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can somebody help me how to buy those components

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michael 1978

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can somebody help me how to buy thos componenets

please can somebody help, how to find in electronics shop online
those components and to buy, is here juse one to make for all, i need juse one, wich i can use for all projetcs
L1 antenna coil: 470uH with 1 turn wrapped = 2
L2 antenna coil: 470uH primary, 23uH secondary = 2
L3 antenna coil: 600uH to 680uH primary, to to 20 turn secondary = 2
L4 antenna coil: 330uH primary 10 to 20 turns for secondary = 2
L5 antenna coil: 600uH to 680uH with tap or secondary winding = 2

i dont know how to find self and to buy, can somebody teach me how to select

because i am reading on book, make your own radio transistor
i was in one shop here, i whait 3 months he cant find me, because he say is very difficult to find and, they dont use anymore, but book is from 2013 is not old thnx
 

Re: can somebody help me how to buy thos componenets

They are simple radio coils. Nobody sells them because nobody buys them, instead you should make them yourself after you learn about the basics of electronics.
 
Re: can somebody help me how to buy thos componenets

ooh man i learn the basic of electronics, between the times i forget, this is something normal, second in basic in electronics wich i learn they dont tell how to make antenna coil, even self the book dont tel
 

Re: can somebody help me how to buy thos componenets

There are books and online tutorials about how to calculate the number of turns and size of a coil.
There are hundreds of FM transmitter circuits online and their coils and capacitors are almost all the same. Use them in a radio.
 

Re: can somebody help me how to buy thos componenets

may i ask something, si antenna coil ferrit, to wind one coil for example 25 turns, and second 30 TURNS, is dat ferrite antenna thnx
 

Re: can somebody help me how to buy thos componenets

michael 1978 said:
may i ask something, si antenna coil ferrit, to wind one coil for example 25 turns, and second 30 TURNS, is dat ferrite antenna thnx
Click to expand...
I cannot understand your poor English. Please ask in your own language on a forum in your own country.
 

Re: can somebody help me how to buy thos componenets

si antenna coil ferrit, to wind one coil for example 25 turns, and second 30 TURNS, is dat ferrite antenna...
Click to expand...

The L value depends on the diameter and the number of turns. The core material (the mu value is needed if you want to use a ferrite core) is air in most common cases but can be ferrite (screws that can be moved to adjust the L value). For the open air core inductors, you can compress or expand the coil to adjust the L value (within some extent).

Usually the formula does not take account of the end effects and the leakage is rarely considered. But you use the formula and the L value should be on target but you can use a meter to get more accurate value (many multimeters can measure L and C)
 

Re: can somebody help me how to buy thos componenets

Audioguru said:
I cannot understand your poor English. Please ask in your own language on a forum in your own country.
Click to expand...

easy man i ask everywhere

- - - Updated - - -

c_mitra said:
The L value depends on the diameter and the number of turns. The core material (the mu value is needed if you want to use a ferrite core) is air in most common cases but can be ferrite (screws that can be moved to adjust the L value). For the open air core inductors, you can compress or expand the coil to adjust the L value (within some extent).

Usually the formula does not take account of the end effects and the leakage is rarely considered. But you use the formula and the L value should be on target but you can use a meter to get more accurate value (many multimeters can measure L and C)
Click to expand...


thnx

do you know any software that calculate the diamter the length etc

- - - Updated - - -

c_mitra said:
The L value depends on the diameter and the number of turns. The core material (the mu value is needed if you want to use a ferrite core) is air in most common cases but can be ferrite (screws that can be moved to adjust the L value). For the open air core inductors, you can compress or expand the coil to adjust the L value (within some extent).

Usually the formula does not take account of the end effects and the leakage is rarely considered. But you use the formula and the L value should be on target but you can use a meter to get more accurate value (many multimeters can measure L and C)
Click to expand...


thnx

do you know any software that calculate the diamter the length etc
 

Re: can somebody help me how to buy thos componenets

There are a large number of online software that can calculate the L values for inductors. Google for it!
 

Re: can somebody help me how to buy thos componenets

c_mitra said:
There are a large number of online software that can calculate the L values for inductors. Google for it!
Click to expand...

but my problem is i dont know, how to make, where to start it
because i know how just inductor to make, but i see there are 4 wires, inductor you make it to wind some turns, and there are 2 wires, but my antenna must have 4 wire, how to wind it, do you know any example on the internet, because i did not find nothing
thnx
do you see
Naamloos.jpg
 

Re: can somebody help me how to buy thos componenets

These are shortwave radio antenna front end coils. In fact they are two coils on one ferrite rod- usually 1 cm or so in diameter.

One coil is untuned- about 100 to 150 turns- the number is not critical. One end is connected to the antenna and the other end is connected to the earth ground.

The other coil- wound in close proximity- is about 10-20 turns- and is part of the tuned circuit. It is essentially connected to a tuning capacitor to select the station.

The ferrite rod must be low loss low mu type- exact properties does not matter.

Modern radios can be messy and complicated and a simple radio with (or without) a single transistor can be rather simple.

But I do not know what you are trying to do.
 

Re: can somebody help me how to buy thos componenets

I didn't calculate the frequency and Michael did not say its frequency. He posted its schematic (TRF AM radio tuner?)on another website:
 

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Re: can somebody help me how to buy thos componenets

c_mitra said:
These are shortwave radio antenna front end coils. In fact they are two coils on one ferrite rod- usually 1 cm or so in diameter.

One coil is untuned- about 100 to 150 turns- the number is not critical. One end is connected to the antenna and the other end is connected to the earth ground.

The other coil- wound in close proximity- is about 10-20 turns- and is part of the tuned circuit. It is essentially connected to a tuning capacitor to select the station.

The ferrite rod must be low loss low mu type- exact properties does not matter.

Modern radios can be messy and complicated and a simple radio with (or without) a single transistor can be rather simple.

But I do not know what you are trying to do.
Click to expand...

ah you mean i one ferrite, you make on coil for earth and ground, and die other for tunning, ah thnx man,
YES i am reading one book and he start from
CHAPTER 6 Transistor Refiex Radios
CHAPTER 7 A Low-Power Regenerative Radio
CHAPTER 8 Superheterodyne Radios
CHAPTER 9 Low-Power Superheterodyne Radios
CHAPTER 10 Exotic or "Off the Wall" Superheterod
is very good book they explain everything, excpet this antenna,
so now is no problem i know how to make antenna, for the rest i know

thanx man
 

Re: can somebody help me how to buy thos componenets

so now is no problem i know how to make antenna, for the rest i know...
Click to expand...

It is really great because making an efficient antenna is more like a black art than science. And anybody can make an ordinary (inefficient) antenna.

... for the rest i know
Click to expand...

A modern radio is an ultimate beauty in electronic analog design. There is so much to know...
 

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