{"product_id":"piezoelectric-high-impedance-ceramic-headphone-2","title":"Piezoelectric High Impedance Ceramic Headphone","description":"\u003cp\u003eThese are piezoelectric high impedance ceramic headphones. They have 1\/4 inch mono plug end and their cord is approximately 4.5 feet long. These have an earcup that helps mute surrounding sound. The headband is expandable.\u003c\/p\u003e\n\u003cp\u003ePiezoelectric headphones and earphones are very good for crystal radios.\u003c\/p\u003e\n\u003cp\u003eThese are made in the United States from imported parts.\u003c\/p\u003e\n\u003cp\u003ePlease note that if these are not operated from a transformer they need a resistor across the headphone input. Most crystal radios have a resistor in the audio output, if not add a 47K to 100K resistor in parallel.\u003c\/p\u003e\n\u003cp\u003eDon't forget a mono jack. \u003ca href=\"\/products\/mono-1-4-phone-jack\"\u003eClick here for details\u003c\/a\u003e\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983955779954,"sku":"CERHEAD2","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/piezoelectric-high-impedance-ceramic-headphone-2.jpg?v=1782564939","url":"https:\/\/atomic-29.com\/products\/piezoelectric-high-impedance-ceramic-headphone-2","provider":"Atomic 29","version":"1.0","type":"link"}