hybridfree/eevblog-posts huggingface dataset:
Recommendation for board to board connector with small footprint - Page 1
Forum section: electronics / projects

author: amaschas
author_rank: Regular Contributor
timestamp: April 18, 2023, 05:39:59 pm
content: Hey all, I'm designing an LED lighting application, and for the last couple of revisions I've used JST-XH connectors to deliver power from the driver board to the emitter board. My emitter board is a single layer aluminum PCB, so I have to use the surface-mount JST-XH connectors, and they take up a fair amount of space on the board. I'm looking for options for something with a smaller footprint, and that can fit cabling that is good in tight spaces. Some sort of flex cable would be best, but my use case probably exceeds the current limits of most flex cabling. I'm powering an array of RGB LEDs, and each channel draws a little over 1A at a maximum of 24V, so I think a connector/cable pairing that can handle 1.5-2A/30V per position would probably give me sufficient overhead. I've done a fair bit of searching, but the only thing I've come across so far is the Molex 505147 series, which could potentially work, though still a bit bulkier than I was hoping for. Any recommendations would be helpful!

author: reboots
author_rank: Regular Contributor
timestamp: April 18, 2023, 07:00:10 pm
content: This isn't exactly what you're asking for, but JST has much smaller low-profile wire-to-board connector series e.g. ACH, ACHL, ACHF and others. These are also significantly more compact than the Molex 505147.https://www.jst.com/products/crimp-style-connectors-wire-to-board-type/Digi-Key offer pre-crimped jumper leads for many of the JST series, which might be an economical alternative to suitable crimp tooling and labor for such small connectors.https://www.digikey.com/short/ntwbv9v1

author: amaschas
author_rank: Regular Contributor
timestamp: April 18, 2023, 07:17:28 pm
content: Quote from: reboots on April 18, 2023, 07:00:10 pmOh interesting, there look to be some good possibilities here. Thank you!

author: EPAIII
author_rank: Super Contributor
timestamp: May 13, 2023, 06:52:26 am
content: ZIF connectors and flat ribbon cable? Only 1A per contact, but you can always double up.https://www.mouser.com/ProductDetail/Molex/52207-0460?qs=3DzawVMofg%252B734N9HXUNVA%3D%3Dhttps://www.mouser.com/datasheet/2/276/0522070460_FFC_FPC_CONNECTORS-149493.pdfhttps://tools.molex.com/pdm_docs/sd/522070460_sd.pdfOr standard ribbon cable, again double up, and headers and IDC header connectors.
Recommendation for Custom LCD manufacturer - Page 1
Forum section: electronics / projects

author: R-1125F
author_rank: Regular Contributor
timestamp: August 11, 2023, 05:29:48 pm
content: Given that LCDs on older equipment are failing, if you want an exact fit and function, a custom LCD is probably the only option for replacement. I have never done anything like this and will only need parts in small quantities at a reasonable (i.e., cheap) price. These are nothing fancy, just need monochrome with a few special characters. Again, I have no experience with this and just need a place to start. Could someone recommend a custom LCD manufacturer that will produce small quantities at a reasonable price?

author: thm_w
author_rank: Super Contributor
timestamp: August 11, 2023, 09:32:27 pm
content: Did you watch Daves video?

author: R-1125F
author_rank: Regular Contributor
timestamp: August 11, 2023, 10:16:01 pm
content: Yes, but he did not make a specific recommendation for a manufacturer. Any ideas?

author: jkostb
author_rank: Regular Contributor
timestamp: August 12, 2023, 12:27:45 pm
content: These days all LCD displays are coming from Taiwan. So you need to find a manufacturer there. These manufacturers usually are only interested when MOQ > 5000. Have for example a look at Bolymin

author: R-1125F
author_rank: Regular Contributor
timestamp: August 12, 2023, 03:35:52 pm
content: This is for hobby projects. In Dave's video he mentioned getting very small quantities for prototypes. I am looking for Q<50.
Recommendation for finding replacement Memory backup battery (Varta V20HR) - Page 1
Forum section: electronics / projects

author: optoisolated
author_rank: Unknown
timestamp: August 11, 2025, 04:10:37 am
content: I am currently going through the process of recommissioning my iPaq 4150 from 2004 and have hit a stumbling block. It has two batteries. One is the main battery which was trivial to find a modern replacement for, however upon disassembling it (it has to be completely disassembled to find it) it has a rechargeable memory backup battery which after finally getting it out, is identified as a Varta V20HR 1.2v 18mAh rechargeable battery. Finding replacements for this is proving very difficult indeed. I found one place that sells them but they would require me to spot weld new connectors onto it. I can do that, but before I drop the money for it ($12 + $19 p&H), I wanted to find out if there was something better I could replace it with? A modern day replacement for the NiMH cells?Forgot to mention, the cell measures 11.6mm Diameter x 2.5mm (with spot weld tabs)

author: Rolo
author_rank: Regular Contributor
timestamp: August 11, 2025, 04:58:46 am
content: Modern day replacement is Varta V18HRT, but this has no tabs either.

author: optoisolated
author_rank: Unknown
timestamp: August 11, 2025, 05:29:04 am
content: Even that seems hard to find nowadays. Only one i can find in any volume has two in the package. That might be okay, I will have to disassemble it.
Recommendation for foam to protect PCB around M6 terminals  - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: October 22, 2022, 02:28:43 am
content: I have a need for some adhesive foam protection (or similar) to apply over a PCB area where there are M6 press-fit terminals and also mosfets.Something I can get cut into a shape and then stuck over the top of the PCB to offer some protection during final assembly.Dropping nuts and tools onto the PCB while doing up the M6 nuts may damage component etc..Does anyone have a recommendation for types of materials to use? or types of materials to avoid?I'm thinking just some die-cut dense adhesive foam shaped to the PCB area?I guess my question is really around any warnings you might have.Maybe some foams/adhesives might outgas something that could corrode the PCB etc.. While others would be safe?Doesn't have to be foam, just something to absorb minor drop impacts from 10cm above the PCB.Perhaps I just need to make sure the foam is rated as "ESD safe" as an indication that it's ok for PCBs?Thanks

author: Psi
author_rank: Super Contributor
timestamp: October 24, 2022, 12:48:47 am
content: No one has any PCB-safe foam recommendations?

author: bugrobotics
author_rank: Regular Contributor
timestamp: October 24, 2022, 12:50:58 pm
content: I've used this stuff from Mcmaster (PN 93625K15). Natural gum rubber with acrylic adhesive.
Recommendation for good heat sink source? - Page 1
Forum section: electronics / projects

author: MatCat
author_rank: Frequent Contributor
timestamp: August 30, 2013, 08:02:57 pm
content: I am working on a DC-DC switching supply design based on the LM2596S-12, my current board design is roughly 2"x2" with a full 1oz copper ground plane / heat sink on the bottom layer, I can run up to about a 1.5A load on the board and keep the thermal requirements just barely in check, but I want this board to be able to handle 2A continuous so it's obvious I need a heatsink, I am curious to know what company is recommended for a preferable stock component, the production level of these will probably be under 1000 units a batch so custom extrusion is out of the question, any recommendations?

author: senso
author_rank: Frequent Contributor
timestamp: August 30, 2013, 10:09:24 pm
content: Aavid Thermalloy is the first that springs to mind, but do a search for heatsinks at Mouser or Digikey, tons of different models and manufacturers to choose from.

author: MatCat
author_rank: Frequent Contributor
timestamp: August 30, 2013, 11:13:33 pm
content: Quote from: senso on August 30, 2013, 10:09:24 pmAwesome, just took a look at their website and think I am going to sample a few things to test out.

author: nctnico
author_rank: Super Contributor
timestamp: August 31, 2013, 08:34:14 am
content: I'd look at Digikey, Farnell, Mouser, etc and see what they stock up. There are DPAK heatsinks from Fisher. OTOH the simple switcher devices aren't the most up to date devices to use. Better look at some new chips from TI preferably with a synchronous rectifier. Most of the heat is produced in the diode.

author: MatCat
author_rank: Frequent Contributor
timestamp: August 31, 2013, 06:23:22 pm
content: Quote from: nctnico on August 31, 2013, 08:34:14 amIf you know a part # that would be suitable that would be great, my main concern is the ability to handle 3A, I have been digging deep for a good alternative especially a cheaper one, because the LM2596 isn't exactly that cheap.As far as the heatsinking itself goes size matters here, this product is designed for model aircraft so crazy wierd odd sized and shaped heatsinks like a lot of the DPAK ones aren't really feasible here, though probably would offer much better heat handling then the flat back style heat sinks I want to try out.

author: free_electron
author_rank: Super Contributor
timestamp: August 31, 2013, 06:47:10 pm
content: thermalloy. they have special heatsink for surface mounted to263 packages. you solder them on the copper slab and they sit 'over' the device.

author: MatCat
author_rank: Frequent Contributor
timestamp: August 31, 2013, 09:23:30 pm
content: My specs are Input range from 14V to 45V, and 3A continuous output. I tried quite hard to find a part to fit my needs, and taking into account pricing and function it seemed to be the best I could find, I am open to any better alternative, doesn't have to be DPAK though if it was it would mean less re-design.
Recommendation for pluggable connector  - Page 1
Forum section: electronics / projects

author: mickeysceme
author_rank: Newbie
timestamp: February 13, 2019, 05:39:09 pm
content: Hi guys,My name is Mike, I am currently working as a Mechanical Design Engineer in the lighting industry. The project I am working on involves electrical part in it, and selection of drivers and connectors amongst other tasks.I am looking for a 2 pole/circuit connector that will look like this one wago 890I am looking for something more compact with push in wire capabilities, ideally panel mount on one side and plug on the other. If possible, with a latch for locking.I also checked for AVX, BINDER, PHOENIX, TE and MOLEX vendors. All connectors require assembly of pins and wires to complete the harness assembly, I am looking for push in or some other mechanical quick assembly that does not require additional processes.Any help is very much appreciated.Best regards,Mike

author: TimNJ
author_rank: Super Contributor
timestamp: February 13, 2019, 09:44:52 pm
content: So you want to push the wire into a male plug, and then plug that into a female header on the product?Do you need to use a plug-able connector? How about plugging bare wire directly into the product with spring-loaded contacts? Not allowed?

author: ajb
author_rank: Super Contributor
timestamp: February 13, 2019, 09:54:15 pm
content: What are your current/voltage requirements?
Recommendations for a delay generator - Page 1
Forum section: electronics / projects

author: tuvtuv
author_rank: Contributor
timestamp: December 25, 2017, 01:18:06 pm
content: We are doing research here at the university on conformers of organic molecules using pulsed lasers, molecular beam, and a desorption laser.All this devices are synced using delay generators, one is homebuilt, and the other is DG535 (made by Stanford Research Systems), the DG535 is synced using the clock of the homebuilt delay generator).Our problem is that we now wish to use DG535 automatically using labview, but the device seems to fail, deleting all its settings upon few communication tries. so - we now wish to buy a new delay generator, but for a lower price (used DG535 costs 1200$ on ebay), is there a cheaper option? i will remark that the 60ps delay jitter of the DG535 is beyond our need, we can do with 10ns jitter.so is there a cheap (few hundreds of dollars) delay generator with at least 3 channels capable of less than 10/20ns jitter?thanks in advance

author: LaserSteve
author_rank: Super Contributor
timestamp: December 25, 2017, 03:07:03 pm
content: Former lab laser field service tech here. My bet is the DG535 is retaining its settings and your dealing with a Labview issue.Labview VIs are notorious for changing settings, often due to a user missing a connection in the graphical editor.Have you talked with SRS about this, their tech support has always been first rate.The two standards in the nanosecond laser industry are SRS and Quantum Composers.Steve

author: LaserSteve
author_rank: Super Contributor
timestamp: December 25, 2017, 03:15:53 pm
content: The only OEM delay boards I can think of are from Highland Technology.Steve

author: Someone
author_rank: Super Contributor
timestamp: December 25, 2017, 10:38:43 pm
content: Quote from: tuvtuv on December 25, 2017, 01:18:06 pmThese sorts of figures are trivial with an FPGA, but then its back around to building your own and the cost/time tradeoff.

author: tuvtuv
author_rank: Contributor
timestamp: December 26, 2017, 08:32:44 am
content: Quote from: LaserSteve on December 25, 2017, 03:07:03 pmi have used labview's gpib terminal not a fancy graphical interface... but maybe i should contact SRS, maybe it's a known issue with a solutionQuote from: Someone on December 25, 2017, 10:38:43 pmthis is the same answer i got from our department's electrical engineer, but im afraid that it might be too time consuming for us to build one, building interface, board design, debugging, its might not be worth the time as we need to concentrate on the research itselfQuote from: LaserSteve on December 25, 2017, 03:15:53 pmthanks for the advice! i've asked them for a price quote
Recommendations for a SSR IC for high speed ATE switch matrix? - Page 1
Forum section: electronics / projects

author: MajorEE
author_rank: Contributor
timestamp: April 30, 2022, 07:27:35 pm
content: I am looking for a higher performance SSR IC to built a solid state switch matrix for an ATE. Anyone have any recommendations on something more generally available?I have been testing the VOR1121 SSR from Vishay but it has a lot of on capacitance ~40pF.Attached is a paper discussing a Yokogawa part that had <5pF capacitance, and >200V rating.I have been building switches using reed relays like a Cotos but I am looking to bring a solid state product out as well. Alternatively, I was thinking about using a photovoltaic coupler and some COTS FETs, too.Thoughts or recommendations?Thanks!
Recommendations for commonly chosen ICs - Page 1
Forum section: electronics / projects

author: jbb
author_rank: Super Contributor
timestamp: May 04, 2024, 04:10:04 am
content: Hi allI'm finally getting a design underway and have selected some of the major components. However, there are a few peripheral parts which I need to select. Can anyone suggest common / jellybean choices for the following:An I2C port expander. I expect to have 2 of them on the same bus, so I'd like one with address select pin(s)A Digital to Analog Converter for DC level setting. I need something like 4 channels @ 12 bits, and all the options on DigiKey seem to be really expensive at the moment. I2C preferred, SPI would be OK.A clock multiplier to get from a crystal (say 10 MHz) to 180 MHz. I'm thinking the Si5351A...Background: I want to build an Impedance Analyser to operate from 50 Hz to 10 MHz (and maybe above 10MHz in the future).Current plan is to build an auto-balancing RF bridge. Drive voltage (Force +) and balance current (Force -) sine waves will be generated by two channels of an AD9106 quad Direct Digital Synthesis (DDS) chip and appropriate analog circuitry.The remaining two channels of the AD9106 generate a quadrature LO which is then used to demodulate the measurement signals back down to I and Q signals with a Tayloe mixer (aka a Zero IF approach).Unfortunately, the AD9106 uses a common DDS frequency for all four channels. The standard functionality lets you vary the phase shift and/or amplitude of each channel, but not generate a second frequency. Hence the initial plan above. (I am toying with a notion that it might be possible to manipulate the AD9106 into generating an output which isoffsetfrom the main frequency, but I'm not super confident it's possible.)I admired theTeensy-LCRbyWeTec, which tops out around 90 kHz. Moving up to 10 MHz should give me some visibility into the self resonant frequencies of home made transformers etc.

author: Smokey
author_rank: Super Contributor
timestamp: May 04, 2024, 04:57:04 am
content: careful out there!https://www.eevblog.com/forum/dodgy-technology/mcp23017-same-part-number-two-fewer-inputs/

author: PCB.Wiz
author_rank: Super Contributor
timestamp: May 04, 2024, 05:10:46 am
content: An I2C port expander. I expect to have 2 of them on the same bus, so I'd like one with address select pin(s)The xx8574 is old but widely popular. Check if it is 'good enough'A Digital to Analog Converter for DC level setting. I need something like 4 channels @ 12 bits, and all the options on DigiKey seem to be really expensive at the moment. I2C preferred, SPI would be OK.MCU's like EFM8BB3 / EFM8LB1 have 4 x 12b DACs and can be cheaper than DACs alone. How fast to they need to be ?A clock multiplier to get from a crystal (say 10 MHz) to 180 MHz. I'm thinking the Si5351A...That was briefly hard to get, but seems better now.There is also a clone MS5351M available on lcsc, which also keeps the Si5351A price honest.

author: jbb
author_rank: Super Contributor
timestamp: May 05, 2024, 09:35:33 am
content: DACs are basically DC, used for level setting. Even a 1 kSample/second update rate is likely sufficient
Recommendations for connectors to fit solderless breadboards - Page 1
Forum section: electronics / projects

author: Cerebus
author_rank: Super Contributor
timestamp: August 02, 2016, 05:44:12 pm
content: I'm looking for recommendations for high qualitysingle pinconnectors for making test leads intended to be used with solderless breadboards.All the common connectors used with breadboards (for example the ubiquitous DuPont crimp terminals) aren't really suitable for terminating standard test lead cabling. Cable that will fit the common small single pin connectors is too small to get a satisfactory connection and adequate cable strain relief on a 4mm banana plug or similar.What I'm looking for is a connector that will neatly terminate the flexible multistrand type cable that's commonly associated with multimeter leads and 4mm test leads but has a fine enough tip to easily push into a solderless breadboard.

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: August 02, 2016, 06:08:13 pm
content: My solution for this problem is to use intermediary 2 mm banana plugs.I have made test leads from 4 mm banana plug (multimeter or PSU side)to 2 mm male. These are in standard heavy duty silicon cable.Then I devised several kinds of adaptors from 2mm female to either minigrip ordirectly soldered a golden coated pin (used for wire wrap) in a 2mm female plug.I can thus used all these adaptors with smaller wires for breadboard use or any time I need precise testing, or direct plug intothe breadboard.

author: ajb
author_rank: Super Contributor
timestamp: August 02, 2016, 11:01:42 pm
content: Male d-sub pins, crimp or solder as you prefer.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 02, 2016, 11:14:27 pm
content: You willing to buy a crimping tool?

author: Ian.M
author_rank: Super Contributor
timestamp: August 02, 2016, 11:19:43 pm
content: The contacts from a normal PC 5-1/4" peripheral power connector fit nicely over most test probes. Remove from shell and add heatshrink for insulation.I wouldn't make a direct to breadboard adapter without a short flexible lead in-between as the amount of leverage the test probe or banana plug has on it would be more than enough to damage your breadboard contacts.

author: Cerebus
author_rank: Super Contributor
timestamp: August 14, 2016, 11:23:31 pm
content: Sorry, I lost this thread somewhere on the way.Alex - Yes, I'd consider something that needed a crimp tool. In fact I might prefer it. I already own quite a collection of crimp tools and in fact I'm currently in the market for a new tool/die sets for BNCs for RG58 and RG-that-nice-thin-stuff-I-can-never-remember-what-the-number-is.The others - thanks for the suggestions. It looks like I may have to go with a more homebrew solution like Jacques'. I was hoping that I'd missed some suitable commercial connectors in my travels that others had spotted/repurposed before me.
Recommendations for Digital 100MHz dual channel oscilloscope - Page 1
Forum section: electronics / projects

author: moffy
author_rank: Super Contributor
timestamp: January 07, 2015, 11:10:02 pm
content: I need to upgrade from an analog 20MHz scope to digital. Have between $600-$800AUD. What would you recommend and why? Thanks for the advice.

author: Lightages
author_rank: Unknown
timestamp: January 08, 2015, 12:29:33 am
content: There are quite a few recent threads relating to your question.The most recommended right now is either the Rigol DS2072A for two channels or the Rigol DS1054Z and upgrade them.

author: moffy
author_rank: Super Contributor
timestamp: January 08, 2015, 12:49:06 am
content: Thanks will look at them. Any apart from Rigol?

author: Lightages
author_rank: Unknown
timestamp: January 08, 2015, 02:43:25 am
content: I think in the price range you are looking at, there isn't much else to compete.

author: moffy
author_rank: Super Contributor
timestamp: January 11, 2015, 02:41:03 am
content: Thanks for the advice. I went with the Rigol MSO1074Z. A bit out of my price range, but I think worth it for the larger screen and Logic Analyser. It is quite a steep learning curve from my old analogue scope.

author: devanno
author_rank: Regular Contributor
timestamp: January 11, 2015, 07:30:13 pm
content: Include the Siglent SDS1102CML too. The Rigol 1000z series is probably a touch above. The Siglent can be had for about $356 US. (just checked on Amazon) Look at some video reviews too, so you see the screen resolutions and differences. I have the Siglent and have not put it through any heavy duty use, but it seems to work quite well for what I've done with it. I have a Rigol DS2072A and it's a significantly nicer 'scope, but then, it's twice the price of the Siglent.

author: moffy
author_rank: Super Contributor
timestamp: January 12, 2015, 11:10:32 pm
content: Thanks. My new scope broke yesterday, Channel BW LIMIT and INVERT soft buttons would not toggle. Rang my local supplier, Emona Instruments, and they sent a new update patch within 10 mins which fixed the problem. Nice to have good local supplier.
Recommendations for LCD Prototyping (on the relatively cheap) - Page 1
Forum section: electronics / projects

author: kevyk
author_rank: Contributor
timestamp: October 30, 2024, 01:31:28 am
content: Hi. I am looking for a company that can manufacture small-ish custom B/W LCD displays for a low current battery operated project.Does anyone have experience with a company that they were pleased with and can recommend for small scale production?I need maybe 5 units for prototype and 100 units purchased. This would be a reflective 3.3v custom display with some icons and segmented numerics.Thanks,KevinBard Designsbard-designs.com

author: PCB.Wiz
author_rank: Super Contributor
timestamp: October 30, 2024, 02:49:52 am
content: Maybe start here ?https://hackaday.com/2018/07/24/custom-lcd-module-is-unexpectedly-cheap-and-easy/

author: kevyk
author_rank: Contributor
timestamp: October 30, 2024, 02:54:45 am
content: Thanks. I did see the video Dave put out a long time ago re. custom LCD's but he was reluctant to mention the Chinese manufacturer, thus I'm putting the call out here. Ideally I'd like my NRE to be < a few hundred $.
Recommendations for PCB assembly in Europe? - Page 1
Forum section: electronics / projects

author: Boscoe
author_rank: Frequent Contributor
timestamp: June 24, 2021, 02:04:00 pm
content: Hi all,I moved to Europe from the UK just before Brexit. I have good contacts in the UK for PCB assembly etc however the import duty and shipping is making it very unattractive to purchase from the UK. I understand I can google (I have a lot of results) but I'd like to get some recommendations from people who have used the services. I'm based in Portugal however it doesn't matter where in Europe I purchase from as long as they can speak English or have an English website.I'm looking for a two companies, really. One for low volume samples and one for high volume production potentially with production line testing and programming capabilities.Many thanks for your help!George

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 24, 2021, 03:05:29 pm
content: Eurocircuits

author: voltsandjolts
author_rank: Unknown
timestamp: June 24, 2021, 03:21:33 pm
content: Quote from: Boscoe on June 24, 2021, 02:04:00 pmWho would you recommend for assembly in the UK?
Recommendations for SMD inductor and capacitor sample kits? - Page 1
Forum section: electronics / projects

author: splin
author_rank: Frequent Contributor
timestamp: May 26, 2020, 09:58:38 pm
content: I'd like to have a stock of say 0603 and 0805 capacitors and inductors for the lab for prototyping, testing, experimenting and occasional repairs. This will include mixed analog and digital apllications such as filtering low power switching regulators, filtering voltage references for ADCs, compensation caps for opamps etc. - ie. mostly undemanding.I have stock of the most common decoupling caps. There are plenty of sample kits available on Aliexpress of unknown quality but probably perfectly Ok for non-critical applications. For example £21.75 for 47 values, 1nH to 100uH x 25 pieces 0805 inductors in a sample book (there are cheaper selections but the sample book is useful and worth around £6 alone):https://www.aliexpress.com/item/33051989082.html?spm=a2g0o.productlist.0.0.5860abe0yxQryu&algo_pvid=ca2262c8-6831-47f6-864e-2ce3e337f9a6&algo_expid=ca2262c8-6831-47f6-864e-2ce3e337f9a6-38&btsid=0be3764515905258753392780ee9bf&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_Similarly for capacitors. Problem is that there is a lot of choice and I could end up with an awful lot of parts that never get used and it could get expensive by the time you decide to add 0402 and perhaps 1206 into the mix, NPO and X7R etc. At least smd parts in sample books don't take up much space. But when the time comes, the chances are you still don't have a suitable part so end up having to order some in anyway (eg. high voltage or 1% capacitors for a filter etc.).An alternative is to buy much more limited selection of quality parts from a distributor and order in parts that I don't have in stock as needed.This can get expensive too if you don't get free shipping - or you end up waiting until you can consolidate enough orders to get free shipping.I'm sure plenty of others have been in the same situation, so what did you do or recommend? Are there any well priced sample kits from good quality manufactures available - most seem to be pretty expensive?

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: May 26, 2020, 10:22:24 pm
content: I have a bunch of these chinese sample books, and i can't complain about the quality. They seem to be made from leftover reels that didn't have enough parts of them to finish a production run. Minor issues i've encountered: Some single value strips seemed to have some water damage, the paper strip had some discoloration.
Recommendations on high voltage boost converters - Page 1
Forum section: electronics / projects

author: sahko123
author_rank: Frequent Contributor
timestamp: April 28, 2021, 02:26:01 am
content: Im looking for a small ic for a 12v input boost converters to 60-90V dc output with no more than 1mAAlong with this im also looking for a higher power ic/solution for nixie tube powering so 170V nominal at at most 15mA. The input being more flexible but still within 45V or so.I cant find any searching myself. For the 170V I want to avoid needing a high voltage output mains transformer if I can and for the 60-90V i have no choice but to run from 12V input

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 28, 2021, 05:30:17 am
content: Easy: any boost controller/regulator e.g. UC3843, and an offline inverter transformer e.g. Pulse P5009NL wired in reverse.Is the 60-90 for a separate thing, or what? It's also feasible to do in a single (boost) stage, or even a charge pump (555 timer + multiplier).Tim

author: Wolfram
author_rank: Frequent Contributor
timestamp: April 28, 2021, 08:48:50 am
content: Also look into tapped-inductor boost using commercial coupled inductors, the SRF0703 series for example. I've had success with this where the ratio is too high for a regular boost, and you don't need enough power to justify the cost and size of an off-the-shelf flyback transformer in reverse.

author: sahko123
author_rank: Frequent Contributor
timestamp: April 28, 2021, 02:55:00 pm
content: 60-90 is for a separate thing yes

author: David Hess
author_rank: Super Contributor
timestamp: April 29, 2021, 09:49:38 pm
content: As usual, I recommend any boost converter driving a charge pump.
Recommended DC/DC IC for 10-30Vdc to 5Vdc 2A Isolated - Page 1
Forum section: electronics / projects

author: Gonzakpo
author_rank: Newbie
timestamp: June 29, 2022, 05:40:12 pm
content: Hello Everyone.I need to design a power supply for a project and I need to get 5Vdc 2A Isolated out of a 10-30Vdc input.I was thinking of a flyback configuration with a TL431 feedback. I infact made a simulations using the infamous MC34063 because it's available EVERYWHERE but I exceed the switch current when working with the Vin min (10V). I can't satisfy the 5V 2A requirement.I don't know how much of you guys know about the present worldwide situation about low stocks, but it's getting VERY dificult to find stock of ICs in general. So I like to idea of using a very well known IC and not just an specific IC.Can you give me some recommendations? Thanks!!

author: m k
author_rank: Super Contributor
timestamp: July 01, 2022, 09:29:52 am
content: Since the situation is what it is maybe you should consider outsourcing.Places like Murata may have an almost ready stock.
Recommended IC for simple 3A SLA to SLA Boosting battery charger (Costdown) - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: April 13, 2021, 05:30:43 am
content: Looking for some IC recommendations.I made a new battery charger product using an LTC4162-S IC, just to get something to customer ASAP with limited testing required. It all works well. but is expensive due to the LTC4162-SNow that I have some time I want to do a cost down and also improve/simplify the design a little.Can anyone recommend a cheap DCDC IC with input 12V or 24V (automotive batt) and then BUCK+BOOST to dump 3A into a 12V lead acid battery? (Needs to handle 12V to 12V or 24V to 12V)Obviously will need error amps for current limit feedback and voltage limit to 14.4V.Current limit cannot be low side resistor, sadly.This isn't running 24/7 So no need for anything advance with different charging modes. It just needs to dump 3A from one batt to the other until the voltage is 14.4VAny ideas?It does need to be reliable, so no $3 aliexpress DCDC SEPIC modules
record high frequency switchmode power supply? - Page 1
Forum section: electronics / projects

author: ftransform
author_rank: Frequent Contributor
timestamp: June 25, 2013, 02:53:48 pm
content: So what is the worlds highest frequency switching power supply? I assume there must be some very interesting devices in research labs....inspired by the PCB inductor SMPSU thread.

author: c4757p
author_rank: Super Contributor
timestamp: June 25, 2013, 03:04:08 pm
content: Quote from: ftransform on June 25, 2013, 02:53:48 pmI must have missed that thread - sounds interesting.I recall seeing an article a while back about on-die SMPS. (Yes, including inductor and capacitor.) The frequency must be quite high to accomplish that. Not sure I see the point, though - seems like a dreadful waste of silicon to me. I'll see if I can find it.OT: I love how the spell-check in Google Chrome nails all sorts of obscure computer science terminology, but misses "inductor". It misses "multimeter" too. I didn't really think the programmers would be the ones compiling the word lists.

author: calmtron
author_rank: Regular Contributor
timestamp: June 25, 2013, 03:19:31 pm
content: Here's apaperdescribing a 110MHz boost converter

author: Rufus
author_rank: Super Contributor
timestamp: June 25, 2013, 03:24:15 pm
content: Quote from: ftransform on June 25, 2013, 02:53:48 pmThe highest frequencies would be used where you have the least space for magnetics and capacitors.Intel's new Haswell integrated voltage regulators must be pushing the limit of what is practical. They say up to 140MHz.
Record voltage across current-sensing resistor - Page 1
Forum section: electronics / projects

author: davekeck
author_rank: Contributor
timestamp: February 03, 2020, 02:14:51 pm
content: Hey all, I'm designing a PCB and would like to measure its charge consumption by integrating the current through a current-sensing resistor.I assumed there'd be some pre-existing solution to record the voltage across a current-sensing resistor at a high rate, but I can't seem to find anything.What would you use to sample+record the voltage across a current-sensing resistor at a high rate (khz-mhz) for a few seconds?

author: KaneTW
author_rank: Frequent Contributor
timestamp: February 03, 2020, 02:16:52 pm
content: Integrator with a suitable time constant.

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: February 03, 2020, 02:35:41 pm
content: It depends on what dynamic range you are looking to measure and at what speed. If the dynamic range is not large, then a scope with differential probe will do the trick. Use the uCurrent by Dave for the I to V conversion and feed the signal to a DSO. DSO can store the waveform for many seconds.For high dynamic range, use a DMM with Digitizer option. Or a dedicated power profiler tool.

author: David Hess
author_rank: Super Contributor
timestamp: February 04, 2020, 02:45:10 pm
content: Quote from: davekeck on February 03, 2020, 02:14:51 pmI would integrate it in the analog domain with a single operational amplifier. But as EEEnthusiast points out, many DSOs have an integrate function which can do it.

author: sam[PS]
author_rank: Contributor
timestamp: February 28, 2020, 06:02:46 am
content: What about using a high side or cheaper low side curent sensor IC ? Some can be found pretty cheap these days (probably cheaper than a home made circuit) and they can be found in I2C or SPI output flavor, just slap any MCU there to record the data. It should be good up to few kHz region, just check the datasheets to be sure.Now if you want to be up to the MHz region then that's another story, we are talking about a not so easy analog front end, a pretty serious ADC probably JEDC204B interface and a decent FPGA to manage it. That's probably much more complex than the remaining of the PCB you want to monitor. Plus if you are monitoring the board power supply, you probably have loads of decoupling capacitor there that limit the bandwidth anyway so i don't see the point in this.Just my 2cts...
Recording & displaying data on a windows PC from I2C/SPI bus ?? - Page 1
Forum section: electronics / projects

author: smoothVTer
author_rank: Regular Contributor
timestamp: April 12, 2018, 09:05:23 pm
content: What are some methods for real-time graphing display and record of SPI and/or I2C data streams? I am looking for the simplest solution possible. There are all manner of "IoT" solutions out there with god-knows-what kinds of crazy cloud services to do this with specific hardware, but I am an e.e. looking for a lab-rolled method to do this on a windows machine. My skills in windows programming are null. There must be software out there which already has this capability?Something like:SPI/I2C bus --> USB conversion hub --> Windows PC --> graphical software UIData source is X,Y,Z data from any accelerometer.For the record, I can parse and modify the SPI/I2C data stream into any format I want using a FIFO buffer implemented on any microcontroller. I understand the software would have to be configured somehow to recognize where the X/Y/Z values in the stream start and end, but I'll cross that bridge when I get to it.
recording IR signals - Page 1
Forum section: electronics / projects

author: croyleje
author_rank: Regular Contributor
timestamp: October 14, 2014, 04:05:34 am
content: Hello everyone,I am trying to capture and record some IR signals from a MIRT system I have made a simple circuit out of a IR photo-transistor and was using a digital voice recorder to save the data but the sample rate of the digital voice recorded isn't fast enough to pick up the carrier frequency. I don't think it is the standard 38kHz any ideas I thought about buying a cheap hand held scope but I don't think they have the memory depth I would need and a nice one is to expense to be justified for this simple project. Any ideas would be great I was thinking that maybe an old style micro cassette recorder might work the analog tape I think should pick up the carrier freq but any ideas you guys have would be great. Also this is being done in the field I don't have access to my bench scope looking to record in the field then take it home and decode it there. Worse case Ill hook up my inverter in my truck and put my Rigol on the passenger seat but don't really want to do that.Thank you,Jasonps i have looked at the arduino IR libraries but they look like they only record remotes doesn't look like you can save the data to the eeprom and get it out when you get back home.

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 14, 2014, 04:08:31 am
content: The sound card in a modern PC can do 96kHz and some can do 192kHz.

author: croyleje
author_rank: Regular Contributor
timestamp: October 14, 2014, 04:23:17 am
content: That would work I guess with my laptop and just record the data as a wav file do you know if there is a way to find out what the sample rate of a cheap laptop build in sound card is?Jason

author: geggi1
author_rank: Frequent Contributor
timestamp: October 14, 2014, 07:57:05 pm
content: If it is on off signals you can possible use a few photo transistors and a serial port to a PC, arduino or something similar.Another option is to fit a photo transistor to an digitale scope to capture the data stream.

author: JoeO
author_rank: Frequent Contributor
timestamp: October 14, 2014, 08:27:30 pm
content: Do you HAVE a MIRT transmitter?

author: croyleje
author_rank: Regular Contributor
timestamp: October 14, 2014, 10:38:33 pm
content: JoeO yes i was lucky enough to pick one up at a bodyshop i have friends working at, a local cop car was in being fixed. i have established that it transmits the aprox 14Hz data pulses but in Maryland where I live they switched over to a system that uses authentication. From what i can find online the unit will transmit an authentication code first then the 14Hz pulse the best i can tell is the authentication comes from a part of the unit i don't have i plan on parking by the side of the road and waiting for a few cops to drive by with there lights on and try to capture the code but i need a way of recording the data that is fast enough to pick up the carrier frequency. i like the idea of sound card i think i will try that first. but any ideas i am game.
Recover Signal From Power Rail - Page 1
Forum section: electronics / projects

author: klr5205
author_rank: Regular Contributor
timestamp: June 20, 2019, 02:43:20 pm
content: I have an audio belt pack which receives audio superimposed on the 24VDC rail that powers the pack. In addition to audio, there can be a 20kHz "Call" tone present on the line. I'd like to detect this 20kHz tone and use it to trigger things.My initial thought was to simply capacitively couple the power rail to the input of a high pass filter ---> peak detector ---> comparator ---> OUTPUTJust wanted to pick the brain of the hive mind to see if there was a better or more obvious way.

author: cur8xgo
author_rank: Regular Contributor
timestamp: June 20, 2019, 03:10:36 pm
content: Quote from: klr5205 on June 20, 2019, 02:43:20 pmIf you are learning, your idea seems like a great way to get involved in many different things of once, with the possibility of success as well.Might want to consider a resonant circuit that only responds to the frequency of interest. Otherwise any high frequency noise could look like the signal.This would be a great circuit to simulate as well..could fit everything in there and it would be realistic to the end product.
RECTIFIER - Page 1
Forum section: electronics / projects

author: Abayomi
author_rank: Contributor
timestamp: July 08, 2016, 11:47:32 pm
content: Please I need help me out. I wanted to build a voltage regulator but I hanged at the rectifier stage, the transformer i used is a 30v 2A but in the schematic it is 30v 1A, I connected a bridge diode to and a filter capacitor to rectify it to DC, the output voltage is 41V. this is strange, I thought, how can the output voltage be greater the transformer voltage? Please any suggestions. As for me I thought it is the value of the filter capacitor.

author: djacobow
author_rank: Super Contributor
timestamp: July 09, 2016, 12:52:46 am
content: You should repost in beginners.The transformer output is rated using the RMS AC voltage. The smoothed rectifier output will reflect the AC peak, which is sqrt(2) higher than the RMS voltage.Lots and lots of information on rectifiers and RMS on the interwebs.

author: ataradov
author_rank: Super Contributor
timestamp: July 09, 2016, 12:54:50 am
content: Start from reading thishttps://en.wikipedia.org/wiki/Root_mean_square30 * 1.41 = 42 V, so the peak amplitude on the output of your transformer is 42 V, but RMS voltage is 30 V.

author: MosherIV
author_rank: Super Contributor
timestamp: July 09, 2016, 09:37:23 am
content: Hi, as the others have said, nothing to worry about, that is normal.What it means is that you have an unregulated 30V power supply.At full load (drawing 2A) the output will show nearly 10V of ripple, the ps voltage wil rise/fall down to 30V and upto 40V.With no load, the output voltage will show around 40VThe 'ripple' is due the the capacitor unable to supply enough current to the outout andthe voltage drops.This should hapoen at a frequency of 100Hz (2x mains freq due to rectification)QuoteDo you mean, you want to build a regulated power supply?Is it fixed at 30V with 2A output?
Rectifier Design - Page 1
Forum section: electronics / projects

author: merymery
author_rank: Contributor
timestamp: March 22, 2021, 05:17:19 pm
content: Hello, in the article below, a 30 MHz resonant SEPIC converter has been designed. For my homework, I am trying to make a circuit with 3.7 V input, 2.9 V output voltage and 1.5 A output current, operating at 10 MHz switching frequency. First I started with the rectifier design. The rectifier design is based on fr, Zr and k values. The k value starts with vo / vin and the fr value is scanned and the resonance frequency is selected when the input current and voltage are in the same phase. The Zr is then scanned until the output power is obtained. There is an ltspice file in the attachment. When trying to bring the current and voltage to the same phase, should I just change the fr or should I change the inductor and capacitor values as well?

author: drussell
author_rank: Super Contributor
timestamp: March 22, 2021, 05:47:00 pm
content: Are you asking someone to do your homework assignment for you?

author: merymery
author_rank: Contributor
timestamp: March 22, 2021, 06:48:40 pm
content: Is this message understood from what I have written? I just wanted to ask if I should change only the frequency or the component values while bringing the current and voltage to the same phase? Because when I just changed the frequency, the current and voltage did not come to the same phase.

author: Vovk_Z
author_rank: Super Contributor
timestamp: March 22, 2021, 07:47:57 pm
content: Quote from: merymery on March 22, 2021, 05:17:19 pmI have read this article a bit. It seems to me, the answer is here:"The scaling factor k is selected first. The initial value of k is selected as k = Vo/VIN.Then fR is sweptuntil vsin1 and isin1 are in phase. Once k and fR are decided, the duty ratio of the diode is determined" (III. PROPOSED DESIGN METHOD FOR RESONANT SEPIC CONVERTER, p.457).

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 23, 2021, 03:11:37 pm
content: Hi,in the LTspice model rec.asc, you have defined V2 as:SINE(0 4.71 9M)SPICE does not care about case9M = 9m = 9 millihertz = 9E-3If you want MHzspecify the source as:SINE(0 4.71 9MEG)9MEG = 9 MHz = 9E6 HzYour simulation will work at lot better.Jay_Diddy_B
Rectifier - Regulator integration - Page 1
Forum section: electronics / projects

author: shaikss
author_rank: Newbie
timestamp: June 24, 2013, 11:38:16 am
content: Hi Folks,I have designed a rectifier and a regulator as independent entities. Both of these blocks are working fine when simulated in virtuoso independently. But when I integrate them, i.e when I connect regulator to rectifier, I am unable to see regulated output. I have attached the snapshot of rectifier and regulator blocks. For regulator, I have used another circuit to derive reference voltage Vref. Note: I have used 4-stage rectifier for which the current at the output of the rectifier is 2uA. Pls let me know why it is happening so. The first snapshot is the regulator ckt and the second one is reference voltage generator for regulator and the third is single stage rectifier block. I have used 4-stages for the rectifier. I see regulated output of -0.5V when the rectified dc voltage is saturated to 1V.

author: Paul Price
author_rank: Super Contributor
timestamp: June 24, 2013, 03:07:49 pm
content: imho, it might be that your circuits are very innovative and quite a unique design., but I think you should google rectifier, power supply and regulator before drawing any more schematic drawings and then hope your creative ideas will achieve any practical electronic goal.It would also help to use a schematic editor to present your idea that does not punish a printer so much with so much black.

author: InterestedTom
author_rank: Regular Contributor
timestamp: June 24, 2013, 09:14:50 pm
content: from my experience the black background in schematic and pcb software is only there to reduce glare. Most will print a white background where a black one is displayed.

author: Paul Price
author_rank: Super Contributor
timestamp: June 25, 2013, 02:23:08 pm
content: Inks spills like blood at a guillotine convention if you just try to print the picture posted, and sometime you need to print the .png file displayed as a posted image to try to get some idea on what is going on to help the OP.
RED PITAYA BOM - Page 1
Forum section: electronics / projects

author: acontu34
author_rank: Newbie
timestamp: April 03, 2024, 08:51:52 am
content: Did you know where can I find the bill of material about RED PITAYA STEMlab 125-14 v1.0?I need it to perform a reliability analysis for research scope.

author: Kean
author_rank: Unknown
timestamp: April 03, 2024, 01:02:41 pm
content: I don't believe it has been published.The best info that is openly available is athttps://redpitaya.readthedocs.io/en/latest/developerGuide/hardware/125-14/top.html#schematicsIf you need more, then I suggest contacting the company and requesting it. It is possible that they may provide it under NDA depending on what you are doing.

author: kevin.gibbs
author_rank: Regular Contributor
timestamp: April 10, 2024, 01:47:26 pm
content: Maybe ask the developer?https://redpitaya.com/stemlab-125-14/