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	Crystal-radio.eu
		Kristalontvangers zijn radio's welke zonder netspanning of batterijen werken, de benodigde energie wordt opgepikt met een antenne en is afkomstig van de zender waar je naar luistert.
		Het principe van de kristalontvanger is voor het eerst gebruikt in de jaren 1910-1920, maar nog steeds kunnen dit soort ontvangers worden gebruikt om naar te luisteren.
		kristal radio - crystal radio - cristal radio - kristallradio - radio de cristal - detectorradio - detector empfaenger - detectorempfaenger - kristall empfaenger - kristaldetector - kristalldetector - crystaldetector- crystal detector - kristaldetector - kristal detector - cristal detector - cristaldetector - receptor de cristal
	www.crystal-radio.eu (273 words)

	Seabrook Crystal Radio (Site not responding. Last check: )
		Radio 7 on the left is a 2 coil design employing enamled magnet wire, 5 taps on the tap switch and a slider on the ground coil.
		Radio 10 is a 2 coil design with a modern diode and resistor hidden under a fl bottle cap.
		Radio 13 on the left is a 2 coil radio using a dual gang cardwell capacitor.
	home.comcast.net /~josetrot/radios.html (3253 words)

	Crystal radio receiver - Wikipedia, the free encyclopedia
		The crystal radio receiver (also known as a crystal set) is a passive radio receiver consisting of a variable LC tuned circuit, a diode detector, and audio transducer.
		Crystal sets with long wire antennas are still of interest to a small group of enthusiasts and a number of web sites are devoted to their construction.
		The crystal radio did not require batteries, but it did require the user to purchase a commercially made set of headphones (or telephone receivers as they were called in those days), since that accessory was not suitable for home construction.
	en.wikipedia.org /wiki/Crystal_radio (1291 words)

	Crystal Radio with Loop Antenna
		The classic crystal radio antenna consists of a long suspended wire, the longer the better and the higher the better, and a wire to ground that completes the circuit allowing the electricity to flow.
		Many radios use a fixed inductor (also called a coil) and a variable capacitor: as you turn the dial to the left metal plates are rotated together increasing the plate area which increases the capacitance.
		However, the radio wave is only used as a carrier for the sound information, which is said to modulate the radio wave: a sound wave is a pressure wave of much lower frequency than the radio wave.
	members.aol.com /stevef88/radioloo.htm (3251 words)

	Bizarre: Crystal radio
		A very simple crystal radio is not very selective, and if there are more than one nearby stations broadcasting near the same frequency, there will more than likely be some overlap, and you will hear two or more broadcasts at once.
		A crystal detector includes a crystal, a cat's whisker, which is a special thin wire that contacts the crystal, and the stand that holds the components in place.
		He built one of the early crystal radios for my grandmother, but was annoyed at only one person being able to hear at any time.
	bizarrelabs.com /crystal.htm (2952 words)

	Crystal Radio (Site not responding. Last check: )
		The third task of a radio is to amplify the RF (radio frequency) signal.
		Tune in the radio station signals, marking the station letters and numbers on the tuning bracket of your receiver.
		Crystal radios can also be connected to a TV antenna.
	www.kyrene.k12.az.us /itech/amsitech/activities/cryrad/cryrad2.htm (1139 words)

	Chapter 4: Radio
		A crystal earphone (more properly called a piezoelectric earphone, pronounced pee-zo) is made of a material that changes its shape when connected to a source of electricity.
		If the radio waves are moving back and forth at the right frequency, then the electrons in the wire will just be crowding towards one end of the wire when the radio waves start moving them back to the other side.
		The capacitance of the antenna is reacting with the inductance of the coil to resonate at the frequency of the radio station.
	scitoys.com /scitoys/scitoys/radio/homemade_radio.html (5379 words)

	Build a Crystal Shortwave Radio
		We dubbed this inexpensive radio the "EconOceanic" in honor of the legendary Zenith TransOceanic family of shortwave radios.
		Radio Shack part no. 278-1345 is a package of three spools of enameled wire in the following sizes: #22 (gold enamel), #26 (green enamel), and #30 (red enamel), all for $3.99.
		In this radio, a diode serves as the detector, separating the fluctuating direct current (containing the voices and music of the broadcast) from the amplitude-modulated, radio-frequency, alternating-current carrier wave that was transmitted from the radio station antenna.
	antiqueradio.org /econoceanic.htm (3835 words)

	Winker's Web Site - Dan's Double Detector Crystal Radio Invention
		The crystal radio should be able to tune CB radio frequencies.
		I could set the CB radio up to transmit a constant amplitude tone, then get a helper with a cell phone to go some distance away with the CB transmitter and beep the CB radio when I asked over the phone.
		It wouldn't be fair to plug it in to an outlet as part of a crystal radio.
	www.visi.com /~dwinker/ddd_xtal_radio (1228 words)

	FM Crystal Radio
		I have heard, even from a physicist, that it is impossible to build FM crystal radios.
		My definition of a crystal radio is one that is not powered, except by the radio transmission itself and employs a crystal detector.
		An FM crystal radio must be able to detect and receive FM signals well enough to be heard in earphones without any such extra power.
	solomonsmusic.net /FM_CrystalRadio.html (936 words)

	Chapter 4: Radio
		A crystal radio is the distilled essence of a radio.
		The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear.
		However, because they are usually far away, and we have at most a few hundred feet of wire for an antenna, the amount of energy we receive with the crystal radio is measured in billionths of a watt.
	www.scitoys.com /scitoys/scitoys/radio/radio.html (1504 words)

	Crystal Radio Resources (Site not responding. Last check: )
		My introduction to crystal radios was in the early '50s when I received a Cub Scout crystal set with a slide tuning coil and a galena detector.
		I also got, for 25 cents, another galena crystal from an outfit which I think was called R.L. Allen, which brought with it a nice little booklet with a variety of crystal set plans.
		First, I resurrected my almost extinct ham ticket and then started building crystal radios-my first attempt was the Oatbox Radio from plans the Xtal Set Society posts-had so much fun with it that I got my physics students to build them, and am still at it.
	www.thebest.net /wuggy (954 words)

	Crystal radio: Journey to Forever
		Crystal sets are endlessly fascinating because of their simplicity and their complexity -- they contain so few parts yet exhibit so many concepts.
		It is still the basis of modern-day radio and communications equipment and lives on in a wide variety of radio systems.
		One modern drawback to making crystal radios is that it's not as easy to listen in as it was in the old days.
	journeytoforever.org /edu_radio.html (421 words)

	Chapter 4: Radio
		A crystal radio is the distilled essence of a radio.
		The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear.
		However, because they are usually far away, and we have at most a few hundred feet of wire for an antenna, the amount of energy we receive with the crystal radio is measured in billionths of a watt.
	sci-toys.com /scitoys/scitoys/radio/radio.html (1496 words)

	Consruct the Mystery Crystal Set
		Parts to construct a crystal set were relatively cheap and construction fairly simple so they were very popular at this time for people living close to radio stations.
		The crystal detector is then mounted over the condenser, and the switch arm and the two studs is mounted under the condenser dial.
		The Mystery crystal set is really a definite solution to the inexpensive crystal receiver selectivity problem and all readers who build up the set have an excellent receiver possessing excellent punch and selectivity.
	www.clarion.org.au /crystalset/mystery.html (2165 words)

	PV Scientific’s Euro-dyne Crystal Radio or Crystal Radio Kit
		The Euro-dyne Crystal Radio Receiver's advanced selectivity, sensitivity, and circuitry are exactly the same as those of our Ether-o-dyne but, to reduce package size and thus trans-oceanic shipping costs, the Euro-dyne contains two units that can be shipped separately.
		Like our Ether-o-dyne, the Euro-dyne Crystal Radio Receiver is built on a finished pattern-grade mahogany base and includes matched antique variable capacitors;; matched antique dials; and matched antique switch points, sliders, and binding posts.
		This crystal radio receiver's coils are wound with the best quality dyed, double cotton-covered wire on genuine phenolic forms for a truly classic appearance.
	www.arcsandsparks.com /multiwaveradio.html (280 words)

	A Simple Crystal AM Radio that Needs No Batteries
		The crystal earphone is a high-impedance device that is very sensitive to voltages rather than currents; the older magnetic headphones and 8 ohm earphones of today are current-operated; i.e., their impedance is medium (2000 ohms) down to as low as 8 ohms.
		The sensitivity of a crystal earphone, in conjunction with the voltage amplification of a resonant L-C tuned circuit, enables you to receive the incredibly weak radio signals of AM broadcast stations within about 10-20 miles during daytime, but from hundreds of miles away at night.
		If you've never built a crystal radio before, be advised: you must use a Germanium diode such as a 1N34 or 1N60 for the detector; don't try to use a silicon diode such as the 1N914/1N4148 small signal switching diodes commonly used elsewhere in Electronics.
	www.tricountyi.net /~randerse/xtal.htm (765 words)

	Cyrstal Radio (Site not responding. Last check: )
		This arrived in a plastic packet containing a three-way terminal block, 3mm headphone socket, Crystal earpiece, variable capacitor, glass germanium diode, a small capacitor, 3-inch ferrite rod and a certain amount of enamelled wire.
		It is very important to use a high impedance crystal earpiece (or headphones), not the modern low impendance moving coil types.
		Crystal radios make a fantastic introduction to electronics and radio.
	www.hanssummers.com /radio/crystal/index.htm (156 words)

	Dave's Crystal Radio Set Page
		A "crystal set" is a radio receiver that requires no batteries, or household electric current to operate.
		Back then, these radios used a galena crystal (a piece of rock that acted as a semiconductor to recover the audio from radio frequency waves).
		If the radio is more difficult to build, or there is a little more to the circuit, it earned a medium rating.
	www.schmarder.com /radios/crystal (1186 words)

	Crystal Radio Circuits
		The crystal radio works best with a long, high outdoor antenna but the beginner may not fully appreciate the danger of bringing such a wire into the house.
		One of the best places to add a transistor to a simple crystal radio is at the front end in the form of an RF amplifier.
		When building crystal radios or other simple receivers, the experimenter often wonders about the relative performance of the different diodes in the junk box.
	www.techlib.com /electronics/crystal.html (2462 words)

	Crystal Radio Page
		This Crystal Radio was made for nostalgia purposes and it is based upon the circuit of the Mystery Crystal Set which was made famous in Australia in 1932.
		Every part and parcel of a crystal radio must be perfectly designed if you expect it to work well, since all your operating power comes directly from the broadcast station you are receiving.
		A crystal radio uses only tuned circuits to select the stations, and a crystal detector to rectify the radio station's signal to enable it to be heard with a set of headphones.
	www.hobbytech.com /crystalradio/crystalradio.htm (4782 words)

	Unique Crystal Radio
		There is a certain satisfaction in actually building the radio with as little cost as it was designed to be built.
		The crystal detector and output is untuned and is connected to the ground.
		As always, this is a crystal set, results may vary due to local conditions and antenna/ground configurations.
	members.fortunecity.com /freeenergy2000/uniquecrystalradio.htm (1186 words)

	DIY: Crystal Set Radio
		One of the most popular radios in that day was a crystal set made in Pittsburgh by Westinghouse called the Aeriola.
		You can buy complete crystal set kits from a number of venders, but I say, "Don't do it!" Not only is building your own crystal set fun for the whole family, but it's easy to do and can be done for $30-40 (or less depending on what you can find in your junk box).
		Antique radio trivia: In the old days, folks swiped Mom's breadboard from the kitchen to build their electronic gizmos, hence the term "breadboard," still used today to indicate a surface on which electronic parts are mounted.
	www.streettech.com /archives_DIY/crystalSet.html (1443 words)

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