://www.ti.com/tool/pmp7389 http://www.ti.com/tool/pmp8286

Hughston
User Rank
CEO
re: Power Tip 52: Making over the wall wart
Hughston   10/4/2012 3:27:58 PM
NO RATINGS
This doesn't look much more expensive than a linear wall wart. A linear would have the input fuse, transformer, rectifier on the secondary, large filter cap and a load resistor to drain the cap charge. The rectifier is not always in the wall wart; it can be in the charged product. A more efficient way to use a linear wall wart is to give it a higher source impedance and put a switch in the product being charged and pulse charge with the input.

WKetel
User Rank
Rookie
re: Power Tip 52: Making over the wall wart
WKetel   10/4/2012 12:37:59 AM
NO RATINGS
The one more easy way to cut losses, at this point, is to add a switch so that the AC input can be switched off. That should have been mandated 40 years ago when the wall warts were starting to appear. Of course it would have been a serious hardship and it would have raised the cost of each unit by about 15 cents, but consider how much wasted power it would have saved. At some point the folks who make all of the laws need to tell the whiners and complainers to "shut up, because we don't care about the profit that you lose." If it is OK to mandate all kinds of efficiency increases in cars, which requires all manner of new innovations, it should certainly have been OK to mandate on/off switches, which were nothing new, and very well understood.

GREAT-Terry
User Rank
CEO
re: Power Tip 52: Making over the wall wart
GREAT-Terry   10/1/2012 11:08:40 AM
NO RATINGS
It is a good idea to use "quasi-resonant flyback" in low power wallwart design. It circuit is so simple! How much can be further reduced?



Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

MSGEQ7-Based DIY Audio Spectrum Analyzer: Testing
Max Maxfield
13 comments
In my previous column on this topic, we discussed the step-by-step construction of the first pass at a MSGEQ7-based DIY audio spectrum analyzer for use in my BADASS Display project. Of ...

Karen Field

June 2014 Cartoon Caption Winner
Karen Field
13 comments
Congratulations to "Wnderer" for submitting the winning caption for our June cartoon, after much heated conversation by our judges, given the plethora of great entries.

Jeremy Cook

Inspection Rejection: Why More Is Less in a Vision System
Jeremy Cook
3 comments
Albert Einstein has been quoted as saying, "Everything should be as simple as possible, but not simpler." I would never claim to have his level of insight -- or such an awesome head of ...

Jeremy Cook

Machine Fixes That Made Me Go 'DUH!'
Jeremy Cook
21 comments
As you can see in my bio at the end of this article, I work as a manufacturing engineer. One of my favorite things that happens on a Friday late in the afternoon is to hear my phone ring ...

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)