hybridfree/eevblog-posts huggingface dataset:
anyone here tinker with fiber lasers (doped fiber, not just fiber coupled)? - Page 1
Forum section: electronics / projects

author: KTP
author_rank: Frequent Contributor
timestamp: July 10, 2013, 01:38:44 pm
content: I am getting the itch to buy a small used fiber laser as they are getting very cheap on the used market (sub $3000). I have a few Synrad and Coherent CO2 lasers and also some various flashlamp pumped YAG bricks (not really good for anything usefull because the rep. rate is too low). I do have a 100 watt arc lamp pumped YAG head from a old medical laser but I sold the supply for it years ago....besides it is a beast and used 3 phase.These little q-switched Ytterbium fiber lasers with a mJ or so peak power and 10 to 20 watts average power could be quite fun for light material processing or experiments. I am looking at the ones made in germany by IPG. A few pounds, powered off wall AC, compared to 20 years ago 3 phase 600 pound beasts requiring a chiller.Not sure if anyone here has ever worked with these, but thought I would ask.Yes, I know 1.07um is quite a bit less eye safe than 10.6um but I have several pairs of OD10 goggles in that wavelength and some experience experimenting with YAG and diode lasers.
Anyone ID this 2x16 blue LCD display? .. - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: July 10, 2013, 08:58:35 am
content: HiBought this 2x16 blue LCD module off ebay sometime last year but can't now find the datasheet so that I can write some code for it.Anyone have any ideas?

author: airiclenz
author_rank: Contributor
timestamp: July 10, 2013, 09:02:08 am
content: Did you try to use the standard HD44780 interface for it? Here is a link to some datasheets and example code for a similar LCD.Airic

author: Unknown
author_rank: Unknown
timestamp: July 10, 2013, 09:06:25 am
content: Quote from: airiclenz on July 10, 2013, 09:02:08 amNot yet Airic, but I think your right with it being a standard HD44780. Just thought I'd ask incase anyone happen to know the where abouts of the programming datasheet for this module.I'll just assume it's a normal HD44780 module, I've used them before so I'll use the code to do a quick test.

author: mariush
author_rank: Super Contributor
timestamp: July 10, 2013, 09:37:31 am
content: It's standard hd44780 or clone... just be careful at the pin order, it's written with silkscreen on the board

author: Unknown
author_rank: Unknown
timestamp: July 10, 2013, 09:39:36 am
content: Quote from: mariush on July 10, 2013, 09:37:31 amThanks.Yes, I noticed the silk screen looks reversed over the pin numbers. Typical.

author: askjacob
author_rank: Newbie
timestamp: July 10, 2013, 01:38:47 pm
content: Yah, I have a few of these, they are a standard HD44780 interface, they are happy to do 8 bit or 4 bit. Won't show a thing though without VO setup (use a 5-10k trimpot, adjust until the top row of boxes become just visible) and of course, the usual proper power up initialisation etc as per HD44780.I am currently pulling my hair out with one in a project where I can't get it working. Was going to blame the LCD, but it works fine when hooked up to a bus pirate (damn handy for this kind of testing!) sooo I know I can only blame my code, or wiring...The backlight LED power is 5v, the dropper resistor is on the PCB.CheersJacob

author: baljemmett
author_rank: Unknown
timestamp: July 10, 2013, 01:40:10 pm
content: Quote from: Pippy on July 10, 2013, 09:39:36 amAt least they seem to be in sequential order - the most recent such module I've used had them numbered 16, 15, 1, 2, ..., 13, 14. Ugh.

author: Unknown
author_rank: Unknown
timestamp: July 10, 2013, 02:37:35 pm
content: Thanks Jacob.Yes I know about V0 pin, no problem. I've used the 2x16 lcd modules before, just not this exact module, so just wanted to my suspisions is all really.
Anyone interested to photo undamaged chip from table scales? - Page 1
Forum section: electronics / projects

author: hanakp
author_rank: Regular Contributor
timestamp: June 29, 2023, 11:52:06 am
content: I repaired tabletop scales today, they had classical construction with a chip bonded to PCB and covered with a black epoxy blob. But next to the blob, I discovered a bare chip loosely stuck to the PCB. It's probably the same chip which came loose during manufacture. I don't have any strong enough digital microscope to make photos, though. The chip will probably contain pretty standard amplifier + ADC + MCU + LCD interface, but still, there could be some surprises. Plus, I couldn't find die photos of similar a chip online. The chip has about 1.5 x 1.5 x 0.3 mm. Any takers?BTW, I got the scales beause they had high power consumption when turned off, they constantly drew 20 mA from 3 V. It was caused by three 10 uF ceramic 0603 decoupling capacitors, all had terrible leakage. It dropped to few uA after I replaced them.
Anyone know a good 2A BuckBoost IC ? - Page 1
Forum section: electronics / projects

author: whatsthegeek
author_rank: Contributor
timestamp: November 13, 2017, 10:21:52 pm
content: HiI'm working on an Arduino clone and I want to use a BuckBoost converter instead of a linear regulator.Do anyone know a good single chip BuckBoost IC that does at least 2 amps (preferably in SOIC)?I searched a bit on google and the only things I can find are either impossible to buy on LCSC (https://lcsc.com/products/DC-DC-Converters_484.html) or are only capable of less than 1 amps :/Hope someone can help, thanks !

author: Nusa
author_rank: Super Contributor
timestamp: November 13, 2017, 10:57:23 pm
content: Single-chip solutions exist. e.g.http://www.ti.com/power-management/non-isolated-dc-dc-switching-regulator/buck-boost-inverting/converter-integrated-switch/products.html#p1129=Buck/BoostI wouldn't bet on them being cheap enough to go on an arduino clone, however.

author: mariush
author_rank: Super Contributor
timestamp: November 13, 2017, 11:02:36 pm
content: what's your input voltage range?what's your budget for this regulator?For example, there's LTC3112 but somehow i doubt you're willing to pay 5$ for each when you order 100pcs or more. Or 6$+ for LT1370 for example...why do you need 2A ... the chip needs only a few mA to run, and it can only output around 15-25 mA per pin but you're not supposed to power things from the pins... you use transistors or mosfets to turn on/off stuff which is powered from separate power supply.Also careful about layout and what you choose, a switching regulator so close to the chip may affect the ADC of your arduino and mess it up (too much noise for the adc to work right)

author: whatsthegeek
author_rank: Contributor
timestamp: November 13, 2017, 11:12:50 pm
content: Thanks for the replies !I had already taken a look at the TPS63060 but unfortunatly, I don't have the tools required to hand solder QFN :/And yeah, the LT1370 is WAAAY too expensive because I will only be making 5 or 10 boards ^^I need the 2amps because I'm planning on adding servo connectors on the clone. One servo draws aprox 200ma when turning, so I need to be able to supply enough current for at least 4 servos + thelights, screens or other devices the use might want to connect.Also, thanks for the advice for the board layout, I'll try to put the BuckBoost converter at the opposit side of the PCB ^^
anyone know anything about this boost module? - Page 1
Forum section: electronics / projects

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: May 24, 2015, 08:50:23 am
content: hi everyonedoes anyone own or know anything about this step up module:http://www.ebay.com.au/itm/New-600W-DC-DC10V-60V-to-12V-80V-Boost-Converter-Step-up-Module-car-Power-Supply-/331457056813?pt=LH_DefaultDomain_15&hash=item4d2c61502dits just that it seems to good to be true and my guess is at that price it probably is.thanks

author: SeanB
author_rank: Super Contributor
timestamp: May 24, 2015, 09:05:14 am
content: Well, not the best capacitors used on it, and they probably will fail in a year, but otherwise looks reasonable, and for the price quite good. Just treat the ratings as an absolute max, and run at roughly half the current and with lower voltage input. You probably will change them if you want long life, and at least they do include a fuse for safety.

author: Seekonk
author_rank: Super Contributor
timestamp: May 24, 2015, 10:24:27 am
content: Haven't used one of those yet but have lots of the 150W versions. I won't use those at any more than half the rated wattage and the caps are just good enough to make it stable. Always place extra caps at input and output.
Anyone know of a Buck Equivilent to a NCP1402? - Page 1
Forum section: electronics / projects

author: TheRuler8510
author_rank: Regular Contributor
timestamp: August 28, 2014, 03:20:02 am
content: Anyone know of a Buck Equivilent to a NCP1402?Digikey does not allow you to search for lowest quiescent current. So what I really need is a very low quiescent Buck converter that will switch input voltage in the range of 6-10V down to 3.3V.The NCP1402 is a nice Boost converter with 1 uA of off-state leakage current, which I guess is the same as quiescent.Thanks,
Anyone Know Of A Good WXGA 15.6 in LCD? - Page 1
Forum section: electronics / projects

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: October 16, 2016, 11:40:32 pm
content: My asus K53SV has a 1366x768 display. Unfortunately, the LVDS cable doesn't have enough conductors for any higher resolution panels.My existing display looks like crap, and unfortunately, so do all the other panels I have tested at work. I work at a place that takes apart laptops and sells the parts, so I have quite a plethora of screens I can test.What I mean is that the vertical viewing angles are crap. We have all seen it with low end LCD displays, where when viewed straight on, black looks light on the bottom.Does anyone know of a laptop model or LCD model that looks good? I know the probook 6450b's 1600x900 display looks great, but I can't drive panels at that resolution. My mom has the probook 6550b with a 1366x768 panel, and like all the other wxga panels I have tested, it looks like crap.Bonus points if you can suggest a panel from ebay sellers electro_room or gotlaptopparts.Thanks!

author: amyk
author_rank: Super Contributor
timestamp: October 17, 2016, 02:20:19 am
content: You can try here:http://www.panelook.com/modelsearch.php?op=advancedsearch
Anyone know of any available video bufffers with clamping? - Page 1
Forum section: electronics / projects

author: MatCat
author_rank: Frequent Contributor
timestamp: September 10, 2013, 06:42:57 pm
content: I am on the lookout for something like the max4032/max4090 however nothing of the type seems to be in production anymore, anyone know of anything that is still in production and fairly available in quantities less then 1000? (There is the ISL59112 which is still in production but only available in quantities of 3000), thanks!

author: fcb
author_rank: Super Contributor
timestamp: September 10, 2013, 09:42:25 pm
content: Not hugely helpful - I always used to roll my own with a 4016B or 4066B as the clamp.
Anyone know something about this display? - Page 1
Forum section: electronics / projects

author: nardev
author_rank: Unknown
timestamp: February 28, 2018, 09:59:19 am
content: This is some old "picture frame" and it looks like the display is functioning so since i have few of those, i would like to use only the display in some other project. However, i don't know anything about this display nor did i ever reverse engineer it.So, just in case, if you have any tips how should i try to investigate this.. or if anyone know how to find some tech docs about this display i would be gratefulthnx

author: plazma
author_rank: Frequent Contributor
timestamp: February 28, 2018, 10:02:30 am
content: Google those codes on the sticker. Manufacturer seems to be Tianma.

author: nardev
author_rank: Unknown
timestamp: February 28, 2018, 10:09:10 am
content: Ou, i tried it LOOOOOooong time ago didn't find anything.. will try again.. thnxp.s. looks like there is some tech data now... Just wondering what can drive it...https://docs.toradex.com/103195-tianma-tm070rbh10-datasheet.pdf

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: February 28, 2018, 02:59:49 pm
content: I was wondering if they could be used to feed vga signal to it and use it as a display... for something.

author: nardev
author_rank: Unknown
timestamp: February 28, 2018, 06:01:35 pm
content: Well, would be very happy if beaglebone/rpi was possible to show somethinghas samenumber of pins as rpi touch screen.. however i didn't check the pins yet...

author: ajb
author_rank: Super Contributor
timestamp: February 28, 2018, 06:49:54 pm
content: Quote from: nardev on February 28, 2018, 10:09:10 amThat datasheet shows a 50 pin connection with 24-bit parallel RGB interface. The flex out of your particular module only has 26 pins, so that can't be it. I think this is the datasheet you want:http://www.beyondinfinite.com/lcd/Library/Tianma/TM070UDH01-V1.4.pdf

author: nardev
author_rank: Unknown
timestamp: February 28, 2018, 07:18:15 pm
content: Quote from: ajb on February 28, 2018, 06:49:54 pmThank you Sent from my LG-D858HK using Tapatalk

author: amyk
author_rank: Super Contributor
timestamp: March 01, 2018, 01:47:49 am
content: Notice the TM070UDH01datasheet has in its revision history "Modify the Module Name from TS070OAAAD01-00"... whereas you have apparently a TS070OAAAD02-00, and that leads us tohttp://www.beyondinfinite.com/lcd/Library/Tianma/TM070UDH02-V1.4.pdfI guess everyone who thinks that O is actually the number 0, is rightly confused. There's plenty of search results for TS0700AAAD02, mostly sellers, but using the letter O will give you the right results.
anyone know this connector? - Page 1
Forum section: electronics / projects

author: jeroen79
author_rank: Frequent Contributor
timestamp: March 01, 2019, 08:27:55 pm
content: Does anyone know this conenctor?It looks like a Molex Micro-fit but instead of 3.0 mm pitch it is 2.7 mm.I need a 2x2 plug with female crimpcontacts.

author: aamirchef135
author_rank: Newbie
timestamp: March 01, 2019, 08:44:10 pm
content: It is dishwashing machine main PCB Jake I think I have many of them need?Sent from my SM-G935F using Tapatalk

author: coromonadalix
author_rank: Super Contributor
timestamp: March 01, 2019, 10:16:48 pm
content: are you sure theyre not 3mm ce3ntered pins ??Micro MATE-N-LOK 3 mm Connector System ??

author: DaJMasta
author_rank: Super Contributor
timestamp: March 01, 2019, 10:32:28 pm
content: Didn't check all the angles to the individual pin shrouds, but appears to be a standard 24 pin ATX power supply connector?Looks like these are 4.2mm pitch, though.

author: jeroen79
author_rank: Frequent Contributor
timestamp: March 01, 2019, 11:14:46 pm
content: The pitch is definitely 2.7 mm.But the similarity to the Molex 3.0 mm and 4.2 mm is striking.But I can't find much when looking for this.Anyone know suitable search terms?It comes from an old Nokia carkit.Maybe something made specifically for them?

author: coromonadalix
author_rank: Super Contributor
timestamp: March 01, 2019, 11:22:09 pm
content: could you try another picture of the characters on the side pa66 something ??i think we use this connector in one of our machine, its an sub assembly we install in it, not in my department but ill check it

author: tsman
author_rank: Frequent Contributor
timestamp: March 01, 2019, 11:53:37 pm
content: Quote from: coromonadalix on March 01, 2019, 11:22:09 pmPA66 means Polyamide 66 i.e. Nylon.

author: jeroen79
author_rank: Frequent Contributor
timestamp: March 02, 2019, 12:57:49 am
content: Quote from: coromonadalix on March 01, 2019, 11:22:09 pmOne side says:>PA66/6<The other side says:ChinaTO 12On the top and bottom pins 1, 12, 13 and 24 are marked.
anyone knows a distance sensor (steps 0,2mm) with digital protocol interface ? - Page 1
Forum section: electronics / projects

author: Kjelt
author_rank: Super Contributor
timestamp: August 14, 2018, 08:48:02 am
content: Hi can someone recommend a distance sensor with the following properties:- contactless measurement (so ultra sound/light or other means)- distance 0-30cm- accuracy 0,2 mm or better- output: digital protocol , preferred rs485 or something resilient like that.- price:around $50not that importantWhat I found were some ultrasound sensors but they all have an analog output, or programmable binary output for a certain distance.I can not find one that returns the measured distance over a protocol. I could interface it with a uC myself but rather have it integrated in the sensor.

author: CM800
author_rank: Frequent Contributor
timestamp: August 14, 2018, 09:05:25 am
content: Quote from: Kjelt on August 14, 2018, 08:48:02 amAre you able to attach something to it? e.g. a suitable reflective surface, optics etc.?Have a look at these:https://www.baumer.com/gb/en/product-overview/distance-measurement/optical-distance-sensors-/c/289

author: Kjelt
author_rank: Super Contributor
timestamp: August 14, 2018, 09:16:22 am
content: Good question, answer is noThe object is not reflective.I need to move the object into a certain distance so I have to measure the distance during the move till it is in the right position.

author: StillTrying
author_rank: Super Contributor
timestamp: August 14, 2018, 10:37:45 am
content: - contactless measurement (so ultra sound/light or other means)- distance 0-30cm- accuracy 0,2 mm or betterI'd be surprised if you find anything that can do 0.07%+ accuracy over that distance!

author: AndyC_772
author_rank: Super Contributor
timestamp: August 14, 2018, 10:48:15 am
content: This can be done with a magnetic sensor, though it won't be $50. PM me if you'd like some details.(Dis)claimer: I designed it.

author: odessa
author_rank: Regular Contributor
timestamp: August 14, 2018, 11:14:02 am
content: Time of flight sensors are pretty accurate and use I2CLook at the VL53L1, there's an arduino library available for it too

author: Kjelt
author_rank: Super Contributor
timestamp: August 14, 2018, 11:44:29 am
content: Quote from: odessa on August 14, 2018, 11:14:02 amThanks but two issues: starts at 40mm and error is +/-20mm but interesting little thingy for other purposes
Anyone knows this header/connector? - Page 1
Forum section: electronics / projects

author: prot_brot
author_rank: Contributor
timestamp: March 20, 2015, 09:06:21 pm
content: This is the header on the PCB:...and the header's footprint:I'm planning to make battery pack and GPIB module for my Fluke 45. Unfortunately, the main PCB has this funny looking header to connect the card via ribbon cable. I can't get any information about it.Yes, the fastest way would be soldering wire directly to the main PCB, but I'll keep that as the last option if possible.

author: prot_brot
author_rank: Contributor
timestamp: March 20, 2015, 09:31:54 pm
content: Quote from: blueskull on March 20, 2015, 09:20:09 pmWow.. Thanks!

author: dom0
author_rank: Super Contributor
timestamp: March 20, 2015, 10:37:43 pm
content: Quote from: blueskull on March 20, 2015, 09:20:09 pmThe L stamped on them tells me that those are actually Lumberg Micromodul. PicoFlex might be compatible, though.

author: free_electron
author_rank: Super Contributor
timestamp: March 20, 2015, 11:01:15 pm
content: LUMBERG

author: SL4P
author_rank: Super Contributor
timestamp: March 20, 2015, 11:32:43 pm
content: They look expensive, but also look reliable!

author: dom0
author_rank: Super Contributor
timestamp: March 21, 2015, 12:04:09 am
content: Not at all.http://www.reichelt.de/Micromodul-Verbinder/2/index.html?&ACTION=2&LA=2&GROUPID=5217Except for the crimping tool, of course :-)

author: Psi
author_rank: Super Contributor
timestamp: March 21, 2015, 12:13:54 am
content: "Would you like a $1000 tool to crimp your $0.01 crimp connector pin"If you crimp 100,000 pin then the tool has cost you another $0.01 on top of the connector pin price.

author: prot_brot
author_rank: Contributor
timestamp: March 21, 2015, 05:30:28 am
content: Thanks! I checked Picoflex and Lumberg Micromodul, both are very similar.and 1255EUR for crimp tool??seems like a chopstick and pliers will do the job.

author: David_AVD
author_rank: Super Contributor
timestamp: March 21, 2015, 05:36:13 am
content: I had to replace a couple of those PicoFlex connectors once. What a pain in the arse without the correct tool. Buy a spare as you'll likely mangle the first one.
Anyone make a SSR with discrete high power FET's? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: December 23, 2020, 02:02:30 pm
content: I'm looking for a solid state relay that can switch and continuously carry 15A AC or DC. This will be used in a circuit that will have low voltage applied (1-5V) when ever switching the high currents 10-15A , however the relay will be exposed to as much as 250V AC or DC when open.Mechanical relay is not an option.IXYS has some nice 500V SSRs (CPC1968) that I'm using for lower currents, these are rated up to 5A with a heatsink. Beyond that current level, there does not appear to be much available.There are numerous guides to a roll your own design such as this:https://www.homemade-circuits.com/solid-state-relay-ssr-circuit-using-mosfets/I would not want to introduce any loading on the switched current so I would use a tiny isolated DC/DC to drive the gates.Would like to hear from anyone that has built one and any issues discovered in the process.

author: BravoV
author_rank: Super Contributor
timestamp: December 23, 2020, 02:34:21 pm
content: Well, I did, but not similar with above circuit variants pointed by you link, mine was simpler using VOM1271 chip, just read the datasheet for examples, and its fully isolated.

author: dmills
author_rank: Super Contributor
timestamp: December 23, 2020, 02:42:18 pm
content: SiLabs Si875x series are good for this, faster then the photomos stuff as well.I use them for loudspeaker protection together with a pair of butch mosfets, works well.Regards, Dan.

author: Jester
author_rank: Frequent Contributor
timestamp: December 23, 2020, 02:54:18 pm
content: Dan,I just discovered the Si8751, looks ideal for this application.I found a great article.....https://sound-au.com/articles/mosfet-relay.htm

author: dmills
author_rank: Super Contributor
timestamp: December 23, 2020, 04:19:03 pm
content: Looks about right, I used a pair of IR TO-247 things as I recall, but I cannot remember the numbers offhand.
Anyone messing around with Sodium batteries? - Page 1
Forum section: electronics / projects

author: cybermaus
author_rank: Frequent Contributor
timestamp: March 07, 2024, 10:04:07 am
content: I have fallen a bit into the Sodium hype. Them being much more environmentally friendly, with only slightly less energy density than lithium.And more robust to boot, as in, better able to deal with low discharge abuse and better able to deal with below freezing temps.So I bought some 18Ah cells to experiment.So far they work as expected.Meaning, their biggest challenge is the very wide voltage span: 2V to 4V from empty to full.(well officially 1.5V to 4V, but there is no more real energy below 2V)So on a 4 cell (12V nominal) you need equipment able to handle 8V~16VAnd on a 8 cell (24V nominal) you need equipment able to handle 16V~32VMost equipment does not handle those ranges. Often they have a cutoff at 11V (22V)I modded an 24V inverter to not have a low-cutoff anymore, and that seems to work well.(I bought a old 24V one. It was just old enough to have discrete OpAmps for the low volt detection so a fairly easy mod)My plan (for my mini camper) is to get 8 cells 200AH (24V nominal), and pay attention to use only equipment that has the full 12V+24V dual voltage car+semi volt ranges.And the modified inverter of course.Just need to figure out how to best deal with the remaining non-dual voltage stuff.A step down seems obvious, but it should have really low standby current.

author: moffy
author_rank: Super Contributor
timestamp: March 07, 2024, 10:42:01 am
content: FYI read:https://www.eevblog.com/forum/projects/sodium-ion-battery-evaluation/msg5156514/#msg5156514

author: cosmicray
author_rank: Frequent Contributor
timestamp: March 07, 2024, 11:35:17 am
content: To use this properly, you would need a voltage multiplier that operates on fractional multipliers. I've seen an academic paper or two on this subject, and typically having to do with energy harvesting.

author: cybermaus
author_rank: Frequent Contributor
timestamp: March 07, 2024, 11:49:06 am
content: Sorry, you lost me here?I need a voltage multiplier for energy harvesting?I have the impression you are responding to a different topic than what I was bringing forward.If not, please explain a little better.
Anyone Near Portland OR Let Me Borrow a 10 GHz VNA/SA - Page 1
Forum section: electronics / projects

author: Alaezae
author_rank: Contributor
timestamp: April 27, 2025, 08:39:25 pm
content: Hello,I'm currently working on a layout for a 10 GHz Power Amplifier board. I'm almost ready to have boards fabbed, but I will have no way to test them. The best NanoVNA only goes up to 4 GHz, and that's about the limit of what I could afford myself. I got laid off a few months ago and lost access to the lab I was going to use to test this.If anyone in the area is willing to help me out I'd much appreciate it! I'd even be willing to rent the equipment for some time if you're worried about getting it back in a timely manner.Thanks!
Anyone recognise this pressure sensor? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: June 21, 2017, 11:21:20 am
content: It's a 4 pin low pressure, water tolerant type which I'm guessing has an analogue output.Low cost, low pressure, water resistant sensors aren't very common so I'd be interested to know the manufacturer or sensor family to which it belongs.Short video athttps://youtu.be/IsqceV3I_kg?t=174Product page athttp://www.hendersons.co.uk/boattank/tank-level-gauge.html

author: leblanc
author_rank: Regular Contributor
timestamp: June 22, 2017, 01:33:53 am
content: Perhaps a Honeywell pressure sensor? They come in a variety of packages and ranges. I've used one of their products in the past, they look similar.https://sensing.honeywell.com/sensors/board-mount-pressure-sensors

author: e100
author_rank: Frequent Contributor
timestamp: June 22, 2017, 07:09:18 am
content: Quote from: leblanc on June 22, 2017, 01:33:53 amCouldn't find anything that had the same package outline.Looking at the video more closely it looks like the part numbers have been scrubbed off the sensor and adjacent op amp.
Anyone recognise this Serial Data format? - Page 1
Forum section: electronics / projects

author: max_torque
author_rank: Super Contributor
timestamp: February 07, 2016, 09:11:34 pm
content: In an idle moment i thought it might be interesting to look at the serial data stream used by Shimano for their "electronic" bike gear shifting system (Di2) It uses a data stream over the power lines (2 wires), obviously AC coupled over the low DC volt supply. It uses a 1Mhz carrier, but the actual encoding is a bit of a mystery to me!Here are some scope shots of the data that is transmitted when a shift button is pressed:When a button is pressed, there is a burst of activity:These are individual groups of data, separated by about 1msIt starts with some sort of "wake up" maybe:A lot of the bursts seem to be unanswered:but some get a reply (maybe it's scanning multiple bus addresses??)All are modulated around the carrier freq of 1 Mhz:It might be using amplitude modulation, but it doesn't look consistent enough for that:If it were just doing OOK, then you expect the start and ends of the carrier pulses to be truncated, but they seem to reduce in amplitude, rather than just cut off. And the zero amplitude parts are not a fixed length.I suspect they haven't designed there own coms protocol tbh, more likely they have used some existing standard for which transceiver ICs are available??Any suggestions clever people???

author: miguelvp
author_rank: Super Contributor
timestamp: February 07, 2016, 10:18:35 pm
content: Some kind of DTMF encoding?

author: Dago
author_rank: Frequent Contributor
timestamp: February 08, 2016, 06:33:11 am
content: AFAIK Shimano uses CAN for the communication.

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: February 08, 2016, 06:58:09 am
content: Can you get the preamble of each packet more visible?
Anyone recognize this dcdc buck converter IC? - Page 1
Forum section: electronics / projects

author: sparkswillfly
author_rank: Contributor
timestamp: February 18, 2020, 06:58:36 am
content: Trying to identify this chip

author: sparkswillfly
author_rank: Contributor
timestamp: February 18, 2020, 11:31:33 pm
content: I think it is 3x3x0.85mm PQFN or similar type package. Has large inductor and 3 resistors plus caps. No external diodes or switches.
Anyone reverse-engineered CRC for TI TPS92662-Q1? - Page 1
Forum section: electronics / projects

author: rafalekrav40
author_rank: Newbie
timestamp: June 15, 2025, 10:12:40 am
content: Hi everyone,I'm currently working with the Texas Instruments TPS92662-Q1 device, which communicates over a uart binary protocol. Each message includes a 2-byte CRC at the end. I'm trying to reverse-engineer the CRC algorithm used, but standard methods don’t seem to work.What I’ve figured out:The data block before the CRC is 15 bytes long.I’ve tried multiple known CRC-16 variants, including:CRC-16-IBM / MODBUS (polynomial 0xA001, init 0x0000, LSB-first)CRC-16-CCITTXMODEMand several online CRC calculatorsNone of them produce matching CRC values for known-good message frames.Example message data (17 bytes):0-init1-addr device?2-addr register?3-14 data15- CRC_L16_CRC_H0x2D, 0xE7, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x7C, 0x7C, 0x7C, 0x00, 0x00, 0x7F, 0x4Fsome sample frames with correct CRC:0x2D 0x64 0x30 0x00 0x00 0x00 0x00 0x65 0x00 0x00 0x65 0x65 0x00 0x00 0x65 0x9D 0xB10x2D 0x25 0x30 0x72 0x00 0x00 0x6D 0x6D 0x00 0x00 0x6D 0x6D 0x00 0x00 0x65 0x76 0xDD0x2D 0xA6 0x30 0x0C 0x00 0x00 0x0F 0x14 0x00 0x00 0x32 0x4C 0x00 0x00 0x65 0xB4 0x2BThe issue:Texas Instruments has refused to share the full datasheet or CRC specification, so I'm stuck trying to figure it out by trial and error.I suspect the CRC might use a non-standard polynomial, different bit ordering, or even a custom checksum algorithm.Has anyone worked with the TPS92662-Q1 or cracked its CRC algorithm?Any tips, examples, or even guesses would be really helpful.Thanks in advance!

author: Psi
author_rank: Super Contributor
timestamp: June 15, 2025, 10:39:52 am
content: It's CRC16/ARC, byte order is reversed from how you read it.According to herehttps://crccalc.com/?crc=2DE73000000000007C007C7C7C0000&method=CRC-16&datatype=hex&outtype=hexI love that website for figuring out CRC, it spits out every common type. Most require you to click and change the CRC type.I also checked 0x2D 0x25 0x30 0x72 0x00 0x00 0x6D 0x6D 0x00 0x00 0x6D 0x6D 0x00 0x00 0x65 0x76 0xDD and it worked for that too.
Anyone still make radio buttons? - Page 1
Forum section: electronics / projects

author: rea5245
author_rank: Frequent Contributor
timestamp: May 26, 2019, 09:20:57 pm
content: Hi,Does anyone still make radio buttons, i.e. an array of push buttons where if you push one in, the others pop out?Thanks,Bob

author: austfox
author_rank: Regular Contributor
timestamp: May 27, 2019, 12:22:55 am
content: Search ‘Multi Station Switch’ on element 14. They have a couple of 4-way buttons.

author: rea5245
author_rank: Frequent Contributor
timestamp: May 27, 2019, 01:02:30 am
content: Thank you! Looks like Switchcraft sells models with up to 18 switches. They ain't cheap, though.- Bob

author: rcbuck
author_rank: Frequent Contributor
timestamp: May 27, 2019, 01:12:24 am
content: How many are you looking for and how many positions?

author: rea5245
author_rank: Frequent Contributor
timestamp: May 27, 2019, 01:18:12 am
content: Ten or 12 positions, and I'd just be making one unit.

author: bsfeechannel
author_rank: Super Contributor
timestamp: May 27, 2019, 02:53:02 am
content: Also look for push-button ganged switch bank, or simply ganged switch bank, or multi-key push-button switch. It is being produced byC&K, besides Switchcraft, for instance.

author: rcbuck
author_rank: Frequent Contributor
timestamp: May 27, 2019, 03:10:53 am
content: I've got a couple of 10 position Switchcraft units that are the lighted ones. They use a 327 type bulb but you don't have to use the bulb if you don't need it. One of the switches has all 10 caps. The other one only has 4 caps, other 6 must have gotten lost over the years. They are about 30 years old but should be fine if you clean the contacts. Switchcraft switches have always been top quality. The switches are 7 inches long and 1.1 inch wide.I also have three 4 position UID (no longer in business) switches. Two of them have square caps on the other one has round caps.I will never use them and you are welcome to them if you want them. If interested, PM me with your shipping address.

author: Benta
author_rank: Super Contributor
timestamp: May 27, 2019, 09:29:55 am
content: Search for ITT Schadow, they make them as a DIY kit with any number of positions.
anyone tried the Cake board and Biscuit board with more logical layout - Page 1
Forum section: electronics / projects

author: dentaku
author_rank: Frequent Contributor
timestamp: December 04, 2017, 11:14:23 pm
content: I've always hated that breadboards have that blank two rows down the center channel especially for projects that need -V, 0V ,+V AND that the outer power rails on normal breadboards don't line up with the other columns with their weird groupings of 5 holes then a gap.I was just looking at the Kickstarter site (I've actually never bothered looking at it before) and found the Cake board and Biscuit board and they have fixed both those design problems.https://www.kickstarter.com/projects/252587878/cake-board-new-lego-friendly-solderless-breadboardHas anyone here tried one?
Anyone tried the china HDEL brand isolated injection transformers BIT-001/002 ? - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: August 24, 2025, 09:49:14 am
content: Has anyone tried the china HDEL brand isolated injection transformers BIT-001/002 ?https://www.aliexpress.com/item/1005007356184416.htmlhttps://www.aliexpress.com/item/1005009270568021.htmlI'm in need of one to do a bode plot on DCDC, so looking for good value options.
Anyone tried these monocular micro display modules? - Page 1
Forum section: electronics / projects

author: plazma
author_rank: Frequent Contributor
timestamp: February 03, 2020, 06:44:20 pm
content: I would like to use one in a project. I would interface it directly with a microcontroller without the original PCB.I guess it's a parallel bus display without a frame memory.Any idea about the manufacturer of the module? Kopin?https://www.aliexpress.com/item/4000163096203.html

author: ebastler
author_rank: Super Contributor
timestamp: February 03, 2020, 06:52:06 pm
content: Hmm, neat! Thank you for pointing these out. Makes me want to think up a project to use one.But won't 240*320 pixels be a bit disappointing? The display will pretty much fill your field of view, if they did a decent job with the lens design, and then the pixels will be very visible indeed.

author: plazma
author_rank: Frequent Contributor
timestamp: February 04, 2020, 08:13:37 am
content: Quote from: ebastler on February 03, 2020, 06:52:06 pmI need to only display numerical information. The display will be placed about 5-10cm away from the eye to the bottom of the view.I'll order one and check it out. Maybe the lens needs to me moved if used from a larger distance.DIY version of thishttps://www.shearwater.com/products/nerd-2/

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: February 05, 2020, 04:25:47 am
content: I wish you the best of luck, but the optics are likely to be quite challenging ... it probably has a high-dioptre lens to magnify the tiny LCD, which would make for a shorteye reliefand may preclude mounting on the outside of your mask.Have you considered using one of those small OLED displays?

author: plazma
author_rank: Frequent Contributor
timestamp: February 05, 2020, 08:46:01 am
content: I once tried a similar module. It had a focus point about 2m away so it does not strain the eye. The optics was sharp in the middle but got quite soft towards the edges.I have a selection of tiny monochrome OLED screens but they still need a lense. The resolution is also much worse with them. QVGA is optimal since I use that resolution on my wrist unit. The micro display can show the same screen.
Anyone tried these two miniature SMT C&K slide switches? - Page 1
Forum section: electronics / projects

author: Starlord
author_rank: Frequent Contributor
timestamp: January 03, 2016, 01:28:22 am
content: http://www.digikey.com/product-detail/en/PCM12SMTR/401-2016-1-ND/1640125http://www.digikey.com/product-detail/en/JS102011SAQN/401-1999-1-ND/1640114I've used the first one, but not the second. The first is smaller, but requires a surprising amount of force to switch, is more difficult to switch in one direction than the other, and feels like it might break. And I've tried a bunch of them it's not just one faulty switch. I'm wondering if the switching action of the slightly larger one will be smooth.I'm gonna buy one myself to test of course but I probably won't get it until late next week.
Anyone used 74HCT9046A with VCO disabled? - Page 1
Forum section: electronics / projects

author: GK
author_rank: Super Contributor
timestamp: July 13, 2016, 09:32:02 am
content: I'm using said part for its phase/frequency detector only. In the 4 the inhibit pin just disabled the VCO, in the 9 it disables the whole chip. This is annoying. I don't want an operable oscillator just sitting there buzzing away making noise. According to the freq.-out versus control-v chart for the VCO in the datasheet, below a bottom threshold for the control-v the VCO turns off. I'd like to know if this part is happy with the control voltage strapped to ground and without the attendant VCO R's and C fitted - that is no latch up, power up/down or other funky issues. Has anyone done this and can verify? I'm finalizing a PCB layout and if not I'll just have to put it on hold for a week or two for my parts order to arrive so that I can dead-bug a sample.

author: richard.cs
author_rank: Super Contributor
timestamp: July 13, 2016, 01:36:19 pm
content: I've used one with the VCO disabled by strapping the control voltage to ground, didn't see any sign of misbehaviour. I don't remember what we did with the VCO Rs and Cs, I suspect we put pads down but didn't fit any components.

author: Wolfram
author_rank: Frequent Contributor
timestamp: July 13, 2016, 02:04:45 pm
content: The VCO frequency-voltage graph is a bit deceptive in that it shows the frequency dropping below the bottom of the chart below approximately 1.1 V in, but it does not show how far it drops. My experience relates to the NXP 74HC4046A (which could conceivably use a similar VCO circuit). When the VCO voltage of the '4046A is brought below approximately 1 V, the frequency suddenly jumps to around half of fmin, and further lowering of the VCO voltage does not change the frequency.If this is also true for the '9046A, the VCO could end up switching with C1 = parasitic and R1 = R2 = infinite (likely dominated by internal leakage).

author: bktemp
author_rank: Super Contributor
timestamp: July 13, 2016, 02:31:42 pm
content: The behaviour of the VCO below 1.1V is undefined. It depends on how the VCO is implemented. On some ics the frequency keeps decreasing or saturates at a low value, on others the VCO stops completely if you go below a certain voltage. Every manufacturer makes the VCO a bit different outside the guaranteed operating range.
Anyone used an FPF2701 ?  Having issues... - Page 1
Forum section: electronics / projects

author: bill.coghill
author_rank: Contributor
timestamp: September 08, 2017, 04:07:00 am
content: I've been working on a project on and off for a while and finally got to the breadboarding stage.I chose the FPF2701 as a switching component and thoughts it's eFuse functionality would come in handy.It has a pin where you can use a resistor to set a trip current. Issue I am having is that I cannot make it trip when I draw more (like double) than the set limit current. If I put a dead short on the output it will trip correctly, but then tries to restart every couple of hundreds of ms.I was expecting the output to latch off as per the data sheet and need to have the output enable pin cycled to bring it back.It's almost like it's a FPF2700 rather than the 2701 which will attempt to reconnect the load after a timeout if it trips. I checked the parts are correct (it wouldn't be the first time digikey have shipped a slightly different part!), but they are definitely FPF2701s.I'm going to try another sample in case I damaged this one while mounting it on the Adafruit SOIC adaptor board.Just wondering if anyone has any experience with these units and confirm they do 'trip out' as expected.I also looked at using AUIR3315 for a similar role, but the FPF will run correctly at 5v and was more than half the price.Data sheet and info :http://www.onsemi.com/PowerSolutions/product.do?id=FPF2701Thanks,Bill
Anyone used mosfet RDS as current sense ? - Page 1
Forum section: electronics / projects

author: station240
author_rank: Unknown
timestamp: May 04, 2016, 09:49:22 pm
content: Was looking at a design that uses the LTC1871, and uses the Mosfet as a current sense. That is measure the voltage drop across the mosfet source and drain as if it were a current sense resistor.This is not something I've seen elsewhere, anyone used this idea in their own designs ?What sort of things should be considered, besides careful selection of mosfet RDS (on resistance) ?

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: May 04, 2016, 09:57:37 pm
content: I would assume something like this is used in self protected drivers for current limitation/sensing. It's most probably not very accurate though compared to a shunt resistor.

author: danadak
author_rank: Super Contributor
timestamp: May 04, 2016, 10:21:36 pm
content: Contact manufacturer but device to device Rdson variation probably exceeds50%. So if you are looking for absolute accuracy in readings then either youprovide a cal cycle or relay on sense R of your choosing.There is a method in manufacturing you can turn a poor sensor into high precision,see attached.Regards, Dana.

author: nctnico
author_rank: Super Contributor
timestamp: May 05, 2016, 12:31:43 am
content: I have used RDSon current sensing in various designs. As long as you keep in mind it is used to sense inducator saturation where the current will exceed the limit a lot you'll be fine. When designing assume the RDSon to be at least 3 times higher than specified.

author: zlymex
author_rank: Frequent Contributor
timestamp: May 05, 2016, 02:58:30 am
content: I use RDS as variable over current sense(10A to 500A) in my portable battery protection circuit. It will be too bulky to use a current shunt for 500A. I don't need that precision.

author: Skimask
author_rank: Super Contributor
timestamp: May 05, 2016, 03:52:18 am
content: Quote from: station240 on May 04, 2016, 09:49:22 pmLast night I figured out that the TP4056 PCBs I've been using to charge single 18650 Li-Ion cells use the DW01 for overcharge/overdischarge/overcurrent protection, and that board uses R(ds) to trip the overcurrent shutdown. At least I think it does...either that or I'm talking out my ass...Example:http://www.ebay.com/itm/10PCS-5V-Micro-USB-1A-18650-Lithium-Battery-Charging-Board-Charger-Module-/201039030988?hash=item2ecedc2acc:g:zHgAAOSw1vlUxZ0Q

author: station240
author_rank: Unknown
timestamp: May 05, 2016, 08:50:00 am
content: Quote from: blueskull on May 05, 2016, 03:20:02 amThe circuit calls the current sense resistor I wish to remove IMax, description calls it input current sense.Does seem like an overload detection, or to sense inductor saturation.There is a second current sense resistor that senses the output current.

author: Miyuki
author_rank: Frequent Contributor
timestamp: May 05, 2016, 11:32:58 am
content: And what to use HEXSense ? Or are they already deprecated now ?
Anyone used the bq77908a? - Page 1
Forum section: electronics / projects

author: Things
author_rank: Regular Contributor
timestamp: December 31, 2012, 12:16:32 pm
content: Hey guys, I'm looking to use this neat chip from TI in my electric scooter project. I have read through the datasheet many times, however after every time I read through, it always seems there's something else I need to add to the circuit, even though it's missing in the typical application circuit.So, these typical application circuits, is it some sort of requirement they'll work fine as displayed?I'm wondering if anyone here has done a design around this chip, and whether you could have a s quiz to see if I'm on the right track here.Apologies if the diagram is a bit ugly, I have this habit of just bodging components in, then cleaning it all up later once I know I don't have to move stuffJust don't want a huge fireball the second I plug this in!Cheers,Dan

author: rsjsouza
author_rank: Super Contributor
timestamp: January 01, 2013, 12:37:12 pm
content: Quote from: Things on December 31, 2012, 12:16:32 pmAlthough I am not familiar with this part, usually a datasheet contains one or several example applications and circuits that were used to perform the device's characterization - they sometimes come in different levels of detail and completeness, which may highlight certain parts of the circuit required to implement different topologies (this is true across several manufacturers).However, with this particular device I think you will have a lot of extra information by also reading itsEVM User's Guide- this guide is about an actual working board that is commercially available, therefore it definitely works.

author: Things
author_rank: Regular Contributor
timestamp: January 02, 2013, 09:30:04 am
content: Yeah, I've kind of been using the EVM as a reference as to what parts I really need, and it seems even for basic (safe) operation, the typ application diagrams are lacking quite a bit. On the flipside, the EVM is also over complicated in order to demonstrate all it's featuresAnyway, what I have should be fine after checking over it a few more times. Will know for sure once it's built and power connected I guess
Anyone used the STMicro ISM330/ASM330 line of IMU chips? - Page 1
Forum section: electronics / projects

author: IDEngineer
author_rank: Super Contributor
timestamp: September 12, 2024, 07:31:20 pm
content: We're running out of our stock of Bosch Sensortec BMI160's so we need to update our products with a new IMU part. The latest Bosch parts require you to download their operational firmware at every poweron, which would consume most or all of a microcontroller's flash memory. I personally have had terrible experience with some earlier STMicro IMU's but they've kept at it so I'm willing to give them another try.One thing I've openly and bitterly complained about in the IMU space is how rapidly the parts are retired. You can still buy 7400 series TTL DIP parts, but it seems most IMU's are retired after 18-24 months. Pin compatibility is usually possible, but the firmware interface is usually completely new and different which forces an expensive design refresh.To their credit, then, STMicro is promising10 and 15 year longevityfor the ISM330 and ASM330 series:...which REALLY gets my attention. (Source:https://www.st.com/en/mems-and-sensors/inemo-inertial-modules.html)If the parts function properly this could really resolve a lot of the issues we've suffered with past MEMS devices.Has anyone here used these parts? Any experience to share? It appears some of the product line has been around since 2023 so I'm hoping we're not the first ones to consider these parts.Thanks!

author: IDEngineer
author_rank: Super Contributor
timestamp: September 17, 2024, 10:17:08 pm
content: Hmm... crickets. Not sure how to interpret that.