hybridfree/eevblog-posts huggingface dataset:
butter, ketchup, mayonnaise - Page 1
Forum section: electronics / general

author: bob91343
author_rank: Super Contributor
timestamp: June 30, 2019, 05:07:07 am
content: From the refrigerator, butter starts out very solid. As it warms, it gets softer and, if it's a warm enough room, actually can melt into liquid.Mayonnaise and ketchup aren't like that. They remain essentially the same consistency over a wide range of temperatures. I think, prepared mustard also.Why is this?

author: Rerouter
author_rank: Super Contributor
timestamp: June 30, 2019, 05:17:05 am
content: Butter is non-eutectic, essentially different parts of it begin solidifying or melting before others, leading it to have a wide temperature range where its not fully solid and not fully liquid, similar to 60/40 solder.Ketchup and mayonaise are similar, there viscosity drops as they are heated, but fridge temperature to cold room temperature would be minimal, and I do not believe either of them have components that solidify above 0C,Ketchup being water based with salt likely would behave the same at about -2 to -7C, mayonaise depends a lot on exactly what oil they used, probably somewhere around -9 to -15

author: TerraHertz
author_rank: Super Contributor
timestamp: June 30, 2019, 05:24:44 am
content: Also look up the word Thixotropic.Ketchup and mayonnaise don't even have stable viscosity around room temperature.

author: ivaylo
author_rank: Frequent Contributor
timestamp: June 30, 2019, 05:50:08 am
content: Also emulsions behave funny. Of those you listed not sure about ketchup, but mayo and mustard are classic examples of emulsions -https://en.m.wikipedia.org/wiki/Emulsion

author: EEVblog
author_rank: Unknown
timestamp: June 30, 2019, 07:59:52 am
content: Not even remotely electronics related. Please try to stay on topic.
Administrator help required - Page 1
Forum section: electronics / general

author: Guineafowl21
author_rank: Contributor
timestamp: June 28, 2019, 10:05:32 am
content: Hello,I messed up the registration process - iPad barged in with a suggested password, and I ended up saving the wrong password in keychain. This was under username guineafowl21.Tried reset password, but the session kept timing out or the message ‘user doesn’t exist’ came up.Tried re-registering, but ‘that email address already exists’ came up.Now registered as ‘guineafowl21’ under a gmail account that I don’t really use.Could I delete the user ‘guineafowl’ or at least stay as ‘guineafowl21’ but using my hotmail address instead?Thanks.

author: tautech
author_rank: Super Contributor
timestamp: June 28, 2019, 10:08:32 am
content: To help get this sorted promptly I'll report your post to get admins attention.

author: Simon
author_rank: Unknown
timestamp: June 28, 2019, 01:31:32 pm
content: How long ago where you trying to reset the password? we had some issues the other day. Have another go and if that does not work We will have to look at deseting the account.

author: Guineafowl21
author_rank: Contributor
timestamp: June 28, 2019, 02:47:46 pm
content: I just tried now. I get the email link, follow it, enter a new password, it says ‘saved’, then I try to log in and it won’t let me.If easier, could you change the email address for user guineafowl21 to hotmail.com from gmail.com?

author: EEVblog
author_rank: Unknown
timestamp: June 29, 2019, 01:31:23 am
content: Quote from: Guineafowl21 on June 28, 2019, 02:47:46 pmDone, and Guineafowl account deleted.
Specialized Car ECU Repair - Page 1
Forum section: electronics / general

author: SparkyFX
author_rank: Frequent Contributor
timestamp: June 30, 2019, 11:41:13 pm
content: Well, transmission warning indicator on, no gear change, it probably lost ATF during that impact and then either the wrong amount of ATF was replaced or the wrong type or it collected water while standing around. As likely some sensors could have gotten a hit.
Balancing, and how can this be possible? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: June 30, 2019, 04:06:49 am
content: At 11 second mark, how is it possible to balance an off-centered hex wrench with a round contact surface with a bottle with another round surface? What is providing the counter force for the horizontal force coming from the decomposition of the diagonal force?

author: langwadt
author_rank: Super Contributor
timestamp: June 30, 2019, 04:10:25 am
content: Quote from: blueskull on June 30, 2019, 04:06:49 amas long as the center of gravity is inline no problem

author: james_s
author_rank: Super Contributor
timestamp: June 30, 2019, 04:21:59 am
content: Give me a tube of cyanoacrylate and no problem

author: BravoV
author_rank: Super Contributor
timestamp: June 30, 2019, 04:25:43 am
content: Another little tiny details, a special breathing technique is needed.Just try your self using a sharp pointy object like a needle, under SMD soldering microscope, point (not touching) one of the fine IC pins, say like QFN and watch how the needle tip drift, and keeps practicing until it wont drift to other neighboring pins.Know and aware of this from a friend which is a watch repair man for living.

author: james_s
author_rank: Super Contributor
timestamp: June 30, 2019, 04:29:27 am
content: Quote from: blueskull on June 30, 2019, 04:24:18 amYeah not saying they're cheating, who knows, probably there is a mix of some people who are really good at figuring out how to get things to balance in crazy ways and other people who are creative at coming up with tricks to make it look like they have done so, ie illusionists, the classic stage magic.

author: BravoV
author_rank: Super Contributor
timestamp: June 30, 2019, 04:38:30 am
content: Quote from: blueskull on June 30, 2019, 04:31:30 amNope, I failed miserably when I tried, probably not enough perseverance or lazy.Not very sure, but what I learnt from my friend which is also a yoga practitioner, is to try to find "a sweet spot" of breathing rhythm and breath depth/shallow, that minimize the body rhythmic movement, especially at hand and fingers, while at the same time, your whole body and arm of course, don't get tiring fast because of lack of oxygen, as these takes quite some times.This definitely needs a lot of practice and patience.Oh yes, expert military sniper has this similar or kind of techniques too.PS : As you're a Chinese, if you're really interested, you should wake up early, go around your neighborhood (in China of course, not US) and talk to those elders that practice Tai Chi.
Electronics LEDs: Custom light dimming tape/stickers? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: June 19, 2019, 06:29:39 pm
content: Hi all,We've got an electronics device with 5 LEDs on the backside. Currently these shine through an end plate with a fairly sharp light - and we'd like to dim it.To do so, we wanted to find self-adhesive tape/stickers of the right shape (around 1 cm x 3 cm e.g. per end plate), which we could attach to the inside of an endplate within the aluminum enclosure.However, this seems surprising hard to find. The closest match are below:https://www.amazon.com/LIGHTDIMS-LD002-LightDims-Black-Edition/dp/B009WSN8PK/ref=sr_1_8?keywords=original+lightdims&qid=1560968925&s=automotive&sr=1-8-catcorrHowever, we need something that works for several thousand units, so were hoping for something customized or at least intended for scale.Maybe I'm searching for the wrong thing. Any suggestions?Thanks all!

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 19, 2019, 06:33:35 pm
content: Have you tried regular office tape?

author: thm_w
author_rank: Super Contributor
timestamp: June 19, 2019, 07:57:02 pm
content: This is something you would go to a print shop/sticker supplier and get them to do for you. Normally you would supply a drawing with the shape/colors (DXF, etc.), but in this case maybe not necessary.Not suggesting to do this, but if you can find the material and wanted to do it yourself it may be possible, with a machine like the cricut.

author: Martin F
author_rank: Regular Contributor
timestamp: June 28, 2019, 11:48:46 am
content: Hi again,We've tried regular tape, but it has practically no effect. I believe this needs to be some type of thicker and "semi-transparent" tape.If any suggestions, let me know.Martin

author: Urs42
author_rank: Unknown
timestamp: June 28, 2019, 12:03:21 pm
content: Electrical tape did work really well for bright LEDs in some Devices i have. Try some colors to see which works best for your LED.

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 28, 2019, 01:24:58 pm
content: Quote from: Martin F on June 28, 2019, 11:48:46 amTry holding a sheet of ordinary white paper over the LEDs. If that gives the effect you desire, some paper labels will probably give the same effect.
Please refresh my memory (DIY power supply project) - Page 1
Forum section: electronics / general

author: JJalling
author_rank: Unknown
timestamp: June 27, 2019, 08:22:29 am
content: Hello all,I'm trying to find a DIY bench power supply project, that I saw a couple of years ago - hopefully some of you know what I'm talking about, and can come up with a name or a link to the project. (And no, its not Prasimix's powersupply)What I remember about the project.It was a custom aluminium enclosureIt had two isolated channels (two separate boards, connected to the main board)It used 7 segment displays for voltage and currentthe main controller for the two channels was an fpga (spartan 2 or 3)It had a switch mode power supply for the voltage rails (I think it was based of a TI reference design) and then pre-regulators on the two powersupply boardsDoes this ring a bell for anyone?Thank you, br Jonas
industrially produced historical battery database? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: June 29, 2019, 04:31:46 pm
content: is there one?If you wanted to find out what kind of batteries were for sale in 1940 in factories and in stores? And tidbits of information about them like common issues, weird behavior (maybe like notorious battery manufacturers which had a propensity for destroying equipment.. maybe a battery plague (like with those panasonic caps in the 90's), etc.Not quite as interesting as tubes but stillis there more then this? Did people just not make lots of different batteries like today?https://en.wikipedia.org/wiki/List_of_battery_sizes#Obsolete_batterieshttps://en.wikipedia.org/wiki/Battery_(vacuum_tube)and how about safety and fire issues related to HT batteries?

author: daqq
author_rank: Super Contributor
timestamp: June 29, 2019, 09:03:40 pm
content: Try searching for advertisments and vintage radioamatuer magazines.https://www.bonanza.com/items/like/431638647/1940-Delco-Battery-Ad-The-News-Spreadshttps://www.etsy.com/no-en/listing/555268721/1941-ray-o-vac-batteries-vintage-adWhile not a database it will provide you with some info.

author: coppercone2
author_rank: Super Contributor
timestamp: June 29, 2019, 09:08:18 pm
content: hm, I wonder if you can find something independent from a electronics magazine or something.Advertisements won't tell you the real history.like analysis documents

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 30, 2019, 03:57:45 pm
content: There is a company that still makes pretty much every battery type ever made, forgot what they were called. But they are relatively pricey, have plain white casings, and do not often come in rechargeable varients.I'll do some digging.EDIT: Excell Batteryhttps://excellbattery.com
EEVBlog followers from INDIA 🇮🇳 - Page 1
Forum section: electronics / general

author: minoshi8
author_rank: Newbie
timestamp: June 26, 2019, 08:15:53 pm
content: hey i am just making this poll in order to get in touch with indian hobbyist community . Not many are passionate about electronics in india so thought those who might be i would keep in ttouch with them if possible.
Square wave voltage attenuation issue - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: June 26, 2019, 08:38:40 pm
content: I got a signal generator that only goes down to 0.2V for squarewaves. And I need to some how trick it to go as down as 0.05V.Is there a way to achieve that with a simple circuit between the generator and DUT? Maybe a simple voltage divider?

author: Zero999
author_rank: Super Contributor
timestamp: June 26, 2019, 09:59:14 pm
content: Yes, a potential divider will work.What's the frequency?At high frequencies it's best to match the impedance to the cable.I'd recommend aiming for a round attenuation factor such as /100, then the signal generator can be set to 0.5V, giving 50mV out.

author: gkmaia
author_rank: Frequent Contributor
timestamp: June 26, 2019, 10:28:17 pm
content: Thanks for the feedback!Frequency is 1Khz. I could then get an output between a 1K resistor and a 10 then that would allow 5ma to flow?!

author: awallin
author_rank: Frequent Contributor
timestamp: June 27, 2019, 04:18:16 am
content: for 1 kHz the resistor values probably won't matter much, as long as your generator can drive the voltage-divider and your load that you hook up to the output doesn't draw much current.In general for RF you want the generator to see a 50-ohm load through the attenuator network when a 50 ohm DUT is connected to the output.This page has resistor-network schematics as well as resistor values that ensure 50 ohm matching:https://www.electronics-notes.com/articles/radio/rf-attenuators/pi-t-bridged-resistor-values-table-calculator.php

author: Zero999
author_rank: Super Contributor
timestamp: June 27, 2019, 08:25:31 am
content: Quote from: gkmaia on June 26, 2019, 10:28:17 pmThat's fine for 1kHz, assuming the rise and fall times aren't critical, which they probably won't be.In the longer term, I recommend making a switch-able attenuator. The switch and resistors, should be at the end of the coaxial cable and the probes should be as short as possible. Here's the schematic of one I made. The 1P3T switch is a rotary switch. The resistors aren't standard values, so will need to be made of other resistors in series or parallel, for example 33R+12R = 45R and 1R||1R = 0R5. The calculator linked below can help you find suitable resistor combinations.https://www.qsl.net/in3otd/parallr.htmlEDIT:Note how R1+R2+R3 = 50? That's no accident. It's designed that way to match the coaxial cable and the signal generator's output impedance.
Udemy Now Demand Exclusive Content - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: June 27, 2019, 08:31:56 am
content: Udemy now demands exclusive rights to content.Screw that!Video from Robert Feranec who does excellent PCB tutorials.

author: ebclr
author_rank: Super Contributor
timestamp: June 28, 2019, 08:22:31 am
content: Give Udemy a finger up

author: olkipukki
author_rank: Frequent Contributor
timestamp: June 28, 2019, 05:47:51 pm
content: Quote from: EEVblog on June 27, 2019, 08:31:56 amAs per my understanding, this is related to 'Udemy for Business' only, isn't?Therefore, he still can restrict to Udemy's generic public...

author: HwAoRrDk
author_rank: Super Contributor
timestamp: June 28, 2019, 08:04:27 pm
content: Yes, true, but I think his point was that Udemy for Business is charging money for access to some of his content there that is free (the Altium course), but giving him nothing in return and at the same time requiring him to make all his Udemy for Business content exclusive to Udemy.Not a good deal at all.
Turning off a monitor... using a grill lighter! - Page 1
Forum section: electronics / general

author: mdszy
author_rank: Unknown
timestamp: June 26, 2019, 10:09:47 pm
content: Was lighting a candle on my desk when suddenly my monitor shut off for a second... I realized it was the lighter doing it! There's a spark-generating element on the end, and it seems like it was effectively EMP-ing the monitor to death for a few seconds. This was a free monitor I got from an old workplace because it was slightly broken, and it's pretty sketchy anyway. Found this pretty hilarous.

author: wraper
author_rank: Unknown
timestamp: June 26, 2019, 10:15:48 pm
content: You are just adding noise to video interface (HDMI, DVI, DP) so received data gets corrupted and monitor stops displaying image until it resyncs to the video signal.

author: mdszy
author_rank: Unknown
timestamp: June 26, 2019, 10:18:45 pm
content: Quote from: wraper on June 26, 2019, 10:15:48 pmThat definitely makes sense.Doesn't happen on any of my other monitors, guess this one just has worse shielding?

author: wraper
author_rank: Unknown
timestamp: June 26, 2019, 10:20:18 pm
content: QuoteFar from that. Monitor never stops working properly. You might change video cable to some of better quality or adding ferrite choke onto it and this effect might disappear completely. Or you may plug it into the same socket as computer, if not already. That might help as well.

author: mdszy
author_rank: Unknown
timestamp: June 26, 2019, 10:20:48 pm
content: Quote from: wraper on June 26, 2019, 10:20:18 pmThe DVI monitor cable already has a pretty hefty choke built into it.

author: wraper
author_rank: Unknown
timestamp: June 26, 2019, 10:22:31 pm
content: Quote from: mdszy on June 26, 2019, 10:20:48 pmBut not all of them are even real, some are just a fake piece of plastic. Anyway it's worth trying different cables.

author: SparkyFX
author_rank: Frequent Contributor
timestamp: June 27, 2019, 12:21:43 am
content: Check this out:There were some additional hints in thethread

author: Red Squirrel
author_rank: Super Contributor
timestamp: June 27, 2019, 01:54:54 am
content: We have this issue at my work, I've never seen it anywhere else. We all have 4+ monitor and all of us have at least 1 monitor that will randomly flicker. For some people it does it a lot, while some it does it less. Sometimes an action will trigger it, like someone walking by, or picking up something off your desk. We pretty much figure it's a static electricity thing, but why does it only affect 1 monitor and only in that office? I've never had this happen at home or in other offices. We've been through multiple different PCs and monitors over the years but the problem follows, it's odd.
Can we work around GSM's security problems by disabling 2G? - Page 1
Forum section: electronics / general

author: hozuculeni
author_rank: Newbie
timestamp: June 26, 2019, 03:29:22 pm
content: GSM is an undead old technology that a)have too weak encryption, and b)clients don't validate the identification of base stations.There are some ways to force disable 2G and use only 3G and up on some phones.My question is, after disable 2G GSM on the phone, will it be as safe as CDMA? If not, why and how to solve it?
use mobile phone without battery - Page 1
Forum section: electronics / general

author: nvidia
author_rank: Regular Contributor
timestamp: June 16, 2019, 03:56:01 am
content: so i have an older 5.1 android mobile phone with decent specs but problem is the battery swelled up i have tried to find a replacement but have no luck the phone only powers on if battery is in the phone but rather then having the battery catch fire or explode ect i got rid of iti really want to use this phone with my Bluetooth controller and have the phone connected to power via usb cable what can i do?

author: soldar
author_rank: Super Contributor
timestamp: June 16, 2019, 08:00:59 am
content: Previous thread:https://www.eevblog.com/forum/repair/can-i-wire-a-smartphone-to-bypass-its-battery/

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 16, 2019, 12:40:27 pm
content: Just take a 1N4001 diode and put it from USB power to battery positive. Quick and easy way to get a bit of a voltage drop.

author: Terry01
author_rank: Frequent Contributor
timestamp: June 16, 2019, 12:47:37 pm
content: Quote from: NiHaoMike on June 16, 2019, 12:40:27 pmIt’s awesome the things that you learn here just reading random posts!

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 16, 2019, 01:59:28 pm
content: That's actually a trick I learned from Perk mining. In the early days, before IP and exchange limits were put in place, some would build up rather elaborate clusters with dozens of cheap smartphones and power them from an ATX power supply salvaged from an old PC, which also provided a source of 12V to run fans for keeping the cluster cool. The adventurous would just use a piece of wire instead of the diode, and the really adventurous would open up the PSU and adjust a trimpot to bring down the voltage. (Even then, the diode loss for a particularly big cluster drawing 30A would only be about 21W, hardly enough to be worth modding for.)

author: Terry01
author_rank: Frequent Contributor
timestamp: June 23, 2019, 06:42:11 am
content: Quote from: NiHaoMike on June 16, 2019, 01:59:28 pmIt's amazing what people create some times. One creates something then someone else adds a bit on and someone else adds their 2 bobs worth and so on and before you know it something really cool is made.Stuff being re-purposed is also well cool!

author: amyk
author_rank: Super Contributor
timestamp: June 23, 2019, 09:35:10 pm
content: Quote from: NiHaoMike on June 16, 2019, 12:40:27 pmThis is assuming the circuitry doesn't detect it as an overvoltage condition and shut down.

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 23, 2019, 11:46:48 pm
content: Quote from: amyk on June 23, 2019, 09:35:10 pmThe overvoltage protection pretty much always just switches off the charger. Or at least that's how the cheap ($20 and less) phones used for Perk mining did it.
Plasma wind tunnel!!! - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: June 22, 2019, 10:45:05 pm
content: Its a little more complicated then a tunnel, fan, and some sparks, it a huge facility to test just one part something like 10Mw of energy!https://youtu.be/58EO5SKgU2s

author: Beamin
author_rank: Super Contributor
timestamp: June 22, 2019, 10:45:49 pm
content: Why don't youtube links appear as large pictures instead of links now?

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 23, 2019, 03:50:46 am
content: It was a recent change to allow linking to Youtube videos without them appearing as players. The full link still works.https://www.eevblog.com/forum/suggestions/youtube-com-and-youtu-be-broken-embedded-player-in-forum/

author: coppercone2
author_rank: Super Contributor
timestamp: June 23, 2019, 04:50:33 am
content: this is interesting. i have seen plasma plumbing that just consists of wire 'slinkies' that direct plasmathat looks expensive. whats that like a solar wind simulator?

author: ruffy91
author_rank: Regular Contributor
timestamp: June 23, 2019, 07:38:58 am
content: "The Plasma Wind Tunnel Complex has two available hypersonic arc-jet facilities, SCIROCCO and GHIBLI, for the ground simulation of the aerothermodynamic conditions acting onto Thermal Protection Systems and Payloads of space vehicles during the hypersonic reentry phase."https://www.cira.it/en/research-infrastructures/plasma-wind-tunnels/Plasma%20Wind%20Tunnel%20ComplexAlso:"It is powered by an arc heater of 70 MW maximum electrical power and it is able to generate a plasma jet of up to 2 meters of diameter, at Mach 12, for a test duration of up to 30 minutes. The test gas is a mixture of Air and Argon with a maximum mass flow rate of 3.5 kg/s. Inside the arc, the compressed gas is heated up to plasma temperatures in the range of 2,000-10,000 K."Impressive!

author: chris_leyson
author_rank: Super Contributor
timestamp: June 23, 2019, 10:23:28 am
content: A recent short video from ESA where they use a plasma wind tunnel to test how parts of a low earth orbit satellites burn up on reentry.https://youtu.be/MF44aWIcViY
EL Lamp (led alternative) from ebay troubleshooting - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: June 22, 2019, 09:00:42 pm
content: I just bought one of these EL lamps claimed to be an LED alternative.By being and LED alternative I would believe it behaves like and LED and will work with low DC instead of requiring an inverter.I tested the lamp with 6, 9 and 12 VDC on both leads and nothing.What I am getting wrong here? Is the auction misleading? What does he mean by LED alternative?!

author: ataradov
author_rank: Super Contributor
timestamp: June 22, 2019, 09:16:14 pm
content: This looks like a real EL panel. One of the lots says: "Can be bent or cut in any shape." and "Operating Frequency 50 - 5000 Hz (best at 400-600Hz)". This is a real EL.

author: gkmaia
author_rank: Frequent Contributor
timestamp: June 23, 2019, 12:12:31 am
content: Yes you are right... down on the description it mentions the need of an inverter...
Finding out, what sells the most - Page 1
Forum section: electronics / general

author: Raj
author_rank: Frequent Contributor
timestamp: June 22, 2019, 06:36:28 am
content: Is there any way, that I could can I find the sales figures of maker productsI wanna know what's the hottest product/kit category in the maker community.

author: sleemanj
author_rank: Super Contributor
timestamp: June 22, 2019, 09:07:45 am
content: Sort Aliexpress category by sales.
Pricing for sourcing and assembly jobs - Page 1
Forum section: electronics / general

author: electrotwelve
author_rank: Contributor
timestamp: May 21, 2019, 06:00:11 pm
content: I've recently received an enquiry for a sourcing and assembly job for bulk quantity custom hardware. I'm wondering how you guys would price for such jobs? Cost + profit? Also how would you quote this to the client? Would you share detailed costings including your profit margins or would you simply quote one number?P.S: Also posted on Reddit just to get more coverage and (knowledgeable) eyeballs!

author: ajb
author_rank: Super Contributor
timestamp: May 21, 2019, 10:11:51 pm
content: That's an awfully broad question with nowhere near enough info to answer. But to give a broad answer, your job price should cover:- The cost of materials--not the purchase price but the landed cost, including the cost of procuring, shipping, storing, tariffs, etc- Labor--remember to account for the fact that humans aren't robots here, and scale your labor estimates accordingly- Planning--*your* labor in selling and planning out this job- Overhead--the cost of your fixed facilities and staffing- Equipment cost--especially if you need to procure special equipment, and wear and tear on existing equipment- Waste/Contingency Margin--a certain fraction of your work may get spoiled for some reason or another, or it may take a few tries to get the process figured out. This applies to all of the lines above- Profit

author: OwO
author_rank: Super Contributor
timestamp: May 22, 2019, 02:59:24 am
content: For assembly+labor you usually quote a single number, but for sourcing you should give the customer an itemized list of the price for each component, because most of the time the customer wants to know what prices you are able to source parts at, so they can provide some parts themselves if they can get it at a better price.

author: Raj
author_rank: Frequent Contributor
timestamp: June 22, 2019, 07:09:53 am
content: Visit nearest MSME office They'll do it for you.
Microsoft Flight Simulator is back! - Page 1
Forum section: electronics / general

author: Raj
author_rank: Frequent Contributor
timestamp: June 22, 2019, 06:52:21 am
content: DCS world baby, that's where my interest is. Just setting my planes on autopilot and flying straight for hours just ain't my thing.I wish that they bring back their flight combat sim. It's long overdue.Maybe they should partner upBut this news is great,since it would mean, greater native support for odd flight sim controllers on PC.
transmission in the spectrum between mm waves and IR - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: June 22, 2019, 06:32:52 am
content: Millimeter waves are transmitted with metal wires usually a dipole in a wave guide, but far infrared is transmitted by a black body or LED. Where in frequency, and what is in the in between? This always fascinated me that heat was just radio waves, but not really. The definition is: "IR frequencies range from about 3 GHz up to about 400 tHz, and wavelengths are estimated to range between 1,000 micrometers (µm) and 760 nanometers (2.9921 inches), although these values are not definitive according to nasa/google". 3 gHz at 1mm? More like 10 cm; well with in the range of creating a physical metal dipole, but 760 nm is almost red-light and can't be made with metal conductors. How small can you make the dipole? Or is the problem not making a really small dipole but somehow getting the RF out of your oscillator? I heard that at high frequencies you have to send the rf down tubes, would these literally hook up to the output transistors in the transmitters? Would it have a tiny metal antenna inside the tube surrounded by dielectric or air? If you had a DC to daylight transmitter what would happen as you cranked up the frequency with different antennas or exotic transmitting elements hookedup?Microwaves are weird and now I understand why its called voodoo and not nearly as much info is on it like regular RF electronics.
U.S. blocks China Supercomputer Efforts - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 22, 2019, 12:09:50 am
content: China's supercomputers are the latest target in US trade warThe Trump administration's export restrictions cut off Chinese supercomputer developers.https://www.engadget.com/2019/06/21/us-export-restrictions-blocks-china-supercomputer/

author: Stray Electron
author_rank: Super Contributor
timestamp: June 22, 2019, 12:17:56 am
content: And?If China is so "capable" then why can't they produce their own components? After all, if their super computers are built with US parts, they can hardly be called "Chinese" computers can they?

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 22, 2019, 02:40:49 am
content: This has further info on the news:https://www.wsj.com/articles/u-s-targets-chinas-supercomputing-push-with-new-export-restrictions-11561129547Or PDF attached.

author: shteii01
author_rank: Frequent Contributor
timestamp: June 22, 2019, 03:00:13 am
content: (cough cough) beowulf cluster (cough cough)

author: VK3DRB
author_rank: Super Contributor
timestamp: June 22, 2019, 03:41:27 am
content: Quote from: blueskull on June 22, 2019, 01:40:21 amThe real reason the US is blocking this technology is:-It consumes much less power than American technology.-It is inherently protected against electromagnetic pulse radiation and solar flares, whereas the American technology is not.-It is impervious to cyber attacks.-It does not use use rely on Windows, Linux or Unix.-The operating system is completely embedded into hardware and does not require updates.-Calculations are performed at lighting speeds using the Armstrong method.-China cannot be accused of violating patents in the technology.-The Americans are still trying to figure out how it works.Photo attached.

author: DG41WV
author_rank: Regular Contributor
timestamp: June 22, 2019, 05:10:23 am
content: How nice of USA to help china be more independent

author: BravoV
author_rank: Super Contributor
timestamp: June 22, 2019, 05:12:34 am
content: Quote from: DG41WV on June 22, 2019, 05:10:23 amThere, minor correction thats more suitable.
Testing a motor capacitor - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: June 21, 2019, 07:34:48 am
content: I got to test a motor capacitor 5.5uf at 450v.The best I got to test it is a chinese testing mega. I know that is not the best testing gear, but that is all I got at the moment that can test capacitance.From my readings would be fair to assume the capacitor is fine? Or another more trustable way to test it?

author: Kleinstein
author_rank: Super Contributor
timestamp: June 21, 2019, 09:33:54 am
content: An alternative way of testing is to use a mains transformer to some 12 V AC and that just measure the AC current (usually a few mAs) with a DMM. The current is capacitance * 2 * pi * mains frequency * voltage. It's not very accurate (e.g. voltage changes with load and the AC current ranges are also often not that good), but usually good enough.

author: Ian.M
author_rank: Super Contributor
timestamp: June 21, 2019, 10:43:44 am
content: Its 8.5% low in value which is still within its permitted +/-10% tolerance, but may indicate that its slowly dying as self-healing film caps loose capacitance as defects heal. OTOH it may have been that value from day one.To confirm its good, you also need to test its leakage at above its peak working voltage but less than its rated voltage. Charging it to 400V DC (from a fused or short-circit protected supply) would be appropriate, then if possible, measure the leakage current directly, otherwise, disconnect it and check the time constant discharging into a 10Meg input impedance DMM is 50 seconds to 1/3 of the initial voltage. If you get a much lower discharge time you need to find a datasheet to confirm it doesn't have an internal bleeder resistor.

author: tautech
author_rank: Super Contributor
timestamp: June 21, 2019, 11:56:59 pm
content: Checking these with a DMM cap test is just fine, they arenota precision cap.
High Dynamic Range Imaging... COOL !! - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: June 21, 2019, 12:27:42 pm
content: There's a special type of 'image' format, called.HDR(HDRI), that is not new, but maybe not seen orunderstood/used by a lot of people. It's called aHigh Dynamic RangeImage. It's sort of like a .jpg on Steroids!...And used in a lot of 3D work. They contain a lot ofhidden 32-bit data, but not going into that here...Maybe this will impress you though !!...Here's a scaled down.jpg 2Drepresentation of an example......It is a distorted 2D version of what is converted into a3D Map, using special tools. (Trying to keep it simple!).It's sort of like "Google Street-View", where you end up viewing the result in real 3D. Maybe this helps......A lot of people understand about 'Mapping' say a Texture onto a3D surface, with various software.So imagine the above 'image' is 'mapped' onto the surface of a transparent hollow glass surface, but NOWyou areINSIDEthat object, and you can now lookOUTin every direction to that surface!...You can't, yet(here)... sigh!... as you need a 'special' tool to do that. The BEST free 'viewer' is from 'LizardQ'......https://www.lizardq.com/en/viewer/for Windows AND Mac OS X. It doesn't 'install', but just Runs. The 1st thing it asks for is an .HDR file.That site supplies NUMEROUS examples, at various resolutions, to be downloaded, first !!!The above example can be found at......https://hdrihaven.com/hdri/?c=outdoor&h=vignaioliI suggest that the '4K' version will do for a start. There are MANY other samples from....https://hdrihaven.com/hdris/category/?c=outdoor&o=popularWhen you run the 'LizardQ' app, with the above mentioned example, you will see the following....but this does it an injustice !! Click the left mouse button in the image, & drag in all directions !Mouse wheel will zoom, and right-click will offer you a menu.....P.S. For those interested in surface textures, you can also accesshttps://texturehaven.com/textures/for example....Have fun
MIT EE Promo video fail - Page 1
Forum section: electronics / general

author: LeoTech
author_rank: Regular Contributor
timestamp: June 20, 2019, 01:14:38 pm
content: https://www.youtube.com/watch?time_continue=162&v=zF6hUza_sEsFast forward to 02:33!So I was looking around different colleges in the USA and stumbled across this promo video from one of the student dorms at MIT.In the video they show of their electronics lab.....I'll let you watch it yourself, but boy did I have a good laugh and a gaint facepalm!A big error like this should not be happening at an institute like MIT, even though the video is produced by the students.I recon it would even be dangerous to solder something like that.Happy watching and a good laugh to you,Leo

author: Sparky49
author_rank: Regular Contributor
timestamp: June 20, 2019, 01:22:26 pm
content: QuoteI think that may be the point of the video... Consider the context of the clip in the entire video...

author: Iceberg86300
author_rank: Contributor
timestamp: June 20, 2019, 02:44:02 pm
content: Quote from: Sparky49 on June 20, 2019, 01:22:26 pm+1 on that.And that iron wasn't even on anyway. Before watching the entire video I got the distinct feeling that someone was told to "grab some stuff & look busy" in that part of the clip.Even if it was 100% on the up & up, even MIT isn't immune from practical idiots. In fact, they probably get more than their fair share being primarily a theoretical institution, at least for undergrads.Sent from my SM-G900V using Tapatalk

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 20, 2019, 02:55:36 pm
content: Quote from: LeoTech on June 20, 2019, 01:14:38 pmAre you worried about the pins all being in the same row?

author: JDubU
author_rank: Frequent Contributor
timestamp: June 20, 2019, 03:33:03 pm
content: The video is just nerdy humor. A parody, of sorts, to grab your attention and get people talking about it.
Evolution Of The BadUSB - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: June 22, 2019, 06:34:39 pm
content: I knew of a couple of work places that disabled their USB ports from the bios many years ago so you couldn't connect anything to it.The keyboard and mouse were connected to the ps2 ports which I don't find often nowadays.
History of ARM Microprocessor and it's Rise and Fall. Dave Jaggar - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: June 21, 2019, 09:13:30 pm
content: Dave Jaggar"A History of the ARM Microprocessor and it's Rise and Fall.Over eight years Dave systematically defined the entire ARM architecture, enabling it to be a popular embedded controller for the digital revolution, with around 100 billion units shipped. As ARM’s Head of Architecture Design, Dave authored the ARM Architectural Reference Manual and is the Founding Director of the ARM Austin Design Center.

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 22, 2019, 12:13:03 am
content: I was getting ready to argue against ARM CPU falling...

author: JVR
author_rank: Regular Contributor
timestamp: June 25, 2019, 11:36:36 am
content: That was worth the watch. I think that must have been one hell of a ride for him.
Are there other companies like lcsc  - Page 1
Forum section: electronics / general

author: khessels
author_rank: Newbie
timestamp: June 19, 2019, 02:02:54 pm
content: Just out of curiosity, are there other companies like lcsc?i don't mean the western based companies like dk, mouser, newark etc.., but more like chinese, shenzen, India based but still good enough?
Krispy Kreme Debuts Doughnut For Apollo 11 Moon Landing 50th - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 18, 2019, 01:44:26 am
content: https://www.space.com/krispy-kreme-doughnut-apollo-50th.htmlhttps://www.youtube.com/watch?v=dYtA0sLubPc&feature=youtu.be

author: rs20
author_rank: Super Contributor
timestamp: June 18, 2019, 02:14:57 am
content: Out of the many things I see referenced on this forum; this actually seems fine to me. If a doughnut company wants to celebrate something, why not have it be one of the greatest technical and engineering feats of the 20th century? Are they not allowed to because they're "plebs who just make doughtnuts"?

author: Psi
author_rank: Super Contributor
timestamp: June 18, 2019, 02:18:14 am
content: The eagle has no space suit, this bothers me.

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 18, 2019, 02:19:58 am
content: " The surface appears to be glazed. "

author: EEVblog
author_rank: Unknown
timestamp: June 18, 2019, 04:04:28 am
content: Quote from: rs20 on June 18, 2019, 02:14:57 amThey can do anything they want, and people are allowed to judge it as pathetic andworthy.I watched that expecting a LM shaped donut or something, and it's just, well, a donut

author: Brumby
author_rank: Unknown
timestamp: June 18, 2019, 04:49:28 am
content: It would have been less worthy of the facepalm if they has actually sent a Krispy Kreme to be consumed on the moon 50 years ago.

author: raptor1956
author_rank: Frequent Contributor
timestamp: June 18, 2019, 05:45:03 am
content: This is nothing more or less than a marketing ploy and it appears to be working. Mind you, I have zero problem with a company attaching there name to this and I would not have expected an elaborate treat shaped like the LM, though the capsule would have been possible. Tang anyone?Brian

author: German_EE
author_rank: Super Contributor
timestamp: June 18, 2019, 08:57:29 am
content: We're going to see a mountain of stuff with only tenuous links to the moon landings over the next month, just accept it and move on.

author: Zero999
author_rank: Super Contributor
timestamp: June 18, 2019, 09:29:43 am
content: Yuck, I've never liked those doughnuts. I only like dinky doughnuts hot, straight from the fryer. Once the doughnut has been left to cool to room temperature and glazed, the nice crispy texture has gone and it's just crap.
corrosion inhibitors - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: June 16, 2019, 08:05:16 pm
content: I enjoy this channel. The latest video was on corrosion inhibitors. The topic of grease, oil, spit, contact cleaners comes up on this site from time to time. It may be of interest to a few of you.

author: orion242
author_rank: Unknown
timestamp: June 16, 2019, 11:41:54 pm
content: I want to know where to order this stuff.Just what anyone needs in the north to prevent red cancer from killing our cars.

author: BravoV
author_rank: Super Contributor
timestamp: June 17, 2019, 02:05:07 am
content: The video pointed out that the DMTD is the magic substance and works for "iron".For transitional metal, such as copper as its used a lot in electronics, the magic substance called imidazole beats DMTD, learned & experimented this while ago as my kid is a chemist.

author: coppercone2
author_rank: Super Contributor
timestamp: June 17, 2019, 03:10:03 am
content: very interesting but I don't see myself concocting deoxit fader lube, shield, gold, regular and LTCI in the shop and making a buncha spray cans.. too many different products use similar technologiesKinda nice to know whats in it though, maybe there is a super grade product that can be make for special applications like special nanovolt connectors or something made of exotic alloys

author: thm_w
author_rank: Super Contributor
timestamp: June 17, 2019, 08:28:11 pm
content: Quote from: BravoV on June 17, 2019, 02:05:07 amI still see studies for iron/steel for Imidazole, so seems like it could work for those as well.Would deoxit be more likely to be a imidazole derived chemical then? (few here for example:https://www.researchgate.net/publication/330640637_Two_Imidazole_Based_Corrosion_Inhibitors_for_Protection_of_Bronze_from_Urban_Atmospheres)The annoying thing is their MSDS (for the 100L) states 100% proprietary ingredients, which seems a bit odd, unless there really is no carrier liquid/dyes.

author: shteii01
author_rank: Frequent Contributor
timestamp: June 18, 2019, 03:47:32 am
content: Quote from: orion242 on June 16, 2019, 11:41:54 pmUse rust converter:https://www.theruststore.com/Rust-Converter-FAQs-W48.aspx
Need a copy of FlukeView Forms Basic, my CD is missing.. - Page 1
Forum section: electronics / general

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: April 27, 2012, 06:23:12 pm
content: I Need a copy of FlukeView Forms Basic, my CD is missing..For my 8846A..So please if someone could make zip?

author: M. András
author_rank: Super Contributor
timestamp: April 27, 2012, 08:36:01 pm
content: you can torrent it down, there is the full version of the program too, however took ages when i tried to download it and see what it can do

author: Unknown
author_rank: Unknown
timestamp: April 27, 2012, 08:51:54 pm
content: If Fluke doesn't offer it for download, it's very unlikely that they grant any redistribution rights to their customers. You could try asking Fluke support, they may be able to help you if you give the meter's S/N. Agilent offers their software for free.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: April 27, 2012, 08:59:57 pm
content: Thanks both of You, yes i was trying to download it as a torrent, file, but 5% in 2 days.. !Found one on the bay just now, just 30£..But i know the CD is here somwhere.. can you spot it??

author: TerminalJack505
author_rank: Super Contributor
timestamp: April 27, 2012, 09:04:22 pm
content: I'm going to guess that it is in one of the CD/DVD drives of one of those desktop systems on the right.

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: April 27, 2012, 09:20:41 pm
content: Quote from: TerminalJack505 on April 27, 2012, 09:04:22 pmHmm, maybee..but the easy way was this..http://www.ebay.co.uk/itm/FLUKE-FLUKEVIEW-FORMS-SOFTWARE-8845A-8846A-MULTIMETER-/180869051002?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2a1ca2b27a

author: M. András
author_rank: Super Contributor
timestamp: April 28, 2012, 08:09:56 am
content: if the trial version or dunno what does it calledby fluke you can download it from their site, it worked with my fluke 289 just like its original softare from the kit

author: diego.maga
author_rank: Newbie
timestamp: June 20, 2019, 10:19:02 pm
content: Hello, I need to get a copy of this cd, could you share a copy ?

author: MrMobodies
author_rank: Super Contributor
timestamp: June 21, 2019, 12:54:12 am
content: Quote from: ErikTheNorwegian on April 27, 2012, 08:59:57 pmI thought I recognised that board on the ground from somewhere.It looks a little bit similar to the one on the shelf from the EEVblog #1203 - REPAIR: Tektronix 2465B Oscilloscope

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 21, 2019, 04:23:24 am
content: This is a 7 year old thread....Tryhttps://www.eevblog.com/forum/testgear/lost-flukeview-forms-software/
Aerogel - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: June 17, 2019, 11:54:14 am
content: Does anyone know what a Panel with that cost?

author: bd139
author_rank: Super Contributor
timestamp: June 17, 2019, 12:19:48 pm
content: It's damn expensive. When I went to buy some a while back to play with it was around $60 for 1x1x0.75" block

author: Lord of nothing
author_rank: Super Contributor
timestamp: June 17, 2019, 12:23:00 pm
content: I guessed that. I saw a Video how the produced that. The used a ton of Alcohol.

author: German_EE
author_rank: Super Contributor
timestamp: June 17, 2019, 03:53:02 pm
content: For those of you who haven't seen it I can highly recommend the Veritasium YouTube channel, it's one of the best science channels out there.

author: ejeffrey
author_rank: Super Contributor
timestamp: June 17, 2019, 05:08:05 pm
content: Its very expensive for small pieces and *extremely* expensive for large pieces.The main problem is that it is very slow. The main problem is that it is very slow (requiring multiple solvent changes) and limited by the size of your critical point dryer. So very hard to mass produce.

author: Lord of nothing
author_rank: Super Contributor
timestamp: June 17, 2019, 06:11:37 pm
content: How does Styrofoam (or how does it called) get produced?What I know its some chemicals who get stiff when the leef a Nozzle?!Could not use the same system?