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Last Updated:
Sunday, September 21, 2008 04:23 AM |
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Featured Circuit of the Week |
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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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All Circuits of the
Week |
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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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All Circuits of the
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Dave's other websites to visit: |
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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 |
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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. |
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