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Project title How to build a wireless telegraph set
Difficulty Level High school
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Description
The simplest wireless telegraph set consists of a means of generating and controlling a spark which sends out radio waves into the air, and a receiver or detector to detect the radio waves. Probably the simplest way to generate and control a spark is to use a switch (called a telegraph key) to turn on and off a buzzer which generates sparks. The simplest way to receive or detect the radio waves generated by the buzzer is to use an AM radio tuned to a place on the dial where there are no other stations.  
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