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Discover Circuits' Magazine Previous Issues


January 2012
Discover Circuits Magazine

 

Happy New Year!

Featured Circuit of the Week

Battery Amp-hour Capacity Tester
I bought some lithium ion rechargeable batteries a while back. I was planning on using them to modify some solar powered LED spot lights.  What I like about these new batteries is that they are the same size as a standard 1.5v alkaline AA cell.  With such a package, I can use a standard AA battery holder.  The battery manufacturer claims an amp-hour capacity of 2.2 amp-hours.  Usually, these amp-hour figures are made using rather small loads, conducted over a long period of time. 
......

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Hot Links to Check Out!

Counterfeit Products more than a Nuisance!
Faraday Switches are tiny one inch cube electronic modules using a capacitance change technique.  They draw very low current and are ideal for battery powered applications. 
Hobby Corner  has hobby circuits -- check it out. 
Circuit Solutions Dave Johnson shares solutions to tricky electronic design problems.
Dave's Circuits Special section with circuits designed by David A. Johnson, P.E.
Call Dave for your next consulting project

 Dave's other websites to visit: 

Imagineeringezine - recource materials for inventors, hobbyists, scientists & engineers

Discover Solar Energy - Portal for Renewable Energy Resources

Consulting Engineering Services from conception to production

collection of resources for inventors,
hobbyists, scientists & engineers
resource portal for information
regarding renewable, alternative
or sustainable energy
Dave Johnson & Associates -
consulting services  for new products from conception to production or improving the
cost & performance of
existing products

David A. Johnson, P.E. is an electronics engineer with over 30 years practical experience in the areas of analog & digital design, fiber optics and RFID.  Electronics is his vocation, hobby and passion.  He is a published author with articles and designs in EDN, Electric Design, Midnight Engineering and Popular Electronics.   Throughout his career, Dave's imaginative approach to design has resulted in applying new technologies in creative and cost saving ways. 


October 23, 2003
Remembering Bob the Beagle

Beagle Photo Album
 
 
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