Demodulation

[vick5821]

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]

I think you need an electric guitar to do that

Bob

 

[john monks]

Here you go.
http://imageshack.us/photo/my-images/593/amdemodulator.jpg/

 

[(*steve*)]

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]

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]

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]

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]

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]

Here you go.
http://imageshack.us/photo/my-images/593/amdemodulator.jpg/

I think that circuit is all it takes.

(edited)

 

[(*steve*)]

Theese diodes are called Varicap

The (not your) link was to a simple crystal radio with no varicap diodes in sight.

 

[HellasTechn]

Your link was to a simple crystal radio with no varicap diodes in sight.

That Link wasnt mine !

 

[HellasTechn]

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

 

[HellasTechn]

Your link was to a simple crystal radio with no varicap diodes in sight.

Disregard what i sayd about the varicap. Theese are used in FM modulation.
My mistake.

 

[vick5821]

I need a transformer ? Is your circuit is aplication of AM demodulation ?

TThanks

 

[dietermoreno]

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]

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]

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]

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]

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]

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