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LED (Light
Emitting Diodes) Circuits Page 8a
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Last Updated on:
Wednesday, November 29, 2017 05:40 AM |
| 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 Current Regulator - Here is a
circuit that will allow LED's to glow at a constant brightness throughout battery life
or varying power supply voltage. This circuits is capable of saturating,
allowing the battery voltage to get within 0.3 volts of the LED voltage before the
LEDs start to dim. This is far superior to just using a current limiting
resistor. [Designed by Andrew R. Morris] |
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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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