hybridfree/eevblog-posts huggingface dataset:
Current supply rating for 24vAC transformer - Page 1
Forum section: electronics / projects

author: gooseEL34
author_rank: Regular Contributor
timestamp: February 09, 2014, 01:01:54 am
content: Hey all-I have a guitar effect pedal that has a "wall wart" The wall wart has a 2 prong (I am in the States) plug and inside is a transformer, for which the secondary has three taps. The printing on the unit says:Input: 120vAC -- 2.1WOutput 24v AC @ 6VAI have never seen the nomenclature VA used as such. I usually expect on a power supply for my guitar effects to sayInput: 120v AC -- 50-60 HzOutput: 9v DC @ 300mAI am having to rebuild the power supply for this unit. The secondary is center tapped.Here is a link to the schematic of the pedal:http://analogguru.an.ohost.de/193/schematics/Chandler_TubeDriver.gifEssentially, the transformer is centertapped to ground and the 12-0-12 is rectified through a full wave bridge rectifier to +12 and -12 vDC supplies. This is a pedal which uses a 12ax7 tube running at tiny voltages (compared to the 190-210 volt plate voltages normal found in guitar tube preamp circuits)So...basically....can I tell from this line OUTPUT: 24VAC @ 6VA what current is safely supplied by this transformer??Again, I have never seen VA used as a unit.ThanksTim

author: sacherjj
author_rank: Frequent Contributor
timestamp: February 09, 2014, 01:22:41 am
content: VA or Volt-Amperes is a common way of rating AC devices. It is simply RMS Voltage multiplied by RMS Current. The reason this is not called Watts, is that is reserved from real power. With AC, your real power may actually be lower than your apparent power.You are looking at a secondary capable of 6 VA / 24 Volts RMS = 0.25 Amps RMS
current through laptop computer on top of esd mat - Page 1
Forum section: electronics / projects

author: mcn4mee
author_rank: Newbie
timestamp: August 07, 2015, 08:11:18 pm
content: I have an esd mat on my desk and I often set my MacBook Pro on the mat while I'm using it. A few days ago my hard drive failed so I replaced it. The new hard drive is thinner than the old one. As soon as I started using it with the computer on the mat I could feel a mild tingle of current when touching the computer. If I take it off the mat, there's no tingle.I'm wondering if the old, thicker hard drive was in contact with a ground or something that the new drive, being thinner, isn't contacting.The old drive was original, a Hitachi 7K500-500. The new drive is a Western Digital WD5000LPLX. Both are 500gb, SATA, 7200 rpm.Has anyone ever heard of this happening?

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: August 07, 2015, 11:13:03 pm
content: I was repairing a CRT TV many years back on an ESD mat (in a workshop) and guys down the bench 1 m from me (same mat) were getting tingling shocks. The High Voltage was conducting thru the mat. Surprised the hell out of me as well!But that was quite HV. ESD mats are either conductive (<1meg) or resistive/conductive (>10meg ~ 100meg) surface resistance. I cannot remember what we had, I suspect we were using the conductive mats.I'd doubt low voltage would be an issue but that depends upon the mat. It would be possible for a HDD PCB to conduct from one point to another when in contact with a conductive mat, but unlikely due to the low voltage.

author: Berni
author_rank: Super Contributor
timestamp: August 08, 2015, 04:29:04 pm
content: This tingling happens due to the mains power supply/charger leaking mains voltage over itself.I noticed the effect myself on a mac mini before. That one leaked enough current to turn on a LED pretty well if you held one end and touched the metal case with the other.

author: timb
author_rank: Super Contributor
timestamp: August 11, 2015, 10:19:26 pm
content: Happens to me with my MacBook Air as well. If you want to prevent it, use the three-pronged cord in a grounded outlet (as opposed to the two prong flip down plug).Sent from my Smartphone

author: ivan747
author_rank: Super Contributor
timestamp: August 16, 2015, 10:06:19 pm
content: I used tu use a macbook pro. When I plugged it in using the original ungrounded plug, I'd get a tickle while touching the machine and the painted concrete wall. Didn't happen with the grounded extension.Sent from my XT1063 using Tapatalk
Current transformer to 0-10v analog output - Page 1
Forum section: electronics / projects

author: haxby
author_rank: Contributor
timestamp: January 06, 2022, 08:23:37 am
content: Hi all,I'm looking at logging my house power consumption and solar generation.I have an analog data logger.Is there a device that will give me an analog voltage based on ac current draw?I see a bunch on ali-express but the details are sketchy. I don't want a sine wave output. I prefer a steady voltage that coincides with the RMS measured current.Say 1v out per 5 amps measured.I know there are standalone systems available, but I'd prefer something with an analog signal so that I can build a circuit to turn on various loads as required.Any ideas?

author: moffy
author_rank: Super Contributor
timestamp: January 06, 2022, 08:30:36 am
content: Here is a DIY project very much along the lines of what you want:https://solarduino.com/how-to-measure-ac-current-with-arduino/Hope it helps.

author: Terry Bites
author_rank: Super Contributor
timestamp: January 06, 2022, 01:43:28 pm
content: seehttps://www.allegromicro.comcurrent sensors. AC current to DC V.There are loads of prebuilt modules a moffy says. They usually have 66mv/A output scaling or 1V per 15AIf you need to re-scale it, say to 20mV/A, add an amplifier. egHow they make these modules cheaper than the Allegro part bulk price is a mystery or a worry. You decide.
Current Wave - Page 1
Forum section: electronics / projects

author: apoorv3in
author_rank: Contributor
timestamp: December 22, 2019, 06:49:15 am
content: Working on a auto range version of uCurrent with inbuilt display, data logging and streaming.

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: December 22, 2019, 07:07:00 am
content: Does that stream over USB or Ethernet?

author: apoorv3in
author_rank: Contributor
timestamp: December 22, 2019, 07:14:48 am
content: more imagesIt will stream data over usb

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: December 23, 2019, 03:22:03 am
content: Dude, where are you based out... I'm in Bangalore, India.

author: apoorv3in
author_rank: Contributor
timestamp: December 23, 2019, 03:39:40 am
content: I am also based out of Bangalore

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: December 23, 2019, 04:05:28 am
content: Great Apoorv.. Let us meet sometime after the holidays... I also do a lot of wood working and electronics. We can collaborate and share ideas. Let us try to get more people with similar interests together.

author: charlesrg
author_rank: Contributor
timestamp: February 16, 2021, 04:47:55 pm
content: Are you planning on adding data streaming for the model with Display as well ? This is a great product and will become more and more popular.

author: David Hess
author_rank: Super Contributor
timestamp: February 16, 2021, 08:46:28 pm
content: Quote from: apoorv3in on December 22, 2019, 07:14:48 amI hope that is galvanically isolated USB.

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: February 20, 2021, 08:14:30 am
content: Galvanically isolating USB is a difficult task, if aiming for 480Mbps speed. There are only a handful solutions out there to do that. Hifime makes such an isolated USB cable.https://hifimediy.com/product/hifime-high-speed-usb-isolator/

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 20, 2021, 04:40:30 pm
content: Quote from: EEEnthusiast on February 20, 2021, 08:14:30 amYes, but most often, unless you want to isolate an EXISTING device and don't have a choice, this isn't the right approach. If you're designing a product and want to isolate from USB, the easiest path is to isolate AFTER the USB interface circuit. Typically, you can use a USB interface chip (FTDI or CHxx or MCU or whatever...), directly connected and powered to USB, and just isolate the data signals (for instance UART, if you're using USB to UART) to the rest of the circuit. Much easier and much cheaper. There are cheap two-channel digital isolators these days that can handle up to a few Mbps (and much higher for a couple dollars more.) If you need power from USB, you'll additionally need an isolated DC/DC converter, but that's the same whatever solution you use. If your device OTOH is self-powered with batteries, then nothing more is required.
Curved Connection Interface for Rotatory Position Modules - Page 1
Forum section: electronics / projects

author: redknight106
author_rank: Newbie
timestamp: June 14, 2019, 01:45:48 pm
content: Hello.I've been working on a modular system for sometime now and I thought I would ask the wider audience their opinion for the best way to do this.I will basically have a core unit from which a selection of smaller modules can be slid into place to achieve a different function. The modules can then slide on a curved slot to changed the modules angular position to suit the user. I'm still working on the mechanism to keep the modules in position.At the moment the modules are 35x21x18mm wide and feature a small amount of electronics. Each module requires 5 pins from the core unit.I'm currently thinking of using a AVX 00-9155-005-002-016 5 pin vertical battery connector on the module which connects to a ridged curved PCB. Thinking a PCB thickness of 0.4mm or 0.6mm might do but I need to verify if I can curve the PCB to about a 20mm radius.Please see the attachments to get a idea of what I'm currently trying to do.At the moment I'm wondering the following:1) Should the battery connector be on the core unit and have a small bent PCB(or flex) on the module?1a) or replace the flex PCB with curved strips on copper.2) If I use flex boards I'm worried that the exposed pads ENIG finish will wear quite easily.I hope someone can aid in my odd task.Thank you for your time.
Custom 2.5-inch IDE SSD Assembly and Testing - Page 1
Forum section: electronics / projects

author: Trader
author_rank: Frequent Contributor
timestamp: January 19, 2023, 06:16:04 am
content: This guy projected, make, and programmed an SSD.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 19, 2023, 11:10:51 am
content: And ?Sure it's doable, kudos for thatBut the read and writes speeds are slooooooowBetter buying already made productsSince it is an pata interface, you have DOM (disk on module devices) or ide SSD, but you need the right model, since some os aren't managing the trim functionality

author: Trader
author_rank: Frequent Contributor
timestamp: January 19, 2023, 03:48:15 pm
content: I guess this guy is on track to someday do a 10Tb SSD on Gen 5 PCIe x4
Custom 20,000mAh Power Bank – 3D-Printed Case & DIY Assembly - Page 1
Forum section: electronics / projects

author: protolab
author_rank: Newbie
timestamp: March 03, 2025, 06:43:54 pm
content: Hey everyone,I recently built a custom 20,000mAh power bank from scratch and wanted to share the process with you. This project involved:Designing and 3D-printing a custom caseSoldering a BMS (Battery Management System) and integrating a charging controllerAssembling the high-capacity lithium cellsAdding a built-in phone stand for convenienceIf you're interested in electronics, battery packs, or custom enclosures, check out the full build process in my video:📺 Watch on YouTube -Would love to hear your feedback or suggestions for improvements! Let me know what you think.
Custom Arduino PCBs manufactured by JLCPCB - Page 1
Forum section: electronics / projects

author: whatsthegeek
author_rank: Contributor
timestamp: December 18, 2017, 01:30:29 pm
content: Hi, last week, I designed my first PCB ! It's an Arduino clone with built-in RGB led and 4 buttons.I just recieved the board today and I'm quit happy with how they turned outI recieved them 6 days after ordering them and got free DHL Express shipping because it was my first time ordering a PCB from them.It came wrapped up in a good quantity of bubble wrap, that's a good thing if the DHL guy isn't carefull...There are however a few things I didn't like:- The soldermask is slightly off-center- The silkscreen is has a line where it hasn't been printedBut, for $2 delivered, I can't realy complain...Here are a picture of the front and the back of the PCB:And here are a few pictures I took with my microscope (150x):These are the design files:For some reason, the "Board rev 1.0" disapeared in the design files, guess I forgot to save :/

author: saike
author_rank: Regular Contributor
timestamp: December 18, 2017, 03:56:20 pm
content: Did you ask first if they could cut the slots for the powerjack, or did they just do it anyway?

author: whatsthegeek
author_rank: Contributor
timestamp: December 18, 2017, 04:13:52 pm
content: I asked them, it was in the drill file.When you order a PCB, they just ask you for a zip containing the gerbers and a drill file.

author: whatsthegeek
author_rank: Contributor
timestamp: December 19, 2017, 09:45:55 am
content: Yes
Custom backlit logo on a switch ? - Page 1
Forum section: electronics / projects

author: BBBbbb
author_rank: Unknown
timestamp: July 19, 2018, 12:16:46 pm
content: A friend asked me if I know the best way to create a custom logo (transparent area) on a button.He's been restoring old (sports) cars, and often switches/buttons are worn out (color covered area peals) and need replacing. Usually he can find a replacement online, but not always, so he'd like to refurbish the existing buttons. He claims he has the appropriate paint he needs to repaint the switches (usually some matte black).The way I see it, protect the transparent area with a sicker of desired shape or engrave/etch after repainting the whole switch. Manual etching requires skills and he doesn't feel up to the task.Cheapest and easiest way to me seems like directly using one of those cheap alibay laser engravers that can accept custom computer generated shapes, thus allowing him to produce nice shapes regardless of his manual skills, but non flat nature of many switches makes machine processing (mechanical/laser) hard as far as I see it?That's why I think best way to do this would be cutting (maybe those cheap laser engravers/cutters) desired shape stickers as masks and painting over, or inverse masks and then etching with something sharp and acetone.Never thought about a task like this so there maybe a more obvious and easier solution. All solutions, or critiques to the proposed one here, are welcomed.

author: tooki
author_rank: Super Contributor
timestamp: July 20, 2018, 02:33:18 pm
content: Most backlit keyboard keycaps are made by making keycaps from transparent plastic, painting them, and then laser-etching the paint to ablate the lettering so it can glow. That would seem like a reasonable approach for switches, too. (I wouldn’t be surprised if that’s how a lot of them are made these days!)
Custom bench from 40mm "Maker Rails" - Page 1
Forum section: electronics / projects

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: April 23, 2019, 11:10:37 am
content: Having a few server rack sized instruments which are generally to deep to put onto a standard electronic workbench I decided to build my own.The underlying structure is built using standard 40x40mm I-Type aluminium extrusions cut to size. The workbench is a 27mm and the instrument shelf is a 19mm beechwood plate. Size of the work table is 2000x1000mm and the top shelf is 2000x600mm.So far I tested a couple of configurations and decided on the size of the instrument shelf and workbench. I'm currently oiling the plates and deciding on some last points:I'm still undecided about the exact construction of the shelf and the support structure. I find that the setup now is very stable. The height of the top shelf is pretty good so that instruments up there can be viewed and manipulated seated and standing. Also the height is perfect to place a monitor below on the workbench.But I'm not sure yet about the front beam of the instrument shelf. It provides optimum stability and might serve as a shade for LED lighting behind and as an attachment point for cables and probes. On the other hand while not in the line of sight to the monitor - It still seems a bit to close up.I might move that beam back behind the line of the monitor (while leaving the side structures as they are).Another thing are the additional shelves. The idea is to fit them between the top shelf and the workbench to put smaller / more regularly used instruments there (oscilloscope, bench multi meters usw). The monitor(s) should also be suspended so that the entire workbench remains essentially free below the shelves.One last point is the attachment of the wood plates. I'm not sure how much they will expand / contract over time so I do not want to screw them down too much. My current idea is to just screw together the bottom / top structure where they meet with two M8 bolts trough both beams and the 27mm plate. And similarly screw together the top shelf with another set of sunken in M8 Bolts on both sides. The plates, in particular with all the loading, should then hold together pretty well.
Custom decade box for precision trimming, power sinking. - Page 1
Forum section: electronics / projects

author: amosborne
author_rank: Contributor
timestamp: July 12, 2022, 02:00:00 am
content: I recently finished a project of mine-- a decade box that is also a load box.I've attached a few pictures below in case anyone is interested.I also have a short write-up with more pictures on my website.https://www.osborneee.com/decade-box/

author: amosborne
author_rank: Contributor
timestamp: July 12, 2022, 02:45:01 am
content: Some more pictures below.

author: wizard69
author_rank: Super Contributor
timestamp: July 12, 2022, 05:25:00 am
content: Pretty neat! I'm not sure I'd put load resistors in the same box as my decade array but I must say it looks nice.

author: beanflying
author_rank: Super Contributor
timestamp: July 12, 2022, 07:07:55 am
content: Nice tidy boxI dropped the low resistance ones of my three boxes into their own but I can also pull 15A at 7V through minehttps://www.eevblog.com/forum/beginners/dummy-load-for-bench-power-supply-resistors/msg3786482/#msg3786482EDIT - Went looking for pics of my other two boxes and nopeAnyway the 10-100 box also sits by itself and the higher resistance box is generally not going to drop a lot of power. There is now dials under the knobs too

author: amosborne
author_rank: Contributor
timestamp: July 12, 2022, 12:58:40 pm
content: Whoa I’m jealous of those massive switches.

author: beanflying
author_rank: Super Contributor
timestamp: July 12, 2022, 01:12:31 pm
content: Only cheapies but I ganged the two and three layers for more current capability on the 10-100box in particular.

author: daqq
author_rank: Super Contributor
timestamp: July 12, 2022, 08:02:16 pm
content: Quote from: amosborne on July 12, 2022, 12:58:40 pmSearch on ebay for russian switch or soviet switch - there's a lot of new-old stock available:https://www.ebay.com/itm/284683768221?hash=item424879919d:g:ZtwAAOSwfR1ZbiRA

author: beanflying
author_rank: Super Contributor
timestamp: July 13, 2022, 07:58:41 am
content: Decade Box Switch PornThe Cambridge Decade Resistance and Capacitance boxes I used to own. I actually moved up a level of precision in commercial boxes from these even though they are missing some switch bling.
Custom desoldering station using Weller DSX 80 - Page 1
Forum section: electronics / projects

author: Tebbit
author_rank: Newbie
timestamp: July 03, 2023, 03:37:07 pm
content: So i bought this brand new old stock Weller DSX 80 desoldering gun on ebay for 200€. And i'm stuck on what kind of thermocuple weller is using. I can only read 22 Ohms at 23°C, if i heat the tip with a heat gun the resistance changes from 22 ohms to 35 ohms. From my guess its some kind of PT, but not PT100.I wanted to use Shinko regulator with SSR and 24V transfomer.If anyone has any ideas for what they are using much obliged.
Custom flexible cable tooling costs - Page 1
Forum section: electronics / projects

author: Poe
author_rank: Frequent Contributor
timestamp: October 23, 2015, 02:29:38 pm
content: I'm trying to get an idea of the costs associated with a small flat flex cable with 10 conductors, 0.100" pitch, 3" long, all one side, custom shape, no crazy specs with temp or otherwise.Just looking for a rough ballpark idea of MOQ, tooling costs and/or piece price... within an order of magnitude or so.It's to replace a board-to-board interface for a product that already exists. Volume would be ~40k annual if that helps.Thanks.

author: Poe
author_rank: Frequent Contributor
timestamp: October 24, 2015, 05:48:25 pm
content: So I've received quotes from two USA based sources. One is telling me their MOQ is 10k pieces, $200 setup cost, no tooling costs, $8 per, 12week LT. The other has a higher piece price of $25 per at 100 piece MOQ, $3k tooling, 8week LT.Feels too high for what is basically a single sided circuit board with ten strips of copper and no mask, silk or holes.... that just so happens to be flexible.Maybe I'm just looking at the wrong places. Could anyone recommend a place?

author: jt
author_rank: Regular Contributor
timestamp: October 24, 2015, 09:49:49 pm
content: My experience is with small quantity, and more complicated FPC so I don't know if this will translate well to your application. However, when my company did initial vendor selection we found that Altaflex was ~5x cheaper than several other U.S. sources. This might have been unique to the particular technology we needed. Either way, I'd suggest you give them a try; I've been very happy with their quality and they've never shipped late, even for rush-jobs.You might also want to look international with that kind of volume. I would expect a Chinese vendor wouldn't have a hard time meeting your specs and I would assume the cost would be much less than domestic.

author: jeroen74
author_rank: Frequent Contributor
timestamp: October 25, 2015, 07:59:18 pm
content: I once looked athttp://www.leiton.de/en-kalkulation.htmlto get an idea how expensive a flexible PCB would be to replace a cable in one application. Turned out it was a lot cheaper than I thought.

author: ovnr
author_rank: Frequent Contributor
timestamp: October 26, 2015, 01:34:34 am
content: I'm sure there are cheaper suppliers.Dirty PCBs does 10x10cm prototype flex circuits for $9/pop (10-off). I suppose you might be able to fit multiple cables into a 10x10cm space, so it'd be even cheaper. Note that it does not include connector stiffeners; but if they can do it for that price with no setup cost, I'm sure a chinese board house will handily beat them for a volume order.

author: Poe
author_rank: Frequent Contributor
timestamp: October 26, 2015, 02:43:01 pm
content: Thank you all very much. That was very helpful.

author: jt
author_rank: Regular Contributor
timestamp: November 01, 2015, 11:38:17 pm
content: As a data point, I'd be interested what you end up choosing - or at least a summary of your final observations.
Custom FSR Matrix - Looking for manufacturers - Page 1
Forum section: electronics / projects

author: PeterFW
author_rank: Frequent Contributor
timestamp: January 28, 2020, 11:30:11 am
content: Hello!Has anyone experience with ordering a custom FSR Matrix?I already ordered a sample at Sensitronix and the only other manufacturer i found was Kitronyx but they are out of my price range.Looking for something along the lines of 30x10cm with around 4 sensors per mm².So... round about 12 by 4 inches at maybe 25DPII do not need a custom one, but i have not found something in that size.Greetings,Peter

author: Biddyyhz
author_rank: Newbie
timestamp: September 06, 2023, 06:37:48 am
content: Peter,Did you ever find a manufacturer? I too are looking to no availPlease advise if you are willing to share.Bill
Custom HDMI  Matrix - Page 1
Forum section: electronics / projects

author: ProxyByte
author_rank: Newbie
timestamp: February 04, 2015, 12:53:10 am
content: I have a special case that I want to have 6 hdmi devices that I can switch to 2 different displays. And searching for these devices showed they were in the upwards several hundreds to thousands of dollars.Controlling the device with momentary switches would be the best option, but if it could be controlled via RS232, USB, or Ethernet would be a bonus.I was looking into different ways of designing a solution.At first I thought of just using a FPGA, which in my mind would be the easiest and cleanest and have all functionality in one device.Then I looked into devices that already are built for this purpose. IE MAX4814Ehttp://datasheets.maximintegrated.com/en/ds/MAX4814E.pdfTaking 6 of those to create 2 daisy chained pairs of 3 muxes.Then the last option is just using a bunch of high speed logic muxes.Anyone have any input or feedback?

author: ovnr
author_rank: Frequent Contributor
timestamp: February 04, 2015, 01:08:16 am
content: It's non-trivial.The MAX4814 device will not work; it is only intended for switching the power and DDC signals, not the high-speed data pairs.Issues in general:* You will need to route 24 incoming TMDS pairs and 8 outgoing pairs, in addition to whatever is needed for linking your switches together. They will operate at several hundred MHz, and require at least a 4-layer board. You will likely end up at 6 or 8 layers. Just routing it is not for the faint of heart, as they all need to be length-matched too.* Your output devices will not take kindly to you switching the signal, and will blank out for up to several seconds while they re-synchronize.* Your input devices will only know what they're connected to; this means four out of your six devices will not see an output device, or if they do, not know what it is, and may refuse to output video. You may implement a DDC "server" to transfer DDC data to your sources, but if your output devices are different, all bets are off.You will also not be able to mirror the output of one source onto both output devices while retaining HDCP.Now that the "You shouldn't do this unless youreallyknow what you're doing" speech is over:The best option is probably theTMDS4424-to-2 switch. You may be able to daisy-chain two of them (route four sources to one chip, then the two outputs from that chip to the 2nd chip along with the other 2 sources).Good luck!

author: rx8pilot
author_rank: Super Contributor
timestamp: February 04, 2015, 04:10:19 am
content: Quote from: ovnr on February 04, 2015, 01:08:16 am+1I am not sure what skills/experience the OP has, but there is a good reason the commercial boxes that do this are not cheap. It is a substantial effort from beginning to end. Are you trying to make one or two to "save" money or are you designing a commercial product.Have you done high-speed PCB layout before? Even if you have the devices - MUX engine, line drivers, sync delay, etc....the PCB will decide if it works or not. You will also need a very fast scope to see if you got it right or not.
custom lcd display design ,14segment   - Page 1
Forum section: electronics / projects

author: electronx
author_rank: Regular Contributor
timestamp: August 15, 2021, 07:45:11 pm
content: Hello everyone, I'm trying to produce a custom LCD display, I watched Dave's videos and learned a lot.I have a problem here.The mentality here is that the elements of each segment need to be connected to different common depending on the matrix scan type. There is no problem for 7+1 segment display, because almost all drivers have 8 com pins. I want to use a 14 segment display in my design, but I could not find a driver / controller with 14 com pins. In this case, should I use more than one driver?Here is a second situation that stuck in my head, I will have to define the characters to the microcontroller I will use and do some kind of decoder operation, and I am afraid that if I use more than one driver, things will get mixed up.

author: wraper
author_rank: Unknown
timestamp: August 15, 2021, 07:58:54 pm
content: QuoteWhy would you use com pins for driving segments?

author: electronx
author_rank: Regular Contributor
timestamp: August 15, 2021, 08:06:11 pm
content: If you look at the sample documentation you can see that each segment element is connected to a different com pin if you scan from top to bottom it seems clearer, I'm pretty new to this and I guess I can't see or think of things, please excuse me if I'm making a simple logic error.

author: wraper
author_rank: Unknown
timestamp: August 15, 2021, 08:27:51 pm
content: Segments are connected to seg pins which you have tons of, not to com pins. Common pins of LCD are connected to com outputs.EDIT: But regardless of that most likely you will have more than one common pin per digit and less than 14 segment pins per digit due to routing within LCD. Each digit likely will be divided into several common pins and some segments will be connected together.
Custom LoRaWAN Node settings issue - Page 1
Forum section: electronics / projects

author: GTV31
author_rank: Newbie
timestamp: April 26, 2017, 09:46:05 pm
content: Hello everyone,I have the following situation:I am building a custom LoRaWAN node for uni telecom project. I followed the document provided by Microchip: "LoRaWAN™ Library Plug-in for MPLAB® Code Configurator User’s Guide" (http://ww1.microchip.com/downloads/en/DeviceDoc/40001864A.pdf). The main hardware that I am using is PIC18LF46K22 and SX1276 (just as in the document).After performing all the settings described in the document, it arrived the moment to upload the simple LoRaWAN node code, provided at the end of the document, so I can test the hardware. When I did the first build of the code, MPLAB gave me as an output: Build FAIL and the error was at function LORAWAN_MainLoop() => (Unable to resolve identifier);. If I comment out this line, the code will build and I can even upload it in the chip, however, the node will not transmit data since this function is used for running the system timers and checking the DIO pins (in summary, it runs the LoRaWAN stack).Thus, my question is: has anyone gone trough the same issue and managed to resolve it?I know I can directly contact Microchip, although lets just say that they are not very cooperative.Thank you for your attention.Kind regards,

author: GTV31
author_rank: Newbie
timestamp: April 26, 2017, 09:51:35 pm
content: Just found the solution.The problem is in the given example code.This one says:while (1){// Add your application codeLORAWAN_MainLoop();// All other function calls of the user-defined// application must be made hereLORAWAN_Send(UNCNF, 2, "LoRa", 4);}and it should be:while (1){// Add your application codeLORAWAN_Mainloop();// All other function calls of the user-defined// application must be made hereLORAWAN_Send(UNCNF, 2, "LoRa", 4);}A spelling mistake in the LORAWAN_Mainloop(); , its written with small (l) not capital (L).Thank you for the attention guys. Hope this can help you.
Custom Milled and Turned Hot Air Nozzels Solder Tip's?  - Page 1
Forum section: electronics / projects

author: KG7AMV
author_rank: Frequent Contributor
timestamp: November 23, 2014, 01:24:32 am
content: I was thinking about this from past experience most the nozzles for hot air machines are rather cheap? I do not have the funds to have a Metcal, Pace or JBC laying arround not to tool them up!So, I was thinking maybe I should make my own I have the Equipment to do it!For the hot air nozzles I was thinking of using good quality stainless or ?. I am Not sure about Soldering Tips but it would doable if I can source proper materials and tech spec's!My milling Machine small but does every thing I have needed it to do!Building a CNC Lathe should be complete in a week or so.

author: zapta
author_rank: Super Contributor
timestamp: November 23, 2014, 01:48:36 am
content: What is the problem with the cheap nozzles? Don't they work just as good? (That's what I am using and never had a problem)

author: KG7AMV
author_rank: Frequent Contributor
timestamp: November 23, 2014, 02:07:05 am
content: I just want an excuse to make something!

author: PaulAm
author_rank: Frequent Contributor
timestamp: November 23, 2014, 02:13:00 am
content: You clearly need some projects for those machines. I don't see a single chip anywhere

author: KG7AMV
author_rank: Frequent Contributor
timestamp: November 23, 2014, 02:17:59 am
content: As for the time and effort! It is the satisfaction of making/fixing what you use well I like to fix the things I have when they break and make stuff I want or need!Quote from: PaulAm on November 23, 2014, 02:13:00 amHere are The Drivers! Feel Better!
Custom modification for CSR ADK4.0.1 sink project - Page 1
Forum section: electronics / projects

author: mahaju
author_rank: Newbie
timestamp: June 07, 2017, 01:37:20 am
content: I want to make a custom modification to the CSR ADK4.0.1 sink projectA CSR 8675 module running the sink project can be connected to a smartphone to use as a bluetooth headsetThe CVC library that comes with the sink project provides noise reduction, feedback cancellation, and other DSP operations during a telephone callThe CVC algorithm gets invoked only when a telephone call is initiated with the smartphone that is paired with the CSR 8675 moduleI want the kalimba DSP project containing the CVC algorithm to get invoked without having to make a telephone callIs this possible, and if yes, how can I do it? If this is not possible, could someone point me to the relevant documentation that explains why it's not?
Custom NFC antenna design - Page 1
Forum section: electronics / projects

author: yiancar
author_rank: Contributor
timestamp: March 20, 2018, 07:00:04 pm
content: Hello everyone,I am trying to design a custom PCB antenna for the NT3H2111 eeprom/i2c chip. (https://www.mouser.com/ds/2/302/NT3H2111_2211-1127378.pdf).I have read the NXPs appnote (https://nxp.box.com/s/pog3vbw5jasgx3p84q4s) however it just confused me even more. Has anyone used there excel calculator and is willing to help? It seems that most appnotes for custom antenna design require a background wireless knowledge I dont posses so I would appreciate any link to further help out!

author: krho
author_rank: Regular Contributor
timestamp: March 21, 2018, 05:56:31 am
content: And along with that you'll need the access to the VNA

author: yiancar
author_rank: Contributor
timestamp: March 21, 2018, 04:38:22 pm
content: There is a VNA at my University. I presume thats that the only good enough way to make the measurements?

author: yiancar
author_rank: Contributor
timestamp: April 06, 2018, 02:31:18 pm
content: Ok that was much simpler than expected. Hooked up a coil on the VNA and coupled it with the pcb. Then added/removed capacitance as necessary
Custom or European enclosure? - Page 1
Forum section: electronics / projects

author: Rutger
author_rank: Regular Contributor
timestamp: April 11, 2015, 04:32:41 pm
content: I have searched high and low for any box/enclosure that comes even close to the picture below.The company that makes these controls boxes is from Italy and I suspect that this is made somewhere in Europe, but have looked at many websites and could not find anything close.If anyone has any clues on were to find a enclose like it or a website that sell enclosures in Italy/Europe, please send me a link, I will be forever grateful and buy you a coffee or beer if you ever come to Denver Colorado.Thanks for looking!

author: Rutger
author_rank: Regular Contributor
timestamp: May 07, 2015, 10:00:14 pm
content: Anyone???

author: kjs
author_rank: Regular Contributor
timestamp: May 07, 2015, 11:20:13 pm
content: could be from multiple companies and most likely a custom design. At least two companies in Germany, one in Italy, one in Spain and one in Turkey....
Custom or ready-made keypad at consumer goods standard - Page 1
Forum section: electronics / projects

author: Wilson__
author_rank: Frequent Contributor
timestamp: May 03, 2024, 04:21:36 pm
content: Any idea where to buy custom or ready-made keys (we need 4 to 8 key) that are standard consumer electronics quality, similar to remote control as in photo. Eitherea. Rubber sheet with conducting bit, as used in the remote control photob. Plain rubber sheet to cover keyswitch as in photo (as used by mobile phone power, volume)Many thanks

author: RitschRatsch
author_rank: Newbie
timestamp: May 05, 2024, 07:41:41 pm
content: Hello Wilson,There are some details missing for your request.What frequency do you need?What exactly do you want to do?How many keys would you like?Bluetooth or IR?What size are you looking for?With kind regardsRitschRatsch
Custom or special IR LED manufacture? - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: July 23, 2019, 10:45:20 am
content: Hi,Does anyone, by any chance, have any experience of custom LED manufacturing & manufacturers? Ideally I need two IR LEDs, with different wavelengths, say 740 & 855nm, in one smallish package, say 0603. Regarding economics: this would be in smallish quantities, say 10,000s initially, but for a high-value biomedical application.TIA, Alan

author: KIKi
author_rank: Newbie
timestamp: July 23, 2019, 11:06:24 am
content: You could try Refondhttp://www.refond.com/

author: alanambrose
author_rank: Frequent Contributor
timestamp: July 30, 2019, 09:01:04 am
content: FYI for anyone else coming across this thread / searching for similar parts: Ushio has off-the-shelf some multi-IR LEDs and also a custom build service e.g.http://www.ushio-optosemi.com/en/products/led/std/multi/smt_family.htmlandhttp://www.ushio-optosemi.com/en/products/led/std/multi/cma_family.html

author: alanambrose
author_rank: Frequent Contributor
timestamp: July 30, 2019, 10:55:38 am
content: Also any leads on custom LED manufacturers / dies / bonding in relatively small quantities (say 100K units) would be great. Similarly, Asian-based reps who can search the Chinese market and custom manufacturers (e.g. Everlight, Lite-On, HARVATEK, OptoSupply, Meihua, Tonyu, Ekinglux, Oweis Lighting).TIA, Alan

author: Zero999
author_rank: Super Contributor
timestamp: July 30, 2019, 03:23:27 pm
content: I've just had a quick search through Digikey850nm seems to be fairly common in 0603https://www.digikey.co.uk/product-detail/en/everlight-electronics-co-ltd/HIR19-21C-L11-TR8/1080-1347-2-ND/2675838740nm is much less common. I've managed to find one in the larger 1206 package but it isn't cheap.https://www.digikey.co.uk/products/en/optoelectronics/infrared-uv-visible-emitters/94?k=&pkeyword=&sv=0&pv40=676&sf=1&FV=ffe0005e%2C402df0%2C400505%2C4037fa%2C4042a7%2C4043fb%2C40465a%2C400dae%2C400007%2C400008&quantity=&ColumnSort=0&page=1&pageSize=25

author: jmelson
author_rank: Super Contributor
timestamp: July 30, 2019, 06:47:09 pm
content: Quote from: Zero999 on July 30, 2019, 03:23:27 pmOff the shelf is going to be WAY cheaper than having a custom semiconductor fabricated to your spec!Jon
Custom PC front panel with USB - Page 1
Forum section: electronics / projects

author: katylemon
author_rank: Newbie
timestamp: January 09, 2022, 01:26:22 pm
content: Hi all,I want to design a custom front panel for my server, with some status LEDs, buttons, serial connector and USB ports.On inspecting some front panels from standard PC cases I found, that those have some inductances and/or resistors integrated into the USB signal path on the pcb.Unfortunately, I could not find any publicly availabel sample schematics.Can anyone give me some advise, what components/values shall be used?Greetings,katylemon.
Custom Query in Altium Rule - Page 1
Forum section: electronics / projects

author: SwissEngineer
author_rank: Contributor
timestamp: February 29, 2016, 11:01:35 am
content: Hey all,I'm kinda new with the altium rules query, and I am trying to make a rule that's says:Allow Shortcircuit only for GND net and GNDA net, but refuse for all others.Thanks

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 29, 2016, 11:32:35 am
content: The correct way to do this is probably the "NetTie" feature. Might wanna look into that

author: SwissEngineer
author_rank: Contributor
timestamp: February 29, 2016, 11:58:52 am
content: I know what you mean. But my question is how to allow Shortcircuits when I am routing the GND netorthe GNDA for exemple to make ground rings around pads and traces.But if allow any court-circuits, then I could have problems with other signal nets.

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 29, 2016, 12:22:48 pm
content: - Make a new short-circuit rule- Make a custom query where it now says 'all nets' for GND- For the other entry select GNDA- Tick the "allow short circuit" box.

author: SwissEngineer
author_rank: Contributor
timestamp: February 29, 2016, 12:44:30 pm
content: Thanks!
Custom receiver (1Wmax) for SENCOR Wireless Charger 5Wmax - Page 1
Forum section: electronics / projects

author: szan
author_rank: Regular Contributor
timestamp: September 17, 2022, 01:10:15 pm
content: Hello,I have such SENCOR Wireless Charger 5Wmax powered by 5V USB.I'd like to have custom receiver to harvest energy (1Wmax) from this thing and charge other stuff which has 5V USB input but I haven't got receiver capable to work with this wireless chargerMaybe someone have some ideas or designs how wireless charging capable mobile phones harvest energy from such chargersEfficiency is not a problem since this charger will be connected to photovoltaic solar panel

author: szan
author_rank: Regular Contributor
timestamp: September 17, 2022, 01:23:33 pm
content: OK,meanwhile I found wireless receiver with type-C usb connector which could work with my Motorola mobile phone, but it has at the bottom also NFC connection, so unsure if it will not interfere somehow?Anyway, it could be fun to build custom wireless receiver to power some stuff

author: szan
author_rank: Regular Contributor
timestamp: September 17, 2022, 01:45:20 pm
content: Thanks to this Wireless Charging Coil Design PDFhttps://www.wirelesschargingcoil.com/wp-content/uploads/2018/09/WPC-wireless-receiver-coil-Module-JH-H10-R-C2-S.pdfnow we have some idea howto build receiver coildLets add some fast diodes and power capacitor with connected LED and see what happends when we'll move this receiver closer to Qi charger
Custom Resistor Network/Array? - Page 1
Forum section: electronics / projects

author: arexr135
author_rank: Newbie
timestamp: January 19, 2022, 12:39:51 am
content: Hello!I am redesigning a circuit that was originally used to cycle the glow plugs on a diesel motor.But I've ran into a bit of a hiccupThere is an SIP-7 Resistor Network that appears to be custom, I was wondering if anyone has any more information on where I could get something like it!The dimensions of the network are:18mm W x 7mm H (without pins) x 1.3mm DI need to find a suitable replacement for it, the pins areevenly spaced 2.5mm apartfrom each other.I've done testing on it and have included a crude schematic below:The measurements were performed out of the original circuit!Any information about how I can go about getting something as a suitable replacement would help!

author: retiredfeline
author_rank: Frequent Contributor
timestamp: January 19, 2022, 12:45:32 am
content: Are those measurements in-circuit? Better to measure out of circuit. Are you sure it isn't a standard 10k SIP7 network?

author: arexr135
author_rank: Newbie
timestamp: January 19, 2022, 12:46:22 am
content: The measurements are out of circuit! Good call!

author: retiredfeline
author_rank: Frequent Contributor
timestamp: January 19, 2022, 01:05:07 am
content: But those resistances between pairs of pins out of 2-7 don't make sense. They should be the sum of the resistances to 1.One possibility to consider is that the common pin isn't 1. I've come across networks where the common pin is the middle pin. Can you take a picture? Is there a dot near pin 1 or the middle pin?

author: CaptDon
author_rank: Super Contributor
timestamp: January 19, 2022, 01:10:36 am
content: Those measurements don't work out at all.

author: arexr135
author_rank: Newbie
timestamp: January 19, 2022, 01:19:31 am
content: Yes there is a dot above the first pin!From what I've researched its a T1794 Resistor array, here is a link to the catalogue:http://www.caddock.com/Online_catalog/Mrktg_Lit/TypeT1794.pdfThe markings have wore off from me constantly checking the measurements but it originally stated T1794-237-2

author: arexr135
author_rank: Newbie
timestamp: January 19, 2022, 01:44:29 am
content: I was able to use an incredibly bright LED to give me a silhouette of the internals through the semi-translucent ceramic.I crudely sketched what I was able to see internally.
Custom T12 firmware benefits - Page 1
Forum section: electronics / projects

author: Ryszard
author_rank: Newbie
timestamp: April 13, 2023, 09:05:19 pm
content: Hi,I don't have T12 yet, but it's being delivered. Since there is no info about it, what are the benefits of installing this custom firmware? What does it do that the default one doesn't?https://github.com/deividAlfa/stm32_soldering_iron_controller

author: tatel
author_rank: Frequent Contributor
timestamp: April 14, 2023, 12:10:10 pm
content: I think this post has the answers you are looking for:https://www.eevblog.com/forum/reviews/soldering-station-purchase-advice/msg4612993/#msg4612993Your post is misplaced, it should go into the "Other Equipment & Products", here's the relevant thread:https://www.eevblog.com/forum/reviews/stm32-oled-digital-soldering-station-for-t12-handle/
Custom USB 7 port hub PCB dasiy-chain - Page 1
Forum section: electronics / projects

author: Stealthrt
author_rank: Regular Contributor
timestamp: October 15, 2014, 12:34:39 am
content: Hey all I had a schematic laid out for a custom USB 2.0 7 port hub I needed to create for a project of mine. It currently uses Ethernet RJ45 sockets to provide power and data to each hub (2 Ethernet ports for upstream and downstream USB) along with the needed resisters/regulators (to drop it down to 5vdc/3.3vdc)/etc.Though I have an issue and that's why I wanted to post on this forum and see if it can be taken care of before I send the Eagle & gerber files to the company to get printed and populated.The usb hub chip I am using is the microchip USB2517 [http://www.microchip.com/wwwproducts/Devices.aspx?product=USB2517]. And the datasheet is here [http://ww1.microchip.com/downloads/en/DeviceDoc/2517.pdf]Would it be possible, running a power supply of 12vdc 160W 10a [http://www.12vadapters.com/adapter/power-supply/12v/10-amp-10a.html], to power the hubs? Keep in mind not all of the 6 USB ports will be used per the 12 or so hubs I will have daisy chained. I would guess that 18 to 35 usb ports out of a possible 72 usb ports will be used. If it'snotpossible then what would need to be in place for that to happen?

author: Monkeh
author_rank: Super Contributor
timestamp: October 15, 2014, 01:49:36 am
content: Of course it's possible to use such a supply, you just need to use switching regulators to drop the voltage.These are layout sensitive, as is USB.8P8Cs will not take much current, how much power are you planning to send down them?

author: ajb
author_rank: Super Contributor
timestamp: October 15, 2014, 02:43:16 am
content: You'll want to examine the voltage drop across the length of the daisy chain, taking into account your expected hub-to-hub cable length. You may wind up better off using a higher voltage for distribution.
CustomPCB [Silver Circuits] Setup Fees - Page 1
Forum section: electronics / projects

author: sentry7
author_rank: Regular Contributor
timestamp: February 19, 2016, 10:48:57 pm
content: Hey guys,So I'm looking at CustomPCB's services and theirProductionsetup fee starts out at around $75-$100. Suppose I initially order a batch of 25 boards using this service. If I needed to reorder a batch of the same board, do I have to pay this setup fee again?CustomPCB -http://www.custompcb.com/index.php

author: Paul Price
author_rank: Super Contributor
timestamp: February 19, 2016, 10:51:17 pm
content: Probably not..don't ask us..ask them!

author: Paul Price
author_rank: Super Contributor
timestamp: February 19, 2016, 11:21:03 pm
content: Although not always the case, experience with your circuit leads to production runs that are modified as to circuit and component and layout changes, and in this case, the setup will need to be setup again..but ask them..not us!