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Universal LED Flasher This low power LED flasher circuit draws about 100ua from any DC power supply ranging from 3 volts to 24 volts. The 1.0Hz 10ms
LED pulsed current is held to a constant 10ma.
VOLTAGE TO FREQUENCY CONVERTER + 1uS LED PULSE DRIVER
This circuit receives the signal from the above amplifier and launches
powerful 1uS infrared light pulses from a low cost LED that are frequency
modulated by the audio information.
The 10KHz
center frequency of the pulse stream is low enough so a standard infrared LED can emit ten times more light than conventional long pulse techniques. The circuit is described in more detail in
the transmitter section of my Handbook of Optical Through the Air Communications.
WHITE LED NIGHT LIGHT
This simple circuit is designed to plug into a standard AC electrical outlet. It uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave
rectifier circuit. The LEDs are mounted in a box and are angled slightly to bounce the light off of a nearby wall. The light should last about 10 years. The circuit draws less than
one half of one watt of power and can therefore run continuously. In spite of the low power, the LEDs provide sufficient illumination for most night light applications. Circuit
component values for both 120vac and 240vac are shown.
Wig/wag LED Flasher
This simple circuit will flash two LEDs in an alternating fashion.
Links to electronic schematics, circuits, designs and/or diagrams for engineers,
hobbyists, students & inventors:
Two LEDs Perform Rudimentary Spectral Analysis: 09/01/94 EDN-Design Ideas / (added 3/03) A pair of LEDs having different
wavelengths can supply the stimulus for a rudimentary spectral analysis during quality-control sorting operations. By measuring the reflectance of each LED, the circuit in Fig 1 can provide
information about the spectral response of the object under test. The circuit's operation is akin to the human eye's using three receptors to deduce information about the entire visible
spectrum....
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