ክሪስታል ራዲዮ
የክሪስታል ራዲዮ የሚሰኘው ከሁሉ በላይ በጣም ቀላል ራዲዮ ተቀባይ ሲሆን፣ በድሮው የራድዮ ዘመን ታዋቂነት ያገኘ ነበር። ክሪስታል ራዲዮ ባትሪም ሆነ ሌላ የኤሌክትሪክ ኃይል አይፈልግም። ይልቁኑ ከሚተላለፍ የራዲዮ ሞገድ አቅም በመውሰድ በራሱ ይሰራል። ለዚህ ተግባር ሲባል ክሪስታል ራዲዮ ረጅም የሽቦ አንቴና ይፈልጋል። ክሪስታል መባሉ ድሮ ይሰራበት ከነበርው ወሳኝ ክሪስታል ጋሌና የተባለ ክፍል የመጣ ስም ነው። በአሁኑ ዘመን ይህ ክፍል በዳዮድ ተተክቷል። ክሪስታል ራዲዮ በጣም ቀላል ከመሆኑ የተነሳ ማንም ሰው ሊሰራው ይችላል። የሚያስፈልጉትም እቃወች አንቴና ሽቦ (ረጅም መሆነ አለበት)፣ ጣቢያ መቀየሪያ ጥቅል ሽቦ (መዳብ) ፣ ክሪስታል ጠቋሚ ወይንም ዳዮድ እና የጆሮ ስልክ (ማለቱ ማናቸውም በጆሮ ላይ ተደርጎ ሙዚቃ ለመስማት የሚያገለግል ኢር ፎን) ናቸው። በርግጥ የክሪስታል ራዲዮ የተወሰነ ጣቢያወችና በዚያው ልክ ድምፁም ከፍተኛ ስላልሆነ ኢር ፎን መጠቀም ግድ ይላል።
ይህ የሚታየው የክሪስታል ራዲዮ የሽቦ ዑደት፣ ቀላል ልዲዛይን ሲያሳይ ነገር ግን የሚያቀበለው ጣቢያ ከአጭር ሞገዶች በላይ መሻገር አይችልም። ከምስሉ እንደምንረዳ ጣቢያ መቀየሪያው ከትይዩእና ተያያዥ አንድ ወጥ ጥቅልል ሽቦወችና ከተለዋዋጭ ካፓሲተር የተሰራ ነው። አንቴናውና መሬቱ በትዩዩ መንገድ የተገናኙ ናቸው። ክሪስታል ራዲዮኖች አንቴናቸው ቢያንስ ቢያንስ 20 m (ሜትር) ርዝመትና 6 m ከፍታ ሊኖረው ያስፈልጋል። ይህ ጉዳይ በሚፈጥረው የካፓሲተር ውጤት ከተወሰኑ ራዲዮ ጣቢያወች በላይና በታች ለመቀበል አዳጋች እንዲሆን ያደርጋል። ሆኖም ግን ከካፓሲተሩ ይልቅ የሽቦ ጥቅልሉን ተለዋዋጭ በማድረግ ብዙ የራዲዮ ጣቢያወችን መቀብል ይቻላል።
- The Xtal Set Society Archived ጃንዩዌሪ 14, 2006 at the Wayback Machine, Dedicated to once again building and experimenting with radio electronics.
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- Stay Tuned. Crystal radio plans and projects.
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- Shortwave Mystery Crystal Radio A shortwave version of the Mystery Crystal Set by KC4IWT.
- A website that lots of information on early radio and crystal sets
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- Nyle Steiner K7NS, Zinc Negative Resistance RF Amplifier for Crystal Sets and Regenerative Receivers Uses No Tubes or Transistors Archived ጁን 6, 2009 at the Wayback Machine. November 20, 2002.
- Crystal Set DX? Archived ሜይ 28, 2007 at the Wayback Machine Roger Lapthorn G3XBM
- Building a crystal radio set A guide to building a simple crystal radio receiver.
- Website which has a large selection of homebuilt crystal and tube radios built by Dave Schmarder.
- The Bose Institute Archived ኤፕሪል 28, 2017 at the Wayback Machine
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- Ellery W. Stone (1919). Elements of Radiotelegraphy. D. Van Nostrand company. 267 pages.
- Elmer Eustice Bucher (1920). The Wireless Experimenter's Manual: Incorporating how to Conduct a Radio Club.
- Milton Blake Sleeper (1922). Radio Hook-ups: A Reference and Record Book of Circuits Used for Connecting Wireless Instruments. The Norman W. Henley publishing co.; 67 pages.
- Robert Andrews Millikan, Henry Gordon Gale, Willard R. Pyle (1922). Practical physics. Ginn. 472 pages.
- JL Preston and HA Wheeler (1922) "Construction and operation of a simple homemade radio receiving outfit", Bu. of Standards, C-120: Apr. 24, 1922.
- PA Kinzie (1996). Crystal Radio: History, Fundamentals, and Design. Xtal Set Society.
- Thomas H. Lee, The Design of CMOS Radio-Frequency Integrated Circuits
- Derek K. Shaeffer and Thomas H. Lee, The Design and Implementation of Low-Power CMOS Radio Receivers
- Ian L. Sanders. Tickling the Crystal - Domestic British Crystal Sets of the 1920s; Volumes 1-5. BVWS Books (2000-2010).