hybridfree/eevblog-posts huggingface dataset:
Ideas needed for a Ping and Reboot unit, - Page 1
Forum section: electronics / projects

author: akanowitz
author_rank: Contributor
timestamp: August 28, 2013, 04:58:06 am
content: Hi everyone,Hoping you can help out, I am looking for a device or something I can run on a PC that will ping an IP every 15 mins or so. If it does not get a reply , it must power cycle a USB relay or similar to cut power to that device being pinged and allow it to restart. Any ideas would be appreciated.Many thanksAlan

author: Psi
author_rank: Super Contributor
timestamp: August 28, 2013, 05:31:27 am
content: Do a google search for PC watchdog relay

author: IanJ
author_rank: Unknown
timestamp: August 28, 2013, 10:55:48 am
content: Hi,I did more or less what you're asking for but using an Arduino. I needed to monitor a Draytek modem to see if it had hung, and if it had it would automatically recycle the power to it via a relay.http://www.ianjohnston.com/index.php?option=com_content&view=article&id=75:modemmonitor&catid=3:hobbies&Itemid=8- Monitor Status- Current Ping Time- Output Power Status- No. of resets recorded- Minutes since last two resets- Timing indicator (seconds)Here's a couple pics of it in operation:Ian.

author: akanowitz
author_rank: Contributor
timestamp: August 28, 2013, 11:40:17 am
content: Hi Ian,That's exactly what I am looking for, any rough guestimate on the cost ?Many thanksAlan

author: IanJ
author_rank: Unknown
timestamp: August 28, 2013, 12:33:10 pm
content: Quote from: akanowitz on August 28, 2013, 11:40:17 amHi,No idea.....I just made it from bits n pieces......but it can't be expensive.....it's just an Arduino with an ethernet shield & LCD, and a few other bits n bobs.The BOM is on my webpage.....as is the Arduino code, wiring etc.Ian.

author: Ziltoid
author_rank: Contributor
timestamp: August 28, 2013, 03:35:32 pm
content: if your router supports openwrt or ddwrt try those. Before doing this with the arduino like Ian i would consider buying a router which supports one of those (TP-Link 1043) the cost would be i think roughly the same.

author: tszaboo
author_rank: Super Contributor
timestamp: August 28, 2013, 07:02:23 pm
content: If your PC has a parallel port, you can just connect it to a relay, with a simple transistor/FET relay driver circuit, and a cheap 12V power supply. After that it is just programming of something like 5 lines of code in batch. If the computer doesn't have parallel port, buy an USB paralel for 3 dollars.
Ideas on conducting complex-design reviews - Page 1
Forum section: electronics / projects

author: tmadness
author_rank: Regular Contributor
timestamp: October 26, 2020, 09:23:12 pm
content: Every electrical engineering firm conducts design reviews. Some do it better than others. Lets say that there's a reasonably complex design, say 8+ layer board 1000+ components, analog components + digital components etc. Medium size firm 20-30 relevant engineers, I am the lead for this project. The design has moved from proof of concept to prototype to now, REV A. I have 5 engineers who hare now pretty familiar with the project, they have helped me squash a number of bugs, but, I am the sole designer: from design to layout to some firmware (higher level stuff is another department).What have your experiences been in a similar situation? what review systems worked? what didn't ? Should I assign subsections to review to other engineers based on their experience?

author: StefanHamminga
author_rank: Contributor
timestamp: October 27, 2020, 08:57:05 am
content: My 2¢: Interview your reviewers, make a checklist (of the underlying design criteria). Repeat regularly to improve the checklist.

author: sandalcandal
author_rank: Unknown
timestamp: October 27, 2020, 12:30:14 pm
content: There's an entire discipline focused on this task (and associated activities)https://en.wikipedia.org/wiki/Systems_engineeringEven then systems engineering is just a set of tools. The real tool and the one that really matters is the one behind the wheel.Level of control and bureaucracy depends on the project and how much risk needs to be mitigated.Having high level systems design for any remotely complex project helps keep things organised and in check.Systems design is particularly helpful for splitting up and delegating work effectively but has potential to be done poorly and hamper overall progress; as the sole designer/lead you're probably the most qualified to be handling this.An exhaustive, enumerated list of system requirements is excessive in most non-critical applications, having an organised list of requirements is still handy though. I'd split up customer/user requirements vs subsystem specifications at the very least.Like any activity involving multiple individuals, good communication is number one.If nothing else, the tools used in systems engineering are communication tools.There's usually a trade-off between time and effort used to create documentation and other communications vs the benefits they bring in terms of lubricating and directing work to be more efficient.
Datalogging ESP32 carrier board with LiPo power management WIP - Page 1
Forum section: electronics / projects

author: bsodmike
author_rank: Regular Contributor
timestamp: November 12, 2020, 01:51:38 pm
content: Hi all,Please checkout a work in progress, which I've called the "Multipurpose Carrier" board.https://github.com/bsodmike/MicroMod_Multipurpose_Carrier_BoardIf you haven't heard about MicroMod, checkout the concept here:https://www.sparkfun.com/micromod- Essentially, "Processor" modules are designed to fit the M.2 socket (which typically has been used for nVME storage).Anyone with a keen eye will notice my schematic is largely a mash up between the Input/Display and Datalogging carrier boards - and yes, you're right, apart from a few tweaks. Some of the more important changes:- Switching the ATtiny to an ATMega328P, the idea here is that this chip can be used to drive "complex" menu systems and deal with handling user input. It would connect with the main Processor over I2C.- Both the Processor and ATMega can communicate with the micro-SD over SPI.- External FTDI port to connect to the ATMega chip.- More ports on the MicroMod connector have been broken out.- USB_D+/D- connect to the MicroMod connector, U0TXD/U0RXD also connect to the MicroMod connector.- I've added the ESD protection chip onto the USB data lines (taken from previous SFE designs).Check the Github repo for details.Let me know your suggestions and if you'd like to help out, that would be great!

author: bsodmike
author_rank: Regular Contributor
timestamp: November 13, 2020, 01:15:24 pm
content: I'm going to make a small addition to allow monitoring the charging and/or power-supply from the LiPo battery.It would be useful to be able to send notification via Wifi if/when the battery charge drops to around say 5-10%.

author: bsodmike
author_rank: Regular Contributor
timestamp: November 13, 2020, 02:40:57 pm
content: I've used this current sense resistorhttps://export.farnell.com/vishay/wfmb2010r1000fea/res-0r1-2w-2010-metal-plate/dp/3102723RLand this current-sense amplifierhttps://export.farnell.com/texas-instruments/ina240a1pwr/current-sense-amplifier-400khz/dp/3005360To allow measuring of the LiPo current when it is powering the circuit. A closeup from the schematic is attached.
Ideas on how to split a 2V sine wave into separate negative and positive waves? - Page 1
Forum section: electronics / projects

author: drdanke
author_rank: Contributor
timestamp: August 10, 2016, 05:09:27 am
content: I'm trying to design an audio circuit, where a 2V peak to peak sine wave (no dc offset) needs to be split into the separate top and bottom halfs of the wave, negative and positive, for further processing.How would this be possible? I've tried diodes (as the voltage drop would be acceptable), but the common ground on the separate outputs, has the signals coming back together, and the sine wave is a little distorted at 0V. Is it possible, to separate the negative and positive halves of the waves, and then put them back together?My other idea is possibly using a tiny center tapped 1:1 transformer?I'm fairly new to electronics, so I apologize if this is an elementary issue I'm asking about. Pointing me in the right direction would be all I need, so then I can do the technical research myself.Thanks!

author: Vgkid
author_rank: Super Contributor
timestamp: August 10, 2016, 05:26:30 am
content: What about using 2 ideal half wave rectifiers. One set up for the positive half, the other for the neg half.

author: drdanke
author_rank: Contributor
timestamp: August 10, 2016, 05:38:57 am
content: Thanks, nice info. I googled that and found op amp based high-precision diode half wave rectification. Definitely something I will throw on the breadboard and check out on the scope after doing more research.

author: Keicar
author_rank: Regular Contributor
timestamp: August 10, 2016, 05:45:19 am
content: I think you could implement this using a single op-amp, even - with two feedback paths, each containing a diode biased in either direction.

author: Dave
author_rank: Super Contributor
timestamp: August 10, 2016, 08:05:30 am
content: This exact question was posed less than a month ago.Here's my solution.

author: drdanke
author_rank: Contributor
timestamp: August 10, 2016, 03:06:33 pm
content: Thanks Dave, this solution does seem to fit my needs nicely, and thank's for showing a complete circuit in Ltspice so I can see it implemented. Seems like all I need to change will be to delete the bottom half, mirror the top part, with reverse diodes for the negative wave half.

author: danadak
author_rank: Super Contributor
timestamp: August 10, 2016, 08:34:14 pm
content: Here is a single OpAmp sign changer thats clever, see attached.Regardsm Dana.

author: Dave
author_rank: Super Contributor
timestamp: August 11, 2016, 09:32:27 am
content: Quote from: drdanke on August 10, 2016, 03:06:33 pmOops, seems like I haven't read your requirements carefully.The OP of the thread I linked wanted both half-waves to be positive. I only now read that you want both to keep their respective polarities, just have them separated.Copying the top part of my circuit and flipping the diodes will essentially give you the solution that Vgkid suggested.
Ideas please, how to measure distortion due to rectified currents in classAB amp - Page 1
Forum section: electronics / projects

author: Kokoriantz
author_rank: Frequent Contributor
timestamp: April 25, 2025, 07:47:58 am
content: Prof. Edward Cherry from Australia, brought this subject in the 80'shttps://linearaudio.net/sites/linearaudio.net/files/Cherry%20mutual%20inductance%20distortion_0.pdfThe proposed solution is applied in all amp design since.In 1972, I, son of TV repair, encountered a problem with a Sansui receiver that a customer was complaining that a song from the Turtles, Happy together refrain,sounds very clean with his old radio/pick up but dirty with his new Sansui.Later, I found a great number of music that sound bad only with classAB amps the most notorious is the Verdi's Dies Irae.When I was pushing the NFB to 70db@20khz, I was resolving the problem until I found the problem is due to rectified current feedback is the culprit.By proper layout and adding a resistor of 0.5 ohm in series with the common ground of Cherry's 470uf rail capacitors, the sound becomes excellent.Now, I want to find a way that I can measure such distortion.Bellow is on youtube 6 versions of Verdi,https://youtu.be/Mo22KhenMS4?si=zLqRA7S7nyzv5OY0Listen to it by headphones first then by a classAB amp and see it gives you any idea how to generate such a complex signal and measure the distortion.
Ideas regarding a UPS problem - Page 1
Forum section: electronics / projects

author: aroby
author_rank: Regular Contributor
timestamp: March 09, 2014, 10:47:14 pm
content: I have an APC rackmount UPS, circa 2008. I picked it up used and it was supposed to be working (!).First off, it was showing an AVR relay weld fault. I took the board out and there is a row of relays, so I tested all of them and determined that the main power relay wasn't working - one of the switches in it didn't switch. So I replaced that and everything now works. The front panel shows that AVR trim is active (the input power is a bit high), the batteries charge, if you disconnect the power it switches over to battery. And I connected it up to the APC Powerchute software and it shows me the input and output voltages, the event logs etc. Everything looks great.The only problem is, there is no power coming out! There are 2 banks of battery backed outlets and a separate outlet with no battery backing. All of them have about 2.3-2.5V AC coming out of them. This is a 230V UPS, so the output is 1/100 of what it should be. I'm at a loss to begin tracking down the problem.Anyone have any ideas of where I should start looking? There's clearly something wrong between where the power is being measured by the on board instrumentation and it reaching the output, but I don't know what to look for to track that down.Thanks for any ideas!Anthony

author: jsquaredz
author_rank: Contributor
timestamp: March 11, 2014, 11:57:37 pm
content: Sounds oike the rectifier is working but msybe not the inverter. Check for output at the scrs or igbt. Also the gate driver board to see if there is signal going to the oower components if they arent firing.

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 12, 2014, 02:08:20 am
content: Make sure it's not a simple problem like a blown output fuse or bad/missing/incorrect connection.

author: David_AVD
author_rank: Super Contributor
timestamp: March 12, 2014, 02:27:52 am
content: Or possibly another faulty relay (power output) ?

author: aroby
author_rank: Regular Contributor
timestamp: March 13, 2014, 12:29:47 am
content: Quote from: NiHaoMike on March 12, 2014, 02:08:20 amI double checked those. I actually don't see an output fuse, but the power coming off the board connectors is just 2.5v AC

author: aroby
author_rank: Regular Contributor
timestamp: March 13, 2014, 12:31:54 am
content: Quote from: David_AVD on March 12, 2014, 02:27:52 amI guess that's a possibility. I'll have to disassemble it again and test them out. Unfortunately they are all proprietary parts. I'll take a look after Spring Break.

author: jsquaredz
author_rank: Contributor
timestamp: March 16, 2014, 10:52:13 pm
content: I just noticed you are talking about AVR relays. I assume those are relays for switching taps on a buck/boost transformer? When I ready that this was a rack mount I just figured it was a double conversion UPS. Sounds like its an offline or line interactive UPS. What model # do you have?
Ideas to activate device after mounting it the ground - Page 1
Forum section: electronics / projects

author: mrburnzie
author_rank: Regular Contributor
timestamp: April 07, 2020, 02:21:47 pm
content: I have a product that is mounted in the ground. It is using sensors which need to be calibrated after put into the ground. It uses LoRaWAN to communicate. It is very low power device. The case is fully sealed (IP rating).My concern is after it gets assembled, I don't want to turn it on, because it will stay in stock for a while which will drain the battery, so the solution is to turn it on just before it gets mounted.Because the case is sealed, what are the methods to turn on the device?What are the easiest methods to solve something like this?Thanks!

author: max_torque
author_rank: Super Contributor
timestamp: April 07, 2020, 02:32:18 pm
content: I've seen people use a magnetic read switch to turn on power to a device when it's needed, where you place a magnet in the correct spot on the outside of the device to pull the read switch contacts together so the unit gets power. I've also seen orientation switching, where a ball bearings falls across contacts when the unit is the correct way up, and you store it "up-side-down"........

author: mrburnzie
author_rank: Regular Contributor
timestamp: April 07, 2020, 02:33:24 pm
content: Yes, I was thinking of the magnet too, but the upside down thing I didn't! Not a bad solution!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 07, 2020, 06:47:17 pm
content: same thing for a magnet you have some door alarms switchs who could do the job

author: max_torque
author_rank: Super Contributor
timestamp: April 07, 2020, 07:17:06 pm
content: Search for "rolling ball tilt switch" or variations on that theme!

author: coromonadalix
author_rank: Super Contributor
timestamp: April 07, 2020, 10:03:41 pm
content: mercury switch ??
Ideas wanted on ARM9 SoC - Page 1
Forum section: electronics / projects

author: blueskull
author_rank: Unknown
timestamp: February 16, 2020, 04:26:16 pm
content: I've recently came across an AllWinner SoC, F1C200S, which is a 450MHz/600MHz (@1.1V, OC to 900MHz@1.2V) ARM9 SoC with 64MB of DDR RAM integrate in package, so it's basically a full ARM9 module on its own.It has only 88 pins, and among them power, audio codec, composite video codec, USB, boot ROM, SD card, boot console UART and LCD interface w/ resistive touch took 79 pins, so only 9 pins are available for connecting peripherals.The best I can do is to bring out one I2C, one SPI/UART and one I2S. If I try, I can bring out one more SPI and UART, at the cost of boot ROM (for SD-less boot) and boot console. After that, there's zero expandability.What can I do with this interesting chip? An HMI? Or what? I was thinking of using Linux's superb networking capability to make it some sort of IoT gateway or at least data aggregator, but then it doesn't have WiFi nor Ethernet MAC, so I will have to connect an ESP8089 or USB NIC to get network, and then I will lose either SPI ROM or SD card or USB due to pin conflict.I can try to hook it up to an ESP32, but then the actual gateway would be the ESP32, and the ARM9 will be sitting there doing nothing. After all, I don't want to waste time writing a proper SPI NIC driver on both chips, nor do I think the lame 115.2k (limited by ARM9's UART controller) AT modem interface is going to do anything meaningful.I just can't see how can I make use of it, but it is indeed an interesting little chip, perfect for HMI, but really not anything more for anything else.What's your opinion on this thing, and how do you think I can make use of it?

author: taemun
author_rank: Regular Contributor
timestamp: February 17, 2020, 12:29:43 am
content: I think you've hit the nail on the head - HMI seems like the best application, if limited to 1280x720. You might be able to use an ESP32-S2 over USB - although I'm not sure on the state of software support for it from Linux. I don't know whether it can act like an ESP8089 style NIC.

author: Lowku
author_rank: Newbie
timestamp: May 03, 2023, 09:41:44 am
content: Hi SirI saw your post from 2020,Just curious if you ended up using the F1C200s for anything or got any ideas from the post or subsequent research?I want to design a small SBC that has internet either Ethernet or WiFI and potential HDMI to control a very basic Kiosks UI and send some data to a server.
Identical opamp circuits..but one has split supply, other has single supply. - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: November 14, 2017, 09:11:10 pm
content: Hello,The following two opamp circuits (schematic attached) are exactly the same except for the fact that one has a 5V single supply and the other has a +/-5V dual supply. They both have the same shape of input signal which is also shown attached.The opamps are LT1013's (not MCP6001s as i stupidly previously said)LT1013 datasheet:http://cds.linear.com/docs/en/datasheet/10134fe.pdf(MCP6001 datasheet deleted)If the circuit is made on a PCB, will the outputs be exactly the same for each of the circuits?LTspice simulation also attached but it is not thought that it will be completely accurate

author: jaromir
author_rank: Unknown
timestamp: November 14, 2017, 09:23:41 pm
content: Quote from: treez on November 14, 2017, 09:11:10 pmNo, because the +-5V powered MCP6001 will release magic smoke, as its absolute maximal power supply is 7V.

author: ocset
author_rank: Super Contributor
timestamp: November 14, 2017, 09:27:59 pm
content: Thanks, sorry, i meant LT1013 opamps, ive now edited the top post

author: eblc1388
author_rank: Frequent Contributor
timestamp: November 15, 2017, 08:30:41 am
content: Quote from: treez on November 14, 2017, 09:11:10 pmOf course not.In the single supply version, the output of U1 cannot reach zero volt(only within ~60mV) as with the same for U2 output. It is the main reason why people opt to use dual supplies if they want a true zero volt output.Quote from: treez on November 14, 2017, 09:11:10 pmIf the simulation results differs from your expectation, as is in this case, and you infer that it is the limitation of LTspice, then you are shifting the blame.

author: jaycee
author_rank: Regular Contributor
timestamp: November 15, 2017, 12:49:18 pm
content: If your input signal is never going to go negative, you can use a single supply opamp. However as others have said, the output will not go completely to 0V.. the LT1013 will get pretty close though as it is specified for single rail usage. Many opamps are not "rail to rail" though.
SMC Component Identification? 3F OM - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: August 23, 2021, 10:22:13 am
content: Please could someone identify this SMD... looks like "3F" "OM"?P-type FET or Voltage Regulator?It seems... I think... to behave like a 3V5 regulator?Thanks in advance

author: amyk
author_rank: Super Contributor
timestamp: August 24, 2021, 12:37:33 am
content: XC62AP3502PRUnfortunately no datasheet can be found, but it is an LDO as you have discovered.

author: robson2017
author_rank: Contributor
timestamp: August 24, 2021, 04:31:38 am
content: Hi,maybe it help you.

author: amyk
author_rank: Super Contributor
timestamp: August 24, 2021, 01:31:33 pm
content: Quote from: robson2017 on August 24, 2021, 04:31:38 amThat's not XC62AP series, but XC6201, please don't misname datasheets.
Identification of a connector used for MIPI interface - Page 1
Forum section: electronics / projects

author: IO390
author_rank: Regular Contributor
timestamp: November 10, 2018, 08:51:02 pm
content: Hello all,I'm hoping someone on here knows what connector this is:It is board-to-cable and the cables are shielded. They are tiny.They are used extensively in DJI products for the MIPI interface from the camera sensor to the motherboard. Have searched high and low to no avail.

author: kony
author_rank: Regular Contributor
timestamp: November 10, 2018, 08:54:20 pm
content: Looks like I-PEX to me.
Identification of fuses/polyfuse - Page 1
Forum section: electronics / projects

author: laban93
author_rank: Contributor
timestamp: November 25, 2024, 05:23:44 am
content: Hi all!I need to identify the rating of what i believe is a polyfuse. in my case it's 2 then WM then 2 like thishttps://static.rapidonline.com/catalogueimages/product/26/15/s26-1560p01wj.jpgI see online that there are many different markings amongst the different manufacturers, but the one i need has the overlayed WM markings. Is there any spreadsheet or lists that shows what these translate to? Attached a couple of snipps of those i see online.

author: Psi
author_rank: Super Contributor
timestamp: November 25, 2024, 07:29:33 am
content: The brand marking looks like Littelfuse Inc.https://www.digikey.co.nz/en/products/detail/littelfuse-inc/SMDC125F-33-2/6348198
Identification of heatsink profile - Page 1
Forum section: electronics / projects

author: fastbike
author_rank: Regular Contributor
timestamp: February 26, 2023, 11:56:20 pm
content: I'm looking for an extruded heatsink like the one in this image.It has a row of 8x TO-220 devices attached via a clip system. The width is around 41mm, and the height from the (separate) cylindrical attachments is 26mm.The current piece has been cut to 96mm to fit within a DIN rail mounted Phoenix Contacts EMG enclosure.
Identification of two electronic components - Page 1
Forum section: electronics / projects

author: luiHS
author_rank: Frequent Contributor
timestamp: September 18, 2024, 06:50:56 pm
content: HelloCould someone tell me what these electronic components are?They are both on the control board of a large double-door Siemens refrigerator.One of the components, on the other side of the PCB, has a symbol of a resistor and a capacitor connected in serial, but I don't know what this component is called and value to buy it (may be 0.1uF + 120 Ohm).

author: wraper
author_rank: Unknown
timestamp: September 18, 2024, 06:54:16 pm
content: Second is a snubber, 100n capacitor + 120 ohm resistor in single package.

author: factory
author_rank: Super Contributor
timestamp: September 18, 2024, 07:14:27 pm
content: Snubber was made by Daewoo, but rather unfortunate for them to use a part labelled BSE in a fridge.Other component labelled DSA looks like a resistor, but encased in glass for some reason.Actually a surge absorber, possible datasheet here;https://docs.rs-online.com/6006/0900766b813b84ba.pdfDavid

author: wraper
author_rank: Unknown
timestamp: September 18, 2024, 07:19:58 pm
content: ^I first thought it was a resistor. However it's unlikely that sealed resistor would be used in refrigerator. Also dark bands seem to be separate rings in parallel, not spiral you'd see in resistor.

author: factory
author_rank: Super Contributor
timestamp: September 18, 2024, 07:26:00 pm
content: Yes definitely not a resistor.From the RS webpage for a Mitsubishi part it seems to be a gas discharge tube, to be used with an external varistor or resistor.https://uk.rs-online.com/web/p/gas-discharge-tubes/5258894OP probably needs to check all the markings on the glass, to find out more.I'm sure I've seen similar looking glass parts in a DMM.David
Identification of unknown SMD ICs - Page 1
Forum section: electronics / projects

author: stevenhoneyman
author_rank: Regular Contributor
timestamp: May 02, 2015, 01:06:40 pm
content: Are there any "standard" ways to identify SMD parts that are marked with partial names, or codes? I'm familiar with the various sites that offer lists for 3-pin transistors, voltage regs, and similar; but for higher pin count parts that you might find in laptops etc - is there a similar resource somewhere?Some of the time I can have a guess and then confirm via datasheet, based on pin connections, position of a crystal or reset circuit. But as an example, this remains a mystery to me (attached image). Itcouldbe an atmel mcu, or it might be some random ASIC/battery charge controllerThen there's stuff that's produced/rebadged for manufacturers (Realtek/Dell for example)...

author: amyk
author_rank: Super Contributor
timestamp: May 02, 2015, 02:23:50 pm
content: No, other than some creative Googling and based on what/where the part is connected.

author: DanielS
author_rank: Frequent Contributor
timestamp: May 02, 2015, 04:24:03 pm
content: When you have markings that do not appear to match anything, possibly re-branded/marked, your best bet is reverse-engineering the circuit to determine the function and then go through parts that match the packaging to find a match. It can get quite time-consuming, especially when you are not familiar with chips for a given function in that specific packaging, but when markings do not line up with anything sold as such, this can quickly end up being the only option.
Identify 6 pin PCB male connector - Page 1
Forum section: electronics / projects

author: David_AVD
author_rank: Super Contributor
timestamp: May 25, 2016, 06:25:41 am
content: I'm sure I've seen these board connectors but can't seem to find them on Digikey or Mouser.They are 0.1" (not 2.5mm) as best I can measure. Anyone know the series ?

author: David_AVD
author_rank: Super Contributor
timestamp: May 27, 2016, 06:12:14 am
content: No takers ?

author: Fraser
author_rank: Super Contributor
timestamp: May 27, 2016, 10:39:00 am
content: Looks like a pretty standard format as was used on older (non ATX) PC motherboards. You need to include some dimensional data in order for anyone to help you though.Fraser
Identify a MOV? - Page 1
Forum section: electronics / projects

author: blazini36
author_rank: Regular Contributor
timestamp: April 15, 2024, 02:18:31 pm
content: I ordrered a bunch of resistors and they mistakenly gave me a big bag of MOVs, like a couple hundred. I've been looking for a datasheet for these as I could possibly use them for something but I can't find these specifically. The markings are:221J1KVTDKCouldn't get a good picture of the markings themselves but there's nothing fancy to identify them otherwise. Anyone have any idea where I can find the actual datasheet for these?

author: TimNJ
author_rank: Super Contributor
timestamp: April 15, 2024, 02:23:50 pm
content: Are you sure that's not a 220pF 1KV capacitor? MOVs would usually have a different naming structure.

author: blazini36
author_rank: Regular Contributor
timestamp: April 15, 2024, 02:29:27 pm
content: That's quite possible. I tried to measure capacitance with my bench meter but got nothing. I'm not familiar with this type of capacitor so I didn't realize it would have such a small value. I could try ranging it down and checking again......was really hoping it was a MOV lol. Don't have any use for disk capacitors.

author: coppercone2
author_rank: Super Contributor
timestamp: April 15, 2024, 02:39:29 pm
content: those high voltage capacitors are what you want for a HV esd filter (preferably with R) in the most robust package (through hole leaded)100VDC cap for HV protection, bit dodgy. 1kV cap for HV protection, better. It probably more robust to minor damage also. like for IO

author: blazini36
author_rank: Regular Contributor
timestamp: April 15, 2024, 02:46:54 pm
content: Quote from: coppercone2 on April 15, 2024, 02:39:29 pmWhat I was thinking about using them for was an AC servo drive. The OEM uses MOVs wired to the external AC supply connector for surge protection. I obviously didn't order these for that, but I don't suppose these would be of any practical use for that? AC supply voltage is 240V

author: wraper
author_rank: Unknown
timestamp: April 15, 2024, 02:54:29 pm
content: Just a usual 220pF 1kV ceramic capacitor. Most often can be found in SMPS snubber.https://www.lcsc.com/product-detail/Ceramic-Disc-Capacitors_TDK-CC45SL3AD221JYGNA_C1621521.html

author: blazini36
author_rank: Regular Contributor
timestamp: April 15, 2024, 02:57:33 pm
content: That link is exacly what it is, same markings.

author: coppercone2
author_rank: Super Contributor
timestamp: April 15, 2024, 03:11:40 pm
content: oh you can also probobly solder it across small DC motors in gadgets to improve their EMC performance I think. Just across the leads. Or make a more complicated snubber... but its basically required to fix import goods

author: blazini36
author_rank: Regular Contributor
timestamp: April 15, 2024, 06:08:23 pm
content: Good to know, thanks for your help
Identify a part - Page 1
Forum section: electronics / projects

author: ColinA
author_rank: Contributor
timestamp: February 02, 2012, 12:09:46 am
content: The boards I got these from were only using 6 of the 18 pins so I know what those do but would like to know what the other 12 pins do. They are a self contained clock with a programmable alarm, drop power and they go dumb.I found nothing on the web. The writing on the back is as follows:DQ463-5NO(0)jewelsCS3525
Identify a Semiconductor? - Page 1
Forum section: electronics / projects

author: Mike Warren
author_rank: Unknown
timestamp: October 15, 2020, 03:56:28 am
content: Does anyone know what this is?It's switching +12V DC to drive a relay. I'm guessing a MOSFET of some type, probably P-Ch or dual. Package is SOT23-6 or similarI've tried Googling N2 98 N2 86 N2 98 t and N2 86 t without any luck.Pin 1 is connected to +12VPins 2 & 4 are connected to +12V through a 1.6Ohm resistor and also go off to other parts of the circuitPin 3 is the output to the relay (there's a diode back to +12V)Pins 5 & 6 are connected to +12V through a 2K2 resistor and also go off to other parts of the circuit

author: james_s
author_rank: Super Contributor
timestamp: October 15, 2020, 04:23:11 am
content: Could it be this?http://www.s-manuals.com/pdf/datasheet/b/c/bc807ds_philips.pdfThat's the only one in this list in the right package.http://www.s-manuals.com/smd/n2

author: Mike Warren
author_rank: Unknown
timestamp: October 15, 2020, 04:35:21 am
content: On a first look, that appears to match.Thank you

author: Mike Warren
author_rank: Unknown
timestamp: October 15, 2020, 05:29:16 am
content: Yep, that was it. A couple of BC807s got it going again.Thanks again James.
Identify an old (mid-1970s) 10-bit ADC - Page 1
Forum section: electronics / projects

author: ballen
author_rank: Regular Contributor
timestamp: April 19, 2024, 12:45:36 pm
content: Can someone identify this ancient (circa 1975) ADC? I'm pretty sure it is from Burr Brown but might also be Analog Devices.

author: nfmax
author_rank: Super Contributor
timestamp: April 19, 2024, 04:56:19 pm
content: Too many pins for an IC package of that era. It look more like a module - perhaps from Data Translation inc. I came across quite a few of them back in the day

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 19, 2024, 05:00:13 pm
content: Could it be a TRW part?

author: ballen
author_rank: Regular Contributor
timestamp: April 19, 2024, 05:36:04 pm
content: As I recall it was a module, one of those black potted things with lots of pins, both Burr Brown and Analog Devices made many components in that style in the 1970s and 80s.Yes, it might have been TRW but I'm 90% sure that it was either Burr Brown or Analog Devices.I'm trying again for a more reasonably-sized picture and the correct alignment.[OK, that worked, also fixing it in the original post.]

author: coromonadalix
author_rank: Super Contributor
timestamp: April 19, 2024, 06:09:45 pm
content: maybe theses series ?Burr Brown ADC80AG-10 but the pin count does not matchhttps://www.ebay.com/itm/114085823505Dont forgetDateltooANALOG DEVICE had some similarities ....?

author: coromonadalix
author_rank: Super Contributor
timestamp: April 19, 2024, 06:18:40 pm
content: i got italmost lollhttps://www.analog.com/media/en/technical-documentation/obsolete-data-sheets/249731ADC1130.pdfas far my memory go 72 pins module where mostly Analog devicescant recall Burr-Brown doing the same thing ?maybe some catalogue is floating around ?https://www.analog.com/media/en/training-seminars/design-handbooks/Data-Conversion-Handbook/Chapter1.pdf@op where did you took this image ??

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: April 19, 2024, 06:53:34 pm
content: Hi ballen,Analogic?

author: mikerj
author_rank: Super Contributor
timestamp: April 19, 2024, 07:05:05 pm
content: Pretty sure it's an ADC-10QUhttps://www.analog.com/media/en/technical-documentation/obsolete-data-sheets/1482223adc12qz.pdf

author: inse
author_rank: Super Contributor
timestamp: April 19, 2024, 07:07:47 pm
content: I wonder about the strange counting order of the Bits with MSB on position 1 and LSB on 10(12)

author: floobydust
author_rank: Super Contributor
timestamp: April 19, 2024, 08:04:28 pm
content: OK I found it as what looks like Analog Devices ADC-10Z circa 1973.https://archive.org/details/bitsavers_analogDevilogDevicesProductGuide_92605624/page/90/mode/2up

author: ballen
author_rank: Regular Contributor
timestamp: April 19, 2024, 08:55:14 pm
content: Floobydust, thank you very much, this is right, the ADC-10Z is a perfect match to my diagram!
Identify and mod OVP on DELL a930p-00 PSU - Page 1
Forum section: electronics / projects

author: gs_philly
author_rank: Newbie
timestamp: April 09, 2022, 05:29:06 pm
content: Hi,Could someone help me identify and mod the DELL "a930p-00" PSU OVP/OCP to allow 14V output?There are quite a few such mods to other PSUs based on adding a resistor.Ideally I'd ask for the soldering point on the a930p-00, but even PCB schematics will helpThank you
IDENTIFY COMPONENT - Page 1
Forum section: electronics / projects

author: fabr
author_rank: Newbie
timestamp: January 31, 2025, 07:24:17 pm
content: Hi, I have opened a humidification box and found this component that has no specification. Its conduit is open for water to pass through but I can't identify what it does. It is connected to a board that gives it 11 Vac and its resistance between its supply terminals is measured in mega ohms. I suspect it may be a water pump but I have not found any pumps that run on AC power. If anyone has any idea what it might be please let me know.

author: voltsandjolts
author_rank: Unknown
timestamp: January 31, 2025, 09:06:22 pm
content: Probably a conductivity sensor, i.e. "water quality" sensor. AC drive prevents galvanic corrosion of electrodes.

author: inse
author_rank: Super Contributor
timestamp: January 31, 2025, 09:11:16 pm
content: Did you unscrew the fittings to get a peek inside?
[SOLVED] Identify component that looks like a small light bulb - Page 1
Forum section: electronics / projects

author: gmc
author_rank: Regular Contributor
timestamp: May 19, 2024, 08:37:43 am
content: I'm busy redoing a schematic in CAD from a old paper schematic on a old 12" CRT from the early 80'sOn the schematic there is a symbol I've not come across before labelled LE251.Looking at the component on the PCB it's very similar to those small Xmas string light bulbs.Can anyone identify what this component is? I don't see any value on the PCB or schematic? Is it something that doesn't have a value?Also for curiosity what does this component to?

author: Gyro
author_rank: Super Contributor
timestamp: May 19, 2024, 08:46:15 am
content: It's a Neon lamp. They are often used in CRT scopes as voltage limiters to prevent the voltage between electrodes (eg, grid and cathode) going outside specified limits during power-up and power-down. They do not normally illuminate during normal operation. They are normally just standard types, triggering at around 90V.

author: robert.rozee
author_rank: Frequent Contributor
timestamp: May 19, 2024, 08:47:13 am
content: it is a safety spark-gap, to ensure that any arcing due to any over-voltage occursoutsideof the CRT.cheers,rob :-)

author: gmc
author_rank: Regular Contributor
timestamp: May 19, 2024, 08:54:06 am
content: Thanks all. I was right in my guess that it looks like a Xmas tree light bulbGood to to know it's function

author: Gyro
author_rank: Super Contributor
timestamp: May 19, 2024, 08:57:34 am
content: Almost. Christmas tree lights are (were) filament lamps, not Neon ones.
Identify component value - Page 1
Forum section: electronics / projects

author: spanakop
author_rank: Contributor
timestamp: December 04, 2024, 10:20:53 am
content: Hi all, I have a projector that blew its lamp and also the internal fuse and a capacitor. The fuse I can change easy enough, but the cap has one side of it exposed, which happens to be the side where the values were written.My component tester and DER5000 both tell be it's around 400pF, but I don't know if I can trust these values given some of it is missing. It was placed across an n-channel mosfet and it's around 5-6mm in diameter. I've gone to the manufacturer of the projector just on the off chance they would tell me what this ought to be, but they're coming back with excuses claiming confidentially, blah, blah, blah.I know it's a long shot, but does 400pF look reasnoble for this? not sure of the voltage rating either.
Identify Connector : IDC with double bumps? - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 01, 2023, 01:35:04 pm
content: I would like to get a longer interlink cable and was about to order a 100cm IDC cable with 50 pin IDC connectors... and then I noticed that the bumps are different?Is this not IDC?Thanks in advance

author: ajb
author_rank: Super Contributor
timestamp: June 01, 2023, 02:26:37 pm
content: "IDC" just means "Insulation Displacement Connector", so any connector that punches through the insulation on the wire to make contact with the conductor is IDC.There are a few variations in the connector keying style, some are more or less standard some of them may be special order or only made by a few manufacturers. Your best bet may be to look through a few catalogs for 100mil IDC ribbon connectors and see if you can find one that matches. Take a good look at the mating headers, since those are what you need to match. You may even find that the header has snap-in keying gizmos that can be removed to accommodate different connectors if you can't find a direct match.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 01, 2023, 02:40:17 pm
content: May be easier to find one with no bumps ( or cut the centre bump off) , and just make sure it's in the right way.

author: Siwastaja
author_rank: Super Contributor
timestamp: June 01, 2023, 02:43:21 pm
content: Yeah, for one-off just cut the bump out of a standard connector and make sure you connect it the right way.

author: jmelson
author_rank: Super Contributor
timestamp: June 01, 2023, 02:44:20 pm
content: I think the double bumps is considered "military keying". There are some shrouded headers that have 3 notches so they can accommodate both styles. There is also a style that has two narrow grooves in the female connector, and the headers have slots where keying ridges can be inserted.Jon

author: newbrain
author_rank: Super Contributor
timestamp: June 01, 2023, 03:01:38 pm
content: Available from, e.g., Mouser (I had the tab open, no affiliation), also in quantity 1,XG4M-5031-T.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: June 01, 2023, 03:54:36 pm
content: Thanks all
Identify connector please - Page 1
Forum section: electronics / projects

author: Potato
author_rank: Contributor
timestamp: March 27, 2022, 05:54:14 pm
content: Can anyone identify the connector in the image please. This is on the keying cable for an MX-P50 HF amplifier.I quite like the design of the connector and would like to get several spares.

author: Potato
author_rank: Contributor
timestamp: March 27, 2022, 05:57:06 pm
content: This is the male end...

author: tooki
author_rank: Super Contributor
timestamp: March 28, 2022, 10:20:31 am
content: It’s the JST SM connector.https://www.jst-mfg.com/product/pdf/eng/eSM.pdf

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: March 29, 2022, 01:19:37 am
content: This would be the female end with male terminals.Jeff
Identify crimp tools  - Page 1
Forum section: electronics / projects

author: Cicada
author_rank: Regular Contributor
timestamp: September 19, 2020, 05:27:10 pm
content: HiI am used to this type of crimperhttps://www.schnap.com.au/tools/crimpers/heavy-duty-crimping-tool-10-120mm.htmlto crimphttps://www.google.com/search?q=25-8+lugs&rlz=1C1SQJL_enZA890ZA890&oq=25-8+lugs&aqs=chrome..69i57.4200j0j15&sourceid=chrome&ie=UTF-8The tool above crimp the lug in a hexagon shape.What type of lug / ferrule / cable joiner does the crimp tool in the attached picture crimp? It crimps in a circular shape with ridges. I suppose the ridge part goes in deeper.Does anybody have more information about these tools or what they exactly crimp? I can't see any legible brand name on it, just Asian letters and the numbers 14-20 on the smaller one and 14-32 on the other one. The smaller one has the number 16 stamped on its crimp part. I suppose for 16mm^2 and the other one 25. Although they look rough they feel quite solid and of good quality.I did good quite a lot but was not able to find a similar-looking crimper.Thank you for your help

author: Cicada
author_rank: Regular Contributor
timestamp: September 19, 2020, 05:49:13 pm
content: Update.The 16 and 25 is the distance in mm across the hole formed by the ridges/indents. So it is not the square mm area of the crimper.

author: reboots
author_rank: Regular Contributor
timestamp: September 19, 2020, 05:55:04 pm
content: Those tools may be for crimping wire rope ferrules. I've used the IWISS IWS-1608B crimper for copper ferrules, and it works well enough:https://smile.amazon.com/dp/B01A9RCOCA/Wire rope ferrules come in much larger sizes, but I don't know if IWISS in particular makes a crimper sized for your needs.

author: Cicada
author_rank: Regular Contributor
timestamp: September 19, 2020, 06:40:20 pm
content: Hi reboots.It looks like you are correct. I suppose the 3 ridges inside my crimper's mouth is to make three x swages as described in this video.at 2 minutes 30 seconds.I think the tool in the video above is of a btter quality since you make each swage seperatly. The three ridges on my crimp tool wil not go as deep into the crimped material as the better tool.It seems like your example tool IWISS is also of the type were you have to crimp each swage seperatly. Which makes me wonder. Is this tool that I have just a bad design or might it be that it looks like a tool that can be used for swaging but is actually meant for some other purpose?For now I will accept your answer aswer as correct.Thanks a lot for your reply. I looked at a couple of rigging videos now.You learn every day.

author: EntropyWizard
author_rank: Contributor
timestamp: September 19, 2020, 09:53:22 pm
content: They look like crimping tools for PEX plumbing.(likehttps://www.aliexpress.com/item/615523809.html)

author: Cicada
author_rank: Regular Contributor
timestamp: September 20, 2020, 11:04:07 am
content: Quote from: EntropyWizard on September 19, 2020, 09:53:22 pmYou are spot on. Here is the product. Thanks a lot.https://coutagroup.com.au/wp-content/uploads/2020/03/6_2018-GasPex_Install-Manual_E02.pdf
Identify diode part number - Page 1
Forum section: electronics / projects

author: JohnnyP
author_rank: Regular Contributor
timestamp: October 06, 2019, 03:53:43 am
content: I'm reverse engineering a circuit and need to know what diode they are using.It's an SMB size.In the top row it says R 1 7In the bottom row it says fpA42

author: jhpadjustable
author_rank: Frequent Contributor
timestamp: October 06, 2019, 05:09:59 am
content: If you search "smd marking r17" on the web, you may find an SMD marking code book with the answer. Does a 1N4007 seem about right for the circuit?https://www.onsemi.com/products/discretes-drivers/diodes-rectifiers/rectifiers/mra4007

author: JohnnyP
author_rank: Regular Contributor
timestamp: October 06, 2019, 06:25:17 am
content: Just looked it up on Mouser. I think you've got it.I used 800v S2K/KA from Diodes Inc thinking they would be better. Now I have to figure out why they didn't work.

author: JohnnyP
author_rank: Regular Contributor
timestamp: October 06, 2019, 06:30:20 am
content: Welp, wasn't the diodes. I think I know what's going on...
Identify FC2rJT step-down regulator SMD - Page 1
Forum section: electronics / projects

author: nunojpg
author_rank: Contributor
timestamp: April 09, 2019, 05:00:59 pm
content: I have a consumer TP-LINK Archer C20 router which comes with a 9V brick and I would like to check if I can feed it with unregulated voltages up to 15v.This is the regulator circuit. Input 9V and output 3.3V. Any luck getting the part number to check the voltage specs?

author: mariush
author_rank: Super Contributor
timestamp: April 09, 2019, 05:25:39 pm
content: Maybe it's this one.. pinout seems to match and datasheet mentions FC2 as marking :fitipower integrated technology lncFR8204https://datasheet.lcsc.com/szlcsc/Fitipower-Integrated-Tech-FR8204S6CTR_C172766.pdfLow RDS(ON)Integrated Power MOSFET(170mΩ/90mΩ)Internal Compensation FunctionWide Input Voltage Range: 4.5V to 18V0.8V Reference Voltage2AOutput Current500kHzSwitching Frequency1msSoft-StartTimeCycle-by-Cycle Current LimitOver-Temperature Protectionwith Auto RecoveryUnder Voltage LockoutHiccup Short Circuit ProtectionSOT-23-6 Package

author: nunojpg
author_rank: Contributor
timestamp: April 09, 2019, 05:36:44 pm
content: The reference voltage is 0.8V as on that datasheet. Looks good. Thanks!

author: amyk
author_rank: Super Contributor
timestamp: April 10, 2019, 01:34:14 am
content: A good way to confirm is to look at images from sellers of the part:https://detail.1688.com/offer/590026600855.html