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**pls help for transmiting***

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gurjeet_saini

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Hi frendz
I want to make a simple transmittor to transmit AUDIO about 10METER channel, i search with google but i am not trusting on thos circuits , so can any 1 pls give me a circuit which tested ur self , and good and simple
 
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HI,
Instead of depending on others, assembled any circuit of those circuits and test yourself. Most of the circuits on NET are posted after testing.
 

:shock:yes i tested 1 or 2 but they are not working or they have range only about 10cm , i want range about 10meter or larger please tell any best simple transmitter:roll:
:roll:
 

87_1315394071.jpg



The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broadcast band for the best reception. When the small microphone element is struck by sound, it converts the audio to a change in current through resistor R1 (see schematic diagram).

This electrical change is amplified and eventually frequency modulates the transmitter. The transmission range of the FM microphone is approximately 100 feet, depending on the efficiency of the antenna (properly tuned or not) and the quality of the FM radio receiver.

Download the FM Wireless microphone manual
 

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Hi,
Here you go. This circuit is tested by me long ago. Works fine.
10 W Linear Amplifier by dxzone.com
Here is an other nice circuit:
3 Watt FM Transmitter
And here are a lot lot transmitter circuit, select:
**broken link removed**
Hope it helps.

Though you did not mention what type of transmitter you want, AM or FM?
 
thanks alertlinks bro i want this type of pdf which is very comfortable for me,, i will try and reply when i complete
bro can you share some DIY made by you
 

Ok,
you got all the references I had.
Enjoy.
 

Some ten years back, i was into repair of cordless phones. including long range phones. We have to further increse ranges by making and installing RF amplifiers. Durring that time i made a fm transmitter of very good voice quality. I tested it for once.I put it on air playing a song of Lata ji and went out in car to check its range on car radio. After four miles signal just started to fade. It was a staight highway road. It was on 1.5 x 2 inch board with a power output of 3 watts attached to a rooftop dipole witch provided this range.The supply was 12 volts. Long range transmitters are illegal so i dismantled it. One of my colleague made transmitter for fm radio lahore. In 1982 i made a small walki talki and presented in radio society meeting.
 
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Dear Friends .
Hi
If you want 10 meter transmitter , you can make a simple oscillator and use a HT50 or HT330 trans in series with power supply of oscillator that will make a AM modulation and you can transfer your audio with this simple circuit as well as !
Best Lucks
 
in this diy iwant transistor 2N3904 ,, i can't found this in my spare part ,,any 1 have idea where i found it, or wich transistor i use intead of 2N3904

---------- Post added at 19:28 ---------- Previous post was at 19:24 ----------
goldsmith said:
Dear Friends .
Hi
If you want 10 meter transmitter , you can make a simple oscillator and use a HT50 or HT330 trans in series with power supply of oscillator that will make a AM modulation and you can transfer your audio with this simple circuit as well as !
Best Lucks
Click to expand...
thanks for helping dear , but can you give circuit diagram of this, m new in electronics
 

gurjeet_saini said:
in this diy iwant transistor 2N3904 ,, i can't found this in my spare part ,,any 1 have idea where i found it, or wich transistor i use intead of 2N3904
Click to expand...

The 2N3904 is a NPN general purpose small signal amplifier/switch transistor, any NPN with similar ratings and specifications should work.

2N3904 Datasheet

Do you have a local electronic parts supply? If so what manufacture lines do they carry?

A possible substitute:

NTE123AP Datasheet

Many parts manufactures have an online part substitution guide:

NTE Cross Reference Search

Hope the info helps.
 
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    FvM

    FvM

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As I mentioned in my previous post, there are many possible substitutes. I have already provided the NTE123AP as a possible substitute.


Rather than compile a list of several hundred possibilities, please answer the questions I posed above.

Do you have a local electronic parts supply? If so what manufacture lines do they carry?

Or

Which manufactures of transistors do you have access to, either by local supply or internet access?

If you purchase electronic parts online, post the links to your preferred sites. And one of us can select an appropriate substitute available at the online site provided.

Or

Google "2n3904 compatible substitute"

BigDog
 
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gurjeet_saini said:
in this diy iwant transistor 2N3904 ,, i can't found this in my spare part ,,any 1 have idea where i found it, or wich transistor i use intead of 2N3904
Click to expand...

If I understand correctly buying the component is not a problem (it is so widely available that I doubt that there I shop that doesn't have it) but you are looking for a sumstitute that you already have in your spare parts, in that case you should tell us what you have available.
 

Ok,

I would recommend giving them a call, tell them you need to replace a 2N3904 and do them have it or a compatible substitute. If the recommend a substitute, ask them for the exact part number and post it here.

One of us will be able to tell you whether or not it is a reasonable replacement for the 2N3904.

BigDog
 

goldsmith said:
Dear Friends .
Hi
If you want 10 meter transmitter , you can make a simple oscillator and use a HT50 or HT330 trans in series with power supply of oscillator that will make a AM modulation and you can transfer your audio with this simple circuit as well as !
Best Lucks
Click to expand...
Tried something similar recently, was absolutely useless. Please see thread https://www.edaboard.com/threads/223108/#post951096
 

Hi gurjeet,
The best way to find the alternate to 2N3904 or an equivalent look into your available stock and what so ever are available there, see their Datasheet and find the equivalent. That is the shortest way but at the same time as alexan said this transistor is so commonly available that even from an electronics repair shop you can get it.
 

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