Osciiloscope video - Page 1
Forum section: electronics / general

author: lnx64
author_rank: Regular Contributor
timestamp: November 08, 2013, 06:00:52 am
content: Have been playing around a little with my Tektronix 2236 today.Thought this was kinda cool.The screenshot below, used my laptop as a way to generate the precise vertical sawtooth required from my Sega Genesis, which is actually 59.92 Hz. The horizontal was achieved actually by simply setting my timebase knob to sweep at the right speed that I needed, and then use the little cal knob to dial it in correctly. This isn't perfect though, it still loose horizontal hold. The vertical over time DOES scroll. The composite video output of the console is connected to the Z input of the scope.The second link, is just completely from my soundcard. It was a 32-bit 96KHz audio file.Enjoy!And

author: Unknown
author_rank: Unknown
timestamp: November 08, 2013, 06:17:08 am
content: Quote from: lnx64 on November 08, 2013, 06:00:52 amI approve of this video

author: mtdoc
author_rank: Super Contributor
timestamp: November 08, 2013, 06:32:19 am
content: Awesome!Quote from: lnx64 on November 08, 2013, 06:00:52 amLink to the file? I would love to show this to my kids on my 2236

author: lnx64
author_rank: Regular Contributor
timestamp: November 08, 2013, 06:59:01 am
content: I'm on my phone right now and the link is from my friend. He generated the file, I'll ask him if I can link directly from his server or if I should relink it.

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: November 08, 2013, 07:41:01 am
content: Nice video.If you can find a DC coupled audio output, then you should be able to prevent the display from bouncing all over the place.

author: Stonent
author_rank: Super Contributor
timestamp: November 08, 2013, 11:18:45 am
content: Quote from: Tac Eht Xilef on November 08, 2013, 06:17:08 amVF-31 also approves.

author: lnx64
author_rank: Regular Contributor
timestamp: November 08, 2013, 09:20:55 pm
content: Quote from: mtdoc on November 08, 2013, 06:32:19 amHere you go, sorry I took longer than expected, I slept in.http://www.mediafire.com/download/rerbr9kclc3dt9w/felix.flacIt's a FLAC file, VLC works good, but I noticed on some sound cards, you may need to invert channel B.

author: Stonent
author_rank: Super Contributor
timestamp: November 08, 2013, 09:35:28 pm
content: Oh good it is in flac format. I tried an mp3 of oscillofun once and it just filled the screen with garbage, once I found a flac it was fine.

author: mtdoc
author_rank: Super Contributor
timestamp: November 08, 2013, 09:47:33 pm
content: Quote from: lnx64 on November 08, 2013, 09:20:55 pmExcellent! Thank you.

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 08, 2013, 09:57:22 pm
content: Doesn't work at my DSOX2002A, but I think that I do not have enough goodPC sound card.

author: lnx64
author_rank: Regular Contributor
timestamp: November 08, 2013, 10:26:07 pm
content: Quote from: Hydrawerk on November 08, 2013, 09:57:22 pmYou'll need to find the specs on your sound card. The file is 32-bit 96KHz.Audacity can slow it down so it doesn't get aliased by the sound card, distorting the graphics, you'll just have to match the sampling rate of your sound card though. Might be 48KHz max or something. Even if 16-bit that should be fine, it's 32-bit float.

author: lnx64
author_rank: Regular Contributor
timestamp: November 09, 2013, 07:57:04 am
content: Here's video of the raster image btw.There's obviously far better ways to do this. I did it the odd, hard, and unique way..

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 09, 2013, 03:20:16 pm
content: At my PC I have an integrated sound card in my motherboard namedIntel Topsfield dp43tf.There is probably aRealTek ALC888VCaudio codec.http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=28&Level=5&Conn=4&ProdID=135It could be set to 96kHz sampling rate, maybe... I am not familiar with this.

author: lnx64
author_rank: Regular Contributor
timestamp: November 09, 2013, 03:34:15 pm
content: Quote from: Hydrawerk on November 09, 2013, 03:20:16 pmI'll be honest, same brand of DAC my MacBook Pro uses, and it looks like it supports the same formats. It should work.Try it in VLC with volume at 100%, and computer volume at 100%.. Maybe something is just making it play wrong or something. I would think even a DSO can do this, though it'll show the retrace lines, unlike the analog scope.

author: Stonent
author_rank: Super Contributor
timestamp: November 10, 2013, 06:39:08 am
content: Felix the FLAC the wonderful wonderful FLAC.

author: Stonent
author_rank: Super Contributor
timestamp: November 10, 2013, 11:07:21 am
content: I tried the flac with a couple of players on my android phone and it just jumped to the end without any sound. I had previously fed oscillofun from a flac into my scope with no problems. I guess it doesnt like the 96k stuff.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: November 10, 2013, 03:00:07 pm
content: The riddle - on a Tektronix 453 oscilloscope

author: lnx64
author_rank: Regular Contributor
timestamp: November 10, 2013, 04:57:54 pm
content: Quote from: Kryoclasm on November 10, 2013, 03:00:07 pmHe cheated. NTSC signal. That's no vector. :p But that is my next project. Proper lm sync separator chip and NTSC video.

author: BravoV
author_rank: Super Contributor
timestamp: November 10, 2013, 05:04:22 pm
content: Quote from: lnx64 on November 10, 2013, 04:57:54 pmThats not cheating, its called pure "analog" magic.Btw, is there any program that can convert any video to that FLAC signal ? or that one is "hand-crafted" ?

author: mtdoc
author_rank: Super Contributor
timestamp: November 10, 2013, 09:33:59 pm
content: I tried unsuccessfully to get Felix going on my Tek 2236, 2467 and my Rigol 2072A using 2 different computers. I could kind of barely make out some of the animation during portions of it...but no joy

author: lnx64
author_rank: Regular Contributor
timestamp: November 10, 2013, 09:58:45 pm
content: Quote from: mtdoc on November 10, 2013, 09:33:59 pmSince people seem to be having problems with the FLAC, I might try re-downloading it and doing it on my tek tonight. I wonder if media fire butchered the file.

author: lnx64
author_rank: Regular Contributor
timestamp: November 10, 2013, 10:00:24 pm
content: Quote from: BravoV on November 10, 2013, 05:04:22 pmI'll be doing it too soon, once I get the LM sync separator chip.There is, it'll take me some time to find the link though.. There's a bit of conversion that has to be done.