hybridfree/eevblog-posts huggingface dataset:
From schematic to assembled board - Page 1
Forum section: electronics / general

author: Bryan
author_rank: Frequent Contributor
timestamp: September 20, 2020, 11:42:55 am
content: All:Watching this utube video on how quickly one can go from schematic to assembled board using a pcb service. I found it amazing how it all comes together.https://youtu.be/qXWYXxDokv4

author: S. Petrukhin
author_rank: Super Contributor
timestamp: September 21, 2020, 12:07:32 am
content: It is convenient to use the free EasyEDA to develop simple and medium-complex PCB designs. It is very close to KiCad in management.There is a very important and pleasant feature of EasyEDA: you can draw a schematic by installing real components, selecting them from their LCSC database, while controlling their price, availability on stock balances, and always at hand a datasheet. But the best part is that all the components that you used in the scheme will already receive a footprint and silkscreen when imported to the PCB. And when you complete the PCB design, you can order the production of PCB and the supply of components at a reasonable price (without inflating the price by famous sales monsters) in a couple of clicks. You can also get BOM and Gerber files for other production.

author: Bassman59
author_rank: Super Contributor
timestamp: September 21, 2020, 04:09:47 am
content: Quote from: S. Petrukhin on September 21, 2020, 12:07:32 amWhat happens when the parts you need are not in the LCSC database?

author: S. Petrukhin
author_rank: Super Contributor
timestamp: September 21, 2020, 04:18:05 am
content: Quote from: Bassman59 on September 21, 2020, 04:09:47 amAs in any other program, you can add it yourself. At the same time, you can use ready-made footprints of standard cases or search for those made by other people.You can set a different supplier (for example, Mouser or Farnell) in the parameters and this will be displayed in BOOM so that it is convenient to divide it by supplier.
LBRY have launched Odysee  - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: September 19, 2020, 10:54:28 am
content: LBRY have launched Odysee, a look'n'feel revamp to help it compete with Youtube.Existing LBRY.tv login will work.New categories, comments and other things.https://odysee.com/@eevblog:7You can follow all the science and engineering related channels in the "Lab" category. I made that category happen and picked all the relevant channels I could find.https://odysee.com/$/lab
Ebay new false or missing contact information policy. - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 19, 2020, 04:21:59 am
content: QuoteIs this really a thing? What is eBay really up to?

author: greenpossum
author_rank: Frequent Contributor
timestamp: September 19, 2020, 04:32:00 am
content: It's a thing.

author: ataradov
author_rank: Super Contributor
timestamp: September 19, 2020, 04:44:24 am
content: I'm in the US and I've got the same email. I think I once clicked on a link that someone shared and it took me to the Australian version. And since then part of eBay thinks I'm Australian and need my suburb to be corrected.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 19, 2020, 05:12:31 am
content: Quote from: ataradov on September 19, 2020, 04:44:24 am
XR2206 kit - schematic/mods for improvement - offline? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 18, 2020, 10:51:57 pm
content: A very nice man made a video showing improvements to the notorious and cheap "XR2206" (likely fake IC) kits, but his schematic files seem to have vanished!His name was Roger or something, from "Kainka Labs" - does anyone possess his modified schematics? I have a kit here and want to built it using his mods at build time.By the way:~ Yes, I know there are other options available, re kits etc.~ No, I don't want them - I am simply asking for the above info, or related, if you have it.Here's his video:Cheers

author: ledtester
author_rank: Super Contributor
timestamp: September 19, 2020, 12:23:52 am
content: In the description there is a link to "schematics with the optimized components and instructions".Unfortunately the link resulted in "File not found" for me, but it seems Kainka labs intended to make the information public. So, perhaps get in touch with them:https://www.kainkalabs.com/and alsohttps://www.kainkalabs.com/upload/index.php.Also check in the video around 21:13 for a screenshot of the schematics and list of changes.

author: eti
author_rank: Super Contributor
timestamp: September 19, 2020, 01:19:08 am
content: I've decided to also get myself an AD9833 module, as I hear great things about them, and WOW are they affordable! Any thoughts on those? Much appreciated.)

author: ledtester
author_rank: Super Contributor
timestamp: September 19, 2020, 04:07:38 am
content: The AD9833 has been discussed quite a bit on these forums.In particular, check out this somewhat recent thread:https://www.eevblog.com/forum/projects/diy-function-generator-design/
Tequipment Discount Code - Page 1
Forum section: electronics / general

author: AB8DT
author_rank: Newbie
timestamp: December 17, 2018, 01:07:24 pm
content: Can I get a discount code for Tequipment.net?

author: Baxsie
author_rank: Newbie
timestamp: September 19, 2020, 12:32:08 am
content: AB8DT:Did you get a discount code from anyone?Could you, or some other helpful soul, share that with me?I tried the code listed here:https://www.tequipment.net/HakkoT18-D24.html?v=0but it would not take it for my order.Thanks in advance for any help you can offer.
How do they test complex systems like the SCADA controllers used in cars? - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: September 18, 2020, 01:49:45 pm
content: In the early stages of testing there's a high risk of blowing up an engine or running off the road which makes physical testing expensive and dangerous.Does that mean they have to build a software emulator that models the behaviour of the whole car just so they can get the software quality to a point where it is safe to test using the actual hardware?

author: SerieZ
author_rank: Regular Contributor
timestamp: September 18, 2020, 02:16:16 pm
content: Regarding the electronics each and every PCB is ICT,Functional and HASS tested by their Supplier with every part being traceable.I am very certain they also do a functional test (emulation) before giving it to a test driver and they will certainly test every single car during regular production.
Snail tape prototyping! - Page 1
Forum section: electronics / general

author: ChristofferB
author_rank: Frequent Contributor
timestamp: September 19, 2020, 03:28:28 pm
content: I'm sure we can all relate to the torment of having snails in our circuits..All kidding aside, I've found a product in the hardware store called "snail tape".It is 50mm adhesive backed copper foil, that I believe is marketed to put at the lower edge of doors or around flower pots to keep snails away. Copper is pretty toxic for them, I think.However it is excellent for prototyping, adding ground planes and power rails on prototypes, making RF tight plastic enclosures and so on! It is much cheaper than the good copper tape you can get for electronics works, too. In normal soldering use, I havent seen the adhesive fail or peel.Thought I should share

author: joeqsmith
author_rank: Super Contributor
timestamp: September 19, 2020, 05:41:23 pm
content: I have always used 3M. Looking at Digi-Key, I wonder if they are no longer selling it.https://www.digikey.com/products/en/tapes-adhesives-materials/tape/908?k=copper%20foilMy stock is slowly running out and it seems you have found an easy way for me to obtain it.https://www.amazon.com/Copper-Foil-Tape-Conductive-Electrical/dp/B07765ST49
how long does it take to use reel of solder say 500g 60/40 - Page 1
Forum section: electronics / general

author: pcmad
author_rank: Regular Contributor
timestamp: September 18, 2020, 12:40:57 am
content: how long does it take to use reel of solder say 500g 60/40in your answer please also tell mewhat you do ie pro, hobby or repearhow ofen do you solderwhat you solder ie hole or smdwhat thickness do you use

author: rsjsouza
author_rank: Super Contributor
timestamp: September 18, 2020, 01:48:03 am
content: It varies greatly with use and diameter. I have a 0.5mm 500g 60/40 spool that is going on for 15+ years but most of the soldering I did was at work during this time. Only in the past 5~7 years I did soldering at home in a more intensive way.If you solder SMD the use is lighter and it will last longer that if you do chassis and larger components, wires, etc.

author: BravoV
author_rank: Super Contributor
timestamp: September 18, 2020, 01:48:41 am
content: Just few seconds.

author: aargee
author_rank: Frequent Contributor
timestamp: September 18, 2020, 02:04:34 am
content: Sounds like a 'how long is a piece of string' question.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 18, 2020, 03:00:20 am
content: A 454g roll lasts many years for me.

author: Domagoj T
author_rank: Frequent Contributor
timestamp: September 18, 2020, 05:48:43 am
content: Long enough to not justify cheaping out and buying the cheapest on ebay.I use 1 mm for most work and 0.5 mm for finer stuff. The 1 mm seems to be used up in about a year, the 0.5 mm lasts much longer.I do both SMD and THT, solder almost daily.

author: Mr.B
author_rank: Unknown
timestamp: September 18, 2020, 06:05:10 am
content: Quote from: Domagoj T on September 18, 2020, 05:48:43 am^This.Do not cheap out.I have various thicknesses in 500g rolls - all of them have a little silver as well.This increases cost, but improves flow.I usually get many years out of a roll.Hobbyist level stuff. A couple of hours each weekend.
LED clearance - Page 1
Forum section: electronics / general

author: vixo
author_rank: Regular Contributor
timestamp: September 17, 2020, 09:49:34 am
content: when making panels etc for LEDs, do they require any clearance? or are LEDs actually a little smaller than the standard sizes - 3mm, 5mm etc

author: Clear as mud
author_rank: Regular Contributor
timestamp: September 17, 2020, 10:09:57 am
content: I don't know, but I would start by checking the data sheet.

author: vixo
author_rank: Regular Contributor
timestamp: September 17, 2020, 12:11:52 pm
content: Im making the panel for someone else, i dont know what leds they will use - the panel is cut for both 3mm and 5mm, but exactly which ones i don't know

author: jfiresto
author_rank: Frequent Contributor
timestamp: September 17, 2020, 02:02:47 pm
content: I had to decide this a couple days ago and drilled 4mm holes for 3mm LEDs in an aluminum sheet metal panel: that is my smallest step drill.

author: jfiresto
author_rank: Frequent Contributor
timestamp: September 17, 2020, 02:19:05 pm
content: It is not the greatest photo but here is what the 3mm LEDs in 4mm holes looks like.

author: ledtester
author_rank: Super Contributor
timestamp: September 17, 2020, 02:40:16 pm
content: There is panel mount hardware for LEDs like this:Lets you adapt to slight variations in LED dimensions as well as securing the LED in place.

author: Ian.M
author_rank: Super Contributor
timestamp: September 17, 2020, 03:26:12 pm
content: Ask the <expletive> customer whether they need a push fit or a clearance fit. Warn them they may have to ream the holes if they need a push fit. For a clearance fit, 3.5mm and 5.5mm should do nicely as typically good quality LEDs have a diameter tolerance of 1 thou, (0.25mm). If your mill or drill press has a bit of runout and tends to drill oversize, you may need to go down to 3.2mm for the 3mm LEDs

author: jfiresto
author_rank: Frequent Contributor
timestamp: September 17, 2020, 04:42:19 pm
content: Quote from: Ian.M on September 17, 2020, 03:26:12 pmThe Everlight 3mm LED datasheet I recently looked at (Taipei, March 2006) gave 3+/-0.2mm (+/-8 thou).

author: Ian.M
author_rank: Super Contributor
timestamp: September 17, 2020, 04:45:04 pm
content: OUCH!! That (+/- 8 thou) would make a reliable push-fit impossible in any sort of rigid panel. WTF are they doing to get that sort of size variation? Are they running their encapsulation machine without maintenance till the mold's so worn it produces a vaguely cylindrical blob?

author: jfiresto
author_rank: Frequent Contributor
timestamp: September 17, 2020, 04:57:55 pm
content: I am puzzled why Everlight is lax about the diameter: it is a flat top, cylinder LED. The datasheet notes that "without special declared, the tolerance is±0.25mm."
OT Restoration of a vintage watch - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 15, 2020, 01:02:44 pm
content: Very interesting to me for the;Tools and equipment used.Size of parts and skill level involved.

author: VK3DRB
author_rank: Super Contributor
timestamp: September 17, 2020, 12:18:21 pm
content: And I thought working with 0402 and 0201 resistors was a pain. Brilliant restoration video. The watch jeweller is obviously very skilled and had the right gear. The watch dial would have been very difficult to restore. But I don't know why did did not bother restoring the metal part of the watch hands.
Vintage Flip Clock Radio Restoration & Motor Repair Magnavox - Page 1
Forum section: electronics / general

author: jcrubin
author_rank: Frequent Contributor
timestamp: August 29, 2020, 02:10:27 pm
content: We were looking for a counter top flip-clock and I saw this one on ebay. I thought I'd take a chance. A cube style having a smaller profile was ideal, and the price was good. There was no obvious signs of damage and all of the knobs appeared to be there.As arrived, everything appeared to work, it looked as though it just needed a cleaning. Both clock and radio functioned. Immediately noticed was dirt on the glass that appeared to be on the inside, so disassembly started. There's no info on this so it was done carefully.The clock mechanism removed exposed the glass which shows the dirt on the inside as well as the neon bulb covered with dirt. a technique with q-tips managed to get in with glass cleaner to remove all dirt from the glass, solving for this issue, though it was evident that the motor had some start-up drag and needed cleaning.The motor was removed from the clock mechanism and the lower portion dipped and drained in 99.9% alcohol for short events and allowed to drain, the motor spun by hand for several events to break up the dirt, then left to dry and reassembled. Re-spinning the motor showed no drag.After re-assembly, the outside was treated with furniture wax, the knows all polished and reassembled. Testing of the flip mechanism was within a minute as expected and the clock holds perfect time as it is timed to the mains 60hz.

author: VK3DRB
author_rank: Super Contributor
timestamp: September 04, 2020, 12:53:37 pm
content: Looks great. Good restoration.With the just alcohol, the bearings will be running dry in the motor. Maybe WD-40 or sewing machine oil would be a good lubricant for the motor.I once made a terrible mistake when restoring a rare 1940's radio. I decided to remove the dial plate and gently wash off the built-up grime with mild soapy water. The tiny radio station ID characters on the dial plate all floated away.

author: GlennSprigg
author_rank: Super Contributor
timestamp: September 05, 2020, 01:04:24 pm
content: Yea, a lot of the old electro-mechanical clocks utilized a basic Synchronous motor, which locked it in to your Countries supply frequency.Her in Australia, and many other parts of the World, this causes problems way beyond a simple voltage adaptation.To VK3DRB, oops!!... Thatoldpaint can besoooooodelicate !

author: jcrubin
author_rank: Frequent Contributor
timestamp: September 12, 2020, 03:47:32 am
content: There is no way to disassemble these motors. The tolerances are so tight, that anything in between will cause resistance. A simple shaft goes through to the other side and pinned to the end. There is no lubrication.
[S] Bus Pirate: does it STAY in "transparent bridge" (UART) mode? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 10, 2020, 08:50:56 pm
content: I have a JYETech "DSO-150" pocket 'scope, and I have compiled a new firmware fromhttps://github.com/michar71/Open-DSO-150- what I need to know is, if I use my "Bus Pirate" in "transparent bridge" aka UART mode, and setup that mode using "Teraterm" or whatever, will the Bus Pirate STAY in that mode if I then exit "Teraterm" and use it with "Flash Bootloader Demonstrator" as is required by the DSO-150 upgrade process?Here's the upgrade guide; I just need confirmation that "Bus Pirate" won't exit UART mode unless I send it the reset signal?https://jyetech.com/wp-content/uploads/2019/01/dso150-shell-how-to-upgrade-firmware.pdfThany Manks!:Once "Bus Pirate" is in UART mode, and all bitrates etc set, you just enter "(1)" and it enters transparent UART bridge mode. I have now successfully updated my JYE TECH DSO-150 to the custom firmware (see below) and will test it soon.
does anyone remember that one eevblog video? - Page 1
Forum section: electronics / general

author: sahko123
author_rank: Frequent Contributor
timestamp: September 09, 2020, 02:22:28 pm
content: I vaguely remember Dave making a video that mentioned anisotropically conductive foam used to test bga ics. Does anyone remember what video this was from? Ive been trying to find out more about this sort of foam and if its even still commercially available. I just about was able to find the name of this unidirectional phenomenon.

author: jogri
author_rank: Frequent Contributor
timestamp: September 09, 2020, 04:02:43 pm
content: I don't know if there's a foam with this property, but anisotropically conductive tape is readily available: It basically consists of regular tape with a lot of embedded metal "blobs"-> The metal makes contact in the Z direction while not shorting out the pins next to it. It's sold by 3M as Z-Axis electrically conductive double sided tape, but it's expensive af.

author: Ranayna
author_rank: Super Contributor
timestamp: September 09, 2020, 05:32:25 pm
content: Wasn't that more of a "jelly" material? I remember that being featured and explained in a teardown of an old programmer. There it was used to adapt to various chips.I think it was this video:

author: rfeecs
author_rank: Frequent Contributor
timestamp: September 09, 2020, 05:46:48 pm
content: I think Dave has mentioned "ZEBRA strips" in several videos:https://en.wikipedia.org/wiki/Elastomeric_connectorA more general term would probably be elastomer contactor.
Is this a silly question? (Proteus on VMware) - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 09, 2020, 01:58:05 am
content: Is this a silly question?I'm trying Proteus/ISIS inside VMware... seems pretty slow. I know, maybe I'm being Captain Obvious...

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 09, 2020, 02:03:19 am
content: If you can let the vm have enough cpus and cores and memory, the extra layer performance hit should be too bad. Maybe you've got a setting that the host is having trouble virtualising.
multimeter - Page 1
Forum section: electronics / general

author: mushthaqgtr
author_rank: Newbie
timestamp: September 07, 2020, 11:35:10 pm
content: i am planing to buy new multimeter hioki dt4282 what you guys think about dt4282,... i am ECE engineering.. student.. i am using uni-t ut139c

author: ledtester
author_rank: Super Contributor
timestamp: September 08, 2020, 12:42:49 am
content: As an electrical engineering student I don't think you need to spend that much money (29000 INR = $410 USD) on a multimeter.

author: ebastler
author_rank: Super Contributor
timestamp: September 08, 2020, 06:02:35 am
content: Which features are you missing in your Uni-T at the moment?

author: mushthaqgtr
author_rank: Newbie
timestamp: September 08, 2020, 03:21:31 pm
content: the Rotary switch kind of death

author: bsfeechannel
author_rank: Super Contributor
timestamp: September 08, 2020, 09:07:42 pm
content: Clean the rotary switch contacts and the corresponding PCB traces with isopropyl alcohol and it'll be as good as new.
Looking for a disassembler better than DASMx - Page 1
Forum section: electronics / general

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: September 08, 2020, 03:34:26 am
content: I am looking for a easy to use disassembler (preferably free or low cost) with all features of DASMx including code threading and multiple code entry points along with flagging of indirect/index jumps with the following additional features:User defined opcodes and actions (Branch/Jump/Call etc. with optional field byte(s)) for a particular architecture (e.g. certain CMOS MCS-48/UPI-41 family device opcodes differ between manufacturers within their respective device families or the many 8051 derivatives with differing special function registers)For CPU architectures with separate memory and I/O spaces (e.g. Z80, 8086 etc.), support for user symbol definitions for each space (DASMx only allows user labels for memory space but not I/O space)Support for bank switching with flagging of branches/jumps/calls etc. from non-banked memory to banked memory, flagging of pointers set to within banked memory range and code threading from banked memoryOne disassembler which can easily have user defined opcodes and actions implemented (but no code threading, multiple code entry points and flagging of index jumps):https://github.com/jefftranter/udis
Delta Technical Operations Center in Atlanta / Aircraft / Engine Repair - Page 1
Forum section: electronics / general

author: winniethepooh_icu
author_rank: Contributor
timestamp: September 07, 2020, 06:22:22 am
content: It must have been very cool to work on the 747's. So many big beautiful engines. Delta has dropped these from their fleet and the only way to fly them with sky team is to book a KLM or Korean Air ticket. Otherwise, I think it is just Lufthansa. I know these are not the most efficient vehicle but they will always be my favorite.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 07, 2020, 10:26:17 pm
content: More than you ever wanted to know about rebuilding jet engines:https://www.youtube.com/user/AgentJayZ/videosAt one point (something like 15 years ago), there was speculation that cars may eventually be powered by jet engines due to the higher efficiency. But it turns out that when weight is not the most important factor, Atkinson cycle engines are as efficient as very advanced jet engines sized for a car, while costing far less.
EEVBLOG Brymen BM235 world's first aerogel multimeter? - Page 1
Forum section: electronics / general

author: srruhl3701
author_rank: Newbie
timestamp: September 02, 2020, 04:17:42 pm
content: I happened to visit Dave's Amazon store. The weight listed for the BM235 is 0.01 ounces. Has to be all aerogel.

author: EEVblog
author_rank: Unknown
timestamp: September 07, 2020, 12:31:12 am
content: Aerogel now removed!

author: babysitter
author_rank: Frequent Contributor
timestamp: September 07, 2020, 01:38:14 pm
content: Does that make it lighter or heavier? Asking for a friend.
U.S. considers blacklisting China’s largest chipmaker [Unconfirmed] - Page 1
Forum section: electronics / general

author: Mecanix
author_rank: Frequent Contributor
timestamp: September 06, 2020, 09:19:56 am
content: I'm sure nobody asked the EEngineering Force 1 and corporate about this not so brilliant idea before lashing out the ongoing blackmailing at China in the media. So I'll ask on their behalf. What does it all mean for the commercial and household products knowing most if not all have mixed foreign/imported technologies (regardless of their origin)? Or is this just part of the ongoing ill politically motivated anti-china propaganda out of fear of superpower overrides? Is this of any real and immediate concerns to you/your company?https://www.cnbc.com/2020/09/05/us-considers-blacklisting-chinas-largest-chipmaker-as-tech-tensions-escalate.html

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 06, 2020, 09:48:29 am
content: I don't see it causing too much ill-effect. Even if this happens, the policy will only be to appease a certain part of the community. A service in an intermediary country will just route the stuff where it needs to go.It'll be a cat and mouse game. But we can be sure that the US will get tired of bothering to chase the mice long before the Chinese will get tired of running around.

author: ebclr
author_rank: Super Contributor
timestamp: September 06, 2020, 04:01:36 pm
content: This routing procedure, will do exactly the intent to increase price , and logistic complexity Who at the end will create a "artificial" more competitivity for production outside China, To cover the "artificial" tricks Chinas use to makes made in CHina competitive.

author: winniethepooh_icu
author_rank: Contributor
timestamp: September 07, 2020, 06:07:35 am
content: *yawn*
what longest and most wide single board you seen? - Page 1
Forum section: electronics / general

author: aqarwaen
author_rank: Regular Contributor
timestamp: September 04, 2020, 06:50:04 pm
content: i was watching dave teardown videos..dave said large boards cost more and need more tweaks to make and he said its cheaper to make them in smaller pices to save money..so my question what is largest board in one pice you seen?how large boards you seen in one pice?would it possible to manufacture 65 inch tv size single board in one pice or how large you could go?

author: joeqsmith
author_rank: Super Contributor
timestamp: September 04, 2020, 09:01:42 pm
content: I would imagine, like any board, the material, number of layers, spacing, controlled impedance.... will all be part of it. Yields from the board house may go into the toilet.Four of them come to mine. One very old using a mix of surface mount and through hole on FR4, 4 layer. I would guess was around 16" X 14". I am looking at one that is a little newer on Kapton, all surface mount which is 10" X 15". This one has no board stiffeners as it's on an aluminum substrate. We made some larger ones from Arlon. The worst was a power supply that I bet was close to that 16X14 board that required several stiffeners. We later changed that design to a board maybe 6X6.I would talk with your board houses and see what they have to say. You may be shopping around a bit.

author: TerraHertz
author_rank: Super Contributor
timestamp: September 05, 2020, 12:44:36 am
content: I think the largest PCB I've seen, are these. I have a stack of them, varying layouts but all the same card size. They are apparently from some huge vector processing mainframe, quite old. But the history is lost.PCB aize is 515 x 482 mm, 2 mm thick. I don't know how many layers.Each board weighs 5 Kg, and there are about 20 of them.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 05, 2020, 03:03:03 am
content: Have seen somewhat larger boards, albeit much lower density, in old industrial machines.Think Mike (mikeselectricstuff) has made more than a few LED strips that challenge fabs on the aspect ratio. He did a video some years ago discussing this; at some point it's better to use modest sized boards (say 1-2m long) and join them with connectors, than to make full length ones. tl;dr ask your fab.Tim

author: johnh
author_rank: Regular Contributor
timestamp: September 05, 2020, 07:07:14 am
content: The largest board I have seen are from a classic Ericsson Axe Processor. This one was manufactured 1978

author: daqq
author_rank: Super Contributor
timestamp: September 05, 2020, 07:14:25 am
content: In person? Some giant backplane for a server or something. Can't remember the size, but it washuge. It was mostly connectors I think.On picture? 26 meters in length:https://www.unmannedsystemstechnology.com/2019/03/worlds-longest-multilayer-flexible-pcb-manufactured-for-uav-wings/

author: Refrigerator
author_rank: Super Contributor
timestamp: September 06, 2020, 10:02:50 pm
content: Not necessarily large, but i've seen a very long one in a big LG plasma TV. Basically as wide as the display.
online course recommendations (canada) - Page 1
Forum section: electronics / general

author: PhilG
author_rank: Newbie
timestamp: September 04, 2020, 04:00:44 pm
content: Hey all. I wasn't able to find any relevant discussions for this but i'd like to get some input. I'm looking to move into electronics repairs (moving from a computer support tech) and I need an online electronics course with a path towards certification. I'm looking to get into a in-house or field service tech position than train towards a QA or design role.I'd like a 1 or 2 year beginner to Associate Certified Electronics Technician (CETa) certificate course in Alberta, Canada. I know I can learn this on my own (and I'm doing that) but I need that piece of paper. ICS is looking like my best option but I'm open to ideas.Thanks.PhilG
Infineon h-bridge driver cheap drop-in replacement? (EG Micro) - Page 1
Forum section: electronics / general

author: nuclearcat
author_rank: Unknown
timestamp: September 12, 2020, 09:07:46 pm
content: Not sure which section it will go, but noticed there is a lot of drop-in replacement for many infineon half-bridge drivers?https://lcsc.com/product-detail/Driver-ICs_EG27324_C189546.htmlFor example EG2113 looks very similar to IRS2113.I'm curious if they are better or worse.
Retro Convex Video Display - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: August 31, 2020, 12:27:33 am
content: is there a market for retro convex 12"inch or 17"inch liquid crystal displays?the convex screen with wide bezel widths of two inches or more.will it be viable to develop this product idea, as a lot of other technology has got the retro reproduction treatment.curved screen TVs were introduced to the consumer market in 2013, so why not the retro market too?how hard is it to retro manufacture a 12"inch or 17"inch monochrome CRT display?I would envisage a 12"inch or 17"inch type color or monochrome green or amber convex panel that has a 4cm border in a curved glass screenemulating the look and feel of a cathode-ray tube,without the long neck, using ether liquid crystal or organic light-emitting diode technology to display video input standards such as MDA, CGA, HGC, Tandy, PGC, EGA, VGA, MCGA, 8514 or XGAwith matching bezel & or full case.curved screen TVs see video.so retro convex 12"inch or 17"inch can be manufactured if the need is there.monochrome CRT display's are becoming rare in 2020 see video.there is a market for a retro Commodore PET C64 see video.

author: edy
author_rank: Super Contributor
timestamp: August 31, 2020, 06:21:11 am
content: I have games that emulate the retro screen look. They have that grainy CRT dot look and do a bit of warped curvature effect around the edges too, and sometimes even add other distortion and noise to give it a retro feel. However this is all displayed on a standard flat panel display. If you mask the corners of your screen to 4:3 ratio and add a thicker piece of glass on top of the display, the simulated look may be convincing. But I don't see the need to produce 4:3 LCD's that are actually curved and warped.

author: Rick Law
author_rank: Super Contributor
timestamp: August 31, 2020, 07:48:30 pm
content: One problem with convex screen is reflection/glare. Convex mirror, as in some your car's rear view mirror, offers you a wider view but distorted view of what is behind you.That you can see more of what is behind you may be a good thing, but it also means that a ceiling light, desk-lamp, or light from a window that a flat mirror cannot reflect would be more likely to appear in your reflected convex mirror view.Your LCD/CRT screen is like a mirror. When it is geometrically convex, it will reflect disruptive light from a wider angle. So, glare is far more likely on a convex screen than a flat screen. A very bright screen will overpower the glare, but it is still there and may be disruptive. Matted screen also offers some glare suppression, but I'd rather it doesn't happen to begin with.Like all decision factors, this is one factor that some would put higher in priority than others. I personally would not think convex screen will be popular for this reason alone.
crack that tube open - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 29, 2020, 04:30:25 am
content: I used to smash tubes open with a hammer... but I was 8.This guy does it more delicately.And he understands the tube unlike 8 y.o. me.

author: duckduck
author_rank: Frequent Contributor
timestamp: August 30, 2020, 06:17:18 am
content: He's also got a teardown of a 6L6G and another one of a 12AX7 and a 12AU7. That's neat.EDIT:Mr. Carlson suggests using heat (e.g. run a bunch of electrons through a few loops of 14 AWG copper wire that you've wrapped around where you scored the tube) to crack a tube open. He says it works well.

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 30, 2020, 11:37:53 am
content: Yea, it's interesting to see some of the various types/qualities of construction, from different countries manufacturers.Particularly when it is often hidden/obscured by various 'getter' silvery colour or blackness!! Or originally in a Metal Can!I've often found that old Russian tubes were generally built much more robustly and durable!Interesting note...Some brands of Vacuum Tubes were still using 'older' manufacturing processes, in regards to types of or lack of variations of thoriated heatersetc, and different types/processes of 'getter' use. This generally resulted in a 'blackened' look from the outside. They often didn't want peopleto know they were still using antiquated processes, so they would spray paint the whole outer glass with Gold coloured Paint to mask it,before printing any writing on them.

author: TimFox
author_rank: Super Contributor
timestamp: August 30, 2020, 01:44:51 pm
content: Several RCA receiving-tube manuals are available as online PDFs. Different years had different line drawings showing tube construction, with captions denoting the different elements or steps in the assembly.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 30, 2020, 10:45:11 pm
content: Quote from: TimFox on August 30, 2020, 01:44:51 pmI bought a copy of thishttps://www.renaud-bray.com/Livres_Produit.aspx?id=894280&def=Tubes+audio+anciens+et+r%C3%A9cents,IBRE,+FRANCIS,9782866611552Sure it's in French but so many pictures! Covers many makes and countries.
230v 70s motor wiring - Page 1
Forum section: electronics / general

author: lightspeed
author_rank: Newbie
timestamp: September 03, 2020, 01:59:40 pm
content: I have an old compressor I rescued from the trashcan and was looking to test it however while the name plate says "230v" I see an incoming white and black wire on the pressure switch. Circa 1976.Thats leading me to believe its actually 120v. Anyone experience this? Wiring diagram seems to contradict voltage rating. Will post pics shortly.

author: WattsThat
author_rank: Frequent Contributor
timestamp: September 03, 2020, 02:09:39 pm
content: The wire color means absolutely nothing.If it more than 1 HP, I’d lean more towards thinking it’s 230 volt. The starting cap rated voltage may be another clue. You might be lucky and find a connection diagram inside the conduit box or capacitor cover.

author: drussell
author_rank: Super Contributor
timestamp: September 03, 2020, 02:16:43 pm
content: Indeed, the wire colors are irrelevant.Many smaller motors, though, can be wired for either 120 or 230v depending on how the windings are connected in the junction box terminal, usually accessible under a small cover with a couple screws.The data plate will generally indicate this, though, so if itjustsays 230v it is probably 230v only.Perhaps you could post a photo of the data plate and a photo of the motor itself so we could advise further?

author: Stray Electron
author_rank: Super Contributor
timestamp: September 03, 2020, 02:22:00 pm
content: Anything 1/2 HP or less is probably 110VAC only. Anything over 1 1/2 HP is probably 220VAC only. Between those ranges it's probably 110 or 220 VAC motor depending on the straps in the junction box. If there's a box on it open it up and there should be a label telling how to jump it for each voltage. Keep in mind that manufacturers were lying like all Hell about motor power in those days and it's HP rating is probably greatly exaggerated. What type power plug is on it?You should be able to look up the make and model number and find a manual for compressor and/or the motor and it should tell you everything that you need to know.You should beverywary of running on old compressor that you don't know anything about! Many of those old tanks were never drained properly and water collected in them so they are rusted out and can easily explode if you put much pressure in them.
MOVED: using 150w power supply on dell inspiron one 2320 AIO that needs 180w  - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: August 30, 2020, 07:44:40 am
content: This topic has been moved toGeneral Computing.https://www.eevblog.com/forum/index.php?topic=252188.0
Interesting "phone phreaking" recordings - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: August 29, 2020, 08:20:54 pm
content: Fascinating archive of the older POTS PSTN being explored & exploited! Sit back, take a week off work & enjoy!https://www.evan-doorbell.com/

author: schmitt trigger
author_rank: Super Contributor
timestamp: August 29, 2020, 08:55:25 pm
content: Thanks for sharing.Of course, one of the most famous phreakers was Steve Wozniak of Apple I and II fame.

author: eti
author_rank: Super Contributor
timestamp: August 29, 2020, 09:02:45 pm
content: Quote from: schmitt trigger on August 29, 2020, 08:55:25 pmYes indeed. Don't you, like me, also get utterly fed up of hearing about Apple NON STOP, though?

author: coppice
author_rank: Super Contributor
timestamp: August 29, 2020, 09:07:54 pm
content: Oh, that takes me back to the 80s, doing some of the early telephone network tone processing by DSP techniques, and spending hours with problematic recordings from the public network, refining my algorithms.
Is SSL certificate of eevblog expired? - Page 1
Forum section: electronics / general

author: Muku
author_rank: Contributor
timestamp: August 27, 2020, 06:58:01 pm
content: Hello, Is the ssl certificate expired or am I being hacked?

author: dr.diesel
author_rank: Super Contributor
timestamp: August 27, 2020, 07:00:04 pm
content: See here:https://www.eevblog.com/forum/blog/eevblog-ssl-certificate-has-expired-today/

author: eti
author_rank: Super Contributor
timestamp: August 27, 2020, 11:56:19 pm
content: Quote from: Muku on August 27, 2020, 06:58:01 pmI got the same error on Chrome.

author: bingo600
author_rank: Super Contributor
timestamp: August 28, 2020, 01:06:24 pm
content: Seems likely it was expired as mentioned aboveThis is the current properties (brand new)/Bingo
Workbench lash-ups ... The Battery holder - Page 1
Forum section: electronics / general

author: Brumby
author_rank: Unknown
timestamp: August 27, 2020, 06:07:40 am
content: Have you ever had a battery you needed to connect to - like NOW - but not had the right holder for it?What have you done to address the lack of time to do anything but work with what is within reach......?Here's my contribution from today - an A23 12V:A couple of M5 bolts stuck through the package they came in, with a nut for gap adjustment. Worked much better than I had hoped.Has the additional benefit of accepting eye terminal connections with a few extra nuts.

author: Ian.M
author_rank: Super Contributor
timestamp: August 27, 2020, 06:13:54 am
content: Heh. That's much better than the usual rubber band round the battery long-ways, with a spare set of meter probes stuck under it.

author: ledtester
author_rank: Super Contributor
timestamp: August 27, 2020, 06:21:42 am
content: There are some ebay/aliexpress offerings for this... search for: "4 wire battery holder" or "4 wire battery stand":

author: Brumby
author_rank: Unknown
timestamp: August 27, 2020, 06:41:41 am
content: Yeah ... I don't have any of those laying around.Very fancy.

author: Ian.M
author_rank: Super Contributor
timestamp: August 27, 2020, 07:08:27 am
content: Yes, that's overkill for anything except precision cell testing.Fancy is usually any hard plastic tube you have handy that's a reasonably good loose fit for the battery diameter, with a couple of holes in it for nails across it. A conical spring for contact pressure is nice, but at a pinch, a bit of aluminum foil wrapped round a chunk of closed cell foam will do. It gets a bit unwieldy if you want 12V as for an AA pack that ends up being about 17" long!

author: mcinque
author_rank: Unknown
timestamp: August 27, 2020, 01:42:26 pm
content: Magnets and wires soldered? Maybe they doesn't allow too much current, but they works fine

author: Mr Evil
author_rank: Regular Contributor
timestamp: August 27, 2020, 03:51:58 pm
content: Nice reuse of one of those horrible plastic packages.I cobbled together something when I wanted to do some battery capacity measurements. I took a couple of bits of copper sheet, cut a bit off one side to form two ears for clipping wires to, for 4-wire measurements. From the offcuts I hammered the copper offcuts into dome-shapes and soldered them on so that they can make contact with batteries that have recessed ends. Some scrap carbon fibre angle and bolts glued on allow them to clip into the holes in my clamp, so they can be adjusted to hold any size of battery securely.

author: JohanH
author_rank: Frequent Contributor
timestamp: August 27, 2020, 06:47:17 pm
content: Had the same issue the other day with an A23 battery. Two terminals and an IC tube to the rescue.

author: Daixiwen
author_rank: Frequent Contributor
timestamp: August 28, 2020, 08:11:46 am
content: wires and duct tape. works great too

author: lwatts666
author_rank: Unknown
timestamp: August 28, 2020, 08:42:49 am
content: I've been caught raiding the kid's Lego...
Hurricane Laura - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: August 26, 2020, 02:49:36 pm
content: Well, I don't know if there are people affected or that will be affected by this Hurricane but if yes, keep yourself and your families safe.

author: TerraHertz
author_rank: Super Contributor
timestamp: August 27, 2020, 07:18:36 am
content: Before believing hysterical media hype, always check weather sites likehttps://www.ventusky.com/?p=29.56;-92.65;8&l=wind-10mhttps://earth.nullschool.net/#current/wind/surface/level/orthographic=-89.66,31.82,3000/loc=-92.821,29.488For one thing, the media like to quote max wind speeds for at least 1000m up, where the wind is _much_ faster than at ground level. Currently the max ground level wind speed is about 90 MPH.

author: Black Phoenix
author_rank: Super Contributor
timestamp: August 27, 2020, 09:27:43 am
content: Quote from: TerraHertz on August 27, 2020, 07:18:36 amI personally use the websitehttps://www.cyclocane.com/daily, since here in Southern Asia Typhoons are common most of the year, specially between May and September, so each and everyday I'm checking it for updates of possible storm formations. Since it also aggregates the official warnings and reports from the Joint Typhoon Warning Center it's always the official without the media hype.

author: rdl
author_rank: Super Contributor
timestamp: August 27, 2020, 12:59:09 pm
content: Laura at landfall had 150 mph wind speed which ties for #5 all time worst. This one seems to be going a little more north than usual according to predictions and probably won't affect me much. I had never been in a hurricane until Katrina and I'm perfectly fine with never seeing another one.

author: cdev
author_rank: Super Contributor
timestamp: August 27, 2020, 05:08:23 pm
content: I like the interface on windy.com
Hook up wire flexibility rating/keyword - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: August 25, 2020, 11:28:25 pm
content: Hi,I'm looking to order few 100m of awg22 silicone hook-up wire from china (alibaba) but i don't want to get that ultra ultra flexible stuff.I think you will know the kind i mean. You pickup a length of it and it flops down in a sharp 90deg bend right at the end of you finger.Is there a name or rating for wire flexibility types that i can ask about to reduce the chance i will get the wrong type of wire?Thanks.

author: andy3055
author_rank: Super Contributor
timestamp: August 25, 2020, 11:41:02 pm
content: May be you are looking for Solid core hook up wire. See below.https://www.digikey.com/catalog/en/partgroup/solid-hook-up-wire/1915

author: Psi
author_rank: Super Contributor
timestamp: August 26, 2020, 12:00:20 am
content: na, i don't want rigid wire. definitely want stranded.Just not that ultra floppy silicon type you sometimes see.Maybe its down to the number of strands?

author: notsob
author_rank: Frequent Contributor
timestamp: August 26, 2020, 01:34:04 am
content: Try some of the silicon wire from hobbyking - available by the meter in various AWG and colours this may help with making a decision

author: PeteH
author_rank: Unknown
timestamp: August 26, 2020, 02:04:34 am
content: Ultra flexible stuff will have a high number of ultra fine strands, 100s of fine wires. Likely thinner silicone insulation (0.010" vs 0.030")

author: TimNJ
author_rank: Super Contributor
timestamp: August 28, 2020, 05:59:29 am
content: Maybe check for a specific UL identifier? If I recall correctly, pretty standard hookup wire is usually UL1007.Go for 7 strands if you don’t want it too floppy.

author: Psi
author_rank: Super Contributor
timestamp: August 30, 2020, 02:38:40 pm
content: Yeah, i've been collecting more info on this.For AWG24 at least, it looks like ~11 strands is your typical stuff and ~40 is the ultra floppy stuff.There's lots of alibaba sellers for silicone ~40 strand awg24 wire but the ~11 stuff is less common.I used to buy it from digikey, but at NZ$80 for 150m i cant really justify that when silicone wire is ~NZ$50 for 400m on alibaba