how to design digital oscilloscope?

we will design low cost digital oscilloscope with AC Coupling and DC coupling.

let me know if any idea about circuit design and how to implement all analog input section and analog front End with micro-controller interfacing .

On the BitScope site they provide a CircuitCellar INK article on how to make a digital scope (you might have to register with them to see it, but it's free):

http://bitscope.com/download/files/e043pdf1.pdf

It's issue 97, August 1998 of Circuit Cellar INK

Do you understand the implications of every Tom, Dick, and Harry knowing how to build their own Oscilloscope?

There are surely a number of conspiracy theories that depend on the average member of the public, in Third World countries, not having access to Oscilloscope Technology.

1. Resonant Frequency Technology:

A personal Oscilloscope would make Free Energy Physics experiments easy.
An application of Resonant Frequency Tech makes HHO Brown's Gas synthesis easy.
This will replace oil fuels, and restart the Industrial Revolution in the Third World.
Diseases can be killed by Resonant Frequencies. This would replace Antibiotics.

2. Electromagnetic Pollution.

The combinations of electromagnetic frequencies can have unexpected side-effects.
They will be unexpected for as long as they cannot be detected. Oscilloscopes do that.
Secret Spy Transmissions can be detected by Oscilloscope.
HAARP can cause Natural Disasters, and oscilloscopes in public hands will prove that.

3. New Inventions.

Looking at wave-traces would spark ideas for new products and technologies a few have thought about, but hope no one else has, yet.

Nikola Tesla figured out a way to supply electricity to every home in the World by tapping into the Schumann Cavity.

Power monopolists surely want this technology to stay forgotten!

I asked this very Question in YAHOO! Answers, and, to my amazement, an obvious *shill* came on to come and discourage me from inquiring along such a line. I think its' this "why do you want to reinvent the wheel" .... guy.

Back when we had the transistor radio, there were those of us who STILL BUILT OBSOLETE CRYSTAL RADIO SETS. Why?

1. We wanted to know how our elders did it in their day.

2. We wanted to understand the principles.

3. You never know when your life might depend on being able to assemble a radio that needs no power source.

(I am sure that a Nuclear EMP can't knock out a Crystal Radio!)

So, someone POMPOUSLY come on, and says, "Why are you experimenting?"

How DARE they!

Is it April first already?!

No, it's four days 'til the Mayan Apocalypse.

I want to design low cost oscilloscope for student use in laboratory
i will take this reference design to built low cost oscilloscope for student with 20MHz bandwidth.

Thats why scientist play with atoms while bigger fools look on

Hmmmmm Not to worry Why not biuld your own poscilliscope. That was after all part of the home learning kit many years ago for self study provided by heathkit
P
WHAT I WOUKDNT HAVE DONE FOR THAT IN YOUNG DAYS EVERY BOYS DREAM THAT WAS

I remenber it was always advertised in everyday ipelectronics when I must have been approximately six going on seven building my first crystal radio using a book by ladybird entitled how to build your own transistor radio which was a reflex design built on wooden breadbourd using screws for connections ALL coils wound by hand back in the early 1970's implementing the early OC44,OC71,OC72 mullard series transistors We didnt have much money then Our early child hood gifts were books and educational toys

We made our own xmas decoration Our telephones were two Tin cans on a peace of string not mobile phones or transmitters and microphones were made from carbon pencil sandwidged btw Carbon brushes with a peace of carbourd which secured onto the pencil carbon by poking the pencil led through the card so that it looked like a sail

We used to dream valves and tesla coils, Vandergrapgh generators, Whimshurst machines

We built shocking machines out of hand wound induction coils with steel nails as cores and the mutivibrator circuit relied on the magnetic flux of the coil which would open break the contacts

These were made from Ex post office relays which formed part of the telephone exchange in those days

We played with macarno sets building models with nuts and books with steel pulleys and played with lego Maths education kits were the abacuss and that was how we learnt to add and subtract

Calculators werent allowed So mental arithmetic and times tables were memorised Formulas were transposed by hand not on pc

Look at this lot now Know nothing, can do nothing, are nothings Brilliant Half the industry wrecked cant manufacture cant put together a technical drawing cant make anything at all, cant read, cant write, cant add up unemployed and no future, no pentions, on the street, homeless at the age of 50 plus, A DWP GOVERNMENT OFFICE that doesent even know. How to get people back into work A country of banks that help themselvez to massive bonuses and lay off god knows how many staff Corperate chains going bust, and dont even know where or what address they have sent a payment card too Bussinesses who cant or dont know how to put a database together to track jobs, keep stock records or accounts A whole country that is completely out of date with the rest of the world A plotical party that shuts schools,shuts colleges, hikes uni fees and then says Oh why so many people unemployed Oh why no jobs Oh why cant they operate. A Pc Oh why have got no council housing Oh why no bussiness Oh why so many people in prisons then Oh Oh Oh

Oh my grate gracious balls of fire

Mother do you think they will drop the bomb

Marvelous Well done our leaders what a splendid job youve done with this country

That was our fun and how we learnt

_second try to post_

Have a look on the below link.
http://www.gabotronics.com/oscilloscopes/view-all-products.htm
They have a setup for 49USD
You can also there all the layout and software it is a good start for a design.

* E well done Thankyou Althhough still feel its a good idea to devolop yourself reasons being that you dont just accept that modules can be built and all you have to do is write software

Otherwise you dont learn anything about hardware design plus printed circuit board design and alas this has fall backs as well because you then become far to reliant on the manufacturer and then low and behold when you have to do this yourself

Bang! ! Oh dear Ive got no one who can put a printed circuit board together or design a hardware interface

Hence good idea but encourages lazy itus A very formiddible and highly infectious desease which is extremely apparent in the united Kingdom resulting in dum terminals and no manufacturing breeding exessive unemployemt where certian human species have unfortunatley changed thier hunan appearance to a common animal normally found on farms being identified as the very common enormous pink piggy which makes grunts, consistantly consumes much rubbish and utters enormous words of uslessness whilst procliaming its in fact a huge advocate of health and saftey and does as much as it possibly can to avoid employment whilst it nuzzles its nose into company affairs forcing company closures and wrecks properties left right and center

Its bad enough as it is with the piggy industry which encapsulates property development without this as well

Hence we arrive at the incredible conservative piggy the gingantic labour piggy, the combination of colours fighting away creating the ultimate purple piggy a horendous sight for the eyes nevermind anyone elses lives which this might come into contact with and also bad for the economy and leadership in the UK

All good spirited of course Its however time to call in the abattpiors to dipose of these piggies lest they devour the entire county leaving much povert and incertainty

thank to all for support and guideline...

@mark
It is sad to read your life story in be tween the lines and your frustrations

Bud if you followed the link and where reading the information on that site.
Then you can read yes you can buy the module and also you can read that all hardware (schematics and board layout) and software is for free on the site . (open source)
Even so they ask for other users to modify there design.

On that way you can adjust the design (hardware & software) to your needs and you always can produce your own.
So it makes jobs for the ones that are smart enough to understand the concept from open source look at Linux.

I know it is easier to complain than to adjust to a changing world.

p.s. I personal i life in Greece sent home from my job 3 months ago, because they found somebody that want to do the same job for less money, yes he does not have the same know how, i never complaint i adjusted next month i start a new job with more salary.