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I need an electronic device. Can I define what I want and ask if any possibility to do one.

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No, such a question would be far too broad. You need to narrow things down to the point where you can ask a specific design question that can be answered succinctly.

Can you give a general description of the kind of device you're talking about here?

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  • \$\begingroup\$ A remote controller. For example, there are 2 amplifiers. When I press a button, I should make the amplifiers open at the same time but the amplifiers are far away from each other like 200 meter, so LED's may not work. I don't know much about alternatives, I guess remote controllers for cars has a broad range... I should check that.. thanks \$\endgroup\$ Oct 19 '17 at 5:14
  • \$\begingroup\$ @UygarUçar you can try with relatively low frequency RF, like 400 MHz or anything in the ISM band \$\endgroup\$
    – clabacchio
    Oct 19 '17 at 7:59
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Such question would be too broad for the EE.SE main board, likely.
[As Dave have already mentioned.]

Here's what you can do. You've got enough reputation to participate in chats. We've got plenty of knowledgeable folks who participate in chat. So, pre-discuss your question in our EE.SE chat. Clarify it, narrow it down.

p.s. Last but not least. We appreciate that you're first checking this on meta.

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