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magazines@dkoonce.com
User Rank
Silver
Circuit improvement suggestion
magazines@dkoonce.com   8/8/2012 4:16:15 PM
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Replace the bipolar transistor with a MOSFET. Be sure the Rds is low. This should be less power loss than what you have and avoid the heatsink.

Rob Spiegel
User Rank
Blogger
Re: Amazing Co-incidence
Rob Spiegel   6/21/2012 5:03:00 PM
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The link works fine, Foxzzy. Thanks much for the input.

John Duffy
User Rank
Platinum
Re: Amazing Co-incidence
John Duffy   6/20/2012 8:52:24 PM
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Interresting.  It's amazing how people can design such complex circuits that work.  Nice job!

foxzzy
User Rank
Iron
Re: Amazing Co-incidence
foxzzy   6/20/2012 8:08:48 PM
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http://www.google.com/patents?vid=USPAT5611223&id=pgoiAAAAEBAJ&dq=Joseph+C.+Spitzer

You don't have to worry about infringiment - it has long expired, and it is in the public domain now....

Hopefuly that link will work, I cannot try it until I post this, and if it does not, I'll come up with some other way to get to it.......

John Duffy
User Rank
Platinum
Re: Amazing Co-incidence
John Duffy   6/20/2012 7:31:07 PM
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Foxzzy, I cannot seem to open the link properly.  I get an error page.  I'd like to see another design for ideas, and mostly to make sure I'm not infringing on it.   

John Duffy
User Rank
Platinum
Re: Make magazine
John Duffy   6/20/2012 7:20:13 PM
Thanks!  I do appreciate the huge feedback I've recieved on this project. 

Frauenfelder
User Rank
Iron
Re: Make magazine
Frauenfelder   6/20/2012 4:18:05 PM
Thanks very much, Rob. I appreciate it very much. And like I said, all of us at Make are fans of DesignNews.

And my apologies to John! Your project and video are terrific. I like the way you took an existing project and improved upon it. Congratulations.  -- Mark

Rob Spiegel
User Rank
Blogger
Re: Make magazine
Rob Spiegel   6/20/2012 3:48:50 PM
Point well taken, Mark. John acknowledged you in the video, even showing your magazine. Good magazine.

Rob Spiegel
User Rank
Blogger
Re: Make magazine
Rob Spiegel   6/20/2012 3:46:28 PM
Good point, Zenock. The oversight was mine. As a former small magazine publisher, I should be more atuned to giving credit where credit is due. I could blame deadlines for numbing the brain, but really there is no excuse. I'll remember this going forward. 

In  the meantime, the comments give good credit.

Rob Spiegel
User Rank
Blogger
Re: transformer coupling
Rob Spiegel   6/20/2012 3:42:42 PM
The interesting thing about John's project is that it wasn't insprired by anything on the Internet, but rather by a print magazine, Make magazine to be exact.

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