hybridfree/eevblog-posts huggingface dataset:
SD Card as a n64 storage device? - Page 1
Forum section: electronics / projects

author: IonizedGears
author_rank: Regular Contributor
timestamp: August 02, 2013, 11:10:52 pm
content: I had the idea long ago of adding a SD card to a platform like the n64. Letting the hardware side alone for now, would it be possible to add some eeproms and flash a custom firmware onto them which would add a GUI to the start up where I can change system settings and which game to load from the SD card with the option to also load from the the proprietary cartridge. Does anyone know if this will be possible and what language the n64 would require.

author: Rerouter
author_rank: Super Contributor
timestamp: August 02, 2013, 11:45:27 pm
content: from a few quick searches, namely "nintendo64 language" it appears to be multi-threaded C at least for the games,

author: marshallh
author_rank: Unknown
timestamp: August 02, 2013, 11:49:44 pm
content: http://64drive.retroactive.be/I thought the same thing several years ago, and so there it is. I learned a lot from building it (and selling lots of them)

author: IonizedGears
author_rank: Regular Contributor
timestamp: August 03, 2013, 12:31:40 am
content: Quote from: marshallh on August 02, 2013, 11:49:44 pm200 bucks? Surely that can't be right...what are the parts alone worth???

author: senso
author_rank: Frequent Contributor
timestamp: August 03, 2013, 12:40:33 am
content: They say you should ask for at least 3x the cost of the parts/assembly, so something along 50-60$, maybe a bit more, but imagine how many hours where invested into software, even at 1$ an hour the 200$ only cover 200 work hours..

author: marshallh
author_rank: Unknown
timestamp: August 03, 2013, 01:24:48 am
content: If you want to know why that's the price, I'll tell you.But first you should spend 2 years developing and then market/sell a product so that you can understand from my perspective..

author: IonizedGears
author_rank: Regular Contributor
timestamp: August 03, 2013, 02:16:00 am
content: I commented on the price aspect before i saw that the drive used a FPGA. It was sort of a first thought reply.

author: ben_r_
author_rank: Frequent Contributor
timestamp: August 03, 2013, 05:25:26 am
content: Wow that is really cool. Not worth anywhere near $200 to me, but Im sure there are plenty out there to whom it is. Hell thats more than I paid for the console AND games (granted not as many as this thing can give you) when it was all current gen and brand new. Pretty cool still.And FWIW there is also Everdrive64 which is I believe cheaper:LINK
SD card boot delay? - Page 1
Forum section: electronics / projects

author: Peabody
author_rank: Super Contributor
timestamp: April 04, 2019, 02:23:36 pm
content: I'm working on a microSD card bootloader for MSP430 processors, and need to know if I need to add a delay to allow the SD to boot up and become responsive - in addition to the time the processor needs to boot up. The data I've seen on SD cards specs "Power Up Time" as 250ms. But it defines that as "0V to Vdd min". So that appears to be talking about the slope of the Vdd voltage. Besides, I can't imagine an SD card requiring 1/4 second to boot up.Does anyone know what the best practice is for adding such a delay? The cards will be small SD cards, not SDHC.I assume the same issue would apply to hot insertion. The CD(Dat3) pin will go high immediately, but is additional delay required?

author: Jeroen3
author_rank: Super Contributor
timestamp: April 04, 2019, 02:30:34 pm
content: SD cards have a quite a powerful processor inside. I'd guess the card simple doesn't respond when it's not ready yet.
SD Card ECC Errors - Page 1
Forum section: electronics / projects

author: tristan
author_rank: Contributor
timestamp: September 09, 2011, 08:39:46 am
content: Does anyone here have much experience with the use of MicroSD cards in industrial applications? We have designed and currently manufacture a product used on electric vehicles which uses a MicroSD card for data storage. Everything seemed to be working fine but we appear to have a problem with data corruption on the memory cards.We have recently added software to check the card for errors at power up if an unclean shutdown is detected. This simply attempts to read each block of data from the card in turn. We are seeing large numbers of ECC errors (read data error token 0x04). When we do see them we overwrite the block in question with zeros which I would expect to clear the error which it does in some cases. However after doing this other blocks on the card will report ECC errors and we never seem to be able to clear them all.Does anyone have any experience of this or ideas of what could be causing large numbers of ECC errors? The problems do not occur on the bench but they do on the vehicle which points to some kind of noise or EMC related problem but information on this type of problem seems thin on the ground.ThanksTristan

author: Psi
author_rank: Super Contributor
timestamp: September 09, 2011, 09:43:58 am
content: i don't really have experience with this but i do remember from the Openmoko neo1973 mailing list that sd/microsd cards are very picky about timing and it varies quite a bit between brands.Cheap sd/microsd cards often don't meet the official timing specs.So if i was you i'd first try a good quality sandisk card and see if that gives any problems.If you get errors with a sandisk card then it's a pretty good sign that there's a timing problem in your code that talks to the card.

author: IanB
author_rank: Super Contributor
timestamp: September 09, 2011, 06:13:43 pm
content: Also check your power supply. I believe SD cards need a very clean and very stable power supply (3.3 V I think). On a vehicle you might be experiencing some power supply glitches.
SD Card Partition Boot Sec & Formatting - Page 1
Forum section: electronics / projects

author: @rt
author_rank: Super Contributor
timestamp: March 15, 2018, 07:27:10 am
content: Hi GuysI’ve been following this page, among others, to map the FAT32 and FAT16partition boot sectors in order to parse card information out of them.https://www.compuphase.com/mbr_fat.htmSo far, all is well, but I’ve noticed something peculiar with the volume label.When I format or rename the SD Card in MacOS, the label is read as expected.When I format or rename the SD Card in Windows 7, the label is read as“NO NAME”, even though both Windows 7, and MacOS can read and displaythe expected name. If I rename the same card in MacOS, my routine extracts it fine again.The issue is the same for SD with FAT16, and SDHC with FAT32.What does Windows 7 do differently when formatting or renaming SD Cards?

author: @rt
author_rank: Super Contributor
timestamp: March 16, 2018, 02:44:17 am
content: Well I found the solutionMacOS writes the 11 character volume label to the correct offset in the partition boot sector of the SD Card.Windows 7 (and probably other Win versions) writes a file to the volume root directory, and this file is given the VOLUME attribute.The VOLUME file attribute is unique, and not the same as HIDDEN, READONLY, ARCHIVE, or any others.The volume file doesn’t show up in a browser just because it's configured to show hidden files, since HIDDEN is an attribute of it’s own.The name of the volume file that would normally be an 8.3 file name, can be interpreted as an 11 character ASCII stringthat still needs a null termination for copy with sprintf or for display. I assume this file is otherwise useless.Now I can display the volume label no matter what OS formatted or renamed the CD Card!

author: @rt
author_rank: Super Contributor
timestamp: March 16, 2018, 04:12:24 am
content: Thanks for the linkI’ll still have to decide which overrides which.For now, the file entry overrides the partition sector location.I assume that will always display the label that bothWin and MacOS would.Next is to support long file name entries.The library does this as a compile time option,but I think I can handle it.

author: @rt
author_rank: Super Contributor
timestamp: March 16, 2018, 10:09:30 am
content: Windows 7 writes the file entry, but not the partition boot sector. It still says “NO NAME”,but in that state, MacOS will still read and display the name correctly.MacOS at least writes the partition boot sector, but may also write the file. I haven’t tested that.

author: @rt
author_rank: Super Contributor
timestamp: March 16, 2018, 06:23:58 pm
content: Rather than look at the VFAT entries to get long file names,I opened every MP3 file to extract data from id3 tags.
SD HC Compatible with SD in SPI Mode? - Page 1
Forum section: electronics / projects

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: October 04, 2014, 09:36:14 pm
content: I wrote my SD driver to support older (2GB or smaller) SD cards in SPI mode, but now they're getting hard to find.Are the newer, SDHC cards compatible with the SD SPI standard? The SD Card Association's specs are somewhat vague on this point.

author: marshallh
author_rank: Unknown
timestamp: October 04, 2014, 09:41:59 pm
content: The spec doesnt mandate it explicitly, but yes, basically 100% of cards out there suport SPI.

author: Apothus
author_rank: Contributor
timestamp: October 05, 2014, 03:19:58 am
content: I use 4GB SD-HC cards with SPI with no trouble so far. Using the FatFS library as well.However I have never filled up more than a GB on these cards although i cant ever see that being an issue.

author: johnwa
author_rank: Frequent Contributor
timestamp: October 05, 2014, 05:23:54 am
content: Just be careful, I discovered that the protocol to access SDHC cards is different to plain SD, and there is still some code floating around that only supports the smaller cards. However, I have found that the library athttp://www.roland-riegel.de/sd-reader/works for both types.

author: SeanB
author_rank: Super Contributor
timestamp: October 05, 2014, 06:24:28 am
content: I still have 4 512M cards here still sealed in the clamshells, bought for $1 on clearance, they are just in case I get an old camera that falls flat with a card over 1G.

author: Jeroen3
author_rank: Super Contributor
timestamp: October 05, 2014, 03:50:34 pm
content: If your software supports SDHC, it should also support SD. The other way is not guaranteed.SD cards aren't hard to find for industrial appliances, refer to digikey or other suppliers.

author: marshallh
author_rank: Unknown
timestamp: October 05, 2014, 03:52:38 pm
content: At the hardware layer, old SD 1.0 is byte-accessed, while SD 2.00 and later (inclding HC) is LBA-addressed.Also you must poke some more commands to get 2.00 mode.
SDRAM Module Tester System... - Page 1
Forum section: electronics / projects

author: STM32
author_rank: Newbie
timestamp: November 24, 2022, 08:05:41 pm
content: Hello guys,I had this posted somewhere else, but because I still didn't get any response yet, I thought I would give it a shot here. I need to move to layout and production of PCB as soon as possible, but I prefer to get some ideas and feedback before I proceed.I need to build a system to test a bunch of existing memory modules built around 512 Mbit SDRAM chips (4 chips each for total of 256 MBytes). The attached schematic shows the original design of the memory module and how it's connected to the MPU of target system. Apparently the MPU used has 30-bit address lines and 32-bit wide data bus. I believe that's why they only exposed two CS signals on the edge connector. On the STM32F429, there are two SDRAM banks, two unique NEs and CKEs for two SDRAM devices. However, for the purpose of testing the entire memory on the module, I need to be able to perform read/write tests on all chips, that is four for this module.The question is, what would be the best approach to do it when only two CS signals are exposed on the edge connector of the module? Of course, on the STM32F429 based board, address, data bus, CAS, RAS, WE, CLK, BA0/1, DQMU/L signals are going to be shared. With two CS signals used for all 4 chips, the only feasible scenario I have in mind is to use two buffers to switch address signals between upper and lower chips, and another two 16-bit transceivers to switch data bus signals between upper and lower chips. I was wondering if there's any better way to do it. The only unique signals for each chip (on the original design of module) are the DQMU/L signals. Could it be possible to use those to enable/disable a chip at a time?** Update **The SDRAM used is:K4S511632D-UC75Datasheet:https://www.datasheets.com/en/part-details/k4s511632d-uc75-samsung-electronics-21914437#datasheet
SDS 1104X-E SPI trigger not triggering on correct MISO bit position - Page 1
Forum section: electronics / projects

author: jeraymond
author_rank: Contributor
timestamp: June 16, 2020, 07:48:53 pm
content: Hello,I'm trying to setup a SPI trigger on the first bit of the MISO signal (purple). It seems to only trigger on the last bit. The screenshot shows the trigger staying in the same position regardless of the Bit Pos 0 or Bit Pos 7 setting.Am I using the trigger settings correctly here? I've double check the signal mappings are correct as is the Bit Order. They match my Decode settings which are correctly decoding the values being sent over the wire.

author: tautech
author_rank: Super Contributor
timestamp: June 19, 2020, 09:33:41 am
content: Can you please confirm firmware version ?
SDS Symbol / logo on PCB - Page 1
Forum section: electronics / projects

author: TrickyNekro
author_rank: Frequent Contributor
timestamp: January 23, 2024, 08:07:32 am
content: Hi!A quick question, does anybody know what SDS in strange italic letters ( more as a logo ) means?Found it on a PCB next to the material rating of the said PCB ( PLC1, CTI>400 ), so I would guess that it is either some kind of test the PCB passed,or some kind of standard, or some kind of material of the PCB or PCB material manufacturer, but I can find little information online.Maybe it is because I do not understand the logo correctly, here is a sample:https://www.ebay.com/itm/115953861324Thanks,Lefteris

author: TrickyNekro
author_rank: Frequent Contributor
timestamp: January 23, 2024, 12:44:05 pm
content: Well... after spending almost 1 - 2 days searching and nugging a couple connections,the SDS logo is the logo from a German PCB manufacturer, nothing to do with certification or rating.I leave it here for the next poor soul that will scour the Internet trying to find such a detail.Cheers!

author: TimNJ
author_rank: Super Contributor
timestamp: January 23, 2024, 04:53:26 pm
content: When in doubt about PCB markings, you can always checkhttps://iq.ul.com/pwb/If you wonder whether the logo/symbol you see is the PCB manufacturer's trademark, look for some numbers/letters nearby which might correspond to the PCB material designator. (In this case "S2".)Search "S2".Usually the trademark is included in the UL yellow card.

author: TrickyNekro
author_rank: Frequent Contributor
timestamp: January 23, 2024, 10:46:23 pm
content: Teach a man to fish right?I wasn´t aware that UL offered such a database.This will come in handy!Thank you!- Lefteris

author: TimNJ
author_rank: Super Contributor
timestamp: January 24, 2024, 05:16:27 pm
content: Quote from: TrickyNekro on January 23, 2024, 10:46:23 pmYes, any material/component with a UL file number, tested to UL standard has a "yellow card". These items usually have safety function or need to remain safe under certain conditions. So, materials/components related to mains isolation, fire safety, and so on.https://iq.ul.com/https://productiq.ulprospector.com/en
SDS011 dust sensor, checksum errors - Page 1
Forum section: electronics / projects

author: m_t
author_rank: Contributor
timestamp: February 15, 2018, 02:31:42 pm
content: Hi, has anyone here used the SDS011 dust sensor before? I'm using the USB-to-serial adapter that came with the sensor on a Raspberry Pi Model B Plus and I get occasional checksum errors. I'm wondering if those are really transmission errors or just a way for the sensor to indicate a measurement is invalid since all other values including the actual measurements are just fine:PM 2.5: 2.200000, PM 10: 9.100000header : passcmd : passchecksum: failchecksum: 0x0a, expected: 0x0dtail : passHere's my codehttps://github.com/m-thu/sandbox/blob/master/sds011/sds011.cand some shell scripts to generate plots:https://github.com/m-thu/sandbox/tree/master/sds011.
SE to diff converter - Page 1
Forum section: electronics / projects

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 24, 2010, 03:55:51 am
content: While looking through the datasheet for the DRV1100, I noticed that the suggested circuit for converting a SE signal to a differential signal (for input to the DRV1100) used two opamps in a strange "hourglass" feedback loop. (http://www.ti.com/lit/gpn/drv1100, page 9) Is there any reason that peculiar circuit was used instead of a standard inverting amplifier with a gain of -1?

author: DJPhil
author_rank: Frequent Contributor
timestamp: October 24, 2010, 01:38:57 pm
content: I'm not quite sure, but I'll guess.The 500 ohm resistors look like a fixed Wheatstone bridge. This makes the resistance between any two points equal and dependent on all four resistors (ratiometric relationship). The upside to this is that it's more stable against low tolerance parts and thermal drift. The bottom opamp sets that whole network up as a virtual ground equal to the input ground, so it's really a very stable way to bias the midpoint in your differential signal.If I understand it correctly it's actually a solid and elegant solution.Hope that helps.
Seamless power mux - Page 1
Forum section: electronics / projects

author: Dubbie
author_rank: Unknown
timestamp: October 01, 2021, 04:16:39 am
content: I have a device which will have 2 separate 14V lipo batteries. The current draw of the device will be about 5AEach battery will be plugged into a separate input.The logic I want to follow is as follows.On powerup, select the battery with the highest voltage and use ONLY that one (Battery A).If the battery depletes or is physically unplugged, then seamlessly, (would prefer less than 2V drop given same battery voltages) switch over to battery B.Battery B is continued to be drained, regardless of whether a fresh battery A is inserted. Once B is drained or removed, then seamlessly switch back to A. repeat.I'm sure there are people here with experience with this sort of thing. Is there an off the shelf product available, or should I build a MUX using mosfets and a microcontroller to provide the switching logic? The batteries have integrated battery managers that will shut them off when they deplete. How exactly would I detect that a battery has been removed? will the bulk caps hold the voltage up and make the micro think the power is still good? I'm a bit unsure about this part.Thanks for any input.

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 01, 2021, 04:38:24 am
content: Take a look at power ORing hot swap controllers, there's most likely one that will do exactly what you're trying to do.

author: Dubbie
author_rank: Unknown
timestamp: October 02, 2021, 08:05:01 am
content: Thanks for your input.I think I am going to use a couple of "ideal diode" controllers controlling a couple of N-FETsI am looking at this TI part: TPS241.I'll have a regular OR diode setup before the switches powering a small microcontroller that will handle the logic of enabling/disabling the ideal diodes.Because they are diodes, I figure I can sense the falling voltage on the supply side and quickly switch over with the micro, before the load side caps have a chance to fall too far.I think I'll build up a prototype before including it in my main board in case it blows up
Search an IC for simple encrypted radio link  - Page 1
Forum section: electronics / projects

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 24, 2017, 04:57:21 pm
content: Dear All,I want to make a very simple encrypted radio link with a device sending info over a HC-12 module.The speed is moderate 9600/19200 bdsThe requirement is low power ( < 10 mW if possible )A possibility would be to use a MCU to do te encryption, but it may not be the more economical solution in term of electrical power.The encryption scheme does not need to be full proof. Just to make it not completely obvious.My question is wether there exists a IC that does it automatically with a pair of encryption/ decoding IC ?Thanks

author: Kjelt
author_rank: Super Contributor
timestamp: January 24, 2017, 05:04:49 pm
content: Most of the ready made ics protocols are obsolete and deprecated, would not recommend that.Besides if it is broken you can not upgrade or change the key. You really would like to make it unique with your own key, but NOT with your own encryption scheme, that you should use from what is around.My advise is to use a simple 8 bit uC and take a look at XTEA only ten lines of code or better AES128 but that will take more processing power and time.https://en.m.wikipedia.org/wiki/XTEA

author: JimRemington
author_rank: Regular Contributor
timestamp: January 24, 2017, 05:09:56 pm
content: Many of the radio chips (for example RF69) implement AES, which is reasonably secure.https://lowpowerlab.com/2013/06/20/rfm69-library/

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 24, 2017, 09:11:04 pm
content: Thanks,I did not realised that these RF69 had the AES encryption.Can you confirm that HC-12 has no encryption ? I could not find the information, but it seems to me thatthere is nothing.

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 25, 2017, 12:00:33 pm
content: The problem I see with the RF69M is that the interface is SPI.This will then require an additional MCU, which is not the best thing for my low power need.Is there a solution with a module that accepts directly RX/TX ?Thanks

author: Miyuki
author_rank: Frequent Contributor
timestamp: January 25, 2017, 02:34:47 pm
content: MCU can be at 1-2 mW running even at decent speed and few uW in sleeping mode

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 25, 2017, 03:37:19 pm
content: If I need to add a MCU, I will as well use the advice of Kjelt, and use the HC-12 which I have plus a MCU running XTEA.Quote from: Kjelt on January 24, 2017, 05:04:49 pmI cannot rely on sleep mode, as the flow of data is continuous.I will make some implementation and keep you informed of the results (although it may take time ).
Search for elastic (vibration damping) pcb support - standoff - Page 1
Forum section: electronics / projects

author: ciccio
author_rank: Frequent Contributor
timestamp: August 19, 2019, 12:29:46 pm
content: I'm searching for a PCB support / standoff (similar to he plastic ones made by RICHCO and others) to mount a PCB on top of another one, but made with an elastic material (rubber?) to reduce vibration and shocks transmitted to the top PCB.I've seen similar ones in computer enclosures, to support Hard Drives, but I was not able to source them.Any information will be truly appreciatedBest regards

author: nali
author_rank: Frequent Contributor
timestamp: August 19, 2019, 12:48:45 pm
content: Essentra are pretty good for mounting hardware. They havethis onefor example.

author: Miti
author_rank: Super Contributor
timestamp: August 19, 2019, 04:22:21 pm
content: Try "damping balls" at hobbyking.com.

author: ciccio
author_rank: Frequent Contributor
timestamp: August 19, 2019, 06:16:58 pm
content: Quote from: nali on August 19, 2019, 12:48:45 pmThanks, I could not find it on Essentra's Italian site.I will call them.Best regards

author: edpalmer42
author_rank: Super Contributor
timestamp: August 19, 2019, 06:30:20 pm
content: If you search for "anti-vibration" there are lots on places like ebay or aliexpress.Ed
Search for multimeter LCD display - Page 1
Forum section: electronics / projects

author: AlcidePiR2
author_rank: Regular Contributor
timestamp: July 31, 2020, 09:47:08 pm
content: Hi All,I am searching for replacement for a LCD display. I nearly find the one I needhttps://www.aliexpress.com/item/32920933993.html?spm=a2g0o.productlist.0.0.3fe13094IkDNek&algo_pvid=095a3752-0d08-4846-8b74-d64af2a283cd&algo_expid=095a3752-0d08-4846-8b74-d64af2a283cd-20&btsid=0b0a22a415962317324995510ead4e&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_The only difference with my specification is the inversion of pins 1 and 21.- Is there a chance that there is a misprint in the Aliexpress specifications ?- Does anybody know a source for the proper display ?Thanks

author: mariush
author_rank: Super Contributor
timestamp: July 31, 2020, 10:29:41 pm
content: Digikey has that lcd display in multiple versionshttps://www.digikey.com/product-detail/en/orient-display/OD-358R/2544-OD-358R-ND/12089216https://www.digikey.com/product-detail/en/orient-display/OD-358T/2544-OD-358T-ND/12089259https://www.digikey.com/product-detail/en/orient-display/JAZZ-EC-PO/2544-JAZZ-EC-PO-ND/12314052https://www.digikey.com/product-detail/en/orient-display/JAZZ-EC-PMG/2544-JAZZ-EC-PMG-ND/12314051https://www.digikey.com/product-detail/en/orient-display/JAZZ-EC-PMY/2544-JAZZ-EC-PMY-ND/12314054https://www.digikey.com/product-detail/en/orient-display/JAZZ-EC-PMG/2544-JAZZ-EC-PMG-ND/12314051- com on pins 1 and 40https://www.digikey.com/product-detail/en/orient-display/OD-357/2544-OD-357-ND/12089211

author: AlcidePiR2
author_rank: Regular Contributor
timestamp: August 01, 2020, 10:01:01 am
content: Thanks,I had searched in Mouser and RS but obviously not enough. I also realized my mistake. I used DC, while one should use AC on these. Now I have COM on 1 and 40, as in these datasheets.
Search term to find reverse mount SMT LEDs that don't need a PCB hole - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: March 09, 2024, 09:11:54 am
content: Can anyone think of an easy way to find reverse mount LEDs that don't need a PCB hole.I know they exist, but finding them is proving hard due to them being mixed in with the kind that need a hole.I want to reverse mount them but just shine them through PCB with solder mask removed.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 09, 2024, 10:06:10 am
content: And the light escapes how?Reverse Mount Chip LED?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 09, 2024, 11:13:24 am
content: A much easier to source alternative is to use a side-firing LED - this may well shine enough light into the FR4.Use a mask in the copper to get the shape you want ( resist alone is usually not opaque enough.If bleed between LEDs is an issue, you can use a row of small plated holes to help block transmission through the FR4

author: Psi
author_rank: Super Contributor
timestamp: March 09, 2024, 12:14:34 pm
content: Quote from: Terry Bites on March 09, 2024, 10:06:10 amYou mount the LED upside down, remove the copper and solder mask from the PCB on both sides in a selected area or shape. You get that shape light up on the other side of the PCB.It's used for making illuminated indicator lights on PCB front panels.

author: Psi
author_rank: Super Contributor
timestamp: March 09, 2024, 12:15:30 pm
content: Quote from: mikeselectricstuff on March 09, 2024, 11:13:24 amWill give that a try, thanks Mike

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 09, 2024, 12:40:14 pm
content: If you need more light you could also use multiple side-firing LEDs facing each other
Searching 3.3V RS485 driver with isolation in one package - Page 1
Forum section: electronics / projects

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 04, 2015, 11:06:22 am
content: Hello!Is there such a part out there, what i could find was either a BGA package or 5V only.I think i saw something like this allready,a completely isolated (data+power) RS485 driver in a single module that runs of a 3.3V rail.To reduce the footprint and have a handy solution, lets say about 8€ for a single chip/module.Greetings,Peter

author: stefanh
author_rank: Contributor
timestamp: June 09, 2015, 12:54:05 am
content: The ADM2587E might be suitable for your requirements. It is a 16pin Wide SOIC that operates off either 3.3V or 5V.
Searching a small bluetooth module for a robot controller board - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: June 19, 2013, 11:17:05 am
content: Hi,i made a protoype of a robot controller board with the rn-42https://www.sparkfun.com/products/10253, now i'm designing the final pcb and i want to use something smaller, max 15x10 mm.I don't have any experience in RF design so something with an integrated antenna is better.The only thing that i found that is very small and with an antenna is this panasonic modulehttp://it.mouser.com/ProductDetail/Panasonic-Electronic-Components/ENW-89829A2JF/?qs=sGAEpiMZZMsGelYiB%252bjhZmM3nTqKvM8JPAsJMi03dJs%3d, but for what i understand i can't use like the rn-42 that simply shows up as a serial port, but i have to make a btstack in the host MCU, a dspic, and communicate via HCI to the module.Sorry for my bad english and thank you for all the help.

author: 0xFFFF
author_rank: Contributor
timestamp: June 19, 2013, 11:41:02 am
content: I'd go for something likethis.They cost peanuts, work well and are easy to interface with.

author: daedalus
author_rank: Regular Contributor
timestamp: June 19, 2013, 11:42:06 am
content: the Panasonic module is a bit of a PITA to use, there are samples with TI micros, but for everyone else its a bit of a pain finding compatible BT stacks. When I last looked btstack had some provisional support, but I never tried it out.http://code.google.com/p/btstack/source/browse/wiki/CC256x.wiki?r=1505

author: Unknown
author_rank: Unknown
timestamp: June 19, 2013, 01:30:42 pm
content: Quote from: 0xFFFF on June 19, 2013, 11:41:02 amThis is basically the rn42 but thank you for the interest

author: os40la
author_rank: Regular Contributor
timestamp: June 19, 2013, 02:43:17 pm
content: Quote from: 0xFFFF on June 19, 2013, 11:41:02 am0xFFFFDo you have the docs/pinouts for that device. I could not find any info on their ebay page.

author: peter.mitchell
author_rank: Super Contributor
timestamp: June 19, 2013, 03:17:51 pm
content: i was looking around at similar products just the other day; unfortunately they all seem to be approximately the same size.

author: Chet T16
author_rank: Frequent Contributor
timestamp: June 19, 2013, 03:24:51 pm
content: Quote from: os40la on June 19, 2013, 02:43:17 pmThis should be the same.http://www.mcu-turkey.com/wp-content/uploads/2013/01/HC-Serial-Bluetooth-Products-201104.pdf

author: Unknown
author_rank: Unknown
timestamp: June 20, 2013, 01:36:58 pm
content: I found this modulehttp://www.ti.com/product/lmx9838, it is pretty small and i can get samples!!!

author: AlfBaz
author_rank: Super Contributor
timestamp: June 20, 2013, 02:05:59 pm
content: Hmmm...Quote

author: Unknown
author_rank: Unknown
timestamp: June 20, 2013, 03:44:06 pm
content: Quote from: AlfBaz on June 20, 2013, 02:05:59 pm??

author: AlfBaz
author_rank: Super Contributor
timestamp: June 20, 2013, 03:48:35 pm
content: Quote from: exapod on June 20, 2013, 03:44:06 pmThe date... April fools
searching a smd component - Page 1
Forum section: electronics / projects

author: jochefo
author_rank: Newbie
timestamp: June 23, 2014, 08:43:13 pm
content: hi, right know i'm working on an h-bridge for driving a motor. I manage to make the h-bridge with some mosfets and it works fine but know i'm stock because i feel the control part is not safe. if you turn on the two sides of the h-bridge by mistake you can burn the mosfets. I manage to make a system with some optocuplers and invertes to control the h-bridge with just two pins (PWM and Direction).But then I was wondering if there is an electronic device like a relay that can do the trick but in smd package. just like a normally open-normally closed configuration with a common pin that I can place the PWM signal.Thank all for your time.

author: kizzap
author_rank: Unknown
timestamp: June 24, 2014, 02:49:33 am
content: Generally the two sides of the H-bridge are driven by a single transistor, which has the outcome you are after.Basically when both inputs to the transistors are the same, the mosfets bring the device it drives to either the high voltage or low voltage potential, with the net effect that there is no voltage differential across the device. So not possible to burn them.-kizzap
Searching availability of the BSI CMOS Image sensor online(features attached) - Page 1
Forum section: electronics / projects

author: kankanas
author_rank: Contributor
timestamp: January 22, 2021, 03:43:41 pm
content: Hello,I am a Master's Student and for my project I need a BSI CMOS image sensor with the specification attached.Process:1P5M 65 nm BSI CMOSDie size:5 × 5 mm2Pixel size:1.1 × 1.1 μm2Pixel array Total:1600(H) × 2056(V)[3.2 MegaPixel]Active:1536(H) × 2040(V)Active area:1.69 mm (H) × 2.24 mm (V)ADC resolution:10 bitMaximum frame rate:45 fpsPower consumption:182.8 mWPower supply:2.8 VSensitivity:1.05 V/(lux·s)Conversion gain:120 μV/e-Full well capacity:3200 e-Till now, I came across of the sites1.https://www.mouser.in/2.https://www.onsemi.com/But with the exact specification(if not all at least 1P5M 65 nm BSI CMOS,1.1 × 1.1 μm2, 1536(H) × 2040(V), 45 fps in a compact device) I am not able to find. On other note, if I get one matching parameter other is deviating lot.I am referring a paper where 65 nm BSI CMOS,1.1 × 1.1 μm2 pixel width,Pixel array Total(3.2MP)---- are the main USP to search for.Can anyone please help me or give me some idea to look for?Thanks,Kankana
Searching data about IC 082CPP (4 1/2 Digit A/D Converter) - Page 1
Forum section: electronics / projects

author: dj831
author_rank: Regular Contributor
timestamp: February 01, 2024, 07:08:34 pm
content: Hi everyone, does anyone have some data about vintage 082CPP, a 4 1/2 Digit LED A/D Converter in a 30 pin DIP chip (a DIP 28 case with a golden 'bar', linking pins 1 & 30 together)? I was not able to identify manufacturer, Faichild perhaps. That IC was used in 20.000 pts meters, like OM20 (AOIP micro ohmmeter) or in some French meters (CdA / Chauvin Arnoux, but I was unable to find which ones). It drives LED digits with an SN/DS75492, and values are available in BCD format, hence using an external 74C48 segments BCD to 7-segment decoder.Thanks for the data you could share

author: moffy
author_rank: Super Contributor
timestamp: February 02, 2024, 03:09:51 am
content: I only know of one 41/2 digit ADC in a similar 28pin package, the ICL7135 :https://www.farnell.com/datasheets/76687.pdfIgnoring the bar could it be a rebranded/packaged version of it?

author: floobydust
author_rank: Super Contributor
timestamp: February 02, 2024, 03:30:35 am
content: I think I see another set of markings on the IC? As if the 082CPP was an after label.OT - from the ICL7135 datasheet, who is George?

author: coromonadalix
author_rank: Super Contributor
timestamp: February 02, 2024, 03:53:29 am
content: seems rebranded there's some faint markings ??

author: dj831
author_rank: Regular Contributor
timestamp: February 04, 2024, 07:18:20 pm
content: Hi, many thanks to everyone for your answersSadly, this is not the same component at all: 082CPP has 30 pins, and most important IIRC, a full scale of 200mV vs. 2V for the ICL7135. I've used the 7135 from time to time, an excellent component, having main drawback of that 2V FS (or 200mV if used with a chopper amplifier). Anyway, I've asked AOIP about the schematics of OM20 micro ohmmeter, and if they reply (generally, they do), I let you know.And about George, WTF??? This not the first time I've used the ICL7135 datasheet, but never noticed that 'Easter egg' (?). If someone from Intersil passes by, any data about George is welcome
Searching for a cheap Digital DC Brush Servo Drive 24V 1A or an IC - Page 1
Forum section: electronics / projects

author: Kjelt
author_rank: Super Contributor
timestamp: November 30, 2017, 04:43:46 pm
content: I have done practically zero with motors but now find myself in a need to run in small steps a 30V 1A DC brush motor (3800rpm) with an attached HEDS5540-A11 rotary encoder (500 steps/rev and 3 channel (A/B/I).The motor hardware is already built and integrated in the device so replacing it with a stepper is unfortunately not an option.So I was searching how these things are operated and found out that there are nice ready built Digital DC Brush Servo Drives like a Leadshine DCS303.However the ones I can find are all for huge powers, like 100W or 15A and more, resulting in pretty expensive devices (>$65 a piece)That is not what I am looking for, I only need 15-30W max.So does anyone with experience know where I could find:- cheap low power (30V or 24V 1A) Digital DC Brush Servo Drives (< $25 a piece)OR- an IC that handles the PID control of the motor with rotary quadrature encoder inputs and the usual STEP,DIR, etc. inputs(if extra external fets for the h-bridge need to be added that is ok).Thanks

author: H.O
author_rank: Frequent Contributor
timestamp: December 01, 2017, 04:43:46 pm
content: There are a couple of ICs that does this but AFAIK they all "just" programmed microcontrollers. Those that springs to mind (coming from the DIY CNC community) are thePICServo SCfrom JR Kerr, theUHU chipfrom Uli Huber and my own "UHU replacement". None of these provides the power stage, you need external bridge, current sensing and so on (an LMD18200 for example). That doesn't meant an all in one chip doesn't exist though.How many drives are we talking about here?EDIT: Fixed url tags.

author: Kjelt
author_rank: Super Contributor
timestamp: December 01, 2017, 07:11:43 pm
content: Thanks for the info, will check those ic's and projectsHow many? Just four or five, it is for a hobby project of mine.

author: Kjelt
author_rank: Super Contributor
timestamp: December 01, 2017, 07:47:09 pm
content: That LMD18200 ic looks interesting, perhaps I can easily write some pid code myself to drive the motor, yet another project for Xmass

author: james_s
author_rank: Super Contributor
timestamp: December 02, 2017, 12:03:39 am
content: Will this do what you need?http://elm-chan.org/works/smc/report_e.htmlI built one several years ago to play with and it worked fine.
Searching for a one chip battery charger/balancer and gas gauge solution - Page 1
Forum section: electronics / projects

author: Electr0nicus
author_rank: Regular Contributor
timestamp: August 01, 2012, 01:47:06 pm
content: As the title says, for a current project I'll have to design a battery charging system.Here are the Specs:3-4 Lion or LiPoly cells connected in series.Battery capacity ranging from 2.2Ah to 4.5Ah whatever the user needs.The system is used to power a embedded Linux system.So what I need, is preferably a one Chip solution, which does the following tasks:* Charging the battery pack with preferably a load balancing function (f.e. I can tell the chip with a programming resistor, that the maximum wall adapter current is 4A. If the Linux system uses f.e. 3A the charger automatically adjusts the charging current to 1A, in order not to overload the wall adapter)* Cell balancing* Implementing a gas gauge function, which supplies data about the battery to a µCI've searched for a few hours on the internet, but only found chips dedicated to one function, which can be charging or gas gauging.So is there a chip available which does all those things in one?Best regardsElectr0nicus

author: PeterG
author_rank: Frequent Contributor
timestamp: August 01, 2012, 02:00:34 pm
content: +1 here.Regards
Searching for a simple way to use AS-interface - Page 1
Forum section: electronics / projects

author: printplaatreparatie.nl
author_rank: Contributor
timestamp: March 26, 2020, 01:30:15 pm
content: Hi there, I got hold of some Eaton Rapid Link 4.0 Frequency controllers and motor starters. I would like to use them in a to-be-determined project, but I have no idea how to use the AS-interface in a simple way, without spending a lot of money and leaning to program a PLC.I found this raspberry pi board:https://tinyurl.com/tv4g356but found no information how to use it.Ideally, I would like to use an (industrial) Arduino or simular open-source device to get those units to behave.Can anyone shine some light over the black box of AS-interface? All I can find is how amazing it is (for machine builders with a nice budget.)
Searching for an H-bridge motor driver IC and a good step-up converter - Page 1
Forum section: electronics / projects

author: FlashEF
author_rank: Contributor
timestamp: November 02, 2012, 08:13:56 pm
content: I would like to build a motor driver for my mini-sumo robot, that would have a step-up voltage converter and a nice MOSFET H-bridge. The idea is to use 7,4 V nominal 2 cell li-po batteries, and convert their voltage to constant 9V, optimum for many small DC motors. I used to use L298 IC for driving DC motors, but in the current project I'd need at least 2 of them in parallel (3,2A peak per motor, while L298 has a limit of 3A non-repetative current). I would much prefer to use some sort of a logic driver for H-bridge that has PWM/2-bit mode interface (dir and break), similar to what L298 has. I have a hard time finding one thought. Maybe someone has good experience with some IC of that type? External H-bridge is tempting, case I could select premium transistors and protection diodes, as well as organize heat dissipation myself. In sumo robots DC engines are likely to function near the stall current for most of the fight, and that has to be kept in mind.Secondly, the step-up converter. I have similar problems finding one suitable for ~7A required in this application. Most of those I did find where in QFN packages, which are a real pain...http://www.datasheetcatalog.org/datasheet2/2/052daje928cw7pc0uqs1ipyryppy.pdf

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: November 02, 2012, 09:45:21 pm
content: TheST L9958is a pretty full featured integrated bridge which can drive up to 8.6A. It's self protected, can perform current limitation and has diagnostic capabilities (OC, OL) via SPI. Derivates of it are used in automotive projects to drive e.g. throttle blades.Some Chinese guy sell it as module on eBay, like this one:http://www.ebay.com/itm/240W-high-power-H-bridge-Motor-Driver-module-smart-car-driver-Arduino-/150780559603Then again, the 240W they given there are a bit exaggerated of course especially since they use the PowerSO16 (the PowerSO-20 would be a bit better from a thermal point of view). Then again, the heatsink is quite impressiveIf you need higher currents, external MOSFETs or two combined halfbridges are the way to go I guess, but a proper thermal design is getting more and more important then.
Searching for best 3v3 SMD LDO Regulator to be used with LiIon Battery - Page 1
Forum section: electronics / projects

author: Feliox
author_rank: Newbie
timestamp: November 29, 2014, 06:49:18 pm
content: Hello, I'm searching for lowcost 3v3 LDO positive regulator to be used with LiIon battery. The regulator should have built in shutdown function, enabling me to basicaly turn off load while charging and powering my device from external source (USB). Thanks!

author: c4757p
author_rank: Super Contributor
timestamp: November 30, 2014, 12:24:26 am
content: There aretonsof parts that match that - you're basically just asking for an LDO with enable! How about this:AAT3221. Available in 3.3V, up to 150mA (subject to dissipation limits of course!), super-low quiescent current, US$0.17 in singles, etc etc.Or one of the other 99352 LDOs out there

author: veryevil
author_rank: Unknown
timestamp: November 30, 2014, 08:59:09 pm
content: Have a look at theTI TPS70933
Searching for equivalent package sizes for nonstandard parts - Page 1
Forum section: electronics / projects

author: Pack34
author_rank: Frequent Contributor
timestamp: January 13, 2022, 04:08:15 pm
content: I'm trying to track down a potential drop-in replacement for a non-standard MOSFET. Is there an efficient way to do this?It's the part in the link below.https://www.digikey.com/en/products/detail/infineon-technologies/BSB008NE2LXXUMA1/5959891Infineon calls this part MG-WDSON-2, CanPAK M™, and 3-WDSONA similar part (also from infineon) can be found in the link below.https://www.digikey.com/en/products/detail/infineon-technologies/IRF6717MTRPBF/2095838?s=N4IgTCBcDaIJICUBiA2A7ARjQWQCoIAUAhJAAhAF0BfIAThey call this one DIRECTFET™ MX and DirectFET™ Isometric MX.
Searching for lampholder for xenon strobe - Page 1
Forum section: electronics / projects

author: PP7BB
author_rank: Contributor
timestamp: August 11, 2014, 06:25:39 pm
content: I want to make small xenon strobe. Unfortunately they require kV to operate. That is why I am looking for proper lampholder. I found one with starting/ignition coil built in:http://www.strobe.com/component/option,com_virtuemart/Itemid,32/page,shop.product_details/flypage,nova_flypage/product_id,134/category_id,89/manufacturer_id,0/But supplier is in USA - to get stuff from them would be pricy in EU. I heard that we have xenon flashtubes manufacturer in Europe - Heimann Opto, and they should have similar lampholder. But I can't find their website with lightsources. I know they are Perkin Elmer now - PE aquired Heimann some time ago. Finding corp. website is not hard, but I cant find any info related to xenon strobes - prices, dimensions, sales contacts. Ebay and others have only strobes without lampholder.I want make small, room - sized strobe. Not a monster one, I am beginner :-) .If someone knows good source of this kind of light in Europe... Please let me know.

author: aargee
author_rank: Frequent Contributor
timestamp: August 12, 2014, 02:33:50 am
content: In the past, Xenon strobe kits used 6-8pin valve (tube) plugs and sockets.The kV needed is only to trigger the discharge, usually the dump supply is 3-400VDC stored in caps.

author: Someone
author_rank: Super Contributor
timestamp: August 12, 2014, 03:26:36 am
content: Hamamatsu parts are sold in one off quantities through many scientific suppliers, it'll be expensive wherever you buy from. Unless you are building a specialised device it would be easier to find an old camera flash and work with that, the large studio flash units are cheap to buy.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: August 12, 2014, 03:39:38 am
content: Why not just solder the bulb in since serviceability shouldn't be an issue?The ignition coils are not expensive or hard to find. If you had to, you could take on from an old (no doubt disused) film camera.

author: IanB
author_rank: Super Contributor
timestamp: August 12, 2014, 03:54:13 am
content: Beware that xenon strobes get hot in operation because of the constant power being fed into them. I think this means they need a proper socket that can take the heat. There is also a risk of explosion, so they should be enclosed to catch any flying shrapnel.

author: PP7BB
author_rank: Contributor
timestamp: August 12, 2014, 05:20:19 am
content: THX for all replies.Some kV are require to ignite the lamp. For safety purposes I would like to have coil built in lampholder.I would like to buy new lamp - not used one. Just can't find the supplier.