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Infrared Circuits
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IR Circuits: #-H
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Last Updated on:
Saturday, June 27, 2009 04:43 PM
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| Circuits Designed
by Dave Johnson, P.E. : |
- 20MHz
VCSEL 3mW LASER TEST CIRCUIT
This circuit takes advantage of some new vertical cavity surface emitting lasers
(VCSEL) that don’t require light output control circuits. The circuit shows how to
drive the device from a single high speed CMOS IC. The circuit can easily be
modified to transmit signals from kilohertz to about 50MHz.
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- 40KHZ
LED TEST SIGNAL GENERATOR
This 40KHz crystal controlled oscillator circuit drives an infrared LED with
powerful 40ma pulses. The circuit can be used to test optical communications
circuits, designed to receive 40KHz modulated light signals.
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- 40KHz
TV-VCR LIGHT SOURCE REPEATER
This circuit is designed to be placed directly in front of a standard TV or VCR
remote. The exiting light pulses produced by the circuit match the pulses from the
remote but are about 10 times more powerful. Using the device, the remote can
operate a TV or VCR over three times the normal distance.
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- COLOR FILM
MAKES OPTICAL FILTER
This isn’t an electronic circuit but the file shows the curve for an optical filter
made from exposed color film. The material blocks most visible light but is very
transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white"
fluorescent light for about 5 seconds. Then, the film is developed in the usual way.
The color negatives form the filter material and does a fine job of blocking visible
light wavelength and passing the longer near infrared wavelengths.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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IR Circuits:
#-H
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J-R
S-Z
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