hybridfree/eevblog-posts huggingface dataset:
Automotive Mass Air Flow Calculation - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: July 31, 2022, 12:06:36 pm
content: Does anyone knows the formula for calculating the mass air flow in gr/sec a M.A.F. sensor should report in normal operation?I know we need Engine Capacity (CC3), Engine Speed (RPM), Intake Absolute Pressure (mbar), Air Temperature (Celcius). There is this calculatorhttps://tfautomotive.co.uk/tech-assist/calculators/mass-air-flow-calculatorTesting various values I can see that the result is analogous of the above quantities. Doubling any of them doubles the results (for the temperature the doubling is for in Kelvin).

author: HighVoltage
author_rank: Super Contributor
timestamp: July 31, 2022, 12:24:46 pm
content: This one worked for me:MAF [g/s] = Mair ∙ Vd ∙ nvol ∙ (MAP – (patm/CR)) / (R ∙ IAT)where:Mair is molecular weight of air of 28.9 g.mol-1Vd is engine displacement volume in dm3nvol is dimensionless engine volumetric efficiency multiplierMAP is intake manifold absolute pressure in kPapatm is barometric pressure in kPaCR is dimensionless engine compression ratioR is universal gas constant of 8.314 J.mol-1.K-1IAT is intake manifold charge temperature in Khttp://archive.sciendo.com/MECDC/mecdc.2014.12.issue-1/mecdc-2014-0002/mecdc-2014-0002.pdf

author: HighVoltage
author_rank: Super Contributor
timestamp: July 31, 2022, 12:30:52 pm
content: A rule of thumb is:1 g/s at idle per cylinder or just below.Depending on the engine, you can reach 250 g/s or 900 kg/h going through the MAFS at full load.

author: firewalker
author_rank: Super Contributor
timestamp: July 31, 2022, 12:33:23 pm
content: I guess the use a standard value for nvoland the CR depends if the engine is petrol or diesel.Alexander.

author: bdunham7
author_rank: Super Contributor
timestamp: July 31, 2022, 02:00:13 pm
content: I'm not sure what exactly you are trying to do, but estimating mass air flow so as to compare it to an actual measured flow has at least two significant obstacles that limit how close you can get. One is that volumetric efficiency can vary quite a bit on some engines and the other is that some mass air flow sensors measure reversion additively and this has to be accounted for in the ECM design.

author: firewalker
author_rank: Super Contributor
timestamp: August 01, 2022, 07:42:48 am
content: The calculators (like the one in my first post) can help a technician diagnose a malfunctioning MAF sensor. You compare the values when in idle. I was wondering hoe are they guessing the mass air flow.Alexander.

author: HighVoltage
author_rank: Super Contributor
timestamp: August 01, 2022, 09:20:28 am
content: The malfunction of a MAFS can be of many aspects and not only the output signal. Some cars measure the supply current to the MAFS within a window and set a error code, if the current goes outside this window.Many years ago I built a big MAFS test stand for a customer to find MAFS problems. And this showed the biggest problems exist during acceleration of the airflow during the first 25 to 50 ms of load change.
SkyWater Open Source PDK - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 02, 2022, 07:15:26 pm
content: Does anyone have experience with the SkyWater Open Source PDK here and would like to share?https://github.com/google/skywater-pdk

author: Weston
author_rank: Regular Contributor
timestamp: August 02, 2022, 08:24:23 pm
content: I taped out a buck converter on the SKY130 PDK as part of a graduate class I took.Still working on documentation, but all the work is on github:https://github.com/westonb/Open-PMIC-tapeoutI got the IC back and it works, at some point I threw together a powerpoint on some of the test results:https://docs.google.com/presentation/d/1PC-O1CdMnBhfDeytuiA5FrbG7Jn2NufCA-8EJRJ2sE0/edit?usp=sharingI would say its really cool that a modern PDK is fully open source. From an educational perspective there is going to be a big benefit that students can work with a real PDK and real device parameters. I learned a lot just going through the PDK. For example, it taught me that the PMOS/NMOS transistors in logic gates are actually sized differently than the "optimal" way taught in digital design classes.From a commercial perspective its a bit unclear how successful its going to be as the tooling is pretty rough. I found and reported a number of bugs in the Magic VLSI software when designing my IC and there are still issues with full parasitic extraction in the layouts and no way to check or model the current density in the design or anything related to device lifetime or reliability. I mostly did analog layout but I think the toolchain for digital place and route is more mature, especially as it uses the foundry provided standard cell libraries. Less to go wrong there.With the paid shuttle service you get ~10mm^2 of silicon for $10k, which is pretty amazing. If you are a startup trying to get something silicon proven it could be pretty compelling.
UTG 962 ARB Download - Page 1
Forum section: electronics / general

author: wings515
author_rank: Newbie
timestamp: July 22, 2022, 01:33:05 pm
content: I am trying to transfer a waveform file from the UTD 2152 scope to the UTG962 Function Generator. According to UNI-T the file formats are incompatible. Does anyone know of a way to take either the .csv or .bmp files on the 2152 and convert them into anything the 962 will accept? The only file type the 962 will accept is a .bsv format. Whatever that may be.My problem is the signal for replication is a complex ignition pulse going to the primary of the ignition coil.I have converted the basic points and condenser to a Pertronix electronic ignition. This is installed in a 6-volt positive ground vehicle but I have purchased a 6 to 12-volt boost device to be able to power a 12-volt tachometer. I need to design an interface circuit for the tach to take the negative primary pulses and convert them to positive pulses. The complex signal is a step followed by a pulse with the trailing edge having a lot of ringing.I do have the ability to write some code if that is a requirement.Thanks in advance.wings515
Farnell website not showing categories - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 20, 2022, 07:56:38 am
content: Hi,Has anyone noticed, the Farnell website has just stopped giving categories, eg when you typed "capacitor", it gave you a list of "Aluminium Electro", "Ceramic MLCC"...now all you get is some individual part recomendations.It makes it very hard to search for simple stuff. Or have i just tripped it into some mode?

author: MK14
author_rank: Super Contributor
timestamp: July 20, 2022, 08:14:51 am
content: Quote from: Faringdon on July 20, 2022, 07:56:38 amFor me (going through their menus), I see a big list (with pictures) of different capacitor types. See link.https://uk.farnell.com/c/passive-components/capacitors

author: Faringdon
author_rank: Super Contributor
timestamp: July 20, 2022, 07:32:31 pm
content: Thanks, when i open that link, all i get is a row of pictures of recomended parts, which is not useful....as attachedI wonder if i have to reload my browser.I used to get the categories and it was good, but not any more........OK...Just tried Farnell on Microsoft Edge Browser and its OK.....So my Google Chrome Browser somehow got corrupted so it cant show the Farnell categories.

author: jc101
author_rank: Frequent Contributor
timestamp: July 20, 2022, 08:29:17 pm
content: clear your browser cache, solves many things such as this.
PSA: How to specify CRC for minimized pain - Page 1
Forum section: electronics / general

author: Siwastaja
author_rank: Super Contributor
timestamp: July 20, 2022, 11:18:48 am
content: Happens every single time. Give me product X to communicate with. After day or two of work, everything works; configuration, parsing, etc. Except I can't leave that CRC unchecked, really. So time to implement the small, trivial last thing, the CRC checking. Except this will invariably take one full day of work, including me googling how CRCs worked after all, writing brute-force reverse-engineering solvers, all this regardless how many CRC implementations I have seen, used or written. This is significant part of the whole project!So please, when you design a product and are writing the datasheet, regardless of how much pressure you get from above to keep the text "concise" by hiding relevant information, do for the sake of (deity) include all this information:1) Polynomial2) In which form the polynomial is3) Initial value4) Is input reflected5) Is output reflected6) xorout value7) Reference calculation i.e., one arbitrary input data (in hexadecimal) and the calculated CRC thereof8) Endianness of the result9) If any weird oddities like extra padding is involved, first remove such special snowflake stuff, and if unable, specify them completely10) Copy and paste C code which calculates the checksum. You have it already implemented anyway. Other languages may be acceptable. 1000 LoC of C++ which finally constructs boost CRC library is not.11) If said code is longer than 10 lines of code, or if it references any library, you are doing something wrong, retry until succeeded.Thank you in advance for not making bullshit products.And if at all possible, pick some really popular CRC. Copy-paste the full name and full description fromhttps://reveng.sourceforge.io/crc-catalogue/all.htm. Don't be the prick who uses CRC-16/CCITT-FALSE and calls it CRC-16/CCITT.
Why are radial fuses square? - Page 1
Forum section: electronics / general

author: crgarcia
author_rank: Regular Contributor
timestamp: June 05, 2022, 11:58:39 am
content: Maybe this is more of an english question, and I don't really understand what does radial actually mean. I'm asking here becaue I have the feeling it has more to do with some of the internals of the component:Why is this a radial fuse?https://ch.farnell.com/bel-fuse/0697a5000-01/fuse-radial-time-delay-5a-250vac/dp/2848627?mckv=_dc|pcrid|586863766079|plid||kword||match||slid||product|2848627|pgrid|131580399982|ptaid|pla-1586519166231|&gross_price=true&CMP=KNC-GCH-GEN-SHOPPING-SMART-Test873-Low_ROASThanks!

author: Alti
author_rank: Frequent Contributor
timestamp: June 05, 2022, 12:06:11 pm
content: Hi. Radially in this context comes from the construction of cylindrical electrolytic capacitors which can have leads oriented radially (not in axis but offset, both on same side) or axially (in axis, one per side).Other components can also have same/similar construction. Most popular fuse designs with leads are actually axial, usually 5x20 with leads. The advantage of radial design is that you do not have to shape the leads to populate the board. You just cut the leads and put into THT holes. With radial design you need lead shaping (which comes at a cost and creates problems of its own).

author: eti
author_rank: Super Contributor
timestamp: June 05, 2022, 10:08:01 pm
content: Why are triangles round?

author: TimFox
author_rank: Super Contributor
timestamp: June 05, 2022, 10:14:43 pm
content: With square or disc-shaped capacitors, for example, "radial" means two leads in parallel (as in your picture) and "axial" means two leads diametrically opposed (like an old-fashioned resistor).The "axial" usage is obvious, and "radial" is a reasonable convention for the other thing.

author: vu2nan
author_rank: Contributor
timestamp: July 17, 2022, 03:25:55 pm
content: The terms 'axial' and 'radial' are used to describe the orientation of the leads of cylindrical components like resistors, capacitors, fuses etc.The fuse in question is one with radial leads, that has been moulded in an enclosure.

author: Brumby
author_rank: Unknown
timestamp: July 18, 2022, 05:20:43 am
content: The origin of the term "radial" has faded into insignificance and has evolved into its own meaning.As such, radial leads now refers to those which come out of the same side of a component, with no dependence on the shape of that component. Radial leaded components are typically seen on PCBs or large components that are chassis mounted.Axial leads retain the descriptive element of the term - sharing a common axis.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: July 19, 2022, 02:34:33 am
content: Some are round.Jeff
Louis Rossman Is Moving To Texas - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 21, 2022, 01:05:10 am
content: I can't keep up with the number of places he's moving too, but apparently he has sign a contract with a new "employer" and presumably now has to move to Texas.He was just scouting places in Florida, and even took his staff there to look around, but I guess he got an offer he couldn't refuse.New York sounds like the ultimate business shite-hole.

author: rfclown
author_rank: Frequent Contributor
timestamp: July 21, 2022, 05:01:52 am
content: I worked for a short time (my previous employer) for a Connecticut based company. The founder had retired and moved to Florida because as in NY, the state was going to shite for business owners. He had re-engaged with his company and opened a design center in Florida (where I live). He didn't want to move the CT business out of state because of all the longtime loyal CT employees that were there, but I heard him rant about how things were going to complete hell in CT and those that didn't get out would eventually die a slow death.

author: Bassman59
author_rank: Super Contributor
timestamp: July 21, 2022, 05:23:26 am
content: Wasn't he based in New York City?He was probably being fucked by his landlord.

author: JPortici
author_rank: Super Contributor
timestamp: July 21, 2022, 05:35:50 am
content: Didin't he publish a video recently about a benefactor based in texas which basically made R2R happen etc?

author: EEVblog
author_rank: Unknown
timestamp: July 21, 2022, 05:50:18 am
content: Quote from: JPortici on July 21, 2022, 05:35:50 amYes, I assume it has something to do with this. Seems like his donor might have turned into his employer. Hope it works out.

author: MrMobodies
author_rank: Super Contributor
timestamp: July 21, 2022, 06:28:02 am
content: Looks like they are finding as many ways as they can to apply tax:https://www.bloomberg.com/features/2022-new-york-real-estate-property-tax-reform/Quote
Avoiding "5000 MOQ" on searching for components on Farnell? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 14, 2022, 06:40:12 pm
content: Hi,Int he following thread...https://www.eevblog.com/forum/chat/farnell-website-is-very-slow-in-uk-why/50/...it wasnt asserted how to avoid the search engine giving you page loads of "5000 MOQ" items because you sorted on price...anybody know how to avoid say more than 100MOQ?I am searching for a SOT23 PNP <60V and its taking ages....i only need 30 max. Ill buy 100 if theyre a penny or 2 each, but wont order 5000.

author: ebastler
author_rank: Super Contributor
timestamp: July 14, 2022, 08:00:36 pm
content: The Farnell search should offer a "Packaging" filter. For me it shows at the very bottom, in the set of filters on the left side of the screen. If you only select "Each" and "Cut Tape", that should exclude the various full-reel packages.

author: tom66
author_rank: Super Contributor
timestamp: July 14, 2022, 09:52:18 pm
content: Use Octopart and select 'Farnell' as the distributor.Farnell's website is trash!
Building a Kelvin Bridge for Breaker/ATS Contact Measurements - Page 1
Forum section: electronics / general

author: akimbojimbo
author_rank: Contributor
timestamp: July 14, 2022, 12:49:31 am
content: Hello all,I'm wondering if someone could provide insight or experience on constructing and using a Kelvin Bridge? I have the need to measure the contact resistance of many large low voltage breakers (100-3000A, 120-480v) and am a bit put off by the cost of commerical milliohmeters. As such, I want to build myself a device for 4 point measurement of resistance, which I understand to be a Kelvin Bridge. I get the basic layout and concept of it, however all the pics I've seen show it being used on a 4 wire resistor. I can't wrap my head around how I can apply that to the two terminals of the single pole of a breaker?I'm familiar with doing a caveman style 4 point test: supply a known/controllable current to the item under test, then measure voltage drop across the test item while it is energized. I'm hoping there's something that I can make a bit more unitized to keep with me in the field.Any suggestions? Thanks!

author: Kleinstein
author_rank: Super Contributor
timestamp: July 14, 2022, 04:28:51 am
content: The main point is using 4 contacts / wires. With the breaker and other normally 2 wire parts this means ataching 2 wires to each side. With could be with something like clamps or just holding some of the tips. With 4 wires it is no longer impartant that the individual contracs are very stable. With a DC measurement for the low restance range one would however have to keep an eye on thermal EMF and holding the tips by hand is thus not such a good idea.The simple way is to get a resonable stable constant current source (e.g. lab supply for 1 A - though some of the low cost ones are not very stable) and than use a DMM to measure the current and votlage. One would still prefer a DMM with reasonable good resolution (e.g. 0.01 mV or ideally better).Instead of a specialized miliohm meter a reasonable good DMM with 4 wire ohms (usually a bench meter) may be sufficient.
Digikey shopping cart doesnt get saved? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 13, 2022, 02:17:30 pm
content: Hi,If you log in and out of digikey, should it save the shopping list?Presumably it must save the "My Lists" between log ins?Sorry but i did peruse their website to find this, but nothing

author: tom66
author_rank: Super Contributor
timestamp: July 13, 2022, 02:37:07 pm
content: If you log out, it saves the cart for that account and gives you a blank 'guest' cart.I don't know if it keeps the 'guest' cart when you log in, though.
Looking for example EE design/production legal contracts for a new project - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: July 10, 2022, 04:28:36 am
content: Hi,I will be starting a project with a new client and it will be a more 'professional' project than the kind I usually do, so I want to draft a more professional looking legal contract.Does anyone have any examples of good/generic EE project contracts that they are happy to share?Or know of any good online resources for electronic engineering contracts I could look at.The project will be from design and prototyping to production.I'm mainly looking for something I can use as a good starting point and customize as needed before I get my legal friend to look over it.Thank a lot.

author: Psi
author_rank: Super Contributor
timestamp: July 13, 2022, 07:47:28 am
content: No one has any they're willing to share , fair enough. I'm probably asking a bit much since you'd have to go to the trouble of removal identifiable company info etc.Thanks anyway

author: mag_therm
author_rank: Frequent Contributor
timestamp: July 13, 2022, 12:21:57 pm
content: If you will be a subcontractor to a client doing say product development or construction, it is likely client will have a pro-forma contract for all such subs.So you would take that to your legal provider (solicitor in Australia) for checking before signing.If you want a "professional" looking shop front glossy document, that is not really on legal side although solicitor could check it too when finished.You can also have terms of sale attached to your proposal. Usually the contract will include and over-ride that when contract is formed.TOS templates probably available suitable to use, again get solicitor to check.I used a firm of legal attorneys, and an accountant. overall their fees were reasonable , advice good, I always felt they were worthwhile.By the way, are you in a state that is requiring registration? I was RPEQ beacuase a few years ago it looked like I would be doing design calculations and modelling for Queensland end user.

author: Psi
author_rank: Super Contributor
timestamp: July 13, 2022, 01:10:01 pm
content: Thanks for replying,It will be registered company (mine) to another registered company.We will be designing and manufacturing the PCB and firmware part of a bigger product the other company sells.Na, don't need to be a registered engineer here, and the product has no mains connection.

author: mag_therm
author_rank: Frequent Contributor
timestamp: July 13, 2022, 01:20:59 pm
content: Sorry, mis-read your flag, too small on the hand held.I hope your project goes well.

author: tom66
author_rank: Super Contributor
timestamp: July 13, 2022, 01:29:01 pm
content: How valuable is the contract?If all goes wrong and it ends up in front of a judge, how much do you stand to lose if the judge doesn't see your side?If the amount is over, say, AU$20,000, I would recommend having a solicitor to draft one up for you.
Show us your 'Man Cave'. - Page 1
Forum section: electronics / general

author: Peter Taylor
author_rank: Regular Contributor
timestamp: July 10, 2022, 09:31:45 pm
content: Here is my man cave.I live with my mum in her three bay garage.My work area.My High Fidelity Guitar Amplifier prototype nearly finished.My living area.And no doors between.The perfect man cave.

author: Gyro
author_rank: Super Contributor
timestamp: July 10, 2022, 09:39:28 pm
content: Already covered on the forum (184 pages worth)...https://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/

author: Peter Taylor
author_rank: Regular Contributor
timestamp: July 10, 2022, 09:44:50 pm
content: And ?

author: Halcyon
author_rank: Unknown
timestamp: July 13, 2022, 03:44:18 am
content: Quote from: Peter Taylor on July 10, 2022, 09:44:50 pmMaybe you can contribute to that thread instead of starting a new one?

author: jpanhalt
author_rank: Super Contributor
timestamp: July 13, 2022, 09:33:36 am
content: Going back to your first deeply philosophical post here ...https://www.eevblog.com/forum/chat/i-have-found-the-answer-to-life-the-universe-and-everything/msg4189612/#msg4189612One might add that you cannot be an adult unless you have been a child. Have you considered taking that step? Get a job, move into your own place, and finish the guitar amplifier for your mom.
Electrons pushed towards surface? - Page 1
Forum section: electronics / general

author: aussie_laser_dude
author_rank: Contributor
timestamp: July 10, 2022, 09:13:39 am
content: Trying to understand a subtle electrodynamics problem within a long straight metal wire with a DC current.My understanding is that a line of moving charge produces a perpendicular electric field higher than a stationary line of charge. This perpendicular field should push charge carriers outwards to the skin of the wire and reach some equilibrium charge distribution, thus resulting in a negative skin, and positive core. Is this a known effect?I've been pondering this for a while and remembered there's some pretty knowledgeable guys here.Cheers

author: ebastler
author_rank: Super Contributor
timestamp: July 10, 2022, 09:32:19 am
content: Quote from: aussie_laser_dude on July 10, 2022, 09:13:39 amFor a DC current, i.e. charge moving at a constant speed, this understanding is incorrect. The current will produce a (stationary)magneticfield around the conductor, but no additional electric field.For AC currents, there is indeed an interplay between magnetic and electric fields, and the resulting "skin effect" in conductors is well-known:https://en.wikipedia.org/wiki/Skin_effect

author: aussie_laser_dude
author_rank: Contributor
timestamp: July 10, 2022, 11:15:53 am
content: Thanks for the reply, I believe the effect i'm describing is something very different from the skin effect, it works in DC and shouldn't change resistivity of the core/skin of a wire. I think i made the example too complex by using a conducting wire.Imagine an electron gun firing a line of continuous current in a vacuum. Is the perpendicular electric field of the charged beam stronger than a corresponding stationary beam? I believe it is, based on numerical integration of time retarded electric fields produced from a beam of moving charges. But I'm often wrong, hence there will probably be some reason why these models are wrong?

author: ebastler
author_rank: Super Contributor
timestamp: July 10, 2022, 11:22:01 am
content: Quote from: aussie_laser_dude on July 10, 2022, 11:15:53 amWhy would there be a "perpendicular electric field of the charged beam" at all? (Besides the radial field generated by any charge, whether stationary or moving at a constant speed.)As stated in the first paragraph of my earlier reply, charges moving at a constant speed do not generate additional electric fields. You must be mixing something up here, maybe with AC currents and the electromagnetic waves they generate, or maybe with Bremsstrahlung from accelerated (or decelerated) charges?

author: eugene
author_rank: Frequent Contributor
timestamp: July 10, 2022, 03:13:05 pm
content: I would add to ebastler's reply that constant speed can include 0; no current. The density of electrons is uniform in a hunk of copper sitting on a bench even though the electrons are in reality zipping around in every direction all of the time. Applying a constant DC current through the hunk of copper gives the electrons a net (average) motion in some direction, but the density remains uniform.
Electric watches/clocks...mechanical watches/clocks... - Page 1
Forum section: electronics / general

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 10, 2022, 01:46:39 am
content: I have not been spending much time here in the last couple of years because I gravitated to the watch/clock fora. My father was a watchmaker, but I became an electrical engineer...however, in retirement, I am reverting to watchmaking. I still get to use my electronics skills dealing with quartz watches and electrical clocks. It is a beautiful world!

author: niconiconi
author_rank: Frequent Contributor
timestamp: July 10, 2022, 01:51:27 am
content: You may enjoy this article on decapping the IC and crystal in a wristwatchhttps://3.14.by/en/read/quartz-wristwatch-watch-ic-decapsulation

author: andy3055
author_rank: Super Contributor
timestamp: July 10, 2022, 02:05:50 am
content: You should check this guy. Fantastic stuff!https://www.youtube.com/channel/UCSJ7LRO4GaHZdzowk2-7hJw

author: Muttley Snickers
author_rank: Unknown
timestamp: July 10, 2022, 02:26:07 am
content: It's about timethis forum had a proper thread about watches.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 10, 2022, 02:57:10 am
content: I wonder how long before we see a watch based on a chip scale atomic clock. At this point, such an atomic clock module exists, just a bit expensive.https://www.microchip.com/en-us/product/CSAC-SA45S

author: edpalmer42
author_rank: Super Contributor
timestamp: July 10, 2022, 03:31:48 am
content: Quote from: NiHaoMike on July 10, 2022, 02:57:10 amIt's been done, but I'm not sure I'd call it practical.https://www.ablogtowatch.com/bathys-hawaii-cesium-133-atomic-wrist-watch-accurate-second-1000-years/

author: edpalmer42
author_rank: Super Contributor
timestamp: July 10, 2022, 03:43:25 am
content: The ultimate mechanical clock .......https://longnow.org/clock/And some others that are just too weird!

author: RJSV
author_rank: Super Contributor
timestamp: July 10, 2022, 06:01:10 am
content: I purchased the Laurie Penman book, Practical Escapements. Nice study !
max785cai datasheet ??? - Page 1
Forum section: electronics / general

author: kripton2035
author_rank: Super Contributor
timestamp: July 09, 2022, 05:28:12 pm
content: Hi everyone,I came upon a max785 ic on an old laptop power board (last century...90's )there is a max785 on it, just for curiosity I googled it and found NO datasheet for it !?it seems to be a power controller icwould like to know if it is kind of useful to keep or not.thanks.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 09, 2022, 06:32:20 pm
content: You probably found out it was an obsolete part, and could be bought from some brokers.Even Digikey lists it:https://www.digikey.fr/en/products/detail/rochester-electronics-llc/MAX785CAI-T/12599329(sold by Rochester Electronics.)It's not listed on Maxim's site anymore, but one can find the MAX786:https://www.maximintegrated.com/en/products/power/switching-regulators/MAX786.htmlWhich I'd assume would be somewhat similar.
Long, long, ago - Page 1
Forum section: electronics / general

author: artag
author_rank: Super Contributor
timestamp: July 04, 2022, 08:39:37 pm
content: in a galaxy far, far away,and populated by the likes (oops, nearly typed 'lies') of Practical Electronics and Elektorthere was a timing device that was used when the 555 couldn't go slow enough.It was an oscillator and a multistage counter and a bit of logic. And it wasn't a CD 4060 though it was a bit like that.Does anyone remember what it was called ? Could have been a Ferranti part (Z something. maybe.)

author: iMo
author_rank: Super Contributor
timestamp: July 04, 2022, 08:54:50 pm
content: ZN1034 ??

author: Benta
author_rank: Super Contributor
timestamp: July 04, 2022, 09:01:30 pm
content: MC14541?

author: Ian.M
author_rank: Super Contributor
timestamp: July 04, 2022, 09:25:45 pm
content: XR-2240/uA2240/LM2240 Programmable Counter Timer?https://www.eevblog.com/forum/projects/ltspice-simulation-madness-xr-2240ua2240lm2240-programmable-counter-timer/

author: eugene
author_rank: Frequent Contributor
timestamp: July 04, 2022, 09:41:00 pm
content: TMS1000?

author: Benta
author_rank: Super Contributor
timestamp: July 04, 2022, 10:06:13 pm
content: Quote from: eugene on July 04, 2022, 09:41:00 pmIsn't that a mask-programmed microcontroller?

author: artag
author_rank: Super Contributor
timestamp: July 04, 2022, 10:32:27 pm
content: Yeah, it was ZN1034, thanks. The others could be useful too.

author: Benta
author_rank: Super Contributor
timestamp: July 04, 2022, 10:42:22 pm
content: Apart from MC14541, the others are obsolete.

author: eugene
author_rank: Frequent Contributor
timestamp: July 05, 2022, 01:29:05 am
content: Quote from: Benta on July 04, 2022, 10:06:13 pmYeah. I was reaching a little, thinking that even as primitive as it was, it could probably be programmed to output square waves or pulses with a comparatively long period. The fact that it was mask programmable would make it a challenge to actually use.

author: jonpaul
author_rank: Super Contributor
timestamp: July 09, 2022, 11:44:54 am
content: First transistors CK722 PNP Geranium.....Raytheon ?think I bought one for $20 perhaps 1957?https://en.m.wikipedia.org/wiki/CK722Jon
Which is the best group for questions about communication protocols? - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: July 09, 2022, 08:01:17 am
content: For example, NMEA2000 used on boats for sensors and control messages.Whilst relevant to microcontrollers it's not specific to microcontrollers.The posts in the Projects, designs and technical group are mostly about hardware.It doesn't seem a good fit for the computers/programming group.

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 09, 2022, 11:33:44 am
content: I would say Microcontrollers. What I have seen in it, it is not just about microcontrollers, but also communication between them and peripherals.
Super Man - Page 1
Forum section: electronics / general

author: Peter Taylor
author_rank: Regular Contributor
timestamp: July 05, 2022, 06:47:04 pm
content: I went down to the local phone box and when I got inside, I turned into Super Man.When I got back home and told my brother, he didn't believe me."Well, next time it happens, I'll take a video".Of course, my mobile wasn't working and I didn't have it with me.I think I'll take up crochet knitting.

author: Gyro
author_rank: Super Contributor
timestamp: July 05, 2022, 06:54:26 pm
content: You make no sense.

author: ataradov
author_rank: Super Contributor
timestamp: July 05, 2022, 06:59:29 pm
content: It is a bot. Or someone thinks they are funny, but in reality they are just sad.

author: Benta
author_rank: Super Contributor
timestamp: July 05, 2022, 07:17:06 pm
content: Quote from: ataradov on July 05, 2022, 06:59:29 pmI'll support the second option, seeing what else has been posted under that user name.I thought LSD was a 60s/70s thing, but apparently not.

author: ataradov
author_rank: Super Contributor
timestamp: July 05, 2022, 07:22:13 pm
content: It is a bot ran by a person. They generate this nonsense and then respond on their own, sometimes throwing in another bot reply. Somebody has too much time on their hands.

author: Benta
author_rank: Super Contributor
timestamp: July 05, 2022, 07:33:44 pm
content: Whatever. It's annoying and I've reported it. Hopefully we'll soon be rid of this pest.Cheers.

author: ebastler
author_rank: Super Contributor
timestamp: July 05, 2022, 08:51:33 pm
content: Posting under the influence, is my theory.Should result in a revoked license. I have suggested that to the mods too.

author: Zero999
author_rank: Super Contributor
timestamp: July 05, 2022, 08:55:52 pm
content: Quote from: Peter Taylor on July 05, 2022, 06:47:04 pmLet me guess he then invented perpetual motion, run off fart gas of course.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 05, 2022, 08:58:19 pm
content: Quote from: Peter Taylor on July 05, 2022, 06:47:04 pmNot sure your brother will believe that either.

author: Nominal Animal
author_rank: Super Contributor
timestamp: July 05, 2022, 10:34:37 pm
content: I went into the local sandwich shop, and turned into Sub Man.Now I can't go out because everyone wants to beat me up.

author: eugene
author_rank: Frequent Contributor
timestamp: July 05, 2022, 11:11:56 pm
content: Quote from: ebastler on July 05, 2022, 08:51:33 pmI've never inhaled, but I have a friend that does sometimes, and he sounds a lot like this guy when he's stoned.

author: themadhippy
author_rank: Super Contributor
timestamp: July 05, 2022, 11:27:30 pm
content: QuoteWhat did your big sister say?https://youtu.be/ITuRemn3naI

author: Halcyon
author_rank: Unknown
timestamp: July 07, 2022, 03:57:10 am
content: Cool story but still pointless bollocks.
Any Electronics Hobbyists around Abu Dhabi or Dubai? - Page 1
Forum section: electronics / general

author: M.Zohaib Usman
author_rank: Unknown
timestamp: July 07, 2022, 08:40:20 pm
content: Hey everyone!I was in Abu Dhabi and Dubai for a short period of time and was wondering if there are any communities or people around here that wanna hang out and show me around their workspace and have basic chit chat related to this stuff.Just send me a PM if you're down or text me on instagram @antynomous.Can't wait to meet up.Thanks!
Jaycar new store Box Hill South, Melb AU - Page 1
Forum section: electronics / general

author: gbaddeley
author_rank: Regular Contributor
timestamp: July 10, 2022, 06:21:02 am
content: Went for my Officeworks fix today & noticed Jaycar have opened a new store at 295 Middleborough Rd, Box Hill South. Full range of parts on shelves & semis over the counter. No more packing a cut lunch to go to Springvale!
Red Chinese 20 Amp variac overload at 4 volt and 40 volt when turning dial fast - Page 1
Forum section: electronics / general

author: robsims
author_rank: Frequent Contributor
timestamp: July 03, 2022, 02:54:51 pm
content: Hi,I have a red Chinese 20 Amp max Variac. When i turn the dial fast in clockwise direction my multimeter shows OL at 4 volts and at 40 volts. When i turn the dial very slow i don't get the Ol message on my multimeter. When i turn the dial counter clockwise i don't get any OL message on my multimeter. Anyone know what the problem might be?

author: TMM
author_rank: Frequent Contributor
timestamp: July 03, 2022, 03:00:42 pm
content: I assume your multimeter is 4000 or 40000 counts? The multimeter shows "OL" (over-limit) briefly when the value reaches the limit of the range and it has to change up to the next range. This is normal. When you turn the variac slower it can probably change to the next range before the reading reaches the over-limit, therefore doesn't need to display "OL".

author: robsims
author_rank: Frequent Contributor
timestamp: July 03, 2022, 03:15:48 pm
content: Many many many thanks TMM. Yes the multimeter shows OL briefly. I have two Extech MN16A multimeters and indeed they are 4000 counts. Problem solved. Thanks again
Open Source Oscilloscope Graphics: Osci-Render - Page 1
Forum section: electronics / general

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 27, 2022, 02:36:44 pm
content: Hi all - new to the forum and a quick search didn't reveal any prior posts about this, so I figured I'd toss it out there for anyone else interested in XY scope visualization... Osci-Render is a cross platform open source software project that provides in depth control of scope vector graphics including the ability to import 3D object files created by various CAD programs. The program uses your computer soundcard to generate signals that can be displayed on a scope. There is also some kind of "virtual oscilloscope" webpage that I imagine is supposed to display the graphics but I think my adblocker or firewall is preventing proper operation, so YMMV on the virtual scope... BUT real scopes work as expected.As a vector graphics nerd this is among the best apps I've discovered for this kind of thing. I have no affiliation with the project.Enjoy!https://github.com/jameshball/osci-render" alt="" class="bbc_img" />

author: jameshball
author_rank: Newbie
timestamp: July 02, 2022, 11:49:29 am
content: Hi! I'm James the developer of osci-render - made an account to reply to thisThanks for the kind words and I'm glad you're making good use of it! I wanted to reply to try and work out why you're having issues with the browser-based software oscilloscope. First thing I'd check is that if you're on Mac OS, try using Google Chrome or Firefox instead of Safari as I've seen people have issues with that in the past. I should add a disclaimer to the website for this!If that's not the issue it would be great if you could give some more details so I can try and get this fixedThanks!
[Solved] Whats that thing? - Page 1
Forum section: electronics / general

author: dredd
author_rank: Contributor
timestamp: July 02, 2022, 03:01:14 am
content: Hi.I bought Stedi LED driving lights,https://www.stedi.com.au/stedi-7-inch-carbon-charcoal-led-headlight.htmlIt comes with the harness, relay and taps into one high beam light circuit. So logic is - LED lights mimics high beam, but no light if cabin switch is off.But what is the device they used in harness? I made hand diagram too.

author: themadhippy
author_rank: Super Contributor
timestamp: July 02, 2022, 03:07:02 am
content: Quotewhich device, the switch in picture 1,the connector in 2 or the bridge rectifier in 3?

author: dredd
author_rank: Contributor
timestamp: July 02, 2022, 03:07:47 am
content: The bridge rectifier, lol thanks!

author: dredd
author_rank: Contributor
timestamp: July 02, 2022, 03:11:41 am
content: It was all shrouded in heat shrink and I was getting mad drawing the diagram - the high beam tap wires did not buzz at all to any other wire!!
4D Crystals (yes, they do actually exist) - Page 1
Forum section: electronics / general

author: DiTBho
author_rank: Super Contributor
timestamp: June 27, 2022, 10:45:53 pm
content: Will be used in quantum computers? ProbablyYesWait ... What? Why? How? ....Well, in her last YouTube video,Physics Girltries to answer some questions:

author: PlainName
author_rank: Super Contributor
timestamp: June 30, 2022, 03:49:49 pm
content: So you have this stuff and it changes back and forth when you feed it some energy? Sounds a bit like a crystal.

author: tszaboo
author_rank: Super Contributor
timestamp: June 30, 2022, 04:40:12 pm
content: When she was first describing time crystals, I was saying: "sure, I have them in almost every device I make, and buy them at digikey"I'm still not sure why it is important, sounds like it changes spin every time you shoot laser at it? Not sure what gives it the time property. I dont think it can even be used for timing purposes, it sounds to me more like a counter.

author: TimFox
author_rank: Super Contributor
timestamp: June 30, 2022, 05:50:50 pm
content: Isaac Asimov, as usual, was way in advance of his time.He described "thiotimoline", a molecule with interesting temporal properties, in several spoof scientific articles and used it in some SF stories.https://gizmodo.com/the-fake-chemical-compound-isaac-asimov-invented-to-pun-5887014

author: AndyBeez
author_rank: Frequent Contributor
timestamp: June 30, 2022, 08:13:59 pm
content: Define the fourth dimension. Is it time or just the next higher geometric level? The fourth dimensional cube in 3D spacehttps://en.m.wikipedia.org/wiki/Tesseract
ORNL declares no proof of parallel universe, yet.... - Page 1
Forum section: electronics / general

author: mclute0
author_rank: Regular Contributor
timestamp: June 30, 2022, 06:42:10 pm
content: and here I was, so sure that some people are living in an alternate universe; but absence of proof is not proof of absence.https://www.ornl.gov/news/physicists-confront-neutron-lifetime-puzzle
Does hot water freeze faster than cold? - Page 1
Forum section: electronics / general

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: June 29, 2022, 08:04:51 pm
content: I had not heard of this before, it's called the Mpemba effect.https://www.quantamagazine.org/does-hot-water-freeze-faster-than-cold-physicists-keep-asking-20220629/My theory is that the hot water will set up convection currents when chilled, causing mixing and preventing stratification. Could be tested experimentally by trying this in zero g, where convection is eliminated.

author: bdunham7
author_rank: Super Contributor
timestamp: June 29, 2022, 08:12:37 pm
content: Discussed previously. Maybe, but probably not.https://www.eevblog.com/forum/chat/freezing-speed-of-hot-versus-cold-water/

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: June 29, 2022, 08:16:36 pm
content: Sorry, I missed that thread. Mods could close this thread.

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 29, 2022, 08:51:56 pm
content: Get two equal glasses.Fill one with boiling water, the other with colder tap water.Put them in the freezer.Time which one freezes first.The question will be answered once and for all time.
Reach out and touch someone - Internet touching - Page 1
Forum section: electronics / general

author: xrunner
author_rank: Super Contributor
timestamp: June 29, 2022, 12:51:40 pm
content: Remember the old Rocky Horror Picture Show song "Touch-A-Touch-A-Touch-A-Touch Me" ?Well that experience is coming to the internet. Wonder if it would improve the forum experience here?Quote
1971's Smallest Battery-Powered Calculator: Dictaphone 1680 - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 24, 2022, 10:25:12 pm
content: Cool video on a vintage calculator from 1971 by LGR.

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 27, 2022, 03:28:35 pm
content: Only 5 years later Casio had got them down to the size of a matchbook...I remember my dad bringing home a TI 4 banger around '72 or '73... It was miraculous!
Swimming Pool light stray voltage? - Page 1
Forum section: electronics / general

author: sk614
author_rank: Contributor
timestamp: June 26, 2022, 06:42:22 am
content: I recently decided to do a pool light replacement to LED (we just moved in). The pool light is 12vac from a step down transformer. During the repair I shut off the main pool breaker, disconnect the 12VAC output wiring from 120vac pool transformer and shut off local pool light transformer breaker. However when I removed the pool light under the water I feel a tingling/shock in the area of the pool light. Putting my hand further away no sensation. Using a DMM I measured ~3Vac at that light niche area at 60Hz. I went to shut off house main breaker and even doing so I still feel tingling/shock around original light fixture. As for now the pool is under quarantine until I can get a technician out.

author: Gregg
author_rank: Super Contributor
timestamp: June 26, 2022, 09:12:51 pm
content: Make sure you have a really good ground to neutral connection at the main service entrance; only one ground to neutral ground connection. If you have sub panels, check that they do not have the bonding screw installed.You seen to be getting some potential feedback on the neutral if turning off the main still shows voltage. This may even be from a neighbor with a poor ground connection.Consider multiple ground rods connected together and then to the main neutral ground bond. Also you can ground one of the low voltage transformer leads to a separate ground near the pool if the transformer is totally isolated at the low output.
Part on aircon control board - Page 1
Forum section: electronics / general

author: Engineer1
author_rank: Contributor
timestamp: June 26, 2022, 01:06:17 pm
content: Hi,I think it's a surge suppressor, or arc quencher. But, I've not seen this type before...Thank you for reading

author: floobydust
author_rank: Super Contributor
timestamp: June 26, 2022, 07:29:36 pm
content: It looks like a small gas-discharge tube, Japanese make. I've only seen them in car radios at the antenna input and some multimeters. Never found the actual manufacturer or datasheets for it.Is it across the compressor motor? It's too small for mains use.
Another ground breaking, earth shattering philosophical random statement. - Page 1
Forum section: electronics / general

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 25, 2022, 07:03:40 am
content: A new definition of our number line.In classic education, our number line is defined as a line that extends infinitely from minus infinity to plus infinity.Within this line, a section is divided infinitely, to give another number line that extends infinitely from minus infinity to plus infinity.Within this line, a section is further divided infinitely, to give another number line that extends infinitely from minus infinity to plus infinity, and so on.This serves no purpose except to define nothing with nothing.A number line should only represent integer values, since values that have no exact value, such as root two or pi, can only ever be given an approximate value represented by integer numbers.

author: ataradov
author_rank: Super Contributor
timestamp: June 25, 2022, 07:43:42 am
content: We get it, you've got access to GPT-3. Funny. You can go away now.

author: voltsandjolts
author_rank: Unknown
timestamp: June 25, 2022, 09:07:07 am
content: Thanks to ataradov's reply I actually learned something interesting from this utterly pointless thread (which should be deleted).I'd never heard ofGPT-3.

author: magic
author_rank: Super Contributor
timestamp: June 26, 2022, 07:40:22 am
content: Quote from: ataradov on June 25, 2022, 07:43:42 amI'm not convinced that GPT-3 would get far in mathematics.BTW, to all the others who also didn't get the point, OP is basically ranting that irrational numbers are too hard for himThe solution, of course, is to learn maths.

author: eugene
author_rank: Frequent Contributor
timestamp: June 26, 2022, 05:54:11 pm
content: Yes, and as seems to be his style when he doesn't understand something, instead of saying "help me understand" he says "this is bullshit and wrong. I must be a genius because I'm the first person to notice that it's wrong."Pretty much impossible to have a meaningful dialog with a person like that. There's another regular poster that I won't name, but he's convinced he's discovered the truth behind electrical conductivity where every single person up to now, even genuinely brilliant scientists that devoted their entire adult life to the subject, have all gotten it wrong until him.

author: Simon
author_rank: Unknown
timestamp: June 26, 2022, 06:32:16 pm
content: Oh another one of these wastes of time!