Building A Crystal Radio Out Of Household Items
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Scan day: 17 February 2014 UTC
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Description: Several simple radio receiver projects, including the razor blade "foxhole" radio, that use found materials. Well illustrated with closeup photographs.
Building a simple crystal radio. Building a radio out of household implements. License-free radio frequencies. Getting an Amateur Radio license. Building a crystal radio out of household items. The most difficult part of building a crystal radio is building an efficient earphone that can convert the tiny electrical signals into tiny sounds that our ears can hear. Our first radio used a telephone handset for an earphone, and that works quite well. But another type of earphone is available that fits in the ear so you don't have to hold it. It is also more sensitive than the telephone handset. In order to convert very faint electrical signals into sound, we need a very sensitive earphone. The kind of earphones used in transistor radios or CD players will not do. Those are meant to be driven by a signal loud enough to drive a speaker, and are not sensitive at all. We will talk later (in the scientific part of this chapter) about
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| Page title: | Chapter 4: Radio |
| Keywords: | kid science experiment, science experiments children, science fair projects, science fair project, science experiments for kids, science toys, crystal radio, foxhole radio, razor blad radio, build a crystal radio, physics help, science experiments, toy stores, electronic circuits, educational resources |
| Description: | Make a crystal radio at home with common household materials |
| IP-address: | 209.236.125.156 |
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| Date | Creation Date: 19-may-1999 Expiration Date: 19-may-2015 |