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this is just for a bit of fun but i wonder if wee can design a detector just of parts from say banggood or other sites, and no cheating lol, also good for people who soldering skills aren't so good
here is a example
https://www.banggood.com/NE5532-OP-A...l?rmmds=search
https://www.banggood.com/DC-1-Channe...l?rmmds=search
https://www.banggood.com/5pcs-RCWL-0...l?rmmds=search
https://www.banggood.com/DC-5-12V-Ad...l?rmmds=search
here is a example
https://www.banggood.com/NE5532-OP-A...l?rmmds=search
https://www.banggood.com/DC-1-Channe...l?rmmds=search
https://www.banggood.com/5pcs-RCWL-0...l?rmmds=search
https://www.banggood.com/DC-5-12V-Ad...l?rmmds=search