hybridfree/eevblog-posts huggingface dataset:
New schematic symbols - Page 1
Forum section: electronics / general

author: Analog Kid
author_rank: Super Contributor
timestamp: November 01, 2024, 08:31:45 pm
content: I think it's about time that our schematic symbols actually reflect real-world conditions. With that in mind I propose the following new symbols.I'm sure people can think of others. Let's see if we can get the I-triple-E to adopt these.

author: Kim Christensen
author_rank: Super Contributor
timestamp: November 01, 2024, 10:23:40 pm
content: Shades of Xkcd...

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 01, 2024, 10:59:15 pm
content: You might add a couple, although they are more like circuit snippets;Tran Noise amplifier (input signal controlled noise generator)No-pass filterReverse polarity battery.

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 01, 2024, 11:16:43 pm
content: How about a dual-reset flip-flop?Also known as the unflipable flop.Symbol and truth table attached.

author: Analog Kid
author_rank: Super Contributor
timestamp: November 01, 2024, 11:20:23 pm
content: Quote from: schmitt trigger on November 01, 2024, 10:59:15 pmThat's something I'd actually find useful. Been playing with noise gen. over the years.
Storage of test equipment - Page 1
Forum section: electronics / general

author: Squarewave
author_rank: Frequent Contributor
timestamp: October 22, 2024, 06:02:10 pm
content: Here's a little thing I've been wondering for a while, we probably all have test equipment we don't use all of the time or don't want to part with, so often we need find places to store items to keep the lab clear.The temperatures of loft spaces can get cold in the winters, hot in the summers, almost the same with the garage, but what are the upper and lower limits you'd be happy with storing equipment? I'm thinking about what I could do just to clear a few little items up for the time being. I can't be the only one who's thought of this or come into storage issues! I guess we all have too much stuff!

author: edavid
author_rank: Super Contributor
timestamp: October 22, 2024, 06:16:53 pm
content: Tektronix spec-ed a storage temperature range of -55 to +75C, so it's unlikely you would have any problem.The only problems I've had are with rubber/soft plastic parts like cables. Cold, dry storage causes them to dry out and crack. Warm, humid storage leads to mildew.

author: jonpaul
author_rank: Super Contributor
timestamp: October 23, 2024, 04:58:41 am
content: Humidity and salt water near sea/ocean/lake/rivers are the worst.most electronic equi will corrode and age rapidly.Use a dehumidifier, A/C, hermetic roomBesidses humidity caused corrosion, leaking lytics, dead backup batteries and water damage....Over decades the plastic and rubber parts degas and age, eg the notoroius Tektronix plugin pull tabls or the nylon/delrin gears in HP 8640 RF generators.Jon

author: GLouie
author_rank: Regular Contributor
timestamp: October 25, 2024, 03:39:09 pm
content: My feeling is that my gear needs to be kept in the same conditions that humans are "shirtsleeve" comfortable. Also, my policy is to plastic bag and/or box all items (loose, not airtight) to keep dust off. Some might then also insist on dessicant packs.

author: lokin4areason
author_rank: Contributor
timestamp: October 30, 2024, 03:02:36 pm
content: do you have storage area that you store awkward item(s) that is dry and out of the way ?besides in a box under a shelf or in a desk

author: tggzzz
author_rank: Super Contributor
timestamp: October 30, 2024, 05:36:18 pm
content: Quote from: Squarewave on October 22, 2024, 06:02:10 pmFirstly, look at the manuals to see the allowable storage temperature and especially humidity.Some components may be particularly susceptible to low/high temperatures, e.g. LCDs.Much equipment is specified for 80% RH and/or non-condensing; water vapour condensing on metals/batteries/etc can cause interesting consequences. Hence you need to understand the relationships between temperature, absolute humidity (g/m3), and relative humidity (%), especially when the total amount of water vapour in the air does not change.Consider sealing equipment in a plastic bag during summer, say 20C 50%RH. What will be the dewpoint as the temperature is lowered, say during autumn and winter? (Hint: it is well above 0C)
Aliexpress product recall - Page 1
Forum section: electronics / general

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 30, 2024, 04:48:24 pm
content: Has anyone had this happen with a product bought on AliexpressToday I received an email from Aliexpress, informing me that a product I bought might be illegal and should be recalled.It concerns some solder paste, which I have not used yet, so no idea if it actually is dangerous.The mail indicated I could apply for a refund, but of course it did not fly due to the fact that I ordered it over two months ago, so had to use the chat function. They applied for the refund for me, so now it is wait and see if my money comes back.

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 30, 2024, 05:01:14 pm
content: Found that someone else already started a thread about this.https://www.eevblog.com/forum/dodgy-technology/aliexpress-product-retired-because-illegal/msg5695375/#msg5695375
Unknown encoder - Page 1
Forum section: electronics / general

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: October 29, 2024, 12:52:37 pm
content: Hello, could anyone tell me where i can find that encoder please ?

author: ebastler
author_rank: Super Contributor
timestamp: October 29, 2024, 01:34:38 pm
content: AliExpress. Search for "Kailh 9" there (where the "9" apparently just means a size in mm).

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: October 29, 2024, 01:52:54 pm
content: Thanks for your answer, i've seen when i've uploaded the photo that the axle is broken and a pat of it is in the encoder, it seem to be a polystyrène part.A nylon part should last forever
"JYETech" DSO112A - need to upgrade battery - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: October 29, 2024, 07:59:37 pm
content: Hello.I have a JYETech DSO112A, and I want to upgrade the battery. I want to know what the two white wires are for, on this Alcatel battery, please, and will the DSO112A charge it okay?Thanks chaps.

author: flipper
author_rank: Regular Contributor
timestamp: October 31, 2024, 02:43:14 am
content: Anyone?

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 31, 2024, 07:20:59 am
content: They could be the wires of a temperature sensor. As it is a single cell there is no balancing needed, which on multiple cell batteries leads to additional wires if there is no BMS in the battery itself.But it can still get warm or hot when charging/discharging and the device might cut off the process in that case.The battery on the picture is clearly not original for a JYETech DSO112A, so I guess you got this one from a phone or tablet and want to stick it in the DSO112A. If so you can most likely just ignore the two white wires.

author: flipper
author_rank: Regular Contributor
timestamp: October 31, 2024, 07:36:54 am
content: Quote from: pcprogrammer on October 31, 2024, 07:20:59 amThank you so much.Okay, I metered in VOLTAGE mode across the white wires... nada (as opposed to using ohms mode, and risking damaging my DMM), and then used ohms mode, and there's a 211k resistance across the two white wires, so seems like the sensor you talked about.
A simple solution to test lead management - Page 1
Forum section: electronics / general

author: watchmaker
author_rank: Unknown
timestamp: October 28, 2024, 02:34:57 pm
content: In the vein of RoGeorge, I offer the following use of cable clips:

author: RoGeorge
author_rank: Super Contributor
timestamp: October 28, 2024, 08:56:35 pm
content: For the oscilloscope probes and other long cables I use a round plastic container (from ice cream) anchored vertically on the wall, similar with this:Longer cables and oscilloscope probes are left to hang left and right above the round box. The diameter of the container is big enough, about 22cm (9inch), so to not bend-stress the hanging probes.The cables are left to hang half cable on the left side, and the other half of the cable on the right, such that the cable rest in the shape of a "U-turn". That way a probe has to support only half of its own weight, as opposed to the typical straight-hanging, where all the weight of the cable+connector stretches the cable.

author: watchmaker
author_rank: Unknown
timestamp: October 28, 2024, 09:38:34 pm
content: Your idea is better than mine if for no other reason that youmusteat the ice cream in order to store your probes.
Help suitable replacement hard to find Mosfet - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: October 29, 2024, 04:17:45 am
content: I've got mosfet that I need to replace and when searching online for it the only available options are from China or on eBay for a ridiculous price for one of them.I tried using one of those websites to find an equivalent mosfet, but the ones that it lists are also not easy to find...I know all the specs of it, I'm not sure which ones are the most important, etc... It's used as a blower motor speed control in a vechile.Its a 2SK2313 (K2313)Type of Transistor: MOSFETType of Control Channel: N -ChannelPd - Maximum Power Dissipation: 150 W|Vds| - Maximum Drain-Source Voltage: 60 V|Vgs| - Maximum Gate-Source Voltage: 20 V|Vgs(th)| - Maximum Gate-Threshold Voltage: 2 V|Id| - Maximum Drain Current: 60 ATj - Maximum Junction Temperature: 150 °CQg - Total Gate Charge: 170 nCtr - Rise Time: 30 nSCoss - Output Capacitance: 2600 pFRds - Maximum Drain-Source On-State Resistance: 0.011 OhmPackage: TO3P

author: Poroit
author_rank: Frequent Contributor
timestamp: October 29, 2024, 09:31:02 am
content: G'day,I suggest post this in the "Repair" section so that the whizzes like fzabkar can pick up on it.

author: Zero999
author_rank: Super Contributor
timestamp: October 29, 2024, 11:34:38 am
content: It should be easy to find something which will work.I found this, using the parametric search on a distributor's website such as Digikey.https://www.digikey.co.uk/en/products/detail/vishay-siliconix/IRFP064PBF/811664https://www.vishay.com/docs/91201/irfp064.pdfWhich has a slightly lower voltage rating of 55V vs 60V, so check.https://www.digikey.co.uk/en/products/detail/infineon-technologies/IRFP064NPBF/811663https://www.infineon.com/dgdl/irfp064npbf.pdf?fileId=5546d462533600a40153562840351fcaDiscalimer read the data sheets and conduct your own testing to determine the suitability.
Ring Laser and Fiber Optic Gyroscope Calibration Against Celestrial Movement - Page 1
Forum section: electronics / general

author: Foxxz
author_rank: Regular Contributor
timestamp: October 27, 2024, 08:20:28 pm
content: Since the Ring Laser and Fiber Optic gyroscopes depend on the speed of light being a constant - How does the rotation and orbit of Earth affect calibration and the data that these devices produce? If we expand out further you might consider the travel of our solar system through the galaxy. I'm going to guess that the macro-movements and constant velocities of these macro-movements don't really show up well in the data or are presented as noise. But it had me wondering.

author: ejeffrey
author_rank: Super Contributor
timestamp: October 27, 2024, 09:35:09 pm
content: Sufficiently accurate ring laser gyroscopes can definitely measure the rotation of the earth and even slight wobbles in that rotation.

author: jonpaul
author_rank: Super Contributor
timestamp: October 28, 2024, 05:29:23 am
content: INS and GPS>> speedEinstein equations for correction speed of light.j

author: mawyatt
author_rank: Super Contributor
timestamp: October 28, 2024, 02:53:05 pm
content: RLG and FOG operate on slightly difference principles, the RLG in the Frequency Difference between two counter rotating HeNe Laser Beams within a cavity and the FOG with the Phase Difference of the counter rotating beams within the Optical Fiber, both when exposed to rotation.In early 80s FOG development Earth Rate was the limiting noise factor until a researcher discovered the FOG Transfer Function was asymmetrical when moving forward and backward thru time, while the RLG was symmetrical. Once new symmetrical FOG architectures were developed the FOG performance soon equaled the RLG and well below Earth Rate.The RLG performance was limited by the HeNe Laser path length, paths too long won't Laze and thus limit the "Exposed Area" of the RLG which determines the sensitivity (among many other things), whereas the FOG benefited from "Exposed Area" with larger diameters or/and multiple turns of the Fiber such as wound on a spool.The RLG had issues with the Counter Rotating Laser Beams Injection Locking at low rotation rates causing a dead zone which was solved by various "Dithering Methods". The FOG performs with the Interference Pattern which is non-linear (Sine) and one solution by operating the FOG in a Closed Loop where the function is linear at "Zero" crossing. A technique we developed which shifted the Optical Frequency of the FOG Laser Signal by means of a Serrodyne Function to "Close the Loop" operating at the Interference Sine "Zero" crossing, and later patented such (5339055).Best,
MicroAmmeter I never saw before (Simpson 374) - Page 1
Forum section: electronics / general

author: watchmaker
author_rank: Unknown
timestamp: October 30, 2024, 05:44:09 pm
content: Simpson 374. It is well damped. Given the meter chamber is a seperate chamber and gasketed. I presume it uses a vane opposing the air in the chamber.No adjustments. It agrees at fullscale and 1/2 scale with my Agilent 1252A and my still in calibration USA Fluke 27FM (Ends this month, of my). These are my inhouse references.There are no adjustments other than the pointer zero.It looks like it was made specially for labs and academic institutions where it was expected the user would know it is to be used on its back (4 bumps/feet).The damping and "Shorting" function is nice to have for checking leakage on my capacitor leakage tester. I am sure there are other uses for taking the meter out of the ckt without rewiring.Very small footprint 78mm X 150mm.Found nothing about it using Google. Even Simpson260 has no info.
Invention of the day:  The TH labelizer - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: October 28, 2024, 10:58:01 am
content: Tadaaamm!!! Proudly announcing today the mirabulous invention of the TH labelizer for individual components!!!Made out of casual paper sheet folded 4 times along the entire length- fold, pierce first, then insert and label each component- fold corner to lock the open/close lid- useful when must attach an ID or a measurement/comment for each individual component- this way of storing isveryresilient against page shaking, handling, drop, roll, bend, etc., the components won't fall- additionally foldable to further store or pocket the page- individual paper sheets can be punched then filed in binders- undetached pages of a notebook can be used to file components- in case of automated testing batches of componentsthe individual values may be written on paper in advance with a printer, before inserting each component into paper.
WOW retro-tech, the new Casio ABL-100WE-1BEF step tracker - Page 1
Forum section: electronics / general

author: DiTBho
author_rank: Super Contributor
timestamp: October 26, 2024, 04:18:16 pm
content: This watch has a very 90s look! but!But it is very modern as it must (my speculation) integrate a MEMS accelerometer to track stepsand a radio link to communicate via Bluetooth with a smartphone app.The cool thing is that you can set all the parameters of the watch via the app.It costs ~ 80..90 euro on Amazon.Very impressed(I wonder if it's interesting to hack the radio part, I mean the protocolto create an opensource application that runs on GNU/Linux ...if someone hasn't already done it)
quote of the day  - Page 1
Forum section: electronics / general

author: pcmad
author_rank: Regular Contributor
timestamp: October 13, 2024, 12:55:37 am
content: digital meters are superior in almost every way they're much smaller much lighter easier for the civilian to decipher the measurements and they have no moving parts and so they'll still hold calibration after years and years of bouncing around in a toolbox you see moving parts are like women they make things interesting and they're a joy to fiddle around with but when they start drifting out of calibration you start longing for the stability of silicone

author: xrunner
author_rank: Super Contributor
timestamp: October 13, 2024, 01:07:48 am
content: Quote from: pcmad on October 13, 2024, 12:55:37 amFor stability I'd choose silicon myself.

author: Xena E
author_rank: Frequent Contributor
timestamp: October 13, 2024, 07:28:02 am
content: LMAO(And no, it's not made of silicone.)

author: RJSV
author_rank: Super Contributor
timestamp: October 20, 2024, 12:56:52 am
content: I've come here with a QUOTE, and from a (moderately) famous individual.Expected some postings, like from Winston Churchill or similar...?AND, I had google, looking up LMAO. Now I've grown, a little. Here is my 'famous':"Can anybody here tell me; What does RICK do any good, here ?"- - My boss, Dennis Peron in a staff meeting at the SF CBC, 1996. (I was working there, the first open Buyer's Club, for medical cannabis).I've got more.

author: tggzzz
author_rank: Super Contributor
timestamp: October 20, 2024, 09:16:09 am
content: Quote from: RJSV on October 20, 2024, 12:56:52 amI'm not quite sure what you are trying to say, but I presume that's "I've got more cannabis".

author: tom66
author_rank: Super Contributor
timestamp: October 20, 2024, 09:31:37 am
content: He was ahead of his time...

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: October 25, 2024, 08:32:47 pm
content: “We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.”― Niels Bohr
Problem activating hidden BIOS options using the AMIBCP utility. - Page 1
Forum section: electronics / general

author: papadance
author_rank: Newbie
timestamp: October 23, 2024, 11:24:54 am
content: Hello,This is my first time trying to activate hidden options in BIOS using AMIBIOS.In the attached screenshot (blue background) I am trying to display this option (to be sure I added "3" at the beginning and "(4-pin)" at the end). I selected USER and nothing is displayed, why?1-The smart fan function (as a subgroup) is active and visible from the very beginning.2-The CPU fan setting (inactive) is visible from the very beginning. I added the word "niekatyne" myself to distinguish the options.Please advise what to do to start handling fan setting 1 "3-Fan setting 1 (4-pin), this is handling an external fan.RegardsPiotr

author: coromonadalix
author_rank: Super Contributor
timestamp: October 24, 2024, 04:16:30 pm
content: no need to duplicate post, you have been warned ... go to Dr-Bios forums if eevblog does not satisfy you ...
AC input power measurement accuracy in AC/DC power supply unit - Page 1
Forum section: electronics / general

author: sruthisreenivas
author_rank: Newbie
timestamp: October 23, 2024, 08:01:37 am
content: How can we improve the AC input power measurement accuracy for very low DC output loads below 10 % of maximum DC output power for a AC/DC power supply unit?Looking for solutions to improve accuracy in the range of +/- 5%. Kindly provide solutions.
3Phase, resistive load calculation - Page 1
Forum section: electronics / general

author: jdev99
author_rank: Regular Contributor
timestamp: October 23, 2024, 05:20:17 pm
content: I want to confirm how to calculate the current in a 3 phase (400V) circuit, for a 12kW heater element (3 elements connected in delta).A coworker says I am wrong, and maybe I am.I think it is like this:I = P / √3 x V x CosθI = 12000 /(1.732 x 400 x 1)I=17.32AIs this right or wrong?

author: schmitt trigger
author_rank: Super Contributor
timestamp: October 23, 2024, 05:48:24 pm
content: You are correct.Your calculation shows the per-phase current.

author: jdev99
author_rank: Regular Contributor
timestamp: October 23, 2024, 06:04:47 pm
content: The last time I looked at 3 phase formulas was about 30 years ago, glad I kind of remember still something.

author: TimFox
author_rank: Super Contributor
timestamp: October 23, 2024, 06:05:37 pm
content: My mnemonic for calculating three-phase power for balanced loads:Assume 208 V rms phase-to-phase (common in US), with the same value of line currentIfrom the source into each phase.That corresponds to 120 V rms, phase-to-neutral (where the neutral wire may or may not exist, depending on Wye or Delta transformer secondary, respectively).Connect three resistors, one from each phase to neutral, each with (208 V)/(31/2) = 120 V across it, and the line currentIthrough each.Since the currents through the resistors are independent, the total power is given byPtot= 3 x (120 V xI) = (31/2) x (208 V) xI.

author: jdev99
author_rank: Regular Contributor
timestamp: October 23, 2024, 06:20:42 pm
content: Yes, that is also a nice way to remember it.

author: ejeffrey
author_rank: Super Contributor
timestamp: October 24, 2024, 04:52:05 am
content: Quote from: jdev99 on October 23, 2024, 05:20:17 pm17.3 amps is the phase current. The current in the resistance elements is 10 amps each.

author: jdev99
author_rank: Regular Contributor
timestamp: October 24, 2024, 12:45:46 pm
content: Correct, I was looking for the phase current.
activation of hidden settings in AMI BCP - Page 1
Forum section: electronics / general

author: papadance
author_rank: Newbie
timestamp: October 24, 2024, 04:54:55 am
content: Hello,Has anyone on the Internet found the manual for AMIBCP ver. 5/02I have a problem with displaying hidden settings related to Fan 1 PWM.Currently, Aptio Setup - AMI displays Fan CPU settings.Peter

author: Halcyon
author_rank: Unknown
timestamp: October 24, 2024, 05:21:56 am
content: Duplicate post.
Panel connections - Page 1
Forum section: electronics / general

author: PlainName
author_rank: Super Contributor
timestamp: October 20, 2024, 03:30:46 pm
content: Looking at a front panel and the particular way it's wired is puzzling me. There are 7 possible connections, all used, and 6 buttons. Two pairs of the buttons are wired in a way that suggests some kind of array scanning would be used to save connector pins, but it doesn't make any difference - with or without it takes 7 pins.The other possibility is layout. It's single-sided FPC type stuf (with domed metal buttons) but there is no problem with the layout - it would happily be singled-sided either way.Am I missing something?Edit: fixed schematic

author: nctnico
author_rank: Super Contributor
timestamp: October 20, 2024, 04:08:01 pm
content: The only thing I can come up with is that pressing left/down and/or right/up at the same time is prohibited and enforced through hardware. Would that make sense for the machine the front panel is from?

author: PlainName
author_rank: Super Contributor
timestamp: October 20, 2024, 04:46:25 pm
content: Not that I'm aware, and I can't imagine why it would be those keys if there was.It's from a Stihl robot mower, BTW.

author: xvr
author_rank: Frequent Contributor
timestamp: October 21, 2024, 11:01:50 am
content: Are you sure that schematic is right? UP button is short-circuited.

author: PlainName
author_rank: Super Contributor
timestamp: October 21, 2024, 12:37:11 pm
content: Well spottedFixed now. Amazingly I used it to wire a replacement and didn't notice the problem but still wired it correctly anyway

author: ajb
author_rank: Super Contributor
timestamp: October 23, 2024, 02:52:55 pm
content: Maybe a previous design iteration had more buttons, where scanning made sense, and they didn't bother rearranging the remaining ones when the others were removed?

author: Ian.M
author_rank: Super Contributor
timestamp: October 23, 2024, 03:06:19 pm
content: Are there other switches connected to the main board? If so and the panel connector goes to a bunch of diodes, they could all be part of one matrix with a diode in series with each switch so they can all be read individually. Min. matrix size would be 4x2, and assuming an inverter (maybe just a transistor) to drive the extra row, that gives you 8 switches on 5 GPIO pins for the cost of 8 diodes and a jellybean transistor.

author: PlainName
author_rank: Super Contributor
timestamp: October 23, 2024, 03:08:08 pm
content: Possible. This is a fairly old (in modern terms!) design and I don't think there was a previous one of any substance. Maybe it was copy-pasta from Stack Overflow

author: PlainName
author_rank: Super Contributor
timestamp: October 23, 2024, 03:11:17 pm
content: QuoteNot that I'm aware of. Handful of ports (wire signal sensor, stepper motors, rain sensor) but no switches. In a totally enclosed box too (but with a multitude of flashing LEDs that no-one would see in normal circumstances - someone was practising for their Xmas tree I reckon.
EDN 1994 Design Idea: Spice does thermal analysis - missing files - Page 1
Forum section: electronics / general

author: busaboy
author_rank: Contributor
timestamp: October 22, 2024, 04:44:04 pm
content: EEVblog member @mawyatt wrote an EDN Design Idea in 1994 titled "Spice does thermal analysis". Unfortunately EDN doesn't provide access to old content and Mike doesn't have the Spice files anymore.Can anyone help with di1576z.zip?https://www.edn.com/edn-access-08-18-94-spice-runs-thermal-analysi/

author: Halcyon
author_rank: Unknown
timestamp: October 23, 2024, 05:55:12 am
content: Duplicate topic:https://www.eevblog.com/forum/eda/edn-1994-design-idea-spice-does-thermal-analysis-missing-files/
Decapping of ICs and removing soldermask/references with diode laser? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: October 21, 2024, 11:32:34 am
content: Has anyone ever done this, or knows if this is possible?Its very hard to find specific information about this. And there are so many youtube videos, but no one really tests intereseting/different materials.

author: magic
author_rank: Super Contributor
timestamp: October 21, 2024, 05:30:49 pm
content: Only this comes to mind:https://zeptobars.com/en/read/laser-decapsulation-fail-not-so-fast

author: eTobey
author_rank: Super Contributor
timestamp: October 22, 2024, 06:45:42 pm
content: Thanks.Good to know, that a 4-digit price laser is not as epic as one would think. At least it doesnt work without quite a bit of tweaking.

author: coppice
author_rank: Super Contributor
timestamp: October 22, 2024, 06:54:09 pm
content: People decapping for a living in failure analysis labs would love a non-messy way to reliably decap. They use the chemical approach, so I guess the history of other approaches is not good.

author: Kim Christensen
author_rank: Super Contributor
timestamp: October 22, 2024, 06:59:26 pm
content: Check out the user "Noopy" on this forum.They post all kinds of decapping pictures and how to's.
ID wanted: hermaphroditic terminal  - Page 1
Forum section: electronics / general

author: billtodd
author_rank: Contributor
timestamp: October 22, 2024, 12:57:23 pm
content: Hi all,Anyone recognise this type of connector terminal. The pins are hermaphroditic but I don't think the cases wereThey were popular a few decades ago when I was just an old man.Bill

author: Andy Watson
author_rank: Super Contributor
timestamp: October 22, 2024, 01:22:10 pm
content: Looks like the sort of pin that would be found in those rectangular multipole connectors. E.g.https://edac.net/products/rectangular-connectors/147

author: oPossum
author_rank: Super Contributor
timestamp: October 22, 2024, 02:12:49 pm
content: https://edac.net/products/edacon-hermaphroditic-contact-design/176

author: billtodd
author_rank: Contributor
timestamp: October 22, 2024, 04:03:41 pm
content: EDAC yes !Thanks guys
Speaking of cloud software.... - Page 1
Forum section: electronics / general

author: watchmaker
author_rank: Unknown
timestamp: October 22, 2024, 12:44:40 pm
content: For those who use Trails.com: Did you know the user agreement allows them to poach your photos?And all those pros that had Google rifle though their albums to profit on their AI??I was educated in data analysis when social security numbers were still sacrosanct. Brave new world that now enriches Cambridge Analytical.I am not as extreme as Gene Hackman in Enemy of the State, but I think it is socially imperative that people jealously guard what privacy they can.
Embedded Muse 500, the final one! - Page 1
Forum section: electronics / general

author: YTusername
author_rank: Regular Contributor
timestamp: October 21, 2024, 03:43:51 pm
content: It's sad to see "The Embedded Muse" newsletter come to an end. The community will certainly take time to come up with an alternative newsletter with a similar audience.Quote

author: typematrix
author_rank: Contributor
timestamp: October 21, 2024, 10:25:56 pm
content: Jack Ganssle work has been a valuable resource for many professionals and enthusiasts alike, providing insights, tips, and discussions on various aspects of embedded systems. His passion for sharing knowledge and fostering a sense of community is truly commendable. I will miss the 'embedded muse'.
Fan creates Xbox portable console with real hardware - Page 1
Forum section: electronics / general

author: Bryn
author_rank: Regular Contributor
timestamp: October 21, 2024, 01:21:08 pm
content: Quotehttps://www.timeextension.com/news/2024/10/fan-creates-a-first-of-its-kind-xbox-portable-using-real-hardware---This emerged months after Xbox CEO Phil Spencer said that the company would release their own, but so far there had been no official update on that. If Phil finds out about this, perhaps he could hire him?
Does xgecu t48 support sn-adp-vga? - Page 1
Forum section: electronics / general

author: abdolah
author_rank: Regular Contributor
timestamp: October 22, 2024, 09:37:50 pm
content: Hi guys, I bout the xgecu t48 and I want to flash TV through VGA or HDMII search for an adapter to it but couldn't find, I only found it for t56 only but not compatible with my t48If anyone knows an adapter or a way to flash through VGA or HDMI using xgecu t48 please let me knowThanks for your time

author: coromonadalix
author_rank: Super Contributor
timestamp: October 28, 2024, 03:26:09 am
content: normally you would try to know the required pinouts / pins of the vga and hdmi id's eeprom pins and design your own version ?theses pins are known thru the web ...

author: picburner
author_rank: Frequent Contributor
timestamp: October 28, 2024, 06:04:26 am
content: The user manual specifies that only T56 supports this feature.
Issue Posting Data to Google Text-to-Speech with SIM808 - Page 1
Forum section: electronics / general

author: ratandalei2015
author_rank: Newbie
timestamp: October 20, 2024, 08:25:24 am
content: Hello,I am currently using the SIM808 module and would like to post data to the Google Text-to-Speech converter. I am utilizing Hercules to send AT commands to the SIM808. However, I am encountering an issue when trying to post data via HTTP; I consistently receive an error code 601.For testing purposes, I tried posting to ThingSpeak, and that worked fine. However, when attempting to post to Google Text-to-Speech, I am unsuccessful. To verify the URL, I tested it in Postman, and it worked correctly.Can anyone provide guidance on how to resolve this issue with the SIM808?[POSTMAN example]file:///C:/Users/hp/OneDrive/Desktop/postman_c.jpg[Hercules AT comand]file:///C:/Users/hp/OneDrive/Desktop/hercules.jpgThanks & RegardsRatan Dalei
Five Days Wasted Debugging - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: October 22, 2024, 05:42:35 pm
content: I had a new experience debugging that took 5 days to solve. Maybe the solution will help someone else.I am working on my project for NC of a 1965 toolroom lathe, parts of which are the subject of some other threads here. In brief, I will be using a pair of 30+ year old Mitutoyo scales and MCU (currently PIC16F1783). Most of the major sections of that code, including a keyboard read, have been developed, and it was time to assemble on a breadboard. I usually use a solderable breadboard and solder the MCU. This time, I elected to use a Mill-Max 28-pin socket. The LCD is 192x64 and has a single ST7525 controller.Five days ago, it was time to do hardware debugging, and I started getting bizarre results from entries on the 5-column 4-row keypad. Columns are read first and read correctly, but the rows were odd. I use IOC's for those corresponding pins. Some keys gave the same results as other keys in the same column. Some keys gave no response or gave an error. A Watch screen indicated IOCxF values such as 0x0000 1010 when the correct value should have been 0x0000 0010. Hair pulling time. I redid parts of the code where I had taken short cuts, added code to refresh registers, and checked for shorts. None of that changed or found anything. I did not have another 16F1783 to test, so switched to a 16LF1783. That was particularly hard to get into the Mill-Max socket, and it didn't work.Back to the original 16F1783 that was carefully inserted, but not completely seated as it had been before. BINGO. Everything started working perfectly. I am assuming it is a rectangular peg in a round hole problem. I can't rule out that maybe some contaminant was in the round holes of the socket and prevented appropriate contact. I usually go with Mill-Max machined pins for reliability but will probably go back to soldering MCU's in the future, because insertion force is quite high for that number of pins.Bottom line, I ordered some TE IC sockets with flat contacts and additional 16F1783's. For the $2.75 cost of a 16F1783, which is potentially lost when soldering it to the protoboard, I spent many hours head scratching and editing code.Edit: Corrected the LCD controller to ST7525

author: eTobey
author_rank: Super Contributor
timestamp: October 22, 2024, 06:49:27 pm
content: I feel with you. I am debugging a mcu too, and it behaves strange too. But i dont think is a connection issue. But maybe this is a foolish thinking? Signals look good on the scope though.
Any luck on using AI to convert PSPICE models to various other spice models? - Page 1
Forum section: electronics / general

author: sourcecharge
author_rank: Regular Contributor
timestamp: October 21, 2024, 04:47:37 am
content: Has anyone thought about using AI to convert spice2 subcircuit models to spice3f5 subcircuit models or other types of spice?Pspice is using spice2 while some simulation spice uses spice3f5.There are others too I think, but converting betweeen the spice models seems like something AI would be great at doing for large databases of parts.Let me know if you have experience using AI to program or convert spice2 to spice3f5, or any other spice and your opinion on how well AI could be used for this task.Thanks.
Recommend me a thermal conductive material - Page 1
Forum section: electronics / general

author: hap2001
author_rank: Regular Contributor
timestamp: October 15, 2024, 11:37:24 am
content: Hi, I'm looking for something like a thermal pad, but more tough. It need to be:Thermally conductive,Electrically isolated,Withstand up to 110 degree C,Not degrade over several years,Easy to deform elastically,Difficult to deform plastically,Lower hardness than bare silicon die,Available in sheet form of < 1mm thickness.A normal thermal pad for computers is almost okay except the mechanical strength, What's your suggestion? Thanks.

author: David Hess
author_rank: Super Contributor
timestamp: October 15, 2024, 12:19:29 pm
content: You did not say how high the voltage is.What about Kapton or mica?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 15, 2024, 02:35:02 pm
content: What does the joint look like?Low-modulus (soft elastic) materials are at odds with the "difficult to deform plastically" (implied: high yield strength) requirement. What do you really need? What alternatives have you considered in joint design, and why have you gone down a route with a potentially impossible requirement (is this an X-Y problem)?Tim

author: hap2001
author_rank: Regular Contributor
timestamp: October 16, 2024, 11:05:43 am
content: Quote from: David Hess on October 15, 2024, 12:19:29 pmLess than 30 volts.
Open Source Analog ASIC design: Entire Process - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: October 09, 2024, 12:24:06 pm
content: https://xschem.sourceforge.io/stefan/index.html

author: nctnico
author_rank: Super Contributor
timestamp: October 09, 2024, 10:57:25 pm
content: The open source IC design tools are nothing new; these have been available since the mid 1990's (or even earlier). It would be nice if there is a place where you can have your IC designs produced for a reasonable amount of money. Nowadays having PCBs made is like 100 times cheaper compared to the 1990's.

author: MT
author_rank: Super Contributor
timestamp: October 10, 2024, 11:35:27 am
content: Yes i know and they where sort of crummy.https://europractice-ic.com/services/fabrication/Chinese MPW on older/larger geometries?Bedoroom manufacturing?https://www.aist.go.jp/sst/en/exhibition/innovation_zone/zone21/index.html

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 10, 2024, 09:26:06 pm
content: You have the SkyWater PDK:https://github.com/google/skywater-pdkand SkyWater has attractive prices for open-source projects compared to usual foundries, but it's still not cheap.He mentions it. He also mentions TinyTapeout, which allows you to have your own chip manufactured at "low"' prices, although with very limited characteristics for now.Otherwise, yes you have various MPW services, but it's not cheap either. It's fine for universities and small to medium companies, but certainly not for individuals, unless you have a lot of money.The issue with "traditional" MPW is the EDA tools. Most only support the commercial ones, which are excessively expensive.So SkyWater is an alternative for now. Downside is that you have to make your design open-source if you use the open SkyWater PDK, although I haven't had a deep look at the licensing details. And it'll still cost you several thousands of euros/dollars to prototype a small chip, but it won't be the tens to hundreds of thousands you'd otherwise have to shell out. Yep, still a very expensive activity. But a very unforgiving one as well. Make any kind of small design mistake, and that could be thousands of bucks down the drain.https://www.skywatertechnology.com/sky130-open-source-pdk/https://efabless.com/https://tinytapeout.com/
2.6KV 100UF capacitor, is there any way to repair the capacity? - Page 1
Forum section: electronics / general

author: daisizhou
author_rank: Super Contributor
timestamp: October 12, 2024, 02:14:47 am
content: I don't know why the capacitance of this capacitor always decreases.I used an LCR meter to test the capacitance and found that their capacitance values ​​were all less than 96.5uf.I took one apart and checked the inside and found no dielectric oil.It looks like it's the dry type.If you know how to improve it, please let me know, thanks

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 12, 2024, 04:54:17 am
content: Looks like degradation from being operated near or above rated voltage. (So called "self healing" dielectric.) No practical fix, but if you derate the voltage, it would avoid further degradation.

author: amyk
author_rank: Super Contributor
timestamp: October 12, 2024, 05:10:25 am
content: 2.6kV 100uF?Are these from a microwave oven being operated on slightly higher mains than it was rated for (240V instead of 220V?)

author: daisizhou
author_rank: Super Contributor
timestamp: October 12, 2024, 06:53:54 am
content: ;)It comes from inside the philips m3536a.Normally the voltage will not be higher than the maximum rated voltage value marked.What is incomprehensible is that the capacitor is damaged.As far as I can remember, this type of capacitor is usually an oil-immersed metal case capacitor.The insulating oil is added last and the filling port is sealed with tin.
Porting .net to Win95 (Amazing breakthrough) - Page 1
Forum section: electronics / general

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 11, 2024, 07:16:06 pm
content: It's not about .net (Who cares anyways), but the way this guy overcomes every obstacle.Loved the video, I'm sure you'll enjoy too!His other videos are little gems too for anyone that likes hacking, disassemblying etc.
IGBT Modules - Page 1
Forum section: electronics / general

author: Bill
author_rank: Contributor
timestamp: October 10, 2024, 01:41:04 pm
content: Hi everyone,I’m currently working with the UM150CDY-10 IGBT module (attached image) and wanted to ask if any of you have encountered similar modules in your projects.I'm particularly interested in your testing methods to determine whether the module is still fully functional or not. What’s your process for diagnosing these?What equipment do you use for testing?What procedure do you follow for testing the IGBT both under load and when it's powered off?Are there specific parameters you focus on, such as switching times, power losses, etc.?Do you rely on a diode tester, oscilloscope, or more advanced methods like load-based testing benches?I’d appreciate any insights or recommendations to ensure accurate and reliable diagnostics.Thanks in advance for your feedback !
Deutsch Connector Contact Compatibility - Page 1
Forum section: electronics / general

author: MarginallyStable
author_rank: Regular Contributor
timestamp: October 09, 2024, 07:53:19 pm
content: So I'm looking for a connector series to utilize for a project and found the deutsch HDP20 line that pretty much gets me what I want. These utilize common deutsch contacts (mainly interested in sizes 12, 16, 20). I found some hints online that mill spec M39029/4,5 contacts can be used in place of the deutsch branded contacts. Can anyone verify this?Then I also ran into AMP AHDP series which look almost identical to the deutsch, and I can find cheaper. These use what AMP calls its common A series contacts. Does anyone know if these are also compatible with the mil spec contacts?Would appreciate any information about cross compatibility with different brands of these "common contacts" and with mil spec. Are the HDP20 and AHDP connectors cross compatible in general? (would be nice to have a second source)
Any decent alternatives to TheTVDB.com ? - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: October 18, 2024, 12:36:37 am
content: Hi guys. I've been using TheTVDB to pull series/episode information on my Plex server for quite some time. Recently, I've had an issue where there were two duplicate series' on TheTVDB and I've logged a support ticket months ago to have the incorrect duplicate removed (it contains completely inaccurate episode names, artwork etc...), and there is no way to edit episode information once it's been added. Months have gone by and there has been no response to the support ticket, which remains open.Additionally, I noticed that they even deleted the CORRECT series, leaving only the buggered up version.It seems like TheTVDB isn't really all that interested in accurate information, or providing support to it's users.Does anyone use anything else? IMDB seems to be the obvious choice, but how does it go with TV series (as opposed to just movies)?

author: sleemanj
author_rank: Super Contributor
timestamp: October 18, 2024, 01:24:40 am
content: TMDB -https://www.themoviedb.org/Despite the name, covers TV episodes as well.

author: Halcyon
author_rank: Unknown
timestamp: October 18, 2024, 06:30:29 am
content: Quote from: sleemanj on October 18, 2024, 01:24:40 amGood suggestion. Actually has a decent interface where you can edit and correct attributes without need to log a support ticket every time.

author: Halcyon
author_rank: Unknown
timestamp: October 18, 2024, 07:42:37 am
content: So TheTVDB got back to me (finally) about the incorrect record. Their stance is as follows:By TVDB rules, the earliest created record is always the one that remains when duplicate records are discovered.So rather than using judgement and actually checking what is correct or not in their database, they just apply their "rules" without any further thought. Doesn't fill me with a lot of confidence, especially considering that once an episode is created, no one can edit it except for the moderators. That means that if an entire series is entirely messed up, too bad so sad. Looks like I'm not going to be relying on their data any longer.
Username change - Page 1
Forum section: electronics / general

author: brainrape
author_rank: Newbie
timestamp: October 04, 2024, 07:11:31 pm
content: hi there i messed up at registration and used my email as usernamewould it be possible to change the username to "brainrape" if thats appropriate if not just "lauterer"tiaPatrick

author: Zero999
author_rank: Super Contributor
timestamp: October 04, 2024, 07:36:57 pm
content: Yes, you'll get spammed to buggery. SendDaveorGnifa private message.The forum software shouldn't allow you to use your email as your username. It'd not difficult to code.

author: brainrape
author_rank: Newbie
timestamp: October 04, 2024, 08:58:11 pm
content: kk thx ive contacted gnif

author: Halcyon
author_rank: Unknown
timestamp: October 05, 2024, 03:39:38 am
content: Done.

author: Bryn
author_rank: Regular Contributor
timestamp: October 05, 2024, 11:46:11 am
content: Quote from: Zero999 on October 04, 2024, 07:36:57 pmI've seen a few people with their email addresses as their usernames, and if it's going to be a major security risk as you said, maybe Dave should look into it? (perhaps prohibiting usernames containing "@" would be the first step).

author: magic
author_rank: Super Contributor
timestamp: October 05, 2024, 02:23:56 pm
content: There is somebody here called "Bored@Work" or something like that.I remember when Dave enabled some security thing on this forum which ended up hiding his username to protect him from spamHowever, I don't recall anyone having "xxx@yyy.zzz", so perhaps this pattern could be blocked without harm.

author: Bryn
author_rank: Regular Contributor
timestamp: October 05, 2024, 02:31:59 pm
content: Quote from: magic on October 05, 2024, 02:23:56 pmI've seen a few myself recently though... but yeah, it doesn't occur often.

author: magic
author_rank: Super Contributor
timestamp: October 05, 2024, 03:03:57 pm
content: I mean, I don't recall anyone using this kind of username which was not an email address.Yes, there was a few, but I think most of them did the same as the OP here.

author: Ian.M
author_rank: Super Contributor
timestamp: October 05, 2024, 03:26:11 pm
content: Pulling stats from the list returned by searching for members matching @ in only their user name, as of a few minutes ago, there were 349, of which 261 appeared to have an email address*as their user name, and 186 of those have posted. There are 83 who use @ in the sense of 'at' or belonging to, or to replace the letter a or just to ornament their user name.Getting these stats didn't need any admin access or special skills other than copy/pasting into a local spreadsheet that for privacy reasons has been discarded without saving.* i.e. without spaces, containing only one @, with one or more . after the @ and ending in a valid TLD.

author: Halcyon
author_rank: Unknown
timestamp: October 07, 2024, 03:02:07 am
content: Perhaps if it's possible to modify the registration form to explain that the username is visible to the public, perhaps people wouldn't make that mistake.