hybridfree/eevblog-posts huggingface dataset:
Magnetic compass digital sensor - Page 1
Forum section: electronics / projects

author: embedded.world@aol.com
author_rank: Contributor
timestamp: April 02, 2014, 09:49:28 am
content: I am looking magnetic digital compass sensor.I have to show magnetic compass on LCD, north & in direction user is moving.I was looking at HMC6352. Datasheet is attached1. Page 7 of datasheet shows "Heading Mode". This is the angle.For example data shows 10degree. Does that means 10 degree from north?2. The package is in LLC. Does anyone digital sensor in more easily solderable package by hand.3.It has one pin at the edge bending 90degree. What its purpose

author: Rerouter
author_rank: Super Contributor
timestamp: April 04, 2014, 08:50:57 am
content: Short of the user pointing the device in the direction they are heading you wont be able to track the direction of there movement with only a magnetometer,another thing to be aware of is the heading will change as you tilt it unless you correct it with an accelerometer (yes gets more complex doesn't it)The pin in the corner is an indicator of pin 1, so you get it rotated correctly when mounting
Magnetic Flux - what is an "equivalent plane"? - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: April 05, 2024, 07:24:36 am
content: I'm reading about the Biot-Savart law WRT magnetic field and flux calculations. In some treatments, there is a concept called an "equivalent plane".I don't really understand the diagrams for this: what is an "equivalent plane" in this context and why/how is this idea useful?One example is here "Figure 6 shows the equivalent plane diagram of the coil and the track"https://www.researchgate.net/publication/321688638_Combination_of_Compensations_and_Multi-Parameter_Coil_for_Efficiency_Optimization_of_Inductive_Power_Transfer_System#pf6

author: mag_therm
author_rank: Frequent Contributor
timestamp: April 05, 2024, 08:35:03 pm
content: I think it is as follows:In real coil packs, the conductors have a finite thickness (down into the plane of Fig 5, and horizontally, in Fig 6)In Biot and Ampere's laws, wire can be assumed to beinfinitely thin so that the B at a distant point from the contributions of wire lengths dl along the wire length can be solved analytically as a simple first approximation.So Fig 6 is being solved analytically for (Bx,y) as if the coil packs are infinitely thin, lying in the vertical plane shown in Fig 6 ( along the blue vertical axis) Fig 6 has rotated Fig 5 by 90 degrees.They call the vertical blue line "equivalent plane" of the coil packs.Then they get (9) and (10) contributions analytically using 8In a 2D or more accurate 3D FEM, the real thickness of the packs would be drawn, and the numerical solvers would consider the J in elements inside the copper conductors across the thickness.Back in early 20th C they were solving jobs like Fig 5 and including the finite thickness, analytically with slide rules, log tables and adders.Eg Dwight H B "Coils and Conductors" 1945

author: MarkT
author_rank: Frequent Contributor
timestamp: April 06, 2024, 08:38:38 pm
content: Quote from: 741 on April 05, 2024, 07:24:36 amI think its just the words "equivalent" and "plane diagram" used in conjuction, not a notion of "equivalent plane"
Magnetic Levitation & Wireless Power , Spinning LEDs in mid air  - Page 1
Forum section: electronics / projects

author: Schottky
author_rank: Regular Contributor
timestamp: November 30, 2013, 01:31:44 am
content: Hi everyone,I'd like to share with you my latest project combining magnetic levitation and wireless power.An electromagnet levitates a ring of LEDs attached to a coil. The LEDs are powered using a wireless power transfer from another coil under the electromagnet.Levitation is achieved using a Hall effect sensor and a proportional controller implemented on a KA7500 SMPS controller. The wireless power transfer system consists a Class E DC/AC inverter operating at 800 KHz.The LEDs can be rotated to give a very nice visual effect which is shown at the end of the videoSeveral other videos about combining magnetic levitation and wireless power can be found on youtube.

author: TerraHertz
author_rank: Super Contributor
timestamp: November 30, 2013, 02:02:45 am
content: Nice. But... why not make the levitation field coil a three-phase array, producing a controlled frequency rotating field, with the levitation feedback via overall field strength? Then you can levitate the object AND spin it invisibly. You could also provide power to the levitated object by a higher frequency modulation of the same field (via separate coil, if easiest.)It seems to be an obvious 'next step' nobody I've ever seen takes. Has anyone?For instanceI wish someone would do it. It's one of those projects I want to do, but know I'm never going to get time to do myself.The rotational component of the field doesn't have to fully invert as in a generator or motor, just include variations in the amplitude. Any conductive disk in the levitated object will then have induced eddy currents proportional to the varying field, that will drag it around following the external field rotation. Does not have to be much force, since there's no friction.
Magnetic media and perpendicular recording in floppies - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 17, 2024, 04:07:31 pm
content: This is more of a wool-gathering question/post.Since people have assured me that some floppy HD media can be used in a ED drive, I wonder about how it works. I didn't think it would work. Indeed most of the time it doesn't. But in some cases it does!If a HD disk has a thicker coating could the return flux just be in the HD coating, and because the lines are spread out as they go back to the larger part of the head, it would leave the domains alone?And if so, why did ED media have a second layer? Did it? Or is it just something I read somewhere?And if so, why was magnetic recording longitudinal for so long? Seems even analog audio could have done this in the '60s?Seems like a perpendicular recording head doesn't require an accurate tiny gap, but just depends on the sharpness of the point? And a sharp edge is a lot easier to make than an accurate gap. Think stick vs piston engine.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 18, 2024, 02:32:30 am
content: I think I found an answer. There's two types of perpendicular recording. Like, duh, I guess. Type 1 is with a soft return layer, type 2, without.https://www.cse.psu.edu/~buu1/teaching/spring07/598d/_assoc/994BCFA15D6146A9A7C08EF5683E1A42/TheFutureOfMagneticStorage.pdfpg 8"(a) Longitudinal magnetic recording. (b) Type 1 perpendicular recording, using a probe head and a soft underlayer in the medium. (c) Type 2perpendicular recording, using a ring head and no soft underlayer."Of course now the question is why they draw a longitudinal-style head.
Magnetic Power Connector  - Page 1
Forum section: electronics / projects

author: Kedar264
author_rank: Regular Contributor
timestamp: May 08, 2015, 10:57:38 am
content: Opposite magnet poles attract each other , can we use this force to make connector ,let's give a tryhere is my buildhttps://youtu.be/I8ntUVj-sqMO0What do you think?

author: FreddyVictor
author_rank: Regular Contributor
timestamp: May 08, 2015, 03:20:56 pm
content: nice idea but already invented I thinkhere

author: that_guy
author_rank: Contributor
timestamp: May 08, 2015, 03:44:02 pm
content: Done andpatented by Apple, a company not known for reigning in the lawyers when litigation is an option.

author: technix
author_rank: Super Contributor
timestamp: May 08, 2015, 04:07:49 pm
content: Quote from: Kedar264 on May 08, 2015, 10:57:38 amSound like MagSafe by Apple. I have a MacBook Pro so I use this kind of connector everyday. Too bad buddy Apple patented it, and is using it actively in every MacBook ever produced since its introduction, and now Apple Watch too.

author: Fraser
author_rank: Super Contributor
timestamp: May 08, 2015, 05:04:56 pm
content: I have used the ones available from Rapid for years. I have used them on my Ni-MH charger cables when connecting to the ends of an untagged cell. They work very well.Aurora
Magnetic Pulse Generator  - Page 1
Forum section: electronics / projects

author: Forrrest1
author_rank: Newbie
timestamp: May 04, 2025, 01:12:57 pm
content: Hi All, I'm new to the forum, based in the UK, and I'm looking for someone to build, or advise who I should speak with to build, a Bob Beck magnetic pulse generator. I realise there are already some products on the market, but I would like the specifications to be exactly the same strength of back emf that Bob designed it to perform.If someone can help or point me in the right direction to get this project off the ground then it would be greatly appreciated. I've attached the handbook with all the specs/details on how to build.Kind regards, Pete

author: langwadt
author_rank: Super Contributor
timestamp: May 04, 2025, 01:56:27 pm
content: shouldn't this be moved tohttps://www.eevblog.com/forum/dodgy-technology/

author: Andy Watson
author_rank: Super Contributor
timestamp: May 04, 2025, 01:58:34 pm
content: Quote from: langwadt on May 04, 2025, 01:56:27 pmDefinitely YES!

author: PascalNE
author_rank: Regular Contributor
timestamp: May 04, 2025, 02:12:39 pm
content: If you are suffering from any serious health issueplease go to a doctorand don't build this. It will not work

author: radiolistener
author_rank: Super Contributor
timestamp: May 04, 2025, 04:02:50 pm
content: I'm not sure, what is "Bob Beck magnetic pulse generator"? Is it kitchen induction hob?My induction hob is "Gorenje", but it seems that they all have similar circuit.

author: Benta
author_rank: Super Contributor
timestamp: May 04, 2025, 07:15:14 pm
content: There's one born every minute.

author: SteveThackery
author_rank: Super Contributor
timestamp: May 04, 2025, 09:04:09 pm
content: Never heard of it. Just now read about it. Pseudo-science.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 04, 2025, 11:15:05 pm
content: Well well, a 'Blood Electrification Unit'Probably an adjunct tobleach injections...or perhaps a detrimential/harmful combination ofElectrophoresisandIontophoresis.And for those that keep reluctant, a few 'Brain Tuner'(*) sessions is for sure beneficial.(*) also described in this same reference^^ book

author: Poroit
author_rank: Frequent Contributor
timestamp: May 05, 2025, 06:21:45 am
content: G'day Forrest1,I used to sell Conductivity Meters to an old guy who was making Colloidal Silver Solutions.He loved a chat and still needed his walking stick when I last saw him.Seriously mate...you will get more benefit from a walk around the block and a glass of red wine.Read the Warnings/disclaimers on the attached.https://www.wizardpharmacy.com.au/other/suttons-collodial-silver-500ml?srsltid=AfmBOopgoJtKYKkpkmT_mQ8VZayLY38BGKl3MNAi17X0g5gxlgdsUKzV

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: May 05, 2025, 11:07:24 am
content: Not two pages in, and they tell you to ingest colloidal silver. ITS POISONOUS!
Magnetic standoffs - Page 1
Forum section: electronics / projects

author: Messtechniker
author_rank: Frequent Contributor
timestamp: December 20, 2016, 06:09:54 pm
content: Probably not an entirely new idea, but even so quiteuseful - my home made magnetic standoffs.See pics.You need:4 rubber feet1 sheet metal panel cut according to the size you need. Cut from the side panel of a big tower housing, for example.4 countersunk magnets4 M3x20 or so countersunk bolts4 15 mm or so plastic spacers4 M3 nutsThe benefit: When attaching test clips, the circuit board willno longer move around potentially creating shorts.Suited for circuit boards of differing sizes.Have funYours Messtechniker

author: ajb
author_rank: Super Contributor
timestamp: December 20, 2016, 06:16:58 pm
content: Well, I'm certainly a fan of the idea!https://www.eevblog.com/forum/projects/a-super-simple-pcbite-ish-pcb-holder/
Magnetic switch inside a dive light - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: October 25, 2020, 02:10:50 pm
content: Has anyone pulled apart a reasonably modern waterproof dive light to reveal the switch mechanism?Some have a rotary control that wraps around the body like the focus ring on a camera lens, other have a rotary control perpendicular to the body.Is it a reed switch (or series of switches) or a magnetic sensor IC or something else?

author: geggi1
author_rank: Frequent Contributor
timestamp: October 25, 2020, 02:19:12 pm
content: most likely is it a Reed switch with a transistor or relay driver.https://www.pickeringrelay.com/what-is-reed-relay/

author: free_electron
author_rank: Super Contributor
timestamp: October 25, 2020, 03:31:54 pm
content: All the light & motion lights use hall sensors Allegro 3 pin sot23

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 25, 2020, 07:55:13 pm
content: I happened to have a HALL sensor stuck in a breadboard in front of me, so I put a DMM in it's power supply.It constantly sucks over 3mA from the power supply, which is not a very good thing for a battery operated gadget. REED switches do not need any power to preserve their state.

author: free_electron
author_rank: Super Contributor
timestamp: October 25, 2020, 08:57:54 pm
content: light and motion uses a very low power mcu ( gecko) and they pulse the power of the hall sensor a few times per second for a few microseconds.

author: drvtech
author_rank: Regular Contributor
timestamp: October 25, 2020, 11:41:20 pm
content: Quote from: Doctorandus_P on October 25, 2020, 07:55:13 pmYou can get MUCH lower power Hall effect switches. Look up DRV5032. Less than 1uA under certain conditions.
Magnetic tool holder in a electronics lab? - Page 1
Forum section: electronics / projects

author: george graves
author_rank: Super Contributor
timestamp: June 19, 2013, 02:59:13 am
content: What's the potential problems with a magnetic tool holder in a home electronics labwithoutCTR scopes?I'm thinking of adding some of the front of the shelves - not far from other test equipment and test leads, but arms reach from the center of my work area.I assume that the magnetic field could mess with CRT scopes - but I what about other things? What about test leads?

author: vk6zgo
author_rank: Super Contributor
timestamp: June 19, 2013, 07:43:07 am
content: Very unlikely to worry a CRO,they are well shielded.The main thing which we used to worry about were Colour TV,& Computer monitor CRTs,where there was the possibility of causing colour purity errors.You also may end up magnetising your screwdrivers,etc,which can be useful,or can be a major pain in the neck!Good Test leads & probes are made of copper & brass respectively,so unless you have some real ELCheapo probes,you should be OK.

author: richard.cs
author_rank: Super Contributor
timestamp: June 19, 2013, 08:39:55 am
content: I don't see a particular problem with it. If you get it too close to a CRT scope you'll put the beam off center and the problem will go away as soon as you move it. It's nothing like the colour CRTs used in TVs where it's possible to magnetise the shadow mask and screw up the colours.

author: amyk
author_rank: Super Contributor
timestamp: June 19, 2013, 11:10:59 am
content: As mentioned inanother thread, magnetic field obeys inverse-square law so the field strength drops off rapidly with the distance. Here it's an advantage as things like moving test leads around won't induce great voltages in them. Maybe still not a good idea if you are working withverytiny signals...
magnetic variable shunt for meter gain adjustment ? cool design  - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: May 24, 2022, 03:52:11 pm
content: see this video, it explain my finding in a new teardown videohttps://youtu.be/-PKwTooJld8the meter is from 1963 , see the comments too
Magnetics for 1GbE. How to select? - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: September 04, 2024, 08:42:19 am
content: Hi,I had a custom board designed with an 1GbE ethernet chip . Now that chip has gone obsolete and I am attempting to replace it with 88E1518 from Marwell.In the earlier custom board used magnetics in Connector (HFJ11-1G01ERL)https://www.mouser.in/datasheet/2/706/fastjack_gigabit-520265.pdfNow how to know about suitable magnetics for 88E1518. Will the above be compatible? How would one arrive at a suitable magnetics for ethernet PHY??

author: Rafiki
author_rank: Contributor
timestamp: September 04, 2024, 11:07:06 am
content: Usually every PHY manufacturer does have some application note how to select proper magnetics or hints about in the datasheet. Marvell sometimes calls this white papers. You already read the AppNote for Alaska PHYs?You can also choice the same as the manufacturer use on its application board. The selected one isn't taken by accident there (usually).

author: rakeshm55
author_rank: Regular Contributor
timestamp: September 05, 2024, 04:22:09 am
content: I am attaching the schematics of application board.Here Marvell uses1. H5007 for independent magnetics and2. 0826-1G1T-43-F for magnetics in connectorConsidering 0826-1G1T-43-F with common mode filter at MDI - PHY side, a suitable Transformer will be Circuit B (Part No HFJ11-1G06ERL ) rather than (HFJ11-1G01ERL) inhttps://www.mouser.in/datasheet/2/706/fastjack_gigabit-520265.pdfAm I correct??
Magneto spark output vs RPM - Page 1
Forum section: electronics / projects

author: Circlotron
author_rank: Super Contributor
timestamp: September 03, 2020, 02:18:47 pm
content: Conventional wisdom and internet lore has it that the faster a magneto is rotated on an engine, the greater the spark voltage and energy it produces because as everyone knows, a magneto is just a specialised generator.Thought about this for quite a while. I've come to the conclusion that up to a point a magneto output does depend on rpm, but not for a same reason a generator does. In a traditional magneto a small percentage of the winding is short circuited by a set of contacts, and when the rotating magnets on the flywheel are aligned with the magneto coil pole pieces the contacts open circuit and a high voltage is produced by this coil. So far, so good.When the points are closed and the magnet comes into position, it tries to put magnetic flux through the coil pole piece but the short circuited coil has a current induced into it that creates a magnetic field in the pole piece that opposes the rotating magnet's flux. If the short circuited portion of the coil had superconducting wire with zero resistance, the rotating magnet could be positioned stationary next to the pole piece and it's flux would never be able to enter the pole piece. And in fact, if the short was then removed a single high voltage pulse would be produced despite the magnet being stationary.Because the short circuited portion of the coil has a small value of resistance, the result is the magnet's flux will gradually creep in to the pole piece even though the coil is shorted. The longer this is allowed to happen before the contacts open and the short circuit is removed, the less flux change is available to generate a high voltage.What I am suggesting is that above a certain rpm a magneto will produce a more or less constant output voltage into an open circuit, not increasing indefinitely with rpm, and as rpm drops the output voltage decreases because of less available change in flux when the contacts open, not because of slower rate of change of flux as in a conventional generator.Comments invited.
Magnetometer Calibration  - Page 1
Forum section: electronics / projects

author: YTusername
author_rank: Regular Contributor
timestamp: January 19, 2024, 11:06:50 am
content: I have been involved in a project that requires direction with tilt compensation (azimuth). I have good experience with magnetometer calibration, both Soft- and Hard-Iron, as outlined in atutorialI wrote. Among the few public and open-source tools available for calibration, MotionCal by Paul Stoffregen stands out for its high accuracy. However, this tool is PC-based, and I have implemented a hack to make it work over BLE, as detailed in thisarticle.I was searching for a solution to perform calibration on a mobile device while sending the magnetometer data over BLE to the phone. Initially, I assumed that Android provides APIs to report back the calibration matrix, but to my surprise, I found that it is closed source. The same applies to iPhone. MotionCal and other tools I've used or come across demand very clean data and require the device under calibration to move in all directions. In MotionCal, it can take up to 2 minutes to collect such healthy data. On the contrary, mobile phone calibration algorithms typically involve moving the device in an infinity shape for 5-10 seconds, and calibration is often done in the background.My initial plan was to port MotionCal to Flutter, but I realized that asking the user to move the device in all directions for 2-3 minutes is not user-friendly.My question is, does anyone know of a tool that can perform calibration as quickly as the methods used in mobile phones? The tool can be either free or licensed. I know that such libraries should be there, but still searching for one and better to have a recommendation form the forum.Note: The used magnetometer in my project is a normal one without a fancy software engine inside for sensors fusion. Unfortuntly, the Hardware can not be changed.
Magnetometers like the TLV493D with programmable I2C addresses? - Page 1
Forum section: electronics / projects

author: DAbdi
author_rank: Newbie
timestamp: June 23, 2023, 01:40:53 pm
content: Hello, my project involves multiple magnetometers on the same I2C bus. Each daughterboard containing 1 sensor must be the same so unfortunately I can't adjust the PCB to add resistors on certain pins to change the I2C address (Like you can on the MLX90393). The TLV493D has a register that contains the I2C address and it can be changed just through code which is what I'm looking for. However, the positional accuracy of the TLV493D isn't exactly the best so I was hoping that an option that is better exists. Does anyone know of a chip that meets these requirements? Apologies in advance if this isn't the right place to post, please direct me to the correct place if this is the case.Thank you

author: Benta
author_rank: Super Contributor
timestamp: June 23, 2023, 02:00:29 pm
content: Without doing the search for you:Check Infineon and ST.
Magnetostrictive position sensor. Does anybody knows how it work? - Page 1
Forum section: electronics / projects

author: becoolnike
author_rank: Newbie
timestamp: June 28, 2017, 10:14:47 pm
content: I've being looking for information about how magnetostrictive technology works and I want to make a small demo but there is almost no information online about magnetostrictive technology.What i understand so far is that when a high voltage pulse is send into a ferrite material like nickel, and the pulse follows the path of the ferrite material until a magnet is placed near the ferrite, so it creates a change of shape or dimension of the ferretie material, resulting ultrasonic feedback that is measured using a coil.I tried an experiment before using my function generator and oscilloscope but I failed because i was not able to see anything or hear anything also my function generator cant generate high voltage pulse waves.anybody familiar with this technology?this is the only useful info i found about implementing this technology but it only talks about the inductor not about the whole implementation:http://www.mdpi.com/1424-8220/12/5/6395/htm]http://www.mdpi.com/1424-8220/12/5/6395/htm] http://www.mdpi.com/1424-8220/12/5/6395/htm

author: N2IXK
author_rank: Frequent Contributor
timestamp: June 29, 2017, 12:21:18 am
content: There is a .pdf and a video available here explaining these things:http://www.mtssensor.de/Magnetostriction.224.0.html?&L=0
Magnifier lamp mod to keep it folded - Page 1
Forum section: electronics / projects

author: nctnico
author_rank: Super Contributor
timestamp: August 30, 2013, 10:38:42 am
content: Just a quick hack I'm pretty fond of. I want to fold my magnifier lamp when its not in use to keep it from using too much space. The problem is the lamp keeps falling down and I got a sore throat from cursing when that happened. I thought of all kinds of latching contraptions but last week I got a better idea: use a magnet to hold the lamp. So I disassambled a random hard drive from my pile of hard drives to scavenge a magnet (the one used to position the heads) and stuck it onto the lamp housing using double sided tape (the strong stuff).
MAIDA REGULATOR (appnote, shematic and more) - Page 1
Forum section: electronics / projects

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 12:52:40 pm
content: HiI google a interesting appnote LB-47 from Texas Instrumentshttp://www.ti.com/lit/an/snoa648/snoa648.pdfThe autor name is Maida so this design is called as "Maida regulator"Is it good or bad?What about benefit?Anybody built it?What experienced EEs can say at all?Is it good idea to modify it with MOSFET?

author: TimFox
author_rank: Super Contributor
timestamp: October 03, 2019, 01:18:44 pm
content: I have used the MOSFET version, similar to the one shown here, for relatively high voltage (140 V output) with good success. The extra diodes shown for protection are very important.

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 01:54:45 pm
content: Is it possible to change LM317 with more common LM78XX?

author: MagicSmoker
author_rank: Super Contributor
timestamp: October 03, 2019, 02:13:19 pm
content: Quote from: 001 on October 03, 2019, 01:54:45 pmAre you kidding? The LM317 has been in common and prolific use for 40+ years. I built my first power supply with it back in the 80s! So, it should be just as available in Antartica as the LM78xx series.

author: floobydust
author_rank: Super Contributor
timestamp: October 03, 2019, 06:54:59 pm
content: "Maida regulator" is only 25mA output current. How much current do you want?Of the LM317-type HV reg IC's:SupertexLR8good to 450V but a little TO-92 or DPAK.TL783to around 125VDC but needs minimum 15mA load.ST VB408B 400V 50mA but hard to find.

author: 001
author_rank: Super Contributor
timestamp: October 03, 2019, 07:33:53 pm
content: Quote from: floobydust on October 03, 2019, 06:54:59 pmAt least 120mA will be okIs it possible to add pass transistor this way?
MAIN BOARD EPSON L1800 IN EPSON1430W - Page 1
Forum section: electronics / projects

author: quinoara
author_rank: Contributor
timestamp: June 20, 2018, 12:16:51 am
content: As I can identify the versions of this model, it seems that there is an American and another Australian. Download the service manual that abounds in the network for the following models: Stylus Photo 1400/1410 / Stylus Photo 1430W / 1500W /Artisan 1430. They coincide in the mechanical part, but with the main board no.I clarify the SISCON presents a different reference, its different location number, the CN4 connector that brings the printer that I have in the manual appears as CN5. Pin 8 of the same connector in the printer does not go; in the manual goes to 3.3v.In the manual the board is referenced as CA53MAIN, in the printer it is as CB53MAIN.Replace the board with the L1800 with reference C53MAIN identica physically, in other forums have made this modification, but I need to identify the pine of CN4 that in the L1800 is smaller than in the 1430w and I need to make adaptation.In the manual of the L1800 there is no electrical diagram.In the electrical diagram of the 1430w according to version does not match the board of the machine.Any ideas?

author: ElektroQuark
author_rank: Unknown
timestamp: June 20, 2018, 05:14:40 am
content: You have post this test three times now. Identical test. If there are no answers this won't help you.BTW, the first time you posted this I asked you a question. No response was given.

author: quinoara
author_rank: Contributor
timestamp: June 22, 2018, 12:36:36 am
content: Excuse my English is very poor, and I could not find the first post you post

author: Simon
author_rank: Unknown
timestamp: June 24, 2018, 09:08:43 am
content: If you continue to open multiple threads about the same thing you will end up banned. This is not the way to get help as it is not helpful to you or anyone else and simply annoy's everyone.
Mainline or TI Kernel? - Page 1
Forum section: electronics / projects

author: JVR
author_rank: Regular Contributor
timestamp: August 20, 2019, 10:02:44 am
content: I'm hoping someone with some experience can chime in here, I'm starting my foray into Linux from the ground up, using buildroot on a AM335X CPU.I've gotten the latest mainline kernel to build (2019.02) and run, but I see that the EVM boards config pull the kernel from the TI Processor SDK.I would think that the TI kernel would have some bugs specific to the CPU arch fixed when it comes from TI, things that might not have been merged up the trunk yet. But there is also the risk that TI just decides to go another way, and the kernel ceases to exist on their GIT repo.SO my question is this, do I base my development efforts on the TI kernel, or on the Mainline kernel?

author: thinkfat
author_rank: Unknown
timestamp: August 20, 2019, 11:19:48 am
content: The main difference between the TI kernel and the mainline kernel is not about bug fixes but drivers and driver frameworks. The AM335x have a lot of nice peripherals like the PRUs, for which drivers have not been integrated into mainline, for whatever reason. If you want the best coverage of functionality, go with the TI kernel. Especially regarding power management, if it's important to you.

author: JVR
author_rank: Regular Contributor
timestamp: August 20, 2019, 11:21:51 am
content: Power management is one of the main things I'm looking at yes. I assume if I have the source for the kernel in GIT, not much will stop dev from continuing?This also raises the question, do I use buildroot or just their SDK?

author: thinkfat
author_rank: Unknown
timestamp: August 20, 2019, 11:41:21 am
content: Hm, I cannot answer that one. It depends on what you want to do eventually. Buildroot is more or less a kit to build a root filesystem for an embedded device. If that's what you're after, there ya go. The SDK is probably more targeted towards, well, system development. If you want to port your own OS to the platform, the SDK is the right thing, or if you want to build hardware based on the platform.
Mains and data track crosstalk question  - Page 1
Forum section: electronics / projects

author: MadScientist
author_rank: Frequent Contributor
timestamp: February 13, 2022, 07:45:10 pm
content: Interaction between mains and data lines on a pcbI don’t normally do much with mains on pcbs. But this project has some mains ( 230vac)tracks running on one side of the pcb and a few data lines on the other side . The data lines are Ws2812D 5V data lines to an led array. The mains trace passes on the other side of the pcb board offset by about 1-2mmAm I likely to be worried about coupling effects ?Thanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 13, 2022, 10:31:17 pm
content: Certainly better to avoid. Maybe it's not a problem, no idea.If there are no vias nearby, holes, slots, board edges, then creepage is fine, and insulation is through the board. Solid PCB is reinforced insulation.Tim

author: uer166
author_rank: Super Contributor
timestamp: February 13, 2022, 11:06:48 pm
content: Quote from: MadScientist on February 13, 2022, 07:45:10 pmDo you care about passing conducted EMC standards? This is likely to fail it due to coupling, but functionally it should be A-ok if the creepage/clearances are maintained.

author: MadScientist
author_rank: Frequent Contributor
timestamp: February 14, 2022, 10:35:55 pm
content: dont care about EMC standards on these boards, once the coupling doesnt deter functionailty , creepage on the mains side of the pcb is fine ( > 2.5 mm) . The AC lines are very low power , just 230VAC neon indicator feeds and returns
Mains bidirectional switch (possibly using MOSFETS)? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: July 25, 2020, 04:40:08 pm
content: Hi,not much experience in high-voltage power applications. I need to switch mains power (220V) going into a power board with very large capacitors so it needs to be switched on and off at zero crossing.I have been searching on the internet but maybe not the right words because could not find anything that meets the requirements below.I am looking for a suggestions/solutions with the following requirements:- either discrete or IC or PCB mountable mini module (not a relay obviously because it needs to switch at the zero crossing)- switching mains 220Vac on and off at crossover point (one of the reasons is that I am charging large capacitors at mains voltages- continuous current at least 13A- to be controlled by a micro floating at some other voltagesAnother would be nice feature (but not required) is zero crossing detection that can be fed into a microcontroller.Any suggestions of parts or schematics?Many thanks

author: OM222O
author_rank: Frequent Contributor
timestamp: July 25, 2020, 04:52:46 pm
content: Easiest component will be a triac or SSR but they have a bit of leakage. As for the zero crossing / micro, it's best to use a small SMPS / transformer and use it to power a zero crossing detector + an opto coupler. The MCU can drive the opto, turning it on, which combine with the zero crossing detector, turns on the triac. There's actually a post regarding a low power zero crossing detector on the first page of the forum if you scroll down a bit.
Mains Harmonics measuring instruments operate unusually? - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: December 19, 2017, 09:08:40 pm
content: HelloWhy do instruments which measure mains harmonics of SMPS’s , measure the harmonics by considering that the fundamental current sinusoid is the fundamental of the actual mains input current waveform?As you can see in the attached waveform showing mains input current and voltage to a PFC’d SMPS, the fundamental of the actual current is not quite in phase with the voltage in this case.As such, the fundamental current sinusoid should be that 50Hz sinusoid component that is in phase with the voltage, do you agree?Then, for example, for Class C equipment, the 9th Harmonic maximum should be 5% of that fundamental, and so forth.

author: Phoenix
author_rank: Frequent Contributor
timestamp: December 20, 2017, 02:28:08 am
content: Quote from: treez on December 19, 2017, 09:08:40 pmWhat? No!The fundamental component is the entire 50Hz component, regardless of phase. It is then broken down into real and reactive components based on phase.

author: ocset
author_rank: Super Contributor
timestamp: December 20, 2017, 06:08:15 am
content: Thanks, i was forgetting that mains harmonics pertain to core losses (ie heating) in mains power system transformers, and so the phase of the current is not relevant in the restriction of the harmonics levels.

author: Berni
author_rank: Super Contributor
timestamp: December 20, 2017, 06:43:12 am
content: Harmonics and power factor are not the same thing!Power factor is just a ratio between the apparent power and real power. Both harmonics or phase shift cause this ratio to get worse. The worse the ratio becomes the more Amps are flowing trough the wires to bring the same amount of usable power to the load.

author: ocset
author_rank: Super Contributor
timestamp: December 20, 2017, 07:58:27 pm
content: Thanks, the point about Mains Harmonics though, is that they are limited not only as part of improving power factor, but for the fact that too-high harmonics levels cause heating due to core losses in the mains power system transformers, do you agree?I mean, as you know, its possible to have a power factor which is a pass in the regulations, but you can still fail on mains harmonics.

author: dmills
author_rank: Super Contributor
timestamp: December 20, 2017, 09:59:41 pm
content: Different regs for different reasons...The power factor stuff is mainly an efficiency thing, the harmonics stuff is about limiting flat topping of the voltage waveform due to the interaction of the harmonic load and the supply impedance.The fact that triplen harmonics sum in the neutral and end up heating up delta/star transformers is a fairly minor consideration for most loads (There are exceptions).Regards, Dan.
Mains harmonics testing of 150W Offline LED driver. - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: July 02, 2017, 01:23:51 pm
content: I appreciate that for Europe/UK, the regulatory bodies test SMPS’s for mains harmonics at 10V intervals between 195VAC and 265VAC……But is it only the result at 240VAC that determines if it’s a pass or fail?

author: SeanB
author_rank: Super Contributor
timestamp: July 02, 2017, 02:37:03 pm
content: As those voltages are all allowable voltages in the spec, I would guess they take the highest value as the result.

author: ocset
author_rank: Super Contributor
timestamp: July 02, 2017, 03:17:35 pm
content: Thanks, our product fails badly at 265VAC, do you know what we can do?It just passes at 240VAC.Do you think the British government would give us special dispensation to sell the product even though we failed mains harmonics?...after all, we are paying tax to the British government. The thing is the entire electrical power network of the UK is entirely owned by the French, (every transformer, every substaion, every pylon, every metre of cable in UK, is French owned). -So therefore, do we have to go and ask the French if we can pollute their mains electricity network in UK with our out-of-spec harmonics?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 02, 2017, 04:32:41 pm
content: Wat.

author: ocset
author_rank: Super Contributor
timestamp: July 02, 2017, 08:08:04 pm
content: Thanks for getting back, please can you advise for certain if Mains Harmonics in UK needs to be passed over the entire mains input range (240VAC +/- 10%), or just at 240VAC?The product is a 150W offline LED driver.

author: floobydust
author_rank: Super Contributor
timestamp: July 02, 2017, 09:25:38 pm
content: Which mains-EMC test standard are you talking about?BS EN 61000-6-4 says "... at the rated supply voltage, unless otherwise indicated in the basic standard."If you have a marginal pass at 240VAC and a fail around 265VAC, then you need a few more dB filtering or have a stability issue.Trying to fudge your certifications this way is a bad idea. I've seen it many times, pressure to ship product and squeak through regulatory.

author: ocset
author_rank: Super Contributor
timestamp: July 03, 2017, 05:00:54 am
content: QuoteThanks, i am speaking of the EN61000-3-2The standard referrign to Mains Harmonics of electrical products cnnected to the mains

author: floobydust
author_rank: Super Contributor
timestamp: July 03, 2017, 05:24:16 am
content: I haven't designed to it, looked athttp://www.reo.co.uk/files/reo_guide_to_limits_for_harmonics_en61000-3-2.pdfgives:EN 61000-3-2 is power line harmonics THD, only up to 2kHz (40th harmonic of 50Hz) and done at 230VAC.
Mains Plug attenuator - Page 1
Forum section: electronics / projects

author: sahko123
author_rank: Frequent Contributor
timestamp: March 21, 2020, 05:10:25 pm
content: I'm having trouble with interference on my mains and wanted to create a plug that simplified probing the mains and made it a good bit safer. My idea was to use high value resistors (1M to 10M) to simply attenuate the mains to reduce the voltage by a known amount is there anything to consider safety wise or traps that I might fall into?

author: bob91343
author_rank: Super Contributor
timestamp: March 21, 2020, 08:42:59 pm
content: You are asking for serious trouble here. Any test equipment connected to mains will create a dangerous situation. You should be using a differential probe but those are expensive, especially if you want safety with over 100 Volts common mode.

author: Gyro
author_rank: Super Contributor
timestamp: March 21, 2020, 08:43:30 pm
content: Nope, sorry. That will inevitably end up with you connecting the ground clip to mains neutral and causing a safety issue.The other problem is that inserting a straight 1 - 10M resistor would form a low pass filter with the input capacitance of the scope probe, causing you to lose the high frequency noise that you're looking for.The 'proper' way to do it would be use a high voltage differential probe, but you're looking at significant cost. However I think you could probably get away with a small (as low wattage as possible) toroidal mains transformer, say, 24V output. This would give you the important mains isolation that is needed.One of the downsides of toroidal transformers, compared to ordinary ones is that they tend to couple more high frequency noise. This seems like exactly what you want.

author: sahko123
author_rank: Frequent Contributor
timestamp: March 21, 2020, 09:34:18 pm
content: i more or less just wanted to know what the mains voltage is at multiple points in my house using a handheld multimeter and divide the voltage down by a known amount

author: Prehistoricman
author_rank: Regular Contributor
timestamp: March 21, 2020, 09:59:17 pm
content: If you did want to scope it, would the following work?I don't see how it could be a safety risk (either to the operator or equipment).It's basically a potential divider on both wires to earth. Should have low common-mode voltage and isn't able to provide enough current to hurt anyone.

author: sahko123
author_rank: Frequent Contributor
timestamp: March 21, 2020, 10:07:21 pm
content: yeah that's almost exactly what i've done just a 10m and 100k potential divider (live through 10m into 100k to earth same with neutral). all this is contained in a UK plug
Mains power connectors for 3D printer cabinet controller - Page 1
Forum section: electronics / projects

author: ajo518
author_rank: Contributor
timestamp: October 02, 2016, 02:27:04 am
content: I am making a controller for the power supply, some lights, and a heater for my 3d printer cabinet. The goal is to have a box with one power in and 4 switched outputs based off or relays. I already have all of this set up, but want to put everything in a proper enclosure with connectors.I was thinking of using powerCon connectors, but they are expensive. I saw some clones on ebay, but didn't know if anyone had experience with them. These connectors are not going to be removed and replaced a lot, so quality is not a huge issue as long as they work and are safe.I also thought about doing standard IEC for the input, but didn't know what to use for the output then...I am in the us so 120V and the current for the psu is 17 amps and the others are under a couple of amps. Im not concerned about plugging the wrong thing into the wrong socket so I'm ok with the connectors for everything being the same as I will be the only one that touches it.Also the input and one of the outputs needs to be grounded. Are there any other connectors that I should look at? Any thoughts on the knockoff connectors?Other related question. I would assume that it is better to have the microcontroller out of the enclosure with mains correct? What is done in industry with power controllers is the logic in the same enclosure?Thanks!

author: amyk
author_rank: Super Contributor
timestamp: October 02, 2016, 03:23:16 am
content: Panel mount IEC females are also available... as are cable-mount IEC males. I wouldn't consider anything else. But it seems your application might not even warrant connectors; a terminal block could be sufficient.

author: ajo518
author_rank: Contributor
timestamp: October 02, 2016, 04:08:27 am
content: you are correct that I don't need connectors and I currently have it all connected with a terminal block.I want it to look professional as I want to use it in interviews and such...Here is a link to ebay with the connectors I was thinking about:http://www.ebay.com/itm/10-set-Neutrik-PowerCON-Type-A-NAC3FCA-NAC3MPA-1-Chassis-Plug-Panel-adapter-/152177631062?hash=item236e7e5f56:g:3A8AAOSwtnpXksX5I can order them from amazon which makes me feel a little better... at least I can get my money back if they are awful..Any other opinions
Mains powered neon indicator lights  - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: August 07, 2022, 02:29:24 am
content: I know they are primarily designed as a human visual thing, but can they be used as a fast indicator of voltage in an automation system?In other words, do they have instant startup, as in the first cycle, or does it take several cycles to get up to full brightness?Once running does the light level follow the shape of the waveform, or is there a persistence that smooths the light output?

author: TheMG
author_rank: Frequent Contributor
timestamp: August 07, 2022, 04:14:27 am
content: They're pretty fast, fast enough they are often used as a visual indicator you can connect in series with a spark plug on an engine to visually see if it's firing.As for following the waveform... Not really. They have a striking voltage where the neon gas becomes ionized and starts to conduct, then the voltage across the neon decrease quite significantly (once lit, it takes less voltage to keep it lit). They must always be driven by a current-limited source (series resistor usually) or it will try to draw A LOT of current and blow up.

author: Sarvesaa
author_rank: Contributor
timestamp: August 07, 2022, 09:07:28 am
content: Quote from: e100 on August 07, 2022, 02:29:24 amYeah I even took some photos of it and sent it to the mailbag address.Our Dave even showed the photos in the mailbag video of the 2021 Christmas.It is our persistence of vision that makes us think that the bulb is on continuous.The actual fact is that one electrode light up for 25 times and goes off the other electrode 25 times on and off within a second.It is so fast for our eye to see.

author: Zero999
author_rank: Super Contributor
timestamp: August 07, 2022, 09:43:45 am
content: Quote from: Sarvesaa on August 07, 2022, 09:07:28 amYou mean 50 times per second, assuming the supply frequency is 50Hz.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 30, 2022, 08:35:28 am
content: in all our multiplexed neon nixie tube clockswe run at 400Hz muxing frequencythis frequency is the fastest we can run with out causing loss of brightnessdue to the time to fully turn on the digit,neon tube indicators have exactly the same behavior,so yes, you can run them faster, need more spiked / speed up current,like a capacitor over the series resistor for speed up, fast turn on,also the smaller neon it is, the shorter time to fully cover the electrode.by the way : the reason for fast muxing on a clock, is to make the digits not flickerwhen you move your head or eyes, some people see this much easier then others,