hybridfree/eevblog-posts huggingface dataset:
Project Ideas - Page 1
Forum section: electronics / projects

author: Sangharsh Sharma
author_rank: Contributor
timestamp: September 09, 2019, 07:38:36 am
content: Hello everyone... I'm looking for some innovative projects as a third year electronics student. I want to do something that involves Arduino and microcontrollers and that involves many electronic components...I hope that you can give me some creative ideas...

author: BravoV
author_rank: Super Contributor
timestamp: September 09, 2019, 07:43:01 am
content: Your own competency/skill and budget ?This matter much on what people will suggest, otherwise the whole thing will be useless.

author: Rerouter
author_rank: Super Contributor
timestamp: September 09, 2019, 07:46:30 am
content: give some kind of ballpark, what things are a general yardstick for third year projects,

author: ogden
author_rank: Super Contributor
timestamp: September 09, 2019, 07:58:04 am
content: https://lmgtfy.com/?q=useless+box+arduino

author: Fire Doger
author_rank: Regular Contributor
timestamp: September 09, 2019, 08:42:40 am
content: https://www.eevblog.com/forum/projects/diy-programmable-dual-channel-bench-psu-0-50v3a/ArduinoMany componentsGood luck
Project Ideas. - Page 1
Forum section: electronics / projects

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: February 02, 2013, 01:47:28 pm
content: Hey guys after the 555 timer projects i did and the Lm386 Audio amplifier circuit i have nothing to do so it would be cool if you suggested me an Ic to use or a project to search and build.
Project - Making Lockwood 001Touch Keyless Digital Deadlatch Wifi - Page 1
Forum section: electronics / projects

author: kingkongw24
author_rank: Newbie
timestamp: February 06, 2021, 02:16:57 am
content: Hi all,I've had this project of mine in my head for many years now, I've got this keyless digital lock that's only got a touchpad with a backup 9v terminal on the underside of the touchpad that can be programmed with codes for different people, and I can also add a temporary visitors code but to do this I will have to manually configure it for a said amount of time lets say 5 hrs from the time it was configured then it will expire automatically.The problem is that if I have a visitor show up, I can currently see them on my security system but can not unlock the door remotely. i will have to give them a passcode that I've already set up as they have just shown up and I have not set up a temporary code.From my observation so far, the device activates a solenoid for 7 seconds once the correct Pincode is input, once 7 seconds is up then it activates again back to the locked position.So this lock is a deadlatch, different from a deadlock that most Wifi locks are, as deadlocks retract a barrel then after a while engages, while this deadlatch solenoid active or not, still allows the door to self-close and "latch" into place.The question is do I find the solenoid wires and have some kind of wifi device (not sure what to use yet) power the solenoid directly and bypass the current PCB or do I find a way to use the board its self to activate the solenoid. The entire lock is powered by 4x AA Batteries.Either way I need a device that also has a power source that will need to be constantly powered and waiting for a wifi signal to activate some kind of relay that then activates this solenoid for the lock.Any suggestions on how I should attack the problem and what should I use for the wifi part.I'm not that confident in tracing and reading boards to find the right terminals and stuff.The following is the product specs and install images.Lockwood 001Touch™ Keyless Digital Deadlatchhttps://www.lockweb.com.au/en/lockwood-products/keyless-entry/001touch-keyless-deadlatch/https://www.lockweb.com.au/Local/AU/Technical%20Downloads/Lockwood/Keyless%20Entry/001%20Touch%20Keyless%20Digital%20Deadlatch/001%20Touch%20Installation%20Instructions.pdf

author: Ian.M
author_rank: Super Contributor
timestamp: February 06, 2021, 02:34:39 am
content: Its not worth hacking the lock. Simply add an electric door-strike. As it replaces the existing door-strike on the frame, there are no problems getting 12V or 24V power to it.Personally, I'd be very reluctant to use WiFi for any sort of access control application. Manual door release buttons, or an off-the-shelf entryphone system hard-wired to the door-strike would be vastly preferable. N.B. the wiring *MUST* *NOT* run through any insecure areas.

author: kingkongw24
author_rank: Newbie
timestamp: February 09, 2021, 07:16:04 am
content: Very good point can add a simple door strike.Thank you, prob over thinking it haha
Project: Moving Head (showing) - Page 1
Forum section: electronics / projects

author: UltimateProjects
author_rank: Newbie
timestamp: August 15, 2015, 07:34:41 am
content: I finally my first project. In this first message I post some photos and I made also a short video to show the functions of my project.If you have question just ask. I will share other photos, also schematics if someone is interested in.

author: obiwanjacobi
author_rank: Super Contributor
timestamp: August 15, 2015, 07:58:48 am
content: Looks very good (not an expert though). That is quite some power you have there, how much do these leds/lights dissipate?I always admire people that finish a project with housing and all. Mine never seem to get past the proof of concept - mess of wires on the desk - stage...

author: UltimateProjects
author_rank: Newbie
timestamp: August 15, 2015, 08:09:37 am
content: Thanks. Sorry, I don't know exactly the lux of the LEDs.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 15, 2015, 08:47:39 am
content: good, must have some strong motivation to complete it all. now its time to bring all the beers, boyz and gals.... and get drunk in da house.

author: UltimateProjects
author_rank: Newbie
timestamp: August 15, 2015, 08:57:23 am
content: hahah yes now we can make some partys.Yah 9 months of work ...

author: SL4P
author_rank: Super Contributor
timestamp: August 15, 2015, 09:25:04 am
content: Did you write the code yourself, or lift the EPROM from a product?Nice work to pull all the different pieces together.What processor did you use? Can you post a close-up of the controller electronics?

author: UltimateProjects
author_rank: Newbie
timestamp: August 15, 2015, 10:06:19 am
content: Yes i wrote the code by myself. I'm not that experienced in programming + i needed 5 counters and the Atmega8 has only 3 so i decided to use 3 Atmega8(one for the LEDs , one for the Display and one for the Motors). Overall there are 4 circuit boards (Display, Stepper, Leds and Music). Here some photos:

author: SL4P
author_rank: Super Contributor
timestamp: August 15, 2015, 02:05:59 pm
content: Fantastic work, and a clever approach!I've repaired a number of moving lights in the last ten years, and I appreciate effort you've put in.Great.

author: UltimateProjects
author_rank: Newbie
timestamp: August 18, 2015, 06:00:46 pm
content: Thanks, yes i've put a lot effort in it.

author: rvalente
author_rank: Frequent Contributor
timestamp: August 19, 2015, 01:20:22 am
content: Nice, well done!!!Which stepper driver used?

author: ledfreak3d
author_rank: Newbie
timestamp: August 19, 2015, 05:26:14 am
content: Awesome project

author: UltimateProjects
author_rank: Newbie
timestamp: August 19, 2015, 08:28:48 am
content: Thanks, I have used 2 L6208 stepper driver.
Product Packaging Recommendations - Page 1
Forum section: electronics / projects

author: petersanch
author_rank: Regular Contributor
timestamp: June 20, 2019, 06:28:28 am
content: HelloI want to package a product in a custom box. Similar to how a Raspberry Pi is sold.Any tips where to get started? Are there popular manufacturers that make boxes like these with custom graphics at low volume (50 to 100 quantity) without costing an arm and leg?Cheers

author: sleemanj
author_rank: Super Contributor
timestamp: June 20, 2019, 06:40:20 am
content: I expect this is going to depend largely on your physical location, which is unknown.Anyway if you are in the US, a quick google sayshttps://packlane.com/might be up your alley.

author: petersanch
author_rank: Regular Contributor
timestamp: June 20, 2019, 07:29:59 am
content: Thanks. I found some options on Alibaba too. They are cheaper than packlane but don't know their quality. Does anyone have experience with Chinese vendors for this kind of packaging?
Project Proto-Setter, 20 years in the making - Page 1
Forum section: electronics / projects

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: September 20, 2016, 12:28:00 am
content: A long time ago in a galaxy far away.....well really it was just 20 years ago and about 100 miles away. I got my hands on a keyboard, from an already old at that time, type setting machine. Any for your young ones please go Google what a type setting machine is. So, I got this keyboard which was made in a nice sized, edged shaped box. It was gutted and a couple of strips of wide Velcro added to the top. I added a few pieces of Velcro to the bottom of my proto typing boards and could work on one project and pull up that board and pop another one done without having to destroy a project already build on the previous proto board.I dug this out of a box in the shed last year and tested out one idea quickly before committing it to a PCB and then it got stuck in a cabinet until this weekend. To give you an idea of what I was working on 20 or so years ago take a look at the photo of the stuff I pulled off the Velcro. That is a PSOC 1 programmer from an old Circuit Cellar promotion! The little perfboard next to it was a cobbled up affair to proved 9V power to the programmer and 5V to the proto boards.You may have noticed the 7 LED sized holes on the top right and the nifty 9.5"x0.5" red tinted plastic opening. My original idea was to put some sort of LED display in that area that would look cool and be useful for prototyping. Notice 'looks cool' was first on the list

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: September 20, 2016, 12:29:12 am
content: Here are a few more pictures, one of the inside and one in profile.

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: September 20, 2016, 12:35:39 am
content: I searched through my box off wall warts and found one from an old HP laptop that had the habit of eating the ends of the power cords. Then I had to scrounge in three more locations before finding the matching 'mickey mouse' power cord. This particular adapter provides 18.5V @ 3.5A which should be sufficient power.At this point I am considering:5V@1A+-15 @ ??Asomething variableI scrounged in my junk box and found a couple of small 5V DC-DC converters but I'm sure I have some larger ones around. I'll likely have to order some for the +- 15V, not sure what amperage to go for there. The variable part of the supply will be something from junk box parts.The 7 LED sized holes need to be filled with LEDs that serve a purpose. The red tinted plastic window also needs to be filled with some nifty display. Any thoughts? Seven segment, dot matrix?Since this was a prototyping area made from a type setting keyboard I thought 'Proro-Setter' had a good ring to it.
Project PWM2Laser - Page 1
Forum section: electronics / projects

author: Fab6657
author_rank: Contributor
timestamp: May 14, 2022, 05:57:14 am
content: Hello Dear Community.For my latest project, I did something I never imagined to do. I created a fully documented project from the beginning to the end for a small electronic module, PWM2Laser.This module is a PWM generator for testing the laser diode modules available on market. The documentation contains all necessary information (I hope have not forget important things inside)to be able to realize the PCB with CNC, and the software for the microcontroller. All files are provided on a MEGA share.https://mega.nz/folder/DxcWCTjY#7FqW5tAA5Tu5wK24QdsTsQMost important document is the pdf file : PWM2Laser V1.0.pdfHave a look, would be happy for any feedback.

author: rpiloverbd
author_rank: Regular Contributor
timestamp: May 17, 2022, 08:32:13 am
content: Thanks a lot for sharing with us.

author: Fab6657
author_rank: Contributor
timestamp: May 22, 2022, 05:06:07 am
content: Hello Community,I just updated the documentation file in version 1.01 (best printable format and small corrections).Wish you good reading for this project PWM2Laser.

author: Fab6657
author_rank: Contributor
timestamp: June 13, 2022, 03:35:10 pm
content: Hey Community,The PWM2Laser project get a new upgrade, review of the blue led blinking sequence, couple optimisations in source code and in documentation.The project folder link is still the same as in the first post.Wish you good reading...
Project suggestions?  - Page 1
Forum section: electronics / projects

author: Ian
author_rank: Contributor
timestamp: April 06, 2011, 01:34:38 am
content: HiI would like some ideas for project ideas. nothing to pricey. no more then $50. anything just suggest

author: Simon
author_rank: Unknown
timestamp: April 06, 2011, 07:01:31 am
content: well what sort of stuff do you like doing ? does the money have to include a case or just the board. you can do many things with 50 bucks

author: deephaven
author_rank: Frequent Contributor
timestamp: April 06, 2011, 09:06:20 am
content: How about an automatically set clock? You can get seven segment displays very cheaply, so with those and a PIC you could make a clock. Then you could add a receiver module to receive DCF77, MSF60 etc (depending on where in the world you are) which would continually update the clock with very high accuracy. You can choose to make the receiver part yourself or buy a cheap receiver module already built.You would learn a lot of different technologies for quite a small outlay.

author: Ian
author_rank: Contributor
timestamp: April 06, 2011, 12:38:10 pm
content: Well the $50 needs to include everything. I live in the us. i wont any ideas

author: deephaven
author_rank: Frequent Contributor
timestamp: April 06, 2011, 01:13:58 pm
content: You can build my suggestion for under $50 all in. Just think how cool it would be to have a clock that doesn't need setting!Here's a link to the radio timecode system used by WWV in the US:http://en.wikipedia.org/wiki/WWVBIf you need any info about any aspect of what I've suggested, just ask.

author: Ian
author_rank: Contributor
timestamp: April 06, 2011, 02:15:29 pm
content: Any tutes
project: tracking generator synchronisation device - Page 1
Forum section: electronics / projects

author: kirill_ka
author_rank: Frequent Contributor
timestamp: July 24, 2019, 10:17:32 am
content: The basic idea is to use the RFExplorer signal generator as a tracking generator for HP8561E.Although my current implementation is built around the devices I possess, the idea can be extended for other spectrum analysers and/or signal generators. I plan to gradually release the implementation details for the case someone would find it interesting or even want to reuse my approach.Block diagramCode:+-----------------+ +-----------------+ +----------------+|RFE Generator | | Synchronisation | | HP 8561E || | | Thing | | || | | | +------------+ || | | | |85620 module| || | | SPI Slave|-------|GPIO/SBIT | || | | | +------------+ || | | GATE |-------|GATE (not used) || USB |--------| USB Host SWP |-------|AUX Sweep out || | ----| 5V power FAV |-------|Sweep out/FAV || | / +-----------------+ | || | | | || RF OUT|--------  -------------------|INPUT |+-----------------+ | +----------------+|Optional5V powersupply

author: kirill_ka
author_rank: Frequent Contributor
timestamp: July 24, 2019, 10:23:44 am
content: Tracking generator control/alignment UIAll the configuration is done through the custom menu on the HP8561E.This adds some convenience by not requiring a PC. Also there's some fun in programming 8561E in it's archaic language.The main "user keys" menu.Sweep alignment menu. Also shows the generator swept across 6GHz.Native tracking generator menu & normalised trace.

author: kirill_ka
author_rank: Frequent Contributor
timestamp: July 24, 2019, 10:24:20 am
content: HardwareThe hardware is built round the ATMega 348P microcontroller and the MAX3421E USB host controller. For now I'm using a couple of slightly modified of-the-shelf boards. The MAX3421E board is an Arduino shield, but I'm not using it as a shield. That's because the SPI slave interface (which is normally connected to the MAX3421E) is needed to communicate with the 85620 module. An easier way could be to use some Linux-based board, but I suspect I wouldn't be able to get precise timing from Linux. Also I want to be able to power it from the 85620 which only provides 150mA @5V.The whole thing is fitted into the shell of a dead LiPo charger.
Project: Trading card display pedestal - Page 1
Forum section: electronics / projects

author: tylerssims
author_rank: Contributor
timestamp: December 29, 2022, 11:26:46 pm
content: Figured I'd share some gifts I made for Christmas. I still need to upload the firmware this week, so I have a bit of work to do still.They are display pedestals for PSA-graded trading cards. The 14-segment displays show the value and population of each card. The displays connect to an Adafruit Huzzah (ESP8266 module). The intent is for the value and population to be automatically updated through a server. There is a nice package on GitHub for scraping the data for the cards, so I will be publishing that data to my server, which the ESP8226 will connect to.The front is made from Cherry, and the purple parts are all PLA/ PHA 3D prints wrapped in velvet. I had the aluminum machined locally, and the PCBs were made by Oshpark (also local to me). Each pair of displays is mounted on a board with an HT16K33 matrix driver chip.Let me know what you think; criticism is welcome:)https://imgur.com/a/s8zkXwj

author: BurningTantalum
author_rank: Frequent Contributor
timestamp: December 30, 2022, 02:05:21 am
content: OK, I'll bite on this: Every day a schoolday, but having Googled 'PSA trading cards' I am still no wiser as to what they are and why they need a display case with electronics and alphanumeric displays. Are they a modern day incarnation of 'Bazooka Joe' cards?

author: tylerssims
author_rank: Contributor
timestamp: December 30, 2022, 02:25:14 am
content: Haha, that's a great question. I am not too into cards myself, but my family is. PSA is one of the biggest grading companies. You send your cards into them (sports cards, pokemon cards, whatever), and they grade it on a scale of 1-10, give it a serial number, and seal it in a special case. Cards are pretty much worthless to a collector unless it's graded.There is a website that keeps track of the current value of the card (looks at the last auction price). You can also see the population (how many exist) of that specific card at that grade. My display shows the updated value and population of a card. Some of these PSA cards are worth thousands of dollars, so that's why you may want a unique display!Essentially the display shows how much the card is worth and how rare it is. It's just supposed to be a cool thing to put on your shelf, nothing too serious.I used alphanumeric displays so I could represent large values with letters. For example, I could display 5,000 as 5K.
Project: Turn on a computer with an RF remote control - Page 1
Forum section: electronics / projects

author: fubar.gr
author_rank: Unknown
timestamp: November 24, 2014, 12:23:50 pm
content: I had this remote control module (basically a garage door opener) lying around so I decided to put it into useThis module has two relays and each of them is controlled by the corresponding button on the remote control.I wired the relays in series, so both buttons on the remote have to be pressed simultaneously to turn the computer on.I also had to make a little boost converter, because the module runs on 12V and I wanted to power it from the motherboard's 5VSB supply.For more info see the article here:http://fubar.gr/remote-controlled-computer-power-on-eng/The Youtube video has English captions available.
Project: USB to Serial Converter Survey/Evaluation/FunStuff - Page 1
Forum section: electronics / projects

author: mtoecker
author_rank: Newbie
timestamp: October 06, 2014, 09:14:16 pm
content: Howdy Folks,I wanted to introduce a project I'm working on to evaluate USB to Serial converter chips, chipsets, and final products to see if it's possible to write to the firmware on the chip itself. I'm hoping the exercise will be interesting, and possibly helpful in doing interesting things with the USB-Serial chips.I've done some preliminary research already, and have identified the following chips used in converters so far. Has anyone else heard/seen any others used in USB to serial converters?FTDI ChipsFT232HFT232RFT232BFT8U232AMProlific ChipsPL2303SAPL2303TAPL2303TBPL2303HXDPL2303EAPL2303RAPL2305Texas InstrumentsTUSB3410Silicon LabsCP2101MicroChipMCP2200The second phase of this project is to snag as many of these converters as possible, and determine if the firmware on the devices can be changed to allow more features or capability that wasn't originally intended. Part of this is curiosity, the other part is related to computer security issues.Any help would be very appreciated!Mike
Project with BCT8245? - Page 1
Forum section: electronics / projects

author: RoGeorge
author_rank: Super Contributor
timestamp: February 05, 2023, 12:42:02 pm
content: Found one SN74BCT8245A in the scrap boxes.https://www.ti.com/lit/ds/symlink/sn54bct8245a.pdfIt's like a 245 TTL (3-state bidirectional octal buffer), just that it's CMOS, with 24 pins DIL and with a JTAG interface. Has some less common features for a buffer: can sample the buffered data, can generate a pseudo-random pattern, detect shorted together pinsand other features useful for JTAG automated self-test and alike.The chip was sitting in the boxes since the '90s and most probably I won't need such JTAG features any time soon.Any idea what project to do with a SN74BCT8245 for the fun of it?

author: Benta
author_rank: Super Contributor
timestamp: February 05, 2023, 10:24:25 pm
content: Quote from: RoGeorge on February 05, 2023, 12:42:02 pmUse it to make a tie pin? Could look cool.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 07, 2023, 10:08:35 pm
content: I know somebody who drilled an FPGA and attached it to his key-chain.It was a big and expensive FPGA, the coolest key-chain I've ever seen!Since I don't like to wear a tie, I'll just power that 74BCT8245 and play with its JTAG pins out of curiosity.After all, JTAG devices can do a boundary scan while controlled by only 4 pins (TDI, TDO, TMS, TCK), so this BCT8245 can make a nice 16 pins extension for a microcontroller with too few pins, either as DI, or as DO with 50mA sink or source, as long as high speed is not a must. Can even toggle a single pin, and while it's only a 245-like buffer, when in JTAG mode it has a register to shift the bits, so it can memorize the state of each bit.
Project with buried heaters - Page 1
Forum section: electronics / projects

author: Alex
author_rank: Regular Contributor
timestamp: October 23, 2013, 01:49:08 pm
content: Hello all,I've inherited 10+1x buried heating elements, so called 'fire rods' (not the flame sensors). They are rated 750W 230VAC each. 8.5x1.3 cm. They appear to be custom made, but I believe the max temp is around 700-800 degC.What would make a useful project for a number of these?Due to lack of better ideas I am leaning towards a large area heating plate - A number of these mounted under an aluminium plate and a buried thermocouple tied to a PID controller.The 11th one might make an overkill coffee mug heater or chocolate melter.Alex.

author: Balaur
author_rank: Unknown
timestamp: October 23, 2013, 02:00:00 pm
content: Quote from: Alex on October 23, 2013, 01:49:08 pmYou can always build an electricSamovar.Although you should always be careful of samovars.Who knowswhat's inside them!

author: Zero999
author_rank: Super Contributor
timestamp: October 23, 2013, 04:15:07 pm
content: An etch tank.

author: Alex
author_rank: Regular Contributor
timestamp: October 23, 2013, 04:21:33 pm
content: Quote from: Balaur on October 23, 2013, 02:00:00 pmSurely a proper Samovar uses charcoal.Quote from: Hero999 on October 23, 2013, 04:15:07 pmGood idea.

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: October 23, 2013, 04:55:36 pm
content: Quote from: Balaur on October 23, 2013, 02:00:00 pmThat story about bugged Samovar is pretty amusing - why isn't anyone bother to xray damn thing?

author: SeanB
author_rank: Super Contributor
timestamp: October 23, 2013, 07:25:27 pm
content: Not that uncommon, they are used as heater elements in extrusion moulders and other plastic injection moulding and forming equipment as a heat source, and to make heating plates. They are typically enclosed fully in a block though, not attached to the surface in a hole only slightly bigger than the element so that they are a firm slide fit but are not loose. Typically you run them up to 300c in the block.
Project workflows - Page 1
Forum section: electronics / projects

author: Gibson486
author_rank: Frequent Contributor
timestamp: September 03, 2019, 07:58:23 pm
content: Not sure if this is the correct forum, but does anyone have know where i can find example design/ERP workflow diagrams for CAD? I remember seeing these a lot years ago, but they seemed to have gone bye bye when i search for them now.

author: DaJMasta
author_rank: Super Contributor
timestamp: September 03, 2019, 08:11:15 pm
content: Not exactly sure what you're after... but workflow is going to be somewhat different between different software packages, and especially if you're talking all the way to manufacture, it's going to be very different along the chain with the software and hardware used and whether or not it goes through other people (like gerber review at a PCB fab vs. doing it yourself). If you want a specific answer from the general public (forum users) you're going to at least need to specify some core software and what exactly you're trying to do (milling, part fabrication, pcb fabrication, pcb assembly, etc.).If you want workflow within a given CAD package, a lot of the modern ones have pretty good video tutorials which usually outline the steps or at least present them in a way that logically makes sense for the task they're demonstrating, could be a starting point.

author: Gibson486
author_rank: Frequent Contributor
timestamp: September 03, 2019, 08:16:48 pm
content: Just looking for a flow chart that dictates how the design process goes all the way up to gerber/OBD++ generation in terms of files for design and files for production. It is more in terms of how you store files and when it is appropriate to edit them and up-rev them. I am more interested in seeing how the set up the flow chart itself. I know all organizations do it differently...but i am just looking for eye candy that looks nice at the moment.
Projects for isolation transformers, ideas???? - Page 1
Forum section: electronics / projects

author: Mr J
author_rank: Regular Contributor
timestamp: December 21, 2015, 05:23:00 pm
content: Hi allJust scored a half dozen 1200W isolation transformers brand new in box for zero dollars. What would be a good project for these, any ideas?Model ISB-120C

author: Fungus
author_rank: Super Contributor
timestamp: December 21, 2015, 05:47:37 pm
content: I know a guy who did an experiment to see if he could ship things via the post office.I'm not sure he tried Spain though. Maybe you could make a list of foreign countries and try to ship one to each of them. I don't mind letting you use my address for this.
Projects suggestion to use web-hosting - Page 1
Forum section: electronics / projects

author: yashrk
author_rank: Frequent Contributor
timestamp: September 10, 2019, 05:31:15 am
content: Hey everyone,I have bought a new domain name and website for my personal blog and I was just thinking is there any electronics project I can do using my new web server, please suggest any projects if you have in mind.Also, I was thinking to make an IOT project to track my weight, similar to what thingspeak does but I have no idea how to go about doing such a project on a personal server. Any information or suggestion regarding the same will be appreciated.Regards,Yash
Propagation Delay  - Page 1
Forum section: electronics / projects

author: Creedonics
author_rank: Newbie
timestamp: May 29, 2023, 09:23:08 am
content: Hello Everyone,So i'm working on a fairly large and difficult PCB Design using KiCad and i'm in need of matching the propagation delay of my ULPI signals, however i can not find such tool in KiCad, do you know of any plugin that allows me to do so ? or any formula ? or a program that does that for me ?thank you all!

author: ataradov
author_rank: Super Contributor
timestamp: May 29, 2023, 04:02:07 pm
content: Your ULPI PHY should be as close as possible to the ULPI link. If you need to place link+PHY away from the connector, then it is better to make USB signals longer than ULPI signals.And after that matching the length approximately by eye should be sufficient for practical applications.There are no tools for that in KiCad itself, but there are various plugins for this. But you will spend more time trying to figure them out than just routing it by hand.
Propeller clock as a school project - Page 1
Forum section: electronics / projects

author: kubikzovocia
author_rank: Newbie
timestamp: October 18, 2012, 09:31:03 pm
content: Hi, i have chosen propeller clock as a school project and i could use some help from more experienced people, that I'm sure i will find herefor starters the project is few internet sources connected to something i think i like the most, but I'm open to new ideas. the motor is chosen to be 12cm 12V fan(idea byhttp://hawelson.blog.cz/0705/virtualni-tocici-se-hodiny-propeller-clock) and from same design i like the idea of air core transformer for power to the rotating boardas for my part of this project i decided to base the "power supply" on the tiny 13 on which I'm using timers to generate1x +-37,5kHz PWM for speed control of fan1x +-37,5kHz PWM with duty cycle set to 50% just as square wave generator for IR led(I'm using integrated receiver)and 1x software based +-120kHz 50% duty cycle square wave for air core transformer(the value is just randomly chosen by me with "higher f=better efficiency" in mind)now there is button and led on board used for switching and signalling 3 modes just in case i could use themSchematics:OK so i have built this on the breadboard checked on cheap Chinese logic analyzer. all looked fine but when i put signals in transistor(on breadboard i used irlz24n), the output waveform Had huge spikes on rising edgescope outputshttp://imageshack.us/g/1/9819740/first two are outputs on mcu pins(5V)then there are mix of resistive load and tiny fan attached(i see no or very little difference) and last one is big 20W fan attachedthis is the point I'm stuck on because i have no idea why is the ringing there and how to get rid of it. on the final board there will be different transistors(haven't arrived yet) but I'm not sure if transistor could be the problem. i was thinking of using 13V zener to cut "excess voltage" but haven't tried it yet.so this is my little school project if anyone can help me with spikes or have any other ideas advices or just something in mind please say it so i can one day be at least as good as DaveThanks

author: Simon
author_rank: Unknown
timestamp: October 19, 2012, 06:35:34 am
content: that schematic is awful. I know labels are a good way to simplify the diagram and I use them but jesus christ any more and you'd have every single component on it's own with labels. why the power in block ? join it to the reg, why separate the filter caps ?

author: kubikzovocia
author_rank: Newbie
timestamp: October 21, 2012, 06:53:24 pm
content: Simon: OK thanks i have merged that three "blocks" if you have any other advices please keep on. i suppose you don't have any advice regarding mosfet driving?
Proper oscilloscope specs for SMPS design - Page 1
Forum section: electronics / projects

author: codonum
author_rank: Newbie
timestamp: June 23, 2020, 01:10:58 am
content: I plan to buy an oscilloscope for use in my power electronics MBA course. I will use it mainly to design SMPS's, not professionally for now, but with professional quality.If I were to choose between 12-bit resolution 20 MHz bandwidth and 8-bit 100 MHz, which one would be more appropriate for this application?Is 8-bit resolution enough to clearly see mains filtering ripple?Is 20 MHz bandwidth enough to detect most problems in a switcher operating in the kHz range?

author: james_s
author_rank: Super Contributor
timestamp: June 23, 2020, 05:15:11 am
content: I would definitely go with at least 100MHz, there's rarely a reason to look at anything less anymore, unless it's one of the scopes that can be hacked to 100MHz. 8 bits of resolution is pretty standard, I've done plenty of power supply work with mine and never found it to be limiting. You'll probably want at least one HV differential probe too assuming these are off-line power supplies you plan on developing.

author: capacitor_explosion
author_rank: Contributor
timestamp: June 23, 2020, 06:09:55 am
content: If it was only power supplies i would search for one with the smallest Vertical setting aka less than 10mV per devision . 4 channels , and a (HV)differential probe . Also it will be a good idea to buy a Power supply with galvanic isolated outputs (and by PS i mean beefy transformer 1:1 ) .

author: tggzzz
author_rank: Super Contributor
timestamp: June 23, 2020, 06:59:46 am
content: The answer may be different for a DC-DC SMPS (e.g. 12V->5V) or an off-line SMPS (e.g. 240V->5V) or an inverting SMPS or a high-power SMPS.However, the scopewillbe less important than type of probe and whether you use the probes safely (i.e. in a way that does not endanger you, your scope, the SMPS).FFI on probes, read learn and understand the safety/praxis references here:https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/

author: tautech
author_rank: Super Contributor
timestamp: June 23, 2020, 07:58:41 am
content: Quote from: codonum on June 23, 2020, 01:10:58 amBit tricky without an indication of budget but if this was to be for later pro use certainly a scope with a Power Analysis option that has all the tools to properly characterize SMPS parameters would be worth considering.Good sensitivity and reasonable FFT might also be useful for basic examination of EMI however a spectrum analyser is the correct tool for that job.The SDS2000X Plus series of DSO's could be an affordable solution for immediate and future needs.
Proper thermal derating of parts - Page 1
Forum section: electronics / projects

author: Pack34
author_rank: Frequent Contributor
timestamp: June 26, 2019, 03:38:40 pm
content: I have a part that has a max operating temperature of 70C (158F). The maximum board temp is about 45C (114F) with the part itself ringing in at a max of 40C (104F). I don't see the part getting any hotter in a standard use-case. I had to really smother the PCA and enclosure to get it that hot.Is 20C typically a good minimum buffer for operating temp? In the past I've always overkilled the rating to a preferred 125C and a minimum 85C.

author: bob91343
author_rank: Super Contributor
timestamp: June 26, 2019, 04:30:12 pm
content: Theoretically, you don't need a buffer. If the hot spot temperature is below the maximum in the data sheet, you are okay.Practicaally speaking, one tends to leave some room for error or abuse. That margin is up to the designer and there is no hard and fast rule. And in fact, the maximum temperature isn't hard and fast either, and occasional excursions above it will only result in a statistical reduction in life span.If you want long life, leave a bigger buffer. At the molecular level, there is migration which will eventually cause a significant shift in characteristics. If there is a buffer there as well, life will not be compromised.Even a 120 Volt incandescent light bulb when operated at 100 Volts will eventually fail. Minute impurities in manufacture may progress into major faults. These failures have been documented very well and there is no escaping the eventual catastrophe.So the answer to your question is, make your design as conservative as you feel is necessary to insure a reasonable life expectancy. I know that isn't what you are asking but there is no definitive answer.I have equipment that is nearly a century old and still works within specifications. And I have fairly new stuff that has failed. Looking at the design of these units one cannot pinpoint a reason for this.
Proper use of linear regulator VIOC pin - Page 1
Forum section: electronics / projects

author: jan.didden
author_rank: Newbie
timestamp: March 12, 2021, 09:20:21 am
content: First thread here, so please be gently ;-).I want to use the VIOC pin on regulators like the LT3094 (negative output) to drive the switching regulator output that supplies it.The idea is that the VIOC pin represents the input-output voltage difference on the linear regulator, and by driving the switcher with that, the switcher will follow the setting of the linear regulator with a constant input-output differential.In this way, when you change the output voltage of the linear reg, the output of the switcher tracks it.I thought I got it: the switcher I use (LT8582) needs 83.3uA nominal into the neg. FB pin to set the output. So, if I want to have 1V input-output difference on the LT3094, I connect the VIOC (at nominal 1V) through a 12k resistor to the switcher's neg FB input. 83.3uA will flow and all will be well.Not so however, the neg output of the LT8582 will continue to rise until the LT3094 shuts down due to overvoltage.Anybody here has experience with this functionality?https://www.analog.com/media/en/technical-documentation/data-sheets/8582f.pdfhttps://www.analog.com/media/en/technical-documentation/data-sheets/LT3094.pdf, see fig 7Jan Didden
proper use of MC33161to monitor +12V -12V - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: October 23, 2024, 03:11:15 pm
content: Hello Sergey,I have here a component called MC33161.I have only the bad +12V and -12V as inputs from my power supply, 3 second till it reache -12V and 2 seconds till it reaches +12VI learned that MC33161 could to use to monitor these voltage, however i have few questions:What do i put VCC pin?How do i set it to monitor +12V -12V ?Thanks.https://www.onsemi.com/products/power-management/voltage-references-supervisors/voltage-supervisors/mc33161#technical-documentationhttps://www.mouser.com/datasheet/2/308/1/MC34161_D-2315674.pdf

author: eutectique
author_rank: Frequent Contributor
timestamp: October 23, 2024, 04:37:08 pm
content: Quote from: john23 on October 23, 2024, 03:11:15 pmI am not Sergey, but anyway,Let Me Google That For You™1. Clickhere.2. In the document that will open, search for Vcc (press keyboard buttonscontrolandFat the same time, then enter the text vcc). Press the keyboard button F3 to find the next occurrence of the search term vcc.3. Now scroll to page 7.4. In the bottom of the page 7 you will find sectionAPPLICATIONS, pages 7 to 12. Read this section carefully.5. In applications on pages 7 to 12, find a use case that satisfies your requirements.6. Implement it.

author: john23
author_rank: Frequent Contributor
timestamp: October 23, 2024, 07:38:55 pm
content: Hello eutectique, All the applications uses Vcc extrac stable voltage supply.I only have the slow rising +12V -12V.What should i do with Vcc?Thanks.
Proper values for varistor and surge arrester connected in series - Page 1
Forum section: electronics / projects

author: prasimix
author_rank: Unknown
timestamp: March 29, 2016, 06:32:51 am
content: I have a doubt about proper values of MOV and SAR when they are connected in series as suggested in Epcos app notes (Fig. 12). For the 230 VAC mains they recommends SAR of 470 or 600 V, but MOV specification is missing. In my current design I'm using 275 VAC MOVs that doesn't makes any problem but possibly also cannot protect the circuit in a proper way. It seems that MOVs voltage has to be cut in half (e.g. 140 VAC) to start protecting when input voltage goes 20% beyond nominal value. There is many guides how to select proper single MOV but without mentioning such connection in series. Any suggestion? Also why SAR could be 470 or 600 V in this configuration?Thanks.
properly using HMC8193 I/Q mixer allowed power levels - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: September 27, 2024, 02:34:42 pm
content: Hello,I have the HMC8193 component shown in the data sheet below .I know the maximal rating where the component could burn.Where can I see the normal power levels where this device is designed to work at?not being compressed.I am doing upconversion from IF to RF.From the attached table below I know that my LO needs to be 18dBm , How do i know what IF1,IF2,RF needs to be ?Thanks.https://www.analog.com/media/en/technical-documentation/data-sheets/hmc8193.pdf

author: eutectique
author_rank: Frequent Contributor
timestamp: September 27, 2024, 03:57:30 pm
content: Scroll the data sheet down to page 30.

author: john23
author_rank: Frequent Contributor
timestamp: September 27, 2024, 06:44:53 pm
content: Hello, I took the table bellow from page 30.suppose i have one tone in IF which is upconverted to RF.LO=18dBm.Given the table how do I know what is the IF1 IF2 RF power levels in such case?Thanks.
Proportional valve control with NPN transistor (TIP 120) using PWM - Page 1
Forum section: electronics / projects

author: tapasxplore
author_rank: Contributor
timestamp: June 03, 2020, 07:53:22 pm
content: We are working to control the proportional solenoid valve, by changing the voltage across it. For this we are using PWM from the controller, thus changing the average current across the valve.The controller (i.MX RT1060 from NXP) is capable to give up-to +3.3V. We are using TIP 122 NPN Darlington transistor to switch the voltage to 9V. Whenever we are changing the duty cycle from 95% to 100%, then only the valve is getting ON. If we are giving duty cycle is below 90% the valve is completely OFF.We are giving 5KHZ PWM frequency, with 16 bit PWM resolution. The experiment result is mentioned below. Have a look at the sudden increase in the voltage (table attached) from the duty cycle 95% onward. We are getting controller flow, in between 95% to 99% only. If the circuit should work, if should work for the whole range.Initially we have used base resistor of 390 ohm. We thought at lower duty cycle the voltage from the controller to the base of the transistor should be less. We decreased the resistor value from 390 to 190 and then to 47 ohm. Still did not get significant change across solenoid voltage at lower duty cycle. The flow vs duty cycle graph is not matching the datasheet.

author: mikerj
author_rank: Super Contributor
timestamp: June 03, 2020, 11:40:14 pm
content: Where is your freewheel diode? Have you checked what voltage you are getting on the TIP122 collector when it switches off (with a scope, not a multimeter)? A TIP122 is only rated to 100v, so there is a good chance you are exceeding that unless there is something built into the solenoid to clamp this.

author: tapasxplore
author_rank: Contributor
timestamp: June 13, 2020, 07:51:14 am
content: Thanks, with the diode connected it is working fine.
Pros and cons of using higher bandwidth probe on lower bandwidth oscilloscope - Page 1
Forum section: electronics / projects

author: suryaputhra
author_rank: Regular Contributor
timestamp: December 13, 2017, 07:33:00 am
content: What could be the pros and cons of using higher bandwidth probe on lower bandwidth oscilloscope. For example using 300mhz or 500mhz probe on 250mhz oscilloscope.

author: tautech
author_rank: Super Contributor
timestamp: December 13, 2017, 08:58:21 am
content: Only the range of probe compensation adjustment matters.

author: suryaputhra
author_rank: Regular Contributor
timestamp: December 13, 2017, 09:17:33 am
content: Quote from: tautech on December 13, 2017, 08:58:21 amPls explain in detail, no short answer please.

author: JPortici
author_rank: Super Contributor
timestamp: December 13, 2017, 09:33:03 am
content: Probe capacitance is value plus or minus the compensation.. like 12pF +/- 5 pfusing a probe like this with an oscilloscope that has 1 MOhm // 15 pF would be ok, because 15 pF is inside the compensation range.using a probe like this with an oscilloscope that has 1 MOhm // 20 pf would not be ok.

author: tggzzz
author_rank: Super Contributor
timestamp: December 13, 2017, 09:35:34 am
content: Quote from: suryaputhra on December 13, 2017, 09:17:33 amStarthereandhere.

author: tautech
author_rank: Super Contributor
timestamp: December 13, 2017, 09:49:35 am
content: Quote from: suryaputhra on December 13, 2017, 09:17:33 amLook at the sheet that comes with the probe.It has all sorts of specs for the probe but the compensation adjustment range listed in pF must cover the input capacitance spec of the scope it's to used with.EgScope inputs = 15 pFProbe compensation range = 10-30 pFResult = good match.

author: David Hess
author_rank: Super Contributor
timestamp: December 13, 2017, 05:04:50 pm
content: Besides the compensation range issue, if a 300 to 500 MHz probe was used on a 100 MHz oscilloscope then there would be no problem. But at 250 MHz and greater, it is remotely possible that the high frequency transient response would be incorrect because some higher bandwidth high impedance oscilloscope inputs depend on correction from the probe's high frequency transient response for good performance. This is why you sometimes find specific high bandwidth probes recommended for specific oscilloscopes but not others.Some high bandwidth probes include user accessible high frequency transient response adjustments so with a suitable signal source and coaxial probe tip adapter, they can be adjusted to match the oscilloscope. These adjustments are separate from the compensation adjustment.It is not something I would worry about. Most users are not involved in applications where it will matter and lack the test equipment to calibrate the high frequency transient response of the oscilloscope and probe anyway.

author: suryaputhra
author_rank: Regular Contributor
timestamp: December 13, 2017, 05:12:19 pm
content: Quote from: David Hess on December 13, 2017, 05:04:50 pmVery good valid information sir.