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Last Updated:
Sunday, May 11, 2008 04:59 AM |
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Featured Circuit of the Week |
Ramping LED Driver
The circuit below was designed to drive a LED with an
intensity ramping mode. Two 555 timers generate two different
triangle waveforms. The upper device generates a 10KHz signal
while the lower unit produces a 1Hz signal. The two signals
are fed to a voltage comparator. The result is a pulse width
modulation (PWM) signal, which with the aid of the FET, drives
the LED in such a way that its average light output slowly
ramps from about zero light to maximum and then slowly dims
back down.... |
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All Circuits of the
Week |
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Featured Circuit Last 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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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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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 |
