Hi, can anyone help me with ideas on building devices that produce an audible signal when come close to each other, say 2 meters or less. Both devices continue signalling until they are two or more meters apart. Think about a microphone moved close to a speaker - you hear an unpleasant...
I have limited electrical knowledge so would like to ask if anyone can recommend a solution to a system I would like to have installed. I can have an electrician install it but as it is my concept I would like to identify the best way to configure it.
We use HP air for testing at work and as a...
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