Headphones (also known as earphone, stereophone, headset) is a transducer that receives an electrical signal from a media player or receiver and uses speakers placed in close proximity to the ears (hence the name earphone) to convert the signal into audible sound waves.
They are normally detachable, using a jack plug. Typical products to which they are attached include the walkman, mobile phone, CD player, MP3 player, and personal computer. Some headphone units are self-contained, incorporating a radio receiver. Other headphones are cordless, using radio (e.g. analogue FM, digital bluetooth) or infrared signals to communicate with a "base" unit.
Headphones may be used to prevent other people from hearing the sound either for privacy or to protect others. They are also used to exclude external sounds, particularly in sound recording studios and in noisy environments.
Using headphones at a sufficiently high volume level causes temporary or permanent hearing impairment or deafness. Other risks arise from the reduced awareness of external sounds — some jurisdictions regulate the use of headphones while driving vehicles. Also, most European countries have imposed high penalties since 2002 for drivers not using a headset while operating a mobile phone in a car, to ensure that drivers keep their hands on the vehicle's controls.
Prominent manufacturers of headphones
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Ben Tongue, Crystal Radios
Blonder-Tongue man, Ben Tongue has written some useful articles on using headphones with crystal radios.
Offers tube type technology instead of solid state and digital electronics. Also includes classic and military radio pictures, and information.
Scott's Crystal Radios
Scott Balderson has a Headphone Museum and phones for sale. Also Crystal Radios and Test Equipment.
2000 Ohm Headphones
2000 Ohm Headphones in use by WB6FZH with his 1923 Parkin Crystal Radio.
The Crystal Set Radio Club
You have to JOIN first but then you will see the archives with a lot of useful data and discussions about hi-z headphones.