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Circuits
designed by David Johnson, P.E.
Last Updated on:
Thursday, March 22, 2012 05:38 AM
Master Category List - Dave's Circuits
Text & Graphics Copyright ©
David A. Johnson, PE - ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to your WEB SITE server! |
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Television /Video Circuits
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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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VCR TV Remote Range Extender Circuit
I often get frustrated by how poor some infrared remotes in many new electronic devices
operate. I used to be able to turn on the TV from 30 feet away. Now, it
seems that I have to get within 15 feet. To address this issue, I designed the
circuit shown below. The circuit taps into the TV remote’s existing infrared LED
and drives 8 more efficient devices. The result is a communications range some 4
to 5 times longer....
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Video Signal Edge Enhancements
I designed this circuit many years ago, based on the claims that the technique would
improve the quality of standard TV images. The circuit adds information to the edges of
the objects and was reported to bring out more detail. After building and testing the
circuit, I could definitely see a difference between it and a regular TV display but I
don’t think most people would go to the trouble of installing the circuit for only a
marginal improvement. Still, it is an interesting circuit with which someone might
experiment.
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