hybridfree/eevblog-posts huggingface dataset:
Alternative to Amphenol 2M801-007-16M9-210PA? - Page 1
Forum section: electronics / general

author: zaphod_b
author_rank: Newbie
timestamp: October 13, 2023, 01:55:54 pm
content: For a test project I urgently need a more affordable alternative (can be hacky) to an Amphenol 2M801-007-16M9-210PA plug.As MIL-SPEC connectors are not my field of expertise I am a little lost to find a pin-compatible alternative.Is there an industrial series that is physically compatible with the 2M801 series?Any guidance is highly appreciated!Thanks!
EPROM access time vs temperature - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: October 12, 2023, 05:41:45 am
content: Made a couple of boards using cheap Chinese counterfeit EPROMs and some of them work just fine, others run for a bit then start acting silly. At first I had to fiddle the software to allow enough time between addressing and reading the data because these EPROMs are pretty slow. Labeled as 100nS but probably several times that figure. Question is - If the required setup time is just okay when cold, does it get longer when hot? It's easy peasy to allow for it, just want to know if I'm on the right track.
psu problem - Page 1
Forum section: electronics / general

author: p.larner
author_rank: Frequent Contributor
timestamp: October 10, 2023, 05:25:43 pm
content: HI,i have a transfo with a tap giving 37v raw ac,once rectified and smoothed i guess it will be about 40+v,is there any regulator ic that can take that voltage?,i need something like a lm723 but good for say a 50v input not the 723's 37v max,any ideas what i can use?,i want to build a 40+v bench psu with it.

author: TimFox
author_rank: Super Contributor
timestamp: October 10, 2023, 09:07:58 pm
content: To start: 37 V rms from a transformer will give more than 50 V after a bridge rectifier and unloaded filter capacitor.Also, if the 37 V is specified at a given load current, the voltage will be even higher with no load.You could use a 723 in a floating circuit, with a higher-voltage pass transistor.E.g.,https://www.circuitstoday.com/floating-regulator

author: p.larner
author_rank: Frequent Contributor
timestamp: October 11, 2023, 04:39:43 am
content: on the schematic on the linked page,can a 27v zenner be used as i have some 27v half watt ones,if so will max output be 27v?.

author: rdl
author_rank: Super Contributor
timestamp: October 11, 2023, 06:18:00 am
content: There's a high voltage version of the LM317 available that will handle up to 60 volts input-output differential.

author: mariush
author_rank: Super Contributor
timestamp: October 11, 2023, 06:38:01 am
content: peak dc voltage will be sqrt(2) x AC Voltage - 2 times voltage drop on diode inside bridge rectifierIn your case, around V dc peak = 1.414 x 37 - ~1.6 = ~50v - you'll want to use 63v or even 75v rated electrolytic capacitorsLM317HV can do 60v :https://www.digikey.com/en/products/detail/texas-instruments/LM317HVT-NOPB/212662Note that you won't be able to do much of a bench power supply with just a linear regulator, because linear regulators work by dissipating the difference between input voltage and output voltage as heat and a to-220 regulator on a very good heatsink can dissipate maybe 10-20 watts.So for example if you want 5v output and 100mA, you're already producing (50v - 5v ) x 0.1A = 4.5 watts as heat.You may want to get a switching regulator to produce around 5v higher than desired, then use a linear regulator to output the exact voltage.If you want to keep it fully linear, usually it's done by using transformers with multiple secondary windings and using relays to connect windings together for higher voltage.
Removing the protective varnish from the PCB - Page 1
Forum section: electronics / general

author: frantisek
author_rank: Regular Contributor
timestamp: September 15, 2021, 01:25:06 pm
content: Can anyone please advise how to remove about epoxy protective varnish from PCBs of Russian measuring instruments? Thanks!

author: magic
author_rank: Super Contributor
timestamp: September 15, 2021, 07:11:49 pm
content: Ordinary soldermask or conformal coating? Neither is very easy tbh.What are you trying to achieve?

author: ogden
author_rank: Super Contributor
timestamp: September 15, 2021, 08:33:35 pm
content: Further reading:https://www.vaniman.com/ultimate-conformal-coating-removal-guide/. In short: epoxy conformal coating is worst case, you need set of preheating + ESD-safe microblasting equipment, right consumables.

author: frantisek
author_rank: Regular Contributor
timestamp: October 04, 2023, 04:33:32 pm
content: Now I know how to do it without preheating!!

author: p.larner
author_rank: Frequent Contributor
timestamp: October 10, 2023, 12:40:48 pm
content: paint stripper works well+ a brush under hot running water .
Hackaday Podcast on Karcher 7000i Internet Radio - Page 1
Forum section: electronics / general

author: PinheadBE
author_rank: Regular Contributor
timestamp: October 10, 2023, 11:47:41 am
content: Hi,I have that great DAB+/FM/BT/Web Radio which includes also a Podcast function.It works great, I can access literally thousands of podcasts, web radios.....But I do not know why, despite the broad diffusion of the Hackaday Podcast on several platforms, I cannot find it with my radio.I already asked the Karcher customer service, without any response.Is there someone out there having the same radio that could help me ?Thanks
Electronics Markets /  General Geekery in Japan ??? - Page 1
Forum section: electronics / general

author: mrpackethead
author_rank: Super Contributor
timestamp: October 05, 2023, 11:09:57 pm
content: Hi All,I'm going to Japan for the first time ever, visiting Kyoto Osaka and Tokyo for 10 days, in a couple of weeks.. Wondering if anyone has any suggestions for places to go and visit in Japan for general electronics interest?I'm also in the market to buy a new laptop, but so far searches of the intertubes suggest its not really any cheaper than at home.Any suggestions?

author: Andy Chee
author_rank: Super Contributor
timestamp: October 06, 2023, 03:58:31 am
content: There's a Tokyo/Akihabara thread here:https://www.eevblog.com/forum/chat/the-akihabara-japan-electronics-store-master-list/msg4729406/#msg4729406Other than that, I'm also on the look out for other Japan suggestions!

author: VK3DRB
author_rank: Super Contributor
timestamp: October 09, 2023, 11:46:44 pm
content: The exciting days of the 70's and 80's in Akihabara and Nihonbashi are over. When I was there in the 80's and 90's they were awesome places. I revisited Akihabara about four years ago.I only found one ham radio shop, no electronics components shops, but plenty of manga shops and other rubbish that might be of no interest to those into electronics. A big disappointment.Maybe some in that list are worth finding... good luck.
Need instructions: how perform grounding & current leakage check on lab equipmet - Page 1
Forum section: electronics / general

author: jhottel
author_rank: Newbie
timestamp: October 08, 2023, 04:57:39 pm
content: Any biomedical\facilities laboratory employees out there?!I need to fulfill a College of America Pathologists (CAP) requirement for inspection and not sure how to do the two items mentioned below in the regulation. I would like instructions on how to check if an instrument is grounded and how to check for current leakage. I have a clamp meter with lead attachments I was told to use, just need some clear instructions and parameters. The exceptions below don't really apply to us as most of the equipment is not the two-pronged double insulated ones, plugged to a GFCI, and we have no 240v equipment. I did reach out to CAP for clarification and they had no instructions. We are a small lab and want to do this ourselves. Thanks for any advice.CAP requirement GEN.75900 Electrical GroundingThere are records that all laboratory instruments and appliances are adequately grounded and checked for current leakage before initial use, after repair or modification, and when a problem is suspected.NOTE: Exceptions to these requirements are as follows: 1. Devices protected by an approved system of double insulation or its equivalent. Such devices must be distinctively marked 2. Devices connected to wall receptacles or circuit breakers with ground-fault circuit interrupter (GCFI) protection built-in need not be checked for current leakage. GCFI interrupters must be utilized in areas where water may pose an added risk. 3. Equipment operating at 240 v must be checked for ground integrity only Verification of electrical safety is required whenever the electrical/electronic systems of a powered device has been removed or altered. Hospital laboratories may follow ground checks and current leakage checks as performed in patient locations.In addition, the US Occupational Safety and Health Administration (OSHA) requires that power cords of portable electrical equipment be visually inspected for external defects whenever relocated. Grounding configurations may not be bypassed by, for example, an adapter that interrupts the continuity of the grounding. If manufacturer's recommendations for grounding are available, they must be followed.REFERENCES 1) Occupational Safety and Health Administration. Electrical. Use of equipment. US Government Printing Office, 1999(Jul 1): [29CFR1910.334]

author: TimFox
author_rank: Super Contributor
timestamp: October 08, 2023, 05:06:34 pm
content: A general reference:https://www.fluke.com/en-us/learn/blog/clamps/leakage-current-measurement-basicsA list of available test equipment:https://www.medicalexpo.com/medical-manufacturer/leakage-current-tester-49053.html
Apple "AirTag" as redundancy for lost/crashed drone - Page 1
Forum section: electronics / general

author: lezginka_kabardinka
author_rank: Regular Contributor
timestamp: October 05, 2023, 12:23:48 am
content: Had idea - "affix AirTag to drone" - suggested to friend (reductive reasoning to me, not science for rocket!) - friend on FaceTime laugh to me, says to me "My insurance replaces it" - I say "Your insurance doesn't replace all your footage, doesn't it!" - friend reply "DJI will replace it, and app say last known location"Friend have "answer" for everything, so I Google it (hung up on him, as telling me I am idiot, and "DJI service never goes offline")- Google kinda agrees, on my side, people do this.Any person thinks as I?

author: ebastler
author_rank: Super Contributor
timestamp: October 05, 2023, 12:07:51 pm
content: Depends where you intend to fly your drone. If it crashes in a remote location where no people with Apple phones walk past it, your AirTag will not help.

author: tom66
author_rank: Super Contributor
timestamp: October 05, 2023, 01:07:06 pm
content: AirTags only work when in range of iDevices. If you crash your drone in the middle of nowhere, you'll never find it, because unless a hiker (with an iPhone, with a data connection) walks past it, it'll never be pinged.Also, as I discovered, they're not that rugged. One of my stopped working after a 1.5m drop onto concrete, even with the battery replaced. So I could imagine a drone crash could break it.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: October 05, 2023, 08:33:11 pm
content: Quote from: ebastler on October 05, 2023, 12:07:51 pmApple ID and FindMy location tracking may not be reliable in the Russian Federation anymore. Due to the 'special war', state officials and employees are banned from using Apple products including iPhones. So you may have to wait a long time to find your beloved drone, even if goes down over Red Square.
Free Sams Photofacts Schematics & Service Manuals Form Your Public Library.  - Page 1
Forum section: electronics / general

author: KG7AMV
author_rank: Frequent Contributor
timestamp: October 05, 2023, 03:16:49 am
content: I did this video a while ago It is a great Resource for Older Schematics and Service Manuals.Also the Volusia County Florida Public Library Page Post a Username and Password for the Public to use so if you don't have a local library with a sams subscription there is a way.Volusia County Florida Public Library Link is in the video description.
What does it take to design a good high voltage differential probe like TDP1000 - Page 1
Forum section: electronics / general

author: opa627bm
author_rank: Regular Contributor
timestamp: October 05, 2023, 02:35:42 am
content: Hi all,I been looking around for probes from Keysight , Lecory ..etc and I can't find a diff probe from them have the same or better spec as a TDP1000 from Tektronix. I know the probe amplifier ASIC is a custom build from 1995 and still being used today, but what does it take build one from modern off the shelf components? Most of the diff probe browser are very bulky compared to TDP1000 too. Wonder why things hasnt been improved after so many years.Regards,Li

author: Someone
author_rank: Super Contributor
timestamp: October 05, 2023, 02:52:58 am
content: They call it high voltage, but its really not.Differential mode input voltage: ±42 v (DC + pk AC); 30 VrmsMaximum input voltage (nondestruct): ±100 V (DC + pk AC)See the problems people have on this forum trying to do x00MHz single ended, then add high impedance, then add differential. Rather expensive to engineer and uses expensive parts.But most of the reason is the low volume and they don't invest in a highly automated assembly line for it. Order a few 100' thousands of them and watch the price come right down.
The way things used to be. - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: October 03, 2023, 11:54:50 am
content: Was looking through some old files, and found these oldies, a reminder of the first PCB set I made. Done with home etched boards, and toner transfer, using an electric clothes iron to do the transfer from the overhead transparency sheet to the PCB material. Still got the PCB drill I used, along with the loads of tiny fragile drill bits that you used to make the holes, and hoping you would not break all those fragile drill bits before you ran out of bits, with holes still left to do.Pre CAD, and I did the originals on graph paper, reversed so the lines were faintly visible, but would not copy through, and then with some permanent marker pens to do corrections.

author: soldar
author_rank: Super Contributor
timestamp: October 03, 2023, 06:45:17 pm
content: if it was a one-off I often drew it directly by hand with a water-resistant marker pen; if I expected to do more than one I most often used the UV photo-sensitive system.What a pain!

author: tggzzz
author_rank: Super Contributor
timestamp: October 04, 2023, 04:53:56 am
content: Quote from: SeanB on October 03, 2023, 11:54:50 amFor older techniques I used, seehttps://entertaininghacks.wordpress.com/2015/02/21/a-40-year-old-hack-disinterred/Professionals used rubylith red and blue tape.https://www.microwaves101.com/encyclopedias/rubylith

author: Brumby
author_rank: Unknown
timestamp: October 04, 2023, 05:09:25 am
content: Dalo pen.Ugly, but it worked.

author: Berni
author_rank: Super Contributor
timestamp: October 04, 2023, 05:15:35 am
content: I was doing the UV process instead because i didn't have a laser printer.Sure don't miss those days. The mess from all the chemicals and that irritating FR4 dust from drilling. Even used ferric chloride at first.

author: Brumby
author_rank: Unknown
timestamp: October 04, 2023, 05:48:11 am
content: In my day, ferric chloride was the only etchant I knew.

author: rdl
author_rank: Super Contributor
timestamp: October 04, 2023, 06:13:16 am
content: I made these boards when I first got interested in electronics using rub-on transfers from Radio Shack and ferric chloride to etch. I mostly just wanted to see how hard it was. It was very time consuming to lay down the traces, so I didn't make too many more after these. I powered them up not too many years ago and they still worked.

author: SeanB
author_rank: Super Contributor
timestamp: October 04, 2023, 05:43:36 pm
content: Got to dig up the timer i did to handle phone calls, as you really needed to be careful on phone calls in the old days when trunk calls were expensive. I soldered the batteries in, and when i last pressed power a year or three ago it still worked, and the batteries had not leaked either.

author: tggzzz
author_rank: Super Contributor
timestamp: October 04, 2023, 08:22:28 pm
content: Quote from: Brumby on October 04, 2023, 05:09:25 amNo, the effing things didn't, for.me.at least.Hence my inventing techniques that did work and could be used for DIL ics.
Need help to identify a transistor Texas Instrument  - Page 1
Forum section: electronics / general

author: Andbro
author_rank: Regular Contributor
timestamp: October 04, 2023, 04:02:28 pm
content: Hi,I found nothing about this part. Do you can help me please ?

author: SeanB
author_rank: Super Contributor
timestamp: October 04, 2023, 06:19:14 pm
content: House coded part, so pretty hard to identify. Likely though it is a bipolar transistor, as TI was a big producer of them in the 1970's, so you just check NPN or PNP, with the pins being, left to right, base collector emitter as most common. Gain probably around the 30 to 110 mark, and current likely around 5A, voltage rating anything from 30V to 200V, common in the TI range. Getting a replacement is going to need more information, machine it is in, and some idea of the voltages there. Could also be a darlington, with gain from 100 to 1000, and there are a few SCR and TRIAC models in the same package style.
Can you name this top insert side screw PCB terminal found on Sonoff panels? - Page 1
Forum section: electronics / general

author: tomayr
author_rank: Newbie
timestamp: October 03, 2023, 12:09:52 pm
content: They are found in Sonoff NSpanel boxes on the relay board. PCB mount. Side screw.I can't seem to find it for the life of me.

author: spostma
author_rank: Regular Contributor
timestamp: October 03, 2023, 08:17:12 pm
content: not exactly the one you look for, but it looks like a single contact of a vertical entry terminal block likehttps://www.metz-connect.com/externalfiles/311631/863662.PDFBy the way, this horizontal single contact block with 3.1mm hole, M3 screw and double mouting pin can be used for many mechanical mounting solutions:https://www.metz-connect.com/home/products/u-contact/pc-board-terminal-blocks/screw-type-terminal-blocks.7f.en.html?id=360410

author: ZigmundRat
author_rank: Regular Contributor
timestamp: October 03, 2023, 08:27:05 pm
content: Not quite right, but fairly close:https://lugsdirect.com/IHI_HIGH_CURRENT_PCB-TERMINALS-_SELECTION_CHART2.htmOr maybe:https://www.metz-connect.com/home/products/u-contact/pc-board-terminal-blocks/screw-type-terminal-blocks.7f.en.html

author: tomayr
author_rank: Newbie
timestamp: October 03, 2023, 09:57:06 pm
content: Thank you for the responses so far.It's odd that it wouldn't be a more readily available item. I scoured all of Metz's brochures and website as they seemed to be the most likely to manufacturer such a piece. I can't imagine its unique to Sonoff?
Mind Blowing Welding in Super Slow Motion - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: October 02, 2023, 03:28:12 am
content: See welding through new eyes:

author: globoy
author_rank: Frequent Contributor
timestamp: October 03, 2023, 04:43:07 pm
content: That was great. Thanks for posting.

author: langwadt
author_rank: Super Contributor
timestamp: October 03, 2023, 05:01:19 pm
content: here's MIG spray transfer instead of short circuit,https://youtu.be/WNRBSUNvFEs?si=PvOFLWRbOjefT8Hd

author: soldar
author_rank: Super Contributor
timestamp: October 03, 2023, 05:48:20 pm
content: I do stick welding ... very badly. I wish I could see what I am doing. Most of the time it takes me too long after the arc strikes to focus and get my bearings and by then I've already burnt a hole right through the work.

author: BrokenYugo
author_rank: Super Contributor
timestamp: October 03, 2023, 06:59:41 pm
content: Quote from: soldar on October 03, 2023, 05:48:20 pmIf you don't have an auto darkening helmet get one, I find being able to quickly adjust the shade level means I can see everything and get on track quickly.

author: langwadt
author_rank: Super Contributor
timestamp: October 03, 2023, 08:23:19 pm
content: Quote from: BrokenYugo on October 03, 2023, 06:59:41 pmand check if you do (or don't) need glasses. I'm getting old I need my glasses of for close up work, make a world of difference when you can actually see what you are doing

author: soldar
author_rank: Super Contributor
timestamp: October 03, 2023, 08:42:31 pm
content: Quote from: BrokenYugo on October 03, 2023, 06:59:41 pmI have one. I think I need much more practice and not just do a weld here and there every few months. The auto-darkening helmet seems to not work very well so I have gone back to regular shades. I think it may be that the first may need to charge some battery or capacitor first and I just have it in a dark corner in the garage. I have thought that maybe next time, before welding, I should leave it out in the sun for a while and see if that fixes the problem. but I am always in a hurry so I just use the old helmet.I should play with the helmet and with the welding.

author: soldar
author_rank: Super Contributor
timestamp: October 03, 2023, 08:46:51 pm
content: Quote from: langwadt on October 03, 2023, 08:23:19 pmThat is also part of the problem. When I was younger I could focus my eyes on the work but now I need to move my head back and forth until the work is in focus.It just takes a second for me to focus and get my bearings but a second is more than enough to burn a hole through thin metal.I wish I could work on really thick work with a nice puddle, like in the video, and plenty of time to enjoy the progress.
Functional Safety Certification - Page 1
Forum section: electronics / general

author: Blackgar
author_rank: Contributor
timestamp: October 03, 2023, 03:35:42 pm
content: I have been working as an engineer in automotive projects for several years and I have a relevant experience with ISO26262.The company I work for, offered me to choose one certification program for ISO26262 in which I would like to be exanimated and receive the certification.I searched the internet and it seems that the two most preferred certifications are from TUV SUV and TUV SGS.Does anyone have experience with such kind of certifications?
Please recommend me an Anti-bluelight screen film that is not a BS. - Page 1
Forum section: electronics / general

author: hap2001
author_rank: Regular Contributor
timestamp: October 07, 2023, 06:23:41 am
content: Hi friends.I feel much better using a screen with warm color temperature. But not all screens can be tweaked by firmware/software.Almost all "Anti-bluelight screen protectors" are just scams, they don't even look yellow.And I don't want those glass type because I want to be able to cut them.Currently I'm using Rosco lighting filters, but they have glossy surface instead of matte, so they are too reflective in bright environments.I guess maybe there are some good brands I missed, so I'm here to listen to you guys.Thanks!

author: jonpaul
author_rank: Super Contributor
timestamp: October 07, 2023, 11:01:52 am
content: see your eye doctor.Get tinted yellow lenses/sunglasses.j
MS partners to make robots full of GPT - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 05, 2023, 09:46:31 pm
content: https://www.therobotreport.com/doosan-microsoft-plan-to-build-gpt-based-robots/Be very afraid.

author: DimitriP
author_rank: Super Contributor
timestamp: September 05, 2023, 10:05:48 pm
content: Doosan.Figuring out who-is-who and what-is-what gets confusing sometimes:https://www.heavyquipmag.com/2023/01/21/doosan-changes-its-brand-name-from-now-it-will-be-known-as-develon/but wait:Are Daewoo and Doosan the same?Doosan Infracore is a South Korean company, the former Daewoo Heavy Industries & Machinery. Doosan acquired Daewoo Heavy Industries & Machinery and renamed as Doosan Infracore in April 2005.but wait some more:How much did Doosan buy Bobcat for?$4.9 billionDoosan Group acquired Bobcat from US-based industrial equipment company Ingersoll Rand in 2007 for $4.9 billion. It was the largest overseas acquisition at the time – one that pushed Doosan Group into debt. Doosan Bobcat's acquisition of the group's forklift business would create synergy in the construction sector.Feb 22, 2021

author: Neutrion
author_rank: Frequent Contributor
timestamp: September 30, 2023, 01:33:39 pm
content: Actually this is the thing which should be forbidden with AI. What we don't need are robots and generally AI with human-like understanding and sensing. A cleaner robot should not understand politics, or read my facial expressions. Actually non of the AIs should. A SW tool helping writing algorythm should not be able to listen to music or analize pictures. We are working hard to create something which will be the next step in the evolution and to create an even bigger chaos than what we are heading for at the moment even without this shit.

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 30, 2023, 09:11:59 pm
content: Quote from: Neutrion on September 30, 2023, 01:33:39 pmPretty much so.
What is responsible for a drone or ESC's startup jingle? - Page 1
Forum section: electronics / general

author: MarkMLl
author_rank: Frequent Contributor
timestamp: September 29, 2023, 08:13:43 am
content: This videohttps://youtu.be/3sb7GCFheK4?t=305(at 05:05 from the start) has something playing a distinctive startup jingle, which in its entirety is five notes. I suspect that this is from the "ODrive" board, which I believe controls ESC (Electronic Speed Control) boards.I hear the same jingle from various cheap drones on YouTube etc., even if their (proprietary) firmware doesn't acknowledge ODrive as a component. For exampleWhere is this coming from? The ESCs themselves don't appear to have the smarts to store a jingle, so is this a characteristic of a PixHawk derivative, of Ardupilot, or basically... what?MarkMLl

author: Psi
author_rank: Super Contributor
timestamp: September 29, 2023, 08:25:49 am
content: Dunno who came up with it, probably someone in china.but some ECSs will play the tune, then beep a number of times to indicate what battery was detected based on voltage. eg 3 beeps for 3S

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 29, 2023, 10:35:45 am
content: The ESC definitely has the smarts to run a jingle, they wiggle the motor to make the tones. Like how they make floppy drive music.

author: MarkMLl
author_rank: Frequent Contributor
timestamp: September 29, 2023, 11:20:09 am
content: The photos athttps://fccid.io/2AG45-XT200/Internal-Photos/Internal-Photos-3411203.htmlappear to confirm that the ESC boards in the drone I cited do have controller chips as well as FETs.So the big question here is whether ODrive originated this jingle, or borrowed it as "a good idea" from somebody else. In any event ODrivehttps://github.com/odriverobotics/ODriveappears to be MIT-licensed, so even if various drone manufacturers have used it without attribution they can't really be criticised: which would not be the case if they'd borrowed from Ardupilot (GPL) or PX4 (BSD), hence my question.MarkMLl

author: Psi
author_rank: Super Contributor
timestamp: September 29, 2023, 11:40:02 am
content: Most china ESCs are based on either ATMega or STM32 mcus.

author: tom66
author_rank: Super Contributor
timestamp: September 29, 2023, 01:16:02 pm
content: I used to fly model aircraft, I have some ESCs way back from 2011 or so which did this. So it's been around for a long time.If I recall correctly it's implemented by just driving 2 out of the 3 phases so the motor doesn't commutate. You don't normally notice the motor whine when a prop is attached on account of the prop making a lot more noise.Even the prosumer DJI drones do the same thing with their motors, they don't have beepers built in, signals all sorts of things like ready to fly.

author: MarkMLl
author_rank: Frequent Contributor
timestamp: September 29, 2023, 01:23:01 pm
content: Thanks for that Tom. Yes, I noticed DJI's fancy tunes etc. when I went looking after seeing the NERF-gun video with the standard jingle.MarkMLl
ST fiber heads - Page 1
Forum section: electronics / general

author: thedoc298
author_rank: Contributor
timestamp: September 29, 2023, 03:09:36 am
content: Not sure what they are called....HFBR-2412TZ , but the question is I see many fiber things With the number HFBR-2412TZ and on the same device I see like rx 1124, rx1120 and so on. I know what the HFBR-2412TZ means, as it is a receiver, but I can't find anything on the other number. Even when looking to buy on ebay, they are many rx numbers. I have looked for a couple of hours trying to something educational.
1980s Atari arcade Vector graphics Text generator draw diagram? - Page 1
Forum section: electronics / general

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: September 28, 2023, 12:27:22 pm
content: I swear I could recall seeing it. A diagram of the "Font" of a Vector graphics text generator, With arrows showing the draw order, which lines are drawn first and in which direction.But I can't find it anywhere, I just get images from a coloring book.Does anyone know where I can find that text drawing diagram?
About Multimeter - Page 1
Forum section: electronics / general

author: sanour_islam
author_rank: Newbie
timestamp: September 28, 2023, 10:05:29 am
content: I have an uni-t ut61E+. I used it a lot. I have a question.The uni-t ut61E+ need 4.5-6V. I want to use a 3.7V battery to run the multimeter with a booster module and make it 6V. Every Booster module have higher frequency and ripple. Is there any problem?
abonded steam engine bough back to life - Page 1
Forum section: electronics / general

author: aqarwaen
author_rank: Regular Contributor
timestamp: September 27, 2023, 07:46:17 pm
content: i beat some mechanical enginers in here would love watch this.it goes pretty deep explaning how it works.enjoy 😉https://youtu.be/nBImv1mlcMg?si=x7pCfih_efLHmBM5
Anyone in Australia with ability to read/write an Intel P8049AH? - Page 1
Forum section: electronics / general

author: RichardM
author_rank: Frequent Contributor
timestamp: September 27, 2023, 03:40:58 am
content: Hi,I am trying to repair a R&S SMS signal generator and suspect the microcontroller had been replaced. It is a P8049AH that has a mask rom that would normally contain the software needed for the unit to function. If, as I suspect, the P8049 has been replaced with no mask rom code then the unit has no hope of working. I have several programmers but nothing that can read a P8049AH. I would be happy to post it to anyone in Australia to check for me if anyone is willingCheersRichard

author: Ian.M
author_rank: Super Contributor
timestamp: September 27, 2023, 04:06:35 am
content: Method of dumping 8049 ROM (not EPROM) using Arduino:http://qemulator.blogspot.com/2020/05/dumping-intel-8049-roms.html

author: RichardM
author_rank: Frequent Contributor
timestamp: September 27, 2023, 08:46:24 am
content: Thanks Ian. I have this page and another option of making an adapter for my GQ4x4 programmer as backups. Was hoping someone was already setup and willing. Cheers.
Bluetooth Extenders - Page 1
Forum section: electronics / general

author: BILLPOD
author_rank: Frequent Contributor
timestamp: September 25, 2023, 07:40:25 pm
content: Good Morning All, I have a DMM with Bluetooth capabilities and I'm monitoring some battery voltages in the basement. I'm trying to read the voltages on my tablet in a room on the 1st floor, but the bluetooth signal keeps dropping out. The in-line distance is only about 20 ft. with one floor and one wall in-between, (both wood/plasterboard). There are bluetooth range extenders on the market and they are all pricey. I would bite the bullet, but am wondering if anyone here has any positive experience with any of them.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 26, 2023, 12:13:24 pm
content: Find an old satellite dish and put the meter where the LNB is mounted, then aim it upstairs.

author: thm_w
author_rank: Super Contributor
timestamp: September 26, 2023, 09:33:12 pm
content: Bluetooth to wifi gateways are cheap, but they are proprietary to specific manufacturers devices. You could have an old android phone connected to the device, then connect to the phone, etc.Though the money is probably better spent on an equivalent wifi volt measuring device, or DMM with ethernet port, if the satellite idea does not work (you can try a baking pan or bowl or something as well).
LED driver current sense cant find resistor - Page 1
Forum section: electronics / general

author: smile
author_rank: Regular Contributor
timestamp: September 23, 2023, 12:22:36 pm
content: Hello,I have LED flood light, the driver is BP3319MBData sheethttps://www.alldatasheet.com/datasheet-pdf/pdf/1141562/BPS/BP3319MB.htmlThere is CS pin to set current level.However in my PCB there are more then one resitor connected to CS pin. So I cant find it. help.Copy paste image URL to see full size version.

author: RJSV
author_rank: Super Contributor
timestamp: September 24, 2023, 03:53:21 am
content: Wild Guess; (before I go read the spec).I'm thinking that could be SEVERAL separate resistor loads, for controlling one at a time.Such as for selection between Dim, Medium, and Bright. In that case you would likely observe a separate surface mount transistor for each resistor,...with only one of them selected at a time.Maybe try (power off) measure the resistances; my guess would be something like:(R1) at 500 ohm (dim)(R2) at 330 ohm (medium)(R3) at 100 ohm ((brightest)

author: MarkS
author_rank: Unknown
timestamp: September 24, 2023, 01:59:55 pm
content: Quote from: RJSV on September 24, 2023, 03:53:21 amIf you trace the circuit, it consists of R1, R2, R13, R14, R15, R16 and D2 and seems to be connected back to the IC through R13. I understand smile's confusion!

author: smile
author_rank: Regular Contributor
timestamp: September 25, 2023, 11:59:08 am
content: QuoteThe light has only one mode, not 3. So Why all the resitors?Here is the other side of PCB

author: MarkS
author_rank: Unknown
timestamp: September 25, 2023, 03:20:17 pm
content: I wish I could help, but that circuit makes zero sense! I'm waiting for someone to come along and explain it myself.

author: TimNJ
author_rank: Super Contributor
timestamp: September 27, 2023, 02:06:05 am
content: R1 and R2 are the current sense resistors. 1.6ohm and 620mOhm in parallel. Of course, they need to be relatively low value. They are split presumably to spread power dissipation and to trim/fine tune the current.R16 is 1K in series with the CS pin, presumably helps protect the pin from spikes/surges.R15 is a 10K gentle pull down across gate source of the MOSFET to try to prevent the MOSFET from turning on when it should not be.R13, R14, D2 are the gate drive components.
RC Remote ID transmit module for ID'ng Quadcopters and more over 4G-5G etc net. - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: September 24, 2023, 03:43:50 pm
content: https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-89https://www.faa.gov/uas/getting_started/remote_id/Remote-ID-Toolkit-main.pdf

author: mendip_discovery
author_rank: Super Contributor
timestamp: September 24, 2023, 04:32:57 pm
content: All aircraft are expected to have a transponder to help identify then. With the idea of home delivery bots etc it our airspace may become busier.Plus plenty of idiots have taken up the hobby and have been a bit stupid so forcing more regulation.
Brymen Firmware Update - Page 1
Forum section: electronics / general

author: Mark65
author_rank: Newbie
timestamp: September 22, 2023, 09:19:00 am
content: Hi All,After stalking the forums for a while (year or two) I thought I would join, I have a Brymen BM789 on Rev 6 firmware and am trying to find out how to update it, is it possible, I assumed it may be similar to the Fluke range but cant find anything.I've mailed Telonic who I bought it from to see if they do it and the cost, Ive had it it over a year now for use around the house, car and motorcycle and for my use I have no problems but still like to keep things up to date.I was looking at the 869s to add to it just for well no reason, I don't drink or smoke and like to spend my money on decent kit even if it only gets used once and a while, I was looking for a fluke that was the same spec as the 869s but they coming in at crazy money.Anyway hi to everyone and thanks for any advice.Mark

author: Veteran68
author_rank: Frequent Contributor
timestamp: September 22, 2023, 08:36:30 pm
content: Brymen typically doesn't provide end-user firmware support. They share the programmers and firmware updates to some of their resellers under NDA that aren't allowed to share them, only to service their own customers and keep their inventory updated. Dave has talked about this in his videos about the BM786. So I expect your only channel of support would be your dealer.

author: Mark65
author_rank: Newbie
timestamp: September 24, 2023, 02:34:40 pm
content: Thanks, yes the dealer can do it for me if needed free but will need to post as im not near them.
Solder Fume Extractor VS Window Hose Pipe Ventilation Fan  - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: September 23, 2023, 12:45:41 pm
content: why use a fan-forced activated carbon filtration unit whan a small ventilation fan, same vacuum cleaner hose pipe & window port will do.we have kitchen range hoods & wood stoves have chimney pipes. so why not just add a plexiglass sheetwith an air port into a window as you would a window air conditioner. my lab room is well-ventilated room as it is.so solder smoke is not a problem for the limited amount of soldering work I do.I still wonder why so many soldering stations are in unventilated rooms with no accessible window?requiring closed loop fan-forced carbon filtration units.

author: wraper
author_rank: Unknown
timestamp: September 23, 2023, 12:50:36 pm
content: Not a small fan, not a narrow vacuum cleaner hose and not everywhere you can put a window port without too much trouble.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 23, 2023, 01:04:00 pm
content: If the option is available, venting outside is a great choice. Put the fan on the remote end and the flex duct will substantially reduce the noise so that you can use a much more powerful one.
AC current sensor logoele brand relay buzzin when should be on - Page 1
Forum section: electronics / general

author: smile
author_rank: Regular Contributor
timestamp: September 21, 2023, 06:13:00 pm
content: Hello,Some years ago I bought this KIT of AC sensor to turn relay on when current flows.linkhttps://www.aliexpress.com/item/32811343304.html?pdp_npi=3%40dis%21USD%21US%20%2421.72%21US%20%2421.50%21%21%21%21%21%402101c67a16952958184065456e1642%2164497010017%21im%21%21Finally have put this together but the problem is the relay is buzzing (50hz or something) when it should just stay on.What can be the problem? I tried adjusting the trim pots but they do not adjust this. They one adjusts on/off thershold the other who knows what.

author: smile
author_rank: Regular Contributor
timestamp: September 21, 2023, 08:48:18 pm
content: Problem solved.You have to adjust the theshold pot without any load connected !Still waiting for reply from manufacturer about second pot.
Im looking for a load switch ic with button controller - Page 1
Forum section: electronics / general

author: iwasz
author_rank: Contributor
timestamp: September 26, 2023, 09:04:37 am
content: Dear all, I'm looking for a load switch IC with a button controller like this one :https://product.torexsemi.com/en/series/xc6192. Preferably available on LCSC and cheap. Another one I've found is SRC0 from ST, but it's expensive. I had hard time finding such ICs, as most load switches have momentary enable. I thought having something integrated will be easier to work with, but generally speaking I don't know how experts "usually implement" this soft switch feature? Shall I ditch the IC idea and implement soft latch from discrete parts like Dave did in one of his videos? Or maybe there are different approaches I could take? I know about at least 1 lipo charger (I have one in my design) that has this button aka on-off functionality as well. My requirements : on-off soft switch, easy, cheap, less than 10µA when off. Thanks.

author: ledtester
author_rank: Super Contributor
timestamp: September 26, 2023, 04:22:42 pm
content: Maybe build your own using a cheap microcontroller, e.g.:https://www.electronics-lab.com/project/attiny85-push-button-power-switching-software-solution/

author: Ian.M
author_rank: Super Contributor
timestamp: September 26, 2023, 05:04:49 pm
content: Also see the suggestions here:https://www.eevblog.com/forum/beginners/tactile-mom-switch-to-enable-ic/N.B. the CMOS inverters need to run at the battery voltage as you cant afford the quiescent current of a regulator. The suggested part is good for single LIPO or other power source under 6V. 4000 series CMOS is probably the best option for up to 4S Lipo packs and above that you are S.o.L.

author: iwasz
author_rank: Contributor
timestamp: September 27, 2023, 08:29:35 am
content: Thanks guys! That thread(s) Ian pasted is gold.
Future Electronics has gone South - Page 1
Forum section: electronics / general

author: Bud
author_rank: Super Contributor
timestamp: September 20, 2023, 09:09:15 pm
content: Future Electronics, a Canadian national distributor of electronic parts, was sold to a company in Taiwan.FE was not a match to DigiKey but had very good deals over them on some parts.Would be a shame to lose them.https://www.ept.ca/2023/09/auto-draft-4/

author: coppice
author_rank: Super Contributor
timestamp: September 20, 2023, 09:16:50 pm
content: I didn't know Future operated like DigiKey. My experience with them is as a competitor to Arrow and Avnet in the Asian market. Why would you expect to lose them now WT has bought them? Its true that WT is currently focussed on Asia, but there is no obvious reason they should make Future an Asia exclusive business going forwards.

author: thm_w
author_rank: Super Contributor
timestamp: September 20, 2023, 10:13:31 pm
content: Their warehouse is in USA anyway.Although $8 shipping to canada is not bad. I don't know when that changed, haven't used in ages.

author: peter-h
author_rank: Super Contributor
timestamp: September 21, 2023, 04:23:58 am
content: Future is a reasonable disti here in the UK.Much cheaper than say Digikey or Mouser - probably half. But that's normal for a manufacturing disti versus a hobbyist / low volume disti like Digikey or Mouser or RS or Farnell.Future staff know nothing about components so you can't ask for a 100k 1% 0805 resistor, but that's normal nowadays. I buy from Anglia if I want to talk to a human
California Right to Repair Passes Assebly 09/12/2023  - Page 1
Forum section: electronics / general

author: KG7AMV
author_rank: Frequent Contributor
timestamp: September 13, 2023, 12:38:45 am
content: Just in California Right to Repair Passes Assembly 09/12/2023 on to the Governor for a Signature.

author: jpanhalt
author_rank: Super Contributor
timestamp: September 13, 2023, 07:47:55 am
content: Here's a link to the actual bill:https://legiscan.com/CA/text/SB244/id/2832427How do you define "fair and reasonable" with regard to cost?

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 13, 2023, 09:33:42 pm
content: Yeah, now what?QuoteI'm curious as well.

author: tom66
author_rank: Super Contributor
timestamp: September 13, 2023, 09:51:48 pm
content: Quote from: jpanhalt on September 13, 2023, 07:47:55 amImpossible to define in law, but would end up in court if e.g. Apple were charging $200 for a battery and Samsung were charging $50. Those kinds of suits are expensive for companies to fight, they're going to avoid it if possible.

author: BeBuLamar
author_rank: Super Contributor
timestamp: September 19, 2023, 07:32:47 pm
content: When I called Fluke about a Fluke 116 DMM that failed during warranty period they told me to send it in for them to destroy it and then they send me a new one. So if the meter is out of warranty they do not repair it or sell any parts. Does this apply to the right to repair?? I don't think you should force manufacturers to sell parts or repair what they sell. However, I do have problem with the fact they prohibit you to modify their firmware code. If you buy something you should have the right to do anything to it.
Rich Rebuilds a flooded EV Maclaren gets a new battery!....eventually. - Page 1
Forum section: electronics / general

author: Haenk
author_rank: Super Contributor
timestamp: September 18, 2023, 03:14:55 pm
content: That P1 belongs to Tavarish.Rich has the knowledge to deal with these batteries though.Still doubt it's fixable, as the whole electronics part is corroded away from seawater, plus a little fire on top...
Bored at work - Let's make a scope music playback device! - Page 1
Forum section: electronics / general

author: DavidAlfa
author_rank: Super Contributor
timestamp: September 19, 2023, 06:07:34 pm
content: If you didn't know, the legend Jerobeam Fenderson made a new video few months back.Shouldn't be hard to make a playback thing with current tech. My idea is to fit a STM32 + USB storage + PCM5102(32bit, 384KHz) all together in a small box.Also I might get a healthier lifestyle, reducing my daily cafffeine dose while listening to the beats, the Hillbert curve part is specially amazing (4:44), I might cut it and make an extended mix!Chris Allen made some really crazy animations too (The wav is 32bit, 96KHz):
Ceiling fan receiver RH788R EE - Page 1
Forum section: electronics / general

author: DenCraw
author_rank: Contributor
timestamp: September 14, 2023, 02:43:30 pm
content: Hello, I would like to know if anyone is familiar with the "receiver" for a ceiling fan. This is model RH788R.I changed the driver that was burned but I think something must have happened with the serial eeprom. I have saved the data I had and formatted it and now it doesn't work at all. I put the data back in and speed 6 and 5 work. I estimate that it will have some parameters for the PWM. (pure guesses). The rest of the board is in order (voltages, thyristors, triacs, etc.).If anyone can provide me with the contents of the eeprom I would appreciate it. Maybe it is different for each model depending on the engine. Any help is welcome.

author: Halcyon
author_rank: Unknown
timestamp: September 18, 2023, 01:31:23 am
content: Duplicate post.