TV oscilloscope

[DanielVidz]

Very nice, I want one.

A schematic or link would be greatly appreciated.

Thanks in advance.

[DoctorWINOMD]

Just using a TV as the O-scope monitor does NOT a genius make.

[MrRadionave]

Good!

[pret83]

Hi, nice job. What is the resolution of the image, and how it can fit into the RAM of the uC? Or did you use som external sram?

[Garpk2]

wow it's fantastic. can you send me the schematic or a link?? please

[jaysonkarenjohnson]

Very cool. Would be nice to have a "How-To" or link to more information. Wouldn't mind building one of these for myself.

[attractive149]

nice

[rogerreis1000]

não entendi nada???

[ubuntupokemoninc]

atmel?

[DanFrederiksen]

although should probably have a faster sampler. 600kHz is a tad low. but nice project anyway :)

[DanFrederiksen]

very nice. what's the BOM on that design?

[FezzerPete]

Very nice man.

[hackvault101]

please can you send me the schematics and the source i need this

[ubuntupokemoninc]

can you send me the schematic?

[p1oooop]

any chance I can get the source + schematics?

[mikewm9v]

the money and time you dropped on this cub scout project would have bought you a nice development board and a used tek scope

[electroham25]

Nice job, could you please email me the schematics and firmware also

[twitchd8]

okay, so it's a digital scope using the television traces as a display... nice project... but I'm kinda weary of digital scopes... :\ you've got to watch for their cutoffs.... a nice older-style Oscilloscope shows those sine waves a LOT better, as I'm sure you know... but yeah, nice project... I'm wondering... did U devise this, or did you find the project somewhere? I'm sure it would be a neat project to build and code... :P

[faffaflunkie]

New show from FOX.

[Shaunakde]

Hats off!

[antienjigglement]

I like it!

[MrTubeAudio]

Można prosić o schemat? I wsad do Megi? W końcu zaopatrzyłbym się w coś co pozwala na obejrzenie przebiegu :) BTW: zadziała to z monitorem komputerowym CRT czy używa kompozytowego wejścia wideo w telewizorze?

[tzkelley]

Very nice. Where can I get the schematic and firmware?

[tubeblack49]

dude, I would buy one. selling any?

[temporario3]

Why have you chosen to use an external ADC, instead of the ATmega's built-in?

With ADC0820 you can get some 666k Sample/Sec, enough to read a triangular wave up to 333kHz or a sinusoidal wave up to around 33kHz, right?

Are you sending the image to TV encoded as some RF channel, or using the TV's RCA inputs? Is the microcontroller "translating" the image to the TV, or is there an external circuit to do this task? How you did that? What about the screen resolution?

[tierchen616]

@temporario3

The internal ADC is too slow and the accuracy is too bad for ambitious measurements.

[temporario3]

@tierchen616 Thanks for taking the time to answer me! But if you happen to have any more time, please take a look at the other questions I've made at my previous comment. :)

[SpecklePattern]

This is very nice indeed. I am interested about how can you create the timeshift so that the signal stays stationary and doesn't travel on the screen?

[phaub]

@SpecklePattern: You need a trigger. Before starting the capture and signal display for a new screen, you have to wait for an event such as when the signal crosses zero with a positive slope.

[SpecklePattern]

Ah. Ok. I was just thinking that I could do potentiometer next to microcontroller (that takes the samples) and adjust a delay between samples. But there is always differences on the sample timing (and when there are tons of samples) so I guess that triggering is the way to go. Thanks.

[etmax1]

@SpecklePattern Synchonising is done by having a comparator that triggers (starts the scan) when the level is above a certain level. As the waveform is periodic it triggers at the same point each time

[SpecklePattern]

@etmax1 That was my guess also when I was reading about the many applications of a operational amplifier. Problem is when one is using logical signals rather than nice harmonic waves like in this. Then the picture might come alive. The solution in those is to adjust the feedback and other resistors on the Schmitt trigger version of comparator.

[thewii552]

@SpecklePattern he was changing the frequency. don't change the frequency

[BadAndUgly]

Wow! nice build =) puts old TV's to good use.

[d3u1d4e]

Brilliant!

[ElectronicSculptures]

Great work. I guess you're fed up with real

TV channels.

[luna4550]

Cool... very nice..

[maxelly99]

Nice work. Could be interesting if you add a variable marker to measure and display voltage and in horizontal two of them to display /\T.

[Chemikas007]

can you give circuit ?

[scericli]

X2 Thanks

[thisispbs]

its not green

[Pujc]

Jó nagyon jó! :) ! Good wery good , :)))

[hanspore]

Very Nice

[formatdyskuc]

Fajny projekt, skąd można zdobyć schemat?

[DreHectik]

As much as I like hearing the tick tock of boredom...you should try to incorporate the audio that corresponds to the visuals. Really cool stuff non the less.

[Intosia]

wow very nice! I want one!

[tatgergo]

This looks cool.

[edgemaker11]

interesting, from where can I get the schematics.