hybridfree/eevblog-posts huggingface dataset:
RTL8722DM is now supporting TensorFlow Lite and AI Computation - Page 1
Forum section: electronics / projects

author: dakamaster
author_rank: Newbie
timestamp: June 16, 2021, 09:03:35 am
content: [RTL8722CSM/RTL8722DM] TensorFlow Lite - Hello WorldIntroduction to Google TensorFlowTensorFlow (TF) is an end-to-end open-source platform for machine learning. It has a comprehensive, flexible ecosystem of tools, libraries, and community resources that lets researchers push the state-of-the-art in ML, and developers easily build and deploy ML-powered applications.While TensorFlow Lite (TFL) for Microcontrollers is designed to run machine learning models on microcontrollers and other devices with only a few kilobytes of memory. The core runtime just fits in 16 KB on an Arm Cortex M3 and can run many basic models. It doesn't require operating system support, any standard C or C++ libraries, or dynamic memory allocation.Ameba and TensorFlow Lite TFLAmeba is an easy-to-program platform for developing all kinds of IoT applications. AmebaD is equipped with various peripheral interfaces, including WiFi, GPIO INT, I2C, UART, SPI, PWM, ADC. Through these interfaces, AmebaD can connect with electronic components such as LED, switches, manometer, hygrometer, PM2.5 dust sensors, …etc.Hello World Example Running on Ameba RTL8722DMThe materials we are going to prepare only requires:- 1 x Ameba D RTL8722DM or RTL8722DM-mini, and- 1 x LED.Example GuideDownload the Ameba customized version of TensorFlow Lite for Microcontrollers library at ambiot/ambd_arduino.Follow the instructions at Arduino - Libraries to install it.Ensure that the patch files found at ambiot/ambd_arduino are also installed.Open the example, “Files” -> “Examples” -> “TensorFlowLite_Ameba” -> “hello_world”.Upload the code and press the reset button on Ameba once the upload is finished.Connect the LED to digital pin 10 and ground, ensuring that the polarity is correct. You should see the LED fade in and out rapidly.In the Arduino serial plotter, you can see the output value of the Tensorflow model plotted as a graph, it should resemble a sine wave.ReferencesYou can train your model with google collab by following this weblink:Google ColaboratoryCode ReferenceMore information on TensorFlow Lite for Microcontrollers can be found at TensorFlow Lite for Microcontrollers
RTN current not specified yet large copper on reccomended layout - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: January 16, 2025, 03:28:06 am
content: Hi,for this e-fuse (link below) there is a recommended layout with large RTN copper areas both on top and bottom layers but on the datasheet there is no RTN pin current specified.On one side, I think the RTN might be next to nothing (i.e. mA or even uA) because all the current really goes through the IN and OUT pins. Is that correct?If that is correct, then why such large copper areas AND on multiple planes?Thank youhttps://www.ti.com/lit/ds/symlink/tps2660.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1736968572280&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Ftps2660

author: bdeianov
author_rank: Contributor
timestamp: January 17, 2025, 11:07:56 am
content: It is for thermal dissipation, particularly during an overcurrent event with active current limiting.

author: ricko_uk
author_rank: Super Contributor
timestamp: January 18, 2025, 02:08:04 am
content: Duh... I can't believe I asked that question... in front of the PC literally 16-18 hours per day... I think I really need to take a break...Thank you for answering such an obvious one...

author: bdeianov
author_rank: Contributor
timestamp: January 18, 2025, 02:49:16 am
content: Heh. I happened to be doing a layout with this device just yesterday, so I had the answer front of mind. In my case, I'm not using active current limiting, so I concluded the large RTN pours are not that important.

author: ricko_uk
author_rank: Super Contributor
timestamp: January 31, 2025, 12:57:32 am
content: Thank you again @bdeianovI decided to use it as Latch-off fuse. Given that you mentioned you just used that very IC, do you see anything that should be corrected in the attached configuration?Thank you

author: bdeianov
author_rank: Contributor
timestamp: February 01, 2025, 12:26:22 am
content: Looks reasonable to me (I'm not an expert by any stretch). What is the application and requirements?What indicator LEDs are you using? If 2V2 means Vf = 2.2 V, that seems high for a red LED, and I expect at least R75 needs adjustment.

author: ricko_uk
author_rank: Super Contributor
timestamp: February 02, 2025, 11:27:48 pm
content: Thank you @bdeianovyes it was originally connected to Vbus so the LED can be turned on even if the fuse is in latch-off mode (I already corrected that).Thank you
Rude and crude "e-field probe" - Page 1
Forum section: electronics / projects

author: palindrom
author_rank: Newbie
timestamp: June 16, 2018, 07:00:02 pm
content: Hi!I just made that monstrosity, but it works, so maybe it's not so stupidWhat do you need:- Oscilloscope- 50 ohm feed-through BNC terminator (if you don't have it on scope, which you don't if you're considering making my "probe")- RP-SMA and BNC connectors, crimp tool- 50 ohm RF cable, RG-58 will do- Cheap standard RP-SMA WiFi antenna. I found mine on the sidewalk, still in blister. This is why I did what I did hereI successfully observed switching noise and a couple of transmitters around.It's not selective, nor directional. But hey, it's almost for free.Note: probe multiplier should be set to 2x, not 0.5x as in picturewhich would be relevant only for rated antena frequency and if you know gain exactly.
Rudolph the Red Nosed Reindeer - Page 1
Forum section: electronics / projects

author: bitluni
author_rank: Contributor
timestamp: December 24, 2013, 04:54:03 am
content: It might be too late to inspire you to build some funny x-mas themed ornaments.. but you might appreciate it anyways:http://youtu.be/MsJR5nU6oWEI wish you merry Christmas...Btw... if you take a look at the first 5min of the vid.. there might be some flaws on the operation of the n-MOSFET gate. I just tried to explain it as easy as possible. Please point any errors here out... I might need attach some corrections to the vidThanks in advance.

author: SeanB
author_rank: Super Contributor
timestamp: December 24, 2013, 12:31:56 pm
content: Very nice there.

author: hgg
author_rank: Frequent Contributor
timestamp: December 24, 2013, 01:01:13 pm
content: Cool!

author: GreyWoolfe
author_rank: Unknown
timestamp: December 24, 2013, 07:12:50 pm
content: 2 thumbs up!!

author: dissidence
author_rank: Newbie
timestamp: December 28, 2013, 02:52:10 am
content: mine never start on the tracks in the first place.Quote from: GreyWoolfe on December 24, 2013, 07:12:50 pm
Rugged RJ45 connector brands - Page 1
Forum section: electronics / projects

author: boumboauto
author_rank: Contributor
timestamp: March 22, 2021, 08:45:57 am
content: Hello,I just stumbled upon a really interesting white paper about RJ45 connectors and tests made to different brands of connectors in order to select which are the best.The article can be found therehttps://www.eurocircuits.com/blog/white-paper-reliability-comparison-of-rj45-and-mini-io/It ranks the Mini I/O as the best connector, however RJ45 are labelised as Brand A, B, C, D .... II wanted to know if any of you could help us figure out which brands are what. Obviously the brand I seems to have the best performance. If anyone has information about that I think it would benefits many people here designing stuff with RJ45 connectors in industrial environments (obviously there are better connectors out there but sometimes we are stuck)

author: jonpaul
author_rank: Super Contributor
timestamp: March 22, 2021, 12:50:29 pm
content: Neutrik and Switchcraft make fine RJ-45 units.Jon

author: boumboauto
author_rank: Contributor
timestamp: March 22, 2021, 02:06:56 pm
content: Thanks, these references look like the quality we are looking for.

author: ajb
author_rank: Super Contributor
timestamp: March 22, 2021, 09:06:47 pm
content: The Neutrik EtherCON connectors use standard 8P8C piercing plugs internally, so the benefits are really mechanical, with the outer shell providing protection and a more secure locking arrangement than a standard 8P8C plug on its own (plus somewhat better shielding because of the continuous metal shell). Therefore the electrical performance, including electrical reliability will primarily depend on the quality of the 8P8C connector used and how well it's applied to the cable, although the shell does provide better support that likely reduces or eliminates motion at the contact interface versus a naked 8P8C. The IP65 variants (TOP series) of course offer improved environmental protection as well, but you have a much more limited selection of jacks in that family. They're good connectors, though.The Bulgin Buccaneer series is another option where the jacks accept a standard 8P8C plug, but not sure that it or even the EtherCON series are in scope of that white paper based on how they describe the connectors. It sort of sounds to me like they were testing more conventional connector designs.If you don't need compatibility, there are specific key coded M12 variants for 10/100 (D code) and gig (X code).

author: bson
author_rank: Unknown
timestamp: March 24, 2021, 03:45:43 pm
content: When picking an equivalent, make sure it includes the magnetics (for example, Amphenol MagJack) if it's supposed to, has the correct impedance, and has the correct LED A/K pins.
Ruggedized box-Anyone know of any available? - Page 1
Forum section: electronics / projects

author: djsb
author_rank: Super Contributor
timestamp: May 26, 2010, 03:47:34 pm
content: Hi,I'm looking for a ruggedized box/case just a bit bigger than a 128 x 64 Graphics LCD (plus room for a few switches). The box will need a cutout for the LCD and some kind of protection for the screen. Anyone know of any manufacturers doing this kind of thing? Just exploring ideas at the moment. What kind of plastic is used in the Fluke multimeter cases as this would be strong enough. The box and it's contents would be used in an automotive/garage environment and needs to be tough.Thanks,David.

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 26, 2010, 03:59:06 pm
content: https://www.eevblog.com/forum/index.php?topic=592.0

author: redek
author_rank: Contributor
timestamp: May 27, 2010, 12:35:24 am
content: Pelican makes some great cases that can take a beating. I'd try one of these Micro cases. The top is clear, so the lcd could be well protected. The cases are not designed as a project box but should work well.http://www.pelican.com/case_category.php?CaseSize=Micro%20Case%&New=%

author: saturation
author_rank: Super Contributor
timestamp: May 27, 2010, 02:55:09 am
content: Pelican's and more with good prices:http://www.4lessdepot.com/pelican_cases.html
Ruggeduino Output Rails Protection Doesn't Make Sense To Me - Page 1
Forum section: electronics / projects

author: yrrapt
author_rank: Contributor
timestamp: September 23, 2013, 10:03:21 pm
content: Hi,I've been looking at the Ruggeduino board (http://ruggedcircuits.com/html/ruggeduino.html) for some inspiration for circuit protection in one of my projects. What interests me in particular is the output protection to stop applied voltages raising the rails and blowing other components connected to those rails.They show the circuit they use but as far as I can understand it the P-type MOSFET is connected backwards and supplies power to IO through the diode across the drain and source regardless of gate voltage. When the IO voltage is higher than the regulator voltage the diode blocks any current and the comparator turns the MOSFET off. But then surely just using a Schottky would have sufficed without the extra circuitry.Can someone tell me what I'm missing here?Cheers,Tom

author: Short Circuit
author_rank: Frequent Contributor
timestamp: September 23, 2013, 10:20:30 pm
content: Guess they wanted to elimate the voltage drop that comes with just a diode.btw Too bad their mosfet will be destroyed with any 5VIO transient/spike above 20-25V due to the limited Vgs(max) of the mosfet... So much for rugged

author: dannyf
author_rank: Super Contributor
timestamp: September 23, 2013, 11:36:35 pm
content: QuoteThey are trying to protect against a high transient on the +5VIO line (assuming that it is within Vgs(th) ratings of the mosfet).QuoteBeing rugged doesn't mean it is unfallable.

author: sleemanj
author_rank: Super Contributor
timestamp: September 24, 2013, 12:42:50 am
content: Quote from: yrrapt on September 23, 2013, 10:03:21 pmWatch:

author: dannyf
author_rank: Super Contributor
timestamp: September 24, 2013, 12:56:45 am
content: QuoteThat came from an old IRF application note. N-ch mosfets can be utilized as well.

author: yrrapt
author_rank: Contributor
timestamp: September 24, 2013, 07:48:36 am
content: I was under the impression that the P-channel wouldn't conduct current in this direction. Obviously a bit of a fundamental understanding failure on my part, back to the books!Thanks for the help guys.Tom

author: Harvs
author_rank: Super Contributor
timestamp: September 24, 2013, 09:07:49 am
content: QuoteCommon misconception. A mosfet will have a low impedance in both directions with a Vgs into saturation. That's what makes them good as synchronous rectifiers.
Rule of thumb for keep-out regions for components? - Page 1
Forum section: electronics / projects

author: Pack34
author_rank: Frequent Contributor
timestamp: December 29, 2016, 04:37:45 pm
content: is there a rule of thumb for general keep-out regions for components?I've noticed that in Eagle, simple components like resistors and capacitors will have a keep-out defined at about 6 mils on the long side and about 24-mils on the short sides. Other components like a SOT-23 will have a simple box around the component with about a 6-mil spacing around the actual component.I'm guessing that the default keep-out related to the RCL components is greater on the short sides for soldering, but is there a typical rule-of-thumb that dictates this dimension (such as height) or in general the typical dimension about 6-mil spacing around the component, which seems to be related to the minimum trace-width as per the design rules?

author: KL27x
author_rank: Super Contributor
timestamp: December 30, 2016, 05:47:47 am
content: I think it's more related to accuracy of PnP machine than to do with min trace clearance. If you put the physical parts too close, you could end up with unassemble-able board. The min distance between traces/pads/copper is a separate thing.

author: Dago
author_rank: Frequent Contributor
timestamp: December 30, 2016, 07:28:44 am
content: IPC7351B standard specifies "courtyards" for components which are keepout zones. They used to be just a rectangle around the component on a 0.25 mm grid (I think) but now they are polygons with 90 degree corners.
Run a Rigol off a 12v DC power supply? - Page 1
Forum section: electronics / projects

author: ball
author_rank: Contributor
timestamp: July 03, 2016, 08:16:58 am
content: Hi. I'm usually on the road and was wondering if anyone ran their Rigol off a DC power supply, presumably via a DC-DC converter. I haven't purchased one yet due to this issue and as a result have been considering one of those portable or USB-based samplers (yeah, I know, boo hiss, but they don't require AC!)Inverters, especially pure sine wave, are inefficient and expensive.Thanks

author: cs.dk
author_rank: Unknown
timestamp: July 03, 2016, 08:30:10 am
content: Have a look here;https://www.eevblog.com/forum/testgear/battery-pack-for-rigol-ds1054z/

author: ball
author_rank: Contributor
timestamp: July 03, 2016, 08:41:54 am
content: Maybe an Owon SDS would be easier to hack

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 03, 2016, 03:30:06 pm
content: I modified my Instek 1062A to run on a 3s8p pack made from old laptop batteries. It takes quite a few DC/DC converters to get all the voltages needed. There's a lot of empty room in the case so it wasn't very difficult to fit everything in.

author: Circlotron
author_rank: Super Contributor
timestamp: July 04, 2016, 12:04:32 am
content: I have run my DS2072 of a 12v-240vac 50Hz inverter that gives a rectangular output voltage, then fed it into a bridge rectifier before it reaches the scope. The bridge was so the inverter doesn't see the X caps across the mains inside the scope PSU. So it is effectively running on 340vdc. Does generate a certain amount of nose but I was using it in a high noise environment anyway - probing the electrics of an old bus while we were driving down the road.The point being the scope runs fine on straight 340vdc or whatever corresponds to peak AC voltage in your country.

author: saturation
author_rank: Super Contributor
timestamp: July 07, 2016, 02:35:32 pm
content: Just remember if you run a DSO meant for AC power off an isolated inverter or a battery pack that you are floating the DSO and all the issues that entail.

author: SteveyG
author_rank: Unknown
timestamp: July 08, 2016, 01:20:53 pm
content: Of course line triggering no longer works...

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 11, 2022, 01:43:38 pm
content: head up for myBattery Powered PSU for Portable Rigol DS1000E/Zto thread followers, cheers.
Run DOOM on an NES by embedding a Raspberry Pi in the cartridge - Page 1
Forum section: electronics / projects

author: rasteri
author_rank: Contributor
timestamp: August 29, 2019, 11:52:28 am
content: Hi all, I just released my project -https://github.com/rasteri/PiPUIt's a method of using a Raspberry Pi as a graphics accelerator for the NES. It uses Cypress Semiconductor's FX2LP High-speed USB controller to hijack the NES' graphics memory bus, and inject video data directly into the NES' picture processing unit.In the github there's the graphics translation code, as well as the firmware for the FX2LP and the 6502 code for the NES' CPU.Here's a video going into more detail :

author: Bicurico
author_rank: Super Contributor
timestamp: August 29, 2019, 01:29:08 pm
content: Congratulations!!! Very cool project and nicely done.Also, let me tell you that I am impressed by your comments during the video. Fast but not too fast and very clear and understandable.Just one question. How long did it take you from initial idea to finished project?Regards,Vitor

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 29, 2019, 01:29:25 pm
content: Hah, saw it on YT recommended before seeing it here! Fantastic piece of work!Tim

author: rasteri
author_rank: Contributor
timestamp: August 29, 2019, 09:10:31 pm
content: Thanks for your kind words!Quote from: Bicurico on August 29, 2019, 01:29:08 pmI got the idea about two years ago, but I took a long break in between. It was one of these projects where it was bubbling away in the background for a long time, and eventually I'd made so much progress that abandoning it would be a bigger waste of time than just finishing it, haha.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 29, 2019, 10:47:50 pm
content: Very clever idea, im impressed congrats

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 29, 2019, 10:57:48 pm
content: Quote from: rasteri on August 29, 2019, 11:52:28 amSo is the video data streamed from the RPi through USB?

author: rasteri
author_rank: Contributor
timestamp: August 30, 2019, 12:22:05 am
content: Quote from: SiliconWizard on August 29, 2019, 10:57:48 pmYeah exactly. The USB bus is ideal for this kind of thing as (unlike most of the other RPi buses) it has great library support. The FX2 is flexible enough to emulate memory, if you ignore the address bus.Also it meant I could prototype everything on my Linux desktop PC instead of the Pi.
Running 24V BLDC motor with 7s battery - Page 1
Forum section: electronics / projects

author: fedimakni
author_rank: Regular Contributor
timestamp: June 24, 2025, 03:21:25 pm
content: ello,I am building an ESC for a BLDC motor to use it in a robot.My BLDC motor is a 24V oneMy battery is a 7s so its max voltage will be 29.4V.Is it ok to connect the battery voltage directly to the 3 phase half bridges or i need to use a buck-boost converter to generate a stable 24V?Thanks

author: Martinn
author_rank: Frequent Contributor
timestamp: June 24, 2025, 05:12:55 pm
content: The nameplate voltage of BLDC motors is somewhat arbitrary. Primarily it means that the motor will achieve a certain speed at the given voltage.For example, for 24 V 6000 rpm might be given. The motor will run roughly at 3000 rpm with 12 V or 12000 rpm at 48 V (something might break though mechanically at massive overspeed). This is governed by the motor back EMF constant. A 24 V run at 30 V will be a bit faster (do the math), which is irrelevant as you'll run closed loop position control in a robot anyway.You don't do buck or boost converters with motors, the motor already consists of inductors, no need to add another supply loop.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 24, 2025, 05:26:29 pm
content: As Martinn already mentioned, there is no need to add extra hardware, there is no hard limit on motor voltage. Your motor can also run from an 50V power supply, provided that the motor controller itself can work with this voltage. There are some additional constraints, when you are overvolting the motor it can also take more power from the power supply, and when you do this for a long time, (minutes) the motor will overheat. But it's not the extra volts that kill it, it's the excessive heat.The difference between 24V and 30V is pretty small and this probably ndoe not need any extra sort of protection. If the difference gets bigger, then a method to prevent the motor driver from applying the full input voltage may be an additional precaution. And also keeping an eye on the motor temperature. In industrial applications it's very common to protect motors with extra safety devices such as a PKZ.
Running a 12V AC marked G4 LED on DC? - Page 1
Forum section: electronics / projects

author: OZ1LQO
author_rank: Newbie
timestamp: November 16, 2020, 09:19:04 am
content: Hi - apologies if this has been debated before, this is a huge forumI came across a couple G4 Halogen LED replacements from OSRAM and Philips. The OSRAMs ('Parathom') are clearly marked AC/DC, the Philips however, are marked 12V AC.They probably both have a bridge rectifier, so even the Philips should work on DC, I tested it, and it does just fine.My question here is, if one could imagine that the Philips AC ones may actually not be designed for DC, even though it works?Meaning, running it at DC, will forward bias two of the diodes in the rectifier at full load current, at 100% dutycycle. As for AC they would be reversed biased half the time.Being G4 replacements, designed with a small form factor in mind, the diodes may not be rated for this usage unless the device is specifically designed with this in mind.I have been unable to find any info on this, so any comment would be appreciated. The reason I want to run them on DC is for electrical noise reasons (Hamradio).Cheers

author: madires
author_rank: Super Contributor
timestamp: November 16, 2020, 09:42:24 am
content: The G4 LED shouldn't have much power, maybe 1-2W. No need to worry!

author: OZ1LQO
author_rank: Newbie
timestamp: November 16, 2020, 09:52:19 am
content: Thanks - however, 2W on 12V DC is 166mA continuous in the two forward biased diodes? Even an 1N4148 is rated to 150mA average forward current, with it's absolute max at 300mA ..I'm still in doubt

author: madires
author_rank: Super Contributor
timestamp: November 16, 2020, 10:18:40 am
content: Then take one apart and check which diodes are used.
Running a dc motor amplifier - Page 1
Forum section: electronics / projects

author: embedded.world@aol.com
author_rank: Contributor
timestamp: April 14, 2014, 07:34:33 am
content: I am using a dc motor amplifierhttp://www.newark.com/maxon-motor/230572/dc-motor-amplifier-dec-50-5-5a/dp/15R2893It has option to control motor's direction/brake & other functions only.I am interested in direction & brake.What should be correct algo for reversing the direction of motor. Should I apply brake first & then reverse direction.Is below method correct:while(1){; motor runs for 1 min; Apply brake by pulling line low; wait 2 sec for complete halt; change direction by changing direction pin state;; wait 1 sec more before releasing brake; release brake after which motor will move in opposite direction}
Replacing LCD panel with one that has a higher native resolution - Page 1
Forum section: electronics / projects

author: Phaseseeker
author_rank: Regular Contributor
timestamp: November 29, 2021, 04:02:48 pm
content: I have a vintage Thinkpad with a broken TFT screen and, since a replacement would cost an obscene amount of money for a pretty meh screen, I was thinking about replacing it with a different LCD panel. The cable coming from the motherboard carries standard parallel RGB666 video (R[0..5], G[0..6], B[0..6], Vsync, Hsync), so it should be easy enough to interface to a generic screen (I was thinking about using a TI SN65LVDS93B to convert the signals to LVDS).My problem is that modern screens tend to have higher resolutions than the stock 800x600 and/or the maximum resolution the chipset is capable of (1024x768). Can I just feed an higher resolution panel with the signal from the motherboard and expect it to display the image (of course at the same resolution of the old screen) or it would just not work? I'm thinking it wouldn't but then again I don't get how the stock screen can display lower resolution video (with black bars on the side) when there's no hardware scaler (and the software one can be turned off).
rusEfi: open source standalone engine management system - Page 1
Forum section: electronics / projects

author: russian2
author_rank: Contributor
timestamp: January 05, 2015, 04:36:33 am
content: Hey everyone, I would like to share the project I am involved with:rusEfi is a GPL open source standalone engine management system.I am playing with this for about two years now and it recently got to Beta version. stm32f4 arm chip, ChibiOS for RTOS/HAL, KiCad for PCBs. About a dozen of engines have started with this engine control unit, hopefully in about six months this would debut at a race track.Why another open source EMS? Mostly with the intention to make this one the most user-friendly one and implement more readable code comparing with existing stuff.

author: russian2
author_rank: Contributor
timestamp: June 23, 2016, 01:01:51 am
content: We had our racing debug about a month ago

author: diyaudio
author_rank: Frequent Contributor
timestamp: June 25, 2016, 06:00:59 pm
content: Quote from: russian2 on January 05, 2015, 04:36:33 amwow cool, reminds me of mega squirt.

author: russian2
author_rank: Contributor
timestamp: June 25, 2016, 06:17:43 pm
content: mega squirt is one of the cheapest proprietary systems with a huge following, this one is GPL & OSHW

author: batteksystem
author_rank: Regular Contributor
timestamp: June 26, 2016, 02:31:01 am
content: Why do you need to break the connectors? (Dent on the connector in the photo)

author: russian2
author_rank: Contributor
timestamp: June 26, 2016, 02:56:20 am
content: Quote from: batteksystem on June 26, 2016, 02:31:01 amGood question! Probably I did not want the plugs to lock, probably did not like pulling hard on the harness.

author: KE5FX
author_rank: Super Contributor
timestamp: June 26, 2016, 04:10:10 am
content: Very cool. How about an open-source PDK controller?

author: russian2
author_rank: Contributor
timestamp: January 25, 2017, 10:21:38 pm
content: Quote from: KE5FX on June 26, 2016, 04:10:10 amwhat is PDK in this context?in the meantime this now supports VVT

author: russian2
author_rank: Contributor
timestamp: February 15, 2020, 03:42:54 am
content: We are still playing with all thismicroRusEfi is a smaller nicer looking board with stm32f4 or stm32f7 and TLE8888
russian circuit designations - Page 1
Forum section: electronics / projects

author: pete g
author_rank: Regular Contributor
timestamp: January 29, 2022, 07:17:40 pm
content: hi all, i'am working with a russian schematic. i'am confused by several value designations. the first is for electrolytic caps of 10mk and 47mk and also an inductor 100mkhn? can you tell me what these values are? thanks.

author: ataradov
author_rank: Super Contributor
timestamp: January 29, 2022, 07:36:52 pm
content: 10 uF, 47 uF, 100 uH

author: pete g
author_rank: Regular Contributor
timestamp: January 29, 2022, 07:42:21 pm
content: thanks. what if there is a f after the mk?

author: ataradov
author_rank: Super Contributor
timestamp: January 29, 2022, 07:53:40 pm
content: It would be better to see a picture. You can probably assume that it is for Farad, but it is not standard and typically you don't see a mix like that. As far as I know the only time F is used is for the actual Farad range. Values in the pF range don't have any unit designation. uF range is marked "MK" with no F, and a Farad range is F.

author: pete g
author_rank: Regular Contributor
timestamp: January 29, 2022, 08:28:03 pm
content: thank you, very helpful.
RX clk UART in FPGA - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: December 26, 2013, 09:42:13 am
content: Hi,I have a 150Mhz clk available..... I am trying to implement a 10Mbps UART with configurable baud rates in an FPGA.....I have to generate the following baud rates too ..... 10Mbps, 5Mbps,3Mbps, 1.2mbps, 1mbps ---- normal 115.2kbpsHow to select the receive sample clock??? 16X sampling calls for a high reference clock rate..... How can i receive above baud rates with less than 1% error rate.....working on 10X sampling its easy to generate rx sample clock for the above baud rates....... for 10Mbps (5x) rest 10x.....Is it advisable to work on 10X??Is there any other work around for the above frequencies??..... Please help

author: AndyC_772
author_rank: Super Contributor
timestamp: December 26, 2013, 10:02:55 am
content: Start by carefully working out what the the important figures are that you actually need to achieve. With a UART, what you need to do is ensure your clock is accurate enough so you're sampling at some valid point within each data bit.You don't need to sample each bit many times, and you don't need to sample each bit exactly in the middle. Just ensure that, assuming you synchronise the sample point at the beginning of the start bit, you're still sampling at some point within the valid window by the time of the stop bit.If you work out the worst case clock slip, I suspect you'll find that you don't need 1% accuracy. You can slip nearly half a bit in 10 bits.If it helps, use one of the PLLs in the FPGA to generate some other, more convenient reference clock from the 150 MHz input. You should be able, for example, to get 80 MHz from 150 Mhz using a PLL, and then oversample the incoming data 8 times.

author: zapta
author_rank: Super Contributor
timestamp: December 27, 2013, 04:35:45 pm
content: Changing the UART clock to change the baud rate is one degree of freedom you have with FPGA. A second degree of freedom is to change the counter limits within the UART (does not have to be the same for all baud rates). A third degree of freedom is to have non even bit period, spreading the ratio reminder across bits.You have plenty of control when designing with FPGA.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 27, 2013, 04:48:28 pm
content: You don't need anywhere near 16x clock for a UART. One simple trick is to reset your baudrate divider on the startbit edge to minimise any jitter when using a low ratio of clock to baudrate.Note however that when doing high rates you need to keep a close eye on external sources of jitter etc. For any distance it would need to be differential (RS422/485 or LVDS).Self-clocking codes like manchester may be more suitable at higher rates.
RX Data incorrect on TI CC1101 RF Module - Page 1
Forum section: electronics / projects

author: cheeseburger
author_rank: Contributor
timestamp: December 17, 2024, 06:43:02 pm
content: HelloI use two TI CC1101 RF Modules (Chinese Modules -https://www.aliexpress.com/item/1005003781140201.html). Both modules are connected to a Raspberry Pi 2 SBC via SPI.One of them is doing TX, the other one is doing RX. The TX one is transmitting 8 Bytes every 500ms.This seems to kind of work, but just kind of. When checking the receive Buffer, it it reports received data like this. Sometimes a bit better, sometimes a bit worse:Code:Bytes in FIFO: 8Looks like we have data..Received data: AA 88 AB 22 33 44 44 55Flushing FIFO..Bytes in FIFO: 8Looks like we have data..Received data: AA 88 AB 22 33 33 44 55Flushing FIFO..Bytes in FIFO: 8Looks like we have data..Received data: AA 88 AB 22 33 44 44 55Flushing FIFO..Bytes in FIFO: 8Looks like we have data..Received data: AA 88 AB 22 33 44 44 55Flushing FIFO..The sent Buffer is the following one:Code:uint8_t mydata = {0xAA, 0x88, 0xAB, 0x22, 0x33, 0x44, 0x55, 0x66};So the received Buffer is kind of correct, but just kind of. It changes from time to time a bit (e.g. the third buffer is different than the other ones above). The length is correct, but some Bytes are duplicated.Is this "normal" Performance for CC1101? Or am I doing something horribly wrong?I have attached my Code.

author: cheeseburger
author_rank: Contributor
timestamp: December 18, 2024, 12:47:00 am
content: Fixed it, the issue was created by not synchronizing the read function to the end of the packet.Before reading RXFIFO, it must be assured that the end of the Packet already is reached.This can be accomplished with GDO Pins. I used this Option:Code:Asserts when sync word has been sent / received, and de-asserts at the end of the packet. In RX, the pin will also de-6 (0x06)assert when a packet is discarded due to address or maximum length filtering or when the radio entersRXFIFO_OVERFLOW state. In TX the pin will de-assert if the TX FIFO underflows.
s applied to 3d printing - Page 1
Forum section: electronics / projects

author: noidea2047
author_rank: Newbie
timestamp: July 04, 2018, 09:52:38 pm
content: i believe all thing are Relative . heres a conception of variable vector modulation expressed as molded critteror critters. Reality + in the modulation of molded creaction < set point of degree with the scale your able to conceave, its all relative. close enough/// nozzle sive and numbers etc.../// nuetralize N to allow for C,tolerance or Degree of C >< Observersers setm point within the scale >< relative to what seems visible of the scale..CConstantR////S><C/N.>of VV2......not complete but enough to start ya seeing i know my math. maybe a third of a third can get it

author: JS
author_rank: Frequent Contributor
timestamp: July 05, 2018, 11:14:36 am
content: Is it you figting with the wind mills in the picture?JS

author: tpowell1830
author_rank: Frequent Contributor
timestamp: July 05, 2018, 11:55:42 am
content: Where is Sancho Panza in the picture?
S-PDIF receiver converter/DAC without clock - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: June 10, 2020, 01:29:09 pm
content: Hi,is there such such thing as a S-PDIF receiver that converts the optical signal to analog (i.e. the DAC part) that does not use clock? I am thinking to try to put said receiver inside a Faraday cage where the space needs to be as quiet as possible so definitely no clock/switching sources inside there.Thank you

author: tggzzz
author_rank: Super Contributor
timestamp: June 10, 2020, 01:42:52 pm
content: If you have digital signals, you have switching and switching transients. Those transients may be coupled to other circuits.Roughly speaking, the energy in a transient depends on the transient's transition time and the change in voltage/current. So to minimise transient energy, have a balanced signal and maximise the transition time. The latter is one reason many ADCs/DACs have two outputs, one the inverse of the other.The power in the transients can be measured over many transient periods (e.g. clock cycles), and is proportional to the frequency at which the transients occur. The power may or may not be relevant in your system.Depending on your system, it may be possible to avoid transients during a measurement period and have the transients when no measurements are being made.

author: David Hess
author_rank: Super Contributor
timestamp: June 10, 2020, 06:51:05 pm
content: The S/PDIF receiver phase locks a local clock to the incoming serial bit stream to recover timing for the DAC so you always have a clock.

author: Bassman59
author_rank: Super Contributor
timestamp: June 10, 2020, 07:55:37 pm
content: Quote from: ricko_uk on June 10, 2020, 01:29:09 pmNot if you actually want it to work.
S25FL256 serial Flash Voltage rail sequence - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: October 27, 2019, 05:57:41 am
content: Hi ,I happen to raise a query regarding voltage rail of serial FLASH S25FL256 via this thread in cypress forumhttps://community.cypress.com/thread/45499thread response specified using system 1.8V for pullups input pins.Data sheet:https://www.cypress.com/file/448601/downloadFor S25FL256 VIO volatge can be 1.8V or 3.3V and I want to operate VIO in 1.8V. It also has a sequencing requirement VIO should follow VCC. Since my system voltage rail does not follow this sequence I have used a separate LDO to generate the voltage needed.The Input pin voltages have an absolute max specification of""Input voltage with respect to Ground (VSS):: ( –0.5V to +(VIO + 0.5V)).....My query was which voltage rail I need to pull up input pins to....If the response is correct then how this absolute max rating is surmounted...please help

author: rakeshm55
author_rank: Regular Contributor
timestamp: October 27, 2019, 06:11:34 am
content: Attached is the schematics page

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 27, 2019, 03:08:20 pm
content: Quote from: rakeshm55 on October 27, 2019, 05:57:41 amTo VIO, what else?Quote from: rakeshm55 on October 27, 2019, 05:57:41 amI may have missed something, but how would pulling up to VIO violate the specs?

author: rakeshm55
author_rank: Regular Contributor
timestamp: October 28, 2019, 03:06:17 pm
content: Hi,""signals HOLD, WP and CS to power rail B_1V8_D. ""Is the response I received ...B_1V8_D is system supply voltage and not VIO....VIO is sequenced after VCC where as B_1V8_D is sequenced before VCC.... So for a short period I guess input pins will be raised above VIO... This is my concern

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 28, 2019, 03:24:58 pm
content: They may have gotten confused by your multiple 1.8V rails.As I said, I would personally pull up to VIO, which after looking at your schematic would be B_1V8_SF.

author: voltsandjolts
author_rank: Unknown
timestamp: October 28, 2019, 03:35:12 pm
content: The FLASH IC has internal pullups on Write Protect and Hold signals, presumably to VIO.Leave your pullups unpopulated and relax, it'll be fine.
[solved] S3 Vision 964/968  Datasheet - Page 1
Forum section: electronics / projects

author: madao
author_rank: Frequent Contributor
timestamp: March 09, 2020, 02:28:05 pm
content: Hello People.I am looking about technical paper , speciall pinout, for S3 Vision 964/968bitsaver.org has pdf about this videochip, but only software-side.thanksmatt

author: madao
author_rank: Frequent Contributor
timestamp: March 11, 2020, 03:12:55 pm
content: https://datasheet4u.com/search.php?sWord=86C964
S32S24 bring up - Page 1
Forum section: electronics / projects

author: rounin
author_rank: Regular Contributor
timestamp: May 05, 2020, 04:40:16 am
content: Starting to work on a new chip, NXP S32S247. 8 cores in dual lockstep (4 user cores), 16MB of ram! Lots of IO. They still have the Freescale logo on the chip which is a little funny.Hoping to do a NuttX port "soon". There is a FreeRTOS port, fortunately, to use as reference.First thing out of the box, having issues with JTAG -https://community.nxp.com/thread/528998. I guess embedded is hard enough without using new silicon, one a new JTAG probe, with a new IDE.

author: jmsigler
author_rank: Regular Contributor
timestamp: May 05, 2020, 05:20:14 am
content: Where'd you get this thing out of curiosity? Looked like they were only shipping dev boards to large established customers last I checked.

author: rounin
author_rank: Regular Contributor
timestamp: May 05, 2020, 04:40:03 pm
content: Yup, need a contact at NXP, not very easy to get yet.
S53MV Frequency Counter Project Firmware - Page 1
Forum section: electronics / projects

author: PU1PBE
author_rank: Newbie
timestamp: October 23, 2018, 02:16:54 am
content: I'm very interested in building the S53MV Frequency Counter, but I can't find the PIC firmware.Any help?

author: Dave
author_rank: Super Contributor
timestamp: October 23, 2018, 05:01:44 am
content: http://lea.hamradio.si/~s53mv/counter/operation.htmlBottom of the page.

author: S53SG
author_rank: Newbie
timestamp: October 24, 2018, 08:23:01 am
content: Hi @PU1PBE here you can find some upgrades of S53MV frequency counter (in slovenian language, you'll need some help with google translate =)):http://forum.hamradio.si/viewtopic.php?f=14&t=6267https://s5tech.net/viewtopic.php?f=78&t=666

author: bd139
author_rank: Super Contributor
timestamp: October 24, 2018, 09:02:50 am
content: I looked at building this about a year ago. The parts availability is likely a larger problem than the firmware on this unfortunately.

author: HB9EVI
author_rank: Frequent Contributor
timestamp: October 24, 2018, 03:11:48 pm
content: at least the prescaler could be replaced by a MB506
S7 sensor electrode connector - Page 1
Forum section: electronics / projects

author: poorchava
author_rank: Super Contributor
timestamp: January 09, 2015, 12:57:53 am
content: Hey, I'm doing a project involving some obscure electrochemical sensor cells, and some of them come with a so called S7 connector. The annoying part is that I need the amplifier circuitry to sit directly on the sensor cell (or as close as possible) and those S7 connectors seem to come only as 1, 2 or 3meter S7-to-(BNS/DIN/RCA) adapter cables, which is way to long. What I'm looking for is a female S7 sonnector which can be mounted on a PCB or - less preferably - a solid (eg. no cable) S7-BNC adapter.Do you know of any manufacturer that does such thing? Price in this case is not a primary concern, so to speak.
Saab AUX Input  - Page 1
Forum section: electronics / projects

author: ScottG
author_rank: Newbie
timestamp: March 29, 2014, 05:50:14 pm
content: Over on Saab Central i started a discussion about how to make an unit that would emulate a CD changer in my car(An 2004 Saab 9-5 Arc). With that, a blogspot called BlueSaab was one designer of the unit. I built his unit and want to add on a bit.... by putting a bluetooth chip that would connect to my phone, rather than the 3.5mm jack* an cable would plugin to. From what i can gather, an Roving Networks RN-52 would get the job done. my problem: I've never designed a PCB in my life. I can solder rather well, Not an issue. I do think the unit is set up for an IPod 30 pin connector, there may be a way to exploit that to utilize the steering wheel controls.So: May you glorious people help? From what i can gather: the board i built is based around an Arduino AtMega 328, and runs with 5v. it has 5 IC's, one of them is a voltage regulator?Sorry for the abnormally large pictures, cant resize them..Blogspot: bluesaab.blogspot.comFirst unit built. *Note that the jack is no longer there, had to hard solder the cable as to much heat got to it attempting to fix the cold solder joints.Someone Else's unit:AND The most important items: The PCB and Schematic. I do have the Eagle files, please PM me if you would like them!The silk screen IS out of date, so you know. one of the voltage regs is different.
SAC305 or K100LD for lead-free hand-soldering? - Page 1
Forum section: electronics / projects

author: K3mHtH
author_rank: Regular Contributor
timestamp: March 30, 2020, 08:32:23 pm
content: Hey all,I'm finally transitioning to lead-free solder. I talked to Kester today to find equivalents of my favourite 63/37 water-soluble and no-clean solders and they gave me a few part numbers, with different compositions: SAC305 and K100LD.I'm unfamiliar with both and all I know from Kester is that SAC305 is more popular and more expensive. If you have experience with either (or ideally both!) please let me know.My main concern is reliability.. I'll be using this to attach connector headers and 1/4" panel-mount jacks to PCB's, so mechanical reliability is important.Thanks for your time
SAE J2497 compliance PLC transceiver - Page 1
Forum section: electronics / projects

author: punee995
author_rank: Newbie
timestamp: April 17, 2019, 11:24:58 am
content: I need SAE J2497 compliance PLC transceiver, so far I found Yamar SIG60 and another one is Intellon SSC P300(Obsolete). Can anyone suggest more transceiver?
Safe order for three signals GND TX RX - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: April 21, 2018, 02:07:49 am
content: I need a 3 pin header and I don't think there is any standard for it, but I could be wrong. What is the best order to keep someone from causing any damage/trouble by reversing the connector?TX is an output (driven output high/low)RX is an input (HiZ)This keeps the output in the middle...GND TX RX

author: KL27x
author_rank: Super Contributor
timestamp: April 21, 2018, 02:14:01 am
content: Putting the Tx in the center is fine, but isn't the Rx connected to a Tx pin on the other side? You would end up with a short between a Tx and a GND or other Tx any way you slice it, no?If you want to use a reversible 3 pin connector, it probably doesn't matter in the sense that it probably won't cause permanent damage. But you could check the datasheets. Or you could put a 10R resistor on your Tx and Rx pins.Safest is to wire it to a 4 pin header. Cut off one of the pins on the male side and plug the hole on the female side with hot snot or epoxy.

author: Monkeh
author_rank: Super Contributor
timestamp: April 21, 2018, 02:48:58 am
content: Both your TX and RX should be able to survive being shorted high, low, preferably somewhere above high (like 5V), and ESD from probing fingers.Sort that out and you'll not have to worry about the order.

author: xrunner
author_rank: Super Contributor
timestamp: April 21, 2018, 02:50:20 am
content: Quote from: KL27x on April 21, 2018, 02:14:01 amThat's what I was going to say.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: April 22, 2018, 12:11:39 pm
content: From an ESD point of view it is very preferable to make the GND connection first.When using standard 0.1" connectors you can push the GND pin out a bit, so it makes first contact.Putting in small series resistors help a lot in preventing ESD damage and also help in preventing damage from short circuits. But they may limit the baudrate, especially on long cables.With a 5 pin connector you can have 2 GND pins on the outside. Then two pis for Rx or Tx, and a single pin in the middle. This would make your connector reversible.I suggest the GND pins on the outside, because it is likely the connector will be first inserted under a slight angle and the outside pins make first contact then.