hybridfree/eevblog-posts huggingface dataset:
Identifying an old 1980s Z80 system board - Page 1
Forum section: electronics / projects

author: dexters_lab
author_rank: Unknown
timestamp: May 30, 2017, 03:53:59 pm
content: i found this board today, it was in amongst some other early 80s z80 related items. It looks to be a Z80 computer system with a disk controller board and i am just intrigued as to what it is as google isn't bringing anything back for me.The only identifiable markings are VM 5022 BR 00 on the main board and VM 5023 BR 00 on the disk controller, the ICs are dated around 1983does anyone recognise it?

author: grumpydoc
author_rank: Super Contributor
timestamp: May 30, 2017, 04:02:12 pm
content: Nothing enlightening on the reverse?

author: free_electron
author_rank: Super Contributor
timestamp: May 30, 2017, 04:34:44 pm
content: Philips mullard P2000 computerhow did i find this ?the SAAxxx chips are teletext chips. googleing SAA5057 showed this is a cyrillic character generator for teletext. the fact this board has serial ports, a header lableled IEEE ( GPIB port ) tells me this is a compute rof some sorts. the only machine i remember that had teletext generator chipsets on board was the philips P2000 series.https://en.wikipedia.org/wiki/Philips_P2000

author: CJay
author_rank: Super Contributor
timestamp: May 30, 2017, 04:53:45 pm
content: Quote from: free_electron on May 30, 2017, 04:34:44 pmWell, that and the Mullard logo on the sticker in the middle of the board with VM5022 was a bit of a giveaway for it being Philips/MullardNice board, does it boot?

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 30, 2017, 05:47:56 pm
content: I don't know, a P2000 has a cassette as a storage medium and 2 cartridge slots with connectors on the main pcb. A P2000C is a portable with 2 built-in diskdrives but the board looks different. Vincent, did you find a picture of the pcb?

author: dexters_lab
author_rank: Unknown
timestamp: May 30, 2017, 07:51:22 pm
content: thanksthere are no other markings on it, even underneath or in the copper layer and i didn't recognise the logo on the label, it also looks like the ROM for the Z80 is missing or i would have read it for clues!that P2000 doesn't look a perfect match though

author: free_electron
author_rank: Super Contributor
timestamp: May 30, 2017, 10:04:18 pm
content: there's different flavors fo the p2000. p2000t p200m p2000c.the presence of a cyrillic rom .... could have been a special build for those countries...
Identifying an SMD Op Amp - Page 1
Forum section: electronics / projects

author: ROFLCat
author_rank: Contributor
timestamp: January 27, 2021, 10:50:14 pm
content: Hello everyone,I hope you're having a good day.Recently, I purchased eight non-functional 1/8th standard brick 36-72V isolated active clamp flyback buck converters which some come from different manufacturers. Luckily, I was able to fix 4 up to now which is pretty awesome since I only own a DMM. The rest either have primary side MOSFETs that have let out their magic smoke, stuck in hiccup mode because of a false or maybe even true overcurrent, or have bizarre feedback issues.Most of these have SOT23-5 op amps on the secondary sensing the output current and the voltage and feeding it back using two optocouplers. An op amp I see often on these is one coded "RAARKJ" and the code is the same even if the boards were manufactured at different times or even by a different manufacturer.Can anyone help me find the datasheet for these?They use the usual SOT23-5 op amp pinout.Thank you!

author: networkingdude
author_rank: Contributor
timestamp: January 30, 2021, 02:27:07 am
content: Take a look herehttps://www.ustransistor.com/ic?search=RAARKJThere is an option to request datasheet.Thats all I could find.

author: ROFLCat
author_rank: Contributor
timestamp: February 03, 2021, 12:14:40 pm
content: Quote from: networkingdude on January 30, 2021, 02:27:07 amOh thank you so much! That's the closest thing to a real datasheet. I'll ask for the datasheet and see if I can get it.Thanks again
Identifying battery connector - Page 1
Forum section: electronics / projects

author: PP3331
author_rank: Contributor
timestamp: September 05, 2020, 05:55:45 pm
content: Trying to identify this lipo battery connector. Not concerned about the wiring (I already know that), just the designation of the connector type if possible. Thanks!

author: Renate
author_rank: Super Contributor
timestamp: September 05, 2020, 06:58:21 pm
content: I make it out as 1.75 mm pitch?

author: PP3331
author_rank: Contributor
timestamp: September 05, 2020, 07:05:00 pm
content: I just measured it closely -- exactly 2mm.

author: mzzj
author_rank: Super Contributor
timestamp: September 05, 2020, 07:21:30 pm
content: https://www.google.com/search?q=2mm+pitch+battery+connector&sxsrf=ALeKk02GZnxKppU9eVuRYmfQtdMEr8OMng:1599333630412&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjj26uH3tLrAhVUBhAIHTSRCOYQ_AUoAXoECAsQAw&biw=2560&bih=1451some of the results look familiar

author: PP3331
author_rank: Contributor
timestamp: September 05, 2020, 07:29:09 pm
content: Yep, there are a lot that look familiar. The trick is going to be finding exactly the right one. Thanks.

author: Renate
author_rank: Super Contributor
timestamp: September 05, 2020, 09:03:21 pm
content: Quote from: Renate on September 05, 2020, 06:58:21 pmOk, 2 mm.It's just that the ruler is not really in the plane of the contacts, either the top or the bottom.(The ruler snippets are from the photo, mm.)

author: PP3331
author_rank: Contributor
timestamp: September 05, 2020, 09:05:47 pm
content: It's hard to get a good photo with the ruler and I can't get my caliper in there. But in-person examination definitely comes out as 2mm.
Identifying Block "EC" in schematic - Page 1
Forum section: electronics / projects

author: Teun
author_rank: Regular Contributor
timestamp: January 31, 2024, 11:47:03 am
content: Hi,I was looking into this datasheet:https://www.richtek.com/assets/product_file/RT7800B/DS7800B-00.pdfCan someone help me understand what the EC and/or AP stands for?

author: selcuk
author_rank: Frequent Contributor
timestamp: January 31, 2024, 11:52:18 am
content: It is on page 8. EC (Embedded Controller) or AP (Application Processor). To update the firmware in RT7800B.

author: magic
author_rank: Super Contributor
timestamp: January 31, 2024, 11:57:20 am
content: For the record, EC is a chip used in laptops for various tasks which may include managing battery charging, power supply rails, cooling control, scanning the keyboard to report keypresses, etc. It's a fairly obscure thing whose name you never see in system software, because its functions are hidden behind abstract BIOS or ACPI interfaces (to the extent that they are exposed at all).AP means the main processor of phones, tablets, etc.

author: Teun
author_rank: Regular Contributor
timestamp: January 31, 2024, 12:00:26 pm
content: Ah thank you. That was very helpfull.
Identifying connector pinout of a large PSU - Page 1
Forum section: electronics / projects

author: dexters_lab
author_rank: Unknown
timestamp: April 25, 2016, 09:00:47 am
content: i have a 12v power supply from some IT hardware i want to power up and use. I can plug it into the mains but it stays in shut down mode, not even in standby as there are two pins on the connector i probably need to identify.The two pins are usually called something like PS_ON and PS_KILL. PS_ON works like your PC ATX power supplies, it just turns the supply from standby to full on, the other pin is usually shorted to ground when the power supply module is inserted into whatever it's powering, it's just an interlock so the supply won't power up at all unless it's plugged into the hardware...it's made by Artesyn but is a custom part for the Dell / EMC2CX3-80 SAN processor it came out of and i can't seen to get a pinout from artesyn, dell or emcI need to try and trace these two pins out of the 40 control pins in the connector located on the control boardany thoughts on the best way to do this?

author: wraper
author_rank: Unknown
timestamp: April 25, 2016, 09:12:19 am
content: Measure voltage between the each pin and the GND. If there is a voltage try to connect it to GND through the few tens of ohms current limiting resistor. Keep the pin connected and try others. If the PSU starts, try to remove the connections made by one at a time, to see if it stops and particular pin should be used.

author: nali
author_rank: Frequent Contributor
timestamp: April 25, 2016, 11:47:49 am
content: I have a 750W Dell supply, and although the pins are different (less) it might give you some clue FWIWhttp://pinoutsguide.com/Power/dell_server_24_6_psu_pinout.shtml#By the looks of it PS_KILL starts up the standby supply, and the other signals won't work before that's up, so I guess that's the only one which would have a voltage on it to start with. After that there's a bunch of 3v3 outputs as well as the logic inputs that will show a voltage so as Wraper says just go through them with a lowish resistor until it kicks into life..... you'll probably want to find the fan speed pin after that if you're planning on using it at home!

author: dexters_lab
author_rank: Unknown
timestamp: April 25, 2016, 12:42:44 pm
content: thanks guys, well as ever for me it's not proving simple!!of the 40 pins, 17 have significant voltages on them when it's plugged in and the main outputs disabled... have 15v, 10v, six at 3.3v, seven at 5.8v and a few oddball ones, -0.6, -3 etc referenced to the main output GND.this might take some time to figure out!

author: PA0PBZ
author_rank: Super Contributor
timestamp: April 25, 2016, 12:55:25 pm
content: Take a 220 Ohm resistor, short the pins to GND and see if the voltage drops. If it does that's a good candidate to connect to GND.(Been there, done that although yet again a different PSU.)

author: dmvy
author_rank: Newbie
timestamp: November 29, 2017, 05:25:00 am
content: Hi. Did you find path to turn on this PSU?
Identifying connector - Page 1
Forum section: electronics / projects

author: MichR
author_rank: Contributor
timestamp: February 17, 2016, 06:23:59 pm
content: Hello.I have bought a not-working HP G72 laptop because I had got a spare G62 motherboard and I had thought I could use it by just changing the board since they are pretty similar. Sadly, they are not: connectors and connections are quite different.That is why I need to identify the model of this connector. It is used for DC power. I have searched using google images several times with no success. I hope someone could help me.This connector has seven pins and I need to buy the male plug.Here are the measures taken with a caliper with 0.1 mm of sensibility:total length: 11.5 mmtotal width: 4.3 mmpitch: about 1.2 mm (it is difficult to measure it accurately)P.S.: I hope it is not the wrong forum category, I have found many threads about identifying things here.Thanks

author: Richard Crowley
author_rank: Super Contributor
timestamp: February 17, 2016, 06:33:31 pm
content: Your image (or whatever it was?) of the measurements didn't make it.You could simply state the measurement in text.It looks like it is adjacent to an ordinary 2-pin JST connector.So isn't it just a 7-pin JST connector?JST connectors come in different pin-pitch, so you will need to know that.

author: MichR
author_rank: Contributor
timestamp: February 17, 2016, 07:46:51 pm
content: Yes, it is an image with the measurements. You can see it at its original size by clicking on it. However, I added the measurements in text.I have already tried to look for this connector on the JST catalog but there are plenty of them and I could not find one that fits the same characteristics.
Identifying connectors - Page 1
Forum section: electronics / projects

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 01, 2023, 02:46:12 am
content: This looks fantastic:https://connectorbook.com/identification.html?m=NN&&fl=0000000000000000000000000000-3-Sadly I don't have any particular need for / reason to test it just now. So maybe you all can give it a spin!Tim

author: tooki
author_rank: Super Contributor
timestamp: May 01, 2023, 08:31:43 am
content: Yeah, the creator of it even posted here once:https://www.eevblog.com/forum/repair/what-is-this-connector-294869/msg3761945/#msg3761945
Identifying double digit 7 segment display - Page 1
Forum section: electronics / projects

author: Ario
author_rank: Regular Contributor
timestamp: March 12, 2021, 09:59:05 am
content: Hi thereI need help identifying the following seven segment display. a Datasheet or an idea of how the interfacing works would be of great value. The display does not have the decimal points. Two daisy chained shift registers shifts a 11 bit value into the display.I know this is a long shot.I need to control the display and buttons from a micro controller. Any handy info will be greatly appreciated.(I know the connection of the two leds is wrong,will fix it later)regards

author: coromonadalix
author_rank: Super Contributor
timestamp: March 12, 2021, 03:27:11 pm
content: seems a common anode dual display, show us the solder side please

author: retiredfeline
author_rank: Frequent Contributor
timestamp: March 12, 2021, 09:59:16 pm
content: Any IDs on the side of the display?

author: Ario
author_rank: Regular Contributor
timestamp: March 14, 2021, 01:43:33 pm
content: Sadly nothing useful, except production serials. No use google it, I tried.Thanks anyway.

author: Ario
author_rank: Regular Contributor
timestamp: March 14, 2021, 01:45:03 pm
content: Thanks for trying.

author: mariush
author_rank: Super Contributor
timestamp: March 14, 2021, 04:34:46 pm
content: You could sort it out using a regular multimeter in diode mode.It's most likely a multiplexed display, which means only one digit is displayed at any time... So one digit is "enabled" and the segments are turned on, then a delay happens, then digit is disabled and the other digit is enabled and the segments for that digit are turned on or off.So you have 7 segments in a digit, and you have 2 digits, which means you'll have 7 or 8 pins for the segments and 2 pins one for each digit (common anodes or common cathodes)This display may have 8 pins for the segments even though there's 7 segments in a digit, reusing the footprint, keeping it same as the displays with the dot present. On this, the pin for dot may simply not be connected to anything.I'm looking at the second picture you uploaded and I see pin 2 not connected to anything, and I see 7 pins each with a resistor ... those are your segments ... they're even saying IC1_A, IC1_B and so on...I also see pin 5 and 10 labeled Q1_C and Q2_C .. those enable or disable the digit.So connect pin 5 to ground and send some voltage on the 7 pins and you'll enable the segments for one digit.Connect pin 10 to ground and send some voltage on any of the 7 pins and you'll enable various segments.This would make the display common anode (the 7 segments, anodes, are common to the 2 digits).\With multimeter in diode mode, put red probe on any segment pins and black probe on 5 or 10 and segment should light up (if your multimeter gives enough current)

author: Ario
author_rank: Regular Contributor
timestamp: March 14, 2021, 06:53:30 pm
content: Thanks so much, I will do what you suggested and report the progress I made.
Identifying ic help - Page 1
Forum section: electronics / projects

author: Ericho
author_rank: Regular Contributor
timestamp: January 19, 2014, 03:36:43 pm
content: Hi,Could use some help in identifying 2 components.1 28dip ic and 1 3wire potted astec part (see picture attached)thanksEric

author: johnboxall
author_rank: Unknown
timestamp: January 19, 2014, 11:46:40 pm
content: What did you pull the parts out of? A timing device?With regards to the IC, the only thing I can find that matches the pin count and model number is the Intersil ICM7045.http://html.alldatasheet.com/html-pdf/337253/INTERSIL/ICM7045/3894/10/ICM7045.html

author: amyk
author_rank: Super Contributor
timestamp: January 20, 2014, 06:39:40 am
content: Electronic Arrays, Inc. EA7045, week 29 1974The EA7055 was a calculator chip, so that one may be from a similar series.

author: IO390
author_rank: Regular Contributor
timestamp: January 20, 2014, 05:06:51 pm
content: The astec part is likely a buck boost converter.I remember pulling one out of an old Commodore calculator and my dad said that told me that it was a buck boost.

author: calexanian
author_rank: Super Contributor
timestamp: January 20, 2014, 10:20:33 pm
content: Hey! There is a dimes worth of gold right there! Gota love them vintage chips!

author: Ericho
author_rank: Regular Contributor
timestamp: January 21, 2014, 12:45:09 pm
content: QuoteI pulled it of an ancient DIY project I found in a junk box at a garage sale. It was just a diy pcb with a few parts. It seems to have a footprint for a long SIL package (7seg displays ?) connected to a row of transistors (digit select ?)The chip most likely drives a display, could be a digital clock, makes sense as a diy project in the 70'sFound no crystal or footprint for a crystal and caps on the pcb, could it be that the astec part in the picture is some sort of watch crystal ??It was bodged on the pcb.QuoteWould you need something like that to drive a 8 or 9 7sig display from those days ?I found a damaged 9 digit led display in the same junk box with very small segments
Identifying IC in VFD driver - Page 1
Forum section: electronics / projects

author: sahko123
author_rank: Frequent Contributor
timestamp: May 10, 2021, 04:12:23 pm
content: I'm trying to identify a controller chip on the back of a Keithley 7001 its a Motorola chip which reads SC405476FN I believe its some serial hub since the other chips are serial input 60V drivers.

author: Benta
author_rank: Super Contributor
timestamp: May 10, 2021, 07:22:43 pm
content: Motorola SCxxxxxx part numbers are to 99% mask-programmed microcontrollers. Very likely a 68HC05 type. No way to reverse engineer it or the firmware.

author: TheMG
author_rank: Frequent Contributor
timestamp: May 10, 2021, 07:23:12 pm
content: I suspect probably a custom ASIC, or more likely a mask ROM microcontroller, something like that.

author: sahko123
author_rank: Frequent Contributor
timestamp: May 11, 2021, 02:16:27 pm
content: thanks i feared that at this point rather than reverse engineering a way of controlling the micro i would cut it out of the equation and skip straight to the serial shift registers and decode them and get a pinout going for the vfd
Identifying IC - Page 1
Forum section: electronics / projects

author: BurnedResistor
author_rank: Regular Contributor
timestamp: December 01, 2015, 04:08:11 pm
content: Hey all,Sorry of this is the wrong category... Ill be more than happy to repost to the right one - just let me knowGot my hands on a cheap hexa-copter from china. When looking inside I found these two chips. I have searched through google and digikey and have not been able to find any info.Thanks for the help!

author: ChristofferB
author_rank: Frequent Contributor
timestamp: December 01, 2015, 04:48:58 pm
content: Well those are tricky.. IC1 seems to be labeled SWDAT, whatever that is.Are they sitting close/have bus wiring to something, indicating their function?-I think it's likely they're custom parts, unfortunately.--Christoffer

author: BurnedResistor
author_rank: Regular Contributor
timestamp: December 01, 2015, 05:09:40 pm
content: IC1 has some lines going to a wireless module labeled mosi and miso.. So i am guessing it is some micro, and why would you spin your own micro?

author: mark03
author_rank: Frequent Contributor
timestamp: December 01, 2015, 05:54:41 pm
content: I think the "F103" part is a Giga Device clone of the STM32F103.

author: Koen
author_rank: Frequent Contributor
timestamp: December 02, 2015, 03:18:04 am
content: U2 is Bosch BMI-055 inertial sensor.

author: BurnedResistor
author_rank: Regular Contributor
timestamp: December 02, 2015, 08:07:01 am
content: Yep that makes perfect sense!Thanks!
Identifying math operator in docs for LTC4416 - Page 1
Forum section: electronics / projects

author: ptrn
author_rank: Contributor
timestamp: February 11, 2022, 07:07:34 am
content: Hi allI'm having some real trouble identifying a math operator in a formula for LTC4416, see below. I can't figure out what the double vertical lines mean. I've tried various combinations but can't get the same result.Any takers?And here I thought my math skills were good enough for reading simple docs...

author: Ian.M
author_rank: Super Contributor
timestamp: February 11, 2022, 07:18:36 am
content: || is 'in parallel with'https://en.wikipedia.org/wiki/Parallel_(operator)

author: moffy
author_rank: Super Contributor
timestamp: February 11, 2022, 10:55:28 am
content: It is: a || b = (a*b)/(a+b)

author: Terry Bites
author_rank: Super Contributor
timestamp: February 12, 2022, 01:55:41 pm
content: How have you been manging up untill now?

author: Nominal Animal
author_rank: Super Contributor
timestamp: February 12, 2022, 04:20:51 pm
content: Quote from: Terry Bites on February 12, 2022, 01:55:41 pmFunny, that's exactly what I was going to ask you.

author: Benta
author_rank: Super Contributor
timestamp: February 12, 2022, 09:31:49 pm
content: Quote from: Terry Bites on February 12, 2022, 01:55:41 pmhttps://www.urbandictionary.com/define.php?term=Manging*until

author: ptrn
author_rank: Contributor
timestamp: February 12, 2022, 09:34:09 pm
content: Hah, of course! Now that I know I'm embarrassed that I didn't catch that.Thanks everyone
Identifying origin of messages on CANBUS - Page 1
Forum section: electronics / projects

author: zzattack
author_rank: Regular Contributor
timestamp: February 26, 2020, 11:55:02 am
content: I've got a CAN bus with, say, 3 nodes A, B & C, and I'm trying to emulate, say, device C.First step in doing so would be to understand C's behavior, and therefore I want to isolate/identify messages originating from this node C. It's possible for me to intercept bus wiring at arbitrary locations, but I am not able to hook up to transceiver ICs without destroying the node in the process, so that's a last resort. Simply removing C from the bus and see what disappears does not help, as the other nodes are influenced by that. Is there a way to determine message origin on a bus like that?Alternatively, by intercepting the bus wiring to C and putting a gateway in between both ends, I could control what comes in and goes out of C. Is that a reasonable way of going about this, or perhaps there's more effective approaches?

author: langwadt
author_rank: Super Contributor
timestamp: February 26, 2020, 02:18:01 pm
content: Quote from: zzattack on February 26, 2020, 11:55:02 amstick a small resistor on the lines from C ? The voltage on C then ought to be slightly higher for messages from C

author: capt bullshot
author_rank: Super Contributor
timestamp: February 26, 2020, 03:09:41 pm
content: You could try to build a CAN bus externder using one of these (or maybe even two simple CAN transceivers) to separate C from A and B:https://www.onsemi.com/pub/Collateral/AMIS-42770-D.PDFIt's quite a long time ago I've used that chip, so I don't remember if it would fit your needs, please read the datasheet on your own to determine this.

author: David Hess
author_rank: Super Contributor
timestamp: February 27, 2020, 07:43:08 pm
content: Quote from: langwadt on February 26, 2020, 02:18:01 pmThat could be made to work by detecting the direction of the signal which is indicated by the direction of current flow.
Identifying part in handheld transmitter - Page 1
Forum section: electronics / projects

author: pipingmike
author_rank: Newbie
timestamp: August 15, 2023, 03:12:43 pm
content: Hello,I am recycling an old handheld door buzzer in a project of mine and am familiarizing myself with its internals. It is from Linear Corp, model DXT-23, with part number SNT00377. It operates at 315MHz at 3.3 volts from two 2032 batteries. I have come across this RFM module where I cannot find a data sheet for it and websites that appear to be selling it do not have pictures of it to confirm it is the same part I am looking at. I have emailed support of who I think is the manufacturer (https://www.rfmi.co/) is and they do not have the part number in the system. Any help is appreciated.Bonus: If possible can anyone verify the value of this inductor? I have a rinky dink plastic caliper to measure the length and diameter. It's measurement were:N: 10Diameter: 2mmWire thickness: <1mmlength: 4.5using a calculator I got .0072 micro H and noticed standard is .1 uH, if I tweak diameter to 2.4mm I get around that value. Let me know if you think .1uH is a good bet.Here is Imgur Album with related photos (Board Overview, RFM up close, Inductor up close, board info, rinky dink caliper)https://imgur.com/a/WYPXCOqThank you

author: floobydust
author_rank: Super Contributor
timestamp: August 15, 2023, 04:41:28 pm
content: The TO-39 metal can is a common 315MHz SAW resonator. Nowadays they are smaller SMT and even using a PLL and crystal oscillator with an IC. You can get bushels of 315MHz TX boards on eBay or Aliexpress.

author: wasedadoc
author_rank: Super Contributor
timestamp: August 15, 2023, 07:06:30 pm
content: Quote from: floobydust on August 15, 2023, 04:41:28 pmMany of those boards are made in 315 and 433 MHz versions. If going that route be sure to select the 315 model.
Identifying  power button - Page 1
Forum section: electronics / projects

author: grimmjaw
author_rank: Regular Contributor
timestamp: December 01, 2017, 01:42:48 am
content: Hi everyone,In Dave latest video (EEVblog #1043 - Mailbag), there is a product (Pixel) with a power button.Does anyone know the part n8umber for the button.Been looking for it .Thanks

author: Buriedcode
author_rank: Super Contributor
timestamp: December 01, 2017, 01:52:43 pm
content: I haven't seen the video but looks like its just a button cap over a tactile switch?

author: grimmjaw
author_rank: Regular Contributor
timestamp: December 02, 2017, 06:58:00 am
content: It's exactly that, tactile switch with button cap.I trying to find exactly that in standard distributor (Digikey, E14, etc) but no luck.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: December 02, 2017, 08:36:34 am
content: Just bought 5 of them, different colors.https://www.banggood.com/12V-4-Pin-Led-Metal-Push-Button-Switch-Momentary-Power-Switch-Waterproof-p-1182049.html?utm_design=41&utm_source=emarsys&utm_medium=Shipoutinform171129&utm_campaign=newsletter-emarsys&utm_content=Winna&sc_src=email_2671705&sc_eh=dd41de46a711d4e41&sc_llid=73366&sc_lid=104858042&sc_uid=GFPB6Ooij5&cur_warehouse=CNCheers!

author: grimmjaw
author_rank: Regular Contributor
timestamp: December 03, 2017, 04:30:32 am
content: Can it be used without the outer ring?I really like the 'look' of power button in the video

author: Buriedcode
author_rank: Super Contributor
timestamp: December 03, 2017, 02:50:58 pm
content: https://www.aliexpress.com/cheap/cheap-led-tact-switch-cap.htmlSome of those look like promising candidates - as to the quality, who knows on ali.
Identifying SerDes Eye Diagram diagnostic data - Page 1
Forum section: electronics / projects

author: lorenz
author_rank: Newbie
timestamp: November 27, 2022, 07:57:11 pm
content: I have a 10Gbps fiber switch, using 10Gbase-R (10.3125Gbaud 64/66 line code). Deep in the vendor debug code (which is available as the switch uses GPL software) there is an "eye monitor" which takes a number of frames (1..16) and outputs (per frame) 64x64 (named x and y) 16 bit numbers. I wrote a small tool which takes this data and generates 64x64 PNG images using Google's Turbo color map (https://ai.googleblog.com/2019/08/turbo-improved-rainbow-colormap-for.html). I also restricted the range to between 48*1024 and 64*1024 as no values fell outside that range. The resulting images are attached.Now the question: What am I looking at? Definitely not a conventional eye diagram, it doesn't have the right shape for that. It's also very noisy in the dark regions. I also took all 5 frames I was measuring and averaged them, which makes the output a lot clearer but doesn't really help me figure out what it is. The link quality should be pretty good, it's a 3m fiber link with <5cm of PCB trace to the receiver.It would be very cool to know how to interpret this data and to be able to use it to debug potential problems with links.Thanks!
How to identify both sides of a 3 layer ESD mat - Page 1
Forum section: electronics / projects

author: abobbie
author_rank: Newbie
timestamp: May 06, 2025, 09:37:20 pm
content: Following the advice of thisthread from 2015I purchased from canvu0_0 both a 3 layer and 2 layer esd mat for my work surface, (3 layer for the entire work area, 2 layer for soldering and then moving out of the way)due to the large mat I opted to install the toothed mounting point myself so I could position it near where I'm going to have my common ground tap in the centre of the work area.Unfortunately I am unsure how to identify the top layer of the 3 layer mat as both sides are grey. I can purchase one of theHZR Model-100 surfaceresistance meters to check, however I'm not sure if both the top and bottom would have similar static dissipative properties.Is there sort of a universal rule for textures of 3 layer mats or am I going to have to run some tests to determine this?Update(copied from my reply below): I got confirmation from the seller, the top side is in fact the thicker side with the "Elephant Skin" texture, and the bottom side is the thinner layer with the "mesh" texture embedded inside it. if I ever get a chance I'll test both sides resistance with a proper meter.One side is slightly thicker than the other and has an "Elephant skin" like texture, while the other is almost impossible to view from a cross section of the mat and has a silky ultra fine mesh texture. (images attached) Unfortunately the manufacturers datasheet doesn't have a high enough resolution image to confirm.

author: Benta
author_rank: Super Contributor
timestamp: May 06, 2025, 09:58:35 pm
content: Well, logic says that the "durable" side (elephant skin) is the top. It's a working surface that needs to be resilient.

author: thm_w
author_rank: Super Contributor
timestamp: May 07, 2025, 12:44:09 am
content: Yeah textured is the top, probably they are selling something like this:https://www.descoindustries.com/pdf/TDTYPEZ2.PDFWhich isn't super clear either, but does imply the top is "light embossing".If you are using hot air test the mat before actually soldering on it, it may still burn and discolor even though they call it "high temperature". I end up using silicone mat.

author: abobbie
author_rank: Newbie
timestamp: May 07, 2025, 01:18:31 am
content: Quote from: thm_w on May 07, 2025, 12:44:09 amseems even less clear when it looks like the ultra fine mesh "smooth" surface is pictured herehttps://a.media-amazon.com/images/I/81H0AuhlJkL._AC_SX679_.jpg

author: abobbie
author_rank: Newbie
timestamp: May 12, 2025, 01:45:50 am
content: I got confirmation from the seller, the top side is in fact the thicker side with the "Elephant Skin" texture, and the bottom side is the thinner layer with the "mesh" texture embedded inside it. if I ever get a chance I'll test both sides resistance with a proper meter.
Identifying some CCCP Transformers - Page 1
Forum section: electronics / projects

author: induzer
author_rank: Contributor
timestamp: September 16, 2018, 05:32:34 pm
content: Hi there,I just bought a display unit with nixies for a short wave transceiver set for telex recon from formerly CCCP.Before I take it apart, using it as desk clock, I record the schematics. The unit seems to be rarely documented.All is recorded so far, but the power supply. It uses self oscillating circuits for its 2 power rails.Sadly the 2 transformes are perfectly potted, and I haven't a clue how the inductors are arranged inside.... Someone an idea ?Cheers,induzer

author: SeanB
author_rank: Super Contributor
timestamp: September 16, 2018, 06:26:51 pm
content: I assume the 2 transformers are not the same part, so pins 1 and 2 are the primary winding on the top one. Pins 6 and 7 are the feedback winding, and pin 6 is the other side of the feedback winding for regulation. Pin 7 is a common on the secondary, and it is part tapped at pin 8 for voltage sense and pin 3 is the high voltage winding.Bottom one pins 1 and 2 are primary again, pin 5 is the common for the secondaries, and feedback is from pins 4 and 3. Secondary is pin 5 and 6, with voltage there used to regulate the oscillation on the transformer.Bottom one i guess supplies 5V at around 1A, top is 160v at 10mA or so.

author: exe
author_rank: Unknown
timestamp: September 17, 2018, 06:34:32 am
content: Do you have photos of these transformers? There should be some marking...

author: induzer
author_rank: Contributor
timestamp: September 17, 2018, 09:30:47 pm
content: ...some photos

author: exe
author_rank: Unknown
timestamp: September 17, 2018, 10:24:37 pm
content: I didn't find anything about the transformers. Can you please show photo of front panel with logo and model name?

author: induzer
author_rank: Contributor
timestamp: September 17, 2018, 10:43:30 pm
content: Its the third module from the top.The type is R1250 M/BManufactured by ML - Mechanikai Laboratórium, Budapest.http://militaermuseum-anhalt.de/images/stories/SpezAkltechnik/Steckbriefe/R1250/r1250-001.jpg

author: Bud
author_rank: Super Contributor
timestamp: September 17, 2018, 11:47:59 pm
content: Holy cow, did you get the whole station or just the nixie module?

author: induzer
author_rank: Contributor
timestamp: September 18, 2018, 06:27:28 pm
content: ... regretfully only the nixie module

author: Frank65
author_rank: Newbie
timestamp: October 04, 2025, 12:25:53 pm
content: Hallo,ich habe in deinem Blog von 2019 Nixiclock - greeting from UdSSR gelesen, dass du dich mit dem Nixon Einschub aus dem Empfangsgestell R-1250M-1 beschäftigt hast. Ich suche für diesen Einschub dringend die Schaltungsunterlagen.Kannst du mir helfen?Vy73 de Frank
Identifying specific 4mm banana PCB terminals - Page 1
Forum section: electronics / projects

author: owiecc
author_rank: Frequent Contributor
timestamp: September 24, 2014, 09:09:08 am
content: Do you know where to buy this type of connectors? PCB mounted without any plastic around. Ideally something that can be surface mounted or mounted in a single big hole.PS. How to insert an attached picture into the post body?
Identifying the LCD - Page 1
Forum section: electronics / projects

author: Spirit
author_rank: Newbie
timestamp: October 21, 2013, 05:49:48 pm
content: Hello there, fellow EEVBlog forum users!I've been digging out random phones, and i found this:http://puu.sh/4VMzG.JPGhttp://puu.sh/4VMxS.JPGhttp://puu.sh/4VMBu.JPGhttp://puu.sh/4VMCE.JPGIt's a 200x400 WQVGA display, but i have no idea on how to drive it, or what it is at all.Can you guys help me identifying & bringing it back to life again? I really want to use it in my AVR scope project, because the closest thing we've got here in Belarus is ~32AUD, and it doesn't look that good, especially for the price.

author: bilko
author_rank: Frequent Contributor
timestamp: October 21, 2013, 09:43:02 pm
content: Please re-scale your images!They are huge and out of focus.

author: tom66
author_rank: Super Contributor
timestamp: October 21, 2013, 10:31:55 pm
content: The LF logo is exclusive to Samsung and early Chimei LCD panels.

author: Spirit
author_rank: Newbie
timestamp: October 22, 2013, 05:13:32 am
content: Quote from: tom66 on October 21, 2013, 10:31:55 pmDo you have any idea on how they are driven?

author: tsmith35
author_rank: Frequent Contributor
timestamp: October 22, 2013, 06:57:24 am
content: Take a lookhere. You'll probably want to use Google Translate or similar. Search the page for "LCD_S5230.zip". Should be of some help. I believe the LCD driver is PN S6D04D1.

author: Spirit
author_rank: Newbie
timestamp: October 22, 2013, 08:02:25 am
content: Quote from: tsmith35 on October 22, 2013, 06:57:24 amNah, i speak russianThanks buddy, that's what i was looking for!EDIT:So, i found abit more info on it, in case anyone wants.
Identifying this diode - Page 1
Forum section: electronics / projects

author: viktor18
author_rank: Regular Contributor
timestamp: June 09, 2017, 09:36:30 pm
content: I need some help on identifying this diode, unfortunately it has been shorted and need a replacementThe marking on it says: MK 7CE

author: DmitryL
author_rank: Regular Contributor
timestamp: June 09, 2017, 09:45:16 pm
content: Quote from: viktor18 on June 09, 2017, 09:36:30 pmLook to me as SMBG30A 33v TVS

author: viktor18
author_rank: Regular Contributor
timestamp: June 09, 2017, 09:58:41 pm
content: How would I be able to confirm?

author: Nusa
author_rank: Super Contributor
timestamp: June 09, 2017, 10:57:21 pm
content: To confirm, since he gave you a part number, is to find the datasheet for that part number.To find it in the first place:The device code is "MK", the 7C is a date code (year ending in 7, december), E not sure...maybe production facility.Google "diode MK mark", and that'll lead you to a suppliers datasheet that includes it, such as:https://www.vishay.com/docs/88456/smbg.pdf

author: David Hess
author_rank: Super Contributor
timestamp: June 09, 2017, 11:23:31 pm
content: Are you sure it is not in parallel with L902? If it is in parallel with an inductor, then it will appear to be shorted when measured in the circuit.

author: viktor18
author_rank: Regular Contributor
timestamp: June 10, 2017, 10:47:29 am
content: Thanks for all your replies! I'm positive that the diode is shorted.I managed to find a replacement diode from the original part ( at least I hope so)withFor me it looks like a suitable replacement, but original part says Stand-off voltage 30v and the replacement says Reverse stand off voltage 30v.. What's up with that?

author: Nusa
author_rank: Super Contributor
timestamp: June 10, 2017, 11:23:26 am
content: Quote from: viktor18 on June 10, 2017, 10:47:29 amSame thing, just labeling variation. Below the 30V standoff voltage, reverse flow is blocked, letting no more than 1 microamp of leakage through.

author: viktor18
author_rank: Regular Contributor
timestamp: June 10, 2017, 11:25:54 am
content: Quote from: Nusa on June 10, 2017, 11:23:26 amAlright thanks! I'll give the replacement a try.
Identifying two TI SMD chips - Page 1
Forum section: electronics / projects

author: canadaboy25
author_rank: Regular Contributor
timestamp: March 01, 2023, 01:43:17 am
content: Hi all,Hoping someone here can help me identify these two 14 pin TI chips. I have searched for hours and cannot come up with anything that makes sense based on the visible traces.The board is from a datavideo time base corrector. No service information is available for it. The other chips on the board seem to have date codes from 1999 if that helps at all.

author: MasterT
author_rank: Frequent Contributor
timestamp: March 01, 2023, 02:01:43 am
content: https://www.ti.com/lit/gpn/sn74f04

author: canadaboy25
author_rank: Regular Contributor
timestamp: March 01, 2023, 03:19:58 am
content: And I suppose the other chip is a SN74F32. I completely ignored the "F04" and "F32" thinking they were date codesThanks a bunch!
Idle Speed Control (ISC) Valve. Stepper motor with ESP32 - Page 1
Forum section: electronics / projects

author: tru3533
author_rank: Regular Contributor
timestamp: June 23, 2023, 01:09:02 am
content: I have a Idle Speed Control (ISC) Valve from a car.I would like to control the valve with ESP32 on a projectLooks like it's unipolar (B1 and B2 is together inside)What do you think? what would be the goto chip? with protection?

author: moffy
author_rank: Super Contributor
timestamp: June 23, 2023, 02:57:20 am
content: The device is a unipolar stepper motor it is important to know what its rated current is to chose the correct driver. The DRV8805:https://www.ti.com/lit/ds/symlink/drv8805.pdf?ts=1687488873972&ref_url=https%253A%252F%252Fwww.google.com.au%252Fmight be suitable but you will need to check the current rating.

author: tru3533
author_rank: Regular Contributor
timestamp: June 23, 2023, 03:09:28 am
content: Thank you moffy, looks like a good choice1.5 amp. I will do some bench testing.
IEC  14 Connector mod for the FX-888 - Page 1
Forum section: electronics / projects

author: stewart4t2
author_rank: Newbie
timestamp: February 17, 2013, 10:02:58 pm
content: Hello all!I was inspired to open up the Hakko once I saw the LED mod (Thanks Dave!) in order to correct another personal annoyance of mine - not just withthisiron, but many corded objects.I prefer to be able to remove a cord from a piece of electronics to allow simple organization, whether it be storage or arrangement on your workbench! So, in my perfect world, most devices would have an IEC 14 panel connector, and I can simply keep some standard computer cords around to satisfy my plug needs. I can't seem to get rid of them all!So begins the show! Don't mind my dremel skills - they needpolished.

author: ftransform
author_rank: Frequent Contributor
timestamp: February 17, 2013, 10:49:28 pm
content: I like this mod and I may do this myself because whenever I need to use the soldering iron off my bench I find myself having to climb down and figure out which out of 50 cables is connected to it.Every piece of test equipment (other then my hakko and old agilent supply) has IEC 14 connectors...What cons are there to them?

author: ivan747
author_rank: Super Contributor
timestamp: February 18, 2013, 12:08:15 am
content: Wow, that was a very tight fit. Your dremel skills are 3 timer better than mine.What is that blue stuff, I guess it's some kind of silicone?

author: IanB
author_rank: Super Contributor
timestamp: February 18, 2013, 01:10:25 am
content: Quote from: ftransform on February 17, 2013, 10:49:28 pmThey increase the cost of the device that uses them...
IEC EN 61000-4-4,5 Surge/Transient testing - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: March 29, 2018, 06:31:09 pm
content: At work we have a Keytek ECAT system for EMC testing, the problem is that is "booked" for use half the time I need it.For the -4 and -5 tests (Electrical fast transient/burst immunity, Surge immunity) is it possible to build a suitable test circuit for preliminary testing?Any links to circuits?

author: PartialDischarge
author_rank: Super Contributor
timestamp: March 29, 2018, 07:08:47 pm
content: This is the fastest way:Use a kitchen magiclick piezo lighter. Take out the metal cover and leave the pointy spark conductor visible. With the distance to the equipment you can control more or less the applied voltage. If a devices passes this test it will do fine in the cert lab.Source: experience

author: jeffreyjames44
author_rank: Contributor
timestamp: September 18, 2018, 07:23:18 pm
content: I may be able to find one laying around... which ECAT module are you attempting to build a circuit for?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 19, 2018, 03:22:43 am
content: You can use a piezo lighter for -4-2 precomp testing, but it is in no way a substitute for the correct series of tests, especially the ones with coupling planes, or air discharge.EFT is a rapid sequence of ESD-like pulses transmitted down a cable. You could perhaps calibrate a relay contact inductive switching circuit to approximate it, that being the primary origin of that hazard in-the-wild.Surge isn't easy to do without some big thyristors. The network isn't hard, but charging, switching and coupling it, is.Also, OP has probably solved their scheduling issue, one way or another, in the past 6 months...Tim
IEC 62368 Solid insulation test voltage confusion - Page 1
Forum section: electronics / projects

author: AndrewHodgson
author_rank: Contributor
timestamp: February 01, 2021, 02:23:28 pm
content: Hi,I'm confused over the solid insulation test voltage in IEC 62368 for 120V RMS mains. I read this article that said it's 2KV but I read the standard differently. Table G9 seems to agree with the article but I can't see how they got there.https://incompliancemag.com/article/iec-62368-1-ac-mains-port-protection-component-requirements/"Clause 5.4.9.1, solid insulation, is a three-way choice. One has to select the appropriate test voltage values from Table 25 transient voltages, Table 26 peak of the working voltages and recurring peak voltages and Table 27 temporary overvoltages. The highest peak value of all three voltages becomes the GDT test voltage, which is applied as either a peak AC or a DC voltage. For example, 120 V AC mains results in test voltage values of 1.5 kV peak (overvoltage category II), 243 V peak and 2 kV peak. Similarly, 230 V AC mains gives test voltage values of 2.5 kV peak (overvoltage category II), 465 V peak and 2.5 kV peak. Table 27 has the highest voltage test value of 2 kV dc or 1.41 kV ac for 120 V ac and Tables 25 and 27 are equal highest at 2.5 kV dc or 1.77 kV ac for 230 V ac."I read 5.4.2.2 and get a peak working voltage of 2000V. I then use table 27 and get a test voltage of 2.6KV using the peak work voltage. I assume Y2 caps aren't ok for this test voltage.What am I doing wrong?TIA
IEC mains sockets. Is there a set of standard cutout sizes? - Page 1
Forum section: electronics / projects

author: wilfred
author_rank: Super Contributor
timestamp: April 15, 2018, 06:34:45 am
content: /.

author: eliocor
author_rank: Unknown
timestamp: April 15, 2018, 06:55:23 am
content: Yes, you can reduce your long link to:https://www.ebay.com.au/itm/282826596778The rule is very simple:https://www.ebay.com.au/itm/followed by the item number (you'll find it in your long link)

author: CopperCone
author_rank: Super Contributor
timestamp: April 15, 2018, 02:33:53 pm
content: ones with fuses and filters require a slightly larger cutout.

author: SeanB
author_rank: Super Contributor
timestamp: April 15, 2018, 07:33:39 pm
content: There are punch sets that fit a large number of sockets, that are almost a demi official standard, but pretty much every one of those sockets from various manufacturers ( aside from a great number of the snap in ones, which fit the same punched hole ) has some slight variability, mostly in the location of the mounting holes for the screws to hold it in the panel, though many will fit in the same large cut out almost interchangeably.
IEC testing protocol for adding a new PSU  - Page 1
Forum section: electronics / projects

author: am1
author_rank: Contributor
timestamp: August 26, 2024, 05:21:46 pm
content: Hi All,I have a controls cabinet for a device that follows IEC 60601-1 and 60601-2 for medical devices. I need to add a 24V 2-wire actuator for a mechanical project for a locking mechanism (the project is not related to patient safety, not holding them up, etc.). The current 24V 408W PSU I am using in cabinet is at capacity; when I use it to power my 24V dpdt relay for my actuator and energize it, the entire PLC controller the relay is wired to reboots due from overcurrent I assume. I want to add an additional 24V PSU to use solely for this new actuator and relay system, but have concerns that adding an additional PSU and actuator will be cause for IEC retesting which I would like to avoid. The other 24V psu and actuators I am already using in my current device have been marked as critical components and any changes to them will likely require either documentation updates to IEC or require the device be sent for retesting. This new system and PSU is relatively isolated from the rest of the controls and the actuator will not be affecting patients or their safety directly. Does anyone have experience with this kind of testing or having insight on what is cause for retest vs. what is not? Thanks!
IEC320 C13 Mating/Insertion Cycles - Page 1
Forum section: electronics / projects

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: March 03, 2020, 01:31:54 am
content: Hi AllDoes anyone know what is the typical number of mating/insertion cycles for an IEC320 C13 connector?I tried having a look through datasheets but no one mentions this. Wiki says to refer to IEC 60320-1 but can't a pdf of this standard anywhere

author: bjbb
author_rank: Contributor
timestamp: March 04, 2020, 05:39:43 pm
content: Depending on the particular test and the test conditions - between 10 and 3000 insertions.