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do we need a separate surplus thread, or should i just megapost i will clue u all in about american science + surplus, electronics goldmine, fair radio sales
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Dec 24, 2014 02:28
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| # ? May 15, 2024 16:45 |
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Jonny 290 posted:do we need a separate surplus thread, or should i just megapost megapost
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Dec 24, 2014 02:30
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k, on it
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Dec 24, 2014 02:32
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Olivil posted:Tek 24xx series are v nice scope I have no idea to be honest, I'll have to check next time I'm underground. I just know it's a 2440, looks just like this guy's http://www.jvgavila.com/tek2440.htm Only dual channel though, the other gif I posted was a 4 channel tek (well... 3 channel now).
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Dec 24, 2014 02:34
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Mr. Despair posted:I have no idea to be honest, I'll have to check next time I'm underground. I just know it's a 2440, looks just like this guy's http://www.jvgavila.com/tek2440.htm nonetheless its a v good scope I was asking about the p11 (blue) phosphor because that's a cool option and your trace looks bluer than the one you linked (which is the standard p31, greenish phosphor) 290: release the megapost
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Dec 24, 2014 17:59
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for reference heres a 7904a mainframe with the P11 phosphor and heres a 7904a with the standard phosphor 
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Dec 24, 2014 19:46
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i'd like to get a hobby oscilloscope for learning some things on my own outside of school. i see things like the dso chinese things that have bad reviews but seem like a neat thing, or buy a used behemoth on ebay
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Dec 24, 2014 20:34
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Apocadall posted:i'd like to get a hobby oscilloscope for learning some things on my own outside of school. i see things like the dso chinese things that have bad reviews but seem like a neat thing, or buy a used behemoth on ebay yeah i've been i the same sitch for a while. i need to shut STFU and eat ramen for a month and buy one.
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Dec 24, 2014 20:36
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Buy the biggest, baddest tek you can.
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Dec 24, 2014 20:37
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Apocadall posted:i'd like to get a hobby oscilloscope for learning some things on my own outside of school. i see things like the dso chinese things that have bad reviews but seem like a neat thing, or buy a used behemoth on ebay Jonny 290 posted:yeah i've been i the same sitch for a while. i need to shut STFU and eat ramen for a month and buy one. similar. kindly report back because i really want to buy a reliable and cheap scope and love stories
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Dec 24, 2014 20:44
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I've used a cheap Chinese DSO thing at work a few times, it works fine for what it is the biggest thing is that it's only grounded through your computer's USB port. if you are on a laptop it is a floating ground and you'll need to take great care with something plugged into the wall or else you blow out the USB ports and likely your mobo. we only used it on with usb/FireWire powered peripherals so it was just fine
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Dec 24, 2014 20:55
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the usb ones are neat, someone makes some for tablets too, i think mostly kickstarters though for that idea
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Dec 24, 2014 20:55
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The quality's not good and it's 2 hours but you should all watch this and then buy an analog oscilloscope https://www.youtube.com/watch?v=8ZKMrzTGxLQ
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Dec 24, 2014 21:24
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http://www.rigolna.com/products/dig...bsyZRoCZGfw_wcB i got this one for $300 from a coworker, at least i think it's the 100mhz one and not the 50mhz, not remembering it has been extremely needs suiting as an intro scope, i have troubleshooted many a bus with it, it can log the data to a FAT thumb drive and do some basic FFT stuff as well research the UIs on digital scopes before you buy em because some are REALLY bad, said coworker sold it to me because he was getting a "better" one, which has a faster sample rate and stuff, but the UI is so bad that he regretted the hell out of it a cyberpunk goose fucked around with this message at 21:31 on Dec 24, 2014 |
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Dec 24, 2014 21:27
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i need one bad right now because we're about to build Radio Free YOSPOS and i need to troubleshoot HF RF circuits and filters
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Dec 24, 2014 21:28
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If you guys buy a cheap chinese scopes (Rigol DS1054Z for instance, honestly thats quite a good scope for the price), google around and you might find some keygens to upgrade your scopes for free like you can make your 400$ 50 MHz DS1054Z into a 830$ 100 MHz DS1104Z for free. because they all use the same board.
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Dec 24, 2014 21:31
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Olivil posted:If you guys buy a cheap chinese scopes (Rigol DS1054Z for instance, honestly thats quite a good scope for the price), google around and you might find some keygens to upgrade your scopes for free i have a rigol in this series :0
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Dec 24, 2014 21:32
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Mido posted:i have a rigol in this series :0 RIGLOL be warned that while you can "flash back" to your old software using a PC, i think you cant change back your model number (100MHz -> 50 MHz) thus voiding your warranty. So if you care about your warranty dont upgrade your frequency
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Dec 24, 2014 21:32
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Olivil posted:RIGLOL thanks for the pro tips, ill verify the model number and stuff when i get home
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Dec 24, 2014 21:34
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Jonny 290 posted:i need one bad right now because we're about to build Radio Free YOSPOS and i need to troubleshoot HF RF circuits and filters there's an extreme radio nerd in the projects thread
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Dec 24, 2014 21:38
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did someone say riglol
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Dec 24, 2014 23:50
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I really don't even know what an ossciloscope is or measures but it seems cool as hell
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Dec 25, 2014 01:19
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I don't even have a non-scrub-tier voltmeter
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Dec 25, 2014 01:40
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scrub-tier voltmeters/multimeters are great. I like having some beaters around. I have a really nice Fluke that I love but it's nice having some cheapos you can abuse without a care.
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Dec 25, 2014 01:51
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Captain Foo posted:I really don't even know what an ossciloscope is or measures but it seems cool as hell you hook up probes to the inputs you connect probes to loops or conductors you can now visually map the electrical characteristics of a conductor on a screen you can configure trigger points when certain edges or thresholds occur, so yo ucan capture pulses of logic happening at realtime for example you might have three bus lines, one clock, one data, one chip select when you program the SoC to send some data, it pulls chip select low, clock/data wobble around between 3.3v and 0v (or whatever signal voltage), when it's done transmitting it puts chip select back up at 3.3 to troubleshoot the data you can set up a trigger on the chip select line going high and leave the other line just watching data, you send the data, the scope triggers on that moment in time that the chip select line changed, now you can look at what happened
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Dec 25, 2014 02:02
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Mido posted:you hook up probes to the inputs imagine you're reading a circuits voltage, and simulatenously you're drawing with a pencil horizontally across a piece of graph paper at a constant speed. now while moving the pencil is moving horizontally at the constant speed, you move it vertically up or down to match how high or low the voltage is you're an oscilloscope!
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Dec 25, 2014 02:12
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Tin Gang posted:imagine you're reading a circuits voltage, and simulatenously you're drawing with a pencil horizontally across a piece of graph paper at a constant speed. now while moving the pencil is moving horizontally at the constant speed, you move it vertically up or down to match how high or low the voltage is move the pencil to the left the more pain you feel, back to the right the less you feel *hooks up electrodes* *starts paper conveyor*
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Dec 25, 2014 03:11
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Thanks to u both 
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Dec 25, 2014 03:24
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Captain Foo posted:Thanks to u both I feel oscilloscopes probably deserve better than to be described as just fancy voltmeters but I dunno
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Dec 25, 2014 04:11
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Oscilloscopes enable time domain visualization of electrical signals. The more you spend, the finer the time domain detail you can see. You can see both voltages and currents. Fancy models can do Fancy things, like frequency domain analysis or other complex maths.
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Dec 25, 2014 04:14
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Bloody posted:Oscilloscopes enable time domain visualization of electrical signals. The more you spend, the finer the time domain detail you can see. this is quite explanatory thank you
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Dec 25, 2014 04:38
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Bloody posted:Oscilloscopes enable time domain visualization of electrical signals. The more you spend, the finer the time domain detail you can see. You can see both voltages and currents. Fancy models can do Fancy things, like frequency domain analysis or other complex maths. no, gently caress scopes are window dressing when a cute lady comes over and sees your shelves of bench supplies and various scopes and your set of $1200 active probes and a mess of probes standing up out of test points on a board you are pretending to be debugging -- she will fall for you
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Dec 25, 2014 09:30
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Mido posted:no, gently caress when you move up to spectrum analyzers and storage scopes their clothes literally fall off right there
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Dec 25, 2014 10:23
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longview posted:when you move up to spectrum analyzers and storage scopes their clothes literally fall off right there Text me
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Dec 25, 2014 17:46
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longview posted:when you move up to spectrum analyzers and storage scopes their clothes literally fall off right there my scope has some storage  no real spectrum analyzer though, beyond some basic fft bullshit
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Dec 25, 2014 21:28
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no wonder im single
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Dec 25, 2014 21:29
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just found out about OSH Park, which does small-scale and very inexpensive PCB fabrication with a quick turnaround. I'd been worried a bit about this thing I want to do because at 10 MHz I expect it'd be over what would normally work well with breadboard, wire wrap, and so on. but this place is dirt cheap, and a couple people I trust recommended it. I also found what looks to be a decent inexpensive layout app to use with them. so how cheap is it?  per square inch per lot of three four-layer boards! (and half that for two-layer.)
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Dec 26, 2014 05:58
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Oshpark owns, use it a lot. Also, install diptrace
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Dec 26, 2014 06:11
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Also ten megs on a breadboard is going to be fine, your tenth order harmonics are still more than a meter and the parasitics will be irrelevant
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Dec 26, 2014 06:12
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| # ? May 15, 2024 16:45 |
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Jonny 290 posted:do we need a separate surplus thread, or should i just megapost surplus post would be a nice yosmas present any opinion on halted (HSC) vs the others? thinking of heading there tomorrow to buy poo poo, not just ogle it.
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Dec 26, 2014 06:13
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