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Last Updated:
Sunday, May 04, 2008 05:09 AM |
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Featured Circuit of the Week |
Light to
Frequency Converter
This circuit uses a CMOS version of the classic 555 timer, to
form a light intensity to frequency converter. A small PIN
photo diode is used as the light detector. The pulses
produced are short, so in some applications you may want to
stretch them or feed them through a flip/flop to produce a
square wave signal. Although the circuit shown is designed
for a 5v supply, it could operate from almost any voltage from
3v to 15v. |
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All Circuits of the
Week |
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Featured Circuit Last Week |
Universal Flasher Using a Latching Relay
Latching relays are nifty devices. Most contain two separate
coils. When a voltage is applied to one coil the relay
latches in one state and stays in that state until voltage is
applied to the unlatch coil. Since the latching and
unlatching pulses only need to last about 25 milliseconds, it
is possible to control a sizeable amount of power using little
energy. |
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All Circuits of the
Week |
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Hot Links on
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Electronics Resources includes links to components, manufactures, distributors, journals, newsgroups, and much, much more |
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Circuit Solutions Dave Johnson shares solutions to tricky electronic design problems.
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Discovered New Products
List accumulated by Dave of new electronic components and
products. |
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Dave's
Circuits Special section with circuits designed by David A. Johnson, P.E. |
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Component Resource Section
is a directory of electronic component manufactures, useful links, and much more |
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Discover Circuits' Book Corner
collections of books to buy -- including circuit collections, circuit design,
electro-optics and much more |
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Interesting Links! |
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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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Dave
is available for consulting projects. |
October 23, 2003
Remembering Bob the Beagle |
Beagle Photo Album,
featuring Betty Sue & Billy Bob |
