hybridfree/eevblog-posts huggingface dataset:
Agilent 5C2MIBA2A1 Microwave DIE - Page 1
Forum section: electronics / general

author: gnif
author_rank: Unknown
timestamp: August 26, 2022, 01:41:41 pm
content: Just got an interesting result from one of my eBay alerts, no idea what it's for but it looks pretty.Perhaps a collector would be interestedWould love to see this under a microscopehttps://www.ebay.com.au/itm/265850251243
May I ask why you do not have a forum section for "algorithms"? - Page 1
Forum section: electronics / general

author: dastructhm
author_rank: Contributor
timestamp: August 26, 2022, 02:32:53 pm
content: In my humble opinion, I think the most important part of a product is its algorithm inside its MCU, not its circuitry or its fancy software. Data structures and algorithms are the most valuable intellectual property, which may outgun rivals' products in terms of data accuracies.For example, an IMU with no algorithms would cost 5 dollars, whereas an IMU features Kalman Filter could be sold at thousands of dollars.so...I was wondering...you know...

author: rstofer
author_rank: Super Contributor
timestamp: August 26, 2022, 05:13:06 pm
content: Would this kind of thing fit in the "Programming" sub-forum?Due to the IP nature of 'algorithms', I wouldn't expect a lot of traffic.Then there is Google, the repository of all human knowledge:https://www.kalmanfilter.net/default.aspx

author: daqq
author_rank: Super Contributor
timestamp: August 26, 2022, 05:39:59 pm
content: Because it falls reasonably well under the other categories such as Programming or Microcontrollers. Also, the forum is more electronics oriented, so the finer points of Zener diode temperature curves will be more the focus than the finer points of the seventy eight variation on the FIR filter.
Replacement for vintage ALPS 535T 11 step sliding switch? - Page 1
Forum section: electronics / general

author: cincin
author_rank: Regular Contributor
timestamp: August 18, 2022, 04:59:25 pm
content: GreetingsI'm working on an old Kawai PM100 electronic piano. This unit has a fader-style stepped switch for the transpose control, and it's loose and malfunctioning. Same form factor as a regular fader pot, but with steps, which allows you to select the transpose +1 -1 etc. The only markings on the part are "ALPS JAPAN 535T".I can't find much at all about the ALPS 535T online, no datasheet to be found. I contacted ALPS but have yet to hear back. It has 11 steps and 5 pins.Are these types of switches available at all today? I couldn't find much about 11 steps slide switches in general. Am I calling the part wrong? (searching the wrong keywords)I could attempt a repair on the part itself, but I hear the crimping on these things makes them hard to open and close without messing it up.Any tips greatly appreciated! Cheers!

author: cincin
author_rank: Regular Contributor
timestamp: August 27, 2022, 03:19:16 pm
content: Well, turns out the linear encoder switch has 12 positions, not 11... I still can't find anyone making linear encoder switches though...
Looking for 14-pin connector - Page 1
Forum section: electronics / general

author: martin321
author_rank: Newbie
timestamp: August 25, 2022, 09:24:46 am
content: Hi,I have broken connector and are looking for a replacement.Have not been able to find anything on Digikey or Mouser.It's for the radio panlen in an Mitsubishi Mievcar.Pitch is 1.00mm and 14 pins.
Artemis1 Trajectory design. - Page 1
Forum section: electronics / general

author: hamster_nz
author_rank: Super Contributor
timestamp: August 22, 2022, 05:12:35 am
content: With the upcoming Artemis 1 mission a little over a week away, this PDF makes interesting reading on the planning that goes on behind this sort of mission:https://ntrs.nasa.gov/api/citations/20205005150/downloads/AAS20649_Artemis1_Trajectory_Design_Optimization.pdf

author: AndyBeez
author_rank: Frequent Contributor
timestamp: August 22, 2022, 09:47:00 pm
content: In space, no-one can hear you bleat!https://www.esa.int/Newsroom/Press_Releases/ESA_names_first_astronaut_to_fly_on_the_Artemis_I_lunar_mission

author: hamster_nz
author_rank: Super Contributor
timestamp: August 22, 2022, 11:12:54 pm
content: Quote from: AndyBeez on August 22, 2022, 09:47:00 pmHope they pack enough crackers.
Should I go high side or low side for current measurment in my Lab power supply - Page 1
Forum section: electronics / general

author: Sarvesaa
author_rank: Contributor
timestamp: August 20, 2022, 04:07:22 am
content: Hi guys,I am building a power supply with a 3055 transistor. With 0-24V output and also with current limiting function.I prototyped it on a breadbroad and it works fine, the voltage goes all the way down to 0.050V. Good enough I guess.I want to have a panel showing the output terminal voltage and the current flowing. Also POWER by just multiplying voltage and current in arduino code.I have a ADS1115 16bit ADC laying around and I want to use it in this project for sensing voltage and current which would be perfect for this project.I am not sure whether to put the shunt on High side or Low side.Thank youWith RegardsSarvesaa Jagan

author: Colt45
author_rank: Contributor
timestamp: August 20, 2022, 06:24:34 am
content: I feel like low side is more typical as that's more likely to be in common mode input range of whatever amp you stick on it... though some go to V+ and not V- (TL07x, eg)

author: frogblender
author_rank: Regular Contributor
timestamp: August 22, 2022, 06:33:59 pm
content: Current has a way of sneakily sneaking back to the source using other ground paths.Example: recently I used a DC clamp meter on a computer's ATX powersupply aux connectors (the cable that powers your GPU): clamping the positive wires showed 20amps.... but clamping the negative showed 6amps... because some of the return current was sneaking back through the motherboard's ground.If your power supply is utterly isolated, then this won't be a problem.

author: David Hess
author_rank: Super Contributor
timestamp: August 22, 2022, 09:00:25 pm
content: As long as the supply is floating and only grounded at the output terminal, either high or low side sensing can be used. Often high side sensing is preferred despite any inconvenience because it makes control of a dual bipolar supply easier, like on a Tektronix PS503A power supply which has simultaneous positive and negative outputs.

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 22, 2022, 09:16:14 pm
content: Yep. Note the importance offloating.
THERMAL PADS:  too sticky when *dis-assembling*.  What to do? - Page 1
Forum section: electronics / general

author: frogblender
author_rank: Regular Contributor
timestamp: August 19, 2022, 05:30:42 pm
content: I have a PCB with a big piece of aluminum used for heatsinking. The CNC'd aluminum touches all the hot components (DDR, power regulators, etc) using 1mm-thick thermal pads. There are 30 pads on the aluminum (ie. 30 components on my PCB need to be cooled).Thermal pads come in 3 flavors: not sticky, sticky one side, and sticky two sides.I use sticky one side.The problem is duringdisassembly: despite one side not being sticky, with 30 pads shmushed in there, separating the aluminum from the PCB requires alot of force, with much wedging/peeling/fiddling, and most importantly, bending of the PCB, which breaks my BGA solder joints.So the question: Anyone have any bright ideas on how to disassemble the heatsink from a PCB that has lots of thermal pads?

author: ataradov
author_rank: Super Contributor
timestamp: August 19, 2022, 05:58:19 pm
content: Use a thread or a fishing line and pass it between the board and the heat sink. It would let you cut the pads individually without applying to much force. This would destroy the pads, so if you need to do this often, it might not be the most economical solution.

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: August 19, 2022, 06:47:12 pm
content: Quote from: frogblender on August 19, 2022, 05:30:42 pmRedesign the board with larger dissipative arrays of vias around the hotpoints and use one thick thermal foam on the entire aera of the PCB.

author: thm_w
author_rank: Super Contributor
timestamp: August 19, 2022, 08:19:32 pm
content: If the fishing line or floss idea doesn't work, does heating the assembly help? Could use a hair dryer.Twisting the board instead of wedging might be more gentle as well.

author: frogblender
author_rank: Regular Contributor
timestamp: August 22, 2022, 06:27:40 pm
content: Thanks to all the dudes/dudettes who replied.- fishing line would be viable... except the components are all different heights- heating the whole thing up is worth a try.... if I do it, I'll report back here...- redesign for more vias and whatnot (ie. heat transfers into the PCB) - this is what I want (on the next board): inject heat into the PCB (many of the components in question have the big SMT "power pad" gnd on the bottom, and then remove the heat using the aluminum heatsink's standoffs (the aluminum heatsink is made from a single piece of aluminum, standoffs and all).However... I've discovered I've foolishly used "tacky-2-sides" thermal pads.... when I should've used tacky-1-side

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: August 22, 2022, 06:46:17 pm
content: Quote from: frogblender on August 22, 2022, 06:27:40 pmYou can also try to put some grease on the pads before mounting them.

author: Benta
author_rank: Super Contributor
timestamp: August 22, 2022, 07:27:11 pm
content: Quote from: Coordonnée_chromatique on August 22, 2022, 06:46:17 pm+1Normal white thermal grease in a thin layer would be my suggestion.
Electric pulse supposed to create Carp barrier to the Great Lakes. - Page 1
Forum section: electronics / general

author: TimFox
author_rank: Super Contributor
timestamp: August 22, 2022, 08:21:58 pm
content: The same technique was used over 50 years ago when lampreys got to the Great Lakes through the new St Lawrence Seaway project, but too late to save the lake trout fishery.

author: coppercone2
author_rank: Super Contributor
timestamp: August 22, 2022, 08:33:01 pm
content: they should just put a rail road track and hire some people to build pipes for the sewage instead of this madness

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 22, 2022, 08:36:10 pm
content: Nice shit.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: August 22, 2022, 09:13:54 pm
content: The best solution would be to close the canal, but, as always, profit trumps ecological disaster.
Pace desoldering heater replacement. - Page 1
Forum section: electronics / general

author: harps
author_rank: Regular Contributor
timestamp: November 10, 2013, 09:51:01 pm
content: helloI have an old Pace de-soldering station.... An mBT-100e, with possibly an old style SX-55a hand piece. (no code so not 100% sure).i need to replace the heater : (They do not sell the sx-55 heater these days, but the sx-70 heater looks the same size and shape, but has two extra wires, for a sensor i believe.I wonder does anyone know if this would fit the older hand piece?thanks for any help!: p

author: pe2ben
author_rank: Contributor
timestamp: August 20, 2022, 03:56:48 pm
content: Hello.I know it is a long time a go but do you found a replacement for the pace sx-55?Regards Ben

author: --Oz--
author_rank: Regular Contributor
timestamp: August 21, 2022, 07:57:57 pm
content: If you cant find a replacement for a decent price, I have had this one for $28 for 3.5 years and using it everyday at work, now under $40, plus there is parts for them.https://www.aliexpress.com/item/3256803613354753.html?spm=a2g0o.productlist.0.0.15343737bTxNdv&algo_pvid=c7b4c7e3-945f-4c4b-a2e6-89f8ee2b0a24&algo_exp_id=c7b4c7e3-945f-4c4b-a2e6-89f8ee2b0a24-7&pdp_ext_f=%7B%22sku_id%22%3A%2212000027206948098%22%7D&pdp_npi=2%40dis%21USD%2147.94%2138.35%21%21%21%21%21%402103143616611117018002907ee844%2112000027206948098%21sea&curPageLogUid=C8qrnZlUdw0y

author: tooki
author_rank: Super Contributor
timestamp: August 21, 2022, 08:40:07 pm
content: Quote from: --Oz-- on August 21, 2022, 07:57:57 pmThat's not a vacuum desoldering station, dude.

author: --Oz--
author_rank: Regular Contributor
timestamp: August 21, 2022, 10:07:22 pm
content: Quote from: tooki on August 21, 2022, 08:40:07 pmDoh, I misread it, my bad. Regarding desoldering equipment, I find the silverstat desolder manual pump the best, but ymmv specially with different techniques used. Have a good day.

author: tooki
author_rank: Super Contributor
timestamp: August 22, 2022, 07:26:51 am
content: A solder sucker is in no way comparable to vacuum desoldering equipment.As I wrote inthis postthe other day to someone else who doesn’t understand the difference:QuoteThe one-shot suction of a solder sucker doesn’t allow the cooling-in-motion that’s so critical to desoldering from plated through-holes.In a subsequent reply to that person, I also suggested:QuoteIt really does a beautiful job of demonstrating the principle.
MailStore --- anyone using this program? - Page 1
Forum section: electronics / general

author: Jester
author_rank: Frequent Contributor
timestamp: August 20, 2022, 05:43:54 pm
content: I wanted to make a backup of all emails to my local drive for a Google Workspace account (gmail). I tried both the google Workspace export as well as Google takeout and both simply don't work on my Win 7 PC.I then created a new gmail account and imported from the Workspace account and that worked seamlessly, however I'm still at the mercy of google.I tried Gmvault to make a local copy, but Google blocks that program. Next I tried the tool MailStore that archives and exports email accounts and it worked quickly and seamlessly. While in the mailStore GUI I can see all my emails, however the file size of the local folder that they are stored in is only 65MB vs. 5GB that Google claims to be using to store the emails. Yesterday I deleted about 4000 old emails (1000 remaining) and this reduced the Google claimed space from 13GB to 5GB.What I'm trying to determine is: Does gmail save email in such an inefficient fashion as to consume massive amounts storage space (5GB vs. 65MB)?
Fluke 164 Counter Demo Aid - Page 1
Forum section: electronics / general

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 12:37:04 am
content: I found an interesting 1979 relic from Fluke.From what I gather from the markings, it appears to be a signal generator for frequency counter product demonstrations.It can be AC powered or powered by its internal 4 D cell NiCD batteries.It just takes unscrewing 1 screw to slide the entire unit out of the case. Accepts 115V or 230V via switch on the board.Sorry about the poor smartphone pics!

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 12:43:34 am
content: Here are the internals.The 4 NiCd D cells have shrink wrap around them, along with cardboard protectors to protect the board from battery leakage.

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 12:52:19 am
content: Non-custom IC's, standard GE NiCD D Cells. Looks good for 40+ yrs old.

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 12:54:30 am
content: Cool thing is, it still works, as a Fluke should

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 12:57:59 am
content: Scope readings, from left to right BNCs, going through each setting. The knobs were set to top dead center.(sorry I'm still a scope noob)

author: sambonator
author_rank: Regular Contributor
timestamp: May 02, 2019, 01:01:16 am
content: Last 4 scope readings. Hope you enjoyed!Only thing that didn't make sense to me is the DC setting (DC 5V 10KOhm... what is that for?).

author: lowimpedance
author_rank: Super Contributor
timestamp: May 02, 2019, 03:34:35 am
content: Interesting unit , built into the same housing used for their 8000 series DMM's and the 1900a counters. Same nicad battery layout as well.Relic indeed, thanks for posting

author: sambonator
author_rank: Regular Contributor
timestamp: May 08, 2019, 10:00:12 am
content: I'm going to put this on the bay... I don't have room for collecting vintage equipment, and I had fun with this already, so time to pass it onI need to do that with my HP 3455A too.Got it "parts or not working" and "untested" so I expected to do some learning and repair... but seems to be spot on in all measurements and quite stable, so I don't want to mess it up!

author: tooki
author_rank: Super Contributor
timestamp: August 19, 2022, 05:02:17 pm
content: A Fluke 164 counter just came up for sale on the local auction site, so I suspect that the object above is the demo aidforthe 164, rather than being named “164” itself. Given that the 164 counter is 20 years younger than 1979, I bet they just found an old generator in a closet and gave it custom labeling because… reasons.The 164 looks like an interesting critter, in that it’s in a ScopeMeter housing and has some interesting scope-like features, and a really odd sampling mode where it samples at various voltage thresholds, rather than by time. See the attached datasheet.
Curious:  Common positive solar on a common negative van? - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: August 17, 2022, 07:57:22 am
content: So I was watching this:I have the same charge controller, though a smaller model and a different brand. (Mine is EPEver).The thing is, mine is "common positive". Automotive electrics are common negative.My thoughts where, how could you have wired this up to a van at all? I mean the panels much be grounding to the body of the van, no?And when they connect the "LOAD" - and + to the van 12V system, surely that then forces the charge controller to float at -12V?Surely this is unwise and could potentially (bad pun) been what cause the unit to combust.

author: thm_w
author_rank: Super Contributor
timestamp: August 17, 2022, 09:07:36 pm
content: Are you saying the case of your MPPT controller is electrically connected to +12V?Solar panel cells are completely isolated from the aluminum frame. Usually you would ground the frame for lightning/safety reasons.

author: Someone
author_rank: Super Contributor
timestamp: August 17, 2022, 09:59:25 pm
content: Quote from: paulca on August 17, 2022, 07:57:22 amNo, most panels are floating and its up to the installer to decide where the cells are relative to ground (series panel strings... ).

author: paulca
author_rank: Super Contributor
timestamp: August 18, 2022, 08:21:53 am
content: Quote from: thm_w on August 17, 2022, 09:07:36 pmThat's a good point. I don't know. It says it's common positive and I believe the 3 DC terminals (panel, battery and load) all have a common bus for +.I never tested if the case was connected to either.

author: thm_w
author_rank: Super Contributor
timestamp: August 18, 2022, 08:56:17 pm
content: If the case is isolated, and you run proper wires to each component instead of using a chassis as return, I'm not seeing what the issue would be.Even if its not isolated, it could go into a large plastic enclosure.
Can anyone identify the manufacurer. - Page 1
Forum section: electronics / general

author: innkeeper
author_rank: Unknown
timestamp: August 17, 2022, 08:56:48 pm
content: I bought some supposed Fairchild parts off amazon that I suspect are Chinese off-brand parts.can anyone identify the manufacturer?pic below

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 18, 2022, 10:23:16 am
content: Hmm, well, the markings do correspond with what is expected according to the latest On Semi datasheet (Fairchild now being part of them), the "WK52" being factory, wafer, and week number. But, the lines are in the wrong order - it supposedly should be "BS170" on the first line. Older Fairchild datasheet doesn't give any info on package markings, unfortunately.I'd have a search on LCSC and compare pictures. That'll probably tell you if they're actually a different brand.

author: Messtechniker
author_rank: Frequent Contributor
timestamp: August 18, 2022, 12:51:56 pm
content: My collection of BS170 yields two typesMarking BS170 is older than the Siliconix types.All bought well before any chinesium types appeared.

author: david77
author_rank: Frequent Contributor
timestamp: August 18, 2022, 12:56:05 pm
content: I look at the font BS170 is printed in and wanna say Philips. But then again the markings are not straight that makes me wanna say Chinesium? I don't know.

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 18, 2022, 02:54:12 pm
content: Actually, on further investigation, it is probablynota Fairchild BS170. From photos I've found searching on Google, Fairchild ones should have 'F' logo on them, and definitely the manufacturing code and part number the other way around, exactly as per datasheet.

author: innkeeper
author_rank: Unknown
timestamp: August 18, 2022, 03:19:19 pm
content: Quote from: HwAoRrDk on August 18, 2022, 10:23:16 amah LCSC its worth a look for sure...update: no luck on finding it on LCSCalso, i saw the same thing today on the datasheet with the part number in the top row.... I've never seen one like that yet in the wild and somthing to keep an eye out for..., that sheet also doesn't show a logo.a current example from LCSC of the onesmi part and all I've ever seen them looking like.

author: innkeeper
author_rank: Unknown
timestamp: August 18, 2022, 03:20:27 pm
content: Quote from: HwAoRrDk on August 18, 2022, 02:54:12 pmThats my thinking, i am curious who makes it though.
SANS ICS HyperEncabulator - Page 1
Forum section: electronics / general

author: ledtester
author_rank: Super Contributor
timestamp: August 17, 2022, 01:58:17 am
content: The original "Rockwell Retro Encabulator" video uploaded in 2008 is here:https://youtu.be/RXJKdh1KZ0wTIL: "encabulator" is an anagram of "nuclear boat".
gate driver issue - Page 1
Forum section: electronics / general

author: husain512
author_rank: Newbie
timestamp: August 16, 2022, 09:37:01 pm
content: I am working with a gate driver IC , just using high side and ignoring low side but after many attempts I am just getting 15 v dc at gate pin instead of pwm signal. What could be the issue ?

author: Benta
author_rank: Super Contributor
timestamp: August 16, 2022, 09:45:42 pm
content: Far too unspecific. My crystal ball is broken, and telepathy was never my strong side.But if you're wroking with IR21xx-like types, the high-side driver only works if the low-side driver is being pulsed.
Farnell web order problem - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: August 19, 2022, 12:49:48 pm
content: expert in breaking down webpages I visit. Elfaforums was my last victimPlaced order 41.83EUR on 220817webpage vent into maintenance. (~5s) after restart it was fine and I completed my order(google chrome browser)didnt receive order confirmationregistered new farnell account, couldnt login via phone, but order is not there either (not tied to my email( entered wrong email? ))contacted customer service 220818Bank confirmed payment 29.49EUR on 220819Farnell still cant find my order

author: bd139
author_rank: Super Contributor
timestamp: August 19, 2022, 01:14:39 pm
content: Typical Farnell. Their web site is a shit show.Payment probably hasn't cleared yet. The bank will see it as pending for a few days rather than cleared. I'd order it from another supplier and see if it times out. If it doesn't charge back the fuckers via the bank.I love Farnell so much I buy stuff from Mouser. It turns up quicker as well even though it comes from the USA

author: strawberry
author_rank: Super Contributor
timestamp: August 19, 2022, 06:07:27 pm
content: pending 41.83EUR*mean cleared 29.49EURhow could amount not match?here one day pending is normal (manual order processing due to low volume)even mouser takes to deliver 2..5days for some last ~300km
RIP Sir Clive Sinclair - Page 1
Forum section: electronics / general

author: oPossum
author_rank: Super Contributor
timestamp: September 16, 2021, 06:19:14 pm
content: Quotehttps://www.theguardian.com/technology/2021/sep/16/home-computing-pioneer-sir-clive-sinclair-dies-aged-81

author: voltsandjolts
author_rank: Unknown
timestamp: September 16, 2021, 06:30:52 pm
content: As a kid I spent quite some time typing code into a ZX81. I learnt a lot, so thank you, Sir Clive.Recommended watch:https://youtu.be/XXBxV6-zamM

author: AccountRemovedPerUsersRequest
author_rank: Regular Contributor
timestamp: September 16, 2021, 07:21:13 pm
content: RIP. My first computer was ZX-81. Those were the days...A

author: nali
author_rank: Frequent Contributor
timestamp: September 16, 2021, 07:58:32 pm
content: Me too. And before that as a teenager I had one of the Cambridge programmable calculators with its flimsy egg-carton white plastic case - took me ages to save up for it!

author: Kerlin
author_rank: Regular Contributor
timestamp: September 17, 2021, 08:50:37 am
content: Actually he goes further way way back than computers. He had products which included transitory radios and some of the first audio amp ICs.A transistor radio from 1967.https://www.petervis.com/Radios/sinclair-micromatic-pocket-radio/sinclair-micromatic-pocket-radio.html

author: eti
author_rank: Super Contributor
timestamp: September 18, 2021, 01:35:55 am
content: My Dad remembers cycling across Cambridge to their factory to collect a kit, at some point in the past.I must say that his products always had a certain “Alan Sugar” vibe to them, and that’s not a compliment.

author: vk3yedotcom
author_rank: Frequent Contributor
timestamp: August 15, 2022, 12:29:27 pm
content: BBC documentary just released to their archive

author: dmills
author_rank: Super Contributor
timestamp: August 16, 2022, 08:51:47 am
content: He also did a shockingly poor early class D audio amp as a kit, and does anyone else remember the flat telly they did?

author: andy3055
author_rank: Super Contributor
timestamp: August 16, 2022, 04:18:24 pm
content: Yep, I remember the time a friend of mine had one of his kit amps. The top of those transistors would just fall off all the time and I ended up replacing them with Japanese transistors. This was in the mid '70s!He catered to the kids who couldn't afford to buy expensive stuff. It was fun putting them together!

author: MT
author_rank: Super Contributor
timestamp: August 16, 2022, 06:02:11 pm
content: Dave did a teardown on the flatty tube in 2013.
safe tape for through hole parts? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 14, 2022, 02:13:35 am
content: What is a safe tape to use (esd wise, like the paper stuff they put on strips)?I want to sort some diodes and stuff. I put them in ESD bags and then into a binder, but I want to bind them together like on a tape.Preferably something with low residue.

author: Psi
author_rank: Super Contributor
timestamp: August 14, 2022, 03:14:37 am
content: Kapton tape is pretty safe to use.Also doesn't leave residue and is common in the electronics field(Also called polyimide tape, kapton is a brand)

author: coppercone2
author_rank: Super Contributor
timestamp: August 14, 2022, 05:42:17 am
content: Hmm I Guess that would work. Can't be torn easily though, which is not convenient for shortening a strip of resistors.

author: jpanhalt
author_rank: Super Contributor
timestamp: August 14, 2022, 10:43:44 am
content: The component strips I have seen appear to be made with a paper-backed masking tape over a thin cardboard backing. Adhesive residue is often left on the component leads. Paper backing allows the tape to be torn easily. Why can't you use the same? 3M and others make a variety of paper-backed tapes. Some of the adhesives used may leave more residue than others.

author: coppercone2
author_rank: Super Contributor
timestamp: August 14, 2022, 06:29:18 pm
content: but are these tapes ESD safe? I thought semi conductor manufacturers might use special glue and stuff for things like diodes. The paper tape must be approved for like official use since thats how they sell parts.I have a diode sorting problem reallyFor instance using scotch tape in this application seems like a really bad idea. Does the glue not form a thin sheet of plastic with triboelectric effect on the surface of masking tape?

author: tooki
author_rank: Super Contributor
timestamp: August 14, 2022, 06:46:31 pm
content: Most diodes aren’t particularly ESD-sensitive.But honestly, I’d just buy convenient size zipper baggies and store them in those, within the bigger bags. Get antistatic or static dissipation bags if you feel like it, but it’s not critical for diodes.

author: coppercone2
author_rank: Super Contributor
timestamp: August 14, 2022, 07:20:41 pm
content: I did not think it would be called masking tape but its called masking tapehttps://www.eis-inc.com/product/masking-tape-ph22-8126and you can get ESD safe paper for the other sidehttps://www.hisco.com/Catalog/Static-Control/ESD-Safe-Binders-Tags-Document-Holders/ESD-Safe-Paper-and-Padsso it looks like you can lay the parts out over paper strips, put a seperator comb on top, and tape it down on both sidesNot too bad since the part length is usually 50-60mm, and you can make 10 strips quickly
What's the site Dave used to view peoples solar data all over the world? - Page 1
Forum section: electronics / general

author: niels007
author_rank: Contributor
timestamp: August 14, 2022, 12:19:09 pm
content: Heyho,Way back, but I can't find the exact video anymore, I think Dave looked at some random Dutch consumer solar installation power data, probably when discussing the amazing Solar Frickin Bicyclepath in Amsterdam....I can't seem to find that video and can't find that site that allows you to view random peoples solar data. Anyone got a link?Cheers,Niels

author: ebastler
author_rank: Super Contributor
timestamp: August 14, 2022, 12:43:56 pm
content: I think the video you refer to is #681. In that video, from approx. 7:15 onwards, Dave refers to the solar irradiance calculator athttp://www.solarelectricityhandbook.com/solar-irradiance.html.That caclulator does, of course, not show specificpeople'sirradiance data, but lets you select a country, city, and the panel direction. It then shows average irradiance by month, for various vertical orientations of thje panel surface.

author: niels007
author_rank: Contributor
timestamp: August 14, 2022, 12:51:03 pm
content: Hmm no that's not it, I saw that video today hoping it would be the one.It was some google-maps looking thing where you could view people's solar system data, it was quite neat!

author: ebastler
author_rank: Super Contributor
timestamp: August 14, 2022, 01:09:50 pm
content: PVOutput.org maybe? Wasn't in the solar roadways/bikepaths videos though, but in a video about Dave's own rooftop system.https://pvoutput.org/list.jsp?userid=22501is Dave's own data, I assume. There is also a map view, but I see Australia/NSW only. (Have not registered.)
Lunar dust and EVA suits - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 14, 2022, 02:16:37 am
content: Interesting video on the lunar dust problem that destroys suits.Gets good about 7 minutes in.New generations of suits will have outer layer with carbon nanotube structure to actively repel the dust with their own magnetic field.
HP 521C Electronic Counter 1Hz to 120kHz test teardown 1963 - Page 1
Forum section: electronics / general

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 11, 2022, 07:44:39 am
content: wow this monster contain 44 tubes :-)all details herehttps://youtu.be/0DHNVEqzso4

author: CaptDon
author_rank: Super Contributor
timestamp: August 12, 2022, 07:32:09 pm
content: That's nothing!!! You should see their units with the mixer front ends going into the hundreds of megahertz. I think some of those had 10 columns.Some dinosaurs are worth feeding, those old HP units are not.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 12, 2022, 10:35:26 pm
content: Man thats something i never saw, beautiful to say the least

author: jonpaul
author_rank: Super Contributor
timestamp: August 13, 2022, 01:47:27 am
content: used them in 1967 at LBLa walk down memory laneJon

author: Colt45
author_rank: Contributor
timestamp: August 13, 2022, 04:26:05 am
content: I still regret not getting one of these from the same family, when it was available for freeMy car was already full of other test equipment, is the only consolation... they are gigantic.

author: alm
author_rank: Super Contributor
timestamp: August 16, 2022, 11:19:00 am
content: Interesting device! So this was a frequency counter already? And not the older type of frequency meter where a cap is charged with pulses from a constant current source at the same frequency as the input. The HP memory page describes it as a counter but does not go into details.Funny how this was considered portable and small...

author: CaptDon
author_rank: Super Contributor
timestamp: August 16, 2022, 02:04:43 pm
content: That monster of a counter with the nixies is actually the 'smaller' version of the counter with around 10 columns of neon bulbs like the counter in your first picture. Some of those old counters used 'Beam Switching Tubes' with ten cylindrical magnets inside. I had a 4 digit El Segundo Electric audio frequency counter that used the 'ring around the rosey' glow transfer tubes. It had a syncronis line frequency motorized timebase!! Wish I still owned it, it was a real eye-catcher to see it in operation!!
Solar panel testing by energizing them - Page 1
Forum section: electronics / general

author: andyB2022
author_rank: Regular Contributor
timestamp: August 10, 2022, 04:54:53 pm
content: Hi! While I was roaming on YTI've found a guy who showed a pretty "clever" method of how we can test a solar panel that appears to be with the naked eye in very good condition, but...under an IR camera the whole story is different.Video link:

author: thm_w
author_rank: Super Contributor
timestamp: August 10, 2022, 10:09:47 pm
content: Very cool.Now to look around and see if there are any cameras that can be easily modifiedhttps://www.extremetech.com/electronics/144388-how-to-turn-your-dslr-into-a-full-spectrum-super-camera

author: andyB2022
author_rank: Regular Contributor
timestamp: August 11, 2022, 06:55:07 am
content: Or just use a regular camera and buy an IR cutoff filter as the guy in the video above did.Looks like there are people out there that test those solar panels even in the field, check the photo below.This might be a great video ideea for Dave, I guess

author: Silicium81
author_rank: Regular Contributor
timestamp: August 11, 2022, 07:10:09 pm
content: See here, I tested defective solar panels with this method. (in french)A filter placed in front of the lens cannot work, the internal filter must be removed.https://vae-tech.forumactif.org/t229-tester-un-panneau-photovoltaique-en-electroluminescence#2108

author: james_s
author_rank: Super Contributor
timestamp: August 11, 2022, 09:08:30 pm
content: Many inexpensive security cameras have a night mode that uses a solenoid to move the filter out of the way, in many of these you can also turn off the IR illuminator, so no modification needed.
Reliability of accelerometers. - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: August 08, 2022, 10:53:43 am
content: I've been using an old NXP/Freescale MMA7660 accelerometer in a product for many many years and never had any problems with it. But the chip has been out of production for a while now and I've been running through my old stock which is now gone.It has come time to replace the accelerometer in the product with something new and I'm unsure how reliable the modern brands are. For this application I do need one that isn't going to lock-up randomly.Some drift/error is ok, but not a lockup.Anyone have any recommendations for good brands, or brands to stay away from?I see there are lots of MEMSIC accelerometers available, but I've never heard of that brand until now.And some ST ones are available too, but stock is limited.

author: jpanhalt
author_rank: Super Contributor
timestamp: August 08, 2022, 12:30:26 pm
content: I used the MEMSIC MXD2020, and it never locked up. It works on a different principle than cantilever or ball accelerometers. Sears also used the same device in its early, digital torpedo level. It is no longer available, but MEMSIC still produces comparable devices. MEMSIC has been around since 1999.https://www.memsic.com/thermal-accelerometerhttp://ww1.microchip.com/downloads/en/AppNotes/00996a.pdf

author: Psi
author_rank: Super Contributor
timestamp: August 09, 2022, 01:27:45 am
content: Do I need to be careful about asking the PCBA house not to do any ultrasonic cleaning of the PCB with MEMS accelerometer?I've never worried about it in the past with the MMA7660 but I'm unsure how sensitive newer accelerometers are.

author: jpanhalt
author_rank: Super Contributor
timestamp: August 09, 2022, 01:48:07 am
content: I cannot advise you on that. The device is quite robust, and I don't recall seeing any such precautions mentioned in its datasheets or application notes. It is my understanding that since there is no moving mechanical part it is safe to clean and even drop. That is one reason I chose it. If still in doubt, call Memsic.The sensing chamber is hermetically sealed with solder, and I was advised by one if Memsic's technical people that overheating while soldering can be a problem. We were discussing hand soldering specifically. I suspect reflow is less of a problem, but it might be worth checking whether there is any special precaution that needs to be taken. The Sears level appeared to be reflow soldered. Attached is a picture of the PCB from the Sears level. Device is silver colored upper left.
Customs formalities in Australia  - Page 1
Forum section: electronics / general

author: andy3055
author_rank: Super Contributor
timestamp: August 12, 2022, 11:11:38 pm
content: Not really a technical but...I have a friend in Australia who needs some of my old stock of semiconductors. If I just mail them what sort of duty would he be subject to?They are not in commercial quantities but just one or two pieces of different transistors and stuff like that which are hard to find at present.

author: mag_therm
author_rank: Frequent Contributor
timestamp: August 12, 2022, 11:25:40 pm
content: I have mailed hobby tools and materials < $100 to Australia by USPS.Fill in the customs forms, I suggest "Hobby electronic components"And state a value that can be verified eg by prices online.

author: Someone
author_rank: Super Contributor
timestamp: August 13, 2022, 12:37:34 am
content: Under $1000 usually goes through without any hassle. Couriers love their declared value vs commercial value vs liability value vs other similarly named value shenanigans, its rather confusing. For a random selection of semiconductors just put: "electronic parts" qty n, value n*$5

author: andy3055
author_rank: Super Contributor
timestamp: August 13, 2022, 05:10:01 am
content: Great, thanks. Just the way I imagined.

author: Colt45
author_rank: Contributor
timestamp: August 13, 2022, 05:18:01 am
content: Huh, I figured everywhere in the commonwealth taxed the piss out of you if the declared value exceeded like $20. Guess it's just Canada.

author: andy3055
author_rank: Super Contributor
timestamp: August 13, 2022, 05:31:49 am
content: Pardon me for saying this but Canada post is horrible. With all that is going on, USPS is the best.I mailed a small packet to Toronto from the bay area and it took 2 days to get to Canada and then six days to the local address. They also pilfered some items. Anything going in the post in Canada is horribly expensive, even inside the country. It is a service here but a business in Canada!

author: johnboxall
author_rank: Unknown
timestamp: August 13, 2022, 07:04:53 am
content: If the value is under AU$1000 it won't cost the recipient anything.

author: andy3055
author_rank: Super Contributor
timestamp: August 13, 2022, 02:58:23 pm
content: Thanks. That sounds great!
thinking about switching from gearbox to internal gear hub on my bicycle  - Page 1
Forum section: electronics / general

author: DiTBho
author_rank: Super Contributor
timestamp: August 06, 2022, 08:54:05 pm
content: Yup, tempted

author: Benta
author_rank: Super Contributor
timestamp: August 06, 2022, 11:22:47 pm
content: https://www.topgear.com/videos/jeremy-clarkson/tg-makes-cycle-safety-ad-final-film-series-21-episode-5

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: August 07, 2022, 01:06:19 am
content: Quote from: DiTBho on August 06, 2022, 08:54:05 pmI hope they do something better with the gear selector at 11:00.

author: PlainName
author_rank: Super Contributor
timestamp: August 07, 2022, 04:38:43 pm
content: Eh, it's the hub that receives the wireless signal to switch gears. Once it gets to be common you'd hope they'll have the wireless security locked down fully. Probably won't protect against DoS attacks, though, so I think I'd prefer some non-RF means of achieving control.

author: thm_w
author_rank: Super Contributor
timestamp: August 08, 2022, 09:33:43 pm
content: How hilly is your area?If you want low maintenance and reliability just get a belt drive + Alfine/Nexus hub, should be enough if its not that hilly.They are cheap:https://www.bike24.com/p2285618.htmlhttps://www.bike24.com/p2188330.htmlThe high gear range is great if you have a cargo bike though.

author: nctnico
author_rank: Super Contributor
timestamp: August 08, 2022, 10:48:26 pm
content: 7 gears is at the lower limit of what is useable where it is flat. But the low maintenance is a good thing.

author: thm_w
author_rank: Super Contributor
timestamp: August 08, 2022, 11:04:39 pm
content: Quote from: nctnico on August 08, 2022, 10:48:26 pmMost of your bikes are 3 gears no?I agree for racing but I think 7+ is fine for average commute. Whats necessary to have is gear range, as there are various hills from 15-20% around here.The $75 one Alfine hub is 244%. Thats the same as what I'm using right now on a regular derailleur.Or you can get a 11 speed Alfine with 409% gear range, ~$400.

author: nctnico
author_rank: Super Contributor
timestamp: August 08, 2022, 11:35:09 pm
content: Quote from: thm_w on August 08, 2022, 11:04:39 pmNot any more. 7 speed is more or less standard on decent bikes.QuoteYou will also want some ranges in between otherwise the steps between the gears are too big. I used to have a 21 gear derailleur on my previous bike and for long stretches I liked to select the perfect ratio. The 7 gears I have now don't really allow for that.

author: thm_w
author_rank: Super Contributor
timestamp: August 09, 2022, 12:05:12 am
content: Quote from: nctnico on August 08, 2022, 11:35:09 pmYeah, understand and agree. Some people care about having the perfect cadence, some don't (fixed gear riders).In my case I prefer a good jump between gears so I'm not constantly shifting 2-3 gears at a time.Old school cassettes used to be wild in my eyes: 11-12-13-14-15-16-17-18 teeth.Now you can get wider spaced ones like these:https://www.aliexpress.com/item/2251832794900882.html
Start them young! Computer engineering for babies! - Page 1
Forum section: electronics / general

author: bigsky
author_rank: Regular Contributor
timestamp: August 08, 2022, 12:59:51 pm
content: Hi there,I don't think anyone has picked this up...Check out:https://computerengineeringforbabies.com/https://www.kickstarter.com/projects/babyengineering/computer-engineering-for-babies/(there are a few more videos on YouTube)How awesome is that!

author: themadhippy
author_rank: Super Contributor
timestamp: August 08, 2022, 01:51:53 pm
content: I was waiting to see one of the kids with the back off the book trying to see how it works

author: xrunner
author_rank: Super Contributor
timestamp: August 08, 2022, 02:01:18 pm
content: Next in the series - calculus for babies.

author: BradC
author_rank: Super Contributor
timestamp: August 08, 2022, 02:19:37 pm
content: Quote from: xrunner on August 08, 2022, 02:01:18 pmI'd buy that!

author: AndyBeez
author_rank: Frequent Contributor
timestamp: August 08, 2022, 02:27:29 pm
content: I was assured that when I was very young, I 'reverse engineered' everything to see how it worked. Including the radio. So I certainly would have pulled that apart!Idea time, soft toys in the shape if your favourite component: Tina transistor, Kelly capacitor, Randy resistor (he's strippey), Danny diode, Lisa LED, Timmy the tetrode... Any sewing bee makers out there?

author: rsjsouza
author_rank: Super Contributor
timestamp: August 08, 2022, 05:16:10 pm
content: Quote from: BradC on August 08, 2022, 02:19:37 pmOpen your wallet then!https://www.amazon.com/Introductory-Calculus-Infants-Omi-Inouye/dp/0987823914

author: bd139
author_rank: Super Contributor
timestamp: August 08, 2022, 06:39:18 pm
content: Unfortunately doesn't work.I started my eldest off on this years ago and she's starting biomedical stuff at university this year

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 08, 2022, 07:00:30 pm
content: Oh well.
Negative frequency - Page 1
Forum section: electronics / general

author: Dave3
author_rank: Regular Contributor
timestamp: August 01, 2022, 02:25:20 pm
content: Last week, I fell into the rabbit hole of "negative frequency". Is it just a quirk of the maths or a real-world phenomenon?I wanted to recommend Mark Newman's enjoyable and brief "negative frequency" introduction video. Mark brings together some complex ideas into layman's terms that even a beginning hobbyist can understand.The video clarified some tough concepts and his nifty 3-D diagrams were self-explanatory. The video briefly touches on: music, trigonometry, Fourier transform, AM/FM radio signals, sidebands, etc.Mark is an electronics engineer who recently published the book, "How the Fourier Transform Works". He also has a great "Circle of Fifths" introduction video for aspiring musicians.

author: niconiconi
author_rank: Frequent Contributor
timestamp: August 06, 2022, 03:03:25 am
content: In a previous project I was trying to build a software-defined radio, and initially I had a hard-time understanding the concepts of negative frequencies, analytic signals, and Hilbert transform. This video could've helped me years ago.
Taiwan-China War - Page 1
Forum section: electronics / general

author: 0xFFF0
author_rank: Regular Contributor
timestamp: August 03, 2022, 06:01:39 pm
content: What chips would be missing if it came to war. Would the global economy collapse because that's where the most important chips come from? Should companies like TI, Analog, Intel move their production facilities back to the USA or the EU?

author: Gyro
author_rank: Super Contributor
timestamp: August 03, 2022, 06:10:43 pm
content: I don't see this thread lasting long because the Mods will probably deem it political (or it will go that way by itself).I don't believe any of the large semiconductor manufacturers that you mentioned have any fabs in Taiwan. The problem would be the large number of fabless semiconductor companies who use TSMC.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: August 03, 2022, 06:18:48 pm
content: TSMC is headquartered in Taiwan. Shutting their fabs down would be a major impact to worldwide chip production.

author: gnif
author_rank: Unknown
timestamp: August 03, 2022, 06:19:21 pm
content: Note: I edited this post after tautech (thanks) brought to my attention that I was a little too quick to lock this thread down.Please be aware that the manufacturers are already working to address such concerns, please see:https://www.tsmc.com/english/aboutTSMC/TSMC_FabsUnfortunately the way this has been worded makes it likely to become very political thread and as political topics are not allowed here this thread has been locked.See Rule #5 -https://www.eevblog.com/forum/chat/forum-rules-please-read/