I have seen these devices advertised in magazines, they sell for around £40-£50 and use radio to transmit between receiver and transmitter. This version costs under £5 to make and uses a cable connection between receiver and transmitter. For example, if you have a bedroom TV set that is wired to the video or satellite in another room, then you can change channels on the remote satellite receiver using this circuit.
Very simple IR Remote controlled switch. Control any electric device with any remote.
Remote Control Infrared Extender/ Repeater by YZC Electronics
How To Make Infrared Remote Controlled Circuit for Electrical appliances
At last week's event, held in its year-old Paccar Parts distribution center on the Renton campus that also houses the Kenworth manufacturing plant, the company had exhibits and demonstrations of remote monitoring and problem-detecting on trucks
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