hybridfree/eevblog-posts huggingface dataset:
Looking for something like a MAX40200 in a SOT-23 case - Page 1
Forum section: electronics / projects

author: perdrix
author_rank: Frequent Contributor
timestamp: February 22, 2018, 11:19:18 am
content: The MAX40200 ideal diode current switch looks almost ideal for a problem I wish to solve, but (there's always a but) what I'm looking for would have two of them configured in a SOT-23 format just like the BAT54C which I'm looking to replace in a dual supply steering application without changing the PCB.https://www.maximintegrated.com/en/products/analog/amplifiers/MAX40200.htmlDoes anyone know of a product like that?ThanksDavid

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 22, 2018, 03:16:44 pm
content: So-called ideal diodes usually need a reference potential (GND), so I doubt you can find a dual ideal diode in a 3-pin package.One option would be to design a small adapter (provided that you can have access to GND nearby and that there is enough available space on your board).If a 2.5V to 5.5V operating range fits your requirements, the LTC4413 could be a match. You'd still need an adapter.

author: perdrix
author_rank: Frequent Contributor
timestamp: February 22, 2018, 04:41:36 pm
content: Thank you,I just hate those DFN surface mount ICs. The LTC4411http://www.linear.com/product/LTC4411might fit the bill with some extra components.I wish they made the 4413 in a SOT type package, as I'm sure I could find a ground nearby.Does anyone else have any suggestion.Dave
Looking for source for cheap LEDs - Page 1
Forum section: electronics / projects

author: Cloud
author_rank: Regular Contributor
timestamp: March 28, 2016, 05:42:25 pm
content: I am a little LED freak and I am looking for a source of cheap LEDs for smaller quantyes. I am mostly interested in 5050 RGBs and white LEDs.

author: TerraHertz
author_rank: Super Contributor
timestamp: March 29, 2016, 02:17:12 am
content: Have you looked athttp://www.aliexpress.com/?I don't know what the postage would be to Slovenia, but for Australia most Aliexpress sellers have free postage.

author: mariush
author_rank: Super Contributor
timestamp: March 29, 2016, 03:05:00 am
content: Before wasting time with orders from China (and 3-4 weeks delivery times) and customs fees and whatever, check TME.eu , an European distributor .. here's some 5050 leds they stock :http://goo.gl/1jeB1pIt's sorted by cheapest price for large quantities, i see for example a 5050 white led there for $0.0663 if you order 100. Of course, the shipping would probably be about 5 euro.
looking for special handheld case - Page 1
Forum section: electronics / projects

author: konfu
author_rank: Contributor
timestamp: April 04, 2013, 08:04:04 pm
content: Hi folks,I am designing a small gps tracker with wireless location transmission to a receiver. Therefore I am now looking for a nice case.I need a case that is as rugged as possible while being small and allow for one or two AA batteries to be put in. The device should be worn at a jacked or belt so there is some "Line of sight" to the sky for GPS signals to pass. Just like a walkie-talkie, pager, mobile phone or similar.Ideally I am looking for something like a pager case that is some kind of waterproof so that rain won't kill the device. It doesn't need to survive a bath or so. The device needs to be made of plastic as I will place a GPS receiver inside. some small antenna will be placed outside the case using a RP-SMA connectors or so.So my requirements:- small- 1 or 2 AA batteries- waterproof or water-resistant- rugged- made of plastic- size: width and heigth of an AA battery I don't need much parts on the PCB- no need for a display, maybe just a small LED and maybe an on/off switch or momentary switch for latching- place to drill a hole for a RP-SMA antenna connector- should be available inside the EU in smaller quantities (sub 100 units)- nice look. Shouldn't be a grey squared plastic box. Should be some kind of "fancy/technical" looking like the picture below. ;-)For my prototype I used this casePactec PPL-2AA. But it's too big, not really comfortable with water and just looks ugly. ;-)Basically I am looking for a case like this:I am open for any suggestions.

author: free_electron
author_rank: Super Contributor
timestamp: April 04, 2013, 09:04:47 pm
content: BOX enclosures (no joke. there is a brand called BOX )Hammond
Looking for stacked / dual SMA PCB connectors... - Page 1
Forum section: electronics / projects

author: nctnico
author_rank: Super Contributor
timestamp: March 08, 2024, 12:56:20 am
content: I'm doing some initial research into a new project where I have limited space. What would help me is if I can use a stacked SMA connector like this:This one is from CEI but I'm wondering if there are other manufacturers offering something similar. Preferably interchangeable. I'd hate to have to rely on a single source.

author: uer166
author_rank: Super Contributor
timestamp: March 08, 2024, 01:53:20 am
content: Can you make a small vertical interposer board that solders into the main board? Then can put in 2 standard SMA connectors on interposer.

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: March 08, 2024, 05:40:57 am
content: Or use a U.FL board-mount, and a short U.FL to SMA(f) cable, those are cheaply available. MMCX is another alternative to U.FL.

author: nctnico
author_rank: Super Contributor
timestamp: March 08, 2024, 10:38:59 am
content: An extra board or using pigtails is an option I consider. But I'd like to avoid needing extra boards or cables if I can to make manufacturing simpler.
Looking for suggestions on thermal design for Orange Pi case. - Page 1
Forum section: electronics / projects

author: vgamesx2
author_rank: Regular Contributor
timestamp: June 14, 2017, 03:11:21 pm
content: Alright so a while back I went and bought an orange pi one and decided I'd make my own enclosure for it, I've just now got around to it and I found an almost perfectly sized box for it from one of those cheap solar charge controllers.Now, it has a very small heatsink and I also have a mini 5V fan for it and I want to know what the best way to configure it is? I was thinking something like this (see picture below) with the top of the board being an intake and the fan being an exhaust, is that suitable?I can also just barely squeeze the fan in sideways.
Looking for switching regulator with serial control - Page 1
Forum section: electronics / projects

author: bill_c
author_rank: Regular Contributor
timestamp: January 15, 2020, 04:10:20 am
content: My first post here!I am looking for a switching regulator or controller that I can connect to a micro via SPI or similar to drive a proportional hydraulic valve (36W solenoid).Regulating current instead of voltage would be better since the coil resistance changes with temperature.Rated input needs to be above 24V, output needs to be 24V or more and 1.5A or more.I will be constantly changing the setpoint so faster response and serial coms are better. 8 bit setpoint minimum.Anyone know of a suitable part?Or would I be better off using an analog out from the micro to offset the feedback to a standard switching regulator?I tried PWM with a MOSFET which did function, but it lacks regulation and the 20+ feet of wire would make a fair bit of noise.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 15, 2020, 05:25:26 am
content: How about a serial DAC like MCP4921, followed by a power op-amp, or tweaking the feedback pin of a linear or switching regulator?1.5A may be a bit above the range of most LED/backlight drivers, but that comes to mind as a product line that's tailored around supplying constant current. Some are continuously dimmable (rather than PWM gated), or you can do the "tease the feedback" trick all the same.Also consider normal regulators, the ones with current mode operation, and a transconductance error amp, with external compensation. These, the COMP pin voltage corresponds to output current, so just overdrive that directly. Mind, there's usually peak detection and slope compensation involved, which mean the setpoint will not correspond to current exactly, and you may want an old fashioned current sense resistor (maybe with a sense amp) and error amp to get an accurate response.Or you can use a regular regulator in a low-side-sense current feedback configuration, which drops VREF across the sense resistor. Which sounds annoying, but bear with me. If VREF is 1.24V say, that's kind of a lot (several watts at 1.5A), but you could use an amplifier to boost the signal, so that only say 124mV is needed (10x amp). Preferably, you can find a regulator with a lower VREF; 0.8V is pretty common (0.8V * 1.5A = 1.2W). Not sure if you can find lower.Tim

author: Giaime
author_rank: Regular Contributor
timestamp: January 15, 2020, 12:55:30 pm
content: You might take a look to Ti's TPS92518.

author: bill_c
author_rank: Regular Contributor
timestamp: January 16, 2020, 01:30:38 am
content: That TPS92518 looks like it just might work, going to give it a try.
Looking for the datasheet of this TVS diode - Page 1
Forum section: electronics / projects

author: XaviPacheco
author_rank: Regular Contributor
timestamp: June 29, 2018, 08:42:39 pm
content: Hi,I'm looking for the datasheet of a SMD TVS diode which mark code says: KE09A. No success sor far. I've seen many KE TVS diodes, but can't find the specific one KE09A. Any suggestion to improve the searching?
Looking for the operations manual for a Kingshill 15A1C Power supply - Page 1
Forum section: electronics / projects

author: MattGC
author_rank: Newbie
timestamp: November 26, 2018, 02:05:58 pm
content: I've got a kingshill 15A1C power supply but no manuals on how to operate it. Google doesn't come up with anything on this device except for calibration centres.I'm looking at current controlling this device using another source. I do not know how I should set this up, given the various inputs, or what I should supply, including limits so that I don't damage it.Kingshill Power supply:

author: Andy Watson
author_rank: Super Contributor
timestamp: November 26, 2018, 03:29:47 pm
content: You might be out of luck finding the exact manual. Try seraching for similar models.Like the two similar models in this posting:https://www.vintage-radio.net/forum/showthread.php?t=100162Looks like "V series" should help your search. Also, try a different search engine - google has a tendency to form a search bubble which is not helpful if your initial search fails.
Looking for the proper name for epoxy-ink printing machines - Page 1
Forum section: electronics / projects

author: XFDDesign
author_rank: Frequent Contributor
timestamp: June 06, 2016, 03:50:30 pm
content: A long, long time ago, a small business I worked at used this interesting epoxy printing system for getting part numbers marked onto sensor housings (plastic, aluminum, etc).I'm making an instrument that goes into a Hammond 1598J case, and specifically need to mark the front and rear panels. I started to look for what I thought would make sense: "Epoxy ink printer" but this was apparently not the correct phase. I have tried a few other routes, but to no avail.I'm curious if anyone here might actually know what the apparatuses are called? Essentially it has an etching with the printed artwork (mirrored), you drop some mixed epoxy ink on it, squeegee the excess away, and bring down this "rubber nipple" that takes on the ink. Drop in the target device to get printed on, and the ink transfers.If those systems went away, what is their replacement? I'd like to stay away from the "sticker" solutions in favor of items which are a bit more robust and don't peel off with age.Thanks!

author: ovnr
author_rank: Frequent Contributor
timestamp: June 06, 2016, 04:13:27 pm
content: Sounds like you're thinking ofpad printing?If you're just marking a flat panel, silk screening is a more appropriate process.

author: XFDDesign
author_rank: Frequent Contributor
timestamp: June 06, 2016, 04:26:48 pm
content: That would be it. Thanks! I'll give the silk-screen printing a look too.

author: Pjotr
author_rank: Frequent Contributor
timestamp: June 06, 2016, 07:03:12 pm
content: Silk screen printing is good for large quantities. For small quantities jet printing is more common. However for both mostly UV curing ink is used. I noticed that the silk on my last batches of PCB's from China were fine dot printed, not photo laminated as usual.For small quantities face plates, contact specialized companies. Most do prototyping on mylar film at reasonable cost.If you want one for yourself search for UV inkjet printer. Small ones start at $3000
Looking for this 4v LDO Specs, Any tip - Page 1
Forum section: electronics / projects

author: ebclr
author_rank: Super Contributor
timestamp: May 08, 2020, 06:02:47 am
content: Mark 85034030SOT 223-3It's a 4V LDOAnyone know what exactly is this IC spec.https://ibb.co/xhgJW4V
Looking for this SMA Connector - Page 1
Forum section: electronics / projects

author: Samspec
author_rank: Newbie
timestamp: March 10, 2016, 02:55:05 am
content: Hello all,I have these Harris Corp GPS Antennas that use special SMA connectors. Harris says they will sell me the whole setup (Gps puck with cable) as a unit, they will not just sell the cable. The price is considerably higher than the price of a 50 dollar connector. Trying to save the shop money. SMA Female, Crimp, Thread-in.The first picture is a side view of the SMA, short thread length, you can kind of see that inner dielectric is not all the way to the sides, you can see this better on the second picture, which is a top view. The third picture is the GPS puck where the connector goes. I tried looking at every website that sells SMAs but can't see the center dielectric to match to what I need. Hoping any of you have seen this and ordered one before.

author: Samspec
author_rank: Newbie
timestamp: March 10, 2016, 03:12:43 am
content: 3rd pic, sorry couldn't put with the others, file is too big.

author: Stray Electron
author_rank: Super Contributor
timestamp: March 10, 2016, 03:16:31 am
content: Which half do you need and how many? New or used? I frequent a surplus place that's only a few miles from the Harris plant in Palm Bay and I've seen those in their E-scrap.

author: Samspec
author_rank: Newbie
timestamp: March 10, 2016, 03:22:05 am
content: Looking for 2 Female connectors, new, pic 1 and 2.Thank you for your help.

author: ConKbot
author_rank: Super Contributor
timestamp: March 10, 2016, 07:02:35 am
content: Looks like it might be a SMB or MCX connector, if it is, it shouldn't be too hard to find a connector or prepare adapter cable. Is it a push connect not threaded? Both of those are push on type connectors.

author: Stray Electron
author_rank: Super Contributor
timestamp: March 11, 2016, 08:40:51 pm
content: These aren't SMA or SMB connectors. The first two photos look like an SMB plug. I'll look in my small cables pile but I doubt that I have any new connectors only but I may have a cable or the end of a cable with one on it. Where are you at OP?Check out these photos. <https://www.google.com/search?q=smc+connectors&client=firefox-beta&rls=org.mozilla:en-US:official&channel=fflb&biw=1152&bih=738&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjDo5eqvLnLAhVJOCYKHSIbAWAQsAQIcA#imgrc=_>

author: TimFox
author_rank: Super Contributor
timestamp: March 11, 2016, 09:09:41 pm
content: SMA and SMC connectors have a threaded coupling. SMB connectors use a snap coupling.

author: dom0
author_rank: Super Contributor
timestamp: March 11, 2016, 10:53:27 pm
content: Looks like MCX to me, too. They are common on older/ expensive GPS gear.

author: xygor
author_rank: Regular Contributor
timestamp: March 11, 2016, 11:25:12 pm
content: This may be helpful to ID the connector.http://www.pasternack.com/images/pdf/7%20connector%20identifier.pdf

author: ywara
author_rank: Contributor
timestamp: March 12, 2016, 08:49:22 pm
content: Sure looks like MCX.You will want to know the cable type you are terminating and look for a rear-mount bulkhead jack.
looking for tips about ground chassis gard ring and insulation to electrical GND - Page 1
Forum section: electronics / projects

author: chipeater
author_rank: Contributor
timestamp: October 23, 2023, 04:48:44 pm
content: Hello,I need to design a board with a gard ring connected to chassis GND. Its decoupled by 1kV 4.7nF capacitor.Do you know the name of the standard that allows me to find the insulation distance between the GND chassis and the electrical GND plane ?Or a calculator or a guide that allows me to define this ?Thank you very much

author: jonpaul
author_rank: Super Contributor
timestamp: October 24, 2023, 08:01:52 am
content: Whats the expected voltages/resistances in the design, eg a 24V SELV or 240V mains SMPS? ohms/gigohms/teraohms?Guard is usually for a low current instrument eg insulation meter, electrometer, capacitance bridge.Exactly what is the device application, environment, area of expected sale (EU/UK/USA/Asia/worldwide)AmicalmentJon
Looking for tips for ESP32 quality of life suggetions schematic/layout - Page 1
Forum section: electronics / projects

author: rsee
author_rank: Contributor
timestamp: September 09, 2025, 06:41:18 pm
content: Hi all,I’ve been pretty excited about Home Assistant for about a year now and have been thinking about cutting my teeth on an esp32 project schematic/layout and working through making it work with ESPHome. I’m currently leaning toward an air quality monitor for PMS5003, CO2 with SenseAIr, and probably temp/humidity to round it out TBD.Anyway, I’m looking for suggestions beyond what is on the Espressif website for technical considerations. Like what do you think is helpful?PowerShould I be able to plug this into the wall? Only run from battery? LiPoly? Coin cell to make it smaller. Personally I like the idea of using lipoly, with USB 3.1 and a battery manager.Network ConnectivityPreferred network type? Most of my network is zigbee but all but three of my 15 devices are offline and trying to triage that so I’m thinking I might just try to do something more like matter/thread or wifi/mqtt. I like the idea of the ESP32 because of the options it provides though.ESP32 VarietiesI’m also curious what you all think about the different varieties of ESP32s.Size/ConnectorsShould I go as small as practical. (Maybe not as small as BGA yet ... I don't trust a home setup for reflow and I'm a bigger blob better job kind of solder skill level). Preference for connector types? Terminal blocks, 0.1" headers, throughhole + solder, something that needs to be crimped seems like too much work but let me know if you feel otherwise.If you have any suggestions in general I’m all ears. Just looking for any sage advice!ThanksRyan

author: TimothyEngler
author_rank: Newbie
timestamp: September 15, 2025, 10:25:31 am
content: Consider USB/LiPo power with a battery manager, Wi-Fi/MQTT for connectivity, standard ESP32 DevKit for ease, 0.1" headers for simplicity, and compact but solder-friendly layout for reliable, flexible home projects.
Looking for Xantrex Trace Mariner 3012 service manual - Page 1
Forum section: electronics / projects

author: bilko
author_rank: Frequent Contributor
timestamp: January 04, 2013, 09:41:43 pm
content: Anybody come across a source for the above service manual ?The unit is a charger / inverter. It just stopped working.Manufactured by Trace Engineering around 10 years ago, company was taken over by Xantrex.Tried Xantrex but they won't release schematics or service manualsUser manual ishttp://www.xantrex.com/documents/Discontinued-Products/3506MarinerSeriesII.pdfbut is useless for fault finding.Any help will be very much appreciated

author: bilko
author_rank: Frequent Contributor
timestamp: January 08, 2013, 08:34:04 pm
content: After a little tinkering, managed to get the unit powered up.Flashes 3 whole flashes and a sort of half flash.The manual suggests it should be referred to an authorised dealer for repairXantrex just not interested at all, and still no service manual.These odd type faults are often a sign of BADCAPS, so that's my next task, changing them all.One thing for certain, with the support I get from Xantrex being NON EXISTENT, they are well and truly on my blacklist.Still, anybody know where I can get a service manual ?
Looking for unusual formfactor LED's for Amiga 1200 LED PCB - need help - Page 1
Forum section: electronics / projects

author: CJWarlock
author_rank: Contributor
timestamp: January 07, 2014, 04:45:50 am
content: I'm looking foranunusual formfactor LED'sthat were used inAmiga 1200(a retro computer - for those unfamiliar with it) on itsLED PCB(indicating power on, FDD, HDD). Dimensions and pictures below. Please help. I've spent several hours through several days trying different search phrases and still couldn't spot such LED's. I need them to be very similar in width and depth. Other parameters including number of LED structures inside may vary.I have some empty A1200 cases and wanted to fit them with LED modules (made my myself) as much similiar to the original one as possible. I've decided to ask more experienced forum users - maybe some of you know about a source of just such diodes. If so - let me know. I believe such LED's were still available in the 90's but nowadays - who knows.Amiga 1200 LED'swidth: 14,6 mmlength: 1,8 mm upper part, 2,8 mm baseheight: 7,8 mm total (upper part + base), 4,9 mm upper part (2,9 base)LED structures in one case: 2 pcs.distance between two most middle one pins: 5,6 mmraster: 2,54 mm* by "base" and "upper part" I mean the visibly bolder and thinner parts of the LED's case.

author: Rerouter
author_rank: Super Contributor
timestamp: January 07, 2014, 05:34:25 am
content: my best reccomendation would be to buy 3mm leds in the colour you want, and drill out 3mm holes in a correct thickness piece of acrylic,

author: CJWarlock
author_rank: Contributor
timestamp: January 07, 2014, 06:34:22 am
content: Quote from: Rerouter on January 07, 2014, 05:34:25 amThat actually could be a good backup idea. Thanks. I'll later consider if and how exactly it is possible to make.

author: Zad
author_rank: Super Contributor
timestamp: January 07, 2014, 06:36:40 am
content: Make a mould out of one you already have, and use casting resin around 2 standard LEDs.

author: Moshly
author_rank: Regular Contributor
timestamp: January 07, 2014, 07:36:50 am
content: Hi, how may do you need ?You could try sending an email tohttp://www.amigakit.com/orhttp://www.vesalia.de/If its not many, try asking onhttp://eab.abime.net/If you need lots, then askhttp://www.jschoenfeld.com/home/indexe.htmhe may at least know a supplier.Hope that helps

author: CJWarlock
author_rank: Contributor
timestamp: January 12, 2014, 04:36:03 am
content: Thanks to everyone who replied. I think the idea with drilling the acrylic blocks and inserting small LED's was the easiest as I don't have any experience in (and tools needed for) resin molding. However the dual-thickness case (1,8 and 2,8 mm - like in the original LED's) may be hard to reproduce and choosing the lower one may cause a problem with drilling/cutting holes and fitting the regular LED's (1.8 mm, 2 mm or 3 mm). I was really hoping someone here i.e. browsed through some LED offers recently and may saw some supplier who still offers such unusual LED's. Thanks anyway.I guess it's up to my creativity now to find a solution. I have some ideas already.
Looking for User Manual / Service Manual for MLA UPS - Page 1
Forum section: electronics / projects

author: kolbep
author_rank: Frequent Contributor
timestamp: June 19, 2015, 08:57:49 pm
content: Good Day.I have an MLA POWER SYSTEMS M 6000 UPS/Inverterit is a 6KVA 230v Single Phase, 16 x 12v Batteries.I am having trouble finding any more info on the UPS (to start, I just want a user manual for it)Attached is an image of the Control Panel of the UPS.If anybody knows of anything similar, or maybe has a manual for a similar type of UPS, I would be grateful.Thank YouPeter

author: kokololo
author_rank: Newbie
timestamp: March 03, 2019, 10:10:05 am
content: Good Day PeterI too have MLA POWER SYSTEMS equipment from the early 90's (1992?)It is an M1000 UPS/Inverter 1KVA 230V Single Phase, 9 x 12v Batteries and still going strong after all the years.I found a guy who services these units and might be able to help with information. Interested? I can email his contact information.

author: kolbep
author_rank: Frequent Contributor
timestamp: March 06, 2019, 05:46:26 am
content: I am good thanks.The unit was Corroded and beyond economical repair.
Looking for vac pump info, Edmunds & Fisher C-Plus - Page 1
Forum section: electronics / projects

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: June 23, 2018, 08:54:30 pm
content: This is a group of varied interests so maybe somebody can help me. I've got an old belt-drive Edmunds ES100 vacuum pump. I think it's single stage, but not sure. The jokers didn't change their part numbers when they went to direct drive pumps, so finding anything is hard because only the new stuff comes up. Does anybody have any literature or manuals for the older belt drive pumps? RPM and oil type would be useful.I've also got a cute little Fisher Scientific Maxima C-plus pump, model M4C. Again, no literature at all. I do have the generic brochure. Anybody have anything stashed away in a file cabinet or a pdf?Thanks
Looking for very old AD and Union Carbide OP-AMP Datasheets - Page 1
Forum section: electronics / projects

author: marcopolo
author_rank: Regular Contributor
timestamp: October 15, 2022, 02:17:20 pm
content: Hello,Do any of you have any documentation on these circuits?Thanks,Marc

author: Terry Bites
author_rank: Super Contributor
timestamp: October 15, 2022, 04:27:53 pm
content: I'd contact AD. They keep great archives.I'm sure they'd be proud to help you.

author: TimFox
author_rank: Super Contributor
timestamp: October 15, 2022, 07:18:17 pm
content: I have fond memories from grad school of the old Analog Devices modular op amps, including the 108, 118, and 52.Back in the 1970s, we did an experiment to see how robust the modules were against a spark to the output, for use in regulated HV supplies. As you can imagine, they far outlasted the 741 monolithic devices.I was surprised how hard is to find the data sheets on Google, which is not helped by the confusion with monolithic 108, 118, etc. devices.

author: magic
author_rank: Super Contributor
timestamp: October 16, 2022, 07:09:02 am
content: It's notthatsurprisingThe oldest AD databook scan I found on Bitsavers is 1980 and it lists the 108 as obsolete already. 52 was the recommended replacement.I don't see anything on 1115It's not impossible that those datasheets have simply never appeared online.

author: marcopolo
author_rank: Regular Contributor
timestamp: October 16, 2022, 12:14:05 pm
content: Quote from: magic on October 16, 2022, 07:09:02 amThat's why I posted a request here, hoping that one of you would have some very old AD or Union Carbide databooksI have the same problem with TI TMS4125 and TMS4126 (perhaps mask ROM)My friend have all ref from TMS4119 to TMS4126https://www.eevblog.com/forum/chat/looking-for-tms4125-tms4126datasheet/

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: October 16, 2022, 03:43:14 pm
content: My dad worked for Union Carbide his entire career and is into electronics. He wasn't aware they made opamps at all. He did mention that they owned Raytheon for a while.
Looking for vibration motor with industrial grade - Page 1
Forum section: electronics / projects

author: muthukural001
author_rank: Regular Contributor
timestamp: April 15, 2020, 09:54:50 am
content: Hello,I am searching for a mini vibration motor with industrial grade. All the motors that I am seeing is within -20C to 70C range. If anyone have come across the industrial grade mini vibration motor, please share.Thanks

author: beanflying
author_rank: Super Contributor
timestamp: April 15, 2020, 10:07:54 am
content: 'Industrial Grade' is not remotely near defining what you actually want or need it to do and what sort of environment you 'need' it to work in?Vibrating mechanisms/motors of all sorts are used for mixing or separating tasks in industry for example but will generally be designed as needed to do the job required rather than an off the shelf mechanism.

author: muthukural001
author_rank: Regular Contributor
timestamp: April 15, 2020, 11:09:40 am
content: It is just to validate it on the PCB board.But, we are expecting that it's operating temperature range should be-40C to 85C
Looking for Video Transcoding ASIC or FPGA Solution - Page 1
Forum section: electronics / projects

author: erwets
author_rank: Contributor
timestamp: March 24, 2023, 05:57:16 pm
content: This is a bit of a shot in the dark, but I'm trying to find a cheap (with volume) ASIC or FPGA solution that will enable me to live transcode incoming H264 streams from 1080p HD (with whatever large professional constant/variable bitrate) to some degraded stream (e.g. 720p 10fps 50kb/s). The goal is to simultaneously transcode as many live streams as possible to reduce the original feed to some degraded stream without a huge loss in perceived quality.Does anyone have any ideas for good programmable or ready made silicon for this sort of task? I have to assume these Chinese cameras/drones/etc... have something driving them to produce these live video streams. Presumably I can stack things together to produce to the concurrency I'm after, but I'm having trouble finding components to kick of my search.If anyone knows of an off the shelf solution which is <= ~$500 USD, that would be super helpful as well.I'm in the ideation phase of my project, so happy to provide more details if anyone has an idea of where I should start poking around.

author: rhb
author_rank: Super Contributor
timestamp: March 24, 2023, 06:13:22 pm
content: It's unfortunately twice your stated budget, but an Ultrazed EV includes the decoder/encoder and a very powerful FPGA centric SoC. It's also intended to be used as the base platform for commercial products. Put the bespoke stuff on a daughter board while the dev board is used for initial development. All the interface HW is on the SoM.Have Fun!Reg

author: Marco
author_rank: Super Contributor
timestamp: March 24, 2023, 08:56:22 pm
content: Not exactly ASICs, but do you really have the volume to compete with Jetson TX2 or Netint T408? They are comfortably in your price range if 4 streams are enough.
Looking for wireless camera and monitor options.  Thoughts?   - Page 1
Forum section: electronics / projects

author: viper
author_rank: Regular Contributor
timestamp: February 22, 2022, 08:51:43 pm
content: So, we have several pieces of equipment that need an extra set of eyes. Excavator, forklifts, etc. I am getting pretty frustrated that I just can't find what I need, or at a decent price.I don't even need extreme resolution, I just need a weather resistant camera mounted out on the machine somewhere, and a sleek monitor near the operator station. Security cams are outdoor cams with all the frills, for very cheap. But getting all this together is getting frustrating.Thoughts on where? Or possible I am not using the right key words to search this stuff.

author: cdev
author_rank: Super Contributor
timestamp: February 23, 2022, 12:23:29 am
content: I bet you could build a cam using a raspberry Pi, camera module and wifi that would beat the commercial options out there by a wide margin. You could even use a RPI zero which costs less.Ive found the cameras to be pretty decent, especially for the price.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: February 23, 2022, 12:34:34 am
content: Go to Amazon and do a search on "wireless backup camera".

author: simplyonline
author_rank: Newbie
timestamp: May 18, 2023, 07:21:18 am
content: I think you should search for 4G Solar Cameras[/urlhttps://simplyonline.com.au/product-tag/4g/] to monitor the equipmetns.That is basically what we sell on our website in Australia , but you can find a similar goods in your location.
Looking forsingle chip USB flash memory device for embedded use - does it exist? - Page 1
Forum section: electronics / projects

author: wb0gaz
author_rank: Frequent Contributor
timestamp: December 16, 2018, 07:39:53 pm
content: My current project design includes an embedded USB hub (Terminus Technology FE1.1s) and I would like to include a small flash memory device on one of the downstream ports of the hub (so when attaching my device to a PC, the PC will first see the hub, then attached to the hub see the USB flash memory as well as other USB peripherals in my design.) No particular integration is needed, just something equivalent to a thumb drive plugged into a USB hub. USB 1.1 or USB 2.0 is preferred (I've got no need for USB 3 in this project.)I began searching for a single-chip USB flash memory device and didn't find anything. I'd like to work at the chip level rather than attaching a USB flash memory module (those do exist) as they are much larger than I have room for.Any recommendations?If not a single-chip solution, suggestion for a multi-chip solution that would accomplish the same thing (with the caveat that this is a home project, so I need package(s) I can solder by hand, such as TSSOP, LQFP, etc.)Thank you for any advice

author: wb0gaz
author_rank: Frequent Contributor
timestamp: December 16, 2018, 08:57:25 pm
content: OK - search for "embedded usb drive module" takes me to this:https://swissbit.com/products/nand-flash-products/usb-products/usb-modules/which is a module (as searched for), but the module appears to have a single LQFP-package IC on it (I can't see the reverse side of the module as shown.)Such a type of chip (as what is on the pictured module) is what I am looking for (I don't want to use a module as this isn't going into a PC, it is going into a PC board itself.)Has anyone run into such a chip or could help me refine my search?Thank you!

author: tsman
author_rank: Frequent Contributor
timestamp: December 17, 2018, 12:09:52 am
content: Quote from: wb0gaz on December 16, 2018, 08:57:25 pmThere are two flash chips are on the bottom of that module. Look at page 10 of 14 onhttp://www.farnell.com/datasheets/2372564.pdf

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 17, 2018, 02:25:06 am
content: I have a few USB drives where the active part is a single chip with pads designed to mate up to the USB connector. Not sure how to find that kind for sale but super compact drives are a good start.

author: wb0gaz
author_rank: Frequent Contributor
timestamp: December 17, 2018, 05:42:58 pm
content: NiHaoMike -Do you know what these devices - single IC usb drive with contacts attached - are called or where to source (I've not seen them offered, but if all else fails they'd be an alternative, if small enough.)Also, can you see identifying marks on the IC of your modules? Such an IC is what I'm looking for, just can't get a toehold in identification/search yet.Thanks!
looking off the shelf dc->50hz  linear amplifier  - Page 1
Forum section: electronics / projects

author: qwaarjet
author_rank: Regular Contributor
timestamp: August 24, 2017, 08:49:27 pm
content: I want to drive an inductive load with an arbitrary waveform with a range of 0-30V with about 2A peak current with a dc to about 50hz. my waveform source cant handle that amount of current so I need some kind of amp. most thing i'm finding are for servo drive drives that are expecting some kind of feedback to function (I want open loop, basically a voltage follower). Hoping for something compact preferably DIN mountable

author: mmagin
author_rank: Frequent Contributor
timestamp: August 25, 2017, 12:04:22 am
content: I think Apex makes power opamps that could do exactly what you want with a minimum of support components.https://www.apexanalog.com/products/matrix_high-current.htmlAlthough depending on your average power dissipation, maybe you could get away with the far-cheaper LM675 or something from LT.I'm not sure about off-the-shelf industrial modules though.

author: Circlotron
author_rank: Super Contributor
timestamp: August 25, 2017, 07:27:51 am
content: http://www.farnell.com/datasheets/2001459.pdf

author: capt bullshot
author_rank: Super Contributor
timestamp: August 25, 2017, 10:29:33 am
content: http://www.kepcopower.com/bop.htm

author: daddylonglegs
author_rank: Contributor
timestamp: August 25, 2017, 01:22:29 pm
content: You can drive the outputs of this bench power supply from BNC inputs (for positive voltages):https://www.rohde-schwarz.com/uk/product/hm8143-productstartpage_63493-43458.htmlhttps://cdn.rohde-schwarz.com/pws/dl_downloads/dl_common_library/dl_manuals/gb_1/h/hm8143_1/5800448602_Handbuch_HM8143_web_20160704.pdfQuoteI use this supply but haven't used the analogue inputs for real work so, if you go down this route, badger a salesperson into lending you one for a few days to test it out with your inductive load. It's expensive, but you'll have nice bench PSU left over at the end of the project.PS You won't fit this on a DIN rail. It's compact - for a bench top supply.

author: qwaarjet
author_rank: Regular Contributor
timestamp: August 25, 2017, 04:25:28 pm
content: Thats a cool alternative to the kepco supplies.

author: Zero999
author_rank: Super Contributor
timestamp: August 25, 2017, 05:42:10 pm
content: Quote from: qwaarjet on August 24, 2017, 08:49:27 pmWhat voltage & current can your waveform source output?As mentioned above, an audio amplifier would most likely do the job, but you may need to adjust the gain to prevent clipping.

author: qwaarjet
author_rank: Regular Contributor
timestamp: August 25, 2017, 06:23:53 pm
content: 10V 20mA

author: ruairi
author_rank: Frequent Contributor
timestamp: August 25, 2017, 06:36:19 pm
content: Do you need actual DC or just sub 1Hz?

author: qwaarjet
author_rank: Regular Contributor
timestamp: August 25, 2017, 07:05:09 pm
content: well I guess 10uHz would technically be ok
Looking sideways at Dave's bench power supply - Page 1
Forum section: electronics / projects

author: asgard
author_rank: Regular Contributor
timestamp: January 03, 2012, 12:13:18 am
content: Well, folks, it's another year. Except at 21 Dec expect, umm... something ... to happen. :-)I have enclosed an Eagle schematic which, I hope, represents the best current look at the bench power supply as presented in EEVBlog 221 to present. This is based upon what my (getting older) eyeballs could discern from the fade-like drawing Dave presented in part 3. It required me to create an LT3080 Eagle library file, as one did not exist anywhere I looked. I would like to know if it represents accurately what the design should be. If the forum permitted I would have just dumped the .sch file.J.R. Stoner

author: Greg J
author_rank: Regular Contributor
timestamp: January 08, 2012, 01:18:20 am
content: There is eagle library for the chip on farnels website.Besides, Dave published newer version of his schematic. So if you get a chance to update yours , we would love to see it(the actual eagle files, altho - if I finally get dip trace to actually work on mac, I'll move all my projects - including this mod - to it).
Looking to collaborate for uses for our Graphene/Graphite Conductive Coatings. - Page 1
Forum section: electronics / projects

author: stevefwg
author_rank: Newbie
timestamp: August 06, 2014, 03:31:55 pm
content: Hi all. We have been developing Graphene-Based inks and coatings over the past two years and we have now brought several products to the market.We work open source by choice and you can see some of our ink applications here:https://www.youtube.com/user/RobertMurraySmith/videosWe have recently developed a Heat Resistant ink used for producing low wattage/high heat output pads and panels. You can see how we made a simple painted radiator here:There are other applications we have been messing about with on the channel.But we would now like to work with the Maker/Producer community to explore just what useful products and devices our inks can be applied to.We are interested in what electronic control systems can be developed to run the projects. We are interested in working with people on concepts and designs etc.We don’t want to go into actual manufacture of finished products as all our energies are directed at producing inks and coatings with different and varied properties. But we would like to work in collaboration with anyone who has an idea for a project or is already in the process of production.Please feel free to post or contact me with ideas you might have.

author: jirk55
author_rank: Newbie
timestamp: December 04, 2017, 02:36:43 pm
content: That looks pretty interesting. I went for some info about graphene while writing my school project. Thanks for the video. I must say that the more I learn about this material and alsoothernanomaterials, the more Iam impressed by it. Really hope to see some rapid development in IT area.

author: cdev
author_rank: Super Contributor
timestamp: December 05, 2017, 11:42:27 pm
content: Antennas?
Looking to commission an expert in capacitive touch PCB layout for new sensor  - Page 1
Forum section: electronics / projects

author: TimB100
author_rank: Contributor
timestamp: September 05, 2017, 06:30:10 pm
content: Hi.I'm looking to find an expert in the physics of capacitive touch systems. I need a layout designed (not finger touch related) for a new sensor.There is a chap on you tube who knows his onions but cannot get hold of him.https://youtu.be/ZHzaVzYEZbwThanks...Tim

author: BrianHG
author_rank: Super Contributor
timestamp: September 06, 2017, 08:04:16 am
content: Are you planning to compete with Microchip's new capacitive gesture sensor technology?Or just interested in purchasing their system?

author: TimB100
author_rank: Contributor
timestamp: September 07, 2017, 10:33:56 am
content: HiMy design actually has nothing to do with finger touch sensing. It just so happens that the work done understanding how capacitive fields work is useful for my design requirements.I want a PCB layout that will be on a flexible PCB. The PCB will be rolled into a tube and I need to sense what is inside the tube. EG its capacitance disturbance.But I want the field to radiate inwards and be shielded on the out side.ThanksTim

author: DTJ
author_rank: Super Contributor
timestamp: September 07, 2017, 01:12:09 pm
content: Soil moisture sensor?

author: alanb
author_rank: Frequent Contributor
timestamp: September 07, 2017, 02:39:34 pm
content: I vaguely remember that you can't charge the inside of a spherical surface, the charge resides on the outside. Not sure if this will impact what you are trying to do but it would be worth checking the physics before investing money in the project.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: September 07, 2017, 04:53:00 pm
content: Quote from: alanb on September 07, 2017, 02:39:34 pmWhat would than mean for a capacitor consisting of two concentric shells.
Looking to convert a RS Robie Sr  - Page 1
Forum section: electronics / projects

author: lokin4areason
author_rank: Contributor
timestamp: October 30, 2024, 03:39:42 pm
content: hello allrecently picked up a radio shack robie sr and looking to convert it to something to roll around the flat .searched a few video(s) and they mentioned some kind of rasberry board along with using sensor(s) from a xbox 360 kinect for visual(s)has any one took on such a project or attemped too ?looking for suggestion(s), insight, recommendation(s) in making this project come alive . . . . . .PS , foto is what i am working with

author: lokin4areason
author_rank: Contributor
timestamp: October 31, 2024, 08:38:22 pm
content: looked into the board , it was a Raspberry Pi
Loop filter design question (AN/URQ-23) - Page 1
Forum section: electronics / projects

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: February 07, 2021, 06:43:14 pm
content: Hi,I'm playing around with a hermetically sealed loop filter module from the AM/URQ-23 for a project.I can't quite get my head around how the circuit works as described in the manual.Somewhat paraphrased:"...Therefore two time constants are used one is for short (1Sec) TC for normal operation and the other is for long (100Sec) for a longer loop integration time.To accomplish this a 1200 megohm resistor and 10 microfarad capacitor are used.A relay is used to switch time constants."Attached is the schematic. Note that the 2500 Megohm resistor vice the 1200 in the text.I can see the 1 Sec TC (100K X 10uF=1Sec)But I cannot figure out how the reconcile the 100Sec TC as (1200M X 10uF=12000Sec)!!!Any thoughts?Cheers,Corby

author: penfold
author_rank: Frequent Contributor
timestamp: February 07, 2021, 08:56:54 pm
content: Hi,I'm afraid I don't have an exact answer for you, but when the relay is closed, the resistance seen by the 10u (C1) is actually 10k in parallel with 100k (R3//R2), just adding further to the mystery

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: February 07, 2021, 09:56:06 pm
content: penfold, Good catch!Now I am even more confused.Too bad it's a sealed unit, I'd like to see how it's actually wired.Cheers,Corby

author: uncle_bob
author_rank: Unknown
timestamp: February 09, 2021, 10:24:47 pm
content: HiHere's where the confusion comes from:You have a PI loop. The P term sets the "time constant" of the loop. The resistor and capacitor are playing with the I term. The integrator time constant will always be much longer than the loop time constant.Bob
Loop pedal for music - Page 1
Forum section: electronics / projects

author: Rutherfordium
author_rank: Contributor
timestamp: March 29, 2017, 01:05:29 am
content: I'm doing research into a long term project (it really is a doozy) to build a high end loop pedal. The best in the industry is the Boss RC-300. It is a thing of beauty. Problem is, musicians are a very timid lot and I can't find any teardowns anywhere online. I'm wondering about things like quality of microcontrollers and separate ADC/DAC chips in these things. Does anyone here have any experience with these sorts of pedals or any information about the guts of them?

author: Someone
author_rank: Super Contributor
timestamp: March 29, 2017, 01:32:01 am
content: Its probably the ESC2 part that is used in a lot of the Roland/Boss products:http://jammusiccompany.ie/product/boss-loop-station-rc-3-loop-pedal/http://www.synthtopia.com/content/2015/11/18/inside-the-roland-system-1m-eurorack-synthesizer/Not much public information on it!

author: Rutherfordium
author_rank: Contributor
timestamp: March 29, 2017, 01:35:34 am
content: Aha, that makes sense. I guess a teardown wouldn't be very useful at all then. I'll have to just throw stuff at the wall until it starts to stick, I suppose.

author: John B
author_rank: Frequent Contributor
timestamp: March 29, 2017, 02:03:30 am
content: I suppose define what you mean by "high end" in this case...I used the Boss RC300 years ago, but moved on in favour of a laptop setup interfacing MIDI control pedals with software like Ableton Live, plogue bidule etc. That's what I would consider "high end". The appeal of the dedicated loop pedal is that all the controls and the digital to analogue audio hardware is all contained in one unit, but functionality wise it is limited compared to a computer setup. I know that doesn't really answer the engineering side, but market research on what bracket and musician demographic you're aiming at is important too. It sounds like you're aiming at people who want to getting into strictly looping, without the expense and the complexity of a computer setup. Unfortunately I don't have the boss pedal anymore, otherwise I could take some photos.