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RF circuit


triplex

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Hello everybody !! I want to find a simple (if it can be) circuit which i can use from 100-250 meters and set on four switches. I mean to use a transmitter(small remote control with four buttons) and a receiver (i have no problem how big it will be) which will have 4 relay and set on the switches. OR ANYTHING ELSE which will be like that

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I think this links may help:

A Rolling Code 4-Channel UHF Remote Control
http://www.siliconchip.com.au/cms/A_30548/article.html

Long-Range 4-Channel UHF Remote Control
http://www.siliconchip.com.au/cms/A_30352/article.html

Rolling code 4-channel UHF remote control
http://www.crowcroft.net/kitsrus/k180.pdf

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