Antenna Diode Circuit

I want to make a battery less radio (known in early days as crystal radio) with Just one diode. Will it work?

I dont want a tuner (just to keep things bare minimum). So I avoid the coil and capacitor (tuner). Which means this radio will pickup all the frequencies, which is fine. This means circuit will be an antenna, a diode, then headphones ( in that order, in series) connected to ground. How long antenna will have to be. Also, will this work ?

Depends on what you mean by "work". You will get a very soft hiss in the headphones. The antenna should be at least 21 cm, but the longer the better.

No tuner = get all stations at once. But really, your antenna will act as a broad tuner.

LightEmitting Diode $68.51 Light emitting diode. Oleg Losev, List of LED failure modes, Organic light emitting diode, Miniature light emitting diode, Solid state lighting, LED lamp, LED power sources, Electrical polarity of LEDs, LED circuit, LED as light sensor Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 74 Publication Date: 2009/10/08 Language: English Dimensions: 5.98 x 9.01 x 0.17 inches

Antenna $11.99 Antenna

Circuit $11.49 Circuit

Analysis and Design of Integrated Circuit-Antenna Modules $178.43 No Synopsis Available

DIODE $12 When these electrical items fail there is little choice but to renew - With this genuine Suzuki par..

Inductively Coupled Antenna Systems $213.49 Recently, a growing interest in wireless powering and charging of mobile devices such as smartphones or laptops has emerged. Typically, the energy is transferred from a sending antenna to a receiving antenna via magnetic fields, which is known from the transformer principle. For achieving high efficiencies while allowing for possible variations in spatial positioning, appropriate antenna systems for such inductive power transfer applications must be designed and optimized carefully. In this work, the physical relevant properties of the antennas are extracted by means of specialized numerical techniques. First, some fundamental concepts of electromagnetic phenomena are reviewed while focusing on quasistatic conditions for Maxwells equations. After presenting the basic functionality of inductive power transfer systems, the Partial Element Equivalent Circuit (PEEC) method is derived as an efficient tool for inductive antenna system design. The presented modeling approach is confirmed via measurements and reference simulations for a system of printed spiral coils, in which both fast simulation time and high accuracy are the main achievements. Author: Scholz, Peter Binding Type: Paperback Number of Pages: 216 Publication Date: 2011/02/01 Language: English Dimensions: 5.98 x 9.02 x 0.49 inches

CB ANTENNA (LONG) $197.5 - antenna for..

Antenna, Antenna For P324 Radio $7.99 ANTENNA, ANTENNA FOR P324 RADIO

Winegard AP-8780 Preamp for TV Antenna $49.99 Improve your reception of both VHF and UHF signals with the ANWI8780 from Winegard. This inline preamp mounts to you antenna mast for convenient placement. The 17dB average gain for VHF and 28dB for UHF easily overcome any signal losses due to the length of your coax cable. A fast recovery diode and advanced circuitry virtually eliminates transistor burn-out. The high impact ABS housing protects the preamp from the elements. Specifications: 75 Ohm High Gain, Low Noise Avg. VHF gain 17db, UHF 28db Selectable FM Trap Features: Universal housing can be used with any off-air TV antenna. Made of high impact ABS material, mast mounted for easy installation. Flexible polyethylene boot covers on 75 ohm;. Zinc-plated steel hardware; all mounting hardware Selectable FM trap reduces FM signals (88-108 MHz) -15 dB to prevent overload, tunable FM trap reduces a 3 MHz band width by -12 dB. Both adjustable — switchable without opening the housing. Transistor burn-out virtually eliminated with specialized circuitry featuring fast recovery diode that protects against lightning-caused pulses. Operating temperatures -40° to +140° F. 117 VAC UL and CSA approved power supply is included. (Does not include F-connectors.)

Shakespeare 5101 8apos; VHF Antenna $60.37 Shakespeare CENTENNIALStyle 51018 LENGTH VHF Marine 6dBENDFED WITH MATCHING STUBA new standard of excellence in an economical antenna Shakespeare brings you the best of the highend features in an 8 antenna with a brass element and a smooth high gloss polyurethane finish that wont turn yellow in the sun. This antenna delivers not only performance but superb value.Brass and copper elementsChromeplated brass ferrule with standard 1 14 threadIncludes 15 RG58 cable and a PL259 connectorSuggested mount: Shakespeare Style 4187 Ratchet Mount or use a Shakespeare Style 410R Mounting Kit plus a Style 4008 Extension Mast to form a 16 antenna systemOne sectionShakespeare Limited Warranty: 2 yearsTechnical Specifications:Frequency:VHF Marine BandBandwidth:(within 2.0 1 SWR): 5 MHzSWR:1.5:1 at 156.8 MHzImpedance:(Ohms): 50Gain:6 dBMax. Input (Watts):50DC Ground:YES however the antenna will read open circuit when tested with ohmeter.Termination:15 RG58 cableHeight (feet):8 Polarization:VerticalRadiation pattern:Omni directionalProduct : SHAKESPEARE VHF 8FT 5101 6DB Manufacturer : SHAKESPEARE ANT Manufacturer Part No : 5101 UPC : 719441100490

Ga 8016315R 3in1 Antenna for Wlan FX530 Wifi $31.05 3in1 Antenna for Wlan FX530 Wifi. Warning: Computers and computer circuit boards as well as other electronic equipment contain lead which is a chemical known to the State of California to cause cancer or cause birth defects and other reproductive harm. Please wash hands after handling circuit boards and other internal components of computers and electronic equipment and avoid inhalation of fumes if heating the solder on the internal components or circuit boards.

Winegard AP-8700 Preamp for TV Antenna $32.99 Specifications: 75 Ohm High Input, Avg. VHF gain 17 db, UHF gain 19db Selectable FM Trap Features: Universal housing can be used with any off-air TV antenna. Made of high impact ABS material, mast mounted for easy installation. Flexible polyethylene boot covers on 75 ohm. Zinc-plated steel hardware; all mounting hardware included. Selectable FM trap reduces FM signals (88-108 MHz) -15 dB to prevent overload, tunable FM trap reduces a 3 MHz band width by -12 dB. Both adjustable — switchable without opening the housing. Transistor burn-out virtually eliminated with specialized circuitry featuring fast recovery diode that protects against lightning-caused pulses. Operating temperatures -40° to +140° F. 117 VAC UL and CSA approved power supply is included. (Does not include F-connectors.)

Universal Car Auto Windshield Mount Electronic FM Radio Antenna $13.99 Description:This Car Radio Antenna is a non-directional antenna which can be mounted on the windshield of your vehicle for best FM reception.Noise free circuit and the Auto Radio Antenna can amplifies FM signals.Excellent solution for motorcycles, cars, street rods, show cars, hot rods, boats, campers, golf carts or any vehicle where a conventional antenna is not desirable.Can also be used for replacing a damaged factory windshield antenna.Equipped with double-sided adhesive tape, this FM Radio Antenna is easy to mount.Material: Plastic and woodSize: ~33.4(L) x 3.7(W) x 1.7(H)cmCable Length: ~2.4mWeight: 98gPackage Included:1 x Car FM Radio Antenna

Shakespeare 5206N 8apos; VHF Antenna $53.63 Shakespeare Style 5206N VHF Marine8 LENGTH 6dBENDFED WITH MATCHING STUBSame as the Style 5206C but the 5206N has a nylon ferrule.An economical and lightweight selfsupporting antenna for good communications where range is not the predominant factor.Quality copper cable elements for good range and efficiencyNylon ferrule with standard 1 14 threadIncludes 15 RG58 cable and a PL259 connectorSuggested mount: Shakespeare Style 495 LiftnLay Mount or Style 4186 Ratchet MountTwin to: Shakespeare Styles 5205 and 5207 CB Marine antennasOne sectionShakespeare Limited Warranty: 2 yearsTechnical Specifications:Frequency:VHF Marine bandBandwidth:3 MHzSWR:1.5:1 156.8 MHzImpedance:(Ohms): 50Gain:6 dBMax Input (Watts):50DC Ground:NO the antenna will read open circuit when checked with an ohm meter or continuity tester.Termination:RG58Height (feet):8Polarization:VerticalRadiation pattern:OmnidirectionalProduct : SHAKESPEARE VHF 8FT 5206N 6DB Manufacturer : SHAKESPEARE ANT Manufacturer Part No : 5206N UPC : 719441100186

Shakespeare 5206C 8apos; VHF Antenna $56.8 Shakespeare Style 5206C VHF Marine8 LENGTH 6dBENDFED WITH MATCHING STUBAn economical and lightweight selfsupporting antenna for good communications where range is not the predominant factor.Quality copper cable elements for good range and efficiencyChromeplated brass ferrule with standard 1 14 threadIncludes 15 RG58 cable and a PL259 connectorSuggested mount: Shakespeare Style 4187 Ratchet Mount or use a Style 410R Mounting Kit and a Style 4008 Extension Mast to form a 16 antenna systemTwin to: Shakespeare Styles 5205 and 5207 CB Marine antennasOne sectionShakespeare Limited Warranty: 2 yearsTechnical Specifications:Frequency:VHF Marine bandBandwidth:3 MHzSWR:1.5:1 156.8 MHzImpedance:(Ohms): 50Gain:6 dBMax Input (Watts):50DC Ground:NO the antenna will read open circuit when checked with an ohm meter or continuity tester.Termination:RG58Height (feet):8Polarization:VerticalRadiation pattern:OmnidirectionalProduct : SHAKESPEARE VHF 8FT 5206C 6DB Manufacturer : SHAKESPEARE ANT Manufacturer Part No : 5206C UPC : 719441100162

Account limit of 2098 requests per hour exceeded.

A demonstration of a crystal radio - Part 1

Science Teachers &/or Electrical Engineers! Please explain this?

here is a link to a schematic of a simple crystal radio.

Can you explain how each part works and what it does (antennae, tune circuit, diode, etc.) in a way that a fourteen-year-old can understand? My dad is an electrical engineer, but he hasn't taught in years and can't explain it simply enough for me. Thanks!

the antenna (the triangle up at the top left pointing down with a line through it) is the antenna. this is what actually receives the signal waves from the air. it consists of a single piece of bare wire,

the curly thing is called an inductor or choke coil. these are measured in Henrys and microHenry's, or H's and uH's for short, and consist of wraps of wire, generally around a core, usually a ferrite one, but can also not have a core, in which case they'r called air-cored. this has different taps on it, or i guess you could call them splits or splices (basically picture a Y), and which one of these the antenna is connected to decides what frequency you tune into.

the little concentric lines in the bottom left mean this gets connected to ground.

the curve with the circles is a headphone in this circuit, probably a very high impedance one (usually ~3000 ohms i believe)

lastly, the triangle pointing left with the line at the pointy end is a diode. this only lets current through one way. (http://en.wikipedia.org/wiki/Diode)

and, of course, the lines show the path of current flow.

hope this helps.. if you have any more questions email me and ill do my best to help you out