hybridfree/eevblog-posts huggingface dataset:
What is the diffrence between lm324 and lm318 opamps - Page 1
Forum section: electronics / projects

author: elmatador
author_rank: Newbie
timestamp: May 08, 2019, 01:26:09 pm
content: i want to design the same function generator by using lm318 only

author: flynwill
author_rank: Regular Contributor
timestamp: May 08, 2019, 01:38:21 pm
content: I suggest you go read the data sheets.The LM324 has roughly 10x the bandwidth of the LM318. The designer likely choose it for the square-wave section to get shorter rise/fall times on the square-wave signal. The circuit should work with all LM318 sections, just won't reach as high a frequency, and will have softer edges on the square-wave signal.

author: Gyro
author_rank: Super Contributor
timestamp: May 08, 2019, 04:56:20 pm
content: Quote from: flynwill on May 08, 2019, 01:38:21 pmCompletely the wrong way round, the LM318 is a 15MHz 50V/us part (or 150V/us with feedforward compensation).Wayfaster than an LM324, which only has a unity gain bandwidth of 1MHz.The LM318 is still unity gain stable though but you would need to be more careful with layout.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: May 08, 2019, 07:04:27 pm
content: The LM318 is a very old part. Still capable, but also very prone to oscillation if you don't do everything right. I'd get some LM324s for that project. They're cheaper and less troublesome.There are some interesting circuits where the input stage of the LM318 is turned off, and replaced with discretes to get higher performance. Not sure if those circuits haven't been surpassed by more modern parts.

author: David Hess
author_rank: Super Contributor
timestamp: May 08, 2019, 09:06:43 pm
content: The 318 was one of the first if not the first "video" operational amplifiers. Input degeneration gives high bandwidth and slew rate but also higher noise and less precision. There are modern "video" operational amplifiers which use the same idea but also other types of video operational amplifiers.318 Faster324 Slower318 Dual Supply Part324 Single Supply Part318 +/-15 Volt Maximum Differential Input Voltage (1)324 +/-36 Volt Maximum Differential Input VoltageThe modern AD818 is very similar and I suspect intended as an improved replacement although it does not support external compensation and has a different offset null configuration. Th AD825 is an alternative I would consider because its higher maximum differential input voltage makes it more general purpose.(1) This matters when used as a comparator.Quote from: flynwill on May 08, 2019, 01:38:21 pmYou are thinking of the LM308 but even it is not that slow. An LM308 will actually be faster than an LM324 in most applications when properly frequency compensated.
What is the function of the part HR682480E ? - Page 1
Forum section: electronics / projects

author: sangar
author_rank: Regular Contributor
timestamp: December 13, 2018, 05:39:34 am
content: Hi All,I am doing reverse engineering a board in which I found a part HR682480E that is located near to Ethernet connector...I don't see any datasheet is available there for this part...Could you let me know the purpose of this and any alternate?Thanks,Muthu

author: chrisl
author_rank: Regular Contributor
timestamp: December 13, 2018, 06:05:40 am
content: isolation transformer?http://rj45modularjack.sell.everychina.com/p-108235198-hr682480-magnetic-lan-gigabit-ethernet-isolation-transformer-with-poe-lp82440anl.html
What is the internal structure difference between a dual supply opamp and single - Page 1
Forum section: electronics / projects

author: opa627bm
author_rank: Regular Contributor
timestamp: March 09, 2014, 07:10:11 am
content: Hello everyone, I was playing around with a ldo circuithttp://www.maximintegrated.com/app-notes/index.mvp/id/3657and I noticed that some of the opamps doesnt work in the circuit. Later I found out is because some of them only works in dual supply mode so the feed back need to be grounded in the middle of the rails. What is the internal structure difference between a dual supply opamp and a single supply one? and Why the opamp is acting as an inverting amplifier to drive the MOSFET? thank you!

author: SebG
author_rank: Regular Contributor
timestamp: March 09, 2014, 08:22:02 am
content: There really isn't any difference since as far as the op-amp is aware the voltage that powers it is Vcc - Vee. The reason some op-amps might not work is that they can not output a voltage close or at the power rails so if the lower voltage (Vee) is at GND the lowest output can be something like .7 or 1V or 2V depending on the device. Rail-to-Rail op Amps can output voltages closer to the power rail. Setting one up as a dual supply allows the op-amp to output 0V very easily.

author: SebG
author_rank: Regular Contributor
timestamp: March 09, 2014, 08:35:15 am
content: Also the mosfet is P-ch so it needs an op-amp with an inverted output. The mosfet turns on as the Vg is less then Vcc - .7 (or whatever the threshold voltage is) so the mosfet needs an decreasing voltage at the gate for an increasing V+ input (proportional to the circuit output voltage, OUT)

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 09, 2014, 02:57:58 pm
content: Typically, a "dual supply" type op-amp stops working if one or the other input gets closer than 1-3V to the positive or negative rail. The voltage range, and how it "stops working", both depend on design. What usually happens is, the input stage goes into cutoff, or input bias is shunted out of the input terminals, and the output saturates to +V or -V. (It's always the same direction, so if the output slammed to +V by pulling +in to -V -- phase reversal -- the amp can get stuck that way!)It's fairly easy to make an op-amp that works up to one supply, e.g., some JFET amps work up to +V, some bipolar amps (LM358, etc.) work down to -V. The most common method of making an amp that handles both is to simply invert and repeat half the circuit. So the normal input circuit might have PNP transistors (that work down to -V), the inverted section would use NPN transistors (that work up to +V). Somewhere inbetween, the two sections cross over, with the result that input offset voltage changes suddenly (because it's like using two distinct op-amps in parallel, each with its own offset voltage). TLV2371 is a MOSFET amp that does this.Output stages also vary, for similar reasons. Outputs that can reach the supply rails are more difficult to design, and usually have worse power consumption, higher distortion and so on.Tim
What is the IPC document standard for through hole dimensions... - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: September 23, 2017, 09:48:27 pm
content: The 7351 has dimensions for SMT stuff, but is there one for through hole? That would say what the lead width typically of a 1/2W or 1/4W resistor, etc.

author: Cervisia
author_rank: Regular Contributor
timestamp: September 24, 2017, 08:23:51 am
content: Google points to IPC-7251.

author: ocset
author_rank: Super Contributor
timestamp: September 24, 2017, 09:46:27 am
content: Its ultimately up to your pcb manufacturer and what tolerance they can work to.For say a little 1/4w reisstor, i make the hole diameter 0.2mm more than the largest tolerance lead diameter....bigger if ive got lots of pcb space.And ill try and make as few different thru hole sizes on a board as possible, so that its cheaper....ie use one drill size if you can get away with it

author: alank2
author_rank: Super Contributor
timestamp: September 27, 2017, 03:26:36 pm
content: I've looked through the IPC-7251 - maybe I am missing it. What I am looking for is a list of standard package sizes, like DO41 and what the dimensions of that package are. Is there a single guide that has all of these together?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 27, 2017, 08:14:37 pm
content: 2221 is still commonly referenced, not sure if it's the primary one today.It doesn't specify package sizes, which are JEDEC for the most common (multiple source) semiconductors.Probably, there is too much flexibility among THT parts -- after all, the leads can be formed to any position, if long enough. (SM-782 has a similar problem with SMT inductors, which are so diverse, only general rules can apply; IPC-7351's calculations are useful here.)Tim
What is the maximum safe ripple and noise output of usb power supply for phones? - Page 1
Forum section: electronics / projects

author: mehdifat
author_rank: Regular Contributor
timestamp: November 23, 2024, 06:18:46 pm
content: hello.can you kindly tell me What is the maximum safe ripple and noise output of usb power supplies that are used to charge smartphones before possible damage to the battery or electronic components ?i searched a lot on the web but couldn't get an even general answer.different recommended methods of ripple measurement like adding caps at the PSU output or not, made me even more confused.

author: mehdifat
author_rank: Regular Contributor
timestamp: November 25, 2024, 07:50:04 pm
content: No one can help?

author: tunk
author_rank: Super Contributor
timestamp: November 25, 2024, 08:06:15 pm
content: There's tests of quite a few USB chargers here:https://lygte-info.dk/info/indexUSB%20UK.htmlIIRC the better ones are less than 100mVpp.
What is the maximum single NAND flash chip memory I can use with CY7C68023-56LTX - Page 1
Forum section: electronics / projects

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 07:41:57 am
content: Hi,Please let me know the maximum single NAND flash memory chip size I can use with this controller IC: CY7C68023-56LTXC ? Will there be a memory size limit for a chip select??Thanks in advance.Madhuwesly.

author: wraper
author_rank: Unknown
timestamp: August 07, 2018, 07:44:08 am
content: That hard to open a datasheet?

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 07:45:09 am
content: Thanks for the quick response.Please Find the datasheet here:https://www.mouser.in/datasheet/2/100/38-08055_CY7C68023_CY7C68024_EZ-USB_NX2LP_USB_2.0_-258805.pdf

author: Fsck
author_rank: Super Contributor
timestamp: August 07, 2018, 07:52:33 am
content: on the first page is:Both common NAND page sizes supported❐ 512 bytes — Up to 1 Gbit capacity❐ 2K bytes — Up to 8 Gbit capacity

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 07:58:42 am
content: Thanks,Does it means will chip select have memory size limit?If I want go with Memory size more than 8Gbit should I take 2 chips??Thanks in advance??

author: Fsck
author_rank: Super Contributor
timestamp: August 07, 2018, 08:02:14 am
content: correct. also please take note of the page size restriction.

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 10:27:34 am
content: Hello',Can some one suggest me manufacturers of USB Flash drive controllers which supports 16GB with Single NAND flash memory unit??Thanks in advance.

author: daveshah
author_rank: Unknown
timestamp: August 07, 2018, 10:54:47 am
content: The CY7C68033 supports up to 16Gbit per chip select (with 4K pages) with up to 8 chip selects, but I that would still most likely mean two or four NAND chips.

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 11:46:46 am
content: Hi @daveshah,In the second page of datasheet it is mentioned that: **4K bytes for up to 16 Gb capacity**.The IC you suggested can support only 16Gbit but I want to use 16Gbyte memory chip.Thanks,

author: daveshah
author_rank: Unknown
timestamp: August 07, 2018, 12:20:43 pm
content: It can support up to 16Gbyte, but that needs to be split across 8 chip selects. If you need it to be a single chip, then that will probably be two or maybe four chip selects, so you'd need two or four chips for 16Gbyte.

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: August 07, 2018, 01:00:22 pm
content: Please clarify my doubts in reference to the following queries:In datasheet it is mentioned that:4K bytes for up to 16 Gb capacityThat means, in orderto get 16GB storageI need to take (2 X 8 = 16)8 memory chips.There 8 is number chip selects2 is max. capacity per chip select(mentioned in data sheet).But you are saying 2 memory chips can be used to achieve 16GB storage, How can it be possible???Could you Please explain it clearly.Thanks in advance.
What is the model of Flip-disc display? - Page 1
Forum section: electronics / projects

author: daisizhou
author_rank: Super Contributor
timestamp: February 19, 2025, 07:54:24 am
content: Flip-disc display physical display, one side is red and the other side is green.Working voltage DC1.5V。The manufacturer is TEDoes anyone know this exact model?

author: eutectique
author_rank: Frequent Contributor
timestamp: February 19, 2025, 03:35:34 pm
content: This one:https://flipdots.com/en/products-services/status-indicators/?Not TE, not 1.5V, though.

author: daisizhou
author_rank: Super Contributor
timestamp: February 20, 2025, 05:13:46 am
content: Nice .thanks.Unfortunately there is no exact name or model number.I can't even buy it on the shopping site
What is the most efficient way of cleaning DIP pins? - Page 1
Forum section: electronics / projects

author: technix
author_rank: Super Contributor
timestamp: August 27, 2018, 11:30:49 am
content: When I went out to buy some capacitors, the seller gave me a grab bag of 59 Toshiba 6N136 for free. Catch: those are all removed from PCBs without ever being powered on (long story) and the pins often have globs of solder on them preventing insertion into a breadboard for testing.How can I remove the excessive solder efficiently? I have solder iron, wick and hot air gun.

author: David Hess
author_rank: Super Contributor
timestamp: August 27, 2018, 12:54:01 pm
content: I usually use my soldering iron and solder wick followed by cleaning with acetone or isopropyl alcohol to remove flux. I use a little vice to hold the part while using the soldering iron and wick.

author: technix
author_rank: Super Contributor
timestamp: August 27, 2018, 02:05:53 pm
content: Quote from: David Hess on August 27, 2018, 12:54:01 pmCan this scale up to 59 chips?

author: Bud
author_rank: Super Contributor
timestamp: August 27, 2018, 02:50:37 pm
content: Maybe immersing the leads into solder bath can help, followed by a wipe with a kimwipe? But you do not have a solder pot.

author: KL27x
author_rank: Super Contributor
timestamp: August 28, 2018, 01:08:48 am
content: It makes things easier to have a nonporous heat resistant work surface for the flux to pool on. A blank piece of FR4 works great.If you have no liquid flux, then you'll probably have to add some solder to the pins to get them reasonably clean. Load them up with solder, one after the other over the same spot on the worksurface so the flux builds up in that spot. Then clean the tip of the iron and take off the excess solder one after the other with just the iron, slinging off and/or wiping the tip clean as needed. Keep the parts over the same spot. Then final pass, use the solderwick. (With a big chisel or bevel or such wiped clean, you may not even need solderwick.)With multipin parts it can get annoying because the part will get stuck in the flux residue. But for 4 pin optocoupler it shouldn't be a problem to get them off the board before the flux hardens.If you want to remove the flux residue it helps to use a solvent and a brush and some paper towels/kimwipes.Best advice is don't do this until you are ready to use the parts. It is a waste of time if you never end up using them, and it is highly likely any given part you have, you will never use.

author: David Hess
author_rank: Super Contributor
timestamp: August 28, 2018, 02:21:19 pm
content: Quote from: technix on August 27, 2018, 02:05:53 pmIt should not take more than 15 minutes. If you want a faster way, then brush the leads with liquid flux and dip them into a solder pot.

author: IDEngineer
author_rank: Super Contributor
timestamp: August 28, 2018, 04:09:27 pm
content: Hollow tip desoldering gun. Fastest method I can think of, and will do an excellent job.
What is the name of these solder posts? - Page 1
Forum section: electronics / projects

author: ToBeFrank
author_rank: Regular Contributor
timestamp: February 09, 2012, 06:37:53 am
content: I'm trying to find these solder posts on digikey/mouser/etc but having no luck because I don't know what to search for. Any clues?

author: Bored@Work
author_rank: Super Contributor
timestamp: February 09, 2012, 09:17:21 am
content: I know them as soldering pins or soldering terminals. Digikey uses all sorts of names for them, seehttp://parts.digikey.com/1/parts-kws/solder-cup-pcb-terminal-pinAndhttp://parts.digikey.com/1/parts/1901338-term-pcb-pin-nail-head-l-6-3mm-h2105b01.htmlcomes close to what you have.

author: george graves
author_rank: Super Contributor
timestamp: February 09, 2012, 09:23:29 am
content: Wow. So...question if you dont' mind. What are they used for? Test points? Or contacts?

author: Short Circuit
author_rank: Frequent Contributor
timestamp: February 09, 2012, 11:48:30 am
content: They are called soldering turrets, and they are for soldering wires to the PCB. Not really worthwhile imho, but some people like them.Harwin makes a bunch of those, although not exactly the same model;http://www.harwin.com/terminals-hardware-pcb-turned-5B-category.html

author: ToBeFrank
author_rank: Regular Contributor
timestamp: February 09, 2012, 02:40:46 pm
content: Thanks. I basically want to duplicate this board, but add a TVS device to it. The turrets are intended to be used like this:
(solved) what is the name of this plug? - Page 1
Forum section: electronics / projects

author: whitevamp
author_rank: Regular Contributor
timestamp: July 18, 2016, 04:32:24 am
content: ok so i have this powered breadboard and it has a couple broken sockets and i cant seam to find anything that looks like this or what the heck the name is.so thought id post here and see any one wiser then me could tell me what the name of it is so maby to make it easier to to find.it's like a 1X4 bread board. it has 2 solder pins and one jumper/ don't know what else to call it., that runs from one end to the other end connecting all for sockets together as one.

author: Mr J
author_rank: Regular Contributor
timestamp: July 18, 2016, 04:42:13 am
content: Single Contact Point Blockhttp://www.elexp.com/ProductDetails.aspx?item_no=03TB-IVR&CatId=36e69afb-3c1f-4322-9ac3-6e126246b7aehttp://www.elexp.com/ProductDetails.aspx?item_no=03TB-SNG&CatId=36e69afb-3c1f-4322-9ac3-6e126246b7aeMr. J N1IR

author: whitevamp
author_rank: Regular Contributor
timestamp: July 18, 2016, 04:56:34 am
content: Quote from: Mr J on July 18, 2016, 04:42:13 amwow so fast, and here i have spent off and on the better part of a month looking.thank you.

author: Mr J
author_rank: Regular Contributor
timestamp: July 18, 2016, 05:07:07 am
content: no prob, my students break them off trainers all the time, I've replaced many. I think Digikey has them as well.

author: whitevamp
author_rank: Regular Contributor
timestamp: July 18, 2016, 05:13:11 am
content: Quote from: Mr J on July 18, 2016, 05:07:07 amthat's one of the places i think i looked at. and dint see anything.
What is the name of this power connector ? - Page 1
Forum section: electronics / projects

author: jujun
author_rank: Regular Contributor
timestamp: November 22, 2019, 03:23:14 pm
content: Hello,Do you know what is the name of this connector ?On left, a standard power supply connector for reference.Is there a hackish way to connect a plug on it ?Thank you

author: Ian.M
author_rank: Super Contributor
timestamp: November 22, 2019, 03:43:29 pm
content: https://en.wikipedia.org/wiki/IEC_60320Scroll down to C19/C20

author: Cerebus
author_rank: Super Contributor
timestamp: November 22, 2019, 03:47:09 pm
content: Quote from: jujun on November 22, 2019, 03:23:14 pmThe 'standard' mains connector is an IEC 60320C14connector, and mates with an IEC 60320C13connector.The one you don't know is an IEC 60320C20connector, and mates with an IEC 60320C19connector.Nothing 'hackish' needed, just go out and buy a C19 lead/connector - they are very widely available. E.g.https://www.ebay.fr/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=IEC+60320+C19+&_sacat=0

author: MagicSmoker
author_rank: Super Contributor
timestamp: November 22, 2019, 03:53:11 pm
content: OP duplicate posted and needs to pick one thread and delete the other, despite that people have inexplicable posted replies to both of them...

author: jujun
author_rank: Regular Contributor
timestamp: November 22, 2019, 03:56:06 pm
content: Quote from: MagicSmoker on November 22, 2019, 03:53:11 pmWhen I created the topic I had a SQL error, and then it worked.Thank you all for your answers

author: DenzilPenberthy
author_rank: Frequent Contributor
timestamp: November 22, 2019, 04:37:21 pm
content: Quote from: Cerebus on November 22, 2019, 03:47:09 pmPlease tell that to the person I confiscated this homemade C15 from at my work!

author: Cerebus
author_rank: Super Contributor
timestamp: November 22, 2019, 04:43:30 pm
content: Quote from: DenzilPenberthy on November 22, 2019, 04:37:21 pmSo they turned it into a 'hot condition' connector. They wanted 'hot condition', I suggest you give it to them.
What is the peruse of this connector? - Page 1
Forum section: electronics / projects

author: Dinos Tsakalakis
author_rank: Newbie
timestamp: September 08, 2021, 06:57:39 am
content: Hallo, I start a new project on making an adapter from USB to VGA port using the I2C protocol, for this I found this schematic that I have attached down below, but I don’t understand what the purpose of this component is as it shown in the figure, I suppose is some type of connector, I also need to find the schematic symbol and the footprint of this, if it is necessary.Thanks,

author: ataradov
author_rank: Super Contributor
timestamp: September 08, 2021, 07:16:33 am
content: What are you actually trying to do? Is VGA the video interface? Do you plan to transfer video over I2C? Or just do something with the ID interface of the VGA connector?Those connectors select I/O voltage level and where some of the signals are routed. If you are making a custom board, then you don't need those connectors, you just pick whatever configuration fits your project requirements. This board is generic, so it has switches for configuring different options.

author: Terry Bites
author_rank: Super Contributor
timestamp: September 08, 2021, 07:29:31 am
content: i/o level link sets the system operating voltage to either 3.3V or 5V so that you can correctly interface to an external system that uses 3.3V or 5V.The other links allow you to drive the on board LEDs or eternal i/o. If the LEDs are connected you cant use those particular GPIOs. The LEDS will mess up the logic levels.You are looking for something like this

author: Dinos Tsakalakis
author_rank: Newbie
timestamp: September 08, 2021, 09:24:59 am
content: I am trying to make an video /audio interface using the I2C protocol, in order to communicate older devices, so it is an adaptor with usb and hdmi as an output ports and usb as input. I have in my mind to connect multiple desktop monitors, an older that has a vga connection and a newer that has hdmi connection.I am not quite sure if, after the rs232 chip need to connect any other ic for proper functionality, like TS3DV642.

author: ataradov
author_rank: Super Contributor
timestamp: September 08, 2021, 03:43:52 pm
content: There is no way to transfer audio/video over I2C. I'm not sure you will be able to do any of those things with simple cheap ICs.

author: Bassman59
author_rank: Super Contributor
timestamp: September 08, 2021, 03:48:14 pm
content: Quote from: Dinos Tsakalakis on September 08, 2021, 09:24:59 amIn "audio/video" systems, I2C isnotused to transfer the audio or video data. I2C is way too slow. It is commonly used to configure certain operating parameters of the audio or video devices.
What is the point of a 3 legged tantalum capacitor? - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: July 07, 2018, 07:54:07 pm
content: Like this:http://www.vishay.com/docs/40044/299d.pdfWhy 3 legs if they are just shorted together internally?To ensure proper polarization?

author: Gyro
author_rank: Super Contributor
timestamp: July 07, 2018, 07:56:46 pm
content: It prevents the danger of reversed insertion, yes.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: July 07, 2018, 08:03:26 pm
content: Quote from: alank2 on July 07, 2018, 07:54:07 pmIt says for reverse installation on the data sheet.Sent from my SM-G930V using Tapatalk

author: alank2
author_rank: Super Contributor
timestamp: July 07, 2018, 09:04:31 pm
content: Thanks guys!

author: texaspyro
author_rank: Super Contributor
timestamp: July 08, 2018, 04:04:57 am
content: My company used to supply boards to IBM and they required all tants to be 3-leg.

author: JS
author_rank: Frequent Contributor
timestamp: July 08, 2018, 04:50:50 am
content: Would the symmetrical design also reduce the series inductance, given a proper layout implementation?JS

author: German_EE
author_rank: Super Contributor
timestamp: July 08, 2018, 08:29:04 am
content: 1) Lower impedance connections to ground2) Impossible (I hope) to insert the wrong way in a PCB3) Mechanically more stable, no need to use any of the white goo

author: David_AVD
author_rank: Super Contributor
timestamp: July 08, 2018, 10:38:39 am
content: In a similar vein, I noticed some 9 pin SIL dual op-amps just last week. They are the same as the 8 pin SIL version, but with an extra V+ pin at the pin 1 end. This makes them symmetrical.

author: b_force
author_rank: Super Contributor
timestamp: July 08, 2018, 01:34:51 pm
content: There are similar constructions for certain ceramic capacitors as well.Mostly to get the best ESR for high frequencies.They aren't cheap though

author: precaud
author_rank: Frequent Contributor
timestamp: July 08, 2018, 04:53:06 pm
content: Quote from: alank2 on July 07, 2018, 07:54:07 pmThey're designed to stop you from being able to insert them into your LCR meter's radial component fixture.

author: alank2
author_rank: Super Contributor
timestamp: July 08, 2018, 07:38:10 pm
content: Quote from: precaud on July 08, 2018, 04:53:06 pmProbably so you have to buy the special 3 legged capacitor LCR version!

author: station240
author_rank: Unknown
timestamp: July 08, 2018, 08:40:19 pm
content: Quote from: precaud on July 08, 2018, 04:53:06 pmMy ESR meter has a set of leads with alligator clips on one end, and PCB pins on the other. How else do you measure huge inductors.

author: CopperCone
author_rank: Super Contributor
timestamp: July 08, 2018, 10:19:03 pm
content: you can save on drug testing your manufacturing personnel

author: SpencerTC
author_rank: Contributor
timestamp: July 10, 2018, 12:45:51 pm
content: Quote from: alank2 on July 08, 2018, 07:38:10 pmAt my company we are currently dealing with the "you have to buy our special test fixture" syndrome. So this gave me a nice laugh.Thanks.
What is the proper name of this electrical conduit - Page 1
Forum section: electronics / projects

author: drakejest
author_rank: Regular Contributor
timestamp: December 08, 2020, 10:08:23 pm
content: What is the proper name of this electrical conduitimageThe box in the bottom where i think the dozen of wires will be properly sorted which will then be fed to the breakers.I have tried electrical conduit on google and it does not seem to return relevant results.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 08, 2020, 10:12:13 pm
content: I am not sure what you want us to look at or what you are looking for .... but maybe this?https://leipole.en.made-in-china.com/product/yBGJrTPMYHRj/China-High-Durable-Halogen-Free-Metric-Wide-Slot-Wiring-Duct.html

author: LaserSteve
author_rank: Super Contributor
timestamp: December 08, 2020, 10:17:35 pm
content: A quick search of my favorite electrical supplier (USA) came up with:"Enclosed Trough Raceway" and "Indoor Enclosure."https://www.mcmaster.com/electrical-cabinets/oil-tight-enclosed-trough-raceway/A few more searches came up with "wireway" and "electrical raceway", adding the word "metal" to that refined the search.Hope that helps...Steve

author: themadhippy
author_rank: Super Contributor
timestamp: December 08, 2020, 10:47:38 pm
content: looks more like a busbar chamber than trunking

author: mag_therm
author_rank: Frequent Contributor
timestamp: December 09, 2020, 07:10:52 pm
content: The box in the bottom would be a "Cable Marshalling Box" in my parlance.I originated in Australia so that may be the British name too.

author: Gregg
author_rank: Super Contributor
timestamp: December 09, 2020, 08:54:24 pm
content: The box along the bottom could be called a gutter in the US. It also could be called a junction box.
What is the purpose of WP pin in a SPI NOR flash. - Page 1
Forum section: electronics / projects

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: October 17, 2017, 05:38:11 pm
content: Hi,I am going to use a SPI NOR flash as a Data logger in my design for storing GPS coordinates. I could not get clarity on the Write Protect(WP) pin on a NOR flash memory. Could any-one let me know what exactly it is and its hardware connections if we want to interface it to a Micro-controller?Thanks & regards,Madhuwesly.

author: ataradov
author_rank: Super Contributor
timestamp: October 17, 2017, 06:14:25 pm
content: If you don't need write protection, then just pull-up or pull-down it as described in the datasheet for the device.

author: rstofer
author_rank: Super Contributor
timestamp: October 17, 2017, 06:15:08 pm
content: It's probably covered in the datasheet. It is for the Cypress part but it doesn't do what I though it would do.http://www.mouser.com/ProductDetail/Carling-Technologies/2GG51-73/You MAY find that it is pulled high internally and can be ignored. Or not...

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: October 18, 2017, 05:17:13 am
content: Thanksfor the reply @ataradov. Could you please let me know what it actually do? Basically, when I have gone through few reference schematics the WP pin is pulled high in the applications.My requirements are : READ and WRITE, if possible ERASE/RESET.

author: ataradov
author_rank: Super Contributor
timestamp: October 18, 2017, 05:18:30 am
content: If this pin is low, then flash will disregard any destructive operations (erase/write). Just pull it high and forget about it.You still have not told us what chip you are using, so here is a quote from some random Micron datasheet:QuoteReads pretty clear to me.

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: October 18, 2017, 05:25:00 am
content: Thanks for the prompt reply @ataradov.Will the operations - "Erase and Write" considered as disruptive operations when it is active(Active LOW)? In this state can we read from the device?Could you please tell me what are the operations can be performed when it is active and inactive?Thanks & regards,Madhuwesly.

author: ataradov
author_rank: Super Contributor
timestamp: October 18, 2017, 05:26:02 am
content: Can you actually tell what device you are using? This is kind of important.

author: madhu.wesly01
author_rank: Regular Contributor
timestamp: October 18, 2017, 05:32:12 am
content: I am using Winbond's SPI NOR Flash - W25Q256FV. And Controller - ATSAMD21G18.

author: ataradov
author_rank: Super Contributor
timestamp: October 18, 2017, 05:36:17 am
content: Well, it says it right in the datasheet "The Write Protect (/WP) pin can be used to prevent the Status Register from being written." That's all it does. The consequences of that you can figure out by reading the description of the Status Register.Just pull it high, and forget about it, you will be able to do whatever with the flash.
What is the rated current of these inductor? - Page 1
Forum section: electronics / projects

author: Eldi4
author_rank: Contributor
timestamp: June 15, 2019, 12:22:34 pm
content: Hello there, i was trying to figure out what is the rated current of these inductors, i don't find any accurate datasheet of these inductors, these inductors is found in printer's board, the value is 101,151,221 and 331.picture attached, the other component is for size comparisonthe inductors diameter is 8mm

author: retrolefty
author_rank: Super Contributor
timestamp: June 15, 2019, 12:26:28 pm
content: Short of a manufacture's datasheet I would cap the current rating to the size of wire used in it's winding.

author: Eldi4
author_rank: Contributor
timestamp: June 15, 2019, 12:30:39 pm
content: I don't really think that is a good way to determine the rated current, because i found some inductor that look like these, and uses 2A rated wire but it was a 400mA 331 inductor, the precise method would be using an oscilloscope to see where the current started saturated, but here i dont have an oscilloscope

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 16, 2019, 12:37:01 am
content: Probably in the range of 300mA to 2A.If you want to take the time to measure, figure 40°C max temp rise; adjust current flow, then wait ten minutes and see if the temperature has stabilized to that level. I would guess the corresponding heat dissipation is under a half a watt; in that case, you can also estimate from Imax = sqrt(0.5W / DCR), assuming you have an accurate way to measure low resistances.Tim

author: lordvader88
author_rank: Frequent Contributor
timestamp: June 17, 2019, 02:57:11 pm
content: They look to me like thy would be for smoothing the output of a SMPS, and typical rails in a printer, depending on the era, are 5, 12, 24V, with maybe 24V 1-2A for motor drives, maybe 0.5A-1A for the controls stuff. I'd also say most of them should be ok at a few 100mA. Just watch their temperature.
What is the reason of getting hot an IC - Page 1
Forum section: electronics / projects

author: amirkargar110
author_rank: Contributor
timestamp: July 04, 2017, 05:37:23 pm
content: HelloI soldered a training board. but my central IC (lpc4337) becomes so hot. i am afraid if my IC burnt out.I put my finger on it to become cool each for example 4 minutes.what should i do that my IC not become so hot. (it works correctly)whats the generally reasons of a microcontroller beccome hot?thank you.

author: Zero999
author_rank: Super Contributor
timestamp: July 04, 2017, 05:56:10 pm
content: Please provide more information: pictures, schematic, code etc.

author: testian
author_rank: Regular Contributor
timestamp: July 04, 2017, 07:10:29 pm
content: Maybe a short a an output. Does the µC still get hot if every pin is configured as an input?

author: schmitt trigger
author_rank: Super Contributor
timestamp: July 04, 2017, 07:11:43 pm
content: As HERO has requested, please post pictures and schematics;I can think of a pair of things;1) your circuit is overloading the processor. An output port diving an LED without a resistor is a common error.2) surface mount ICs sometimes have a pad on its bottom, whichmust besoldered to a ground plane with low thermal resistance.But without the requested information, I'm only speculating and could be wrong.

author: Fungus
author_rank: Super Contributor
timestamp: July 05, 2017, 12:05:21 am
content: Measure the current going in (amps)... is it normal?
What is the right footprint for irregular components? - Page 1
Forum section: electronics / projects

author: crgarcia
author_rank: Regular Contributor
timestamp: August 18, 2022, 09:28:09 am
content: Hello!I have found few THT components that have some irregular shapes towards the PCB (no clue how to call them).For example this relay (datasheet link)or this PCB fuse holder (datasheet link)What is the right footprint for that? should I make cuts in the PCB for those plastics and thicker parts of the pins to go through?Thanks!

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 18, 2022, 09:44:59 am
content: To me, neither of those parts are designed to have anything other than the pins going into holes in the PCB.For a start, the recommended footprint for the relay does not include any other holes, so the other pegs are obviously there to maintain a certain spacing from the board, given that the pins taper outwards near their base.The fuse holder 'foot' is obviously part of the body and not a locating peg. I'm not sure why anybody would imagine that part is supposed to slot into the board.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 18, 2022, 10:16:56 am
content: Same here, perfectly normal to me, they can act as standoff, create space etc ... just need to design the pads / vias / traces for the pinsthe space are sometimes voluntarily created for the board(s) cleaning products, it will go far enough to do a proper job, and remove flux ...

author: crgarcia
author_rank: Regular Contributor
timestamp: August 18, 2022, 10:20:21 am
content: Thanks for the answer!Your opinion is aligned with all the footprints I found online for those parts - so it is very luckily that you are rightI was not sure what is the reason for that spacing between the board and the component. Why would a manufacture want such space?I did not think on cleaning flux, but it makes sense. Maybe coating could be another similar reason
What is the signal protocol for 12v 1 dataline 1 color led strips - Page 1
Forum section: electronics / projects

author: drakejest
author_rank: Regular Contributor
timestamp: November 08, 2020, 09:56:42 pm
content: I would like to use one ofthese (RGBW STYLE 2)for my 5v WS2812B. The problem is that controller spits out 12v and for sure will destroy my 5v WS2812B. Since i could not find a version for the 5v WS2812B i would like to create a signal converter using a microcontroller. Since this controller spit out signal for the 5050 leds strips, i thought i could simply decode the signal and make it suitable for the ws2812b (After level shifting it of course ).Where im stuck with is i could not find information the protocol 5050 led strips are using, i know that each color has its own data line and in that data line the brightness value is sent. I have already understood how a single dataline led strip work with the help ofthis thread. I could not find info though on the separate datalane for each color.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 09, 2020, 02:44:15 am
content: theses controls are not for ws2812 led strips, tehy control separate r g b w lines, not data lines

author: drakejest
author_rank: Regular Contributor
timestamp: November 09, 2020, 12:18:23 pm
content: Quote from: coromonadalix on November 09, 2020, 02:44:15 amyes thats why im going to make a microcontroller that will act as a middle man converting the signals. But first i have to understand whats happening on thos RGBW lines, Are they digital being pulsed or analog?

author: Ian.M
author_rank: Super Contributor
timestamp: November 09, 2020, 12:34:11 pm
content: It says "4 channel constant voltage PWM output", which means its designed to work with 'dumb' LED strips, where all the LEDs of the same colour light up together, as the individual LEDs don't have any integrated control electronics.From the connection diagrams it would appear its outputs are PWMed low side open drain power MOSFETs.
What is this - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: May 04, 2019, 06:34:56 am
content: HiDoes anybody know what the 2 items are in the pictures attached. It is some sort of switch. Only one of them can open as shown in the pictures. The other unit with the 3.7kw sticker on is sealed.Does anybody recognize these components i.e. function, equipment in which it is used or brand.Thanks

author: Gyro
author_rank: Super Contributor
timestamp: May 04, 2019, 10:58:14 am
content: If those are pipe connections going in underneath then it looks like a pressure switch with microswitch style snap action contacts. Try blowing through the input ports as see if it actuates.It might possibly be for those pneumatically operated foot switches. From the condition of the contacts it looks new.

author: Miti
author_rank: Super Contributor
timestamp: May 04, 2019, 11:42:03 am
content: They look like differential pressure switches.

author: Cicada
author_rank: Regular Contributor
timestamp: May 06, 2019, 07:52:49 pm
content: Hi.Thanks for all the replies.Ok here is some more photos.This looks like a heating element inside the body with ceramic tubes around it. I do not know by what mechanism the contacts are operated. When the contacts are closed current will flow though the heating elements from the one blade terminal to the other. Keep in mind there are O rings sealing the inside of the body where the heating elements sit.I have no idea what this is. Would be interesting top know.

author: max_torque
author_rank: Super Contributor
timestamp: May 06, 2019, 09:01:42 pm
content: Looks like some form of resitive water heating device, possibly with a pair of bi-metalic switches to either avoid the device burning out (if there is too little water flow) or to actually control the water outlet temperature? These sorts of things are used in showers and forother similar "low temperature" water heating

author: Gyro
author_rank: Super Contributor
timestamp: May 06, 2019, 09:35:16 pm
content: Hmm, I'm not sure what kind of heater would allow the water (or fluid) into contact with the 'element', but then, why the seal. There must be something actuating the switch contacts too - which I can't see. Thermal expansion of the coils?

author: amyk
author_rank: Super Contributor
timestamp: May 07, 2019, 01:34:32 am
content: https://www.dafi-water-heater.com/en/dafi-ipx4-accessories-spare-parts/53-dafi-ipx4-230v-heating-element-of-the-heater.html

author: Gyro
author_rank: Super Contributor
timestamp: May 07, 2019, 08:55:41 am
content: Wierd!Ratings between 3.7 and 7.3kWI still don't understand how they achieve electrical isolation, it would surely trip an RCD (/ human body)?

author: Cicada
author_rank: Regular Contributor
timestamp: May 09, 2019, 08:47:14 pm
content: Quote from: amyk on May 07, 2019, 01:34:32 amThis does indeed look like a water heating element as ? has indicated.Thanks
What is this 3-pin SMD component - Page 1
Forum section: electronics / projects

author: INZAMAM
author_rank: Newbie
timestamp: August 15, 2025, 08:50:49 am
content: "Hi everyone,Any help would be greatly appreciated. Thanks!"

author: Vovk_Z
author_rank: Super Contributor
timestamp: August 15, 2025, 09:53:43 am
content: Try to search only three symbols from that code, like G8A.(It may be AO3400 MOSFET).

author: NE666
author_rank: Frequent Contributor
timestamp: August 15, 2025, 10:27:31 am
content: The clue here is likely the "VT3" designator on the silk screen, standing for 'Voltage transformer'.i.e. It's probably a three terminal voltageregularregulator. Which one, that's harder. If you know, from its context, what it's supposed to be doing, then there's probably scope for replacement with an equivalent.

author: BennoG
author_rank: Frequent Contributor
timestamp: August 15, 2025, 11:37:43 am
content: https://www.s-manuals.com/smdThere are more sites you can look for but according to this it can also be a voltage regulator.Benno

author: fzabkar
author_rank: Super Contributor
timestamp: August 15, 2025, 12:43:48 pm
content: Show us VT1 and VT2 and VT4, etc. That may help us to confirm the function.

author: gamalot
author_rank: Super Contributor
timestamp: August 15, 2025, 01:40:28 pm
content: Quote from: NE666 on August 15, 2025, 10:27:31 amVT most like standing for transistor to me.

author: gamalot
author_rank: Super Contributor
timestamp: August 15, 2025, 02:53:59 pm
content: The closest part I could find was the Si2387DS from Vishay.https://www.vishay.com/docs/63025/si2387ds.pdf
What is this? A SMD coil with shield? An odd tripod? - Page 1
Forum section: electronics / projects

author: cybermaus
author_rank: Frequent Contributor
timestamp: August 24, 2021, 11:19:40 am
content: Is there a "help identify this component thread"I looked around, did not find any obvious locationAnyway, I admit to being not extremely experienced, but I thought I at least recognised most stuff to at least what base component category they are.The diody-lookin thing with the weird middle connection.What is this? It is part of a Ultrasonic driver board, I have two, one working and one not, so I was comparing.This component measures the same on both. Also, the previous repair (not by me) is on the good board.So I think the component is not related to the problem. But what is it?Some sort of coil with a shield? A Diode with a third connection. A Triode? but I only know those from tubes, but also a general name, I think any tri-leg transistor is called a triode.The middle part is connected to ground.It is near a 7805, but I think that is unrelated.BTW: I did find and replace two IRS21844S half H-bridge drivers that I am sure were wrong (cause internally shorted)The linked FET's IRFPS37N50A measured all correct, which is a good thing because I cannot find them anywhere. Not sure what blown the drivers without blowing the FET's, but the boards now all measure the same. Anyway, that is just an aside, this "triode" is nowhere near the power secion.

author: branadic
author_rank: Super Contributor
timestamp: August 24, 2021, 11:38:19 am
content: It's called T-filterhttps://www.reichelt.de/index.html?ACTION=446&LA=0&nbc=1&SID=95ee6373818e69f842628f6a58cad2540fc88f68ad160a44a5041&q=smd-entst%C3%B6rfilterhttps://www.reichelt.de/index.html?ACTION=446&LA=446&nbc=1&q=chip%20emi%20filter-branadic-

author: cybermaus
author_rank: Frequent Contributor
timestamp: August 24, 2021, 06:58:23 pm
content: Ok thanks. I have seen the filters that look more like a normal SMD block. Not this form.Anyway, not relevant to the component ID, but the ultrasonic works again with the new pair of IRS21844S
What is this adaptor Dave J. is using here? - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: September 13, 2024, 09:27:44 am
content: HiI would love to have such an Scope probe adaptor to BNC as shown in this video at time 14:38I use tektronics probes.Please not I am referring to the adaptor into which the scope probe, without it's cap, plugs into.Perhaps there is an adaptor like this that plugs into male BNC plug.Regards,Cicada.

author: Phil1977
author_rank: Frequent Contributor
timestamp: September 13, 2024, 09:51:03 am
content: I just know the SMA-counterpart:(Source:https://de.farnell.com/beehive-electronics/0309-0001/adapter-sma-jack-probe/dp/2786216)Unfortunately Farnell wants a quite professional amount of money for it. Does anyone know this for a more reasonable price?

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 13, 2024, 09:59:07 am
content: I have it. it is an accessory for a Tek THS3000.I think it is expensive.

author: ttelectronic
author_rank: Regular Contributor
timestamp: September 13, 2024, 10:01:20 am
content: Probe to BNC adapter CT2708 (Cal Test) Cal Test is a reasonably priced brand.BNC ADAPTER 5MM NONTERMINATED(5mm seems most common)

author: sharow
author_rank: Contributor
timestamp: September 13, 2024, 10:51:27 am
content: I saw this on Probe Master site. see 4987BA, 4952BA.https://probemaster.com/oscilloscope-probes/4900-series/accessories/But I think it's made for specific probes. Not universal.

author: ajb
author_rank: Super Contributor
timestamp: September 13, 2024, 02:48:38 pm
content: Yeah, there is some variety in the diameter of both the probe tip and the grounding sleeve, so the adapters are somewhat specific. I have a set of the Cal Test CT2708, and they just barely work with some Rigol probes with a 4.7mm sleeve diameter if you squish the contact leaves a bit. I don't know how consistent the dimensions of Tek probes are, so the OP may need to take some measurements first. Whatever adapters Tek sells, there's a good chance they're available directly from whoever makes them, or under a different brand, at a better price.