Eshal
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Well , i think your teacher didn't tell you any thing regarding the specifications for instance how much power is required or how much is impedance of load ( what kind of antenna ) , and ... etc .So my Analog Communication teacher give us an assignment and told us to make the Low Level AM Transmitter.
What do you mean by that ?And what about frequency of station ? (carrier signal )
Perhaps he has radiation meter , or perhaps he wants to test it with an oscilloscope . or perhaps he have a receiver !My teacher didn't tell me about this. But I am amaze how my teacher test my transmitter? I think he would tell me to buy ready-made AM receiver.
at first you will need an oscillator as it's input . ( as you can see at the picture . ) you can easily make it .
But if you want simpler way , tell me about this : d you have access to the crystal oscillators with 4 pins ( 1MHZ ) in your country ? and what about HT50 ( red transformer ) ? if yes you can make it at 20 seconds !
Yes, may be.Perhaps he has radiation meter , or perhaps he wants to test it with an oscilloscope . or perhaps he have a receiver !
You mean at the collector of Q2 above R12 in the circuit diagram?And about antenna , , it will be derived from collector , via a capacitor . it can be a dipole antenna !
So my Analog Communication teacher give us an assignment and told us to make the Low Level AM Transmitter.
Teacher said that we students can pickup any circuit diagram from internet and make a transmitter on the breadboard.
You didn't say anything about the carrier frequency and the modulation signal (single tone or a frequency band?).
I don't know if it is allowed in our country. But our teacher denied strictly to use crystal oscillator.@goldsmithtell me about this : d you have access to the crystal oscillators with 4 pins ( 1MHZ ) in your country ?
Yes, ofcourse antenna is required.One final question: What about an antenna? Required?
I need simple carrier oscillator.So - what's your decision, Eshal? What kind of additional information do you need?
Carrier frequency?
I am just allowed 555 timer, 741C etc. In short, I am allowed to use those Integrated Circuits which are studied under course named "Linear Integrated Circuits"(LIC).Are you allowed to use integrated circuits (opamps, differential amps)?
I need simple carrier oscillator.
One more thing, as you(LvW) see in circuit given by goldsmith in post#4. Can you tell me what is the range of that circuit?
And as in this circuit, he used 2 frequency sources "V5" and "V6" having frequency of 15MHz and 15KHz, respectively. So I think I need 2 carrier oscillators one of 15MHz and other of 15KHz. Am I right?
As you said hundreds of KHz are sufficient, so this mean would it provide 30m range?In your case, I do not recommend a frequency in the MHz range. I think some hundreds of kHz are sufficient and easier to handle.
I told you above, our teacher didn't tell us anything about carrier frequency. He just told us about range. 100feet in range i.e. approx. 30mHowever, I don't know if you are completely free to choose a frequency.
So carrier is at 1MHz, this implies I need one carrier oscillator of 1MHz?In the example mentioned by Goldsmith the carrier is at 1 MHz and the modulation signal at 15 kHz. That's all.
Can't you go to the electronics market and ask regarding that ??Sir I don't know anything that what is allowed in my country and which is not.
I can't make any comment about it.
Of course !You mean at the collector of Q2 above R12 in the circuit diagram?
What do you think ? of course you will need that ! as i mentioned at past there are many ways for this purpose ! one o them is an oscillator with a transistor in series with supply ! but it's out put power will be low too !So carrier is at 1MHz, this implies I need one carrier oscillator of 1MHz?
My teacher is strictly forbidden to use crystal oscillator. So if I asked for it from market then it is of no use for me.Can't you go to the electronics market and ask regarding that ??
Actually, it is my first project. Shayaan told you that our department is not so good, they just come in the class teach us and go out of the class. It is first project. I don't know what LvW trying to said, I am understanding all his help but I am unable to get any idea as you are pointing out to get idea from LvW's discussion.By the way , i think LvW have replied all of your questions as well as possible , didn't you try to get the idea ?
I don't know what is your teacher's reas reason , but no problem , you can use this circuit as your oscillator stage , easily , see below , please :My teacher is strictly forbidden to use crystal oscillator. So if I asked for it from market then it is of no use for me.
Read his statements again and more carefully and tell me which section isn't clear ! ( however i believe it is as clear as enough . )Actually, it is my first project. Shayaan told you that our department is not so good, they just come in the class teach us and go out of the class. It is first project. I don't know what LvW trying to said, I am understanding all his help but I am unable to get any idea as you are pointing out to get idea from LvW's discussion.
If you need a complete circuit , i have thousands of these circuits in my designs . i can give you some of them easily , but you have told that you want learn , it is the reason that why i didn't give you the final circuit !Don't you provide me a complete circuit diagram till tomorrow?
Yes shayaan have told me regarding this issue , and i told him that here is the same too ! ( an advice : try to learn yourself , instead of trying to rely on teachers of your university ! )ctually, it is my first project. Shayaan told you that our department is not so good,
See good dreams ! and take care !I am leaving by now. Because tomorrow, I mean today (Monday) I have to university. It is 2AM in my country. But please leave your reply.
I am just allowed 555 timer, 741C etc. In short, I am allowed to use those Integrated Circuits which are studied under course named "Linear Integrated Circuits"(LIC).
Does this make you understand, what I allowed or which isn't?
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