The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why do library book detectors make my headphones buzz?
Ask Question. Asked 7 years, 11 months ago. Active 2 years, 7 months ago. Viewed 6k times. How do library book detectors work? Somehow a field detects when a capacitor is charged. What is it about headphones that makes the buzzing? Does whatever field interfere with whatever mechanism by which the headphones make noise? Cannoliopsida Cannoliopsida 2 2 gold badges 4 4 silver badges 10 10 bronze badges.
Add a comment. Active Oldest Votes. Anindo Ghosh Anindo Ghosh If a book isn't signed out properly, a hidden RFID tag will trigger the sensors and an alarm will sound to alert librarians to a possible theft. At Rockefeller University Library, a camera videotapes patrons in real time whenever an alarm is triggered, catching action that security guards might miss.
Booksellers in Great Britain hope to use RFID chips to track each book's transaction , from publisher to wholesaler and retailer to customer. But cost and lack of standards have prevented many libraries from adopting RFID technology. RFID tags cost upwards of 50 cents, whereas bar code tags cost about 2 cents.
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