hybridfree/eevblog-posts huggingface dataset:
Device equivalent software or site - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: September 21, 2018, 08:54:58 am
content: HelloI want to find a pin compatible alternative for this device.K9F5608U0D-PCBhttps://www.datasheets360.com/search/results?query=K9F5608U0D-PCBDatasheet360 do give you alternative parts for some components. See an example for IS61WV5128EDBLLhttps://www.datasheets360.com/search/results?query=IS61WV5128EDBLLSearch for the link "Cross Reference Search" on the page above.I know these are references to obsolete parts but I have seen some usable results from Datasheet360 in the past.Now my problem is that Datasheet360 do not provide alternatives for the K9F5608U0D-PCB.Are any of you aware of some website or piece of software that can suggest an alternative.Thanks

author: DimitriP
author_rank: Super Contributor
timestamp: September 22, 2018, 12:42:17 am
content: Ebayhttps://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=K9F5608U0D-PCB&_sacat=0you are welcome
device recommendation needed for wifi - RS485 Modbus RTU bridge - Page 1
Forum section: electronics / projects

author: vinistois
author_rank: Newbie
timestamp: January 12, 2016, 10:17:33 pm
content: Hi! My first post here, going to try to keep it brief!I have a modbus RTU slave device which I want to talk to with an embedded micro. The end goal is to use an app like Blynk (what a great app!!) to communicate with the modbus device. The Blynk app is setup to talk to any arduino, Rpi, Intel board, Photon, Ti launchpad, etc etc, or even just an ESP8266. I am having a hard time choosing, and hoping to tap into some opinions here!Here is what I'm looking for:- ease of implementing Modbus RTU (485) communication with a slave device- flexible power input - the Modbus product uses RJ45s for power and comms, ideally I'd like to plug in a single RJ45 to a board and it will get power and rx/tx from the device.- easy wifi and/or BTLE, ideally on the board- Just a few digital i/o's and analog inputs would be a bonus- Web server functionality would be great, so that I can replicate the functionality of the blynk app from any remote device (with security!)- MicroSD slot for datalogging- battery backup and charging circuit also helpfulWith all options (I think) I will need differential RS485 transceiver(s). I am looking at the SparkFun SP3485 RS485 breakout. It seems like I will need 2 of these to go full duplex... So does that mean I need a board with 2 UARTS?I hope to implement the SimpleModbus libraries, as they are shown to work for most people in the research that I have done.So far I am looking at the particle photon as it appears to have most of what I need. I could make great use of the relay shield. No SD card, however... Or the Photon Redboard. Or the ESP8266, (as in the Adafruit Feather HUZZAH or Sparkfun Thing), also seems to be capable of what I need. Or even something like theKTA-223 USB/RS485 Relay IO BoardBasically there seems to be many good choices here. How does one pick??Thanks!

author: ajb
author_rank: Super Contributor
timestamp: January 12, 2016, 10:41:33 pm
content: As far as I know, none of the development options for the ESP8266 permit low-level access to the UART(s), so I'd be a bit leery of trying to achieve a robust binary serial protocol implementation on it. A basic MODBUS implementation that only needs to deal with one device might not be too bad, though. An ESP8266 would certainly be the cheapest/simplest hardware option.For full duplex RS485 you only need one UART, but one RS485 receiver (rx) and one RS485 driver (tx). You could use a pair of MAX485-equivalent transceivers and have one configured as driver and one as a receiver, or you could use a device that has a dedicated driver and a dedicated receiver. Note that the master device's TX pair must connect to the slaves RX pair and vice versa.
Device-side Qualcomm Quick Charge 2 "trigger" circuit? - Page 1
Forum section: electronics / projects

author: eas
author_rank: Frequent Contributor
timestamp: August 15, 2016, 07:27:38 am
content: I am hoping to use use a USB power bank that supports Qualcomm Quick Charge 2 as a 12V power supply for an otherwise "dumb" device.Can anyone point me to a simple implementation of the circuitry needed to negotiate the 12v output?I think I have enough information to figure out a solution myself, but I'd rather start with a known-good design.If I understand things correctly, the QC2 charger (ie my the USB power bank) starts by signaling support for USB Charging-1.2. The device is then supposed to drive the USB D+ and D- lines high ( >0.325v, <2v) for at least 1.25s. This should put the charger in QC2 mode. The charger will then connect a pull-down to D-, and once D- goes low for more than 1ms, it will look for the device to signal the requested output voltage. For 12v, it is supposed to hold D+ and D- at 0.6v.So, if I've got that right, I think I could manage it with a small MCU, a voltage regulator, a few passives and some simple code, but, again, I'd rather start with something that is know to work.Thanks for any suggestions on where I can find something to get me started!

author: crazyguy
author_rank: Regular Contributor
timestamp: August 15, 2016, 08:40:22 am
content: take a look of the NCP4371 State Diagram on page 10NCP4371 - Qualcomm Quick Charge 3.0 HVDCP Controllerhttp://www.onsemi.com/pub_link/Collateral/NCP4371-D.PDF

author: eas
author_rank: Frequent Contributor
timestamp: August 15, 2016, 05:49:49 pm
content: Thanks! I actually found that diagram shortly after I made my post, which helped clarify the handshaking.I'm still hoping to find an existing device-side implementation of QC2/HVDCP handshaking I can leverage. There are some ICs, but they including a 1S charger, which I really don't need.
Device testing setup - Page 1
Forum section: electronics / projects

author: Remark
author_rank: Contributor
timestamp: February 05, 2023, 09:29:55 pm
content: Hello everyone!I'm currently writing technical documentation for one of the designing devices. I faced a question, how should the mechanical reliability of the device be defined? I'm talking about mechanical strength and stability during device transportation from one place to another.Perhaps there are some methodologies or widely used and repeatable tests to describe the mechanical reliability of a device? I would like to know more about it.Thank you very much for the answers.Remark.

author: jpyeron
author_rank: Regular Contributor
timestamp: May 06, 2023, 02:31:57 pm
content: I would start by looking at MIL-STD-810 - focusing on the test methods for vibration, shock, acceleration, etc...You can use their terminologies and methodologies adjusted to your desires / budget constraints.
device to filter incoming Ac for testing gear. conditioner? link to buy them? - Page 1
Forum section: electronics / projects

author: mookie1590
author_rank: Contributor
timestamp: March 12, 2023, 09:32:15 pm
content: I'm looking for a device to filter incoming mains voltage to run my testing gear. I think a conditioner matches this description. but there is so many, at many diferent prices. Idk what one to purchase, if that is even what I need.What started it was that I have a cheaper 5v usb powered scope. It came with a wall wart. I didn't use it and plugged it into my power strip that had usb slots in it. But it was giving my false measurements. So I had to use the included wall wart.But its weird, they both provided 5 volts, both supplied 2 amps. but seemed to work fine underload. but using the one in the power strip gave fasle measurements. Gonna buy a scope that isnt a 5v unit. looking into getting a Rigol MSO5074https://www.amazon.com/dp/B08MB13G1L/?coliid=I26IWLEIA4QKTG&colid=D42NGZYY5BRK&psc=1&ref_=lv_ov_lig_dp_itthink went up a couple hundred thats lovely.But I digress. I want clean conditioned power coming in for my measuring equipment. What should I buy? Everyone just link what I should buy for clean power for my gear. I have other things on this circuit and cant really install more mains circuits sadly or I would make a dedicated like.thanks
Device to have one audio channel take precedence over another? - Page 1
Forum section: electronics / projects

author: ledtester
author_rank: Super Contributor
timestamp: June 03, 2025, 03:26:17 am
content: I have two audio channels coming into a mixer and I'd like to have one "take precedence" over the other in this sense: if audio is detected on channel A then channel B will be muted or attenuated.Are there devices which do this? Is there a term for this kind of device or capability?Thanks!

author: Analog Kid
author_rank: Super Contributor
timestamp: June 03, 2025, 04:12:44 am
content: Lessee: two comparators cross-coupled to two analog switches?Just my first guess.

author: Someone
author_rank: Super Contributor
timestamp: June 03, 2025, 04:24:43 am
content: Its called a ducker

author: Terry Bites
author_rank: Super Contributor
timestamp: June 03, 2025, 06:27:41 pm
content: thatcorp.commake an ideal ic with a fw evelope detector and a quality VCA, job done!See THAT4315 about 20NZDs

author: themadhippy
author_rank: Super Contributor
timestamp: June 03, 2025, 06:49:33 pm
content: quack quackhttps://sound-au.com/project183.htmor if moneys no problemhttps://www.canford.co.uk/Products/58-409_RDL-ST-VP2-PAGING-MODULE-Automatic-ducking-adjustable-depth
Devices that support the Sony SLVS-EC sensor interface - Page 1
Forum section: electronics / projects

author: Spirit532
author_rank: Frequent Contributor
timestamp: May 22, 2023, 11:24:56 pm
content: I'm looking for an SoC or something similar that has 8x SLVS-EC input lanes, to talk to a Sony IMX426 sensor.So far I've been able to find the following:Socionext - Milbeaut SC2000 - No replyAmbarella - CV5, CV52, etc - No replyHiSilicon - Hi3519AV100 and a couple others - No reply, but also told by a Chinese distributor that the entire series is discontinued due to TSMC embargoDoes anyone know of another secret chip that can talk this stupid high speed Sony-gatekept interface, or have contacts at one of the above three who could get me a few samples and documentation(under NDA is fine)?I want to build a tiny, cheap high speed camera using the IMX426 - it outputs a respectable 800Mpix/s through 8x 2.4Gb/s SLVS-EC lanes, 800x600@1600fps and up to 7-8kfps at lower res(though I believe it's possible to go a LOT faster with "unsupported" ROI configs and a slightly faster clock), but most importantly it's very cheap(<$70 @ qty1, <$50 @ 1k), and comes in a much more sane, solderable LGA package, rather than PGA like most high speed sensors.I would also very much prefer to avoid using an FPGA, mostly because I am too dumb to use them, and because SLVS-EC IP is high 4, low 5 figures. FPGAs with 8+ 2.5Gbit/s transceivers are also quite expensive.

author: Andlier
author_rank: Contributor
timestamp: August 23, 2024, 02:51:23 pm
content: Sorry for jumping in a year+ later... did you find anything that fit the bill? I'm also interested in SLVS-EC capable SoC's or similar. I believe the nvidia jetson had hardware support early on, but difficult/non-supported in software.

author: Spirit532
author_rank: Frequent Contributor
timestamp: August 23, 2024, 02:52:36 pm
content: Quote from: Andlier on August 23, 2024, 02:51:23 pmNo, it's just FPGAs, unfortunately. Very little off the shelf stuff.
DeWalt 18V battery connector - Page 1
Forum section: electronics / projects

author: leonerd
author_rank: Regular Contributor
timestamp: November 30, 2017, 11:19:31 pm
content: Does anyone have a good idea for how to connector to a DeWalt 18V battery, to use it as a power source?Context: I have a number of DeWalt power tools, which all use their new 18V battery with the slide connector, and therefore quite a good supply of batteries and chargers for them.I occasionally find myself in remote situations where getting a power socket is non-ideal, but where I'd like to be able to power some bits of test equipment or maybe a soldering iron. Most of my equipment would either be happy at 18V, or draws sufficiently low current that a switching converter should be fine for it. I'm therefore thinking, if I just had a way to tap that 18V out of a DeWalt battery, this would be very convenient as I can reuse my existing batteries and chargers.My only real thought currently is to keep an eye on eBay for DeWalt drills or other power tools sold off as "for spares" or otherwise not working, in the hope that I can salvage the battery connector part from them. Such tend to be few and far between however
DFN with ground pad underneath without plated vias - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: March 27, 2017, 06:01:48 am
content: Hi guys,Working on a 2.4GHz LNA board, and found an interesting amplifier IC. It comes in a 8 pin DFN with ground pad underneath, as most of these parts have. The problem is that the PCB technology I have to manufacture this on does not have plated-through vias. Usually, the way we do them is by running a thing wire through the hole and soldering it on both sides, but that's not really possible in this case. Can I get away by running traces to the on the same layer and use a lot of flux and hot air to get it soldered? Any other tricks I can use for this?(part in question is a MGA 637P8 from Avago (now broadcomm)

author: MagicSmoker
author_rank: Super Contributor
timestamp: March 27, 2017, 10:12:47 am
content: 2.4GHz, you say? You're definitely going to need several plated through stitching vias between the IC's ground pad and a lower ground plane layer. I suspect you are also going to need to use a more exotic board material than FR4 (ie - Rogers).I do not think that trying to use any sort of escape routing from the ground pad will give satisfactory results due to excessive inductance. That sort of stunt tends to stop working around a few 10's of MHz (or when transition times drop below, say, 10ns).

author: jpanhalt
author_rank: Super Contributor
timestamp: March 27, 2017, 10:37:55 am
content: A picture can be worth a lot of words...Check out Schmart boards for how to deal withthat pad on QFN's:http://schmartboard.com/schmartboard-ez-qfn-12-pins-to-24-pins-5mm-pitch-65mm-pitch-2-x-2-grid-202-0016-01/John
DFPlayer mini tutoria with "error" but works - Page 1
Forum section: electronics / projects

author: Youkai
author_rank: Regular Contributor
timestamp: May 16, 2020, 06:41:47 am
content: I can't figure out why this tutorial for the DFPlayer mini works. It seems to me that there is a clear error in the programming code. The tutorial:https://circuitjournal.com/how-to-use-the-dfplayer-mini-mp3-module-with-an-arduinoIf you look at the code there is this section:Code:static const uint8_t PIN_MP3_TX = 2; // Connects to module's RXstatic const uint8_t PIN_MP3_RX = 3; // Connects to module's TXSoftwareSerial softwareSerial(PIN_MP3_RX, PIN_MP3_TX);You can clearly see that the item he has commented as "RX" is the "TX" variable. But the TX variable is using the pin that is going to RX in the diagrams.The RX and TX are swapped in the code but it actually works that way. I tried "fixing" the code and you get no audio. As far as I can tell from the wiring diagram and the documentation on "SoftwareSerial" this code should be incorrect. What am I missing?

author: OwO
author_rank: Super Contributor
timestamp: May 16, 2020, 02:36:34 pm
content: Maybe think about it a bit more

author: coromonadalix
author_rank: Super Contributor
timestamp: May 16, 2020, 04:05:12 pm
content: They are not swaped in the code, you define the tx and rx pins of the arduino board going to the moduleyou use pin 2 as the tx of the arduino boardyou use pin 3 as the rx of the arduino boardThe wire connections "are" crossed going to the mp3 moduleanother pagehttps://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299#target_7

author: Youkai
author_rank: Regular Contributor
timestamp: May 17, 2020, 04:15:30 am
content: Thanks. I looked at the comments from the source code a little more carefully and figured it out. Good to see confirmation thoughI didn't get that at first which is probably why my original sketch with a different library didn't work lol.
DG419 switching issues - Page 1
Forum section: electronics / projects

author: Merlyn
author_rank: Contributor
timestamp: September 18, 2018, 04:03:38 pm
content: Hi,I decided recently to use 2pcs of DG419 to make a DPDT switch and I got some weird things going on.https://www.vishay.com/docs/70051/dg417.pdfThe DG419s are powered from a single rail supply (9V). As per datasheet V- (pin7) is connected to GND (pin3) and VL (pin5) to V+(pin4).First weird thing is at around 400mV RMS (1kHz) the DPDT switch would start passing signal even when not powered.Second when powered at around the same level it would start clipping while according to datasheet it should pass levels up to the rail.I haven't used these before and I guess I'm missing something.

author: Benta
author_rank: Super Contributor
timestamp: September 18, 2018, 04:37:54 pm
content: If your signal is ground referenced, you're outside the operating range of the switches. If you can, DC bias your signal to 1/2 VDD. If this is not possible, you need a bipolar power supply for the DG419s.I've used the DG419 in a lot of projects, even real-time switching of analog video. They're great little devices.

author: Merlyn
author_rank: Contributor
timestamp: September 18, 2018, 06:46:54 pm
content: Thanks for your input. I'll try that.

author: Zero999
author_rank: Super Contributor
timestamp: September 18, 2018, 08:37:12 pm
content: There are analogue switch ICs which will work with negative signals, but they're typically only rated for 5V operation or less.https://www.intersil.com/content/dam/intersil/documents/isl5/isl54059.pdfhttps://www.st.com/resource/en/datasheet/stg5682.pdfhttp://www.onsemi.com/pub/Collateral/NLAS2750-D.PDFMore information about analogue switches.http://www.analog.com/media/en/training-seminars/tutorials/MT-088.pdf

author: Merlyn
author_rank: Contributor
timestamp: September 26, 2018, 04:47:19 pm
content: I rewired the circuit and added a negative rail (via charge pump) and the headroom problem is now solved.Not that it matters but the strange issue of the switch passing signal when not powered is still there.

author: Zero999
author_rank: Super Contributor
timestamp: September 27, 2018, 08:37:01 am
content: Quote from: Merlyn on September 26, 2018, 04:47:19 pmIf the analogue switch is unpowered, then it's not surprising it's passing some of the signal, which will leak through the ESD protection diodes.When the analogue switch it unpowered it should be disconnected from all signal sources. It is not the same thing as a relay.
DI 469 Transistor - Page 1
Forum section: electronics / projects

author: eddy66t6
author_rank: Contributor
timestamp: April 15, 2016, 05:33:49 pm
content: So I'm modding some music gear, and looking for anyone who has ever seen this transistor? It's a drum machine that I'm working on, the audio appears to enter the transistor and a trigger signal triggers the audio and transistor at the same time which goes off to a mixing section then on the P.C.B. I'm just looking for data to confirm my thoughts and suspicions; footprint or package type and possible replacement if needs be...The writing says DI 469 R M on each of them (there's 8...). (I've already done the google on it...no joy)Thanks

author: 4cx10000
author_rank: Regular Contributor
timestamp: April 15, 2016, 05:41:35 pm
content: Hi!How about 2SD1469R

author: eddy66t6
author_rank: Contributor
timestamp: April 15, 2016, 07:34:20 pm
content: Hi thanks! That looks exactly right thanks! Of course what I thought was an I was a 1I'd never seen the type of package before...

author: Seekonk
author_rank: Super Contributor
timestamp: April 15, 2016, 08:48:49 pm
content: Looks like an opamp.

author: eddy66t6
author_rank: Contributor
timestamp: April 15, 2016, 09:16:14 pm
content: That's pretty much what it appears to be....there's 8 channels of audio, each coming into it's own transistor here, with three resistors and a filter cap...each each channel has a different 'level' resistor... I've traced this section out this section and it appears to be a fixed mix for the Left and Right outputs of audio. There's some individual channel panning going on somewhere too...
Dick Smith 3 digit counter k-3451 - Page 1
Forum section: electronics / projects

author: pcolombo
author_rank: Newbie
timestamp: May 09, 2018, 11:39:49 am
content: Hi, Does anyone have a schematic of the D.S 3 digit counter K-3451?. I need to know what the connections are at the end of the pcb. I turned the counter into a timer using thumb wheel switches to operate a solid state relay that powered the primary of a high voltage transformer. Switching times are in milliseconds to 5 seconds. I made one of these years ago, but some wires have broken off and I am trying to resuscitate it.Thanks,Paul

author: Circlotron
author_rank: Super Contributor
timestamp: May 09, 2018, 01:00:25 pm
content: https://www.vkham.com/resources/kits-manuals/dse-kit-information
did I get faulty amplifier question - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: May 09, 2025, 05:38:19 pm
content: Hello, I have bought an amplifier shown below.However when I am trying to test if my VDD is shorted to GND my measuring i get the DMM beeping as if the VDD is shorted to GND. ash shown in the layout belowAlso when I measied the resistance across C2 capacitor I see only 1.6ohm.DId I get a faulty component?Thanks.A video of me doing the test is attached in the link.Thanks.https://www.minicircuits.com/pcb/98-pl771.pdfhttps://www.minicircuits.com/WebSto...o0IgWenwgd_y056U_ftvRuC5rgiL5QeNqO8nX58qABDuFhttps://technionmail-my.sharepoint....YiIsInJlZmVycmFsTW9kZSI6InZpZXcifX0=&e=mXZlhF

author: eutectique
author_rank: Frequent Contributor
timestamp: May 09, 2025, 09:03:21 pm
content: Quote from: john23 on May 09, 2025, 05:38:19 pmDid you click the links you posted? Do it.

author: Someone
author_rank: Super Contributor
timestamp: May 10, 2025, 01:04:42 am
content: Quote from: john23 on May 09, 2025, 05:38:19 pmUnlikely. You're still trying to work with devices and technology way outside your skills or experience, instead expecting the forum to do your work for you.
Did I make this right? - Page 1
Forum section: electronics / projects

author: thinkpad4by3
author_rank: Newbie
timestamp: July 11, 2019, 04:28:30 pm
content: Hi guys,I made my first schematic and board in Eagle over the last few weeks. I was going to send it off for fab but I figured it would be a good idea to get a second eye on the project to see if I messed anything up the DRC/ERC won't catch or if there is something very wrong with my routing or what not.And the project is a new mainboard for an Atari 2600 using original chips, but added composite and eventually s-video.Link for it here:https://github.com/Thinkpad4by3/AtariPortable

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: July 12, 2019, 07:44:33 am
content: Would you mind posting pictures or a PDF of the project? I highly dislike github and also don't have eagle to open any of your files.

author: thinkpad4by3
author_rank: Newbie
timestamp: July 12, 2019, 10:44:22 pm
content: Quote from: Ysjoelfir on July 12, 2019, 07:44:33 amSure, I attached the board layout for the top and bottom, along with a full view and schematic.
Did OPA687 ever come in a dip package? - Page 1
Forum section: electronics / projects

author: lincoln
author_rank: Regular Contributor
timestamp: September 07, 2015, 03:59:28 am
content: Hello,I'm modifying an Extron ADA 4 300MX distribution amp to buffer 10MHz to various test equipment in the lab, basically tying the three RGB channels together, and populating the empty BNCs.I'm trying to figure out what op amp they used.There is no maker's mark, just the number 687JLooking around the web, the closes that I could find was an OPA 687. Only thing is it seams that they wern't offered in a dip package. Other than that the circuit and specs all match.What do you think?link

author: DimitriP
author_rank: Super Contributor
timestamp: September 07, 2015, 04:29:42 am
content: My ADA 3 180 and gerry's ADA 6 300MX HV use the CLC409http://gerrysweeney.com/tag/ada-6-300mx-hv/

author: lincoln
author_rank: Regular Contributor
timestamp: September 07, 2015, 05:35:46 am
content: interesting, mine was mad in '95 and is all through hole.
Did the CAN bus standard evolve from something else? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: September 29, 2021, 05:13:52 am
content: Whilst pondering the timing and cable length limitations associated with the in-frame ACK system I tried searching for the history of the CAN bus standard and the web just kind of says it was invented as a brand new thing in 1986.Is that the whole story or did it evolve from something else, and was the use of an in-frame ACK system a completely novel idea at the time?
Die photo: rough idea? - Page 1
Forum section: electronics / projects

author: Manul
author_rank: Super Contributor
timestamp: January 03, 2022, 12:44:32 am
content: Hello guys,sorry for image quality. This is an unknow die. Could be asic. Do any of you have a rough idea based on structure? Originally I was thinking that this IC could be MCU, but after revealing the die it looks to me just some collection of logic gates. Is it safe to assume that it is just hardwired logic IC, no programmable fuses or something of that sort? Middle/late 80's.Does it look like masked gate array maybe?

author: jbeng
author_rank: Regular Contributor
timestamp: January 03, 2022, 11:44:29 pm
content: Noopyis the resident IC die expert here, perhaps he'd like to weigh in on this.If there is any member who might have an idea, my money would be on him.No offense intended toward anyone else, of course.

author: strawberry
author_rank: Super Contributor
timestamp: January 04, 2022, 12:19:08 am
content: programmed when applying metal layer..

author: Manul
author_rank: Super Contributor
timestamp: January 04, 2022, 12:34:47 am
content: Quote from: strawberry on January 04, 2022, 12:19:08 amSo you think it is MPGA? I was wondering myself while looking through microscope, because it has a very regular pattern of identical/similar structures and lots of horizontal/vertical interconnections (reminds that classic PCB routing scheme).

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 04, 2022, 12:47:20 am
content: I also think it's some kind of gate array.And this is what a classic gate array usually is: a bunch of base cells, sometimes down to the transistor, configurable with one or more metal layers for the interconnections.Also sometimes called ULAs.Sinclair was notorious for using ULAs in their products. The ZX81, ZX Spectrum and QL all used an ULA, customized for their particular applications.And as far as I can see, there seems to be 44 pads, so this could well be one of those ULAs that were available in DIP-40 packages.

author: Manul
author_rank: Super Contributor
timestamp: January 04, 2022, 01:09:23 am
content: Thanks for confirmation, that helps me a lot with circuit analysis.
Die Photographs - Page 1
Forum section: electronics / projects

author: Hayabusa02
author_rank: Newbie
timestamp: April 09, 2024, 04:34:10 pm
content: I work for an AI Accelerator startup and we just built our second ASIC device and I am looking to get die photographs taken...where they remove the package, remove the substrate and bumps, and strip off a few layers before photographing. I'm hoping that someone can direct me to a company that does this work so I can use those images in marketing material. Any help would be very much appreciated.

author: tautech
author_rank: Super Contributor
timestamp: April 10, 2024, 11:33:51 pm
content: Welcome to the forum.Member Noopy is our expert in these matters and in his profile page you can find his several threads where you might jump into one for assistance.
Dielectric constant for trace parasitic calculations? - Page 1
Forum section: electronics / projects

author: Shocker
author_rank: Contributor
timestamp: September 04, 2015, 07:06:08 pm
content: Hi,I'm designing a high-frequency circuit - 0.5-1GHz and i want to calculate the parasitics that the PCB traces will have.In calculations, the dielectric constant, Er, is included. Eg.This online calculatorThis is the stackup of the PCB that i'm using from the manufacturer i'm using.The Er forFR4is 4.2-4.8 and the Er for2116 HR Prepregis 3.6-3.8.Signal traces are on layer 1 and and ground layer is on layer 2.If i'm calculating trace parasitics for the outer layer, layer 1, should i use 3.6-3.8 for the Er or 4.2-4.8?It seems intuitive to use 3.6-3.8 since it's for the medium between the signal trace and ground layer. If it's not 3.6-3.8, why is the core FR4 of the PCB used?Thanks

author: tree
author_rank: Regular Contributor
timestamp: September 04, 2015, 07:21:11 pm
content: If you need accurate results I'd strongly advise you try using a field solver. If not, then using the dielectric in between the two copper layers is what you ought to do (e.g. the prepreg in your case), but it will not capture higher order parasitics.I'll leave this here and you may find it useful for reference.http://www.edn.com/collections/4435129/1/Bogatin-s-Rules-of-ThumbEDIT: Use this calculator (http://www.eeweb.com/toolbox/edge-coupled-microstrip-impedance/) to double check your results. This is the most accurate one I've found to date which uses correct formulas.

author: John_ITIC
author_rank: Frequent Contributor
timestamp: September 04, 2015, 10:07:30 pm
content: The dielectric contact is 1 for air, 3.6 for pure resin and 6 6 for pure fiber glass. It is the fiber weave in the pre-preg that determines the ratio resin/fiber glass and the resulting dielectric constant. For 2116, the resulting Er is about 4.http://www.freelists.org/post/si-list/Dielectric-constant-for-FR4-at-above-1Ghz-frequency,13Having said the above, 1 GHz is not really that high a frequency so you can easily just say that the Er is 4.5 and use that value regardless if pre-preg/fiber weave used. If you have really long (tens of inches) runs of 5-10 GHz transmission lines in FR4 then you may have to start worrying about the trace and fiber weave directions. A more narrow fiber weave gives a more even impedance. Things like via stubs have a bigger effect on the resulting impedance. Er would not come into the picture until 5-10 GHz.I think you would need to have advanced software to analyze such a design properly. Or lots and lots of time and patience...

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 04, 2015, 10:15:56 pm
content: If you ever have holes in the ground plane, through which an overlying trace can "see" the core beneath, then it will matter, somewhat.Otherwise, if you definitely have all the signal traces routed over the nearest ground plane, only the prepreg constant matters, that is correct.1GHz isn't too bad, and if you aren't making any resonant structures or long traces, you might not even notice the difference -- as far as losses go.Tim
Dielectric strength of PCB perpendicular vs parallel - Page 1
Forum section: electronics / projects

author: Poe
author_rank: Frequent Contributor
timestamp: March 05, 2020, 05:33:02 pm
content: Laminate suppliers only list one "Dielectric Strength" so I assumed that orientation didn't matter.Then I discovered that there are two voltage breakdown tests. Test method IPC TM-650 2.5.6.2 is used for testing perpendicular to the plane and 2.5.6 parallel to the plane.The 2.5.6 test appears to have a much lower passing threshold. So much so that IPC2221B guidelines for internal clearances come into question.Does the claimed "Dielectric Strength" value of a PCB laminate really only apply to voltages perpendicular to the plane (2.5.6.2)?Is there another name for the test results of 2.5.6?Thank you.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 05, 2020, 06:31:37 pm
content: The difference between the two is related to a phenomenon usually called "surface flashover". You can look that up - not an extremely simple thing - but basically, voltage breakdown between conductors on the surface of an insulator occurs at much lower voltages/lower distances than through the material (perpendicular).

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 05, 2020, 09:01:26 pm
content: Related to that, if there is delamination, then the same can happen inside the board. Especially between inner conductors (since, thru holes have outer layer annular rings closer together than the holes).Even without delamination, I would also be curious what the lateral breakdown is.There's no particular reason to expect it to be isotropic -- the fiberglass weave is not evenly distributed, and is oriented in plane. There may also be gaps, voids, defects in the layup at edges of inner layer copper -- the edges are mechanical displacement, stress raisers and concentrate the electric field.Tim

author: TimFox
author_rank: Super Contributor
timestamp: March 05, 2020, 09:28:04 pm
content: In general, the breakdown voltage gradient (V/mm) along a discontinuity in materials (such as the boundary surface between a solid insulation and air) will be substantially less than through a homogeneous material.

author: Poe
author_rank: Frequent Contributor
timestamp: March 09, 2020, 05:59:22 pm
content: Thank you for the replies, but I'm still struggling with this.The 2.5.6 test doesn't appear to be testing surface flashover. Rather breakdown through the laminate itself.https://www.ipc.org/TM/2.5.6b.pdfThe test sample is immersed in an oil bath to avoid flashover and the instructions say to retest if the breakdown didn't happen though the material.TimFox - I guess that would explain why the voltage parallel to the plane has a much lower passing value than parallel. There are numerous continuous barriers along the glass weave from end to end.What I find surprising is that the IPC2221B generic standard clearances for internal layers (Table 6-1) are insufficient for the IPC TM-650 - 2.5.6 passing voltage. They appear more appropriate for the perpendicular test (aka "Dielectric Breakdown" in the laminate datasheet).
Diference between TOP245F and TOP245FN - compability issue - Page 1
Forum section: electronics / projects

author: hobo2566
author_rank: Contributor
timestamp: July 30, 2014, 03:59:24 pm
content: I am not expert on things like this, i can determine when something is broke and not functioning, but these tinny things are out of my league.So i have this TOP245F that is shorted and not working. So i ordered replacement by same marking but instead i got TOP245FN, that N on ed is troubling me. I went thru datasheet and with my knowledge no help or clarification.If any one had same issue or just knows if there is difference, are they compatible? I doubt that extra N is there for nothing. It is for one LG 17" LCD power supply board repair so I am not eager to put it there without be sure they are compatible.Thank you upfront!

author: dannyf
author_rank: Super Contributor
timestamp: July 30, 2014, 04:04:41 pm
content: You probably want to read that little datasheet a little bit harder.Trust me, it is there.

author: mariush
author_rank: Super Contributor
timestamp: July 30, 2014, 04:15:04 pm
content: Page 46 :http://www.mouser.com/ds/2/328/top242-250-9213.pdfN just means the leads are tinned with plain tin (no lead). No letter after F means the leads/contacts/pins were tinned with leaded solder.

author: hobo2566
author_rank: Contributor
timestamp: July 30, 2014, 04:31:35 pm
content: Quote from: mariush on July 30, 2014, 04:15:04 pmThank you both, last pages are always my nemesis
Diff probe inaccuracy - Page 1
Forum section: electronics / projects

author: Faringdon
author_rank: Super Contributor
timestamp: January 26, 2024, 09:23:29 pm
content: Hi,Does anyone have info on the situation with diff probes causing ghost pulsing every other 10ms (when connected to mains circuits) due to their 4MEG connection to earth?eg, the TL041 and MX9003This is along the lines but does not illucidatehttps://www.eevblog.com/forum/testgear/better-diff-probe-to-avoid-inaccurate-scopes/TA041 diff probehttps://uk.farnell.com/pico-technology/ta041/probe-active-differential-powered/dp/1667343
Difference active & passive strain gauge - Page 1
Forum section: electronics / projects

author: A2
author_rank: Contributor
timestamp: March 25, 2014, 08:27:40 am
content: I was reading:http://www.ni.com/white-paper/4172/en/#toc51. What is difference between active & passive strain gauge.2. What is difference between Quarter-Bridge Type II & Half-Bridge I.http://www.ni.com/white-paper/4172/en/#toc5http://www.ni.com/white-paper/4172/en/#toc6I think what I understand is in quarter bridge , dummy gauge is not bounded to specimen.But how it can done When we place two gauges on close proximity to each other.

author: mjkuwp
author_rank: Unknown
timestamp: March 25, 2014, 11:09:01 am
content: "with the difference being that in the half-bridge type I configuration the R3 element is active and bonded to the strain specimen to measure the effect of Poisson’s ratio." from one of the references.The difference between the two configurations is mechanical in nature, not different in the circuit although you would interpret the results differently, I suppose.An active strain gauge is glued to something that will move to create strain. A passive strain gauge is just resistors. It is mounted on the material in such a way that strain is not induced in it. I think the purpose is to keep it at the same temperature as the active strain gauge in the circuit. This helps to reduce offsets that would be produced by temperature swings.I'm no expert- just in the middle of learning as you are. hopefully someone will swiftly correct me if I have any of this wrong.

author: A2
author_rank: Contributor
timestamp: March 28, 2014, 12:50:58 pm
content: In half bridge type 1 what is Poisson gauge.what's its advantage.What does following mean in this contet:half bridge type 1 Compensates for the aggregate effect on the principle strain measurement due to the Poisson’s ratio of the specimen material.

author: mjkuwp
author_rank: Unknown
timestamp: March 28, 2014, 06:10:25 pm
content: http://en.wikipedia.org/wiki/Poisson's_ratiobit of a guess here. When metal (or practially anything) bends it does so in two directions. Stretch a rubber band it will not only get longer, it will get more skinny. The ratio of the two is defined by Poisson's ratio.Depending on what you are interested in, with regards to the strain you may have an interest in this or you may not.
Difference amplifier for off-line current shunt - Page 1
Forum section: electronics / projects

author: LukeW
author_rank: Frequent Contributor
timestamp: March 06, 2014, 05:32:23 pm
content: - Off-line 240VAC- Current sensing at up to 15-20A max with a shunt resistor of say 5-10 milliohms.- No Hall effect sensors or current transformers - too bulky, too expensive. Best if the solution is compact and cheap. Galvanic isolation from the mains line is not needed.- At the moment, the current shunt is in series with the neutral line to the load, and the 5V SMPS output is relative to the mains neutral - that is, the ground from the SMPS is connected to the neutral on the SMPS input side, connected to the neutral of the mains supply. But keep in mind that the local DC ground is a self-contained thing - it's a floating, isolated system.So, effectively, one side of the current shunt is ground and the other side of the current shunt is very close to ground - say 100mV RMS, if it is 10A RMS across 10 milliohms.Anyway, any recommendations for a differential amplifier that might work well in this application, with a single-ended supply?Is the AD8210 likely to be a reasonable choice, or are there any cheaper candidates?

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 06, 2014, 06:23:47 pm
content: Just use any plain opamp with AC coupling. Offset voltage would then be irrelevant.

author: LukeW
author_rank: Frequent Contributor
timestamp: June 27, 2014, 07:51:55 am
content: As a bit of a follow-up here, I have sketched up a couple of candidate circuits.I'm not sure which is best, in terms of low cost, small size and component count, and a reasonable degree of precision.I'm measuring current in a 240VAC 50Hz 10A system, with the grid neutral referenced to the local ground in the analog side of the system (before ADC and optical isolation), with the shunt resistors in the neutral line.The LMP8601 has the smallest component count, but the 8-SOIC package is relatively large. The single-opamp approach is probably the cheapest, especially if a cheap opamp, eg. MCP6001 or something cheap and slow like that is used. But it adds a few extra cheap jellybeans such as resistors.The ADC is referenced to 1024mV, and the signals are offset up by 512mV allowing the whole bidirectional sine wave to be captured. The gain figures are set up to clip hard to the 0/1024mV limits at about 16A of current, so there's a reasonable bit of headroom.Any thoughts or comments? Which option do you think is best?

author: LukeW
author_rank: Frequent Contributor
timestamp: June 29, 2014, 05:47:06 am
content: Any takers?

author: mij59
author_rank: Frequent Contributor
timestamp: June 29, 2014, 06:23:22 am
content: Hi,The INA170 is a high side current monitor, minimum common mode voltage is 2.7 V , so it will not function in your circuit.
Difference between 74hc688 and M74HC688M ? - Page 1
Forum section: electronics / projects

author: diracshore
author_rank: Regular Contributor
timestamp: August 11, 2012, 05:29:34 pm
content: Hi all,Is there a difference between 74HC688 and M74HC688M ?Also between 4514 and NTE4514B.And..... 74HC32 and 74HC32N, 74HC32D, MC74HC32N, MM74HC32M, NTE74HC32Clearly there is a difference, but is it relevant to me ? Are these parts interchangeable ?The schematic is on page 66 herehttp://www.informatics.sussex.ac.uk/users/adrianth/lazwebpag/web/Publications/THESIS/ssxdphil.pdf

author: Unknown
author_rank: Unknown
timestamp: August 11, 2012, 08:24:54 pm
content: The prefix may indicate manufacturer (NTE4514B is most likely an overpriced NTE part, MC will be an ON Semi part). The suffix will usually indicate package type or temperature range. I believe N and D stand for DIP and SOIC for NXP parts. Other vendors may assign different meanings. Electrically they should all be compatible, unless you rely on some unspecified behavior.

author: diracshore
author_rank: Regular Contributor
timestamp: August 11, 2012, 11:37:06 pm
content: Ok,Disregarding the prefix then, I have two dilemmas.For 74HC688 I can choose 74HC688D or M74HC688M. So assuming D means DIP I will choose the former. But I would like to know what M is, the datasheet does not specify.Then for 4514,I can chooseMA4514R @ $63CD4514DB-3 @ $25CD4514BEX @ 2CD4514BE @ 1, package PDIPhttp://pdf1.alldatasheet.com/datasheet-pdf/view/26909/TI/CD4514BE.htmlNTE4514B @ 2, package DIPhttp://www.datasheetarchive.com/dataframe.php?file=DSAP001428.pdf&dir=Datasheets-115&part=NTE4514B#The 4514 in the schematic has pins Y0-Y15 however Y12,Y13,Y14,Y15 seem to go nowhere. I suppose that means unused ?NTE4514B has pins labeled S0-S13.Unsure...

author: diracshore
author_rank: Regular Contributor
timestamp: August 11, 2012, 11:50:36 pm
content: Appears 74HC688D is SOIC. 74HC688N is DIP. Where can I find the key to the suffix for a manufacturer ?

author: David_AVD
author_rank: Super Contributor
timestamp: August 12, 2012, 12:17:04 am
content: The manufacturer's data sheet will usually list all the package variations and their suffixes.

author: SeanB
author_rank: Super Contributor
timestamp: August 12, 2012, 05:48:38 am
content: There is no real commonality for suffixes, most manufacturers will use a common scheme across the range they supply, but some have differences. Only way to be sure is to look at the manufacturers data sheet for the part. Some suffixes also indicate a different pinout in the same package.

author: diracshore
author_rank: Regular Contributor
timestamp: August 17, 2012, 11:06:35 pm
content: Thanks guys,You were right it was all in the datasheets. I was looking at the short / incomplete versions.
Difference between BDT and BDV transistors - Page 1
Forum section: electronics / projects

author: dejv
author_rank: Newbie
timestamp: July 29, 2018, 01:08:58 pm
content: Hi you all,I've been lurking around this forum for a while now, and now It's finally time to make my first post.I'm in the process of recreating an older power amp design, and the output stage is built around a couple of complementary darlington's. These are named with the prefix BDT##, and are now discountinued. Luckily I was able to find the same type in the BDV-series. I've looked through the datasheets, and aren't able to find any notable differences in the characteristics. Do anyone know for sure what the "V" instead of "T" means? Transistor naming schemes are a jungle!

author: Kleinstein
author_rank: Super Contributor
timestamp: July 29, 2018, 03:24:54 pm
content: The naming is sometimes odd. Quite often die series like BDT, BDV do have a meaning - this could be a preferred case, age, process or original manufacturer. However there are so many systems with so many exceptions that it is not really worth finding patterns. Usually BD... where supposed to be some kind of power transistors for linear operation.So compare the data-sheets and the requirements of the circuit to see if they fit.

author: wraper
author_rank: Unknown
timestamp: July 29, 2018, 03:37:00 pm
content: You did not name particular components. Why do you expect an answer? I could be just a different package.

author: dejv
author_rank: Newbie
timestamp: July 29, 2018, 03:59:14 pm
content: Kleinstein: Thank you for clarifying this. It's what I was afraid of, since there are no decent information about this, at least not that I'm able to find.wraper: My bad! The transistors are BDT65B and BDT64B, and I'm searching for if there is a difference in the BDV-version, except from a new package. I know the electrical specs are equivalent, I'm just trying to understand why they have a new name.

author: wraper
author_rank: Unknown
timestamp: July 29, 2018, 04:12:00 pm
content: Quote from: dejv on July 29, 2018, 03:59:14 pmBDT comes in TO-220, BDV in TO−218 and TO−247. Also apparently BDT and BDV come from different manufacturers.QuoteWhy different package is not enough to have different prefix. it's quiet common.

author: wraper
author_rank: Unknown
timestamp: July 29, 2018, 04:18:37 pm
content: Look onto this datasheet.https://eu.mouser.com/datasheet/2/205/99383-1109920.pdf

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: July 30, 2018, 12:28:44 am
content: Quote from: wraper on July 29, 2018, 04:18:37 pmFactually you are right here, but as the BD?-designations originated under the ProElectron scheme, it was not altogether unreasonable to assume that there should be some order to suffix letter allocation.
Difference between GAL 16V8B and 16V8D - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 11, 2020, 03:05:01 pm
content: I'm thinking of buying some 16V8 for the parts box... needed for future bodging of 5V projectsI see lots of 16V8D? Are these the same as 16V8B?Thanks in advance

author: oPossum
author_rank: Super Contributor
timestamp: February 11, 2020, 03:40:14 pm
content: They are functionally the same and use the same bitstream (JEDEC file). Programming is a bit different so make sure your programmer supports the exact part.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 11, 2020, 04:19:32 pm
content: Thanks for the info. Seems to be on the TL866A TL866CS list athttp://www.autoelectric.cn/MiniPro/MiniProSupportList.txtFingers crossed.
Difference between LPDDR2 S2 and S4? - Page 1
Forum section: electronics / projects

author: jacksexton
author_rank: Newbie
timestamp: June 22, 2016, 01:12:55 am
content: Looking at page 18 of the JEDEC spec on LPDDR2http://www.jedec.org/sites/default/files/docs/JESD209-2B.pdfI am trying to figure out the difference between S2 and S4. Does this mean with a 266MHz clock, S2 is only capable of transferring 533Mbps while S4 can transfer 1066Mbps at that same frequency?