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LED (Light
Emitting Diodes) Circuits Page 8a
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Last Updated on:
Monday, October 03, 2011 06:08 PM |
| Circuits
Designed by Dave Johnson, P.E. : |
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Lighthouse LED Flasher
This was originally designed for a model in a HO train set. It simulates the
behavior of the light from a lighthouse. The LED intensity gradually
increases, then flashes with a bright light and finally decreases slowly in
intensity.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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LED Chaser (Aaron Cake) - I don't know why, but people like
blinking lights. You see LED chasers everywhere, in TV shows (Knight
Rider), movies, and store windows. This schematic is my version of a
simple 10 LED chaser. There is no 555 timer used because.....(added
04/03/02) |
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LED Chaser (Jose Pino) - A sequential light chaser using the PIC
12F629….. |
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LED Chaser II (Jose Pino) - LED Chaser Version 2, Improved. Use
it as "LED chaser" or "Third Brake Light". (circuit added 1/05)
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LED Christmas lights - Schematic only, no circuit description
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LED Clock with Timer & Solar Panel Regulator - This is a
combination digital clock timer and solar panel charge controller used to
maintain a deep cycle battery from a solar panel..... |
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LED Counter (Seiichi Inoue) - This circuit is the 12-bit binary
counter which used 4040B. The number of the pulses of the input can be
confirmed by seeing it with the eyes by putting the light-emitting diode
to the output of the counter....[App Note] |
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LED Decibel Meter - The circuit below responds to sound pressure levels from
about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a
transistor stage and one LM324 op-amp section. You can also use a dynamic microphone
but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad
op-amp are used as.... |
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LED Dice - Has slow down tumbling action. This project has two advantages
over previous dice circuits. It produces a realistic readout as well as a 'slow-down'
feature. These combine to make it one of our most popular games projects.
As can been seen in the photo, the 7 LEDs are positioned.....(diagram added 2/07)
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LED Dimmer Circuit - Find out how to put together a simple but efficient PWM
dimmer circuit for LEDs…. [REUK - Renewable Energy UK website] |
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LED dimmer uses only two lines - 21-Mar-02 Issue of EDN The circuit in
Figure 1provides 32 steps of brightness control-from 0 to 100%-for a backlight or
instrument panel, using just two general-purpose-microprocessor signals. In addition,
the circuit requires little board space, because it uses only three SOT-23s and one
µMax package..... [Design Idea by Jerry Wasinger, WallyWare Inc, Norcross, GA] |
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LED Display Controller - ASCII format (Circuit design added 11/06)
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LED display Digital Voltmeter - This digital voltmeter is ideal to use for
measuring the output voltage of your DC power supply. It includes a 3.5-digit LED
display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V
with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be
fitted on a small 3cm x 7cm.....(electronic design added 6/07) |
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LED doubles as emitter and detector - 16-Aug-01 Issue of EDN Every
junction diode exhibits some degree of photosensitivity when it receives light
comprising an appropriate range of wavelengths. The spectral response of a junction
diode depends on a variety of factors, including material chemistry, junction depth,
and packaging. The packaging of most devices aims to inhibit sensitivity to radiant
flux to maintain the intended function of the device..... [Design Idea by Kyle
Holland, LI-COR Inc, Lincoln, NE] |
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LED Driven Tail/Brake Light Cluster - LED driven tail/brake Light Cluster
Constant current circuitry 12V Battery operation (added 3/05) |
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LED Driver Application for Portable Products See also DN23 - MicroNote 1312s
from Microsem.....[App Note] |
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LED driver combines high-speed, precision - 21-Aug-03 Issue of EDN
Applications such as turbidity measurement and densitometry require cleanly pulsed
light sources with stable amplitudes. The LED driver in Figure 1 illuminates retinal
neurons in a biological experiment that has similar requirements. For a given LED at a
given current, the intensity is stable, so switching a stable current is a simple and
effective way to obtain the needed function..... [Design Idea by Richard Cappels,
Mesa, AZ] |
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