hybridfree/eevblog-posts huggingface dataset:
Pulse Height Analyzer based on Rigol DS2202A - Page 1
Forum section: electronics / general

author: ssackett
author_rank: Newbie
timestamp: September 04, 2017, 05:30:10 pm
content: I want to use my Rigol DS2202A Oscilloscope as a Pulse Height Analyzer. This will require some low level programming to produce the required functionality (see below). Does anyone know of prewritten software that accomplishes this, if so please send me references. Otherwise I am interested in knowing if there is a way, in terms of language support and other tools, to support writing such an application, if so please provide references and details.Description of Pulse Height Analyzer functionality-------------------------------------------------------Pulse height analyzers are used in Gamma Spectroscopy to sort gamma rays according to energy level. The technique to accomplish this is to digitize the input signal and use the number obtained for amplitude as a data value to create a histogram. The histogram is formed by dividing memory up into a set of bins each of which stores a particular energy value.The amplitude of the pulse generated by a gamma ray is proportional to its energy. The bins are used to accumulate the count of the number of gamma rays of a certain energy level. As counts accumulate the histogram that results is interpreted as the spectrum of the input gamma rays. This can be used indirectly to identify the specie of the atom emitting the gamma ray.The Rigol oscilloscope has several functional blocks that can in principle be used to construct a pulse height analyzer including input channels, digitizers and memory. What I want to do is write a program to repurposes these blocks to provide the function of a pulse height analyzer.Thanks for your help,Steve

author: thm_w
author_rank: Super Contributor
timestamp: September 05, 2017, 09:21:09 pm
content: You can't write programs on the rigol itself like that, as far as I can think of.You will need to use something like python, matlab, etc. to grab a chunk of sample memory from the scope (USB/ethernet), analyze it on the PC, then repeat. You will have a lot of dead time, but up to you if that matters. You can find some samples of communicating with the scope on this forum.Depending on the bandwidth you could use a DAQ, raspberry pi with external ADC, etc. to do this as well.

author: H.O
author_rank: Frequent Contributor
timestamp: September 06, 2017, 06:17:56 am
content: How wide are the pulses and at what frequency do they "appear"?If they're wide enough for a multimeter to measure then perhaps using the scope to trig and view the pulses and connect the trig out of the scope to a multimeter with histogram function to measure and plot the data?Or, it might be easier to log data with the multimeter and then export to a PC to perform the binning and histogram.If you want to use the scope alone then, as thm_w, says you're going to have to resort to Python or some other environment and talk to the scope that way.
Neutral Wire Explained  3 Wire Single Phase System - Page 1
Forum section: electronics / general

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: September 03, 2017, 12:37:18 am
content: In the electricians world it's single phase, but in the electronics world it's 2 phase, 180° each leg to neutral/ground, clear and simple, I don't care what'cha call it.I've had this "debate"with electricians again and again, to no avail. They simply do not get "IT"Just try to connect the two opposite ends of a center tapped transformer together and find out what happens.Or safer take a 2 channel scope in reference to the center tap and see the 2 phases.

author: vk6zgo
author_rank: Super Contributor
timestamp: September 03, 2017, 01:25:28 pm
content: The standard term is "split phase", as "two phase" implies the use of two phases of a standard "3phase"system.(And, yes, this is used-- it is common in electric stoves in Western Australia).

author: dmills
author_rank: Super Contributor
timestamp: September 03, 2017, 03:52:58 pm
content: Two phase is also used for two 90 degree phases, a bit weird but it used to be a thing in some specialist applications.https://en.wikipedia.org/wiki/Scott-T_transformer

author: Benta
author_rank: Super Contributor
timestamp: September 03, 2017, 05:28:23 pm
content: "Split phase" is correct for 240 V centre-tapped systems, like in the US.Three-phase is well known, with 120 degrees between the phases.Two-phase has 90 degrees between the phases, and is the system originally proposed by Nicola Tesla. Not used anywhere to my knowledge.Using two phases from a three-phase system isnota two-phase system, but just a convenient wiring in certain cases.

author: Zero999
author_rank: Super Contributor
timestamp: September 03, 2017, 06:03:32 pm
content: Quote from: Benta on September 03, 2017, 05:28:23 pmYes, it's actually single phase, if there's no neutral, or three phases if there is a neutral, just with a missing phase, which can be e generated with a transformer.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: September 05, 2017, 12:18:13 am
content: I don't care what it's called in the "industry" it's still 2 phase.Meanwhile this fucktard never heard of the words "Arc Flash"Full video:Here for the idiocy:https://youtu.be/vOh2OSJ44eE?t=429But after all he's a Samurai Repairman

author: Benta
author_rank: Super Contributor
timestamp: September 05, 2017, 10:25:03 am
content: QuoteA comma would have been useful, otherwise this has two different meanings.

author: Zero999
author_rank: Super Contributor
timestamp: September 05, 2017, 10:35:19 am
content: As mentioned above, the correct term for AC from a transformer with a centre tap, is split phase. Two phase is 90o. It doesn't matter what electricians often call it. Common usage isn't always technically correct.
Dave's PCB Design Book ??? - Page 1
Forum section: electronics / general

author: alin_im
author_rank: Regular Contributor
timestamp: September 05, 2017, 06:23:42 pm
content: Hey guys,Any idea if Dave's is going to ever publish the PCB Design book (- 10:10) that he started many years ago ?If not, do you know a good book for designing PCBs ? Maybe one that also includes high speed techniques and PCB components like inductors / capacitors ?

author: stmdude
author_rank: Frequent Contributor
timestamp: September 05, 2017, 07:05:04 pm
content: It's not really a book, but this excellent document taught me a lot about high-speed design:http://docs.toradex.com/102492-layout-design-guide.pdf

author: alin_im
author_rank: Regular Contributor
timestamp: September 05, 2017, 08:02:20 pm
content: Do you think Dave was talking about this onehttp://alternatezone.com/electronics/files/PCBDesignTutorialRevA.pdf

author: alin_im
author_rank: Regular Contributor
timestamp: September 05, 2017, 08:06:43 pm
content: Nope, the PDF is published in 2004 and video 2013 so nope it is not the one he was talking about.

author: EEVblog
author_rank: Unknown
timestamp: September 05, 2017, 10:16:00 pm
content: Nope, I got a few chapters in gave up. NO plans to revise it.Vincent Himpe (free_electron on the forum) was working on one, and IIRC was maybe 70-80% done, but then started a job at Tesla, and well, they expect you to devote your life to them.I do recall that he posted a chapter index on here once, and it was very similar to what my book was going to cover.
Teardown and Repair of a Fluke 97 Scopemeter - Page 1
Forum section: electronics / general

author: diegoperez
author_rank: Contributor
timestamp: September 04, 2017, 09:59:48 pm
content: Hello everyone,Today I posted a video of a teardown and repair of a Fluke 97 Scopemeter which seemed to be completely dead and I'd like to share it with you.As always, any suggestions and questions will be welcomed.Thanks for your attention.https://youtu.be/lqKZyw3BScgPS, I also link here two previous videosHP4275a LCR meterhttps://www.eevblog.com/forum/chat/teardown-and-repair-of-an-hp4275a-lcr-meter/HP6622a System PSUhttps://www.eevblog.com/forum/chat/a-look-at-an-agilent-6622a-system-dc-psu/msg1187146/#msg1187146

author: joeqsmith
author_rank: Super Contributor
timestamp: September 04, 2017, 10:16:00 pm
content: That scope looks very clean. Are the gaskets still all in good shape? Hope that swapping the IC brings it up.

author: diegoperez
author_rank: Contributor
timestamp: September 05, 2017, 05:59:57 pm
content: Quote from: joeqsmith on September 04, 2017, 10:16:00 pmYes, they are reasonably ok. But one thing I don't like is the very low contrast of the LCD. I don't know if new was the same or it has faded with time...

author: marshallh
author_rank: Unknown
timestamp: September 05, 2017, 09:55:03 pm
content: Same spinach green screen filters as the Game Boy. The LCD is actually a blue color. You can invert the data, rotate the polarizer 90 degrees and put a light panel under it and you'll be astounded how much more usable it'll be.
Texas Instruments DIY Opamp Evaluation Module - Page 1
Forum section: electronics / general

author: Syntax_Error
author_rank: Regular Contributor
timestamp: September 04, 2017, 02:59:27 am
content: These look extremely useful:Here is the product page:http://www.ti.com/tool/DIYAMP-EVM?HQS=asc-amps-pramps-diyamp_evm-bs-evm-null-eu&DCM=yesNot just for prototyping, but for direct inclusion into hobby projects. I haven't seen anything quite like this in concept before. I really like the panelized "coupon" design, and the promise of predesigned boards. Thinking of it from a "maker" perspective, I'd love to build off of a platform like this, as it offers to alleviate many PCB-design headaches for analog circuits delivering more than mediocre performance.Just wanted to share, and probe the community for thoughts, experience, and alternatives, etc. I am ordering the SOIC and SOT23 panels.
Dave, any chance of a visit to the upgraded Terrey Hills radar? - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: September 03, 2017, 04:20:06 am
content: This is more of a suggestion for another one of Dave's "visits to places" videos.This month, the Australian Bureau of Meteorology is upgrading theSydney Doppler radar. I don't know if there is much demand on here for a video from a weather radar site but I would certainly find it interesting. Perhaps Dave could approach the BOM and get us a sneak-peek inside the upgraded site?

author: Brumby
author_rank: Unknown
timestamp: September 03, 2017, 04:42:59 am
content: I would think he would have a better chance of getting up inside the radome with the radar non-operational.Would be good if he had a technician who knows how to explain things as a guide.
www.ebaman.com Who owns it? Having problems with it. - Page 1
Forum section: electronics / general

author: xwarp
author_rank: Frequent Contributor
timestamp: September 02, 2017, 11:01:16 am
content: Someone here owns this site if I recall correctly. I can not seem to register an account or even pull up the account I am sure I created a while back.Thanks!

author: H.O
author_rank: Frequent Contributor
timestamp: September 02, 2017, 02:13:56 pm
content: I "know" the owner from a Swedish forum I visit frequently, I don't know if he's hanging around here under another nick.I don't have an email address but I can PM him yours on the Swedish forum and ask him to email you - if you want me to.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: September 03, 2017, 12:17:15 am
content: Seems to have ha a history of being hacked. Maybe it was hit again?http://www.ebaman.com/index.php/news/16-latest/17-ebaman-got-hacked

author: tautech
author_rank: Super Contributor
timestamp: September 03, 2017, 12:31:18 am
content: Working fine ATM, logged in and out.http://www.ebaman.com/index.php
Magic Smoke Release - Page 1
Forum section: electronics / general

author: andersjm
author_rank: Contributor
timestamp: September 02, 2017, 09:32:37 am
content: Hi forum,Thought I'd share some pictures I took of the circuit board in a fluorescent light fixture that stopped working in our house. We got a new one under warranty, but since I was curious why the old one stopped working, I disassembled it.I can't really see which component blew. could it be the transformer?High res images:http://andersmusikka.se/burn/whole_product.jpghttp://andersmusikka.se/burn/whole-burn.jpghttp://andersmusikka.se/burn/burn-detail1.jpghttp://andersmusikka.se/burn/burn-detail2.jpg

author: andersjm
author_rank: Contributor
timestamp: September 02, 2017, 09:45:00 am
content: Looking at it a bit more, it seems like the thin L-shaped trace close to the mains input has blown.Could they have been using a thin trace as a sort of cheap fuse?I checked out the diode bridge, it seems to work. The transformer-like-thing (which I think is actually some kind of input filter) also seems okay.Well, I'm not going to attempt any repair, just curious why it failed.

author: Ian.M
author_rank: Super Contributor
timestamp: September 02, 2017, 11:31:22 am
content: Either something has gone dead short on the output side of the bridge (or the input filter cap shorted), blowing the 'fuse' track, or the 'fuse' track blew on a switch-on surge. The plasma then triggered an arc across between L and N, which probably tripped your breaker.Check the filter cap and the chopper transistor. If neither are shorted, repair could be as simple as cleaning the board and fitting a single strand of tinned copper wire of an appropriate diameter to replace the fuse track. Seehttp://www.gxk.org.uk/info/wire.htm. If the chopper transistor is shorted, its probably BER, as they often take out the control chip when they blow.
What was the first camera phone? Do you think they knew what was to come? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: September 01, 2017, 02:39:20 am
content: Who said "Hey lets take a shitty VGA camera and try to make it put out of focus pictures on a tiny LCD screen? That way in the future we can hold law enforcement in the US to new level of culpability!"and with that the first camera phone was born.

author: Ampera
author_rank: Super Contributor
timestamp: September 01, 2017, 04:00:46 am
content: It's really up to your definition of camera and phone.Bell labs created a "Video phone" that was supposed to use it's own specialized network. It cost absolutely too much, and the people who could afford it didn't like it.If you are talking portable, it would have to be in the 90's as CCDs didn't really become a thing until then.

author: bsudbrink
author_rank: Frequent Contributor
timestamp: September 01, 2017, 03:59:11 pm
content: Arguably, the first solid state digital camera. Definitely, the first consumer available solid state digital camera:

author: Vtile
author_rank: Super Contributor
timestamp: September 01, 2017, 06:30:07 pm
content: The first mobile seems to be by Sharp in Japanese markets. I had one Sony-Ericson camera phones back in 2004-2005 totally useless device, the Wolfenstein 3D had more photorealism and resolution. That 5110 were my first phone back in the days. There were all sorts of phone hacks* floating around between teenagers back then as always someone had family member in Nokia or phone service provider ranks.* Phone jamming sms messages, free messages / calls from somewhere deep down from the service mode etc. etc. Funny times.PPS. I remember from that era a one case where Nokia had a battery model that took fire in random cases. What a hell it did arise and they solved the problems. Then ten years later no-one seems to care that Iphones et al were catching fire in normal use.

author: Beamin
author_rank: Super Contributor
timestamp: September 01, 2017, 10:33:22 pm
content: Quote from: Vtile on September 01, 2017, 06:30:07 pmwhen its not spying on you its burning your leg and pubic hair off. Meh...
Which energy meter??? - Page 1
Forum section: electronics / general

author: snipersquad100
author_rank: Frequent Contributor
timestamp: August 31, 2017, 02:24:27 pm
content: I got some solar panels which are connected to the grid via micro inverters. I also have a small energy monitor to see how many watts are passing through the meter. The problem i have is I don't know when I'm using power from the grid or when I'm putting energy on to the grid.Does anyone know of a cheap monitor that tells you which direction the current is flowing.thank you.

author: Benta
author_rank: Super Contributor
timestamp: August 31, 2017, 05:52:54 pm
content: Single-phase or three-phase?

author: snipersquad100
author_rank: Frequent Contributor
timestamp: August 31, 2017, 06:16:18 pm
content: Single phase

author: Gregg
author_rank: Super Contributor
timestamp: September 01, 2017, 03:41:45 am
content: I would suggest an old school zero center analog meter, but that might make me seem old or something.
A spoof? How can a 3 meter PCI-E riser extension work? - Page 1
Forum section: electronics / general

author: Cliff Matthews
author_rank: Unknown
timestamp: September 01, 2017, 12:14:45 am
content: Holy digital delay batman! (just kidding..) This guy's been known to pull stunts before, but how can this work?

author: Ampera
author_rank: Super Contributor
timestamp: September 01, 2017, 12:22:55 am
content: They stated that those cables are shielded in some way, possibly from each other, meaning that the disturbance from high signal rates doesn't affect the other conductors. My guess (which they guessed too) of why they couldn't go LONGER is that eventually the very low current signaling power ended up becoming too weak for the card to read anything anymore. PCI-E works in a way that makes long range communication not as much of an issue as with standards like PCI or ISA. Each lane is it's own separate serial connection, that sends it's data on it's own clock irregardless of the other lanes, so there is no issues with traditional parallel latency. This means you could technicaly go as long as you want. This is the main reason why Thunderbolt exists. Thunderbolt is just PCI-E in a fancy package.
Is it possible to modify Windows Alt codes? - Page 1
Forum section: electronics / general

author: Ampera
author_rank: Super Contributor
timestamp: August 31, 2017, 08:41:03 pm
content: What I mean is the Alt+xxxx codes which I am fairly certain go up to the thousands. I would like to add Russian Cyrillic characters as I am somewhat learning Russian (that learning is on hiatus, never really got far with it anyways) so I don't have to change my keyboard layout or use my Russian keyboard.

author: Ian.M
author_rank: Super Contributor
timestamp: August 31, 2017, 09:30:30 pm
content: http://www.fileformat.info/tip/microsoft/enter_unicode.htmMethod 5 works. However you *MUST* choose *exactly* the language and keyboard layout it tell you to when setting it up, and for the Left_Alt + Shift keyboard shortcut to be enabled for 'Switch between input languages' and you need the MS Language bar enabled on your taskbar. Also it gets messy if you have a second language already installed as the Left_Alt + Shift shortcut selects the next one in order, so you may be better off setting separate shortcuts to switch to Chinese (Unicode) and back to your native language.

author: Cliff Matthews
author_rank: Unknown
timestamp: August 31, 2017, 11:31:52 pm
content: MaybeMicrosoft Keyboard Layout Creator v1.4can help.. I haven't time to play and see if alt-codes would be affected.**editMicroslop doesn't list anything past Vista as being supported, YMMV but it seems to work here:

author: Ampera
author_rank: Super Contributor
timestamp: September 01, 2017, 12:16:12 am
content: Quote from: Ian.M on August 31, 2017, 09:30:30 pmActually unicode input from the first method WOULD solve my problems, however it doesn't work. I have EnableHexNumpad set to 1 as a REG_SZ in HKEY_CURRENT_USER/Control Panel/Input Method in my system registry, but it still doesn't work.The decimal code for the ? in Unicode is 1046, yet when I hold alt and the plus key on the numpad and enter in 1046 I get a ? (Not sure if you can see it, it's just a box drawing line, SMF might not like my special character) It works fine for characters in the regular MDA style character set, but nothing else.Not sure what I am doing wrong here, I am using Server 2016 (Basically Windows 10 with less fluff).
Watch out for Microsofts - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: August 23, 2017, 05:06:06 am
content: This is another in my series of amusing (photoshopped) roadsigns in Victoria Australia. This one from a trip to Melbourne last week.

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: August 23, 2017, 05:28:53 pm
content: More likely, an android can kill in seconds.Not talking about a Cyberdyne Systems product either. Driver with head bent down over phone.

author: Ampera
author_rank: Super Contributor
timestamp: August 23, 2017, 06:06:43 pm
content: Quote from: IanMacdonald on August 23, 2017, 05:28:53 pmI'd think owners of Windows Phone would be more likely to die, but from a self inflicted gunshot wound to the head.

author: TerraHertz
author_rank: Super Contributor
timestamp: August 24, 2017, 07:05:00 am
content: Quote from: TwoOfFive on August 23, 2017, 06:06:43 pmThis is getting closer to why I think my photoshop is funny. But not just MS phones, and not just since they went to the 'software rental model', aka perpetual robbery, spyware and abuse model.

author: Ampera
author_rank: Super Contributor
timestamp: August 24, 2017, 04:52:02 pm
content: Quote from: TerraHertz on August 24, 2017, 07:05:00 amWelcome to capitalism, how may we exploit you today?

author: free_electron
author_rank: Super Contributor
timestamp: August 24, 2017, 05:18:34 pm
content: for the french :los angeles

author: R005T3r
author_rank: Frequent Contributor
timestamp: August 30, 2017, 01:10:04 pm
content: During a recent trip I spotted this signal... I simply coudn't belive there was a place called that way, not to mention the "Electronic velocity control" sing!

author: Zero999
author_rank: Super Contributor
timestamp: August 30, 2017, 01:40:34 pm
content: Quote from: R005T3r on August 30, 2017, 01:10:04 pmThat's nothing, for odd place names, check out Fucking, Austria.https://www.google.co.uk/maps/place/5121+Fucking,+Austria/@48.0558917,12.8101432,13z/data=!4m5!3m4!1s0x4775d4854dbcba19:0x802456ee60b72a17!8m2!3d48.0673299!4d12.8633177
Hawkins Electrical Guide - Page 1
Forum section: electronics / general

author: amyk
author_rank: Super Contributor
timestamp: October 09, 2016, 03:53:11 pm
content: For those interested in vintage electrical stuff, these might make for some good reading material:https://en.wikipedia.org/wiki/Hawkins_Electrical_GuideThere was a site with some of the first few volumes but it's gone offline; nonetheless, it remains in the archive:http://web.archive.org/web/20150321004005/http://www.hawkinsonline.org/vols

author: amyk
author_rank: Super Contributor
timestamp: August 29, 2017, 07:27:46 pm
content: I've found some acceptable scans of the whole set from 1917 here:Code:http://www.librum.us/stacks1/heg01-1917.exehttp://www.librum.us/stacks1/heg02-1917.exehttp://www.librum.us/stacks1/heg03-1917.exehttp://www.librum.us/stacks1/heg04-1917.exehttp://www.librum.us/stacks1/heg05-1917.exehttp://www.librum.us/stacks1/heg06-1917.exehttp://www.librum.us/stacks1/heg07-1917.exehttp://www.librum.us/stacks1/heg08-1917.exehttp://www.librum.us/stacks1/heg09-1917.exehttp://www.librum.us/stacks1/heg10-1917.exeSave for the annoying watermark (these books are now public domain), the quality is pretty good overall and it's a complete set. They are unfortunately an EXE with an embedded PDF, so if you're scared of unknown executables and/or can't run them for whatever other reason, let me know and I can upload the extracted PDFs somewhere --- they're 1.36GB in total.

author: tooki
author_rank: Super Contributor
timestamp: August 30, 2017, 11:42:23 am
content: I'd be interested, as a non-Windows user.

author: TerraHertz
author_rank: Super Contributor
timestamp: August 30, 2017, 12:29:30 pm
content: Lots of reprints, and a few originals available:https://www.abebooks.com/servlet/SearchResults?bsi=0&sortby=17&tn=Hawkins+electrical+guideFor the originals, skip to later pages of listings. I couldn't see anyone with a complete set to sell though.
What did you buy form china today? Post your recommendations and ... - Page 1
Forum section: electronics / general

author: ulix
author_rank: Regular Contributor
timestamp: August 29, 2017, 08:20:08 pm
content: Hi,I like the "What did you buy today? Post your latest purchase!" very much. Now I was thinking this would be a good thing to have this for our china purchases (from ebay, alibaba, aliexpress, Taobao and what etc..).Are there products you could recommend and products we shouldn't buy?If possible, pictures would be appreciated.(please don't use this thread to rant about made in china products)My recommendations,widely discussed here and Dave's as well: Hot Air Reworkstation 858d, ESR Meter (self build kit) and Andostar USB Microskope A1What I recommend (&bought):-Tweezers stainless steel, black coating (preferred from she.k)-Solder Paste Knife made of stainless steel (JM-Z12)-USB Endoscope-USB Volt-/Ammeter (white case, has micro usb Power_in or USB_A and Power_out is USB_A as well)-krapton tape works for my liking as wellI wouldn't recommend:- Solderpaste from Mechanic lead-free, some have bismuth content and the residue of the flux is so sticky, hard to clean with isopropanol
Rigol on aliexpress? - Page 1
Forum section: electronics / general

author: apelly
author_rank: Unknown
timestamp: August 29, 2017, 04:49:00 am
content: Just got some marketing wank from Rigol. It was to point this out:https://rigol.aliexpress.com/store/2795184?spm=2114.12010108.0.0.7d847a7SJ9rysHaven't looked at the prices. But WTF?

author: sleemanj
author_rank: Super Contributor
timestamp: August 29, 2017, 05:08:10 am
content: Why do you feel this is a WTF? Rigol is a Chinese company, lots of Chinese companies direct-sell to the public and Aliexpress is the best way to do that for foreign buyers.

author: apelly
author_rank: Unknown
timestamp: August 29, 2017, 05:28:38 am
content: Quote from: sleemanj on August 29, 2017, 05:08:10 amBecause it's taken them years to do it. And their stuff is notoriously difficult to get hold of direct from China for some, presumably deliberate, reason.Maybe I should have said "That's an interesting development..."Their email came with the fine print:QuoteWhich is no doubt to appease their distributors. No love for Emona though, it would seem.

author: BradC
author_rank: Super Contributor
timestamp: August 29, 2017, 07:33:37 am
content: Quote from: apelly on August 29, 2017, 05:28:38 amA 10 second comparison of the DS1054z shows Emona are only a gnats more expensive. So probably not worth arguing over.
"the Boy Electrician" PDF - A very old book of electrical experiments - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: August 21, 2017, 08:17:54 pm
content: I have wanted this book for years ever since I saw it in a truly great used bookstore in Mountain View, CA. (just a stones throw from NASA Ames Research Center) a store that was really unique, I realize, sort of a Mecca for used technical books needing good homes, and which tragically, no longer exists.Foolishly, I didn't buy it.http://www.tayloredge.com/museum/museum/TheBoyElectrician.pdf

author: tggzzz
author_rank: Super Contributor
timestamp: August 21, 2017, 08:46:01 pm
content: That's one version; there are quite a few. Somewhere I have one from the 1930s, plus another very similar book with, IIRC, a different title.Amazon is your friend.

author: TerraHertz
author_rank: Super Contributor
timestamp: August 23, 2017, 03:04:56 pm
content: There are reprints available.https://www.abebooks.com/servlet/SearchResults?sts=t&an=Alfred+P+Morgan&tn=the+boy+electrician&kn=&isbn=No idea what the quality is like. But it can't be worse than that pdf. Urrgh. Random skew, miserably poor saturation, specks galore, encoded in lo-res JPG with all its artefacts... no fun to read at all. Just another example of incompetent scanning.Such a shame, the book is interesting.Here's an illustration that deserves to be on 'show us your workbench'.

author: Electro Detective
author_rank: Super Contributor
timestamp: August 28, 2017, 10:12:40 am
content: Picture above looked like a DJ, spinning mindless monotonous racket masquerading as music today..thankfully not!!!

author: BradC
author_rank: Super Contributor
timestamp: August 28, 2017, 12:05:52 pm
content: Quote from: TerraHertz on August 23, 2017, 03:04:56 pmAgree on the scanning, but it's better than a number of scanned Textronix manuals I have (even one published by Tek themselves!)

author: Kjelt
author_rank: Super Contributor
timestamp: August 28, 2017, 02:22:49 pm
content: Quote from: cdev on August 21, 2017, 08:17:54 pmThere are multiple originals from different decades for sale on Ebay.

author: Electro Detective
author_rank: Super Contributor
timestamp: August 28, 2017, 11:31:35 pm
content: The PDF is very readableand the right priceThere's enough quality there to do a makeover if anyone wants to play with a PDF Editor, to pump up some contrast and tilt a few pages etcThanks cdev
Flux Capacitor - Page 1
Forum section: electronics / general

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 16, 2017, 08:11:36 am
content: Seen on Facebook:http://www.oreillyauto.com/flux-capacitor.htmlTim

author: cjones
author_rank: Newbie
timestamp: August 26, 2017, 11:20:57 pm
content: I just saw an older model on craigslist.https://salem.craigslist.org/for/d/flux-capacitor-generator/6270104727.html

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: August 27, 2017, 02:24:42 am
content: "Yes but this version only generates the flux-capacitor. It is not the actual unit sir if you had read my original posting. Sorry there are no guarantees. You must have hooked it up wrong"Quote from: cjones on August 26, 2017, 11:20:57 pm

author: bjcuizon
author_rank: Frequent Contributor
timestamp: August 27, 2017, 03:00:23 am
content: Here's my contribution to the topic:https://www.jaycar.co.nz/flux-capacitor/p/OUTATIME

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: August 27, 2017, 05:47:34 am
content: I'm returning this flux capacitor as overpriced. After all you have a notice saying that I can return anything for a refund, that I can find at least $10 cheaper elsewhere."Yes we do make that offer, but as the only supplier of flux capacitors in the world, I don't see how you can get one cheaper."Here is a receipt, with your own trademark on it"-Huh?"In 2040 you will be selling them for $250 instead of $200,000.

author: bjcuizon
author_rank: Frequent Contributor
timestamp: August 27, 2017, 06:01:06 am
content: Quote from: IanMacdonald on August 27, 2017, 05:47:34 amHow could he buy it in the first place??? It'sOUT OF STOCK.

author: jonovid
author_rank: Super Contributor
timestamp: August 27, 2017, 06:48:58 am
content: need one for a teardown

author: Electro Detective
author_rank: Super Contributor
timestamp: August 27, 2017, 09:37:24 am
content: "Assembly required""Time Travel at your own RISK!!!"No Arduino, USB or Bluetooth interfaceEbay Seller with zero FeedbackMight give it a miss for now guysunless the situation improves by yesterday

author: Moshly
author_rank: Regular Contributor
timestamp: August 27, 2017, 10:12:18 am
content: meh, totally useless without the accompanying electrostatic inductor

author: TimFox
author_rank: Super Contributor
timestamp: August 28, 2017, 04:49:21 pm
content: I still need an interocitorhttps://www.pinterest.com/pin/109916047126588264/
IT technician - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: August 27, 2017, 05:26:52 pm
content: NOTE: This message has been deleted by the forum moderator gnif for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: GreyWoolfe
author_rank: Unknown
timestamp: August 27, 2017, 07:37:08 pm
content: I sure hope that this is a late April Fool's joke. If not, banning is necessary.

author: A@ron
author_rank: Contributor
timestamp: August 27, 2017, 07:51:51 pm
content: mods asleep, post about currency counterfeiting?

author: Halcyon
author_rank: Unknown
timestamp: August 27, 2017, 08:20:17 pm
content: Quote from: TonyBill on August 27, 2017, 05:26:52 pmBefore this thread gets deleted, I just wanted to make the comment that the Australian Mint should look into using "Methalic" ink. They are so far behind the times ;-)EDIT: Gees gnif, you're up early. Good morning.

author: gnif
author_rank: Unknown
timestamp: August 27, 2017, 08:22:55 pm
content: Quote from: Halcyon on August 27, 2017, 08:20:17 pmNope, just up really really late...

author: Halcyon
author_rank: Unknown
timestamp: August 27, 2017, 08:24:20 pm
content: Quote from: gnif on August 27, 2017, 08:22:55 pmAhh, well, pleasant dreams then.
Opinions on Aussie Post ShopMate - Page 1
Forum section: electronics / general

author: BradC
author_rank: Super Contributor
timestamp: August 28, 2017, 05:35:13 am
content: I want to buy some extra Tek TM500 plugins. The units I'm after generally go on E-bay for between $25 & $60 each. No worries. Unfortunately the E-bay Global Shipping program means each plugin has an extra $50-$70 shipping on it.If I take 3 plugins I have here as an example, I have 3Kg of actual weight, or 2.3Kg of "cubic weight" as per Aus-Post. So I'd be looking in the order of $50-70 shipping total for the 3. That makes purchases like that considerably more attractive than the Ebay GSP.I used to use Bongo to consolidate and forward with great results, but they've since been bought out by FedEx and their rates aren't as good as they used to be. Has anyone used ShopMate and what sort of service did you receive?
SMD code in through hole component? - Page 1
Forum section: electronics / general

author: jesuscf
author_rank: Frequent Contributor
timestamp: August 26, 2017, 11:26:27 am
content: Yesterday I received some parts from DigiKey. One of the parts I ordered is a 4.096V voltage reference in a TO-92 package, the LM4040, originally made by National Semiconductors. As you probably know, National Semiconductors was acquired recently by TI. The device markings when the part was made by National Semiconductor are along the lines of "4040A1Z4.1". Now that the part is made by TI the markings says "NFD41I". After googling this mysterious code, it turned out that it is a SMD code (I think) for TI part number LM4040D41ILPR. Nowhere in the markings the "4040" is printed, although there seems to be plenty of space for printing in the TO-92 package. Anybody knows if this is this normal, given that the part I bought is not a SMD? From the datasheet it seems that TI is using this cryptic markings for all their LM4040 devices, SMD or not.

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2017, 12:12:51 pm
content: Grab the datasheet and check "Device marking".

author: jesuscf
author_rank: Frequent Contributor
timestamp: August 26, 2017, 12:39:51 pm
content: Quote from: tautech on August 26, 2017, 12:12:51 pmHow is this answering my question? Also, read the last sentence of my post.

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2017, 08:52:15 pm
content: Quote from: jesuscf on August 26, 2017, 12:39:51 pmSo before you ordered you had the datasheet and knew how the part should be marked, right ?Rather than use Google why didn't you get and link the datasheet in this thread ?Google search for LM4040 brings up this as the first hit:http://www.ti.com/lit/ds/symlink/lm4040-n.pdfPages 44-48 has the package markings for TO92 and indeed none match what you have received.The only answer to your question without spending lots of time will be from Digikey......your supplier.They need email you the datasheet that proves the part they provided is correct.

author: jesuscf
author_rank: Frequent Contributor
timestamp: August 26, 2017, 10:28:18 pm
content: Quote from: tautech on August 26, 2017, 08:52:15 pmAllow me to explain again with fewer and simpler words so you can understand: marking used to be 4040A1Z4.1; now it is NFD41I. Is it a new trend to put SMT markings in THT parts even though there is enough space to write a sentence?

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2017, 11:02:54 pm
content: Quote from: jesuscf on August 26, 2017, 10:28:18 pmNot in my experience, contact Digikey and/or TI for further explanation.As I hoped you might've taken on from my first reply, the manufacturer's datasheet for any product is the bible you must work with....unless there's a later version that's not obvious to find. Check TI's and Digikey's website.Send them both emails.......they've both got customer support staff.......you're their customer.Report back your findings so we can all hope to learn something new or not.
Multimeters in the Machinist shop. - Page 1
Forum section: electronics / general

author: Kryoclasm
author_rank: Regular Contributor
timestamp: August 26, 2017, 06:23:05 pm
content: Very informative video on how machinists use multimeters. I never knew these cool tricks!

author: Zero999
author_rank: Super Contributor
timestamp: August 26, 2017, 08:25:14 pm
content: When was this made? April 1st?

author: Kryoclasm
author_rank: Regular Contributor
timestamp: August 26, 2017, 11:10:02 pm
content: Looks like Mar 31, last year.

author: Melt-O-Tronic
author_rank: Frequent Contributor
timestamp: August 27, 2017, 04:47:53 am
content: That's how This Old Tony does it. All his videos have at least some of that sense of humor in them, although most are predominately practical. The highlight of my week is a notification of a new This Old Tony video.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: August 27, 2017, 06:04:16 am
content: I started watching his videos about a month ago. He really has his own style.Very dry humor that I love.

author: tooki
author_rank: Super Contributor
timestamp: August 28, 2017, 02:14:53 am
content: You're a day late, man!https://www.eevblog.com/forum/chat/dmm-in-the-workshop/
DMM in the workshop... - Page 1
Forum section: electronics / general

author: halexa
author_rank: Regular Contributor
timestamp: August 25, 2017, 09:56:32 pm
content: https://youtu.be/uFTQxWlMGeE

author: Avacee
author_rank: Unknown
timestamp: August 25, 2017, 10:23:10 pm
content: .. except he never mentioned keeping the probes sharp for Defibrillator mode :p

author: Ampera
author_rank: Super Contributor
timestamp: August 25, 2017, 10:30:50 pm
content: Who needs to save lives?I don't.I sharpen my DMM tips to roast marshmallows over burning electronics.
Cellular salmon - Page 1
Forum section: electronics / general

author: Ampera
author_rank: Super Contributor
timestamp: August 26, 2017, 06:24:39 am
content: Dave retweeted this on his Twitter, but this is so amusing to me that I thought I had to throw it here.https://twitter.com/kc8apf/status/901186460820193280Of course it comes from FOX News.
ATN Channel 7 Sydney / Quantel Paintbox Oddity - Page 1
Forum section: electronics / general

author: dexters_lab
author_rank: Unknown
timestamp: August 22, 2017, 04:24:08 pm
content: I have just been working with one of my quantel paintboxes, specifically using Kryoflux to image some old 8" floppies and i just noticed a label on the drive which seems to be a ATN Channel 7 Sydney asset number!Looks like this drive used to be at Channel 7 Sydney, the drive is dated 1986bizarre though this drive supposedly came from BBC Elstree Studios here in the UKstrange how tech gets moved all around the world!

author: Halcyon
author_rank: Unknown
timestamp: August 22, 2017, 11:03:23 pm
content: How do you find the Kryoflux by the way? I've been looking at getting one.

author: SL4P
author_rank: Super Contributor
timestamp: August 23, 2017, 01:18:17 am
content: Probably swapped / traded-in by Quantel - and ended up going back to UK as spares for other projects.Often we'd see UK tech support staff out here for installation / upgrade work.

author: dexters_lab
author_rank: Unknown
timestamp: August 23, 2017, 05:57:20 am
content: Quote from: Halcyon on August 22, 2017, 11:03:23 pmit seems to be an excellent well thought out product, it does seem to be struggling with the quantel disks though but that's not really a fault on the kryoflux sidein it's stream preservation mode it will create what is best described as a bitmap image of the flux changes on the disk. This means you can make a perfect copy of it, whatever it's format. I don't believe any disk imaging tool has done this before.It can also decode and create binary data images of the disks with profiles detailing FM/MFM encoding, RPM, sector numbers, sizes etc, which create image files like you'd normally expect.The problem we have with the quantel disks is if you want Kryoflux to do the MFM decoding then it will look for sectors, but the quantel disks are not sectored so it won't give us any data. We're hoping we can tell kryoflux not to do anything fancy and just MFM decode the track(s) for us. I'll have to see what their community says.It's biggest annoyance to me is it needs Java Runtime if you want to use the GUI

author: Halcyon
author_rank: Unknown
timestamp: August 23, 2017, 11:03:04 pm
content: Thanks for that. On paper it does look like a very good product. It's just a shame that it doesn't come in a box as opposed to a bare board.

author: dexters_lab
author_rank: Unknown
timestamp: August 24, 2017, 08:37:57 am
content: yes lack of box is a bit of a shame
Why is the unit of Digital angular frequency radian not radian/s? - Page 1
Forum section: electronics / general

author: MrOmnos
author_rank: Frequent Contributor
timestamp: August 23, 2017, 03:41:20 pm
content: So, in most DSP books the digital angular frequency is radian. Shouldn't it be radian/s after all it is a frequency?

author: Jeroen3
author_rank: Super Contributor
timestamp: August 23, 2017, 04:00:21 pm
content: Because everything is referenced to the sample freqeuncy?
Ethical Exotic Pet (EEP) - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: August 21, 2017, 06:34:32 pm
content: https://hackaday.io/project/21627-ethical-exotic-pet-eep

author: Zbig
author_rank: Frequent Contributor
timestamp: August 23, 2017, 11:16:24 am
content: Cool and very steampunky. I wish I had its dance moves.
RS485 (modbus) to USB converter in Germany - Page 1
Forum section: electronics / general

author: J23
author_rank: Newbie
timestamp: August 23, 2017, 07:19:58 am
content: I'm currently in Bremen, Germany. Since I don't speak the language I have a trouble finding the device. If there is anyone who knows where I could buy it I would appreciate the help. Also a Siemens modbus card for ET200 might be handy.

author: AndyC_772
author_rank: Super Contributor
timestamp: August 23, 2017, 07:54:20 am
content: http://de.farnell.com/ftdi/usb-rs485-we-1800-bt/kabel-usb-rs485-ser-konv/dp/1740357?ost=1740357&searchView=table&iscrfnonsku=false&ddkey=http%3Ade-DE%2FElement14_Germany%2Fsearch

author: J23
author_rank: Newbie
timestamp: August 23, 2017, 07:59:04 am
content: I guess Farnell sells only online. I'm looking for a shop where I could just go and buy the thing.

author: Kjelt
author_rank: Super Contributor
timestamp: August 23, 2017, 08:22:44 am
content: Look for a ConradBorgwardstraße 228279 Bremenbut I am not sure if they have them in stock.https://www.conrad.de/de/filialen/filiale-bremen.htmlhttps://www.conrad.de/de/usb-seriell-kabel-usb-auf-rs422485-1000183.html
Unused computer's RTC seems to have kept going for 12 yrs w/o being plugged in. - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: August 24, 2017, 02:51:15 am
content: I have an old mini-server machine that I used to use a lot but due to its power supply dying its been unplugged for 12 years, as shown by its network configuration which was from my old home on the opposite coast. So I finally got around to wiring a new plug for it and booted it up. Its RTC must have been running all this time because it had the date right and thought the time was around 17:00 UTC when it was in reality around 23:00 UTC..It couldn't have gotten time from the network because it had not been connected to any network yet! (It has a serial port/console)Wow..

author: BradC
author_rank: Super Contributor
timestamp: August 24, 2017, 03:18:49 am
content: Not at all impossible. You probably got a "wednesday" RTC & Battery.

author: Halcyon
author_rank: Unknown
timestamp: August 24, 2017, 03:38:26 am
content: Quite common with those older RTCs. The old Dallas RTC chips with the built-in battery were rated for 10 years and often lasted longer.

author: Ampera
author_rank: Super Contributor
timestamp: August 24, 2017, 03:43:58 am
content: Quote from: Halcyon on August 24, 2017, 03:38:26 amThose thing suck when you gotta replace them tho, as nobody bothered to socket them. I'd take a CR2032 any day.

author: Halcyon
author_rank: Unknown
timestamp: August 24, 2017, 03:45:34 am
content: Quote from: TwoOfFive on August 24, 2017, 03:43:58 amLikewise, however I'd say at least half of those Dallas RTCs I've seen have been socketed, for example in the IBM PS/2 machines. It made replacement really easy and you can still buy new ones as drop-in replacements.

author: Ampera
author_rank: Super Contributor
timestamp: August 24, 2017, 04:35:51 am
content: How's the pinging program working?

author: rdl
author_rank: Super Contributor
timestamp: August 24, 2017, 04:47:17 am
content: Sat in a closet over 10 years and the clock was off by less than a minute. Modern computers, if not connected to a time server, you're lucky if they're with in a minute after a weekhttps://www.eevblog.com/forum/vintage-computing/what-was-the-very-first-computer-you-owned/msg1272450/#msg1272450

author: Halcyon
author_rank: Unknown
timestamp: August 24, 2017, 04:48:01 am
content: Quote from: TwoOfFive on August 24, 2017, 04:35:51 amI tweaked it a bit but does the job. It seems as though my internet connection has been stable over the past 3-4 weeks. Fingers crossed it stays that way!

author: Ampera
author_rank: Super Contributor
timestamp: August 24, 2017, 04:49:47 am
content: Quote from: rdl on August 24, 2017, 04:47:17 amMy HP48G's RTC is really inaccurate. It can go off by hours if left for a month or so.
Apollo 16 launch from T-20 with James Burke 1972 - Page 1
Forum section: electronics / general

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: August 22, 2017, 10:27:27 am
content: For some reason every link you post is invisible in my browser. Are you posting it differently than others? I'd like to view it!Added..even using the drag over the invisible text does not show it.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: August 22, 2017, 12:33:29 pm
content: For me, the links show up as a YouTube video directly embedded in the message. Do you get the same problem with all browsers? Which one do you use? Any blocking software?When composing the reply the video still does not show up, but the link does:://www.youtube.com/watch?v=g8jkjNdeEl8Just add "http".*Edit: removed "http" from link to prevent previewing.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: August 22, 2017, 10:52:41 pm
content: Bizarre at the least.. I use Mozilla and it works for everyone but his links.I tried your "quote the message" dealio, and viola!I can see the link....I only use Mozilla based non-spy browsers. And no need for blockers.Well at least part of the problem is solved, thanks.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: August 22, 2017, 11:12:26 pm
content: Regarding the audio.. "I said peak limiter not peak clipper!"