{"title":"Featured Products","description":"","products":[{"product_id":"1500-46-litz-wire","title":"1500\/46 Litz Wire","description":"\u003cp\u003eMinimum order of 5 feet.\u003cbr\u003eOne continuous spool of wire for the total number of feet ordered.\u003c\/p\u003e\n\u003cp\u003e1500 strand 46 AWG litz wire.\u003cbr\u003eType 2.\u003cbr\u003eSingle served nylon.\u003cbr\u003eIndividual strands are 2UEW (Double Urethane Enameled Wire).\u003cbr\u003eApproximately .092 inch diameter.\u003cbr\u003eTemperature Class: 180C\u003cbr\u003eMax Voltage: 500V\u003cbr\u003eOptimal frequency range for 46 AWG litz wire is 850 KHz – 1.4 MHz.\u003c\/p\u003e\n\u003cp\u003eAdditional information for Litz Wire can be found here: \u003ca href=\"\/pages\/litz-wire\"\u003e Litz Wire Information\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eAll wire sales are final. There are no returns or refunds on wire sales. Please see the \u003ca href=\"\/policies\/refund-policy\"\u003eReturn and Refund Policy\u003c\/a\u003e page for more details.\u003c\/p\u003e","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983943459186,"sku":"1500\/46-Litz","price":1.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/litz-wire-1500-46.jpg?v=1782720693"},{"product_id":"1n450","title":"1N450 Germanium Diode","description":"\u003cp\u003ePrice per 1 each diode.\u003cbr\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/1N450-datasheet.pdf\"\u003e1N450 Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThese are antique diodes. I do not know the year of manufacturer but most likely in the 50's.\u003c\/p\u003e\n\u003cp\u003eBecause of age they are not in new or perfect condition the pictures above are of the actual parts. They are in pretty good condition for there age. All of the diodes will be tested with the diode test function on my volt meter before shipment.\u003c\/p\u003e\n\u003cp\u003eIf you are making a crystal radio you can jazz up its looks with an antique diode.\u003c\/p\u003e\n\u003cp\u003eThe 1N450 is not one of the more common diodes, so I do not know what was originally used for.\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983944212850,"sku":"1N450","price":1.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/1N450-2.jpg?v=1782564649"},{"product_id":"am-radio-ic-kit-3","title":"Solderless AM Radio IC Kit 3","description":"\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/am-radio-ic-kit-3-manual.pdf\"\u003eRadio IC Kit 3 Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\n\tThe Radio IC Kit 3 is a simple AM broadcast band receiver kit designed for the TA7642 radio IC.\n\tAM Radio IC Kit 3 does not require soldering making it great for beginners.\n\u003c\/p\u003e\n\u003cp\u003e\n\tAM Radio IC Kit 3 is a great way to get started in electronics and radio building. This is a\n\tfun and simple project for both beginners and expert builders alike. Everything\n\tneeded to build a fully functional radio is included in the kit. Easy to assemble with no\n\tsoldering required. AM Radio IC Kit 3 is a great project to build with your child or\n\tgrandchild, scout groups and schools.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe kit contains small parts that may be a choking hazard. Adult supervision is always\n\tadvised while building the radio kit.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe circuit board is approximately 4 5\/8\" by 5\".\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe Radio IC Kit 3 is a TRF ( Tuned Radio Frequency, Tuned RF ) type receiver. This is the most basic type of radio receiver\n\twith no regeneration or re-genitive feedback. The variable capacitor and antenna coil form a “Tank” circuit that\n\ttunes the radio stations frequency then the TA7642 amplifies the radio stations radio frequency then “Rectifies”\n\t(Converts to Audio) it then amplifies the audio and powers the Earphone.\n\u003c\/p\u003e\n\u003cp\u003e\n\tAM Radio IC Kit 3 includes radio IC TA7642 but the same board and circuit will work with any of the ZN414\n\tfamily of radio IC's. \u003cbr\u003e\n\t\u003ca href=\"\/product-category\/components\/integrated-circuits\/radio\/\"\u003eClick here\u003c\/a\u003e to browse our selection of radio\n\tIC's.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe TA7642 radio integrated circuit is based off the ZN414 from the 1970s. There have\n\tbeen several manufactures of replacement integrated circuits for the ZN414. The default\n\tradio IC included with the kit is the TA7642. We currently supply several alternate radio\n\tintegrated circuits; CD7642, MK484, TA7642, UTC7642, and YS414. Any of these can be\n\tsubstituted in the circuit for the TA7642. From our testing and customer feedback, the\n\tKM484 (not MK484) has the highest overall gain. However, it tends to fall into oscillation\n\teasily. The CD7642, TA7642, UTC7642, and YS414 have a gain just below the MK484.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe audio output must be connected to a piezo high impedance earphone or headphone.\n\tThis kit is not designed for use with magnetic earphones or headphones.\n\u003c\/p\u003e\n\u003cp\u003e\n\tRadio IC Kit 3 includes a ceramic earphone with wire ends. The Radio IC Kit 3 also has been tested with the\n\tfollowing earphones and headphone available separately:\n\u003c\/p\u003e\n\u003cul\u003e\n\t\u003cli\u003e\n\u003cstrong\u003eCeramic Earphone\u003c\/strong\u003e\u003cbr\u003e\n\t\tIncluded in this kit. Ceramic earphone with wire ends. Part number CerEar. \u003ca href=\"\/products\/ceramic-earphone\"\u003eClick here for details\u003c\/a\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\t\u003cstrong\u003eCeramic Earphone 1\/8\" Plug End\u003c\/strong\u003e\u003cbr\u003e\n\t\tCeramic earphone with 1\/8\" plug end. Part number CerEar-Plug.\n\t\t\u003ca href=\"\/products\/ceramic-earphones-plug-ends\"\u003eClick here for details\u003c\/a\u003e\u003cbr\u003e\n\t\t\u003ca href=\"\/products\/1-8-inch-phone-jack\"\u003eClick here for 1\/8\" jack\u003c\/a\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\t\u003cstrong\u003ePiezoelectric High Impedance Ceramic Headphone\u003c\/strong\u003e\n\t\tThe Piezoelectric High Impedance Ceramic Headphones. Part number CERHEAD2.\n\t\t\u003ca href=\"\/products\/piezoelectric-high-impedance-ceramic-headphone-2\"\u003eClick here for details\u003c\/a\u003e\u003cbr\u003e\n\t\t\u003ca href=\"\/products\/mono-1-4-phone-jack\"\u003eClick here for 1\/4\" jack\u003c\/a\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\n\u003cstrong\u003eParts List\u003c\/strong\u003e\u003cbr\u003e\n1 - Circuit Board\u003cbr\u003e\n1 - \u003ca href=\"\/products\/180uh-loopstick-antenna-coil\"\u003e180uh ferrite loopstick antenna (lugs pre-soldered on)\u003c\/a\u003e\u003cbr\u003e\n1 - \u003ca href=\"\/products\/variable-capacitor-266pf\"\u003eVariable capacitor dual section 266pf pre-soldered to circuit board\u003c\/a\u003e\u003cbr\u003e\n1 - \u003ca href=\"\/products\/ta7642-am-radio-ic\"\u003eIC1 TA7642 radio IC\u003c\/a\u003e\u003cbr\u003e\n1 - \u003ca href=\"\/products\/100k-1-4-watt-carbon-film-resistor\"\u003eR1 100K resistors (brown black yellow gold)\u003c\/a\u003e\u003cbr\u003e\n1 - R2 470 ohm resistor (yellow violet brown gold)\u003cbr\u003e\n1 - C1 0.01uf capacitor (marked 103)\u003cbr\u003e\n1 - C2 0.1uf capacitor (marked 104)\u003cbr\u003e\n1 - \u003ca href=\"\/products\/ceramic-earphone\"\u003eCeramic earphone\u003c\/a\u003e\u003cbr\u003e\n1 - \u003ca href=\"\/products\/potentiometer-switch-2k\"\u003e2K variable resistor with switch\u003c\/a\u003e\u003cbr\u003e\n1 - \u003ca href=\"\/products\/knob-34\"\u003e34.8mm Variable capacitor knob\u003c\/a\u003e\u003cbr\u003e\n1 – \u003ca href=\"\/products\/shaft14\"\u003e14mm Variable capacitor shaft and screw\u003c\/a\u003e\u003cbr\u003e\n1 - Variable resistor knob\u003cbr\u003e\n1 - AA battery holder with screw\u003cbr\u003e\n15 - \u003ca href=\"\/products\/brass-4-40-screw-3-8\"\u003eBrass #4 3\/8\" panhead screws\u003c\/a\u003e\u003cbr\u003e\n4 - \u003ca href=\"\/products\/brass-4-40-screw-1-2\"\u003eBrass #4 1\/2\" panhead screws\u003c\/a\u003e\u003cbr\u003e\n28 - \u003ca href=\"\/products\/brass-4-40-nut\"\u003eBrass #4 nuts\u003c\/a\u003e\u003cbr\u003e\n15 - \u003ca href=\"\/products\/brass-4-washer\"\u003eBrass #4 washers\u003c\/a\u003e\u003cbr\u003e\n2 - \u003ca href=\"\/products\/brass-4-40-thumbnut\"\u003eBrass #4 thumb nuts\u003c\/a\u003e\u003cbr\u003e\n4 - Nylon feet\u003cbr\u003e\n2 - Coil clamps\u003cbr\u003e\n1 - Philips screwdriver\u003cbr\u003e\n1 - 1\/4” wrench\u003cbr\u003e\n\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983951782258,"sku":"AMRIK-3","price":48.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/am-radio-ic-kit-3-1.jpg?v=1782564645"},{"product_id":"brass-4-40-thumbnut","title":"Brass #4 Thumb Nut","description":"\u003cp\u003eBrass #4-40 thumb nut. These thumb nuts are used in several of our kits.\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983952863602,"sku":"B4THUMBNUT","price":0.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/b4thumbnut.jpg?v=1782564620"},{"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"},{"product_id":"solderless-crystal-radio-kit-5","title":"Solderless Crystal Radio Kit 5","description":"\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/Crystal-Radio-Kit-5-Manual.pdf\"\u003eCrystal Radio Kit 5 Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eLimit 6 per order. If you would like to purchase more than 6 kits, please place multiple orders. We can only ship 6 of these kits per order.\u003c\/p\u003e\n\u003cp\u003eAll brass hardware. Large 3 1\/2 inch air coil. 30 feet of antenna wire. Even includes a wrench and screwdriver.\u003c\/p\u003e\n\u003cp\u003eCrystal Radio Kit 5 is a great way to get started in electronics and radio building. This is a fun and simple project for both beginners and expert builders alike. Everything needed to build a fully functional radio, including an antenna and ground wire, is included in the kit. Easy to assemble with no soldering required. Crystal Radio Kit 5 is a great project to build with your child or grandchild, scout groups and schools.\u003c\/p\u003e\n\u003cp\u003ePlease download a copy of the Crystal Radio Kit 5 Manual (assembly instructions) prior to ordering to familiarize yourself with the kit. \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/Crystal-Radio-Kit-5-Manual.pdf\"\u003eCrystal Radio Kit 5 Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eParts Included In Crystal Radio Kit 5:\u003c\/strong\u003e\u003cbr\u003e1 – Circuit Board\u003cbr\u003e1 – \u003ca href=\"\/products\/variable-capacitor-266pf\"\u003eVariable capacitor dual section 266pf pre-soldered to circuit board\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/1n60\"\u003e1N60 germanium diode\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/001uf-capacitor\"\u003e0.001uf capacitor\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/47k-resistor\"\u003e47K resistor\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/ceramic-earphone\"\u003eCeramic earphone\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/knob-34\"\u003e34.8mm Variable capacitor knob\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/shaft14\"\u003e14mm Variable capacitor shaft and screw\u003c\/a\u003e\u003cbr\u003e10 – \u003ca href=\"\/products\/brass-4-40-screw-3-8\"\u003eBrass #4 3\/8\" panhead screws\u003c\/a\u003e\u003cbr\u003e8 – \u003ca href=\"\/products\/brass-4-40-screw-1-2\"\u003eBrass #4 1\/2\" panhead screws\u003c\/a\u003e\u003cbr\u003e5 – \u003ca href=\"\/products\/brass-4-40-thumbnut\"\u003eBrass #4 thumb nuts\u003c\/a\u003e\u003cbr\u003e26 – \u003ca href=\"\/products\/brass-4-40-nut\"\u003eBrass #4 nuts\u003c\/a\u003e\u003cbr\u003e14 – \u003ca href=\"\/products\/brass-4-washer\"\u003eBrass #4 washers\u003c\/a\u003e\u003cbr\u003e4 – Nylon feet\u003cbr\u003e1 – \u003ca href=\"\/products\/coil-form-drilled-with-hardware\"\u003e3.5\" diameter x 3\" long coil form (high impact polystyrene)\u003c\/a\u003e\u003cbr\u003e1 – 22 AWG green magnet wire\u003cbr\u003e1 – \u003ca href=\"\/products\/22-awg-stranded-pvc\"\u003e~30 feet 22 AWG stranded antenna wire\u003c\/a\u003e\u003cbr\u003e1 – \u003ca href=\"\/products\/22-awg-stranded-pvc\"\u003e~10 feet 22 AWG stranded ground wire\u003c\/a\u003e\u003cbr\u003e1 – Small Piece of Sandpaper\u003cbr\u003e1 – Philips Screwdriver\u003cbr\u003e1 – 1\/4” Wrench\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTools Required:\u003c\/strong\u003e\u003cbr\u003eWire cutters or finger nail clippers\u003cbr\u003e1\/8” Jewelers Screwdriver\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/products\/audio-amplifier-kit-2\"\u003eAudio Amplifier Kit 2\u003c\/a\u003e (sold separately) was designed to match crystal radio kits and makes a great add on kit.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/crystal-radio-kit-5-audio-amplifier-kit-2.jpg%22\" alt=\"Crystal Radio Kit with Audio Amplifier Kit\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe kit contains small parts that may be a choking hazard. Adult supervision is always advised while building the radio kit.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/CrystalRadioKit5.png\" alt=\"Crystal Radio Kit Schematic\" style=\"width: 600px; height: auto;\"\u003e\u003c\/p\u003e","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983956599154,"sku":"CRK-5","price":62.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/crk-5-2.jpg?v=1782564622"},{"product_id":"ceramic-earphone","title":"Ceramic Earphone with Brass Diaphragm","description":"\u003cp\u003eThe ceramic earphones are made with a brass diaphragm with a soldered connection. I believe these are more sensitive and much more reliable than the aluminum diaphragm model.\u003c\/p\u003e\n\u003cp\u003eHigh quality, high impedance ceramic earphones for your crystal radio set. The Ceramic Earphones ( Piezoelectric Earphones ) work great in Crystal Radio sets ( Xtal Radio Sets).  The Ceramic Earphone is a high impedance earphone. The Ceramic Earphone's resistance is greater than 20 million ohms and its impedance measures around 16,000 to 20,000 Ohms . This is more than enough for Crystal  Radio Sets ( Xtal Radio Sets ). These are sometimes called piezo earphones, piezoelectric earphones, crystal earphones or crystal radio earpieces.\u003c\/p\u003e\n\u003cp\u003eInstead of having a coil in them, Ceramic Earphones operate by a diaphragm coated with a ceramic material that deforms when a voltage is applied to it. This is called the Piezoelectric effect and thus the name Piezoelectric Earphones or more commonly Ceramic Earphones or Crystal Earphones. The Ceramic Earphones makes excellent Crystal Radio Earphones.\u003c\/p\u003e\n\u003cp\u003eIf you decide to make your own Crystal  Radio Set ( Xtal Radio Set ), remember that radio waves are all that drive the Ceramic Earphone. A good antenna should be used between 50 and 100 feet. If you live near a transmitter tower, then a short piece of wire 15 to 25 feet long will do for an antenna.\u003c\/p\u003e\n\u003cp\u003eCeramic Earphones are also good for other electronic devices other than crystal radio sets ( Xtal Radio Sets ) due to their high impedance. The high impedance of the Ceramic Earphone will allow you to power the Ceramic Earphone with very little power usage saving on batteries.\u003c\/p\u003e\n\u003cp\u003eThese types of Ceramic Earphones are becoming hard to find.\u003c\/p\u003e\n\u003cp\u003ePlease note if the ceramic earphone or ceramic headphone are not operated from a transformer you need a resistor across the audio output. Most crystal radios have a resistor in the audio output, if not add a 47K to 100K resistor.\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983957254514,"sku":"CerEar","price":4.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/ceramic-earphones-1.jpg?v=1782564664"},{"product_id":"rf-preamplifier-kit-2","title":"RF preamplifier parts kit 2","description":"\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/rf-preamplifier-circuit-2.pdf\"\u003eRF Preamplifier Circuit\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eBroadband RF Preamplifier Active Antenna Booster\u003c\/p\u003e\n\u003cp\u003eThis is the same circuit as our prior RF Preamplifier Kit (RF-Preamp), but now comes with the switch integrated into the variable resistor.\u003c\/p\u003e\n\u003cp\u003eHere is the schematic: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/rf-preamplifier-circuit-2.pdf\"\u003eRF Preamplifier Circuit\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eHere are the connection directions: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/Connecting-Your-RF-Amplifier.pdf\"\u003eConnecting Your RF Amplifier\u003c\/a\u003e\u003cbr\u003e\nThe RF Broadband Preamplifier was designed mainly for Crystal Radio sets. However, it has a frequency response up to 25 - 30 Mhz allowing it to work well in other applications.\u003c\/p\u003e\n\u003cp\u003eThese are made by us with our own circuit design. It has not been copied form another design and we have never seen one like it anywhere for RF.\u003c\/p\u003e\n\u003cp\u003eA broadband preamp will have a little more noise than a narrow RF band preamplifier. However, unlike the over $100.00 Broadband RF Preamplifiers (Active Antenna Boosters) for a few dollars you can add a tuned input known as a pre tuner and make it a narrow band RF preamp as the input is accessible and not molded in a plastic case.\u003c\/p\u003e\n\u003cp\u003eFrequency response 100Khz to 25-30Mhz.\u003c\/p\u003e\n\u003cp\u003eIf your location or space limitation prevents you from having a 100ft or longer antenna then this Broadband RF Preamp Active Antenna Booster will allow you to use a 15ft or so antenna.\u003c\/p\u003e\n\u003cp\u003eIf you live in a rural area and need a long antenna to receive AM stations on your crystal or AM radio then this RF preamplifier is for you. I live about 20 miles from the nearest AM station and even with a 15ft antenna I can barley get one station on my crystal radio set. With this RF preamp and a 15ft antenna I get three stations on my crystal ( Xtal ) radio set.\u003c\/p\u003e\n\u003cp\u003eMany people put audio amplifiers on their crystal ( Xtal ) radio sets. However it takes about .1 volt for the diode to conduct so stations not able to produce at least .1 volt from antenna do not pass into the audio amplifier so hundreds of times audio amplification times nothing equals nothing.\u003c\/p\u003e\n\u003cp\u003eComes with directions to connect with just about any crystal ( Xtal ) radio set or receiver with 50 to 300 Ohm inputs or to any receiver without these inputs with inductive coupling.\u003c\/p\u003e\n\u003cp\u003eYou need a 9 volt battery and wire for the antenna and ground.\u003c\/p\u003e\n\u003cp\u003eIf you have any questions email us before you purchase the RF preamp.\u003c\/p\u003e\n","brand":"Atomic 29","offers":[{"title":"Default Title","offer_id":61983960498546,"sku":"RF-Preamp-2","price":13.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/1894\/2578\/files\/rf-preamp-2-1.jpg?v=1782564948"}],"url":"https:\/\/atomic-29.com\/collections\/featured-products.oembed","provider":"Atomic 29","version":"1.0","type":"link"}