hybridfree/eevblog-posts huggingface dataset:
what are these plugs please. - Page 1
Forum section: electronics / beginners

author: Simon
author_rank: Unknown
timestamp: October 16, 2012, 09:50:25 am
content: Hello good people, I am trying to find out what type of plugs the attached pictures are so I can get replacements.The white one is an amp one we know

author: Kremmen
author_rank: Super Contributor
timestamp: October 16, 2012, 09:59:16 am
content: The bottom 2 look like normal Molex power connectors but can't say what specific type. Scanning Mouser and Digikey you should come up with the product type codes though.

author: Simon
author_rank: Unknown
timestamp: October 16, 2012, 10:23:30 am
content: well it has AMP stamped on it somewhere

author: Monkeh
author_rank: Super Contributor
timestamp: October 16, 2012, 02:10:00 pm
content: Quote from: Simon on October 16, 2012, 10:23:30 amTheir site has a fantastic search facility. Look up 1-350345-0.

author: Simon
author_rank: Unknown
timestamp: October 16, 2012, 02:11:55 pm
content: ok will do, I asked as other had searched to no avail they say. Any ideas on the other ?

author: Monkeh
author_rank: Super Contributor
timestamp: October 16, 2012, 02:14:49 pm
content: Quote from: Simon on October 16, 2012, 02:11:55 pmLooks similar to their economy connector, but not quite the same. Will check Molex later. Usually one of the two will make them.

author: Simon
author_rank: Unknown
timestamp: October 16, 2012, 03:16:45 pm
content: Quote from: Monkeh on October 16, 2012, 02:10:00 pmI keep ending up on the TE website, do they make them or are AMP a company of their own ?

author: Monkeh
author_rank: Super Contributor
timestamp: October 16, 2012, 03:22:03 pm
content: Quote from: Simon on October 16, 2012, 03:16:45 pmBeen owned by TE for 13 years now.

author: Monkeh
author_rank: Super Contributor
timestamp: October 16, 2012, 03:40:38 pm
content: What's the pitch on those black ones?

author: Simon
author_rank: Unknown
timestamp: October 17, 2012, 07:06:05 am
content: Quote from: Monkeh on October 16, 2012, 03:40:38 pmIt's 3mm, note that both rows seem to be the same pin, at the back there is just the one hole with the crimp in it.

author: Monkeh
author_rank: Super Contributor
timestamp: October 17, 2012, 01:26:39 pm
content: It's a single row connector.I can't seem to find a match for that one, sorry.

author: Simon
author_rank: Unknown
timestamp: October 17, 2012, 02:01:26 pm
content: Quote from: Monkeh on October 17, 2012, 01:26:39 pmwell thanks for trying, they are most unusual
What are these solder pins called? - Page 1
Forum section: electronics / beginners

author: PeteAU
author_rank: Contributor
timestamp: March 30, 2013, 08:49:24 am
content: Hi All,I'm trying to repair an old board that has some broken pins. They are 0.1" spacing, solder on one side and plugs into a standard DIP socket on the other. They are similar to machined IC socket pins, except a little longer.Can someone help identify them? What exactly are they called? I tried looking through farnell/futurlec/ebay but can't find a good match.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 30, 2013, 10:48:05 am
content: "turned pin" should get you to the right section

author: digsys
author_rank: Unknown
timestamp: March 30, 2013, 10:59:35 am
content: Haven't seen those exact ones, but are these what you mean? One end fits into a machine socket, other end used to solder to a PCB.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 30, 2013, 12:26:45 pm
content: Probably easiest to get standard length ones as above, and stack up using sockets. The sockets also give you a more easily replaceable unit when they get damaged again.

author: DaveW
author_rank: Frequent Contributor
timestamp: March 30, 2013, 04:05:08 pm
content: Just go to the Samtec website and you can specify the exact length you want,http://www.samtec.com/connectors/standard-board-to-board/100-inch-square-post/terminals.aspxThey make all their connectors to order, so no worries about minimum order quantities or suchlike
what are these tabs - Page 1
Forum section: electronics / beginners

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: May 07, 2019, 07:05:06 am
content: Going to obtain a DO-5 diodehttps://www.digikey.com/product-detail/en/VS-70HFR120/70HFR120-ND/352028and it comes with everything but the washer with solder tab hole found in listinghttps://www.ebay.com/itm/123138968087but I don't need the other things in that kit. Trying to find that solder washer on Digikey but not sure if they even sell them individually or if they even carry them.

author: MarkF
author_rank: Super Contributor
timestamp: May 07, 2019, 08:10:13 am
content: Can't you use a wire ring connector with a crimped wire?https://www.mouser.com/ProductDetail/Panduit/PN10-14RX-L?qs=%2Fha2pyFaduhpPQfk8K%252BvlCbio5VJTI0R7L0205oB1%252Bk%3D

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: May 07, 2019, 10:13:25 am
content: I have many of those but Id like something with more surface area as those in the ebay listing.

author: wraper
author_rank: Unknown
timestamp: May 07, 2019, 10:20:59 am
content: https://www.digikey.com/products/en/connectors-interconnects/terminals-solder-lug-connectors/401

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: May 07, 2019, 10:25:23 am
content: Quote from: wraper on May 07, 2019, 10:20:59 amAlready been thru those, none fits an M6 stud.

author: wraper
author_rank: Unknown
timestamp: May 07, 2019, 10:32:22 am
content: This one has 6.35 mm hole.https://www.digikey.com/product-detail/en/keystone-electronics/4712/36-4712-ND/316279

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: May 07, 2019, 10:54:42 am
content: Quote from: wraper on May 07, 2019, 10:32:22 amThe one without any data input into their fields, will obtain these. I typically use filters to find items.
What are these things found inside HDDs? - Page 1
Forum section: electronics / beginners

author: aix
author_rank: Regular Contributor
timestamp: February 08, 2020, 06:42:26 pm
content: I've been taking apart various HDDs. I'd be curious to know what these things are:

author: Benta
author_rank: Super Contributor
timestamp: February 08, 2020, 06:47:42 pm
content: Shock sensors. If the HDD is dropped or hit, they detect the shock, making the controller retract the head immediately to avoid damage to the surface of the disk.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 08, 2020, 06:51:19 pm
content: Activated charcoal acting as humidity absorbent and air filter.

author: edpalmer42
author_rank: Super Contributor
timestamp: February 08, 2020, 06:58:26 pm
content: I think they're air filters.Except for the newest high capacity drives (~10 TB) which are full of helium, all hard drives have a breather to equalize air pressure so the cover doesn't bulge down and touch something. The breather has to be well filtered so that nothing but clean air is allowed in.I've also seen air filters that are in the path of the 'wind' that the spinning platters create. These catch and hold any particulate matter that might be created by, for example, a small head slap. By capturing this material, it helps to prevent a small problem from growing into a fatal one.Ed

author: aix
author_rank: Regular Contributor
timestamp: February 08, 2020, 07:20:45 pm
content: Quote from: edpalmer42 on February 08, 2020, 06:58:26 pmThis makes total sense, thank you. I've just looked, and there's indeed a hole on the outside of each of the enclosures right where the filter is.

author: mikerj
author_rank: Super Contributor
timestamp: February 08, 2020, 07:43:08 pm
content: Quote from: Benta on February 08, 2020, 06:47:42 pmThe accelerometers used for this function are small IC's soldered onto the main controller PCB.

author: ArthurDent
author_rank: Super Contributor
timestamp: February 08, 2020, 07:56:52 pm
content: Definitely an air filter to allow clean air to flow to equalize pressure inside the drive.
What are these? - Page 1
Forum section: electronics / beginners

author: deandadnaed
author_rank: Contributor
timestamp: April 07, 2019, 04:55:21 am
content: Hi! I’m trying to find the tracks within a PCB. But I’ve got no idea what are these components.Does anybody know what are they?Enviado desde mi iPhone utilizando Tapatalk

author: OwO
author_rank: Super Contributor
timestamp: April 07, 2019, 04:57:08 am
content: Potentiometer.

author: Brumby
author_rank: Unknown
timestamp: April 07, 2019, 06:50:14 am
content: Trim pots to be more precise.They are adjusted by a small flat blade screwdriver via the slot in the middle.From the numbers on them, the resistance of each are:103 = 10K ohm202 = 2K ohm503 = 50K ohmEdit:They are placed in circuits that need to be adjusted when they are first built and tested. Once adjusted, they should not need any further tweaking in normal service. Translation: Don't fiddle with them unless you know what you are doing and why.

author: Jwillis
author_rank: Super Contributor
timestamp: April 07, 2019, 06:56:57 am
content: Like Brumby says. But in addition The first 2 numbers times the multiplier. 0 = 1 , 1=10 ,2=100,3=1000,4=10000 ,5 =100000. So the top left is 10 times 1000 or 10000 ohms or 10K Ohms.The top right is 20 X 100 or 2KOhms and so on

author: deandadnaed
author_rank: Contributor
timestamp: April 07, 2019, 06:58:19 am
content: Thank you very much!Enviado desde mi iPhone utilizando Tapatalk

author: Brumby
author_rank: Unknown
timestamp: April 07, 2019, 06:59:38 am
content: If you're tracing out the circuit, the bottom two connections are fixed to each end of the resistance track. The third connection comes from the moving contact which is connected to the tag at the top.

author: digsys
author_rank: Unknown
timestamp: April 07, 2019, 08:40:06 am
content: ... and those look like a ceramic type, which are much higher quality / grade than the "standard" plastic types.

author: deandadnaed
author_rank: Contributor
timestamp: April 08, 2019, 05:27:36 am
content: Thank you. I’m trying to trace the circuit. I won’t be messing with the trim pots but I’ve measured them as they were set, just in case.Enviado desde mi iPhone utilizando Tapatalk

author: Smokey
author_rank: Super Contributor
timestamp: April 08, 2019, 11:04:02 am
content: For example (Tried to find pots that look like the ones in the pictures. Don't buy these specific ones, they are obsolete):https://www.digikey.com/product-detail/en/bourns-inc/3319P-1-102/3319P-102-ND/612867https://www.digikey.com/product-detail/en/panasonic-electronic-components/EVN-65AA00B23/K4A23-ND/6092
What are this two ICs? - Page 1
Forum section: electronics / beginners

author: frenky
author_rank: Unknown
timestamp: August 28, 2016, 07:48:15 pm
content: Could someone please help me with identifying this two ICs?First (Texas Instruments):62FD3XK G4LS00Second (Fairchild):PF8AKMM74HC14MThank you!

author: Rbastler
author_rank: Frequent Contributor
timestamp: August 28, 2016, 07:52:18 pm
content: I don't know waht the first one is, but the secon one is this IC :https://www.nxp.com/documents/data_sheet/74HC_HCT14.pdf.

author: wraper
author_rank: Unknown
timestamp: August 28, 2016, 07:53:56 pm
content: SN74LS00 from Texas instruments and MM74HC14 from Fairchild, can be replaced with any flavor of 74LS00 and 74HC14.

author: frenky
author_rank: Unknown
timestamp: August 28, 2016, 07:56:14 pm
content: Big thanks to both of you.
What are those "cuts" in the PCB? - Page 1
Forum section: electronics / beginners

author: vmallet
author_rank: Regular Contributor
timestamp: October 18, 2019, 12:56:05 am
content: In the pictures of a SMPS of a Blu-Ray player below there are three "cuts" in the PCB under three components. 1 is under something that could be an opto-coupler (IC102), 2 and 3 are under capacitors (C111, C102). I have seen these before and I don't quite understand their function. I've tried to google around but I don't know how to describe these things and I only get literature about through-holes, mounting holes, vias, air gap layers... none of which is relevant. Would love some info so I could go learn about them.Thanks!

author: thm_w
author_rank: Super Contributor
timestamp: October 18, 2019, 01:02:31 am
content: http://blog.optimumdesign.com/clearance-and-creepage-rules-for-pcb-assemblyhttps://www.eevblog.com/forum/projects/pcb-slotscutouts-when/

author: vmallet
author_rank: Regular Contributor
timestamp: October 18, 2019, 01:27:59 am
content: Quote from: thm_w on October 18, 2019, 01:02:31 amGreat thanks, exactly what I was looking for.
What are those tiny "press to attach" surface mounted PCB connectors called? - Page 1
Forum section: electronics / beginners

author: SolderSucker
author_rank: Regular Contributor
timestamp: November 11, 2017, 09:34:37 pm
content: As the title says - here's an example of one in this video:https://youtu.be/ETN97XOx4ZY?t=90Not sure about anyone else but these can be a real pain to clip together as you often can't see that you have them correctly aligned and it's too easy to push down and break one of the tiny retaining clips on each edge, or even one of the pin connections.

author: Mickster
author_rank: Contributor
timestamp: November 11, 2017, 11:05:45 pm
content: FPC connectors?https://www.google.com/search?q=apple+fpc+connectors&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiJ-Nje0LfXAhWM7SYKHZ01ABwQsAQINg&biw=1350&bih=618#imgrc=_

author: SolderSucker
author_rank: Regular Contributor
timestamp: November 12, 2017, 09:54:59 am
content: That's the ones - thanks!
What are those wires in that op-amp? - Page 1
Forum section: electronics / beginners

author: Voldemort127
author_rank: Newbie
timestamp: December 30, 2015, 12:09:28 am
content: Hello, I have a 'noob' question. I found a schematic for a power supply that uses the TL084 operational amplifier. My question is what are those additional wires on the bottom side of U2 going to RV1 (highlighted with red), and which pins of the TL084 should I connect them to?Here's the schematic:Any help or explanation is appreciated.

author: nugglix
author_rank: Regular Contributor
timestamp: December 30, 2015, 12:16:56 am
content: Given the pinout it is more likely that the TL081 is used.Check the datasheet, I'd say.

author: GabYoung92
author_rank: Regular Contributor
timestamp: December 30, 2015, 12:17:27 am
content: They are offset pins which are on the Chip just as 2,3,4,7,6.http://www.ti.com/lit/ds/symlink/tl082.pdfPage 1, 3

author: alsetalokin4017
author_rank: Super Contributor
timestamp: December 30, 2015, 12:43:52 am
content: Yep, the pinouts correspond to TL081 (8 pin DIP with single op-amp), not TL084 (14-pin DIP with 4 op-amps, no offset adjustments). The red wires connect to pins 1 and 5 of the TL081, for input offset adjustment. See the data sheet.

author: Voldemort127
author_rank: Newbie
timestamp: December 30, 2015, 01:01:59 am
content: Thank you, you've helped me a lot

author: Audioguru
author_rank: Super Contributor
timestamp: December 30, 2015, 01:37:33 am
content: In addition to many other errors in that circuit, the value of the 270k ohm resistor is much too high (it should be 1.5k) and it connects to the wrong voltage.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 30, 2015, 10:56:49 am
content: The offset adjustment circuit depends on the OP used. The more comon type is having the trimmer center connected to the positive supply and usally smaller values (e.g. 10-100 K).

author: SeanB
author_rank: Super Contributor
timestamp: December 30, 2015, 12:35:06 pm
content: Trim voltage reference depends very strongly on the particular opamp. Some are referenced to the positive rail, and others to the negative rail. The particular method is given in the opamp datasheet, so refer to that, especially if changing out the model of opamp. eg a LM741 has the offset referenced to the negative supply, while an OP07 has it referenced to the positive supply. If changing out the one to the other for some reason, like lower noise, improved popcorn noise and higher bandwidth, be aware that if you are using offset nulling on the original if you just drop in the other the offset null will effectively either burn out the input stage, if you have the offset at the one end with low resistance, or make the opamp not operate properly.
What area is Isola P96 material used for ? - Page 1
Forum section: electronics / beginners

author: Jessie Barry
author_rank: Newbie
timestamp: July 01, 2016, 05:59:45 am
content: What area is Isola P96 material used for ?

author: judyfromraypcb
author_rank: Newbie
timestamp: July 01, 2016, 06:05:47 am
content: I guess used for WIFI device

author: Erickben
author_rank: Contributor
timestamp: July 01, 2016, 06:09:41 am
content: You can see what's Isola P96 and it's application from here:http://www.isola-group.com/products/p96/

author: voltsandjolts
author_rank: Unknown
timestamp: July 01, 2016, 07:39:08 am
content: Polyimides offer better performance in high ambient temperatures, one such niche application is electronics used in oil wells or geothermal wells.The isola web page mentions military, so maybe avionics?

author: grimmjaw
author_rank: Regular Contributor
timestamp: July 02, 2016, 01:14:53 am
content: I used it for high ambient temperature enviroment
What automotive Chip is this (BFEAA IGD1100F) ? - Page 1
Forum section: electronics / beginners

author: HighVoltage
author_rank: Super Contributor
timestamp: November 10, 2015, 10:19:34 am
content: I am looking for a datasheet of this automotive chip and can not find anything.May be someone here can identify it?Thanks

author: halexa
author_rank: Regular Contributor
timestamp: November 10, 2015, 11:01:09 am
content: Hi,Maybe not much help but i think it's from IK semicon:http://www.iksemi.com/01_product.php?Cate1Code=001&Cate2Code=003They only have a handful of Automotive IC so it should be easy to narrow down, if it is an actual automtive rated part.

author: HighVoltage
author_rank: Super Contributor
timestamp: November 10, 2015, 12:32:38 pm
content: Thanks, that was already helpful.I have sent a request to IK Semiconductor, will see, what they have to say.
What be actual adc sample rate.... - Page 1
Forum section: electronics / beginners

author: A2
author_rank: Contributor
timestamp: July 28, 2014, 07:50:24 am
content: Let say I have loop before which I have configure adc as 4.8ksps i.e 208us per sample.1. Infinite Loop starts2. take 1 adc sample i.e 208us will be spent here3. Do other activity for 292us . /* Total is 500us (for combined 2 & 3) */4. Go to step 2Now if I consider the total time of loop is 500us. i.e 2000 times per sec loop will execute.1. Now for overall system specs should I mention that adc sample rate is 2000 samples/sec instead of 4.8ksps because effectively I am taking only 2ksps for adc

author: hamster_nz
author_rank: Super Contributor
timestamp: July 28, 2014, 08:12:42 am
content: Yes. Your sample rate is 2kHz. Using any other figure gives a misleading impression of system performance.
What best use can be made of salvaged boards from an AC unit (heat pump) - Page 1
Forum section: electronics / beginners

author: max.wwwang
author_rank: Frequent Contributor
timestamp: December 22, 2024, 05:51:25 am
content: See photos for the boards and a high level schematic on its case.Since there is separate filtering and main switch board (the smaller one), it can be easily be reused. The relays accept 12V DC, not as good as those with standby transformer and accept 5V logic signal (which I salvaged two from AV gear; both used in projects), but it's ok.The big power chip I believe is a 3 phase inverter module, which is cool but probably difficult to make use of it. (Still have the heatsink that comes with it.)On the big one, at the very least the full rectifier slice can be reused. Not sure if the part with the uC etc can be reused. In case there is someone who immediately recognises these boards and know them very well?[Not sure if this (forum) board is the best place for such thing. Moderator feel free to move to wherever you think suits better.]

author: jh15
author_rank: Frequent Contributor
timestamp: December 22, 2024, 05:56:00 am
content: What went wrong with the heat pump? electronics or compressor, coolant loss, etc?was the schematic packed in the heat pump? (like the good old days of appliances)

author: max.wwwang
author_rank: Frequent Contributor
timestamp: December 22, 2024, 06:04:21 am
content: Quote from: jh15 on December 22, 2024, 05:56:00 amNo idea whatsoever.No more detailed schematics.

author: max.wwwang
author_rank: Frequent Contributor
timestamp: December 28, 2024, 07:25:51 pm
content: Tested with the big one by connecting to mains, and with a DMM hooked (voltage) across the big ass caps. Apparently at least the rectifier filtering stage is working however it immediately tripped the mains switchboard. I suspect it was due to the installation current surge. Then I added an incandescent bulb in series and this time it was fine. The little led on the board lit up.If I hook the small board up, which has the massive what I understand are common mode chokes, and again based on my understanding of these chokes, they will have no effect in smoothing the momentary current inrush when turned on. This makes me wonder why other SMPSs don’t trip the switchboard given they all have essential the same rectifier and massive caps filtering stage upfront?Is it just because the capacity of the capacitors of this one (620uF x 3, which is not terribly enormous)? Not likely shorted because if so, I would have been the diodes that suffered.

author: max.wwwang
author_rank: Frequent Contributor
timestamp: January 17, 2025, 06:25:49 am
content: Interestingly, I bumped intothis webpagewhich is about exactly the same boards. So now I know the model is MUZ-FA35VA and have a tidy (high level) schematic, as well as itsmanual.
What BGA Workstation for CPU Socket Work - Page 1
Forum section: electronics / beginners

author: merismus
author_rank: Newbie
timestamp: March 17, 2014, 10:20:54 am
content: Hi All,I am looking for a Workstation that can handle Gaming Motherboards for CPU socket removal and re attachement.I have been suggested the IR9000 by the chines manufacturer but many ppl say that this Machine is not suitable!!Any suggestion? My Budget is USD$1250Thanks!!
What brand is it ? - Page 1
Forum section: electronics / beginners

author: huu_tri0101
author_rank: Contributor
timestamp: March 13, 2013, 04:34:38 pm
content: What brand is it ?

author: Towger
author_rank: Super Contributor
timestamp: March 13, 2013, 04:41:59 pm
content: It is Hitachi:

author: huu_tri0101
author_rank: Contributor
timestamp: March 13, 2013, 04:44:19 pm
content: Thank you a lot.

author: c4757p
author_rank: Super Contributor
timestamp: March 13, 2013, 04:51:17 pm
content: Hmm....

author: ddavidebor
author_rank: Super Contributor
timestamp: March 13, 2013, 07:03:21 pm
content: Don't watch me in such way!Lol

author: pspgeek
author_rank: Contributor
timestamp: March 14, 2013, 03:10:45 am
content: Strange logos companies make
What buck converter? - Page 1
Forum section: electronics / beginners

author: Darlington
author_rank: Contributor
timestamp: January 20, 2025, 12:19:52 pm
content: I would like to use a buck converter such as the AP63205 to power an ESP32-S3 with the WIFI part on and a MAX98357 class D amplifier with a 4Ohm load .In your opinion, can the required current be easily handled by the converter?

author: rteodor
author_rank: Frequent Contributor
timestamp: January 20, 2025, 12:37:04 pm
content: Just yesterday I tried it (AP63200) briefly. 24V to 5V, held at 0.5A easily, 88% efficiency.I'll add some more load later and see how it goes. DS says 2A but I would not go that high as I did not take care of the thermal.Seems like a good part, its just that soldering it is an ant masturbation challenge.

author: Darlington
author_rank: Contributor
timestamp: January 20, 2025, 12:44:03 pm
content: I don't know if it is suitable to handle the loads I mentioned above, what do you think?I would supply it with 12V input and an output voltage of 5V feeding the MAX98357.An LDO would take the 5V and bring it to 3.3v to power ESP32.Yes you are right that package is a challenge

author: rteodor
author_rank: Frequent Contributor
timestamp: January 20, 2025, 01:05:33 pm
content: Quote from: Darlington on January 20, 2025, 12:44:03 pmI read 3.2W for MAX98357 that would be 0.64A. Then there should be 100...200mA for WiFi on top of what ESP32 needs. It might need some cooper to keep it cool. Other than that I don't see why it would not work.

author: Darlington
author_rank: Contributor
timestamp: January 20, 2025, 01:20:13 pm
content: Ok , but then what does this parameter refer to? I have attached it as a image.

author: Siwastaja
author_rank: Super Contributor
timestamp: January 20, 2025, 01:33:38 pm
content: Quote from: Darlington on January 20, 2025, 01:20:13 pmThis means that the IC does not get damaged from 1.6A current applied to said pins, if every other condition is maintained. It does not tell anything about if the IC is operational in this state; it might enter protection mode, for example. Absolute maximum ratings rarely are good for operational design.

author: rteodor
author_rank: Frequent Contributor
timestamp: January 20, 2025, 02:07:27 pm
content: Quote from: Darlington on January 20, 2025, 01:20:13 pmThat is probably for an overload. Take it as worst case. In normal use it is specified to deliver 3.2W on 4ohm load (+ efficiency loss specified as 8% on 8ohm).AP6320x has current limiting (but I'we seen other converter failing even if it claimed the same).All in all, by the spec it is good to go.Just made a few more tests (crude alligator clips, awful long wires, fan cooled 10ohm/10W load resistors and 121gw thermocouple): with one resistor 465mA cca. 4degC increase on the chip. With a second resistor 842mA about 9degC increase.

author: Darlington
author_rank: Contributor
timestamp: January 21, 2025, 10:27:05 am
content: Just so you know, I also found an IC that is perhaps even more versatile than Texas. The LMR51430. I take advantage of this topic to ask one more thing.Does anyone know the value of FB1 and FB2 inductors in this schematic?
What bus for temp and relative humidity sensors in a building. - Page 1
Forum section: electronics / beginners

author: Swake
author_rank: Frequent Contributor
timestamp: October 15, 2014, 01:57:59 pm
content: I would like to install lots of temperature and relative humidity sensors in a building. With central monitoring and logging. About 40 sensors in total. This number will probably grow over time. Later on I would also integrate some other sensors as well (pressure; light; CO2; presence;...)2 or more sensors might be installed in the same location.What is the best system/bus for this application?I was thinking about one-wire, cheap and easy for temp logging (DS18B20), but I could not find something for relative humidity, probably didn't search far enough yet.Central unit will be a raspberry Pi or similar. With main function logging and communication/reporting.Thanks in advance for the help.

author: Simon
author_rank: Unknown
timestamp: October 15, 2014, 02:48:29 pm
content: What busses do you have an an option on the raspberry pi and what busses can the sensors work on ? Alternatively if it's a lot of cabling and you can't get sensors to matcj the raspberry pi anyway you will probably be best to have a uC hub connected the the rasbery pi via something like USB to talk to all of the sensors via a small uC interface board.
what can be substituted with PHOTO-FLASH capacitor? - Page 1
Forum section: electronics / beginners

author: ghanbari
author_rank: Newbie
timestamp: December 18, 2014, 08:18:47 am
content: Hi everyone,I am going to build a simpleEDM(Electric discharge machining) system and its circuit schematic is as following:Capacitor C3, is needed for making coarse EDM cuts. This electrolytic capacitor should be aphoto or strobe flashcapacitor. The rating should be a minimum of 100VDC @ 80uf (Schematic and information from: "The EDM How-To Book" by Ben Fleming).Now, the main problem is that, the mentioned capacitor is not available in my country, so i want to substitute it with an array of parallel normal capacitors that are available for me. I need to know what kinds of capacitors are suitable to be used?

author: Seekonk
author_rank: Super Contributor
timestamp: December 18, 2014, 02:13:19 pm
content: I've worked a lot with EDM, even used a similar method to machine at nearly 1mhz (100% electrode wear) on a very specialized product. Really wish you would use a switched FET to do this. About the cap, you don't want one there should be many in parallel. Most consumer caps are only good for a half amp. Multiple caps in parallel will give you lower inductance and ESR. Lower heating will greatly extend the life of the capacitors. 20uF each should work nice. I wouldn't think a photoflash capacitor would be that exceptional. After all they only need to flash every couple of seconds, this would be continuous. Hope you are not expecting much performance with this. An actual FET driven machine of 20A is only a tiny more effort and I wouldn't have a machine that couldn't at least provide a 150V teaser.

author: SeanB
author_rank: Super Contributor
timestamp: December 18, 2014, 05:18:41 pm
content: You would be better off using a lot of film capacitors in parallel to make up the value. 16 10uF 400VAC motor run capacitors will give a correct value, and will have the pulse rating you need. You just need to ensure that the wires used to connect them together are all the same length, and they should ideally be 2.5mm copper wire with a large terminal to join them together. If you use values larger than about 22uF film caps they will fail with time as they are not really rated for crash discharge, but the 10uF ones will most likely not see a high enough current per unit.

author: ghanbari
author_rank: Newbie
timestamp: December 19, 2014, 08:18:35 pm
content: Thank you wilfred, Seekonk and SeanB,your answers were very helpful for me.
What Can I Do With A 575v 3 Phase Motor? - Page 1
Forum section: electronics / beginners

author: electromateria
author_rank: Regular Contributor
timestamp: May 15, 2022, 10:47:49 pm
content: I just got an industrial air compressor pump and the motor that goes with it.Here are the motor specs:HP: 1RPM: 1745Volts: 575Amps: 1.1EEF 82.8 ~ ()Model: HKH2Similar to this one here:https://www.nriparts.com/products/alstom-hkh2-electric-motors-obsolete/150307-Should I keep the motor as is and wait til I have a rotary converter? (realistically years away)-Should I try to rewire it for 240v / single phase?-Is there any way to convert the motor to run off DCV?-Does this motor have permanent magnets or is it electromagnet driven, and how do I tell?

author: Benta
author_rank: Super Contributor
timestamp: May 15, 2022, 11:01:44 pm
content: 1: up to you.2: won't work.3: no. Unless you want to make a big electronic project.4: it's an induction motor, no permanent magnets.Keep it as a conversation piece or a boat anchor for a kayak.

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: May 17, 2022, 11:38:51 am
content: 1 HP induction motors are cheap. If you don't already have the stuff laying around, it will cost more to make it useful at a different voltage than just buying a motor to suit the purpose.I have a number of 3P 480vac motors running equipment in my shop but they are all on VFDs sourced with a single phase 120vac-480vac 4KVA transformer.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 17, 2022, 12:19:15 pm
content: You can try to eat it.I once read a story about a Japanese guy who ate a whole car, so such a small motor can't be much of a problem.
What can this single ODrive ESC do?  - Page 1
Forum section: electronics / beginners

author: Peter0304
author_rank: Newbie
timestamp: June 22, 2021, 02:50:27 am
content: Have anyone use similar ESC before? What can this electric modulation be applied? Seems it is different from VESC.https://sequremall.com/collections/odesc/products/odesc-single-drive
What cause the power difference among different wireless mode / rate? - Page 1
Forum section: electronics / beginners

author: sam1275
author_rank: Frequent Contributor
timestamp: May 26, 2015, 09:28:58 am
content: Hi everyone.I noticed that in some high power wireless network devices, the higher speed it working, the less tx power / rx sensitivity it will be, a sample from a data sheet:Transmitter Power:802.11b: 28 ± 1.5 dBm802.11g: 23 ± 1.5 dBm802.11n: 23 ± 1.5 dBmReceive Sensitivity:-73 dBm @ 802.11n-76 dBm @ 54Mbps-91 dBm @ 11Mbps-95 dBm @ 1 MbpsWhy is this?Thank you.

author: ConKbot
author_rank: Super Contributor
timestamp: May 26, 2015, 05:19:04 pm
content: IIRC, 802.11b has a lower peak to average power ratio (PAPR) than a/g/n because it uses a different encoding. Since the amplifiers peak power is fixed, that means the average TX power ( the spec shown) can be higher for 802.11b.As far as the recieve side I cant give an authoritative response either, but generally, as your bandwidth of your receiver increases, so does the noise power, which decreases sensitivity. Also, with a encoding that does more bits per symbol, your SNR requirements increase. With an equivalent receiver, your "energy per bit" stays the same, so higher bit rate, higher energy put into the RX required.http://en.wikipedia.org/wiki/Eb/N0

author: sam1275
author_rank: Frequent Contributor
timestamp: May 27, 2015, 03:25:18 pm
content: Quote from: ConKbot on May 26, 2015, 05:19:04 pmWow, great explanation, I think that make sense, thank you very much.
What cause transient on transformer - two switch forward - Page 1
Forum section: electronics / beginners

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: September 02, 2024, 11:10:52 am
content: There is tendency to oscillate with some parasitic capacitence i guess? Any ideas how can i get rid of it?Thanks =)

author: PGPG
author_rank: Frequent Contributor
timestamp: September 02, 2024, 04:25:13 pm
content: At schematic I don't see power source for circuits at right side.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 02, 2024, 04:31:15 pm
content: Well, there's an inductor shown. And capacitors (MOSFET Coss, diode Cj). Is that enough to go on, or--?Tim

author: Benta
author_rank: Super Contributor
timestamp: September 02, 2024, 08:56:13 pm
content: That's perfectly normal and happens when the inductor no longer carries DC current. As soon as you add a load, it should stop.
What causes lead acid batteries to go short? - Page 1
Forum section: electronics / beginners

author: brainwash
author_rank: Frequent Contributor
timestamp: July 01, 2013, 08:02:19 pm
content: I bought a broken car starter helper from ebay and it has a 22Ah VRLA battery inside that is shorted. I've never met any batteries until now that have all elements shorted. I assume since the battery was dry all the shocks (transportation) caused the lead plates to break and fall on the bottom of the element shorting it. However, it's not clear to me and I cannot find any explanation anywhere.I've revived dead batteries and recycled ones with one or at most two elements shorted, but never met any one with all of them shorted.I've let my trusty Accucel-6 charger charge it in NiMH/NiCd mode at 3-5A for about 8h and it still reads zero while drawing maximum amps, so the battery is beyond saving.

author: brainwash
author_rank: Frequent Contributor
timestamp: July 01, 2013, 08:17:58 pm
content: Sorry, you can ignore the post, the battery was 'fine', the actual circuit inside the starter is shorted, which is good news. It was stupid of me to not try to disconnect the battery and assume the circuit was ok just by testing with some leads removed.

author: brainwash
author_rank: Frequent Contributor
timestamp: July 03, 2013, 05:08:40 pm
content: Battery started holding charge after ~40h on a supply at 14.4V/1A. Yesterday it was only holding 5V, today is holding over 10V.For anyone else trying this (I did it many times): make sure you do it outside, vent caps off or loose, limit the current to at most 1/10 of capacity, make sure there is enough liquid. They will never hold the initial charge nor provide the crank amps, but they will perform at 30-70%.Regarding the topic of reviving batteries, is there any study on CC/CV supply vs pulsers? I have never used a pulser but I don't trust voodoo magic and would guess in a controlled test they would perform exactly the same. Has anyone done a comparison?

author: KJDS
author_rank: Super Contributor
timestamp: July 04, 2013, 06:54:02 am
content: There has been far more work done on NiCad and Li-iion, none of which I've looked at in the last twenty years.There are some advantages to charging those with a pulse, especially on larger batteries. however the only real issue to lead acid is boiling the electrolyte off.
what changes do i make to work this program? - Page 1
Forum section: electronics / beginners

author: rizlesz2000
author_rank: Contributor
timestamp: November 20, 2023, 02:12:52 pm
content: so here the watch update: the watch works fine i guess. So i needed a better ui and i came across this:https://github.com/RQNG/WouoUIwhich gives a smooth silky ui but this program is made for stm32 microcontrollers. I initailly tried to change pin configuration to work with my esp32c3 xiao (i first changed the oled configuration from PB6,7 to D4, D5 and button configs) and i forgot to mention that this program uses HID keyboard. So removed that too. and i tried to upload it. It uploaded fine but nothing on display. what things should i do to work it with my xiao? Im using a 128x64 oled.
What chip provides parallel data to UART circuit? - Page 1
Forum section: electronics / beginners

author: m4rtin
author_rank: Regular Contributor
timestamp: August 11, 2013, 04:26:33 pm
content: As I understand, UART is an integrated circuit which translated data between parallel and serial forms. While serial data is transmitted to wire(or air in case of BT or IrDA), then what provides parallel data to UART circuit? And in the other end, the serial data is translated back to parallel. What requires this parallel data?

author: c4757p
author_rank: Super Contributor
timestamp: August 11, 2013, 04:35:35 pm
content: Microprocessors....

author: ejeffrey
author_rank: Super Contributor
timestamp: August 11, 2013, 04:57:43 pm
content: Yes, microprocessors. Even if the UART is built in, the microprocessor internally has parallel data structures, and the UART serializes them.That isn't all that UARTs do. They also have the reclocking logic necessary to handle the asynchronous part of UART, and they have a FIFO to handle the speed rate differential between the MCU and the serial connection.

author: ignator
author_rank: Regular Contributor
timestamp: August 11, 2013, 05:23:03 pm
content: In my past, PLD or FPGA unloaded the UART, and most recent, the UART digital hardware was sucked into the PLD/FPGA. The processor would dump data into a FIFO RAM, and modify pointers, that the unloader hardware would autonomously pump out and in from the external serial stream. But in the old days it was all microprocessor with interrupt timer that was a function of the UART buffer size, so if it could keep the last two received words, the timer was set to interrupt at 2x the word time period.Hate to say it but it was the software weenies that wanted to not have to service UART interrupts.

author: free_electron
author_rank: Super Contributor
timestamp: August 11, 2013, 07:41:56 pm
content: 8251 16550 16450 are a few usarts. ay3-15xx also.
What component is it I am thinking of? - Page 1
Forum section: electronics / beginners

author: markbrannan
author_rank: Newbie
timestamp: October 28, 2014, 11:44:35 pm
content: I am thinking of a component I would need for a project i'd like to try, but I can't remember if this component exists and if it does what it's name is.I want to send some serial data (over some interface, it doesn't matter), in this case the data is a number, to an IC and for that IC to output the binary representation of the number across it's pins - i.e. if I send the number 5 the output pins would be 5V 0V 5V 0V to represent 1010 = 5. Now, my questions are, does this part exist? If so, what is the name of the part/can you recommend a good one?In the past I have hand-programmed a microcontroller to do this, but I am sure I came across a part that does just this out of the box.

author: wraper
author_rank: Unknown
timestamp: October 28, 2014, 11:49:43 pm
content: There are plenty that match the task. 74HC594 for example.

author: bigsky
author_rank: Regular Contributor
timestamp: October 29, 2014, 12:21:53 am
content: The part is a shift register, of the serial in parallel out flavour. Lots available as wraper said.If the data is RS232 or similar, you might also be thinking of a UART, but they do a lot more.
What component is this? - Page 1
Forum section: electronics / beginners

author: Alfgan
author_rank: Contributor
timestamp: October 19, 2019, 03:09:17 pm
content: Hello everyone!Recently I disassembled and old ADSL over POTS splitter and fould an component which was commented as 'GAS'I want to found out what component is this? Maybe someone knowsThanks.Have a good day

author: bd139
author_rank: Super Contributor
timestamp: October 19, 2019, 03:13:25 pm
content: It’s a spark gap. Shorts out high voltages across the incoming lines.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 19, 2019, 03:16:38 pm
content: More specifically a GDT (gas discharge tube). These are available in various ratings, and usually used for lightning protection, which is a good idea for anything attached to long wires like telephone lines.Tim

author: Alfgan
author_rank: Contributor
timestamp: October 19, 2019, 03:35:59 pm
content: Wow thank you very much! I will read about it more.Everything that is on PCB or it is electronics interests me

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: October 19, 2019, 09:27:33 pm
content: here is a catalogue of some GDT's in various packages for reference, :http://www.aolittel.com/supplier-284716-metal-oxide-varistor
What component is this? - Page 1
Forum section: electronics / beginners

author: twwwt
author_rank: Newbie
timestamp: January 10, 2021, 02:25:14 pm
content: The following is a component I can't identify. It looks like a diode, except that it has one blue ring pretty much in the middle of its enclosure (rather than towards either terminal, like it is the case for a diode).I have a few of them. All measure to about 170 to 200pF by my LCR meter (Keysight U1733C). They have no measurable resistance; it seems to be so high at least my LCR meter can't measure it. I doubt it is a capacitor - I have never seen such a component design. The only thing I can add is that it is rather old, produced during the 80ies. Could it be a varistor?

author: madires
author_rank: Super Contributor
timestamp: January 10, 2021, 02:42:23 pm
content: More likely a DIAC.

author: twwwt
author_rank: Newbie
timestamp: January 10, 2021, 05:50:01 pm
content: I've found a simple test circuit consisting of a resistor in serial and a capacitor in parallel to a DIAC that results in a ramp signal if driven by an alternating signal. I will use that to check whether (a) these are indeed DIACs and (b) what the breakdown voltage is. I will report back my findings.Thanks.

author: twwwt
author_rank: Newbie
timestamp: January 11, 2021, 04:32:33 pm
content: Things have cleared up. Experiments showed that it is indeed a DIAC. Breakover voltage is approximately 25V. What is more, I've also found an image in the Internet that matches precisely. According to this it is aKR100, produced byTesla, the no longer existing electronics company in the former Czechoslovakia. They work nicely even after more than 30 years, yeah!
What component is this?  - Page 1
Forum section: electronics / beginners

author: laban93
author_rank: Contributor
timestamp: February 20, 2022, 02:27:32 pm
content: Hey all. I am trying to repair a failed 24v psu, and found this fsiled component that i cannot identify. Looks like the outer casing has ruptured, and left a glass fiber voven core visible. Any ideas?

author: Shock
author_rank: Super Contributor
timestamp: February 20, 2022, 02:31:27 pm
content: Looks like an axial fuse, thermal fuse.

author: laban93
author_rank: Contributor
timestamp: February 20, 2022, 02:31:49 pm
content: Added a picture of the placement in the circuit if that helps

author: laban93
author_rank: Contributor
timestamp: February 20, 2022, 03:02:02 pm
content: Well, i replaced it with a fuse. Then blew the top of an IC when powered up.I guess this goes in the parts bin!

author: Labrat101
author_rank: Unknown
timestamp: February 20, 2022, 05:44:02 pm
content: It was a 5w wire wound resistor .Depending on the exact circuit it was probably 10R0 . Some China 24v units use a 2R2 . . You will have to reverse engeer a bit . The chip is probably the power correction . A little hard to see the exact from your photo .Was that transistor a rectifier double diode . ?

author: Shock
author_rank: Super Contributor
timestamp: February 20, 2022, 06:39:09 pm
content: The IC is only a buck, you jumped ahead a little or left out what you tested. There was likely a short somewhere and might still be. I'd be diode hunting.

author: Labrat101
author_rank: Unknown
timestamp: February 20, 2022, 07:00:40 pm
content: I also forgot to mention if that resistor has blown for sure you have other problems . Diodes as mentioned and even the driver Mosfets or Power transistors.If these are blown your feed back has a problem can be due to the small 4.7uf 50v go open and goes into overload and the rectifiers fail and or drive circuit.Without knowing the exact type or rating the PS can fail in many ways
What component is this? - Page 1
Forum section: electronics / beginners

author: Eg3300401
author_rank: Contributor
timestamp: January 05, 2023, 11:32:21 pm
content: I am trying to figure out what this is. It is on a 2070 super turbo

author: themadhippy
author_rank: Super Contributor
timestamp: January 06, 2023, 12:26:25 am
content: googles a wonderful thing,you should try it some day ,the first hit for 100c07 smd not only tells me its a tantalum cap,but also shows a picture to confirm things

author: bidrohini
author_rank: Regular Contributor
timestamp: January 12, 2023, 01:49:25 pm
content: Tantalum capacitor. But could not find a datasheet.https://www.kupindo.com/Elektronika/69921929_Smd-tantal-100uf

author: timenutgoblin
author_rank: Regular Contributor
timestamp: January 12, 2023, 09:01:27 pm
content: Judging by the silkscreen markings on the PCB, either a tantalum or electrolytic capacitor could be installed. They decided to install tantalum capacitors.Source:www.minikits.com.au
what component is this?  - Page 1
Forum section: electronics / beginners

author: Michaelpier
author_rank: Contributor
timestamp: July 07, 2016, 04:07:38 am
content: There is nothing written on the component and i cant seem to understand what is it.I took it out from a power supply.It looks cracked/broken and i want to replace it.Here is a picture

author: george.b
author_rank: Frequent Contributor
timestamp: July 07, 2016, 04:21:31 am
content: A PTC, maybe?

author: Brumby
author_rank: Unknown
timestamp: July 07, 2016, 04:31:09 am
content: Can you show us where in the supply it was located?

author: Michaelpier
author_rank: Contributor
timestamp: July 07, 2016, 04:52:58 am
content: for the 2 points of the component i draw two red small arrows on the first pic.I measure the resistance of the component and it shows 83 ohms.

author: dacman
author_rank: Frequent Contributor
timestamp: July 07, 2016, 10:06:39 pm
content: That resistance measurement (83 Ohm) is similar to a VA8650 PTC Thermistor made by Mullard. The blue coating on the leads is an indication that it was made by Mullard.