hybridfree/eevblog-posts huggingface dataset:
What's with the "Space Shuttle" marking on some cables - Page 1
Forum section: electronics / projects

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 29, 2022, 04:08:26 am
content: I have a few cables that are marked "Space Shuttle", although I don't think they're related to aerospace in any way. The really odd part is that some of the cables are SATA, a standard that didn't even exist for most of the Shuttle's service life. Is that marking just to fool beginners into thinking the cable is really high quality?

author: sleemanj
author_rank: Super Contributor
timestamp: June 29, 2022, 04:15:24 am
content: It's the name of the company that makes them, Space Shuttle Cables (Space Shuttle Hi-Tech Co., LTD.)http://www.spaces.com.tw/

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: June 29, 2022, 04:17:37 am
content: Quote from: NiHaoMike on June 29, 2022, 04:08:26 amIndicates the altitude it (and you) will reach when it blows up.

author: Stray Electron
author_rank: Super Contributor
timestamp: July 01, 2022, 02:37:01 pm
content: FWIW I have a whole box full of cables that came out of the space shuttles and none of them are marked "space shuttle" they're only marked with the usual meaningless numbers. But they are in bags with NASA documentation and most have large NASA marked paper tags attached directly to them by cloth string.The only time that I've seen a military or NASA item marked for system that it was going into is on a tape recorder that I have and it says "Built by the Leach Corporation for the Apollo Spacecraft". One of the other id plates on it says "Collins Radio" with more meaningless numbers. Collins was the prime contractor for the radio systems used by Apollo. Leach corporation was well known for making very high quality relays used in aircraft and they were a subcontractor to Collins Radio on the Apollo program.

author: exmadscientist
author_rank: Frequent Contributor
timestamp: July 01, 2022, 10:28:05 pm
content: Quote from: sleemanj on June 29, 2022, 04:15:24 amNot to be confused with (their nemesis? bitter rival? subcontractor?)Shiny Space Enterprise Co. Ltd., who produces... capacitors. And, I hope deep down in my heart, costumes for 1960s TV shows.(Incidentally they both appear to be decent suppliers.)My favorite off-brand vendor, however, remains T & A Brothers (who, naturally, make connectors... or was that hardware?). They seem to be harder to track down on the English internet, but certain pieces of test equipment get a lot of stuff from good ol' T & A.
What's wrong paralleling schottky diodes? - Page 1
Forum section: electronics / projects

author: Kokoriantz
author_rank: Frequent Contributor
timestamp: November 30, 2024, 04:23:44 am
content: I need low voltage drop SMD diodes for 300khz PWM with 5.5Ap current for low loss flywheel and low dissipation running with 48V.I did find from ST micro 5A60V for $0.5 that has 0.55V but I wonder if 5.5A at 95%PWM at 20Hz is acceptable.On the other hand, there is the very cheap SS510, I ordered 50pcs for $1.2. As the project is intended for DIY use only, I can ask the 3 paralleled diodes to be matched which also helps the heat to be scattered.

author: moffy
author_rank: Super Contributor
timestamp: November 30, 2024, 05:43:15 am
content: The negative temperature coefficient of diodes means that the one carrying the most current will heat more and carry more current etc. They need to be matched and thermally bonded together to prevent a single diode hogging the current.

author: CosteC
author_rank: Regular Contributor
timestamp: November 30, 2024, 07:41:09 am
content: I would parallel diodes in the same package - there is lot of dual diodes.Single devices - rather not. Testing and pairing is something I try to avoid.SK86C from Taiwan Semiconductor?PDS760-13 from Diodes inc?

author: Kokoriantz
author_rank: Frequent Contributor
timestamp: November 30, 2024, 09:13:55 am
content: Although both references are single diodes, the pds760 is a better choice than 50l60 and cheaper from Ali, $3 for 10pcs all Inc.I will run it hot so that at 4A, as I reduced to, it drops only 0.4V dissipating for a pair 1.6W and 3.2W for the 4 units in bridge.This solved my problem, thank you very much.

author: David Hess
author_rank: Super Contributor
timestamp: November 30, 2024, 09:42:32 am
content: Paralleling diodes can work however their negative temperature coefficient and differences in voltage drop and mean that they will not share current evenly. To help with this, mount the diodes in close proximity and match their forward voltage drops at a current close to their operating current.It is possible to calculate a derating factor based on thermal coupling between the diodes and differences in forward voltage drop, however somewhere between 60% and 80% is typical.Quote from: Kokoriantz on November 30, 2024, 04:23:44 amIt does help, but unfortunately the requirement to maximize thermal coupling conflicts with this. I would mount them as closely as possible to each other and rely on derating so there is still some benefit.
Whats wrong with this big RLC circuit ? Calc's or the sim ? - Page 1
Forum section: electronics / projects

author: MathWizard
author_rank: Super Contributor
timestamp: June 26, 2023, 07:15:36 am
content: I'm trying some T-Pi transforms of RLC circuits with phasors, and I get most of them right, but not this 1, and IDK what I'm doing wrong, or if it's the sim that's not giving ideal answers, and it's answer is not in the textbook.The goal was to find Zin and so Iin in the sim should match. I can do it other ways, but I didn;t bother yet, I did this 1 3 times.But if you're like me and like complex numbers, just look at the circuit, I wrote the values in there. I keep getting the same answers, but I don't see what I'm doing wrong, as I simplify the circuit.I'm assuming for Z's, the T-Pi transform would be just like with R's, and for element values A-B-C in a T, the Pi element value would be (AB+BC+CA)/(opposite element)I'm getting Zin=(1.385-j13.74) = 13.81ohms<-84deg, so I'd only get a current of 73mA for 10V, but the sim has 2.38Amps peakThe 1st 2 circuits work and are equiv, but then I used thermistors as symbols for lumped impedance's.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 26, 2023, 03:40:46 pm
content: Can you take a bigger screenshot so values are legible?Is this transient or steady state AC?Tim

author: MathWizard
author_rank: Super Contributor
timestamp: June 26, 2023, 07:58:20 pm
content: Oh I tried to post the circuit sim, it must have failed. It's just a fixed freq V source, so a phasor problem. Besides the 3 T-Pi transforms I did, it's just parallel impedances.Now, the server keeps saying it's times out when I try to post this, with the 7kB .asc file ??The book just gave imedances, I chose 2652.6HzSee if a another pic uploadsYup but still can't upload the .asc file ??

author: Benta
author_rank: Super Contributor
timestamp: June 26, 2023, 08:57:04 pm
content: EEVBlog has been wonky with .asc files the last days.Rename to .txt and redo. Cheers.

author: MathWizard
author_rank: Super Contributor
timestamp: June 26, 2023, 09:19:48 pm
content: Ok thanks. I must have a problem near the end, I made the other equivalent circuits with series RC and RL for the R+jX, and it stops matchingIDK, now I got the right answer, just some little mistake at the end Iin =2.399<40.77deg = 1.817+j1.566Zin=3.157-i2.723 = 4.17<-41deg

author: The Electrician
author_rank: Frequent Contributor
timestamp: June 29, 2023, 07:38:09 am
content: Quote from: MathWizard on June 26, 2023, 09:19:48 pmWhat textbook are you using?
Where Can I Buy 9-Conductor #22 tinned Solid Vinyl Sheathed Cable? - Page 1
Forum section: electronics / projects

author: SuzyC
author_rank: Frequent Contributor
timestamp: May 06, 2021, 12:26:47 pm
content: Several years ago, I was able to buy a used spool of about 30-yards of this kind of this off-white coloredunshieldedvinyl sheathed cable with9 #22 AWG solid conductorsat a hamfest. The cable is almost identical in appearance and diameter to LAN cable.The9-conductors within are not twisted pairs.I have been using it for wiring breadboards for almost ten years and it is so easy to strip(thin vinyl insulated conductors) and the plating of the individual conductors makes for long-lasting, easily inserted, low-resistance connections to breadboards.I am pretty surethe plating on the individual solid copper conductors is silver, but it might just be some bright metal alloy.Because I can cut each wire length to closely fit the connection distance, and that is has9-colors(black, brown, red, or,grn,blu, violet, gray, white..solid colors, no stripes) that allows me to so easily to dress and shape each connections and also that it allows me to so easily, (at a glance) trace or identify connections on a breadboard, I love this stuff.It was likely a cable used for insulation displacement point to point wiring in industrial equipment or intercom?Help! I am down to the last few feet!Does anyone know where can I get a spool of this again?

author: ajb
author_rank: Super Contributor
timestamp: May 06, 2021, 05:31:14 pm
content: Is there a reason you want that stuff instead of individual wires? There are a ton of places that sell kits of 5-10 spools of different color solid 22AWG wire specifically for breadboarding.
when datasheets bend the the facts to a point you have to wonder - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: November 16, 2017, 12:22:11 pm
content: So, I am looking at this nice little opamp. I'm checking the input offset just to be sure. So it's max 7mV at 25C, "typically" is varies by 7.0uV/C - don't forget the .0 just to clarify how significant that 0.1uV is - and then you see that actually at 85C it can be max 13mV, so you work out the actual max deviation with temperature and low and behold discover that next to that dead accurate 7.0uV/C (don't forget we are being accurate to 0.1uV) the max should say 100mV !!!!!! nice try ON Semiconductor:http://docs-europe.electrocomponents.com/webdocs/14b2/0900766b814b2dcf.pdf

author: Benta
author_rank: Super Contributor
timestamp: November 16, 2017, 12:53:44 pm
content: I wouldn't say they are bending the facts, rather that you are reading something into the specs that are not there.The average temperature coefficient of the input offset voltage is 7 uV/C.This means that the manufacturer measures the offset voltage at the highest and the lowest temperatures and divides the difference with the temperature span. It says nothing about offset voltage excursions in between, which can be larger due to non-linearity.It doesn't really matter which manufacturer, the datasheets all read the same.

author: Simon
author_rank: Unknown
timestamp: November 16, 2017, 12:58:07 pm
content: Yes i know all of the datasheets are pretty much the same. They omitted to fill in the max box and instead created a separate spec to say the same thing putting it in a different light which avoids saying that the temperature drift can be anywhere from 7 to 100uV, when you put those two number side by side you see the reality, when you just see 7mV at 25C and 13mV at Thigh you can assume it's the 125C or 150C the part is rated for not 85C

author: jaromir
author_rank: Unknown
timestamp: November 16, 2017, 01:07:17 pm
content: Datasheet states the offset is 5,7 or 9mV (depending on which particular chips you have) at Tmax. Period. That is the guaranteed value you have to take into account.If you want a part with specified tempco of offset, you have to search somewhere else.
When does the standard resistively biased Class-A stop working? - Page 1
Forum section: electronics / projects

author: ezalys
author_rank: Frequent Contributor
timestamp: March 25, 2022, 01:22:27 pm
content: Suppose I want a DC coupled amplifier with a -3 dB roll off of maybe 600 MHz. It’s a bit tempting to buy a nice HEMT and resistively bias it as a standard common source Class-A with source degeneration. Clearly though, most RF amplifiers are not designed this way. At what frequency does this naive design tend to stop working, and what can be done to push it up to higher frequencies? If this is a bad strategy, does anyone have any examples of common source Class-As that are DC coupled and have good bandwidth up to 600 MHz or advise how to do so? I have effectively infinite power and thermal budget, if this is a concern.Also by DC I should be clear and say I mean 100 Hz. I have no qualms with a somewhat complex bias servo for the gate, if the 22 uF needed into 50 ohms is unavailable with a high enough SRF. For the drain bias I have no idea how you’d couple it down to 100 Hz and keep it matched to 50 ohms.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 25, 2022, 05:07:16 pm
content: Easy -- use shunt feedback instead of series. A common sight is a resistor from D-G (maybe with coupling cap), as "neutralization", but it's not actually neutralizing anything, it's just reducing the gain to improve stability. Which comes with reduced distortion (it's negative feedback!), and at the expense of whatever power is dissipated in it (a bit of an embarrassment for power amps using this, needing big fat power resistors).Since you're DC coupling, this also serves as DC stability, i.e. as part of the gate voltage divider.Do you really need much? Or is this at modest power levels so it's just not something jellybeans can serve? I made a wideband amp a long time ago,which despite the rather loose layout, rolls off in the 600MHz range using BFR92AWs. (Although not this exact layout, I did two variants; one with peaking components and some tweaks to stabilize the poor layout, the other with more of a, whatever that thing is called*, architecture.)*It's cascaded transconductance and transresistance amplifiers, there's a name associated with that that I can't remember.Tim

author: ezalys
author_rank: Frequent Contributor
timestamp: March 25, 2022, 10:54:41 pm
content: I want maybe 10 volts into 50 ohms — so it needs to be pretty beefy.

author: mawyatt
author_rank: Super Contributor
timestamp: March 26, 2022, 12:23:06 am
content: 10 volts peak to peak or rms?Best,
nevermind I had it right - Page 1
Forum section: electronics / projects

author: MathWizard
author_rank: Super Contributor
timestamp: March 25, 2025, 11:27:27 pm
content: nevermind, I did forget 1 thing again

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: March 26, 2025, 07:41:33 am
content: Hello, do you have a question to ask here?
When stepper start to run I can't debug anymore - Page 1
Forum section: electronics / projects

author: Yaroooo
author_rank: Regular Contributor
timestamp: October 20, 2020, 09:28:08 am
content: I've a problem on a board that's composed buy MCU + Stepper Driver. MCU is a 32bit PIC series from Microchip. When debugger is connected to the board and program runs with stepper disabled, there's any problem. But at the moment when motor starts to move, debugger disconnects with an error message. The board wasn't developed by me, but I'd like to solve this problem to avoid a complete redesign of PCB. Programming strip is routed on Top of the board and connected to PIC KIT 4 . What do you think I can try to suppress noises on programming lines? A resistor on line or a ferrite choke on cable?

author: RoGeorge
author_rank: Super Contributor
timestamp: October 20, 2020, 12:05:57 pm
content: I would start by putting ferrite beads on each wire coming from the programmer, right near the PCB connector side, maybe some ferrite glandules, too, or pass the cables through donnut ferrite cores, whatever available, as seen in the first 5 mins hereThe idea is the high frequencies spikes will be reflected back by the ferrites, so the ferrite should be put at the noise source side of a cable. Some chokes on the motor wires might help, too, if possible.Also decoupling caps on the power lines of the MCU, right near the MCU pins, are a must, but I'll assume the board already has proper decoupling. Beware of ground loops, too, the GND should be connected in only one point, preferably near the MCU GND pin.Series resistors on the programming wires (or even in series with the motor wires if allowed) might help, too, but those are mostly to dampen the reflections and ringing, they won't stop much of the spikes getting into programmer.You didn't said the error. If the error is on the USB side, and not in the programmer, and if the above measures does not solve the issue, then you might need a USB galvanic isolator.
Where are standard component sizes defined? - Page 1
Forum section: electronics / projects

author: alan.green@gmail.com
author_rank: Unknown
timestamp: January 15, 2019, 04:22:31 am
content: I've had reason to be working a couple of land patterns that are suitable for multiple component sizes, and I got to wondering... which organisation is it that defined the standard component sizes?For example, most manufacturers are pretty much in agreement about what "SOT23" means. Did some industry group define that? Or is it a standard that emerged as multiple manufacturers reused the package size?Although I can find somehelpfuldocumentationfor designing land patterns that will work with a variety of packages, I can't find a reference to an original specification for any given package size.The closest I have come isJEDEC, but that seems to be a more recent effort to document what exists rather than the original definition, and they have completely new names for surface mount parts compared to what I find at say, Digikey or Element14.Is anyone able to shed some light on this topic? All pointers welcome.
Where can I buy a USB 3.0 connector that plugs into the motherboard header - Page 1
Forum section: electronics / projects

author: niconiconi
author_rank: Frequent Contributor
timestamp: January 13, 2021, 09:23:40 am
content: I want to make a riser board that plugs into the USB 3.0 pin header on the computer motherboard, so I need a right-angle mating connector. I searched the web and found many vendors selling such boards (see picture), so it definitely exists but I don't know where to look for that plug... Does anyone know the part number of that connector?

author: Gribo
author_rank: Frequent Contributor
timestamp: January 13, 2021, 04:13:59 pm
content: This is usually (few motherboards have a different header) a 2mm pitch connector. It is available from many different vendors.
Where can I buy an "open frame" inverter - Page 1
Forum section: electronics / projects

author: The_Unreasonable_Man
author_rank: Newbie
timestamp: April 14, 2015, 07:15:20 pm
content: I am building a project and I am looking to embed a 12V-120VAC inverter into it.How would someone go about sourcing a bare inverter circuit board without an enclosure or anything. I would like to place this into a custom enclosure as part of a prototype invention. I have searched up and down and I haven't been able to find anything of the sort, I've been able to find plenty of open frame dc-dc converters but no inverters.Does anyone know what I might be doing wrong?Thank you,-Mike

author: calexanian
author_rank: Super Contributor
timestamp: April 14, 2015, 07:47:47 pm
content: You will most likely not find one easialy due to safety concerns. I would ask myself if I realy needed an open frame one. The thermal characteristics of one typically require the enclosure to properly route cooling air. I would use a commonly available one and perhaps modify it to fit my needs.

author: DanielS
author_rank: Frequent Contributor
timestamp: April 14, 2015, 11:55:08 pm
content: When line-powered stuff is available off-the-shelf, it will usually be designed to pass (or fake) most safety and EMI certifications as-is, which usually means an enclosure of some sort.If you want something without an enclosure, you would need to custom-order from OEMs/ODMs and take responsibility for the PSU's safety and EMI certification as integrated in your finished thing.

author: Smokey
author_rank: Super Contributor
timestamp: April 15, 2015, 06:06:03 am
content: Just buy an inverter and throw away the case.

author: Ice-Tea
author_rank: Super Contributor
timestamp: April 15, 2015, 06:42:46 am
content: Farnell:http://be.farnell.com/webapp/wcs/stores/servlet/Search?st=AC%2FDC&catalogId=15001&categoryId=700000004432&langId=32&storeId=10154DigiKeyhttp://www.digikey.com/product-search/en?pv183=7548&FV=fff40009%2Cfff80229&k=AC%2FDC&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=500

author: rdl
author_rank: Super Contributor
timestamp: April 15, 2015, 07:47:16 am
content: He wants DC to AC, an "inverter".Buying off the shelf is definitely the way to go.Possible problems with buying one off the shelf and removing the case:SafetyCase is used as heat sinkCase is used to direct cooling air flowI don't really see why leaving the case on would be a big problem, it's not like it takes up a lot more space.
Where can i find a good source of cheap RF metal cans in standard sizes - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: December 08, 2020, 12:51:55 am
content: I'm in need of a surface mount RF metal can for a project (qty 100).The size isn't too critical I will design it to fit what is out there. (maybe 20x20x3mm, something like that.)You can get metal cans from digikey but they cost like $1+ in 100 qty.Compared to like 7-15 cents from china, but using Alibaba adds extract time/complexity/shipping delays etc.Are there any online stores that fit in between those two options.I'm happy to pay like $0.35 each for something in a standard size from a decent online store with a spec sheet.Any recommendations appreciated.

author: bob91343
author_rank: Super Contributor
timestamp: December 08, 2020, 01:41:54 am
content: Perhaps surplus? I have salvaged all kinds of interesting stuff from old gear. Or you can build your own.

author: Psi
author_rank: Super Contributor
timestamp: December 08, 2020, 08:38:21 am
content: Quote from: bob91343 on December 08, 2020, 01:41:54 amTo slow, I need to order them.

author: Psi
author_rank: Super Contributor
timestamp: December 08, 2020, 10:15:54 am
content: I've found some in stock at Arrow that might be suitable and price is ok.https://www.arrow.com/en/products/2118709-2/te-connectivity?q=2118709-2
Where can I find a high frequency crystal oscillator? - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: February 20, 2015, 12:27:20 am
content: I was wondering in what electronic devices I might have at home could I find a crystal oscillator in the 20 Mhz range to test my new oscilloscope's bandwidth by checking the rise time on a square wave.

author: dannyf
author_rank: Super Contributor
timestamp: February 20, 2015, 01:36:37 am
content: 20 - 32Mhz crystals are fairly common.36Mhz or 48Mhz+ ones are rare.

author: TiN
author_rank: Super Contributor
timestamp: February 20, 2015, 02:26:07 am
content: If you happen to have broken VGA card, they usually have 27MHz

author: lincoln
author_rank: Regular Contributor
timestamp: February 20, 2015, 05:33:04 am
content: keep in mind not all oscillators will have a square wave out put, many have clipped sine wave. To test the bandwidth you don't necessarily need high frequency, just a fast rise time on the square wave.

author: jwm_
author_rank: Frequent Contributor
timestamp: February 20, 2015, 05:39:38 am
content: I have about 100 20mhz stand alone oscillators. I can send you a couple for the cost of a stamp. Will throw in a 48mhz one too.

author: tggzzz
author_rank: Super Contributor
timestamp: February 20, 2015, 11:16:00 am
content: For checking the risetime, a crystal oscillator is unnecessary and, depending on the oscillator may be wrong.The simplest technique is to use a 74X14 as an RC relaxation oscillator that drives one or more 74X14 or 74X04 in parallel. Good choices are NC7SZ14M5X or 74LVC1G14, which should achieve transition times of ~1ns.
Where can I find linear voice coil actuators online? - Page 1
Forum section: electronics / projects

author: pmankow
author_rank: Newbie
timestamp: August 02, 2011, 03:50:53 pm
content: Does anyone know where I can find linear voice coil actuators online with prices? Everything seems to be industrial with no price information. I need to size up and compare product/price and don't have time to waste contacting the manufacturer for price quotes every time.Thank you.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: August 02, 2011, 05:24:47 pm
content: BEI Kimco is the major supplier. They're basically a high priced industrial item and AFAIK you won't find on-line pricing. Depending on your needs, you can also make 'em. A coil plus a good neo magnet and maybe some iron structure to direct the field.
Where can I find open source RAM sticks? - Page 1
Forum section: electronics / projects

author: mrburnzie
author_rank: Regular Contributor
timestamp: May 22, 2023, 08:44:22 am
content: Did anyone have any luck finding RAM stick that are open source?Thanks.

author: tunk
author_rank: Super Contributor
timestamp: May 22, 2023, 01:56:52 pm
content: Never heard about this.The only hacking with memory I've heard about is this - do a web search for: dimm spd hack

author: magic
author_rank: Super Contributor
timestamp: May 22, 2023, 02:48:15 pm
content: You mean, like a PCB design that you can fabricate and solder DRAM chips onto?Why would anyone want that if ready made RAM sticks are easily available, likely cheaper, and it's not clear how they could be improved in any way?

author: mrburnzie
author_rank: Regular Contributor
timestamp: May 22, 2023, 06:27:05 pm
content: I want to look at the solution how the ddr3 topology is done and maybe get a glimpse into how they came to the calculations with the impedance etc etc... educational purposes.But I guess other dev kits that have ddr3 will be more than enough.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 22, 2023, 07:58:04 pm
content: https://www.jedec.org/standards-documents/focus/memory-module-designs-dimms/DDR4/260-pin%20Unbuffered%20SODIMMs

author: Haenk
author_rank: Super Contributor
timestamp: May 23, 2023, 04:59:15 am
content: These are not free or Open Source.However the easiest and cheapest way to have a working and compliant design.

author: nereye
author_rank: Newbie
timestamp: May 24, 2023, 03:12:36 pm
content: This is slightly off topic (since it’s for Static RAM) but in case somebody finds it relevant, an open source (S)RAM compiler:https://openram.org/
Where can I find the uCurrent schematics? - Page 1
Forum section: electronics / projects

author: schlank
author_rank: Newbie
timestamp: January 16, 2014, 02:26:42 pm
content: Hi!I want to order some PCBs of the OLD uCurrent device. I already ordered all the parts I need to build ten items (they will be used at the university (physic department), no commercial use/purpose) but unfortunately now the Altium files are gone due to the new uCurrent GOLD project page.Can someone tell me where to find the OLD Data OR is there a chance to find the layout for eagle?Thanks for your help,Schlank

author: tszaboo
author_rank: Super Contributor
timestamp: January 16, 2014, 02:40:29 pm
content: http://alternatezone.com/electronics/ucurrent/uCurrentArticle.pdfAs published in the April 2009 issue of Silicon Chip Magazine.

author: schlank
author_rank: Newbie
timestamp: January 16, 2014, 02:48:59 pm
content: Hi!Thanks but I need the Altium Layout Data!YoursSchlank

author: tszaboo
author_rank: Super Contributor
timestamp: January 16, 2014, 04:19:03 pm
content: Oh, you are right. I thought you already have the PCB and you need a schematic.I have a local copy for rev 3, I can send it to you by mail.I would upload it somewhere, but I believe that would violate somehow Dave's legal stuff. Send me a PM with your e-mail address.No actually the topic title is schematic

author: BurtyB
author_rank: Regular Contributor
timestamp: January 16, 2014, 04:48:37 pm
content: Looks like they are onhttp://www.eevblog.com/projects/ucurrentoriginal/?
Where can I find this battery contact? - Page 1
Forum section: electronics / projects

author: Jan_G
author_rank: Newbie
timestamp: April 19, 2017, 07:36:51 am
content: Hi everyone!I'm looking for a receptacle like the one shown in the pic.I tried so many key words like battery connector, blade receptacle pcb, battery terminal pcb and any combination of those in google, mouser and digikey.The picture shows the internals of a Makita battery.I have a project where I could use such robust contacts, that have a lot of play/lash/clearance. It is for an assembly that has to be mounted and dismounted regularly. We will have mechanical guides but I fear that standard battery connectors have not enough lash because they are quite small compared to the assembly. And those Makita connectors provide good guid for the blade that goes into the receptacle.Does anyone have an idea where I can find that thing or at least how it is called?Thanks guys!Jan

author: martinator
author_rank: Contributor
timestamp: April 19, 2017, 09:54:43 am
content: I think it's a type/variation on a Pluggable Busbar Connector. Expensive.

author: Jan_G
author_rank: Newbie
timestamp: April 19, 2017, 11:24:37 am
content: Hi!Thank you, they really look very similar and they ARE expensive. Wow!This lead me to crown clips, also by TE, but they don't provide that good of a guide for the counter part, they are almost the same width all the way.I found cheap replacement boards for the Makita one with the same contacts, so they have to be available somewhere.I will go on with my search.PS:We will try now with Harwin S7061-42R earthing contact.We will have two PCBs, one with the Harwin spring and one with SMD Pad as counter part.
where can i find this? - Page 1
Forum section: electronics / projects

author: phenol
author_rank: Regular Contributor
timestamp: October 17, 2017, 06:50:42 pm
content: this , shall i call it esd brush, is stuck on the door of a printing device. there is an adhesive tape on the bottom side and the top side is conductive and made of what looks like fine metallic fibers/strands. I am struggling to find the correct terminology for it and hence suppliers.

author: IDEngineer
author_rank: Super Contributor
timestamp: October 17, 2017, 10:44:55 pm
content: Google search instantly reveals:http://www.staticbrush.com/http://www.est-static.com/https://precisionbrush.com/custom-brushes-antistatic-brushes...and dozens of others. I simply searched on how you described it.Hope this helps!
Where can I get 3 prong plug blades (just the blades) ? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: February 19, 2017, 06:20:13 pm
content: I have been asked to develop a Wall Wart type device and need to find a supplier for the prongs (just the prongs). I did a Digi-Key search with no luck, perhaps I used the wrong search terms?If anyone can point me in the right direction it would be appreciated. I need both USA, European and Asian styles. I will need them in quantity.

author: Avacee
author_rank: Unknown
timestamp: February 19, 2017, 06:31:52 pm
content: These any use?https://www.alibaba.com/product-detail/earthing-pin-plug-insert_533496060.html?s=phttps://www.alibaba.com/product-detail/european-pin-plug-connector-3-Pin_1987916012.html?s=phttps://www.alibaba.com/product-detail/eu-non-earthing-2-pin-plug_533354928.htmlMaee by:http://yysr-industrial.en.made-in-china.com/If you need enough they'd probably sell you just the pinsThe Keyword used in the UK would be "pin" instead of "prong"For info I found those narrowing the search to "earthing pin" - figuring that in the UK the earthing pin is a slightly different spec to the live+neutral so it may be sold individually - stuffed if I can help for US socketsHope this helps and good luck!

author: elecman14
author_rank: Unknown
timestamp: February 19, 2017, 10:26:26 pm
content: You may want to look through:https://www.digikey.com/products/en/power-supplies-external-internal-off-board/accessories/131These are not three prong but you should look at this style:https://www.digikey.com/product-detail/en/phihong-usa/RPBAG/993-1053-ND/2384505The trick would be finding a mating enclosure.
Where can I get 3D model of DRG-02 - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: March 06, 2023, 09:03:23 am
content: Hi,I have DIN Rail Mounts that has DRG-02 markings on them I want to design a PCB and some sheet metal with them, so I need 3D model of this rial mounts, There was nothing in 3dcontentcentral, so do you know some other website that has them?
Where can I get  a custom connector made - Page 1
Forum section: electronics / projects

author: TRS-90
author_rank: Regular Contributor
timestamp: October 21, 2016, 11:04:48 pm
content: I need to make an adapter for a proprietary connector that I have the pinout for.It is an edge connector for a monitor and I need the adapter to have a VGA port a headphone jack and 3 Potentiometers for Volume, Contrast and Brightness attched the the 5 volts out on the internal PSU of the monitor.Is there anyone who can make such a connector? If so, then let me know.Thanks,TRS-90
Where can I get cable assemblies like this? - Page 1
Forum section: electronics / projects

author: rea5245
author_rank: Frequent Contributor
timestamp: March 10, 2020, 04:50:54 pm
content: Hi,I just bought an LA104 handheld logic analyzer and it comes with a cable assembly with a 0.1" rectangular connector on one side and female Dupont wires on the other, i.e.:Is there a place to buy these off-the-shelf, with different numbers of wires? I'm not even sure what to Google for.Thank you,Bob

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 10, 2020, 05:33:37 pm
content: https://www.ebay.com/itm/40PCS-Dupont-10CM-Male-To-Female-Jumper-Wire-Ribbon-Cable-for-Arduino-MF/172278063376?hash=item281c92a110:g:ty0AAOSwD8Bc7Ipphttps://www.ebay.com/itm/To-Female-10cm-Female-To-Female-Arduino-Dupont-Line-Jumper-Wire-Ribbon-Cable/283796218232?var=585218672142&hash=item421392a178:m:mStCm9CEy3l7GNNa5_1zfeg

author: rea5245
author_rank: Frequent Contributor
timestamp: March 10, 2020, 05:41:18 pm
content: Thanks, but I'm looking for a single rectangular connector on one end, not separate individual connectors.- Bob

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: March 10, 2020, 06:27:37 pm
content: In a pinch, you can use the individual connectors, arranging them how you want, attached to a header, and then glue them altogther. Hot melt glue will work. we do that alot around here.

author: hexreader
author_rank: Frequent Contributor
timestamp: March 10, 2020, 06:41:29 pm
content: There are many options:Buy the ribbon with single housings, remove the unwanted single housings by lifting the plastic tab, replace with multi-way housings like these...https://www.technobotsonline.com/cable-assembly-housings.htmlBuy ready made leads like these...https://www.technobotsonline.com/pre-crimped-wire-f-f-30cm-50-piece-rainbow-mix.htmland slot into whatever muti-way housing you choose. All combinations male/female available in different lengths.I have linked to a UK supplier, but all major suppliers have housings. Pre-made leads are harder to find.You can make your own leads if you can find the right crimp tool, but this is very fiddly, time consuming and unreliable if not done skilfully.
Where can I get small folded aluminium enclosures in the UK? - Page 1
Forum section: electronics / projects

author: smjcuk
author_rank: Frequent Contributor
timestamp: May 06, 2015, 09:43:33 pm
content: I just emptied my local Maplin (UK) of their last two small folded alu enclosures as they were £1 each due to being discontinued!Short of driving all round the country harvesting them, does anyone know a reliable source of them or an alternative solution? They appear to have been universally replaced with extruded/cast Hammond cases here in the UK which are a bit overkill for small RF circuits and damn expensive.Looking for something like ones in the following project:http://oz2oe.dk/radio/bf981/981.htmlI'm not buying sheet alu and folding it or making my own boxes out of PCB offcuts either

author: kjs
author_rank: Regular Contributor
timestamp: May 06, 2015, 10:27:37 pm
content: these look like Teko boxes to me....Try this:https://www.reichelt.de/Teko-Alu-Gehaeuse/2/index.html?ACTION=2&GROUPID=5201&SHOW=1&OFFSET=16&or this:http://www.conrad.de/ce/de/brand/TEKO?queryFromSuggest=truethey ship inside Europe...TEKO UK:http://www.teko.co.uk/en/products/product-group/AL/serie/6

author: langwadt
author_rank: Super Contributor
timestamp: May 06, 2015, 11:13:19 pm
content: this instead?http://www.technobotsonline.com/electronics-hardware/boxes/diecast-enclosures.html

author: smjcuk
author_rank: Frequent Contributor
timestamp: May 07, 2015, 06:11:09 am
content: Quote from: kjs on May 06, 2015, 10:27:37 pmThats exactly what I want. Thank you

author: kjs
author_rank: Regular Contributor
timestamp: May 07, 2015, 06:22:20 am
content: welcome!Sorry but I just recognized that I gave you the German pages. Switch to English and search for TEKO and it's easier to read for you.......

author: smjcuk
author_rank: Frequent Contributor
timestamp: May 07, 2015, 06:38:08 am
content: No worries
where Can I get the B50610C1KMLG Datasheet - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 04, 2020, 09:01:11 am
content: Hi,I'm designing with the Gowin FPGA and they have used this B50610C1KMLG from broadcom as the Ethernet PHY,Gowin has published the schematics for their eval board, But the problem with this part is that there is no datasheet for it, the question is where can I get the datasheet? is there a chinese or russian site containing the Data sheet, Also if there is an altium lib for this part, it would be nice too.

author: javad2040
author_rank: Contributor
timestamp: January 04, 2020, 09:45:45 am
content: hi aliI have the B50610 ic datasheet and uploaded it.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 04, 2020, 11:54:11 am
content: Thanks javad2040
Where can I get the female socket for the Dualshock 2 controller? - Page 1
Forum section: electronics / projects

author: matrixofdynamism
author_rank: Regular Contributor
timestamp: June 09, 2015, 08:42:48 pm
content: For a person designing a project which shall make use of the dualshock 2 controller as found on the PS2 console itself, where can one find the female end of the connector as is found on a PS2 console? I am looking for a part that can be soldered onto a PCB. Is the only really to find a PS2 console and cut it out of it?

author: nitro2k01
author_rank: Frequent Contributor
timestamp: June 09, 2015, 09:08:28 pm
content: There are (3rd party obviously) USB adapters that you can get to get a connector. Some of them, like the one below, are just a USB cord going into a female connector. I would be very surprised if you didn't find that the connector is soldered to a PCB internally in that one, and that the connector is a separate piece of plastic from the rest of the case mold.http://www.gamebaz.com/?a=i&i=22849#.VXdVENKqpBcEdit: Another model where this is clearly the case. Not sure if I'd trust that site, but that's a different issue.http://www.buyincoins.com/item/604.html#.VXdWCNKqpBc

author: slateraptor
author_rank: Frequent Contributor
timestamp: June 10, 2015, 05:35:54 am
content: If you don't like the idea of salvaging components, might I suggest "dongling"...Using modified controller on PS2:------------[>>][>>]----Using modified controller on project:------------[>>][>>][Custom PCB]This way, your choice of interconnect is appreciably broadened while still maintaining useability on OE.Reminds me of college days when I got really excited to learn that Parallax manufactured sexy NES sockets to compliment my FPGA hardware emulation project,only to end up botching the PCB footprint on first iteration. Ended up dissatisfied with a wired controller and redesigning for Wiimote+embedded Bluetooth for a much sexier wireless (and still true to Nintendo) human interface.
Where Did It Go? Or Only Six Pings out to the Indian Ocean? - Page 1
Forum section: electronics / projects

author: bench_knob
author_rank: Regular Contributor
timestamp: April 09, 2014, 05:56:45 am
content: Interesting reading and offers the code too:www.fastcolabs.com/user/conor-myhrvoldbench knobps...disable js to eliminate the flashy-blinkie ads...
Where do I begin to figure out why this doesn't work ? - Page 1
Forum section: electronics / projects

author: Hextejas
author_rank: Frequent Contributor
timestamp: May 28, 2019, 12:59:56 pm
content: I built this field strength meter on a breadboard and I need guidance to figure out why it doesn't work. Where in the circuit to take readings, etc. The power on LED comes on but that's it.I tested it by having it near my radio as it pressed the transmit button.Thanks.

author: rstofer
author_rank: Super Contributor
timestamp: May 28, 2019, 01:45:16 pm
content: Check for 5V at the output of the 7805L (the junction between C3 and R2 relative to Gnd or the (-) side of the battery.Check for 5V on pin 7 of U1Check for any output voltage on pin 4 of U1.Wiggle pot R6 and see what happens to the output of U2A.Check the voltage on C6Disconnect the LED Voltmeter and take the measurement with you DMM.

author: virtualparticles
author_rank: Regular Contributor
timestamp: May 29, 2019, 12:19:19 am
content: The AD8307 will output 0 volts at -84 dBm in and 25mV per dB above that level. So 2.1 V at 0 dBm for instance. The actual RF sensitivity will vary quite a bit depending on what sort of antenna you use and will vary with horizontal or vertical attitude depending on the polarization of the received signal. The LM358 is configured to provide a gain to that output of 0 to 0.323 (2.2/6.depending on the position of the 100k pot. So with 0 dBm in you should see 0.678V with the 100K pot at the top. I'm not sure what the "LED Voltmeter" business is all about but you can just take the output of the LM358 into a voltmeter for your readout. You can create an arduino based voltmeter with an LCD display for this or just purchase one on Ebay.It's quite difficult to predict the amount of RF power that will be coupled to this circuit from the antenna. That depends on the gain of the antenna at that frequency. Usually a circuit like this is just fed with an electrically short "spike" which is excited by the electric field of the EM wave. So calibrating this will be a challenge but you should be able to see the difference between RF and no RF.

author: Datman
author_rank: Regular Contributor
timestamp: May 29, 2019, 07:55:43 am
content: It's a power meter, more than a field strength meter...Try lowering the 6k8 resistor to 100 ohm, increasing gain. You could have to adjust offset.
Where do I buy iPod 30 Pin Dock Connectors? - Page 1
Forum section: electronics / projects

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: September 11, 2020, 07:02:20 am
content: So I'm designing a product that uses an male ipod dock connector, to (shockingly, I know), connect to an ipodAs these are legacy devices but are gaining back popularity from flashmods, etc, the docking connectors are difficult to find.I bought some breakout boards for prototyping fromhttps://elabbay.myshopify.com/products/apple-30m-bo-v1ac-apple-30-pin-male-plug-breakout-board-compact-typeBut I contacted them and they seem to have the same issue as I do.The connector shown here is all I need:Does anyone know where I'd be able to source these connectors from? Would mouser/digikey/arrow have them? What on earth do I search to find this elusive connector?They've got to be somewhere... I'd buy USB cables and rip the connector out but they're moulded to not have the pins I need...Apologies if this post comes off as a fetch quest, but I genuinely don't know what to search for to track these things down...

author: MosherIV
author_rank: Super Contributor
timestamp: September 11, 2020, 07:40:46 am
content: As far as I know they are not available from the listed electronics distributors.Apple deliberatley choose or design things to stop people/competitors from interfacing to their stuff.The last time (8/9 years ago) I was involved with developing for apple kit, the source for special connectors was direct from manufacturer in China. No idea who/how to find them, one of my colleagues dealt with that (I do software). Needless to say, when dealing with manufacturer if quantity is low they are nit interrested.

author: oPossum
author_rank: Super Contributor
timestamp: September 11, 2020, 09:17:13 am
content: They where made by JAE and are a variant of a JAE DD1 connector. Part # DD1P030MA1 for example looks like it will work, but is keyed differently.
Where do I find information about image sensors? - Page 1
Forum section: electronics / projects

author: Alexandros81
author_rank: Regular Contributor
timestamp: June 20, 2020, 11:12:03 am
content: Hi!I was thinking of creating a project using the ov2640 image sensor. (using a module)Where can I find information on image sensors in general?thanksAlexandros

author: TimFox
author_rank: Super Contributor
timestamp: June 20, 2020, 03:03:06 pm
content: Google returns 55 million answers for "image sensor tutorial". The nine entries on the first page all look useful.

author: mark03
author_rank: Frequent Contributor
timestamp: June 20, 2020, 03:37:29 pm
content: Image sensors in general? Textbooks.OVxxxx sensors in particular? Like how to write a driver and make them work? There may in fact be a zillion google hits (I haven't checked), but the reality is that these sensors are notoriously un- or under-documented. If you do not represent a mega-corp with large purchasing volumes, you can forget getting any help from Omnivision. Best to stick with the most popular (and oldest) models which are fairly well understood. Fortunately for you, I believe the OV2640 falls into that category.

author: F99
author_rank: Newbie
timestamp: October 06, 2020, 08:58:14 am
content: Hi!In fact, I also would like to have more information than the datasheet is willing to give. I already know the source from igrr about the esp32-cam-demo on github. But he uses initialization preocedures including undocumented registers.Is someone reverse engineering this?I recently ordered esp32-ov2640 modules that have a primitive and slow image written on it, but when I try the popular arduino sketch or the igrr sample, it won't work properly.Any help appreciated!regards, F99
Where do I find thin copper strips? (rectangular wire) - Page 1
Forum section: electronics / projects

author: Glenn0010
author_rank: Regular Contributor
timestamp: February 16, 2024, 01:47:25 pm
content: Hi all,I'm looking for thin copper strips/ rectangular wire, ideally in the range of 0.1 to 0.3 mm thick and 2-4 mm wide. Had a search but can't seem to find a supplier. I need this for a planar coupled inductorDoes anyone have an idea of where I could find this? Bonus points if it supplies to the UK.I have a 130W C02, 10570-10640 nm laser cutter available, but don't think this is ideal for cutting copper. But may try if I can't find what I need.Cheers Glenn

author: Andy Watson
author_rank: Super Contributor
timestamp: February 16, 2024, 04:58:39 pm
content: https://www.wires.co.uk/cgi-bin/ss000001.pl?page=search&SS=tape&PR=-1&TB=O&ACTION=Go%21If that doesn't work, go here and search for "tape"https://www.wires.co.uk/

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: February 16, 2024, 05:37:20 pm
content: Maybe you can find a local jeweler with a Durston or similar rolling mill. They work great for rolling round copper wire into flat wire.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: February 16, 2024, 05:54:45 pm
content: search under flat motor or transformer copper wire in aliexpressQuote from: Glenn0010 on February 16, 2024, 01:47:25 pm

author: calzap
author_rank: Frequent Contributor
timestamp: February 16, 2024, 06:09:40 pm
content: Look for copper foil tape on Amazon and elsewhere. Cut with scissors or tin snips.Mike

author: Glenn0010
author_rank: Regular Contributor
timestamp: February 16, 2024, 07:09:32 pm
content: Hi All,Thanks very much for your replies! They've all been very helpful and should sort me out!