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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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How to make a radio
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. |
#2
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How to make a radio
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 N3OWJ/4X1GM |
#3
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How to make a radio
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!) |
#4
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How to make a radio
"Geoffrey S. Mendelson" wrote in message ... 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 N3OWJ/4X1GM |
#5
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How to make a radio
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 N3OWJ/4X1GM |
#6
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How to make a radio
farzad Beheshti wrote:
I want to make a simple radio (receiver), 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. For a diode, you may wish to 1st start with the venerable 1N34A germanium diode. Once you have the other circuit components working the way you wish, you could step back in history then, and go with the cat whisker detector. http://www.1n34a.com/parts.htm#diodes http://en.wikipedia.org/wiki/Cat%27s-whisker_detector Google "crystal radio sets" for lots more. -- 1PW |
#7
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How to make a radio
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 Thank you. http://scitoys.com/scitoys/scitoys/r...ade_radio.html http://www.youtube.com/watch?v=skKmwT0EccE&feature=fvw |
#8
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How to make a radio
On 10/19/2009 7:24 AM Geoffrey S. Mendelson spake thus:
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". Well, that's one way to go. But since the OP allowed the use of active devices (e.g., transistors), just not ICs, why not build a "real" radio? But simple: how about the world's most primitive superhet AM radio? or maybe just a "crystal set" but with an audio amp to increase sensitivity? And how about tubes instead of transistors? I'd like to see some circuits for such projects. Say something that runs off a 9-volt battery, maybe with 1, 2 or 3 transistors. -- Found--the gene that causes belief in genetic determinism |
#9
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How to make a radio
David Nebenzahl wrote:
But since the OP allowed the use of active devices (e.g., transistors), just not ICs, why not build a "real" radio? But simple: how about the world's most primitive superhet AM radio? or maybe just a "crystal set" but with an audio amp to increase sensitivity? And how about tubes instead of transistors? I'd like to see some circuits for such projects. Say something that runs off a 9-volt battery, maybe with 1, 2 or 3 transistors. As a seventies kid here in the UK, we had the wonderful Ladybird book - 'Making A Transistor Radio'. http://www.theweeweb.co.uk/public/upclose.php?id=1663 The TRF project was a short plank of wood, some screws and brass cup washers, electronic bits and not a soldering iron in sight! Some related web sites on that. http://homepage.ntlworld.com/henry01...bird_radio.htm http://www.mds975.co.uk/Content/trfradios02.html http://thedomesticsoundscape.com/wor...ird-radio-book -- Adrian C |
#10
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How to make a radio
On Oct 19, 3:04*pm, David Nebenzahl wrote:
On 10/19/2009 7:24 AM Geoffrey S. Mendelson spake thus: 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". Well, that's one way to go. But since the OP allowed the use of active devices (e.g., transistors), just not ICs, why not build a "real" radio? But simple: how about the world's most primitive superhet AM radio? or maybe just a "crystal set" but with an audio amp to increase sensitivity? And how about tubes instead of transistors? I'd like to see some circuits for such projects. Say something that runs off a 9-volt battery, maybe with 1, 2 or 3 transistors. -- Found--the gene that causes belief in genetic determinism Superhet might be a little more than they can deal with and get aligned but what about a regenerative? It offers simplicity with reasonable sensitivity and a 'look what I did' factor. G² |
#11
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How to make a radio
Done that, back when I was about six. Big coil, cap, long wire
antenna. A few have forgotten I think, no batteries. But an antenna can actually pick up power. You may tune the desired frequency for reception and feed it to headphones, but now I am thinking that the extra power coulod be used to run a local oscillator and then you have a hetrodyne reciever. Much better and easire to tune. Intersting. JURB |
#12
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How to make a radio
"farzad Beheshti" wrote in message ... 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. Check eBay for inexpensive AM radio kits. Radio shack sold many of these for kids in the 60s to 80s The kit includes all the needed parts mounted so that you only have to hook up wires between the parts. A small instruction book explains the basic operation. |
#13
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How to make a radio
In message , Adrian C
writes As a seventies kid here in the UK, we had the wonderful Ladybird book - 'Making A Transistor Radio'. http://www.theweeweb.co.uk/public/upclose.php?id=1663 Holy cr.. £40!!!! Wow, I better start digging out my old Ladybird books, I have that exact book somewhere. The TRF project was a short plank of wood, some screws and brass cup washers, electronic bits and not a soldering iron in sight! My first transistor radio project, made me go all dewy eyed remembering that and building it with my grandfather. Thank you for posting that. Some related web sites on that. http://homepage.ntlworld.com/henry01...bird_radio.htm http://www.mds975.co.uk/Content/trfradios02.html http://thedomesticsoundscape.com/wor...ird-radio-book -- Clint Sharp |
#14
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How to make a radio
Clint Sharp wrote:
http://www.theweeweb.co.uk/public/upclose.php?id=1663 Holy cr.. £40!!!! Wow, I better start digging out my old Ladybird books, I have that exact book somewhere. Heh, that's nothing :-) Someone in the UK has it for sale on Amazon marketplace for £109! -- Adrian C |
#15
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How to make a radio
On 8 Nov, 14:05, F Murtz wrote:
I once received a radio station (near tower)with long aerial, an earth to *water pipe , one diode, and some magnetic earphones (the ones with electric magnet and metal diaphragm) No coils or capacitances or anything else. And not so near can still work with this simple setup using a cristal earphone. |
#16
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How to make a radio
On Oct 19, 8:09*am, 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 * * * * * * * * Thank you. What are you going to use for primitive headphones? TMT |
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