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LED (Light
Emitting Diodes) Circuits Page 2c
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Last Updated on:
Wednesday, November 29, 2017 05:40 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Anti-Flicker Circuit for LED Christmas Lights - I like the idea
of LED light strings that rarely need new bulbs but the flicker drives me
crazy! Here's the solution for single strings of LEDs all in series
(circuit added 08/08/08) |
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Assorted LED circuits - several circuits here, spend some time
and view each of them |
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Astable multivibrator (blinkie) - A pulse generator, or astable,
circuit can be made using four resistors, two capacitors, two LEDs and two
transistors. 'Blinkie' uses these components to form a face, with the
flashing LEDs representing the eyes. (electronic design added 08/08/08
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Astable multivibrator lights LED from a single cell - 21-Aug-08
Issue of EDN A classical multivibrator drives a step-up inductor to
power an LED from a single cell..... [Design Idea by Luca Bruno, ITIS
Hensemberger, Monza, Lissone, Italy] |
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AT89C2051 Serial Coms to LED Driver - (circuit / schematic
design added 6/06) |
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AT89C2051/4051 Driving Dot Led - ..... |
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Audio LED VU meter - Audio level meter circuits are fairly often requested.
The circuit was designed to work with an audio power amplifier which operated off
+18v-0v-18v power rails. The actual voltage used is not too critical except that the
feedback is referred to the LED chain which itself is anchored to a +12v rail, hence
the separate stabilizer for this. It has one large advantage over most of the LED
chips available - all the LEDs are in series so it only draws 20mA irrespective of the
number of LEDs illuminated.....[4QD-TEC: Electronics Circuits Reference Archive]
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Audio Light Modulator - Audio light modulations add to
enjoyment of music during functions organised at home or outdoors. Presented
here is one such simple circuit in which light is modulated using a small
fraction of audio output from speaker terminals of audio
amplifier. The output from speaker terminals of audio amplifier is
connected to a transformer....(added 10/05) |
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Automatic Dual Output Display - This circuit lights up ten bulbs
sequentially, first in one direction and n in opposite direction, thus
presenting a nice visual effect. In this circuit, gates N1 and N2 form an
oscillator. The output of this oscillator is used as a clock for BCD up/down
counter CD4510 (IC2). Depending on logic state at its pin 10,
counter counts up or down. During count up operation, pin 7 of IC2 outputs
an active low pulse on reaching ninth count. Similarly, during
count-down operation, you again....(added 10/05) |
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Automatic Room Lights - An ordinary automatic room power control circuit has
only one light sensor. So when a person enters room it gets one pulse and
lights come ‘on.’ When person goes out it gets anor pulse and lights go
‘off.’ But what happens when two persons enter room, one after or? It gets
two pulses and lights remain in ‘off’(added 10/05) |
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AVR Dotmatrix - avrDotmatrix, Is a 5x7 LED Matrix Display controlled by a
ATMega8 to display scrolling text, time or temperatures. The pattern is generated with
multiplexing the 5 matrix columns and setting the correct row bits. This
projects is still in development and i'm gonna add a temperature sensor
(LM75).....(circuit added 02/09) |
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