How to make a radio
in [Repair]
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From: 1PW on 19 Oct 2009 17:26 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
From: Sofa Slug on 19 Oct 2009 17:48 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/radio/homemade_radio.html http://www.youtube.com/watch?v=skKmwT0EccE&feature=fvw
From: David Nebenzahl on 19 Oct 2009 18:04 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
From: Adrian C on 19 Oct 2009 18:52 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/ladybird_radio/ladybird_radio.htm http://www.mds975.co.uk/Content/trfradios02.html http://thedomesticsoundscape.com/wordpress/?tag=ladybird-radio-book -- Adrian C
From: stratus46 on 19 Oct 2009 23:49
On Oct 19, 3:04 pm, David Nebenzahl <nob...(a)but.us.chickens> 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 |