Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

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will help you find quick design ideas to electronic design problems.

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Last Updated:   Sunday, September 21, 2008 04:23 AM

Featured Circuit of the Week

Solar Powered Lithium Ion Battery Charger
The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery. The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6 volt solar panel. ...

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Hot Links to Check Out!

Counterfeit Products more than a Nuisance!
NEW   Battery Chargers Catalog from TI
Hobby Corner  has hobby circuits -- check it out. 
Electronics Resources  includes links to components,  manufactures, distributors, journals, newsgroups, and much, much more
Circuit Solutions Dave Johnson shares solutions to tricky electronic design problems. 
Discovered New Products List accumulated by Dave of new electronic components and products. 
Dave's Circuits Special section with circuits designed by David A. Johnson, P.E.
Component Resource Section is a directory of electronic component manufactures, useful links, and much more

Featured Circuit Last Week

Isolated Power Supply for Digital Panel Meters -- September 13, 2008
Many inexpensive digital panel meters, such as the one shown below, are designed to operate from a 9v battery.  However, the nature of the panel meter internal design often requires that the DC supply used to power the device be isolated from the ground terminal of the panel meter’s input.  This often makes it difficult to use with a common connection between a DC power supply ground and a sensor’s circuit ground.  But, you can generate this floating voltage fairly easily using the simple circuit below.

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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,
featuring Betty Sue & Billy Bob



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