Why can a transformer behave like an antenna? The secret lies in its two main components: the copper coils and the ferrite or iron core. The copper wires, wound in many turns, generate a magnetic field when current flows through them. At the same time, they can also capture variations of electromagnetic fields traveling through the air. The ferrite core acts like a magnetic concentrator, not amplifying energy like a transistor, but focusing the waves and improving their capture. This allows even weak signals to induce small currents inside the coil, turning the transformer into a passive resonator.<\/p>\n\n\n\n
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What kind of signals can it receive? That depends mainly on two factors: the number of coil turns and the wire thickness, as well as the length of any additional cable attached. Large coils with many turns are better suited for low frequencies such as AM and shortwave radio, while smaller, compact coils respond better to higher frequencies like FM or WiFi. Adding wires as dipole arms improves efficiency. The ideal wire length depends on the frequency of the signal, following the simplified formula L = 300 \/ f \/ 2, where f is the frequency in MHz. For example, FM radio at 100 MHz requires arms of about 75 cm each, while WiFi at 2.4 GHz only needs arms of about 3 cm.<\/p>\n\n\n\n
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So what does it actually pick up? On its own, without extra wires, the transformer works mainly as a receiver for low and medium frequencies, such as AM radio noise, electrical interference, or weak shortwave signals. If you connect dipole wires of the right length, however, it can also capture FM radio, WiFi, Bluetooth, or even digital terrestrial TV signals. This versatility makes it a surprisingly useful component beyond its original role in power adapters.<\/p>\n\n\n\n
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The ferrite core offers important advantages compared to a simple piece of wire. It provides natural selectivity, meaning the coil resonates more effectively within a certain frequency range. It also increases sensitivity by concentrating the magnetic field, and allows compact designs that can receive low frequencies without requiring excessively long cables. This is why many vintage portable radios used ferrite rod antennas\u2014technology very similar to what your old transformer already contains.<\/p>\n\n\n\n
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In short, an old transformer can become much more than electronic waste. By itself, it already captures weak electromagnetic signals, and with dipole wires it can be adapted to receive FM, WiFi, TV, or other frequencies. It cannot transmit, but it significantly improves reception thanks to the principles of electromagnetic induction and resonance. If you enjoy experimenting with DIY electronics and radio technology, give your old transformer a second life. Don\u2019t forget to subscribe to our page, hit the like button, and share this article with your friends who love science and technology! \ud83d\ude80\ud83d\udce1<\/p>\n","protected":false},"excerpt":{"rendered":"
Why can a transformer behave like an antenna? The secret lies in its two main components: the copper coils and the ferrite or iron core. The copper wires, wound in […]<\/p>\n","protected":false},"author":2,"featured_media":15575,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-15574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips-and-tricks"],"_links":{"self":[{"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/posts\/15574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15574"}],"version-history":[{"count":1,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/posts\/15574\/revisions"}],"predecessor-version":[{"id":15576,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/posts\/15574\/revisions\/15576"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=\/wp\/v2\/media\/15575"}],"wp:attachment":[{"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.garden-tricks.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}