How to make a radio
in [Repair]
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From: farzad Beheshti on 19 Oct 2009 10:09 I want to make a simple radio(reciever), without using any IC and by capacitor, inductor, transistor, diode and other simple electrical device Would you mind telling me how can I do that. Have you any reference or do you know any website or group to help me Thank you.
From: Geoffrey S. Mendelson on 19 Oct 2009 10:24 farzad Beheshti wrote: > > I want to make a simple radio(reciever), without using any IC and by > capacitor, inductor, transistor, diode and other simple electrical > device > Would you mind telling me how can I do that. Have you any reference > or do you know any website or group to help me Search for crystal radio or "foxhole radio". You will need something to tune the radio, usually a coil and capacitor, something to detect the signal (convert from the electrical equivalent of radio waves to sound waves) which can be a packaged diode or one made from common parts, such as a crystal (usually galena, aka iron pyrite), an old razor blade, or a pencil lead, and something to convert the electricity to sound, which is usually a crystal or magnetic earphone. So you will need some parts, but not many, and you may be able to improvise them. When I was a child, I used to make radio coils out of empty toilet paper rolls. Much to my wife's chagrin, I still automacticly save them, although I have not made such a coil in well over 20 years. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel gsm(a)mendelson.com N3OWJ/4X1GM
From: Bryce on 19 Oct 2009 16:30 Geoffrey S. Mendelson wrote: > farzad Beheshti wrote: >> >> I want to make a simple radio(reciever), without using >> any IC and by >> capacitor, inductor, transistor, diode and other simple >> electrical device >> Would you mind telling me how can I do that. Have you >> any reference or do you know any website or group to help >> me > > > Search for crystal radio or "foxhole radio". You will need > something to tune the radio, usually a coil and capacitor, > something to detect the signal (convert from the > electrical equivalent of radio waves to sound waves) which > can be a packaged diode or one made from common parts, > such as a crystal (usually galena, aka iron pyrite), an > old razor blade, or a pencil lead, and something to > convert the electricity to sound, which is usually a > crystal or magnetic earphone. > > So you will need some parts, but not many, and you may be > able to improvise them. > > When I was a child, I used to make radio coils out of > empty toilet paper rolls. Much to my wife's chagrin, I > still automacticly save them, although I have not made > such a coil in well over 20 years. > > Geoff. > You will need a long wire antenna - 20+ meters - unless you are located very near to a broadcast station. A ground connection helps as well. Iron pyrite (aka fool's gold) is iron sulfide. Galena is lead sulfide. Either will work as a detector diode. Bryce (crystal set user in 1953!)
From: WW on 19 Oct 2009 17:08 "Geoffrey S. Mendelson" <gsm(a)mendelson.com> wrote in message news:slrnhdotj7.s5n.gsm(a)cable.mendelson.com... > farzad Beheshti wrote: >> >> I want to make a simple radio(reciever), without using any IC and by >> capacitor, inductor, transistor, diode and other simple electrical >> device >> Would you mind telling me how can I do that. Have you any reference >> or do you know any website or group to help me > > > Search for crystal radio or "foxhole radio". You will need something to > tune the radio, usually a coil and capacitor, something to detect the > signal (convert from the electrical equivalent of radio waves to sound > waves) which can be a packaged diode or one made from common parts, such > as a crystal (usually galena, aka iron pyrite), an old razor blade, or a > pencil lead, and something to convert the electricity to sound, which is > usually a crystal or magnetic earphone. > > So you will need some parts, but not many, and you may be able to > improvise > them. > > When I was a child, I used to make radio coils out of empty toilet paper > rolls. Much to my wife's chagrin, I still automacticly save them, although > I have not made such a coil in well over 20 years. > > Geoff. > You must have a few thousand by now (<:) grin. > -- > Geoffrey S. Mendelson, Jerusalem, Israel gsm(a)mendelson.com N3OWJ/4X1GM
From: Geoffrey S. Mendelson on 19 Oct 2009 17:19
I wrote: >> When I was a child, I used to make radio coils out of empty toilet paper >> rolls. Much to my wife's chagrin, I still automacticly save them, although >> I have not made such a coil in well over 20 years. >> >> Geoff. WW wrote: > You must have a few thousand by now (<:) grin. No, my wife just quietly throws them out. Occasionaly she does remind me. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel gsm(a)mendelson.com N3OWJ/4X1GM |