Maker Pro
Maker Pro

Demodulation

vick5821

Jan 22, 2012
700
Joined
Jan 22, 2012
Messages
700
Any trustable circuit if I want to design a circuit that will demodulate an amplitude moduated(AM) signal ?

Any suggestion schematic ?

Thanks !

Needed for my mini project ^^

Need some guidance here :)

Thanks ^^
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
I think you need an electric guitar to do that :)

Bob
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
Yeah, for simplicity, start with a crystal radio.

From there, there are various things you can do to improve it. RF amplification before the detector is one. It should not be difficult to find resources for these on the web.
 

Electro132

Feb 12, 2013
261
Joined
Feb 12, 2013
Messages
261
Any trustable circuit if I want to design a circuit that will demodulate an amplitude moduated(AM) signal ?

Any suggestion schematic ?

Thanks !

Needed for my mini project ^^

Need some guidance here :)

Thanks ^^


Hey Vicki, i'm doing something similar but demodulating and then sending out through LED's. Want to work together? Let me know.

Btw, crystal radio would be a good choice to start. Siilar to FM i think ...
 

vick5821

Jan 22, 2012
700
Joined
Jan 22, 2012
Messages
700
Hey Vicki, i'm doing something similar but demodulating and then sending out through LED's. Want to work together? Let me know.

Btw, crystal radio would be a good choice to start. Siilar to FM i think ...

Sure, but my project should end by mid of May HAHAHA
 

john monks

Mar 9, 2012
685
Joined
Mar 9, 2012
Messages
685
AM and FM are quite different.
AM is amplitude modulation where the carrier strength is made larger and smaller.
FM is frequency modulation where the carrier frequency is made higher and lower.
What I suggested is for AM only.
 

Electro132

Feb 12, 2013
261
Joined
Feb 12, 2013
Messages
261
Sure, but my project should end by mid of May HAHAHA


That's fine. I'm working on a project along those lines at the moment so if you're interested or if you know someone who's interested let me know. I'm up to the part of storing energy into a cap as in like a Li-Ion battery so i can use it for other parts in my project.

Cheers
 

HellasTechn

Apr 14, 2013
1,579
Joined
Apr 14, 2013
Messages
1,579
Any trustable circuit if I want to design a circuit that will demodulate an amplitude moduated(AM) signal ?

Any suggestion schematic ?

Thanks !

Something like that with a preamplifier in the output maybe ?

Pretty much same as john's diagram
 

Attachments

  • 14184_158_1.jpg
    14184_158_1.jpg
    7.9 KB · Views: 163
Last edited:

vick5821

Jan 22, 2012
700
Joined
Jan 22, 2012
Messages
700
I need a transformer ? Is your circuit is aplication of AM demodulation ?

TThanks
 

dietermoreno

Dec 30, 2012
238
Joined
Dec 30, 2012
Messages
238
Btw, crystal radio would be a good choice to start. Siilar to FM i think ...

A crystal radio can receive either AM or FM depending on the detector, and you would need different types of antennas for the higher frequencies used by FM.
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
May 8, 2012
4,960
Joined
May 8, 2012
Messages
4,960
I think you need an electric guitar to do that :)

Bob

When you posted this it went right over my head but that was before I was enlightened! :)

Chris
 

vick5821

Jan 22, 2012
700
Joined
Jan 22, 2012
Messages
700
When you posted this it went right over my head but that was before I was enlightened! :)

Chris

How am I able to do a AM transmitter and receiver ? My friend will be doing the AM transmitter and I am responsible for AM receiver. Any suggested circuit ?

No microcontroller is allowed

Thanks :)

Urgent help neded :(
 

duke37

Jan 9, 2011
5,364
Joined
Jan 9, 2011
Messages
5,364
In the UK the rules about transmitting are very strict but some people do transmit VERY low power to activate old radios.

Google 'pantry radio' , some are valve based and some, more convenient, semiconductor based.

You will need to use a low frequency unless you are an expert so, run on medium wave and use a medium wave receiver. If you wish to build your own receiver I would suggest a TRF.
 

vick5821

Jan 22, 2012
700
Joined
Jan 22, 2012
Messages
700
In the UK the rules about transmitting are very strict but some people do transmit VERY low power to activate old radios.

Google 'pantry radio' , some are valve based and some, more convenient, semiconductor based.

You will need to use a low frequency unless you are an expert so, run on medium wave and use a medium wave receiver. If you wish to build your own receiver I would suggest a TRF.

I am doing for low frequency and low cost :)

For my lab work project ^^

Thanks !
 

davenn

Moderator
Sep 5, 2009
14,241
Joined
Sep 5, 2009
Messages
14,241
How am I able to do a AM transmitter and receiver ? My friend will be doing the AM transmitter and I am responsible for AM receiver. Any suggested circuit ?

No microcontroller is allowed

Thanks :)

Urgent help neded :(

Look at post #12 Hellastechn gave you the most basic and cheapest AM receiver possible !! :)

Dave
 
Top