hybridfree/eevblog-posts huggingface dataset:
An amateur tries DDR4 layout with KiCad and has some concerns ... - Page 1
Forum section: electronics / projects

author: homebrew
author_rank: Frequent Contributor
timestamp: March 18, 2021, 08:40:05 am
content: Hi everyoneI couldn't resist the challenge to do my first true high speed design. Beforehand, I read a lot, watched probably every Rick Hartley and Robert Feranec video I could find on YouTube. So I though I did my homework but now I don't feel that I get along particularly well...The board I intend to design is around one of NXPs communication processors (LS10XX) with 8GB of DDR4 RAM. As the DDR4 part seems to be the biggest challenge for me I startet with that part of the design to see if I'm capable of doing this at all.So here are some considerations and restrictions:* As I cannot shell out k$ on professional software, I'm practically bound to KiCad.* The same goes for the the pcb manufacturing. It must be manufacturable in a pooled service. I found the Eurocircuits does 8-layer impedance controlled boards with a 4/4 spacing and 0.125mm anular rings in a reasonable price range. Burried vias, via in pad etc. is out of question for me.The stackup I use (One of Rick Hartleys suggested stackups58:04):1. Signal/Pwr2. GND3. Signal/Pwr4. PWR5. GND6. Signal/Pwr7. GND8. Signa/PwrUsing Eurocircuits impedance calculators, it turned out that given their "asymmetric" use of prepreg and core material gives roughly the same impedances for mictrostrips and striplines with this particular stackup - a coincidence?. This was a pivotal moment to me realising this property, because otherwise I would have stoped right there.NXP has some good design guidelines on the web for DDR4:https://www.nxp.com/files-static/32bit/doc/app_note/AN5097.pdfMost of their guidelines I think I can match but for some (e.g. suggested trace distances) I can't even imagine anybody matching it. My biggest concern is crosstalk in the Address/Command lines due to a lack of distance between individual signals. Given my impedance calculations I need 0.166mm thick traces. In combination with 0.8mm BGA pitch, it was a challenge to me to get the fly-by-topology routed at all.So here is the VEREY unfinished/current "piece of art".What do you think?Is it even worth continuing?Any suggestions?
An Amiga 1200 clone PCB I found online - Page 1
Forum section: electronics / projects

author: chronic8000
author_rank: Newbie
timestamp: August 18, 2019, 02:02:31 pm
content: Hi everyone,I found a PCB for an Amiga 1200 someone has reverse engineered and I thought to ask people on here if anyone would be kind enough to take a quick look at it and see if there is anything I should change before sending off to get a couple made as it's cheap enough to do now and could work out alot cheaper than a real A1200.The project is here:http://wordpress.hertell.nu/?p=587The Gerber files I will send off are here:http://www.hertell.nu/webfiles/ReAmiga1200Rev14.zipBe interested to hear peoples thoughts but could be a fun project.

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 18, 2019, 03:43:38 pm
content: Nice project. Those Amigas were something!Just a thought though. Apparently, this is just a complete cloned PCB and not just a re-designed Amiga 1200 clone. Apart from the fact that a re-design with a proper schematic (that people could further tweak) would probably have been more interesting to many, the difference may be important. How legit is it? Someone may still hold the rights to this. I know Commodore was revived as a new company "Commodore USA" in 2010 (stopped in 2013) which seemingly bought the rights and IP. So I don't know who owns them now, but that could still be a problem. They are probably not in the public domain? If anyone knows more about this, do not hesitate to give more info!

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 18, 2019, 04:38:59 pm
content: Instead of using what are more or less unobtanium old chips, what about emulate them using FPGAs?

author: chronic8000
author_rank: Newbie
timestamp: August 18, 2019, 05:02:38 pm
content: Quote from: NiHaoMike on August 18, 2019, 04:38:59 pmIf I had the skills to design a FPGA board I would for sure. Have you seen the price secondhand A1200's are?

author: Kleinstein
author_rank: Super Contributor
timestamp: August 18, 2019, 07:19:19 pm
content: The PCB alone does not really help. The magic of the Amiga is in the special chips and the software. AFAIK in most counties the circuit diagram as a list of connections is not protected as such, only the concrete PCB layout is. A recreation with different trace width is already a different thing.The problem is getting the software (ROM part) legally, different from original ROMs. Getting the special custom chips is similar difficult. For the audio chip, a FPGA alone may not do the magic, AFAIK it contains an DAC.So maybe if one has a rotten board due to a leaking battery, there is limited use for such a board. Even than I don't expect a used A1200 to be very expensive. I don't even think a used A4000 is so valuable - I still have one collecting dust.
An Arduino hardware watchdog, the picky way. - Page 1
Forum section: electronics / projects

author: centinex
author_rank: Newbie
timestamp: July 08, 2020, 04:29:54 pm
content: Hello folks.Just a quick hack. It may give the idea to others.I've replaced the defective and old management system of the 36kW home boiler (natural gas powered) with a thing built from scrap and stuff and a bunch of relays and an arduino. I needed the thing to be highly reliable nevertheless to prevent any HHCF event ("Halt and Home Catch Fire"...). So there is lot of redundant safety interlocks in the way its wired, and the software incorporate multiple points of fail-safe. But Arduinos are cool toys easy to use, but there are no serious watchdog readily available in them (well there is, in the Atmega but, it is needed to hack the stock bootloader and things to get it work, anyway a processor watching himself is a conceptual point of failure), and it could freeze in a state that leaves critical output enabled (ie the things keeps burning), tripping some last resort thermal switch, which would need manual intervention in the end.So i've added a max6370 watchdog chip to tickle the reset pin in case of freezing. With its 15s-ish selectable timeout, it's perfect for the job (the arduino bootloader takes 2s to boot up, so a standard fixed 1.6s watchdog like the wd100 from ST is a tiny bit too fast, the board get stuck in a bootloop. Don't ask me how I know that). All this kind of chips are on tiny SOT23 package... Tiny enough to fit inside a dip socket.... So I thought, what about taking on the challenge to solder the tiniest piggyback board possible ever? =)The SOT package is epoxy-glued upside down, before wiring with enamel-coated wire. It's small but nothing in the realm of the impossible, it probably took me less time to handwire this thing than to find a scrap board with an SOT23 pattern etched on, to cut and repurpose it, tied to a prototyping board with the socket and pins soldered separately, to bodge in the end a larger piggyback board. Random generic decoupling cap added for good measure. Also before plugging on the board, the thing has been completely potted in epoxy glue.

author: MarkMLl
author_rank: Frequent Contributor
timestamp: July 09, 2020, 10:53:57 am
content: Quote from: centinex on July 08, 2020, 04:29:54 pmNo you don't. The only issues are (a) whether the bootloader puts all registers in the right state when the watchdog triggers (and fairly recent bootloaders do) and (b) whether it zeroes the MCUSR register thus hiding the cause of the last reset (which fairly recent bootloaders do). So provided that you don't want to log why the Arduino restarted you don't need to fiddle with the bootloader, I've got a 90-min watchdog working fine here using a mix of a counter in the ISR and a nested watchdog event (forcing a reset) when it zeros.MarkMLl
An audio mixer kit with no schematic - Page 1
Forum section: electronics / projects

author: K-Experiment
author_rank: Contributor
timestamp: May 24, 2019, 03:59:40 pm
content: I got an Audio mixer kit but there is no available schematic diagram so I need help in making my own audio mixer with the following parts:2, 100 ohm resistor 1/4w10, 1k ohm resistor 1/4w2, 10K ohm resistor 1/4w1, 1M ohm resistor 1/4w4, IN4001 Diodes1, Red 5mm LED4, 0.1 uf (104) ceramic capacitors2, 0.0002 uf (22) ceramic capacitors2, 1000 uf 16v electrolytic capacitors2, 100K ohm Potentiometer6, 10K ohm Potentiometer1, 250v 0.2a fuse1, 250v spst switch1, 220v to 9v 200a transformer (secondary is center tapped)2, UA741cp op-Amp(Mains Voltage is 220v 60Hz)(ps: there was no circuit board)

author: Zero999
author_rank: Super Contributor
timestamp: May 24, 2019, 04:19:02 pm
content: I can guess, but the old 741 isn't a very good op-amp for audio. It will work, but isn't ideal.

author: soldar
author_rank: Super Contributor
timestamp: May 25, 2019, 01:36:52 pm
content: Quote from: K-Experiment on May 24, 2019, 03:59:40 pmNo PCB? No schematic? You bought this as an "audio mixer"? Because what you got is not an audio mixer at all. You just got a bunch of parts.If you want an audio mixer you might as well start all over again. It will save you time and trouble.

author: magic
author_rank: Super Contributor
timestamp: May 25, 2019, 03:04:27 pm
content: Something like figure 4heremust have been intended.I'm only puzzled by the choice of resistors, 1k seems low for the inputs and no other value is available in enough quantity.

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 25, 2019, 03:16:32 pm
content: Quote from: Zero999 on May 24, 2019, 04:19:02 pmNE5534 will be a good solution.Its a low noise opamp built for audio purposes.Here is the datasheethttp://www.ti.com/lit/ds/symlink/ne5534.pdf

author: Zero999
author_rank: Super Contributor
timestamp: May 25, 2019, 10:22:11 pm
content: Quote from: Arjunan M R on May 25, 2019, 03:16:32 pmThat's a sensible enough suggestion. Don't forget the important 22pF frequency compensation capacitor in applications with a noise gain of under three.
An Easy Method Of Making An Inventory Of Your Components - Page 1
Forum section: electronics / projects

author: t1d
author_rank: Super Contributor
timestamp: September 22, 2021, 04:37:15 am
content: I did this in Mouser, so I know it works from there.I used LibreOffice-Calculate to create the spreadsheet., so I know that it works, too.I think I may have posted about using the Compare Function, before, but this thread will tell you how to get the information into a spreadsheet format.- Go to Mouser/Digikey/Etc.- Go to the product page for the component that you want to add to your inventory list.- On the product page, there is a box to add the component to the Compare Function. It is sort of small, so you may have to look for it. But, once you find the first one, it is in the same place on each product page. Check it. See picture below. Once you check the box, Mouser will list the number of items in the Compare List to the right of the box. I know that you can add items to the Compare Page directly from a general component search, but going to the exact component product page makes sure that you are getting the specifications for the exact product that you have on hand. Meaning, this method avoids selecting the same component by a different manufacturer that could have slightly different specifications, or a different pinout.- Repeat for up to a total of twenty components at a time. (That's all the Mouser Compare Function allows on one Compare Page. Be careful with the count, because Mouser will start rolling components off of the Compare page.)- After adding the last component, click on the number of compared items to the right of the Compare Check Box. You should see a spreadsheet of all the components and their specifications.- Save this webpage as .htm- Open the .htm with a spreadsheet app.- You will see lots of lines of information about stuff that is not about your components. Scroll down to the component detail cells. Delete the cells that do not contain useful information.- Save this new document in a spreadsheet format. I used .xls.- Repeat the process for component categories where you have more than twenty of that type of component type.You should now have access to all the data within the spreadsheet and you can manipulate it as you like, such as combining multiple pages of a single component type. I think that the hyperlinks are actually active and will take you back to the component webpage.I am not a super computer person, so there may be an easier way to get the information off of the Compare Page and onto a spreadsheet. So, suggestions are welcome.I hope this helps to make your day nice and sunny.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 22, 2021, 03:36:06 pm
content: Lookup info is available via web APIs as well -- though I don't know if anyone's written an Excel or LOC plugin/script specifically, to connect to it.Tim
An Electronics Storage Solution - Page 1
Forum section: electronics / projects

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 25, 2017, 01:49:58 am
content: Something I came up with -- just thought I'd share.Use photo storage boxes, stored on a bookshelf. Each photo storage box has a handy front label you can change at will by sliding in a new label. The bookshelf is adjustable and has twice the shelves, made of MDF (sorry for the unpainted one in the photo below -- need to finish that). Each photo box can contain a dozen $1 (from China ebay) plastic organizers. Each organizer holding potentially hundreds of tiny components. Each $1 plastic organizer can have it's own label on the side, so you can immediately find what you are looking for after pulling off the shelf. Also there can be labels on the bottom or top of the $1 organizers for each compartment.You can use the photo storage box for other things as well as shown in photo. (Acrylic paints, medicine, tape etc.) And use the bookshelf for a hybrid of things.

author: MarvinTheMartian
author_rank: Frequent Contributor
timestamp: February 25, 2017, 02:13:11 am
content: For someone who is "I am not the most tidy at times lol." you seem to be very organised.Well done!I've yet to sort out my storage solution for parts (and to acquire most of those parts too - I've got a bunch of through hole stuff that is about 30-40 years old!)

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 25, 2017, 02:16:47 am
content: Quote from: MarvinTheMartian on February 25, 2017, 02:13:11 amLOL. The shelf needs painting and I am sure it needs dusted as well.

author: JenniferG
author_rank: Frequent Contributor
timestamp: February 25, 2017, 02:18:57 am
content: What I also like about the width of these photo storage boxes, is that they aren't too wide for designing (in OpenSCAD or Sketchup) & 3D printing custom trays for various components (or small tools, etc.).I pickup the photo storage boxes any time I see them at the flea market for like 25 cents to 50 cents. Then I use 40-50% off coupons when I get them at the craft stores -- daily coupons & printable off michaels.com, hobbylobby.com & joanne.com web sites; usually get them for about $2 each.

author: mpicker21
author_rank: Contributor
timestamp: February 25, 2017, 03:50:01 am
content: I use similar plastic containers for storage. I got mine at one of the outdoor stores (Bass Pro Shops or Gander Mountain). They are with the tackle boxes. They work great and with them being semi-transparent you can see what's in them without opening each one.
An Electronics Workstation - Page 1
Forum section: electronics / projects

author: rhb
author_rank: Super Contributor
timestamp: September 14, 2018, 11:06:46 pm
content: After much agony it's finally done. Clearance conflicts required several iterations.The reason for this effort is a significant space which otherwise would be inaccessible and unused.In particular I call attention to the folded aluminum tool holder. With the metal bent, it's the work of a few minutes to make a custom tool holder. Just drill holes.In a future version, I'd use a single flat plate across the bottom. Both easier and stiffer.The soldering station is on a lazy susan, then the iron holders and the tools are on cheap LCD monitor mounts.

author: rhb
author_rank: Super Contributor
timestamp: September 14, 2018, 11:10:17 pm
content: A few more

author: rhb
author_rank: Super Contributor
timestamp: September 14, 2018, 11:11:20 pm
content: And the last one.
An idea on using Vicor DCDC converters as a CC lab PSU? - Page 1
Forum section: electronics / projects

author: Boscoe
author_rank: Frequent Contributor
timestamp: March 21, 2023, 07:27:31 pm
content: So Vicor converters look fantastically engineered. They have some products in their line up that are capable of CC operation using their adjust pin called the SC pin. One can modulate the output voltage of these converters from 10% to 110% of their nominal output voltage at the sacrifice of output power (current capability does not increase) and the requirement for a minimum load current at low output voltages.10% is both very far but also reasonably close to 0%for it to be usable for a CC bench PSU with some nice opamp control loops and a few voltages source that's capable of sinking to take up the slack. The benefit would be fairly easy and efficient, off-the-shelf lab PSUs. I wonder what people think to this idea and if they've thought about it before.Here are some linkshttps://www.vicorpower.com/dc-dc-converters-board-mount/high-density-dc-dc-convertershttps://www.vicorpower.com/documents/application_notes/an_ConstantCurrent.pdfhttps://www.vicorpower.com/documents/datasheets/ds_375vin-micro-family.pdf

author: jonpaul
author_rank: Super Contributor
timestamp: March 23, 2023, 02:58:08 am
content: Victor,are just foward converter with Vincerilli's lossless snubber.Perhaps not suitable for a lab supply.We use classic HP linear, with meters, Vand I variable to zeroj
An IoT development platform - Page 1
Forum section: electronics / projects

author: paulcav
author_rank: Contributor
timestamp: March 23, 2017, 06:24:40 am
content: Here is something i found in my travels of exploring IoT.The Internet of Things (IoT) is the network of physical objects or "things" embedded with electronics, software, sensors, and network connectivity, which enables these objects to collect and exchange data.https://www.losant.com/
An Open-Source, Modular, VR Drone based on Raspberry Pi - Page 1
Forum section: electronics / projects

author: AndrewLoomis
author_rank: Contributor
timestamp: March 17, 2018, 01:32:06 am
content: Hi, I'm a first-time poster, but I've been a fan of Dave and his forum for a while.I've been working on a open source project called the Thanics Halo drone, and I'm looking to see if electronics hobbyists would be interested in having a modern drone platform to put their circuits/modules on. There is a great open source project called Ardupilot that is good for getting a drone to fly, but that's pretty much it. I'm trying to make a drone that is very immersive using VR live streaming (with a 360 camera), and spherical obstacle avoidance (using stereo computer vision and laser rangefinders), and of course very hackable, both software and hardware wise.It is important to note that this project is far from complete, and not fully documented, but here's our GitHub repos (including ECAD files):https://github.com/ThanicsRobotics. You can also check out our websitethanics.com. The files and pictures on the website depict the V2 drone, and we are now working on V3 (which we will be publishing PCB/MCAD designs soon), which is far more efficient, smaller, and 3D printable.I'm envisioning having multiple modular "bays" with a suite of interfaces (UART/I2C/SPI/USB) to the host processor (Raspberry Pi CM3), so that hobbyists can easily design their own boards to interface with the drone. I figured this was the forum to ask to give me honest feedback. Thanks ahead of time.
An unknown/missing ic needs replacing - Page 1
Forum section: electronics / projects

author: K-Experiment
author_rank: Contributor
timestamp: October 04, 2019, 05:44:19 am
content: I want to make my own soldering station and i was thinking of creating a hakko 936.but there is one ic that i couldnt buy from lcsc so can you help me?the ic is a low power quad op amp: Nec uPC324and if i may ask, how much current does it need from the transformer? is it 2.5A?

author: oPossum
author_rank: Super Contributor
timestamp: October 04, 2019, 05:49:05 am
content: https://lcsc.com/search?q=lm324

author: K-Experiment
author_rank: Contributor
timestamp: October 04, 2019, 06:13:05 am
content: sorry im still new to electronics and im quite bad at reading datasheets butare you sure its an exact replacement?

author: ledtester
author_rank: Super Contributor
timestamp: October 04, 2019, 03:42:28 pm
content: It's the same "324" op-amp. TI uses an "LM" prefix whereas NEC uses "uPC" to identify its parts.Attached are the datasheets. Note that the schematic diagrams are identical save a current source of 4uA in the TI diagram which has a value of 6uA in the NEC version.I bet the uPC324 was the chip the author found on his board when reverse engineering it, but they wrote "LM324" next to all of the op-amps to indicate than any 324 op-amp would work.

author: amyk
author_rank: Super Contributor
timestamp: October 04, 2019, 07:38:45 pm
content: The uPC1701C is going to be the hardest part to get if you want to make a "true" 936 clone.All the clones available use something simpler and cheaper instead, but some of them are designed for thermocouple sensors; here's one that uses the original thermistor type sensor:https://ai.esmplus.com/jnkgloballtd/solderingstation/lm358_simple.png

author: ledtester
author_rank: Super Contributor
timestamp: October 04, 2019, 08:03:03 pm
content: Here's an eevblog thread on suitable replacements for the 1701:https://www.eevblog.com/forum/projects/finding-an-obscure-part-for-the-hakko-936b-(nec-upc1701)/

author: K-Experiment
author_rank: Contributor
timestamp: October 05, 2019, 12:40:04 pm
content: so the uPC1701 can be replaced with a UAA2016?
An update on my sequencer project! It's finally functional - Page 1
Forum section: electronics / projects

author: Niisse
author_rank: Newbie
timestamp: July 28, 2022, 07:45:23 pm
content: Hey all,So, about a year ago I posted a video of my work in progress sequencer - back then it didn't sequence much. I've just finished work on my second video showcasing much of the progress I've made. The sequencer is now at a very functional stage, and this first prototype is nearly finished. It's my first electronics project, and I'm really stoked to see how well it's working already! It's essentially a MIDI-based sequencer written in Python, with custom hardware controls. It currently runs on a Raspberry Pi, but eventually I hope to convert it to something Arduino-based to make it truly portable (an RPi is, of course, a bit overkill - albeit easy to develop for)I'd love to hear what you think! Any feedback or (constructive) criticism is appreciated.

author: RJSV
author_rank: Super Contributor
timestamp: July 29, 2022, 05:00:50 am
content: Nice look, to your board layouts...that shows a sharp mind, and some artistic bend!I've moved on, to your Helium vintage Pipe Organ video, that's a lot of work, (and fine old wood). What year was that made, and now, I'm going to try to find the previous Parts, 1-4 on that!Might be nice, to hear a few words on your sequencer program aspects, too.Thank you ! - -Rick.

author: Niisse
author_rank: Newbie
timestamp: July 29, 2022, 07:22:01 am
content: Hey Rick,That Helium Pipe Organ video must be by LookMumNoComputer - great guy, but it's not me! Thanks for the kind words, however.The program is essentially a big list of lists - keeping track of what plays when, and outputting the correct MIDI data at the right time. The relevant bits of the internal state of that program then get transformed into a long string of bits, which gets sent into the output shift registers of the hardware - causing the 7-segment displays and LEDs to light up accordingly.Meanwhile, the input shift registers check for any button presses. If a button gets pressed, the relevant function (such as "toggle play/pause", or "move one step forward", or "turn on sustain for this step") gets executed.The code can be found inthis GitHub repository, for anyone interested.

author: KellyGreené
author_rank: Newbie
timestamp: August 02, 2022, 03:30:16 pm
content: Your board's layout for the sequencer is insane. Shows a lot effort and talent put into it.I came across this sequencer project earlier this yearhttps://www.pcbway.com/project/shareproject/Santa_s_sequencer.htmlbut looking at all the steps it requires made me put it on hold to focus on other projects. Seeing your progress, I think I'll add it to my projects for this month.
Analog ADE7953 : bad phase angle read - Page 1
Forum section: electronics / projects

author: bouli
author_rank: Newbie
timestamp: August 12, 2014, 01:26:55 pm
content: Hello,I develop a project around ADE7953 from Analog Device. When I read ANGLE_A (0x10C) register value 0xFB80 (-92*) is returned. but the value that I measured on scope is -30° (0xFE80). My load is just 4*35W 220V halogene lamp (no transformer). The current is measured with a CT JC10F.Do you ever encounter such kind of problem ? Values of voltage and current read from registers are correct.The input stage or my board is a copy of the evaluation board of Analog device.Here is the value the I sent to ADDE7953 at startup :Code:sADE7953_WriteReg(ADE7953_REG_PGA_V, 0);sADE7953_WriteReg(ADE7953_REG_PGA_IA, 0);sADE7953_WriteReg(ADE7953_REG_PGA_IB, 0);sADE7953_WriteReg(ADE7953_REG_AVGAIN, 0x3E270E);sADE7953_WriteReg(ADE7953_REG_AIGAIN, 0x3E3924);sADE7953_WriteReg(ADE7953_REG_PHCALA, 0x000);sADE7953_WriteReg(ADE7953_REG_ZXTOUT, 1400);sADE7953_ReadReg(ADE7953_REG_CONFIG, &uldummy);uldummy |= HPFEN | INTENA | ZXLPF;sADE7953_WriteReg(ADE7953_REG_CONFIG, uldummy);sADE7953_WriteReg(ADE7953_REG_CFMODE, CF1DIS | CF2DIS);sADE7953_WriteReg(ADE7953_REG_IRQENA, ZXTO_IA | ZXTO | CYCEND);Thank you for your help.Best regards.
analog and digital circuit  - Page 1
Forum section: electronics / projects

author: Alex QW
author_rank: Contributor
timestamp: August 17, 2023, 03:14:46 pm
content: Hi all,I am a newbie in designing analog and digital circuits and I always find that hard and no idea to start designing digital and analog circuits from scratchAny solution or suggestions to improve my analog and digital designing skills?FromAlex

author: themadhippy
author_rank: Super Contributor
timestamp: August 17, 2023, 03:49:28 pm
content: break what your trying to do into small blocks,then google (other search engines available) those small blocks andsteeluse the results as inspiration for your design.

author: TimFox
author_rank: Super Contributor
timestamp: August 17, 2023, 04:03:53 pm
content: Serious suggestion: first start by defining the function of the circuit you want to design.If it is an amplifier, you should define the gain (e.g., voltage gain), expected input voltage range, bandwidth (including down to DC, if necessary, or low-frequency response for AC amplifier).Further requirements include input impedance, output current capability, etc.These are all quantitative: you can apply them to basic circuits found in textbooks to get what you need.

author: tggzzz
author_rank: Super Contributor
timestamp: August 17, 2023, 04:57:35 pm
content: Quote from: Alex QW on August 17, 2023, 03:14:46 pmHave you specified, designed, implemeted, and tested something other that analogue and digital circuits? If so, use the same processes.What experience do you have with analogue and digital circuits?

author: Alex QW
author_rank: Contributor
timestamp: August 18, 2023, 01:22:05 am
content: Hi TimFox,Should I read back all the fundamental theories of digital and analog electronics I feel that my fundamentals are not strong enough but doing it in this way will be time-consumingFromAlex.

author: TimFox
author_rank: Super Contributor
timestamp: August 18, 2023, 02:48:16 am
content: It never hurts to review the fundamentals.If you are in a hurry, go to one of the "cookbook" style books, find a basic circuit, and apply my suggestion to impose your quantitative design requirements on it.

author: Alex QW
author_rank: Contributor
timestamp: August 18, 2023, 02:50:00 am
content: Hi Timfox,May I know what is a cookbook?FromAlex.

author: TimFox
author_rank: Super Contributor
timestamp: August 18, 2023, 02:52:35 am
content: Examples: W G Jung: "IC Op-Amp Cookbook" (1974).https://www.milanmedia.pro/ic-op-amp-cookbook-by-walter-g-jung/for a pirated PDF.

author: Alex QW
author_rank: Contributor
timestamp: August 18, 2023, 02:58:39 am
content: Hi Timfox,IS this book a cookbook (Introductory Circuit Analysis by Boylestad)FromAlex

author: TimFox
author_rank: Super Contributor
timestamp: August 18, 2023, 01:47:16 pm
content: No, that's a textbook."Cookbooks", in this context, are books showing examples of working circuits with short discussions of details.The Jung book I mentioned is perhaps the first book to use that term."Textbooks" cover the subject from first principles.Both are useful.
Analog audio to SPDIF TOSLINK conversion help - Page 1
Forum section: electronics / projects

author: nisarali0420@gmail.com
author_rank: Newbie
timestamp: October 16, 2024, 01:46:25 pm
content: Hi there I need to build a adapter that takes in analog audio from 3.5mm headphone jack and RCA inputs and convert it to SPDIF TOSLINK at the outputwhat IC should IC use and what EVM can i followI don't want to go in to DSP, and don't want to use CIRUS logic IC's
analog circuit design with examples questions - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: April 23, 2025, 08:44:11 pm
content: Hello, In the manual below there is theory with practical design example in the end as shown below.However Is there some source where I could find similar circuits with theory and practical example implementing the theory?Thanks.https://aicdesign.org/wp-content/uploads/2018/08/lecture19-150211.pdf

author: eutectique
author_rank: Frequent Contributor
timestamp: April 24, 2025, 06:12:13 pm
content: Quote from: john23 on April 23, 2025, 08:44:11 pmYou can find plenty of material here, for example:https://technion.primo.exlibrisgroup.com/discovery/collectionDiscovery?vid=972TEC_INST:972TEC_V1&collectionId=81159520910003971
Analog Devcies Stability 101 video series - Page 1
Forum section: electronics / projects

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 24, 2013, 11:35:52 am
content: Nice quick & simple video series explaining opamp stability issues :

author: Rerouter
author_rank: Super Contributor
timestamp: March 24, 2013, 12:02:09 pm
content: too late to watch all of them tonight, but so far seems quite well done, here's the serieshttps://www.youtube.com/playlist?list=PLiwaj4qabLWwAenk99ONF2_JUjopeAXo4mike though its a bit off topic, would you know of where to find the schematic for a psu with external sense lines, 90 degree shift per amplifier has been killing me.... and still coming to terms with how the zero and pole method works :?

author: Chryseus
author_rank: Regular Contributor
timestamp: March 24, 2013, 01:19:54 pm
content: Thanks mike, exactly the sort of thing I was looking for!
Analog Devices ACS software with AD7606-18  - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: July 14, 2021, 07:41:37 pm
content: Hello, I am interested in trading notes with anyone using the subject software, specifically if used with the AD7606-18 (or -16) DAS chip and support board.I've had great results using the 8 channel board, collecting samples, over-sampling, etc. It has exceptionally low noise, wide bandwidth up to 1MSpS but then there are applications that don't make sense.For instance, I have an SSM2019 single-ended amplifier being used to measure power supply noise with my HP3562 displaying the FFT. The amp has 60db of gain. When displayed on my HP3562, the noise level is across ~-80dB level (including 60dB of gain, actually ~-140). You would expect the AD7606 with at least that much dynamic range to see -80 and on other outputs it does. For instance if I run an AC 1Khz signal into the amp, I get the expected output. But for some reason the very low frequencies near DB (<1hz) are displayed on the ACE software FFT very high (0db) and masking the lower numbers with a display of -300dB when I try to profile a power supply DC output. I tried additional filtering to take that lower stuff out with the same results.I realize this is confusing without pictures, plots etc. and I'll try to post some up if I get my GPIB running with the 3562.ThanksJerry

author: moffy
author_rank: Super Contributor
timestamp: July 16, 2021, 03:07:03 pm
content: Could it be related to 1/f noise which is well known?

author: cncjerry
author_rank: Unknown
timestamp: July 22, 2021, 07:08:42 am
content: What I found was that the ssm2019 for some reason related to input bias I assume, was causing the output to flip to either the negative rail or positive depending on the input unused. This caused the input caps to charge on the DAS board overloading the input. So not having a ton of experience with the ssm2019 in single ended mode. I switched now to the circuit from Jim William's AN83 as it has equal or better NF compared to the ssm2019, works, and I'm more familiar with the layout.What I am doing is measuring power supply noise. I am building a standalone unit with battery supply using the dewalt 20v batteries. I'll put a few diodes inline to drop the voltage to something a little lower than 18v, and go from there. A pair of 20v batteries each having 4AH will last for many runs.By the way, for the money, this 8 channel, 18 bit, 1MspS DAS with over sampling has very nice dynamic range. The ACE software is lame so I use it to capture data and then process it with Octave or Matlab. I plan to setup so the channels can be used in a simple average instead of over sampling. The board is cheap at $64 but the support board isn't.Jerry
:: analog devices excel sheet :: - Page 1
Forum section: electronics / projects

author: 3roomlab
author_rank: Frequent Contributor
timestamp: December 06, 2013, 02:52:29 pm
content: hi folks just a weird problem, does this work on openoffice calc? or it strictly uses MS excel? cos it does not seem to do anything on my open office? any hint appreciated... cheershttp://www.analog.com/en/power-management/switching-controllers-external-switches/adp1621/products/product.html

author: engineerbynight
author_rank: Newbie
timestamp: March 09, 2014, 09:30:25 pm
content: Post any questions you have on that part, and that excel sheet here:http://ez.analog.com/community/powerThey'll be happy to help you out.-Anne
Analog Devices QMX02 Module information - Page 1
Forum section: electronics / projects

author: bborisov567
author_rank: Regular Contributor
timestamp: May 15, 2024, 09:51:50 am
content: I am trying to find information about Analog Devices QMX02 Four channel RTD/Strain Gage conditioner module but there seems to be pretty much nothing on the web. I tried searching the databooks but still nothing comes up as QMX02. The closest thing i managed to find is 2B34 module which seems to be quite similar. Does anybody know whats behind the QMX02? Maybe just a rebranding? Also a datasheet would be much appreciated!
Analog digital ground overlap - Page 1
Forum section: electronics / projects

author: vignesh_shan
author_rank: Contributor
timestamp: October 28, 2020, 01:45:24 pm
content: Hi ,In one of my IC, we are using 12 layer PCB. Can analog and digital planes overlap each other but there ground plane in between these two layers. As shown in the image. (Pink colored shape is analog domain plane, red colored shape is digital, in between these two layer there is gnd layer).ThanksVignesh.M

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 29, 2020, 01:50:24 am
content: As far as I know separate GND planes for digital and analog is deprecated in most situations.One big GND plane is usually best.But there are caveats.You have to visualize how the currents flow through the GND plane, and keep the currents from analog sections far away from currents through digital sections.With your layout you will have currents through the GND plane which will induce noise into the analog plane, which is far from optimal. It would be much better to locate the analog stuff in a corner of the PCB, or if it really needs to be in the middle, (vertically) then move it to the side (left or right), remove the digital GND plane under it, and make the digital GND plane on the other side as wide as feasible.

author: vignesh_shan
author_rank: Contributor
timestamp: October 30, 2020, 04:13:36 pm
content: Hi Doctorandus_P,Thanks.
Analog discovery 2 & The art of electronics - Page 1
Forum section: electronics / projects

author: stoica adrian
author_rank: Contributor
timestamp: April 30, 2018, 01:19:28 pm
content: Hello,I have the art of electronics and learning the art of electronics.My question is: can i use Analog discovery 2 for simulating all of the labs and project in this great book?

author: rstofer
author_rank: Super Contributor
timestamp: April 30, 2018, 02:41:45 pm
content: All? That assumes that anybody around here has done all the experiments and, having thumbed through the book, that seems unlikely.What you can do is modify the experiments as necessary for the equipment at hand. The 'recommended' prototype system is the Global Industries Proto-Board PB-503. It has a lot of nice features but in no way does it compare to the AD2.One difference, the power supply voltages are limited on the AD2 so you may need an external power supply. Wall warts might be sufficient. Batteries are a possibility or you can just buy an inexpensive lab supply. This will almost certainly come up for Op Amps where you will probably need a +- 15V supply (I say without having read the manual thoroughly). Remember the ratings for the AD2, don't get carried away with higher voltages. Buy the BNC adapter and use 10x probes if necessary. It may not make sense right now but you lose the ability to float the scope channels when using the adapter and this severely restricts the differential capabilities of the AD2 - right down to where normal scopes work (without a differential probe). For the most part, if you are using the power supply from the AD2, you don't need the adapter.What you won't find is more test equipment for the money. Just try to find something that will do what the Network app does: Bode' plots of magnitude and phase - this is critical to the study of filters and amplifiers. It also does a nice job for Fast Fourier Transforms - better than the Rigol DS1054Z within its frequency capabilities.Having a dual channel scope is nice but adding a dual channel arbitrary waveform generator is really helpful.If you have questions about how to adapt specific experiments to the AD2, just ask. There's always a way to get a similar result.Here are some tutorials about the AD2https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/start?redirect=1FWIW, the PB503 is a lot more money and has none of the important features of the AD2https://www.amazon.com/Global-Specialties-PB-503-Digital-Workstation/dp/B005S3SC0E

author: rstofer
author_rank: Super Contributor
timestamp: April 30, 2018, 03:06:59 pm
content: Maybe the Digilent Power Bricks can help with the power source issue. Note that these are dual supplies so the 12V module gives +- 12V which might be perfect for most op amp circuits. +-15V would be better but the experiment can be scaledI would use these with a powered USB hub. I'm not much into providing project power from my PC.https://store.digilentinc.com/powerbricks-breadboardable-dual-output-usb-power-supplies/
Analog Discovery SDK for creating custom instrument functions? - Page 1
Forum section: electronics / projects

author: AcHmed99
author_rank: Contributor
timestamp: February 28, 2016, 01:10:49 pm
content: Does anyone know of any examples of using the Analog Discovery SDK for creating custom instrument functions?What I would like to do is be able to set the amplitude over frequency ranges in the network analyzer. For example, I might want an amplitude of 800mV over 10Hz to 400Hz then 50mV over 401Hz to 100kHz then back to 800mV.The application is for Loop injection for DC/DC converters.https://www.maximintegrated.com/en/app-notes/index.mvp/id/3245At low frequency and beyond the crossover the signals (Vo/Vi) can vary by 40dB or better. Trying to pick off a 1mV or so signal in a noisy say switching converter would be difficult to say the least. Variable amplitude over frequency is how dedicated FRA’s deal with this problem.An example picture of the problem is below.I am using high-speed op-amps (OPA2354 or OPA365) AC coupled through BNC connectors to the test circuit. I’m using these as 5x gain block.I’m also open to alternate suggestions, other than buy a $10k FRA of course. I’m not being overly ambitious a frequency range from 100Hz to say 500kHz would be fine. I already have a transformer that gives me a flat response over 400Hz to 1 MHz.

author: jaxbird
author_rank: Frequent Contributor
timestamp: May 23, 2016, 01:40:46 pm
content: I was just searching for some of my Analog Discovery related threads and saw yours in the list. I've done quite a lot of development using the Analog Discovery API (impedance analyzer, audio analyzer etc), I realize it's an old question, if you are still interested feel free to ask, I have created a managed wrapper for the API for use in C# if you are interested.

author: jaxbird
author_rank: Frequent Contributor
timestamp: May 28, 2016, 04:34:20 pm
content: Quote from: AcHmed99 on May 23, 2016, 11:23:44 pmSorry I have no experience writing plugins for the Waveforms software, all my projects have been based on the direct API, but always happy to add new uses to this instrument. It sounds like all you'd need is a network analyzer where you can specify a list of start/stop frequencies with an associated output level.Thanks, the impedance analyzer has been an interesting project.
Analog ESR meter with linear scale? - Page 1
Forum section: electronics / projects

author: dardosordi
author_rank: Regular Contributor
timestamp: February 18, 2017, 06:00:37 pm
content: Hi,Im looking for a schematic or some pointers on how to build an analog ESR meter with linear scale.I've built one with log scale in the past, it served me well, but the enclosure was pretty bad and it ended up falling apart. So I bought a non-working Power Instruments B-891 Tachometer to use for enclosure, and it has a really nice analog display with linear scales. I was wondering if its possible to build an analog ESR meter with linear scales, so I don't have to re-do the scale markings.It comes with dual scale: 0-10/0-3 and has a 4 pole-5 position rotary switch that I could use to implement different ranges, but I first need to get a circuit with a linear response. It also has a nice calibration pot wit a shaft made for a screwdriver.Any help is appreciated.Im attaching pictures of the tachometer, the batteries had leaked and it was missing the sensor, so it didn't seem worth repairing.

author: Kalvin
author_rank: Super Contributor
timestamp: February 18, 2017, 06:34:01 pm
content: Like this?https://www.eeweb.com/blog/extreme_circuits/esr-low-resistance-test-meter

author: dardosordi
author_rank: Regular Contributor
timestamp: February 18, 2017, 07:09:55 pm
content: Quote from: Kalvin on February 18, 2017, 06:34:01 pmThat actually might work, thanks!

author: dardosordi
author_rank: Regular Contributor
timestamp: February 18, 2017, 07:22:41 pm
content: Kalvin,you made me realize the problem with my search was that I was looking for "analog display" and "linear scale", but the way the scales on this meter are any of the ESR adapters that are designed to work on DMM will work.Thank you very much, I'll go with this onehttps://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/and post the results here.

author: hugo
author_rank: Regular Contributor
timestamp: February 22, 2017, 02:12:53 am
content: An analog one by the same designer, Jay_Diddy_B here :https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/
analog filter stability ideas - Page 1
Forum section: electronics / projects

author: phil2014
author_rank: Newbie
timestamp: April 05, 2016, 02:28:54 am
content: Hi all,I have the following LTSpice low pass filter circuit simulation and resultant ac analysis (full ltspice project is attached). The problem is that the first filter stage oscillates in my test PCB - even without load (delete R1). The second stage is stable.I am looking for ideas on how to improve circuit stability and am hoping someone with more experience can guide me in the right direction.Regards

author: R_G_B_
author_rank: Frequent Contributor
timestamp: April 05, 2016, 07:32:02 pm
content: This is useful to watch on amplifier stability:R_G_B

author: phil2014
author_rank: Newbie
timestamp: April 05, 2016, 07:46:00 pm
content: Thanks. For the link. After reading up a bit more I decided to increase the phase margin by reducing band pass ripple. The circuit no longer resonates

author: diyaudio
author_rank: Frequent Contributor
timestamp: April 08, 2016, 10:28:38 am
content: Quote from: R_G_B_ on April 05, 2016, 07:32:02 pm
Analog front end design of FDXB RFID tag reader - Page 1
Forum section: electronics / projects

author: lostengineer
author_rank: Newbie
timestamp: June 22, 2025, 02:27:08 am
content: I’ve been struggling with a RFID reader for animal tags for the past couple weeks, and could really use some help to improve my design. I’m at the very limits of my analog front-end op-amp design knowledge and likely screwing up a ton of stuff.These animal tags are “FDX-B” animal tags that use 134.2kHz carrier frequency (fc) and modulate with a biphase encoding scheme (1’s at 1/32 fc and 0’s at 1/16 fc {so 4.2kHz and 8.4kHz is the data I have to preserve}). Protocol described herehttps://www.priority1design.com.au/fdx-b_animal_identification_protocol.htmland herefdxb reader on githubI need to build a small reader into a handheld device that can read a tag at 5+ CM away. The issue is range.My current design works to about 1-2 CM which is not enough. The front end uses several op amps that attempt to extract, filter, and amplify the very small modulated signal into a nice 3.3v square data pulse. This pulse is then fed into a microcontroller where an interrupt is triggered and parsing happens based on pulse widths (code works).I started with tons of research, and all the designs I could find more or less use this chain: AM peak detector -> passive (RC) filter to start knocking off the 134.2kHz carrier -> several stages of op-amp gain together with active 134.2kHz carrier removal -> into comparator/Schmitt trigger for final cleanup -> MCU interrupt pin.My take with this was to have a gain stage followed by a Sallen-Key filter stage for carrier removal – followed by tons more gain. When bench testing, I found cranking the op-amp gain crazy high gave me the best results across the board. But now I think I went overboard. I never got past about 2CM read range, and looking at it in more depth I believe I’m simply saturating all the op-amps immediately, and not really processing the signal properly. So, then, when the tag is far away, the processing chain simply does not work when the signal is truly weak.Any feedback on this design or advice? Below / attached is schematic and a bunch of scope pics. Thanks!
Analog Front End question on VSP25642PT - Page 1
Forum section: electronics / projects

author: bmxsesh
author_rank: Regular Contributor
timestamp: December 18, 2024, 12:11:57 pm
content: Dear Forum,Does anybody know what is the "converging time of the optical black loop"? Do I understand correctly that it means how long it should take to charge the capacitor during the OB pixel readout? So if I have 38 ob pixels at the beginning of each line of my CCD sensor then that COB capacitor mentioned in the data sheet has to charge up to the OB voltage in T seconds or under?Sincerely,M. Bondaruk