hybridfree/eevblog-posts huggingface dataset:
Where to get a connector for this? - Page 1
Forum section: electronics / projects

author: mitpatterson
author_rank: Regular Contributor
timestamp: April 23, 2014, 08:45:56 am
content: Ok so me and a friend are doing some experimenting and need to get a connector for this card. I've never shopped for this type of connector(i'm used to .1" headers). I know this is a card edge connector. The thickness is about as thin as they go(closest digikey has listed is 0.031"(0.79mm). But the problem is in that size they don't have the right pitch. They only have 2 sizes. 0.020"(0.5mm) or 0.100"(2.54mm). I ordered a sample of the .020" and its not the right size, way too small.Anyone have any leads of where i might find one? or does this look custom? Here is a scan of the card with a scale behind it. The scale may not be 100% but is pretty close. Its on a mm grid with larger marks at 1cm. The best guess i came up for for the thickness of each pin is about .66mm. But like I said I've never shopped for this type of connector so i don't really know what "standard" numbers are.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: April 23, 2014, 09:39:33 am
content: Quote from: mitpatterson on April 23, 2014, 08:45:56 amThe readability of the scale of the image together with your description is kind of terrible. Is it a 1 mm grid with longer marks at 5 mm, or a 2 mm grid with longer lines at 10 mm? I realized that there are two lengths of longer marks, and a 0 rearing its round butt in the cutout, so it must be the former, but it's not exactly crystal clear from the image and description.The pin pitch appears from the picture to be slightly wider than 1 mm pitch. This may not all be the printer's fault, however. You may be dealing with a .04" pitch rather than a 0.0394" (1 mm). From a quick measurement of the image, I'm finding 15 of the pins on the right header (as seen in the image) to be about 215 pixels wide whereas 15 mm is about 208 pixels. This gives a ratio of 215/208=1.0288 or so. On the other hand, .04"/1 mm=.04"/0.0393701"=1.015999 or so. So watch out!(Mutters something about making USA switch to metric.)

author: mitpatterson
author_rank: Regular Contributor
timestamp: April 23, 2014, 09:43:29 am
content: Quote from: nitro2k01 on April 23, 2014, 09:39:33 amSorry, it has short lines at 1mm, medium lines at 5mm and longer lines at 10mm. Hows that?So are the numbers you gave any standard widths you can find for a thin board like this?

author: AmmoJammo
author_rank: Frequent Contributor
timestamp: April 23, 2014, 10:01:33 am
content: looks like 1mm pitch to me?

author: mitpatterson
author_rank: Regular Contributor
timestamp: April 23, 2014, 02:38:48 pm
content: 1mm pitch it is. I did a bit of searching looks like a PCI Express x1 connector...only issue is thickness.. but i went ahead and ordered a connector and will just sandwitch 2 boards for thickness.

author: lapm
author_rank: Frequent Contributor
timestamp: April 23, 2014, 04:04:55 pm
content: Looks like card edge connectors, at least digikey seems to have 1 mm pitch ones too.. Maybe you can give them a try...
Where to get a hybrid IC xrayed? - Page 1
Forum section: electronics / projects

author: rfdes
author_rank: Regular Contributor
timestamp: June 10, 2017, 01:37:06 pm
content: Does anyone have an economical place to take a hybrid IC to have it xray'd? I was thinking of approaching my dentist to see if he would do it but I don't know how well it would work.Any suggestions? I know there are high $$$ places that charge by the hour for such tasks but that is not good for the hobbyist.ThanksJim

author: daqq
author_rank: Super Contributor
timestamp: June 10, 2017, 03:39:03 pm
content: See:https://hackaday.com/2013/01/09/in-depth-look-at-an-lvcd-board-from-a-saturn-v-rocket/A dentist x ray has been used, with some usable results.edit: Mind you, who knows the level of detail you can get and whether it's usable for you.

author: james_s
author_rank: Super Contributor
timestamp: June 11, 2017, 01:26:02 am
content: You could try a veterinary clinic, they're generally a bit less formal and uptight than human medical facilities.You could also send me the IC and I can xray it for you at my friend's business for the cost of return postage. I don't want to get flooded with stuff to xray but I don't mind doing it now and then for people.

author: rfdes
author_rank: Regular Contributor
timestamp: June 11, 2017, 12:50:05 pm
content: I appreciate the offer but I don't want to trouble you. I will try the dentist first, we seem to get along very well so I would be surprised if he told me no. We'll see how it goes.Thanks for your response.Jim

author: Twoflower
author_rank: Frequent Contributor
timestamp: June 11, 2017, 07:25:47 pm
content: Or you could go the hacking way of X-Ray your chip: Use an old TV. Not with the new rubbish flat LCDs or such. This was already used to look into some Telephone cards here in Germany about 25 Years ago (25 Jahre Chipkartenangriffe - CCC Event Blog**; Page 9). They used a Dentist Film to capture the image. They had to watch TV for some weeks(!) to get enough exposure.** German only but worth to get it translated (btw a rough simultaneous translation of the talk at the) as it contains lots of nice techniques to reverse chips. And the author has now a Electron microscope at home (last pages)

author: KE5FX
author_rank: Super Contributor
timestamp: June 11, 2017, 07:27:57 pm
content: Where in the US are you located?

author: calexanian
author_rank: Super Contributor
timestamp: June 12, 2017, 05:43:40 am
content: The dentist sounds like a good idea. A hybrid is about the same size as that little film thing they put in your mouth. Post the results!

author: rfdes
author_rank: Regular Contributor
timestamp: June 12, 2017, 11:25:14 am
content: Hi -I am actually located in the Tamp florida area.WB5KYEThanksJim

author: james_s
author_rank: Super Contributor
timestamp: June 18, 2017, 08:08:21 pm
content: Trying to use an old TV to generate useful xrays is a fool's errand when used dental xray heads can be had for well under $100. They're nice shielded assemblies with an internal HV transformer designed specifically for taking xrays.
Where to get an LQFP48 socket at a reasonible price? - Page 1
Forum section: electronics / projects

author: Fusion916
author_rank: Regular Contributor
timestamp: March 30, 2019, 10:22:49 pm
content: I'm looking for a LQFP48 socket so I can build a LQFP48 JTAG programmer where I can drop in the IC and program it without soldering.Something like this:https://www.digikey.com/product-detail/en/ftdi/VPROG-1-S-LQFP48/768-1086-ND/2441376?WT.srch=1&gclid=EAIaIQobChMIjJym-_Kq4QIVg7fACh1A3Af9EAQYASABEgLz2fD_BwEBut at a more reasonable price. Any ideas?

author: coromonadalix
author_rank: Super Contributor
timestamp: March 30, 2019, 10:59:35 pm
content: https://www.aliexpress.com/popular/lqfp48-socket.html

author: jmelson
author_rank: Super Contributor
timestamp: March 31, 2019, 12:36:24 am
content: Quote from: Fusion916 on March 30, 2019, 10:22:49 pmHey, anybody recognize that socket, and who makes it? (We are looking for a 64-pin version just like that.)It looks like it might be an Ironwood socket, that's who we are checking with right now, but haven't gotten any response from them, yet.Jon
Where to get folded bits of metal custom manufactured? - Page 1
Forum section: electronics / projects

author: robzy
author_rank: Regular Contributor
timestamp: August 24, 2023, 10:14:49 am
content: https://youtu.be/FKC6lnTKH-c?t=502In this video (8m22s) Dave shows some folded metal clips for securing banana jacks to a PCB and says you can get them custom manufactured.Any suggestions for suppliers for things like that? Anything JLCPCB-like?

author: sparkydog
author_rank: Regular Contributor
timestamp: August 24, 2023, 03:52:22 pm
content: I would also really like to know. At some point, I want to get some custom PCIe brackets made.The answermightbe "ask your local metal shop". Also look at PCBWay; they claim to do custom sheet metal stuff, though I haven't actually tried to order anything from them (yet).In any case, I'm confident those weren't made using. 🙂

author: jpanhalt
author_rank: Super Contributor
timestamp: August 24, 2023, 04:19:39 pm
content: Keystone (https://www.keyelco.com/index.cfm) has a variety of metal products. Look at terminals, male, PCB.A single bend in the one on the upper right and enlarging the hole might be close enough to what the video shows. Of course, that is only practical for relatively few. If you need thousands, Keystone can probably make them for you too.
Where to get Graphical interface for "Bus Pirate" ? - Page 1
Forum section: electronics / projects

author: Merlysys
author_rank: Regular Contributor
timestamp: January 06, 2014, 04:23:02 pm
content: There is one called Pirateship but the download link for it is dead.Are there other GUI in Windows or Linux?

author: Polossatik
author_rank: Frequent Contributor
timestamp: January 06, 2014, 04:27:27 pm
content: it's herehttp://code.google.com/p/the-bus-pirate/downloads/detail?name=BusPirateGui_win.zip&can=2&q=not sure if 's the same version herehttp://dangerousprototypes.com/2011/11/15/compiling-qt-bus-pirate-gui-under-windows/more info :https://www.google.com/search?btnG=1&pws=0&q=bus+pirate+gui+windows
Where to get LAN8720 or suitable replacement for ESP32 ethernet? - Page 1
Forum section: electronics / projects

author: nardev
author_rank: Unknown
timestamp: June 29, 2021, 12:05:24 pm
content: I have been looking everywhere for LAN8720 default version and sadly, it's out of stock everywhere. Actually at Aliexpress some sellers are claiming to sell "new" by 1-5 chips but i'm pretty sure it's just scraped, already used chips.1. Do you see it in stock anywhere? i need 100-500 od those2. Is there any other Ethernet Phy replacement chip which would not require huge changes to be used as an eth interface for ESP32?thnx

author: ajb
author_rank: Super Contributor
timestamp: June 29, 2021, 03:21:36 pm
content: I doubt you'll find a true drop-in replacement for the LAN8720, but it uses RMII, so just about any other RMII PHY should work. That's the point of having a "Medium Independent Interface" between the MAC in the ESP32 and the PHY, it should work the same no matter what PHY or what medium the PHY connects to. If the ESP32 supports MII then you have the option of using an MII PHY as well, but this will take four more pins (MII has four bit wide transmit and receive connections, RMII is only two bits in each direction but at twice the clock rate).So just look for any other PHY that has RMII and any other features you care about. All of the RMII signals (connections to the ESP32) will be the same, and all of the MDI signals (the ones that go through the magnetics to the wire) will be the same, although the way the magnetics are terminated might be different so do whatever the datasheet for the new PHY tells you to. If the ESP32 uses the management interface (SMI, using the MDC and MDIO pins) then those will be the same as well. You may need to configure the pin strapping on the new PHY to make it work the way you want, consult the datasheet and fit the appropriate pullup/pulldown resistors (and maybe leave footprints to change these in case you need to make an adjustment).

author: bson
author_rank: Unknown
timestamp: June 29, 2021, 07:39:04 pm
content: What is a "default version"? Mouser has the LAN8720A by whatever quantity you want, cut tape or reel.

author: nardev
author_rank: Unknown
timestamp: June 30, 2021, 01:44:30 am
content: Try to order it. You will get "back order" option only

author: bson
author_rank: Unknown
timestamp: June 30, 2021, 07:58:15 pm
content: Ah. I see.Are you using any of the extended registers? Most configuration is standard, and it's not that hard to switch to a different PHY; interfaces are similar, and they mainly differ in advanced features and how to set up device-specific (extended) registers. Even the extension mechanism is usually the same - one register to select an extended register, and another to access it.
Where to get long pre-crimped leads? - Page 1
Forum section: electronics / projects

author: Phoxtane
author_rank: Regular Contributor
timestamp: May 27, 2018, 01:34:30 am
content: My project is a signal board for model trains, and I've opted to use the incredibly common generic .1"-spaced right-angle pin headers as opposed to screw terminals in order to save on cost per board. However, this now means I have to equip each cable with the appropriate crimped connectors. I need two shorter cables with a length of about 6 inches, one with three wires and the other with four, and a third 24 inch cable with four wires. I've been attempting to crimp my own cables, and while I can produce a useable end product, the quality leaves something to be desired, and it's incredibly frustrating to make the crimps and insert them into the housing in the first place.I therefore started looking for pre-crimped leads, and quickly found the Pololu website, which is perfect in that I can choose from a wide range of colors (perfect for keeping the purpose of each wire clear) and comes in the lengths I'm looking for. However, I have discovered that the prices are quite high; $2.49 for a 10-pack of 6-inch cables, and $4.49 for a 5-pack of 24-inch cables!Therefore, I want to tap into other's experiences to see if there's a place to get pre-crimped wires on the cheap in a fairly large range of colors and of decent lengths.As a side note, I've noticed that many of the DCC-enabled trackside accessory boards have the ubiquitous green screw terminals instead of pin headers, even though the cost for these connectors is much higher. Is this because it allows the buyer to use whatever length of wire they want? I suppose the additional height of the board doesn't matter as much as the buyer can embed it in their foam scenery or under the bench without much trouble? In light of this, should I keep going with the pin headers or move to screw terminals?
where to get or replacement for Sanken MLE20 Mosfet - Page 1
Forum section: electronics / projects

author: MrZwing
author_rank: Regular Contributor
timestamp: January 15, 2016, 05:35:08 pm
content: I have been looking high and low and side to side to find a supplier of Sanken MLE20 mosfet and except ebay that I don't trust for authenticity.so does anyone know where to find this obscure little thing or am i just completely blind?

author: theatrus
author_rank: Frequent Contributor
timestamp: January 15, 2016, 06:39:20 pm
content: I assume this is in an audio amplifier with feedback? If so, there are alternatives out there for linear SOA FETs (random example:http://ixapps.ixys.com/DataSheet/DS100294(IXTH-TT80N20L).pdf).I wouldn't blindly swap FETs without knowing more about the amplifier of course.

author: MrZwing
author_rank: Regular Contributor
timestamp: January 16, 2016, 01:39:20 pm
content: Here is the Data sheet for the MLE 20 (though from a replica site so don't know if its the official data sheet).I also attached parts of the schematic of the amplifier, picked it as a challenge and to get some good sound in my living room.

author: Dachpappe
author_rank: Contributor
timestamp: January 16, 2016, 01:57:58 pm
content: Maybe the cross reference search on alltransistors.com can help you out! Sadly the MLE20 is so rare that the transistor is not listed there, otherwise it would be a lot easier.http://alltransistors.com/mosfet/crsearch.php?struct=MOSFET&polarity=N&pd=150&uds=150&ugs=20&id=10&tj=0&fr=0&cd=0&rds=0.2&caps=

author: wraper
author_rank: Unknown
timestamp: January 16, 2016, 03:12:58 pm
content: Yeah, MLE20 from ebay is almost guaranteed to be counterfeit.

author: wraper
author_rank: Unknown
timestamp: January 16, 2016, 03:33:51 pm
content: What is interesting about them, they have tight control of Vth, and it's rank printed on C) position (bottom of the page 2)http://www.datasheet.jp/download.php?id=928570

author: MrZwing
author_rank: Regular Contributor
timestamp: January 16, 2016, 04:11:52 pm
content: Well ofc the transistor I'm looking for is like a unicorn to find, my typical luck.thank you for the answers and ill see if I can find away around this conundrum or choose another high end amplifier with less rare components.
Where to get plastic film membrane keyboard mfr'd? - Page 1
Forum section: electronics / projects

author: rrmm
author_rank: Newbie
timestamp: March 28, 2013, 02:08:27 am
content: Hello all,I was thinking of making a pressure sensor for a project. The upshot is that I'd like to get a few of those flexible plastic membranes with conductive ink made. The sort that you would find inside computer keyboards.Anyone have experience with getting these done in prototype quantities?I'm sure they can be made by hand with conductive ink and silkscreen, but I was hoping to take the easy way out.thanks,rob
Where to get project boxes or other simple CNC work done? - Page 1
Forum section: electronics / projects

author: iceisfun
author_rank: Regular Contributor
timestamp: October 07, 2013, 11:34:50 pm
content: I need some custom flat plate parts cut out on a CNC machine, does anyone know a good place to do this in lower quantites?Also making a custom stepper motor mounting adapter in Q<10

author: nctnico
author_rank: Super Contributor
timestamp: October 08, 2013, 12:38:25 am
content: Search for 'laser cutting service'. I recently had some plastic cut. I used A9CAD (free) to produce the DXF file.

author: kalobg
author_rank: Newbie
timestamp: October 08, 2013, 05:37:10 am
content: Quote from: iceisfun on October 07, 2013, 11:34:50 pmHave you tried a local auto part fab shop?

author: Jebnor
author_rank: Regular Contributor
timestamp: October 08, 2013, 06:03:43 am
content: Mike of MikeElectricStuff suggested getting plates made up by a PCB fab. They are accustom to small quantity and odd shapes with holes.

author: KJDS
author_rank: Super Contributor
timestamp: October 08, 2013, 07:37:01 am
content: These flat plates, made from titanium, bakelite or unobtanium. 10 microns thick or 10 inches?Near Timbuktu or Toronto?

author: bhilly82
author_rank: Contributor
timestamp: October 08, 2013, 10:47:09 am
content: Local machine shops usually have a fab shop that they can make what you need if you have the planes. You will pay $40-100 usd per hour. you can also look at emachineshop.com .
Where to get small remote control? - Page 1
Forum section: electronics / projects

author: deephaven
author_rank: Frequent Contributor
timestamp: May 01, 2011, 07:51:16 pm
content: I'm looking for a small packaged remote unit with around 4 buttons on it. At this stage it could be infra red or RF and I would then build whatever is needed to receive and decode it.Any ideas?

author: DavidDLC
author_rank: Frequent Contributor
timestamp: May 01, 2011, 09:12:59 pm
content: Can you put an estimated measurement ?For example my car RC which is about 1.5 by 1 inches with 4 buttons and works with RF. Or my laptop control remote is 2.5 by 2 inches with 23 buttons and IR.

author: deephaven
author_rank: Frequent Contributor
timestamp: May 01, 2011, 09:20:17 pm
content: Quote from: DavidDLC on May 01, 2011, 09:12:59 pmThe dimensions aren't at all critical, I just want a packaged unit.

author: Chet T16
author_rank: Frequent Contributor
timestamp: May 01, 2011, 09:44:15 pm
content: http://cgi.ebay.co.uk/4-Ch-RF-Controller-Wireless-Remote-Control-Basic-Stamp-/320692317717?pt=UK_Gadgets&hash=item4aaac06e15Too tacky?

author: Chet T16
author_rank: Frequent Contributor
timestamp: May 01, 2011, 09:47:20 pm
content: http://www.sparkfun.com/products/8602AFAIK you can get the case on its own too

author: deephaven
author_rank: Frequent Contributor
timestamp: May 01, 2011, 10:06:15 pm
content: Quote from: Chet T16 on May 01, 2011, 09:47:20 pmThanks for your suggestions. The last one would be ideal but it's a bit pricey.A UK source is preferred.

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 01, 2011, 10:59:40 pm
content: wireless door bell? cheap china remote control car? RF remote control? they are alot in ebay? and cheap

author: Psi
author_rank: Super Contributor
timestamp: May 01, 2011, 11:56:41 pm
content: If you want super cheap you can always get IR remotes from deal extremeHe's one that's only US$2.21 or US$1.50 if you buy 10http://www.dealextreme.com/p/super-mini-tv-universal-remote-controller-keychain-2724They have plenty of other types tooThough, as always with deal extreme, it can take a month or 2 to arriveProbably want to get a good supply of batteries too, the cheap dx stuff can be a bit dodgy power usage wise.Oatley have a few good remotes and receiver units, but they're in Aushttp://secure.oatleyelectronics.com//index.php?cPath=47&sort=2a&page=2&osCsid=31e0b3b18df62d79a94ebdee825405c1Their TX and RX units are separate products and you have to work out which goes with which.

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: May 02, 2011, 12:05:52 am
content: Sure Electronics has a nice remote that's pretty cheap.Small 7-key User-definable Remote ControlI've been really happy with products purchased from Sure.

author: deephaven
author_rank: Frequent Contributor
timestamp: May 02, 2011, 03:29:19 pm
content: Thanks for all the great suggestions guys. I didn't find any of those when Googling, so I'm glad I asked the question. Now all I have to do is decide which one!
where to get this electrode input socket head?  - Page 1
Forum section: electronics / projects

author: loop123
author_rank: Frequent Contributor
timestamp: January 27, 2024, 01:25:45 am
content: This cable is expensive so I want to build one. I know where to get the round silver plug at right which is a 7 pin Amphenol and I know the pin designations inside.I want to know if the left white electrode input socket can be found any where or it can only be made special at factory. Have you seen anything like it being sold anywhere? It's 1.5mm Touchproof sockets.The red (+) and black (-) input is differential with a ground/reference at middle. Should I use twisted wires like used in ethernet cable as the cable? What is the size of wire I should use. How many feet before it can cause enough noises? Signal is 2kHz.

author: inse
author_rank: Super Contributor
timestamp: January 27, 2024, 07:53:30 am
content: How should anyone give advice on the cable as you are not giving any details?If it’s a medical device, special considerations should be taken into account.The plastic connector looks custom molded, could be replicated with single contacts in a (3D printed) holder and sealed in heat shrink.But I doubt you will get it as rugged and sealed as the original, but if it‘s cheap enough to replace it when it fails, go for it.For cable configuration: open the Amphenol connector and have a look.
Where to look for LCD TFT displays (Want: 480x640 portrait mode 4.7") - Page 1
Forum section: electronics / projects

author: Yansi
author_rank: Super Contributor
timestamp: November 19, 2015, 03:55:28 pm
content: Hello!Can you guys please suggest where to source LCD displays in small quantities (up to 10pcs max)? One of our current projects requires 480x640px (portrait mode, that means the shorter side is the horizontal one) color LCD display with the highest possible contrast and brightness (outdoor use) and about 4.3 to 5" diagonal. Resistive touchscreen welcome (capacitive no good for this project). Parallel RGB HS VS DE interface.Are there any suitable web pages when one can sort through LCDs easily by their parameters? Price is not so much critical in this project (enough money can be supplied), but should still be reasonable.What LCD technology would you suggest to be used for outdoor use? TFT, IPS, MVA,...? So it could be read on bright daylight.Thank you for help,Yan

author: miguelvp
author_rank: Super Contributor
timestamp: November 20, 2015, 01:50:03 am
content: you can go to town here:http://www.beyondinfinite.com/lcd-panel.phpbased on your parameters 4.3 to 5 inches and 480x640 I could only find three (all of them 5 inches) and they are all parallel RGB. If you can live with 480x800 there are more choices it seems.Edit: BTW the last two have datasheets included.http://www.beyondinfinite.com/pvi/pd050vx5/(discontinued)http://www.beyondinfinite.com/samsung/ltp500gv-f01/(discontinued)http://www.beyondinfinite.com/pvi/pd050vxb/(in production)As for the touchscreen not idea but I bet you can source that separate.The smallest they offer in there is 6.4" diagonal but you don't need to use the full screen I guess.http://www.beyondinfinite.com/touch-screen/4Wire-resistive-datasheet.htmlEdit2: I'll be, it seems the 2nd one (samsung ltp500gv-f01) has the touchscreen already built in (seems it's 4 wire resistive but didn't look in detail), if you can't source it from them there are plenty by doing a google search (average price seems to be about $50 per unit)Edit3: if sourcing from alibaba or ebay keep in mind they might sell you the display used on a phone (HTC 7500 U1000) but it seems to have access to the actual pins (10 seconds into this video)
Where to obtain NTC temp sensor? - Page 1
Forum section: electronics / projects

author: MattSR
author_rank: Regular Contributor
timestamp: June 08, 2015, 10:16:21 am
content: Hi All,I am adding a digital temperature controller to an electric urn that I use for homebrewing purposes. The controller is what's known in brewing circles as an STC-1000 type controller, and I am looking for a NTC temp sensor that I can mount in the bottom of the urn to measure the water temp inside. I have seem similar sensors before, and they just bolt through the base of the vessel and is secured with a nut.The controllers documentation says the required sensor type is an NTC, 25 degrees C = 10K and B=3435. I understand the first two parts, but the "B=3435" kind of escapes me. Can someone point me to a supplier of these sensors?CheersMatt

author: LukeW
author_rank: Frequent Contributor
timestamp: June 08, 2015, 10:33:52 am
content: This is what B means:http://en.wikipedia.org/wiki/Thermistor#B_or_.CE.B2_parameter_equationDigikey will let you search thermistors by their B-parameter, presumably other big distributors will too.http://www.digikey.com/product-detail/en/NTCLE101E3C90173/BC2907-ND/4896944This one has a B25/85 value of 3435K.B25/85 refers to the two temperature points where the resistance has been measured to calculate the B-parameter. Ideally I suppose you want this to align with the temperature range you're using the thermistor in, for optimal accuracy.As for picking a particular thermistor, it will depend a lot on what your operating temperature is, and what kind of package you want.

author: Ian.M
author_rank: Super Contributor
timestamp: June 08, 2015, 10:34:44 am
content: GIYF:http://www.google.com/search?q=stainless+NTC+25%C2%B0C%3D10K++B%3D3435
Where to put a power-on LED - Page 1
Forum section: electronics / projects

author: Hextejas
author_rank: Frequent Contributor
timestamp: December 05, 2018, 01:41:03 pm
content: In this schematic.I want to have some indication that the beast is on.Thanks

author: hayatepilot
author_rank: Frequent Contributor
timestamp: December 05, 2018, 03:10:28 pm
content: Will the two rails be connected in series to have a symmetric voltages for a power amplifier? i.e. V+, GND, V-?Then I would put the LED across V+ and V- so each rail is equally loaded. And in this case you could also save one Bridge rectifier.Otherwise just put it across one of the rails. Judging from the grunty components you will probably not notice the tiny additional load on one rail.Greetings

author: ArthurDent
author_rank: Super Contributor
timestamp: December 05, 2018, 06:02:35 pm
content: Because you have two separate identical power supplies that can output several amps of current, I would put a resistor/LED across each output. Where the two outputs are separate you will need two indicators to show that each of the two supplies is working.

author: t1d
author_rank: Super Contributor
timestamp: December 06, 2018, 12:19:02 am
content: Quote from: ArthurDent on December 05, 2018, 06:02:35 pmIf panel space is tight, maybe you could use a two-color LED? That would show 4 states...- Off/Both Failed- Only one color, one side operational- Only the other color, the other side operational- The two colors making an averaged color, both sides operational.

author: ArthurDent
author_rank: Super Contributor
timestamp: December 06, 2018, 04:45:37 am
content: The problem with using one LED for 4 states is it's easy to forget which color means what. LEDs are small and cheap, use 2.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: December 07, 2018, 03:07:41 am
content: Quote from: ArthurDent on December 06, 2018, 04:45:37 amOr use one if he just wants to know if it's plugged in.

author: cdev
author_rank: Super Contributor
timestamp: December 07, 2018, 03:48:49 am
content: Make it bright and red. For two supplies use two switches and LEDs in two places and I would even draw some boxes or put a line across the thing dividing its panel and clustering each supply's controls so you can clearly see which switch and which LED refers to which supply and that one or both are on. Thats it. Everybody does that for a reason. Don't confuse people.Quote from: Hextejas on December 05, 2018, 01:41:03 pmBeasts.

author: james_s
author_rank: Super Contributor
timestamp: December 07, 2018, 05:39:53 am
content: Put it on either output, if one is on the other will be on too.Or my own preference, put a neon indicator lamp across the primary.

author: Hextejas
author_rank: Frequent Contributor
timestamp: December 07, 2018, 11:02:57 am
content: Quote from: james_s on December 07, 2018, 05:39:53 amThank you all for the excellent comments. I was not clear in what i wanted. I just wanted it to indicate that it was turned on.Whereas I had not considered showing that either/both rails was working.
Where to put support hole for M.2 3042? - Page 1
Forum section: electronics / projects

author: LM21
author_rank: Regular Contributor
timestamp: July 06, 2022, 01:50:13 pm
content: Does anyone have exact location of support hole of M.2 3022 modem? It is of course near 30mm from the connector, but what exactly. A mechanical drawing perhaps?I did search, but net is so full of SSD sellers, that I couldn't find anything useful.

author: Haenk
author_rank: Super Contributor
timestamp: July 06, 2022, 03:06:26 pm
content: Quote from: LM21 on July 06, 2022, 01:50:13 pmMaybe this helpshttps://www.delock.de/infothek/M.2/M.2.htmlSo that seems to be 42mm from connector edge to middle of hole and 15mm for side edge to middle of the hole (for 3042).

author: Hydron
author_rank: Super Contributor
timestamp: July 06, 2022, 05:06:15 pm
content: What CAD package are you using? If it's altium I could give you my (tested) footprints for M-key 2280, E-key 2230 and B-key 3042 (this last one is what you need now)Failing that, you can probably find them online too, especially if it's for something popular like Kicad or Eagle.

author: LM21
author_rank: Regular Contributor
timestamp: July 06, 2022, 08:10:58 pm
content: I use KiCad for this project. Edit: I have to see what Kicad has already done.
Where to source 120VAC xformer for a 5VDC PS? - Page 1
Forum section: electronics / projects

author: Holes Flow
author_rank: Contributor
timestamp: May 21, 2021, 10:44:06 pm
content: Experts,Just can't find dirt cheap xformers to take 120VAC down to where I can rectify it to 5VDC... Thinking in the neighborhood of 7 or so VAC secondary... With wall warts so cheap, I figured the xformers in them should be a few bucks... But I can't find them cheap!I don't need massive QTY, like maybe 10 if sub-$4...Any ideas appreciated!Thanks!

author: james_s
author_rank: Super Contributor
timestamp: May 21, 2021, 10:51:49 pm
content: I don't think you'll find them for the price range you're looking for, not much uses transformers like that anymore since they have been effectively banned in most cases by energy efficiency regulations. Modern wall warts are all switchmode power supplies and the transformers in those are custom parts. The transformers you want are still readily available but I'd expect them to cost $10-$15 each in small quantities.

author: bdunham7
author_rank: Super Contributor
timestamp: May 21, 2021, 11:33:11 pm
content: How much current do you need?https://www.allelectronics.com/item/pctx-612/6v/1a-or-12vct/.5a-pc.mt.transformer/1.htmlhttps://www.mouser.com/ProductDetail/Triad-Magnetics/FS12-200-C2?qs=b1anAsPanWzy5NMZ5F%252Brrg%3D%3D

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 22, 2021, 12:14:40 am
content: Have you seen the price of copper? Those wall warts are all switching power supplies, some even switching in the MHz, no one uses 60Hz step-down transformers any more.Perhaps a new approach is needed?

author: langwadt
author_rank: Super Contributor
timestamp: May 22, 2021, 01:01:03 am
content: Quote from: Holes Flow on May 21, 2021, 10:44:06 pmbuy random usb charger

author: BrokenYugo
author_rank: Super Contributor
timestamp: May 22, 2021, 01:09:42 am
content: 6.3 V filament transformer?

author: rdl
author_rank: Super Contributor
timestamp: May 22, 2021, 11:44:34 am
content: Power required?If only a few watts, look at Tamura 3FS series (3FS-xxx). PC mount, small, up to 12 VA. Price range is around $5-$15 depending.
where to source compact loop current sensors  - Page 1
Forum section: electronics / projects

author: qwaarjet
author_rank: Regular Contributor
timestamp: July 20, 2017, 09:28:48 pm
content: I can find a number of people selling sensor like this.they are compact hall sensors in the 30-200 Amp DC range.1. is there some common name for this configuration2. is there reputable source to get them. Ie is there premium version that has proper documentation and come from reputable company or supplier.I'm interesting these because of the compact and sealed nature. I don't want to use a PCB based model since they often involve soldering and lack conformal coatings. tractionals industrial DIN sensors are too bulky

author: duak
author_rank: Super Contributor
timestamp: July 21, 2017, 03:05:59 am
content: G'day,I suppose they're called magnetic current sensors or transducers. LEM and Honeywell both make them with various characteristics.Cheers,Duane

author: ganzuul
author_rank: Contributor
timestamp: July 21, 2017, 09:40:03 am
content: Something like this?https://www.aliexpress.com/item/A34-AC-current-sensor-module-short-detection-50A-output-wholesale-and-retail/32610162796.htmlIf its made in China, might as well order as directly as you can. Alibaba can give you quotes for bigger batches.

author: DBecker
author_rank: Frequent Contributor
timestamp: July 21, 2017, 03:48:15 pm
content: Quote from: ganzuul on July 21, 2017, 09:40:03 amThat is an AC current sensor -- a current transformer. The last batch I bought for experimentation cost $1 for five. Unless they are "revenue grade" ($$) expect quite a bit of sample variation and temperature/frequency/moonphase quirks.You want a DC current sensor. LEM is the traditional brand when you don't want to mess around, but there are other quality brands. And plenty of less expensive ones. Most old-school LEM models require +-12V, but modern ones work on +5V and even 3.3V. There are both pass-through (e.g. solid ring) and clamp-around types, in round and rectangular apertures.I've also made my own by cutting open a toroid and epoxying an A1301/A1302 linear hall sensor in the gap. They had quite satisfactory performance at a few hundred amps (given the noise environment of switching tens of kilowatts at 15KHz). A design hint: I ran them at 5V, using a 3.3V ADC. Zero amps is at the midpoint, 2.5V. I used a pull-down resistor and ran them so that the primary current direction resulted in lower output e.g. 100A is 2.0V, 200A is 1.5V. That gave me expanded range and a measure of fail-safe operation.
Where to source optics components, lenses, mirrors, prisms etc? - Page 1
Forum section: electronics / projects

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: May 22, 2015, 11:29:17 pm
content: As many people here I often use suppliers like DigiKey, Mouser, TestEquity to source my electronic components but I am trying to find similar kind of supplier for optics, lenses, mirrors, prisms and other stuff like that.Can anyone suggest good supplier for optics from personal experience?

author: rx8pilot
author_rank: Super Contributor
timestamp: May 22, 2015, 11:39:41 pm
content: http://www.edmundoptics.com/http://www.thorlabs.us/index.cfmWhat are you looking to do?

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: May 23, 2015, 12:08:37 am
content: I am trying to finish TOF laser range meter project that I started some time ago. I want to try something different and for that I need semi-transparent mirror/beam splitter.Also I want to build ring laser gyroscope on solid state laser. Not sure it is really feasible as semi-hobby project but from what I gathered it is not very hard if I can find right components.( Kind of like this but not with HENe laser:http://www.photonics.ld-didactic.com/Educational%20Kits/P5885.html)

author: Wim_L
author_rank: Regular Contributor
timestamp: May 23, 2015, 02:09:53 am
content: Thorlabs or Edmund will certainly have the kinds of beam splitter and any other optics you need.The solid state ring laser will be more challenging. You can't just dump any kind of solid state laser into those. The usual assembled solid state laser modules will certainly not work (though they could be used as a pump source) because they are only open from one side. You need an active lasing element that can be integrated into the ring. For example, see the diagram in this paper:http://www.congrexprojects.com/custom/icso/2012/papers/FP_ICSO-119.pdf

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: May 23, 2015, 04:03:15 am
content: Quote from: Wim_L on May 23, 2015, 02:09:53 amI have looked at this document actually, but red it thoroughly only now.I started thinking maybe HeNe tube really better, verified solution especially since I have very limited experience. I found something that may work - it looks like this is the right kind with two ends.(http://www.aliexpress.com/item/HeNe-laser-tube-power-0-8mW-150mmx26mm-length-x-diameter/630588961.html)
Where's diracdelta.co.uk? - Page 1
Forum section: electronics / projects

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: June 19, 2017, 05:51:54 pm
content: I've always relied on that great site for formulas and all manner of engineering information. It seems to be gone, though you can still see some/most of it using the Wayback Machine. Anybody know if it's temporary or permanent?

author: mikerj
author_rank: Super Contributor
timestamp: June 19, 2017, 10:51:34 pm
content: The domain expired on June 15th. Looks like the owners company is about to be struck off as well

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: June 20, 2017, 02:09:56 am
content: Well, that's disappointing. Hopefully the owner will find a new home for it. Thank goodness for the Wayback Machine.
Where's Waldo - Page 1
Forum section: electronics / projects

author: Ferroto
author_rank: Frequent Contributor
timestamp: March 06, 2010, 06:30:26 pm
content: So anyone here ever produce there own Silicon art work?http://news.cnet.com/What-art-is-hiding-on-your-microchip/2100-1006_3-5893374.html?tag=mncolAlso here's a whole gallery full of this stuffhttp://microscopy.fsu.edu/creatures/index.html
Where/how to find flexible wires? - Page 1
Forum section: electronics / projects

author: zapta
author_rank: Super Contributor
timestamp: January 03, 2014, 01:43:42 am
content: I want to build a few low voltage test pod leads like this one and would like to have though really flexible wires, preferably color coded (e.g. using resistor colors).http://www.svteq.com/servlet/the-41/HP-POD2-LOGIC-ANALYZER/DetailI can tell if a wire is flexible when I touch it but am not sure how to specify it when ordering online. For example, Digikey has this parametric searchhttp://www.digikey.com/product-search/en/cables-wires/single-conductor-cables/1638740?k=wireAny idea where and how to find such wires?

author: Unknown
author_rank: Unknown
timestamp: January 03, 2014, 01:47:23 am
content: Describe 'flexible'.Something with lots of fine strands is flexible, how many depends on what you want it to do and how flexible you want it. PVC quality and thickness is another factor.Not sure I fully understand the question though tbh.

author: robrenz
author_rank: Super Contributor
timestamp: January 03, 2014, 01:53:28 am
content: Very fine stranded wire withSilicone insulation= flexible

author: liquibyte
author_rank: Frequent Contributor
timestamp: January 03, 2014, 02:02:57 am
content: Quote from: robrenz on January 03, 2014, 01:53:28 amLike the wire they use inside flat screens from the caps to the screen itself. That stuff is really flexible. I have a bit of it that's marked "E204798 AWM 1A 3239 20KV-DC 22AWG 150C FENG TAI ELECTRONIC". It's silicone insulated and the insulation is fairly thick and it behaves like a piece of silicone tubing.http://www.digikey.com/product-detail/en/3132-22-1-0500-002-1-TS/CN100W-25-ND/3766877

author: Frost
author_rank: Regular Contributor
timestamp: January 03, 2014, 02:14:54 am
content: Quote from: zapta on January 03, 2014, 01:43:42 amThe Flexi/Silivolt-1V and 2V Line from Multi-Contact are very flexible.PDF Dropdown -> de-enhttp://www.multi-contact.com/products/cableline/1

author: cellularmitosis
author_rank: Unknown
timestamp: January 03, 2014, 09:25:47 am
content: +1 on the silicone fine strand recommendation. I searched eBay a few months back and ordered 50 ft of Pomona 18AWG in red and black, $20 per 50 ft, and have been very happy with it. It's part 6733-0 (black) and 6733-2 (red).http://www.pomonaelectronics.com/?i=nr_doityourself_cat3_testleads

author: robrenz
author_rank: Super Contributor
timestamp: January 03, 2014, 01:12:03 pm
content: I use the exact same Pomona stuff for test leads, excellent quality and price

author: SArepairman
author_rank: Frequent Contributor
timestamp: January 04, 2014, 12:50:18 am
content: how about wire that is designed to survive many flexes (like a telephone cable?)is silicone the best? what criteria should you look for?

author: WarSim
author_rank: Frequent Contributor
timestamp: January 04, 2014, 12:58:33 am
content: Core markers are another option, to reduce the restriction concernes.Sent from my iPad usingTapatalk
which 3D compass + 3D inclinometer IC? - Page 1
Forum section: electronics / projects

author: webgiorgio
author_rank: Regular Contributor
timestamp: September 09, 2018, 11:42:15 am
content: Hi,which part number would you use for a 3 axis accelerometer + 3 axis magnetometer with i2c interface?The module GY-511 is using a LSM303DLHC from ST, but on farnell/mouser it says that LSM303DLHC is out of production. (I can't use a module, I need to use the IC directly on my boards)https://www.ebay.it/itm/GY-511-LSM303DLHC-3-Axis-e-compass-acceleration-sensor-modulo-w-Pin-Header/112577024152?hash=item1a361d1098:g:qmQAAOSwqDha~-UzI found a new part, LSM303AGRTR from ST, but the package LGA-12 is too small, 2x2x1 mm, Pin pitch is 0.5 mm. I am afraid of problems in the manufacturing. What do you think?https://www.mouser.dk/ProductDetail/STMicroelectronics/LSM303AGRTR?qs=sGAEpiMZZMvzNxwKcL67%252blZFq4J3uRh8bxIk42XdBnY%3dhttps://www.mouser.dk/datasheet/2/389/lsm303agr-954987.pdfhttps://www.st.com/en/mems-and-sensors/e-compasses.html?querycriteria=productId=SC1449
Which BPW34?? radiation sensor is better - Page 1
Forum section: electronics / projects

author: KedasProbe
author_rank: Frequent Contributor
timestamp: October 03, 2012, 11:49:48 am
content: Hi,Does anyone know which version if this BPW34 would be best for this nuclear radiation sensor circuit.Anyone tried this design (diode + amplifier)?http://www.docstoc.com/docs/114281564/Elektor-Radiation-MeterFarnell does seem to have many variants like (VBPW34FAS), which one would be better for this design, blocking light filter seems good assuming it doesn't block radiation, any nuclear radiation experts here?

author: SeanB
author_rank: Super Contributor
timestamp: October 03, 2012, 03:32:52 pm
content: Any of them, as you are going to keep it in the dark. Best is to select the low dark current units though, less noise.
Which cheap UV cure torch on eBay (Australian stock)? - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: July 22, 2020, 04:59:05 am
content: I'm hoping some one can point me at a UV torch for glue curing on eBay with Aussie stock. Resin ended up getting cured all over the lens on my little Bondic UV torch fob thing and it now takes ages to cure.It seems the torches need to be 395nm or thereabouts.There's a pile of cheap ( sub $10) 9 LED torches on eBay but I don't know if they'll cure the resin. Maybe the beam is too diffuse.BCF and Annaconda both sell $15 UV torches for use in fishing but they don't indicate the wavelength.Any Aussies bought one that worked well?

author: DTJ
author_rank: Super Contributor
timestamp: July 22, 2020, 07:17:07 am
content: Sheesh Blueskull $100, I'm not that keen!Maybe I'll try and clean up my keychain LED and transplant the LED into a torch body.

author: DaJMasta
author_rank: Super Contributor
timestamp: July 22, 2020, 05:03:09 pm
content: Worth mentioning, if you're going for a cheapy, don't expect for it to live up to its specs.I got one of those ~$10 USD 365nm "5W" flashlights, this onehttps://www.ebay.com/itm/NEW-1-2PCS-High-Powered-UV-Lamp-Black-Light-Ultra-Violet-Flashlight-365nm-5W-LED/303349748350, that lived up to none of its claims. Even on the brighter setting it's a pretty dim illumination, and not because my eyes can't see it... it measures like 394nm on the spectrometer so it's clearly not the LED binning they're claiming either. It's also clear from the kinds of things that fluoresce that it's not a short wavelength of UV.Haven't actually used it for curing, but I got it with the intent to use it on some of the curable solder mask you can get, it will probably do the job, just with longer cure times than you'd hope for.

author: RenThraysk
author_rank: Regular Contributor
timestamp: July 22, 2020, 09:45:20 pm
content: Convoy S2+ UV 365nm not available?https://convoy.aliexpress.com/store/330416/search?SearchText=uv+flashlightPSA: If ordering from the US, either of the two with LG leds with ZWB2 filters are subject to custom seizure. Some American has a patent on using a ZWB2 filters with UV lights.
Which chinese manufacturer prints this diamond-like logo on SMD LEDs? - Page 1
Forum section: electronics / projects

author: hanakp
author_rank: Regular Contributor
timestamp: September 12, 2025, 09:45:24 am
content: This is related tomy other thread, but I'm seeking a different thing here. I have unknown purple LEDs in 0603 package that have diamond-like symbol printed on the underside. It seems to be quite unusual, or at least I couldn't find any SMD LED photos with the same symbol online. Could you tell me which chinese manufacturer uses it? I tried to make a photo under a microscope; the colors are all wrong, but only the shape is important here. Thanks.