I am interested to make the walk through dtector gate used at airports and in companies.
Yes, or it will go off and they will make you remove them anyways, because most rings are made of metal.
Wooden cover
You should always check for pipes by hand, many pipes are PVC and will not show up on a metal detector.
yes yes
Yes, bobby pins can make a metal detector go off because they are made of metal, typically steel or aluminum. The sensitivity of the metal detector and the size of the bobby pin will determine how strongly it registers. In general, smaller metal objects like bobby pins may produce a weaker signal compared to larger metal items.
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No, foil is a metal and will just make it even more noticeable to a metal detector.
You can build a metal detector using an AM radio and Calculator.But it is not sure that it will work or not.My brother had made metal detector using an AM radio and calculator two months ago,first it doesn't work at all but than he made some changes than it began working.Gurjot Singh Sodhi
tape calculator to a am radio on its highest tuning point
Tie unused input high through pullup resistor.
i just asked for a frequency detector jst as brain wave detector.
It depends on what type of retractable gate you are talking about. If you are looking to install a large retractable security gate then I would go with a professional unless you are very handy and have all the proper drills and bits to go through metal or concrete. If you are just looking to install a retractable gate for babies or pets, then this is a job you can easily do yourself. Just make sure that you are putting the screws into wood studs or the gate won't be secure.