How to make a radio

F

farzad Beheshti

Guest
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.
 
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
Click to expand...

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@mendelson.com N3OWJ/4X1GM
 
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
Click to expand...
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!)
 
"Geoffrey S. Mendelson" <gsm@mendelson.com> wrote in message
news:slrnhdotj7.s5n.gsm@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.
Click to expand...

--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM
Click to expand...
 
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.
Click to expand...
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
 
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.
Click to expand...
http://scitoys.com/scitoys/scitoys/radio/homemade_radio.html
http://www.youtube.com/watch?v=skKmwT0EccE&feature=fvw
 
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".
Click to expand...
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
 
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.
Click to expand...
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
 
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.
Click to expand...
WW wrote:
You must have a few thousand by now (<:) grin.
Click to expand...
No, my wife just quietly throws them out. Occasionaly she does remind me.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM
 
On Oct 19, 3:04 pm, David Nebenzahl <nob...@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
Click to expand...
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.

G˛
 
"farzad Beheshti" <farzadbeheshti12@gmail.com> wrote in message
news:f338ef88-f1dd-4783-9326-f9f2ae3754a9@j19g2000yqk.googlegroups.com...
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.
Click to expand...
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.
 
In message <7k48t3F383ts8U1@mid.individual.net>, Adrian C
<email@here.invalid> 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.. Ł40!!!! Wow, I better start digging out my old Ladybird
Click to expand...
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
Click to expand...
that and building it with my grandfather. Thank you for posting that.
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
Click to expand...
--
Clint Sharp
 
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
 
Clint Sharp wrote:

http://www.theweeweb.co.uk/public/upclose.php?id=1663
Holy cr.. Ł40!!!! Wow, I better start digging out my old Ladybird
books, I have that exact book somewhere.
Click to expand...
Heh, that's nothing :)

Someone in the UK has it for sale on Amazon marketplace for Ł109!

--
Adrian C
 
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
Click to expand...
Here's a couple of ideas I found via Google:
<http://www.somerset.net/arm/fm_only_one_transistor_radio.html>
<http://simple-circuit.blogspot.com/2009/08/simple-single-transistor-radio.html>

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------
 
Bob Larter 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

Here's a couple of ideas I found via Google:
http://www.somerset.net/arm/fm_only_one_transistor_radio.html
http://simple-circuit.blogspot.com/2009/08/simple-single-transistor-radio.html


I once received a radio station (near tower)with long aerial, an earth
Click to expand...
to water pipe , one diode, and some magnetic earphones (the ones with
electric magnet and metal diaphragm)
No coils or capacitances or anything else.
 
On 8 Nov, 14:05, F Murtz <hagg...@hotmail.com> 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.
Click to expand...
And not so near can still work with this simple setup using a cristal
earphone.
 
In article <4af6c267$1@dnews.tpgi.com.au>,
F Murtz <haggisz@hotmail.com> wrote:

Bob Larter 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

Here's a couple of ideas I found via Google:
http://www.somerset.net/arm/fm_only_one_transistor_radio.html
http://simple-circuit.blogspot.com/2009/08/simple-single-transistor-radio.h
tml


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.
Click to expand...
Pretty much all those coils and capacitors do (in a single-diode set) is
keep interfering stations out -- usually by shunting them to ground.
They do nothing to "help" the station you want.

Isaac
 
On Oct 19, 8:09 am, farzad Beheshti <farzadbehesht...@gmail.com>
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.
Click to expand...
What are you going to use for primitive headphones?

TMT
 
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