hybridfree/eevblog-posts huggingface dataset:
Looking for single chip solar MPPT + LiPo charging - Page 1
Forum section: electronics / beginners

author: senso
author_rank: Frequent Contributor
timestamp: March 30, 2017, 12:04:14 am
content: Good evening, is there any single chip solution that will take the raw input from a solar panel in the 1-5Watts range(the ones I have preselected have typical voltages in the 4-5v range with maximum Vopen of 8-9v), for now I have found bq24650, but I have idea that Linear Tech had a couple chips that where designed for this.The battery size is not super critical, it will be tested in a board(a wireless datalogger) that uses 20mA at 3.3v during 200ms for each transmitted data packet and around 8mA during 100ms for the data acquisition.Thanks for your time, best regards.

author: Seekonk
author_rank: Super Contributor
timestamp: March 30, 2017, 05:24:35 pm
content: If that is the chip I am thinking of, it really isn't MPPT. They do temperature sensing to control the panel voltage. If you already have a micro in your system, you might as well roll your own. Sense the OC panel voltage and take 80% of that. Lipo charging is pretty simple.

author: senso
author_rank: Frequent Contributor
timestamp: March 30, 2017, 08:54:45 pm
content: There is a micro in there, maybe, I want to have a standalone pcb that I can add to the rest of the project(at least for now), so I can test it, and even if I end up with a micro in there it will be sleeping for hours, so it wont be able to nurse the MPPT, lipo charging IC's are cheap and TI as a lot of them, having a one chip solution would be neat, but its not the end of the world if I really need to use a couple IC's, but I would prefer to not end doing it with a micro, I dont trust my code lol.

author: DavidMenting
author_rank: Contributor
timestamp: March 31, 2017, 09:06:22 am
content: Is the LT3652 the chip you were looking for?Hooking up a 5/6V panel directly to a LiFePo4 and shutting it off once the voltage reaches 3.6V or so also works nicely.
Looking for socket for this particular connector - Page 1
Forum section: electronics / beginners

author: amateur_25
author_rank: Regular Contributor
timestamp: April 08, 2012, 02:12:42 pm
content: Sorry about the blurry picture. If you can't identify let me know I'll beg my sister to take picture with SLR. I'm looking for the socket for that connector. Since there are more connectors used in electronics than you can shake a stick at, I would like some assistance in identifiying this connector please.

author: wkb
author_rank: Super Contributor
timestamp: April 08, 2012, 02:19:54 pm
content: That is more than blurry, that is is useless picture if you want somebody to help you identify that connector.

author: ciccio
author_rank: Frequent Contributor
timestamp: April 08, 2012, 02:23:39 pm
content: It seems (not sure, there are many alternative) a 2 mm pitch connector made by JSThttp://www.jst.com/home21.html.Best regards

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 08, 2012, 03:44:39 pm
content: i measured it fullsize on my screen, its 15mm pitch, so sorry, cant help you there. but if its 2.54mm pitch, then you can diy the "dip female pin" easily available in ebay (china seller).

author: david77
author_rank: Frequent Contributor
timestamp: April 08, 2012, 04:46:01 pm
content: Take a good magnifying glass and look for manufacturers markings, they are very small but good brand manufacturers have at least the company name somwhere on their connectors.JST sounds about right, though.

author: amyk
author_rank: Super Contributor
timestamp: April 09, 2012, 08:17:49 am
content: I think that would be a JST PHhttp://www.jst-mfg.com/product/detail_e.php?series=199
Looking for Solar panel / electrical transmission engineers!   - Page 1
Forum section: electronics / beginners

author: nipplecripple
author_rank: Newbie
timestamp: March 11, 2014, 01:22:57 pm
content: Hi everyoneSo I'm doing a college assignment that asks: 'How a practical application of electrical technology could be improved by making effective use of available technologies'I have been going over some ideas of applying solar panels to transmission pylons.One of the points in the assignment is for evaluation by a third party/engineer in those industries.Can anyone point me toward someone/company or someone on the forum who is involved with pylons/solar panels?Many thanks in advance!

author: KDC
author_rank: Contributor
timestamp: March 13, 2014, 03:37:22 am
content: I'm involved with the power generation/transmission industry (at a lower level than an engineer however), and can think of a few issues with the concept that would need to be considered.That said however, you might find a R&D department at a local utility that you can inquire with. Failing finding something more local, you can always inquire with my local utility (http://hydro.mb.ca/corporate/research_and_development.shtml?WT.mc_id=2126). Worst they can say is "sorry, can't help you".
Looking for some help with a basic circuit - Page 1
Forum section: electronics / beginners

author: 8BitCPUFan
author_rank: Newbie
timestamp: March 17, 2024, 03:30:48 am
content: Hi everyone. Sorry for the newbie question.I want to build this circuit I found online, my hearing is not as good as it used to be and I'm not really concerned with audio quality since I am using cheap earbuds anyway. My laptop has a weak output and I have the parts around to make it.I don't know where to attach the power, though. The schematic indicates where ground should be, but not where VCC should be.Any assistance would be greatly appreciated.

author: IanB
author_rank: Super Contributor
timestamp: March 17, 2024, 03:54:42 am
content: The NE5532 IC has separate pins for power (V+ and V−). You will need a bipolar supply, e.g. two 9 V batteries in series. Check the data sheet for the particular IC you have, to identify which pins are which. For example:https://www.ti.com/document-viewer/ne5532/datasheet

author: soldar
author_rank: Super Contributor
timestamp: March 17, 2024, 06:34:46 am
content: How portable do you need it to be? You can buy a small amplifier board and power it with a wall wart or even with the laptop's USB and it will be simpler than building your own.Also, the desktop speakers I have right here, connected to my laptop, have an earphone socket as many do. You could buy similar speakers and use them both as loudspeakers and as earphone amplifier. Much simpler than building your own.
Looking for something to hold the soldering iron - Page 1
Forum section: electronics / beginners

author: Merlysys
author_rank: Regular Contributor
timestamp: February 07, 2014, 05:18:50 pm
content: When soldering my problem is 'shaky hands'. Is there a contraption that can hold a tool (in this case the soldering iron) while I position it. I think the mechanism in a drill press does this, the operator turns the handle to bring the chuck down, letting go of the handle eases the soldering iron. Even if its not made for a soldering iron I could modify it to hold an iron.

author: Simon
author_rank: Unknown
timestamp: February 07, 2014, 05:20:28 pm
content: you could get a press for a dremel (modelling drill) and try modifying that. You will need the iron on an angle though, it's really not going to be easy.

author: 8086
author_rank: Super Contributor
timestamp: February 07, 2014, 05:22:01 pm
content: Quote from: Simon on February 07, 2014, 05:20:28 pmI owned the dremel drill press for a while, and though it is useless for actually drilling, it does have a rotating head, so it is easy to put the soldering iron at an angle and apply downward to the solder joint.

author: Simon
author_rank: Unknown
timestamp: February 07, 2014, 05:24:57 pm
content: oh yes of course it does turn too so solved, just need to fix the iron to it.Yes they are not the best for drilling as they move to one side slightly when the drill bit hits the thing to drill but they are not too bad.
Looking for special crimp terminals - Page 1
Forum section: electronics / beginners

author: ArcadeTV
author_rank: Contributor
timestamp: January 04, 2015, 10:29:53 pm
content: I'm looking for a certain pin/terminal/crimp-contact thing...It's from a Nintendo AV-cable and it looks like this:The whole thing is 20 mm long, 2 mm width and the part which is bent is 6mm long.I tried googling any kind of molex, T.E., leaf amp dummy terminal or crimp contact for edge connectors but no luck at all.If anybody out there has a clue where to get these please let me know.Thanks guys!For reference, here's the housing where these pins were located:
looking for specific "inverted" SMD trim pot - Page 1
Forum section: electronics / beginners

author: rl4
author_rank: Newbie
timestamp: June 16, 2021, 10:46:32 pm
content: Hey guys,First time poster here and I really hope I am posting this in the correct subforum. I am looking for a certain type of SMD trim pot I came across on stepper drivers. The forum search function didnt spit out anything on this specific type or I dont know what to search for. It is circled red in the first picture, which is the bottom view of the stepper. However, the trim pot is actually adjusted from the top through the little hole I pointed to in the second picture. So basically it is an inverted SMD trim pot with the screw pointing towards the PCB. I looked around on Mouser and Aliexpress, but didnt come across anything like it. Could anyone please tell me what type it is and/ or where I can find some of these?Thank you so much!You can click on the pictures for a more zoomed in view.

author: ridon
author_rank: Newbie
timestamp: June 16, 2021, 11:15:13 pm
content: you could just route the trace backward

author: rl4
author_rank: Newbie
timestamp: June 16, 2021, 11:19:53 pm
content: No you misunderstood, I want to buy these trimmers for a project of my own and they are specifically designed with the adjustable screw pointing towards the PCB. I just cant find this type anywhere to buy or dont know what to look for.

author: rdl
author_rank: Super Contributor
timestamp: June 17, 2021, 12:37:06 am
content: I think the words you're looking for are "bottom adjust".

author: rl4
author_rank: Newbie
timestamp: June 17, 2021, 02:16:03 am
content: Thank you! That was the exact hint I needed! The type is called "Bourns TC33B" and is sadly no longer manufactured.

author: Jwillis
author_rank: Super Contributor
timestamp: June 17, 2021, 03:28:58 am
content: Quote from: rl4 on June 17, 2021, 02:16:03 amDigikey suggests this to substitute3314R-1-103E

author: ridon
author_rank: Newbie
timestamp: June 17, 2021, 04:07:08 pm
content: oops my bad
Looking for standard mosfet.  - Page 1
Forum section: electronics / beginners

author: myf
author_rank: Regular Contributor
timestamp: May 02, 2019, 07:55:24 pm
content: Hello,I like to play with npn and pnp transistors.I use the mid-power bd139 and bd140 in to220 box, the low-power bc337 and bc327, and Darlington bc516 and bc517.bd139 and bd140 are almost indestructible !I want to discover n-channel and p-channel mosfets but I don't know which I must choose.The datasheet I am looking for is about :less than 50V, less than 10A , about Rdson = 30 or 50 miliOhm, an actually "close switch" at less than Vgs = 4V even for a 10A load, and a to220 box.And I prefer to test cheap mosfet at about 3eur for 10pcs on aliexpress.com.I don't find any pair of n-channel and p-channel mosfets but there are bd139 and bd140.What do you think of these reference ?stp40nf10 type N 50A 100V 0.03ohm - 15A for 4V to-220 andstp80pf55 type P 80A 55V 0.02ohm - 60A sous 5V to-220.Maybe they are too big for my use ? Do you have better references to propose ?Do you know a pair of reference : same datasheet for p-channel and n-channel ?Might you confirm that no current inputs in the gate but the very very low capacity current.Have a nice day !F.

author: Jwillis
author_rank: Super Contributor
timestamp: May 02, 2019, 08:35:09 pm
content: I won't find to many matched n and p type mosfets like you would with BJTs .This is because MOSFETs are almost always used in switching applications and p type are simply not needed in that type of application..You can't use most MOSFETs or IGBT in a linear fashion the same way you would with a BJT .Mosfet are either fully on or off and a switching pulse at the gate is needed to control the source to drain.That of course is simplified.If you want a general purpose MOSFETs to experiment with may I suggest the IRL3705 or N0604N .Both N type are common, very cheap and have lots of projects using them.As for P type I think I have one in my supply because I simply don't have any use for P type FETS

author: David Hess
author_rank: Super Contributor
timestamp: May 03, 2019, 03:46:58 am
content: MOSFET complementary pairs differ much more than bipolar transistor complementary pairs because of a much greater difference in die size. A p-channel device has either about twice the die area and power dissipation or twice the resistance and half the current rating. So if you want a complementary MOSFET pair with equal dynamic characteristics, pick parts with the same voltage and power rating.I would give some examples but Microchip's selection guides and documentation links are broken.
Looking for sub C Li ion battery  - Page 1
Forum section: electronics / beginners

author: Jwillis
author_rank: Super Contributor
timestamp: September 10, 2021, 12:53:43 am
content: Friend of mine wants to convert his old NiCad battery packs to lithium ion for cordless tools . I've looked and came up with nothing . The closest is CR123 . 18650 won't fit the case with out a loss of mAh . Is their such a thing as Sub C lithium ion batteries ?

author: bdunham7
author_rank: Super Contributor
timestamp: September 10, 2021, 03:38:23 am
content: How long are the original sub-C cells? I believe there are 2/3 and 4/5 versions, perhaps 1/2 as well. I've never succeeded at changing these to Li-ion, but you can get some pretty good NiMH cells from Tenergy in 4/5 and full-C sizes. 4/5 is 43mm long. If you can get the right size, you can probably double the original capacity without major modifications.

author: sleemanj
author_rank: Super Contributor
timestamp: September 10, 2021, 04:47:53 am
content: I think by the time you source cells, build packs, including protection and charging circuitry etc then it's probably just as economic to either1. buy new tools; or2. hack on adapters for your pick of commonly available power tool battery packsFor 2, adapters are available, skip to 4 minutes in of this video for examples of such retrofitting...https://youtu.be/bHeii834ujs

author: tunk
author_rank: Super Contributor
timestamp: September 10, 2021, 11:07:34 am
content: If you find something suitable size-wise, remember that theyshould be able to deliver high currents, maybe 20-30A.

author: Jwillis
author_rank: Super Contributor
timestamp: September 10, 2021, 03:09:29 pm
content: I suggested the NiMh batteries as a replacement because he could use the same charger and they are really cheap compared to Lion batteries.There are Lion upgrades for the tools he has . But very expensive at as high as $100 a pack . To place the entire tool set is not really an option.Could call on the discharge rate . CR123 would be way to low for this application at 1.4A and 16340 are worse at 950mA . 5S 21700H might fit with out a loss and they're good for 25 Amp discharge .But all in all I would say rebuilding with NiMh would be the most economical approach .
looking for suggestion - Page 1
Forum section: electronics / beginners

author: xxngo
author_rank: Contributor
timestamp: April 03, 2015, 04:03:18 pm
content: Hello forum.....I'm looking for a function generator IC that will be able to generates, sine, quares and triangle waveforms with frequency range from 0-1MHZ.I was looking at the old ICL8038, but I believe that it discontinue. I was wondering if anyone can give me an advice on which IC I can use for my project...... I also looked at the XR2206, can I please get some review on it?Thank you

author: picandmix
author_rank: Frequent Contributor
timestamp: April 03, 2015, 04:58:53 pm
content: You might want to consider the AD9850 module with an Arduino Uno , both cheap on ebay .Its got the clear advantage that you can select, set and see the exact frequency value , rather than random dials of the XR2206Lots of other projects and reviews about it on the web, though you would have to add a little extra circuitry for a triangle wave.This project works okhttp://www.ad7c.com/projects/ad9850-dds-vfo/

author: Wilksey
author_rank: Super Contributor
timestamp: April 03, 2015, 11:46:37 pm
content: I'm pretty sure the XR2206 has been discontinued also?

author: xxngo
author_rank: Contributor
timestamp: April 04, 2015, 01:48:39 am
content: ah thank you very much picandmix, I will deffinately check out that link

author: mentaldemise
author_rank: Regular Contributor
timestamp: April 04, 2015, 06:55:05 am
content: What about something likehttp://www.ebay.com/itm/DDS-Function-Signal-Generator-Module-Sine-Square-Sawtooth-Triangle-Wave-DIY-KIT-/281542108582?pt=LH_DefaultDomain_0&hash=item418d37a5a6?
Looking for suitable wireless module - Page 1
Forum section: electronics / beginners

author: sairfan1
author_rank: Frequent Contributor
timestamp: February 23, 2024, 04:46:08 pm
content: In past few years lots of new wireless modules are introduced, I'm looking for some recomendations for my application where I want:1. battery operated low power2. tranmist short data, just temperature, humidity and battery status3. about 100meters bit noisy environment4. Many to one, about 6 to 20 nodes sending data to host, where host will send data to server with the help of MCU who is acting as middle layer between Wifi and wirelessNot considering LoRa, ESP, Zigbee

author: tooki
author_rank: Super Contributor
timestamp: February 23, 2024, 05:29:01 pm
content: Why exclude LoRa and Zigbee, which are intended for this type of application?!?

author: sairfan1
author_rank: Frequent Contributor
timestamp: February 23, 2024, 06:02:22 pm
content: Because I already know these tech, I'm looking for what else options are available.

author: selcuk
author_rank: Frequent Contributor
timestamp: February 23, 2024, 07:27:25 pm
content: BLE is an option.1. Very low power and runs well with battery.2. You can wake up the MCU when there is a need to measure and send data. This scenario is ok with temperature and humidity sensors.3. 100 meter is fine if there are no obstacles that can block 2.4GHz between the nodes.4. Peripheral devices may include a BLE MCU (nrf52 etc.), battery and sensors. Host is a BLE + wifi device (ESP32 etc.).

author: R_G_B_
author_rank: Frequent Contributor
timestamp: February 26, 2024, 02:08:24 pm
content: Look here:https://www.renesas.com/us/en/products/wireless-connectivity/wi-fi/low-power-wi-fi/da16200-ultra-low-power-wi-fi-soc-battery-powered-iot-devices

author: alligatorblues
author_rank: Regular Contributor
timestamp: February 26, 2024, 03:01:55 pm
content: You could use a laptop wifi card, and am I to understand this will be routed through a cullular carrier? The lappy card would be about right for power. The firmware is all done for you. It's about 3/4x5/8x1/16". It's probably the most common wifi device in the world with firmware writtten for almost everything. If you don't get FCC approval, the firmware is pretty liberally distributed, if you just ask for what you want.This is an interesting site:https://www.data-alliance.net/wireless-adapters-and-cards/
Looking for surface mount LED voltmeter/ammeter - Page 1
Forum section: electronics / beginners

author: LoveLaika
author_rank: Frequent Contributor
timestamp: June 02, 2020, 03:18:29 pm
content: I found this fun little panel meter on Digikey. It's cool, but it's panel mount. I could trim the cables and make a footprint with mounting holes on it, but I was wondering if you guys might know of any board/surface mount LED indicators for voltage and/or current? The ones I found on Digikey were expensive, and they weren't really what I needed. I'm trying to look for something like the ones used on this buck converter linked below.https://www.digikey.com/products/en?mpart=PRT-14313&v=1568https://www.digikey.com/product-detail/en/dfrobot/DFR0379/1738-1293-ND/7087190

author: Jwillis
author_rank: Super Contributor
timestamp: June 04, 2020, 01:57:57 am
content: I doubt there is such a thing as a volt/amp meter that is SMD . Since the meter display requires a driver that also functions as a sensor for voltage and or current.But there are SMD 7 segment displays.https://vcclite.com/wp-content/uploads/wpallimport/files/files/DSM7TA56106T.pdfI've not encountered anything with more than 3 characters . Depending on the driver used you could potentially place as many as you like on a board.

author: wizard69
author_rank: Super Contributor
timestamp: June 06, 2020, 02:59:11 am
content: You will likely need to shop around, I’d be very surprised if a surface mount module didn’t exist. Try different mAnufactures Murata, C-Ton and the like.

author: KingSolomon
author_rank: Contributor
timestamp: June 06, 2020, 05:42:00 am
content: Would these work? They are through hole rather than SMD.https://www.digikey.com/products/en/industrial-automation-and-controls/panel-meters/805?k=voltmeter&k=&pkeyword=voltmeter&sv=0&pv69=411897&sf=1&FV=-8%7C805&quantity=&ColumnSort=0&page=1&pageSize=25*Edit: It looks like those are discontinued.

author: LoveLaika
author_rank: Frequent Contributor
timestamp: June 08, 2020, 02:02:36 pm
content: Thanks for your reply. I was hoping that there would be a pre-made kit of sorts so I could avoid having all the circuitry on one board.

author: LoveLaika
author_rank: Frequent Contributor
timestamp: June 08, 2020, 02:05:22 pm
content: Thanks for helping, but yeah, being discontinued sucks.
Looking for the best tool to emulate old synthetizers inner circuits - Page 1
Forum section: electronics / beginners

author: Barbouze
author_rank: Newbie
timestamp: November 30, 2015, 05:48:16 pm
content: Hi!I hope I'm posting in the correct section of this forumI have some really basic knowledge of electronics and don't intend to build hardware pieces but I'm facing an interesting challenge.I usePure Datato create instruments and audio effects and while I'm no master at it, I'm getting more and more of an advanced user. Recently, I tried to emulate a famous synth of the 70ies, theARP Solina string ensemble. The key to emulate to its signature sound is to recreate its chorus unit and although I got something that seems pretty close, I'm lacking some parameters.I searched for those over audio forums and got some precisions (mainlyhere,hereandthere). I also found and interesting document, theservice information manual, that has all the schematics and PCB layout of this synth.I would like to emulate the control circuit and the first modulator circuit from the two LFO to the control oscillator (page 9 and 10) and get datas to process the parameters needed for my emulation like LFO waveform and frequency, control oscillator frequency, etc.I searched for such tools (called EDA) and tried some with mixed results (mainly Qucs). I only need something that runs on linux, allows me to recreate those schematics and run a simulation. Could you please give me advices on what would be the best tool to do this?
Looking for the cause of smoke - Page 1
Forum section: electronics / beginners

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 12:18:35 am
content: R73 of my "buster 2303" makes smoke when the range switch is set to 1A or more range (500mohm left side, 50mohm right side). Other ranges work fine for hours without any problem.When I first found out this, it was 98ohm, now after a few cook 43ohm.Looked simple but turned out many nights of coffeeWhere should I look?

author: Rerouter
author_rank: Super Contributor
timestamp: January 25, 2014, 12:28:56 am
content: Its acting as an inrush current limiter until the control part of the circuit is powered, complelty remove the relay from circuit and make sure it1. Energizes2. The contact resistance is low3. It can trigger off 7V with a 22 ohm resistor in series4. that that 22 ohm resistor measures correctly

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 03:25:29 am
content: I pulled out of the PCB and put on the breadboard like in the picture.Answer:1) Yes.2) 80mohm3) Yes4) 22ohm resistor on the board measured as 22.23ohmNow right 1A range doesn't work displaying random number but left side 1A range still accurate number and smoke.Thank you.

author: Rerouter
author_rank: Super Contributor
timestamp: January 25, 2014, 03:52:42 am
content: Ok next up is make sure the input to the 7805 is receiving a nice solid 7V or greater,(while you have that relay out may want to confirm what the lowest voltage it will trigger at is,

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 04:45:01 am
content: 1.65Volt can hold it. Could be actuated at 4.7V.I was going to replace the resistor but when I pulled out, it measured 102.45ohm. May I was measuring with transformer coil parallel.I will put it back all and check 7805.Thank you.

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 05:32:35 am
content: Yes, bridge rectifier before C12 has damaged. One diode is open both ways.Thank you very much.I always check the PS first no matter what but this time the machine seems work fine and as soon as I saw the smoke, my attention was fixed at the smellLesson learned.

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 06:36:59 am
content: Too quick. Real big problem.TR2 7V secondary coil is open:palm:

author: Rerouter
author_rank: Super Contributor
timestamp: January 25, 2014, 06:52:01 am
content: I dont suppose you have any rough estimate what current that 5V rail is meant to pull, as if only that secondary is blown and it is a low current winding you could likely bodge in some $5 230 to 7V Transformer,

author: nadona
author_rank: Regular Contributor
timestamp: January 25, 2014, 07:21:53 am
content: 230 to 7 OR 120 to 7?I was thinking this too.500mA?Would you select one from this page?http://www.digikey.com/product-search/en/transformers/power-transformers/786735

author: Rerouter
author_rank: Super Contributor
timestamp: January 25, 2014, 07:25:54 am
content: Ah American, so yes 120 to 7, if its 500mA a piddly little 5VA transformer would easily make up for it,
Looking for the right size capacitors - Page 1
Forum section: electronics / beginners

author: pyroesp
author_rank: Regular Contributor
timestamp: September 05, 2018, 01:29:04 pm
content: I've recently been looking at repairing a game boy where I've found a few of the electrolytic caps that have bulged. They haven't leaked yet, which is nice.The thing is I can't find the same size capacitors.Here's the list (w=width=diameter, h=height=length):Cpu:100u 10V x2 w6.5mm h5mm10u 16V x2 w4mm h7mm1u 50V x2Power:33u 25V x1 w6.5mm h5mm100u 10V x1 w6.5mm h5mm22u 10V x1 w4mm h5mmAudio:100u 6.3V x2 w4mm h6mmLcd:100u 10V x2 w6.5mm h6.5mm10u 25V x1 w4mm h6.5mm1u 10V x5 w3mm h5mmI've measured the body of the caps with calipers.I've opened 3 of my game boys and 2 of them are Panasonic brands and the 3rd one is Sanyo, yet I can't find the right one on digikey nor in the sub miniature elcos category on reichelt.All I've found so far are 5x7mm (WxL).Does anyone know where I could find these ?

author: Zero999
author_rank: Super Contributor
timestamp: September 05, 2018, 01:38:21 pm
content: What's the lead pitch? How about using smaller diameter capacitors and bending the leads?How much clear space is available above the PCB? Could slightly taller capacitors be fitted?The voltage rating isn't important, as long as it's equal or higher, than what it replaces.

author: pyroesp
author_rank: Regular Contributor
timestamp: September 05, 2018, 01:48:57 pm
content: The lead pitch is 0.5mm. The 100u caps have to be straight, but it looks like I have enough space for a taller one like the 5x7mm I found.I would prefer to have original looking caps though, but if I can't find them then I'll have to get those ones.

author: 6PTsocket
author_rank: Regular Contributor
timestamp: September 07, 2018, 05:28:31 am
content: Function first. If you get an electrical match and the parts can be mounted securely that should be you concern. I would also pay attention to any special requirements like low ESR. The inside of a box is not for show.Quote from: pyroesp on September 05, 2018, 01:48:57 pmSent from my SM-G900V using Tapatalk

author: stmdude
author_rank: Frequent Contributor
timestamp: September 07, 2018, 06:56:30 am
content: Any reason a ready-made capacitor-kit for the DMG Gameboy won't work?https://console5.com/store/game-boy-dmg-01-cap-kit.htmlIt's easier and cheaper than sourcing the individual caps yourself.

author: tooki
author_rank: Super Contributor
timestamp: September 07, 2018, 09:18:12 am
content: Quote from: pyroesp on September 05, 2018, 01:48:57 pmI'm certain it is not, because the lead pitch can't be equal to or less than the thickness of the leads. (Pitch is the distance between centers of the leads.)
Looking for the right transistor. - Page 1
Forum section: electronics / beginners

author: BrokenTrace
author_rank: Newbie
timestamp: October 05, 2014, 12:13:59 am
content: Im making a PCB with only smd components. I want to turn on/off a complex circuit of the board with a phisical switch. This circuit needs 600mA, but lets say 1A to be sure, and it is conected to a 16v.I would like to use the less components possible, but I cannot use only a switch slider to do that, because small ones cannot carry 1A. I will use probably this one, or one similar (1p2t horizontal switch):http://www.ebay.com/itm/10-Pcs-x-On-On-2-Position-1P2T-SPDT-Miniature-Horizontal-Slide-Switch-SMD-7-Pin-/310569921527So I have to use a transistor, like this:I belive that is ok. But, what smd transistor could I use? Can you help me to choose one?The first problem is that the transistor base is going to be 16v, too much? I cannot regulate that voltage.Second, the transistor should handle 1A (size problem?)Third, what could be the value for that resistor? I dont care, I can put any value. The switch can use up to 0.3A, but maybe 20mA is ok for the gate, or what it the perfect value for that? (I cannot see that on datasheets :/)Im looking for tons of datasheets, but I cannot pick the right one, Im very newbie and also I dont want to ruine the pdb just for this. So could you help me?Thanks!!

author: Paul Price
author_rank: Super Contributor
timestamp: October 05, 2014, 12:52:56 am
content: What you need is a P-Chan power MOSFET to do the switching job.ADVANCED POWER ELECTRONICS CORP-AP4435GH-HF-3TR-MOSFET, PCH, -30V, 20MOHM, TO-252You can get the MOSFET above from Farnell/Element 14/Newark etc.

author: sleemanj
author_rank: Super Contributor
timestamp: October 05, 2014, 01:55:44 am
content: I would use either a P-channel on the high (positive) side, or an N-channel on the low (negative) side of the load.P Channel: AP2305AGN/AP2305GN will handle 3A and 20v across it.N Channel: SI2302DS will handle 2A and 20v across it.If you want to use a transistor, PNP - SS8550LT1, NPN - SS0850LT1. Either can handle about 1500mA max with 200-300mW dissipation.Whichever way you go, remember to pull the gate/base high or low when OFF as appropriate, don't leave it floating.
looking for this MOSFET - Page 1
Forum section: electronics / beginners

author: om
author_rank: Newbie
timestamp: March 07, 2020, 07:14:01 am
content: Hi!I'm looking for this MOSFET printed "E6 GUE 3Q0604".This is used at TOSHIBA laptop PC "TB87/NG"A similar one would also be fine.Thanks in advance.

author: om
author_rank: Newbie
timestamp: March 07, 2020, 07:35:29 am
content: Thanks for your quick response.When power on, this mosfet is very hot , so I think it doesn't work.I will short it.

author: flolic
author_rank: Frequent Contributor
timestamp: March 07, 2020, 08:39:53 am
content: What is motherboard part number and revision? It is printed somewhere on the motherboard.From my experience, when one of those mosfets from the power supply input is hot, you have either shorted mosfet or shorted bypass MLCC capacitor from +B to GND somewhere on the board.Thermal camera can find those in a second.

author: om
author_rank: Newbie
timestamp: March 07, 2020, 10:00:42 am
content: Motherboard part number is "V000358240" REV 2.01 J4124 CQ.

author: flolic
author_rank: Frequent Contributor
timestamp: March 09, 2020, 02:49:29 pm
content: Unfortunately, schematic is unavailable for that motherboard.If problem is with that mosfet (not likely), you can replace it with similar N-channel low RDS(on) 30V device like AON7440, AON7408...
looking for thyristor - Page 1
Forum section: electronics / beginners

author: LaserTazerPhaser
author_rank: Regular Contributor
timestamp: May 02, 2019, 11:47:59 pm
content: found a decent product on ebay but is Ruttonsha International Rectifier any good of a brand to go with?

author: Zero999
author_rank: Super Contributor
timestamp: May 03, 2019, 10:14:41 am
content: You haven't provided enough information. What voltage, current, package etc. do you require?

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: May 03, 2019, 10:44:23 am
content: Check if they can provide samples for you're desired part but as mentioned before, be more specific for datasheet comparisson.

author: Jwillis
author_rank: Super Contributor
timestamp: May 03, 2019, 12:27:09 pm
content: Ruttonsha International Rectifier (Headquartered in India) is in "technical collaboration with International Rectifier Corp., USA, for manufacturing of Power Semiconductors". Apparently for the last 25 years . I imagine there are standards they have to uphold to.

author: perieanuo
author_rank: Frequent Contributor
timestamp: May 03, 2019, 03:43:04 pm
content: What colour?Joking, put specs then we talkEnvoyé de mon iPad en utilisant Tapatalk
Looking for TM16xx or any related driver for dotmatrix display - Page 1
Forum section: electronics / beginners

author: sairfan1
author_rank: Frequent Contributor
timestamp: August 18, 2025, 08:07:49 pm
content: I'm looking for if someone can recommend me which TM16xx driver can be used for 8x8x8 matrix display where i want to casecade upto 4 unitsI know MAX721 is a general choice but its too expensive looking for some Chinese alternate.

author: edavid
author_rank: Super Contributor
timestamp: August 18, 2025, 08:27:58 pm
content: LCSC sells several brands of MAX7219 clones at reasonable prices, e.g. HX7219CDWRG:https://www.lcsc.com/product-detail/C5145464.html
Looking for verification on my solution of this series LC circuit analysis - Page 1
Forum section: electronics / beginners

author: Mattjd
author_rank: Regular Contributor
timestamp: February 17, 2019, 07:35:24 pm
content: https://imgur.com/a/yCLXwObSo above is the question, plus my solution and at the end two snippets from the text book which I believe gives wrong general forms. I really don't care about knowing if the book made a mistake or not but that my analysis of the circuit for determining the capacitor voltage was correct. This is for a power electronics elective.Using the equations from the book, I getwd = 14586, alpha = 0A1 = initial current through inductor = 0SoVc(t) = 120 - 0.1mH*1(82.27*14586-0)*cos(14586*t) = 120-119.99*cos(14586*t)

author: Mattjd
author_rank: Regular Contributor
timestamp: February 17, 2019, 08:31:02 pm
content: I added my calculations for the current, and the answer I got was the same as using the equations from the text book so maybe I fudged my voltage calculations? I'm not seeing where though.

author: Mattjd
author_rank: Regular Contributor
timestamp: February 17, 2019, 08:43:24 pm
content: I found my issue and uploaded it, sorry
Looking for "voltage <=> current converter" equipment  - Page 1
Forum section: electronics / beginners

author: huu_tri0101
author_rank: Contributor
timestamp: May 25, 2018, 03:59:20 am
content: I'm looking for Laboratory equipment able to convert:Voltage to current:Scale:1V -> 1mA1V -> 2mA1V -> 3mA1V -> 4mA1V -> 5mA1V -> 10mAVoltage to Voltage1V -> 1VOutput power: <5WFrequency: 10Hz to 20kHzThank you for your suggestions.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 25, 2018, 04:30:36 am
content: 1). 1k resistor.2). 2 1k resistors parralel.3). 3 1k resistors parallel.4). 4 1k resistors parallel.5). 5 1k resistors parallel.6). 100 Ohm resistor.7). Piece of wire.

author: exe
author_rank: Unknown
timestamp: May 25, 2018, 02:49:49 pm
content: Google "Howland current pump" (supply side current source) or "current sink" (ground side). I'd suggest the second one if it is possible as howland pump requires matched resistors for good impedance.
looking for waterproof barrel jack connector - Page 1
Forum section: electronics / beginners

author: V_King
author_rank: Regular Contributor
timestamp: November 23, 2014, 11:13:40 pm
content: Hello,I wonder if anybody could help me to find in UK waterproof barrel jack connectors as shown below.more info herehttp://www.diytrade.com/china/pd/9807813/dc_plug_connector_waterproof_cable_3_5_dc_connector.htmlit would be great to find something with good wire and at least 5A rating at 12VDC.There some connectors in farnell and ebay with screw type seal, but I just need one, which clips together.China suppliers are not an option, as I need them for next weekCheers

author: Tandy
author_rank: Frequent Contributor
timestamp: November 24, 2014, 12:24:47 am
content: Those are moulded connectors where the wire has been soldered to the terminals and then the housing injection moulded onto the cable. Barrel connectors that you can put on yourself won't be watertight. There seems little point having the cable entry waterproof when the connector itself has no way of being protected from water.

author: sparx
author_rank: Contributor
timestamp: November 24, 2014, 02:01:28 am
content: Would something like this suffice? Fairly cheap, and UK shipped.Electrical Waterproof Connector 1 2 3 4 5 6 Pin Way Superseal Car Boat Kit Clip

author: Zero999
author_rank: Super Contributor
timestamp: November 24, 2014, 10:42:07 am
content: How waterproof does it need to be?Does it just need to be protected against cleaning or is it going to be submersed in several meters for days?What IP rating do you need?

author: tggzzz
author_rank: Super Contributor
timestamp: November 24, 2014, 10:49:42 am
content: If you look up the "IP" waterproof ratings and define what you need, it will be easy to search distributors' catalogues for an appropriate IP** connector.You may need to take care with that cable, since a figure-of-eight cross-section might be a problem w.r.t getting a good seal.

author: corrado33
author_rank: Frequent Contributor
timestamp: November 24, 2014, 05:10:17 pm
content: batteryspace has some lockable "waterproof" barrel connectors similar to the ones you posted above. I have the same type (different company) on my bike light and it works well. I googled it, they do ship to the UK, although they're based in the US.http://www.batteryspace.com/trail-techcoaxislockableplugwithcable.aspx

author: V_King
author_rank: Regular Contributor
timestamp: November 24, 2014, 10:35:20 pm
content: Thanks for the answers. The wiring will be outdoors, so it is basically has to be splash proof. No submersion will be performed. An usually such connectors do come already with wiring or rubber sealing on the cable entry point.when you start putting in IP ratings in the catalog like farnell, you get the screw together ones, but I need to be able to quickly disconnect them quite often.
Looking for wired+wireless mesh network - Page 1
Forum section: electronics / beginners

author: SimonST
author_rank: Newbie
timestamp: October 10, 2018, 06:10:42 pm
content: Hi All!Trying to expand a project, and looking for how to do communication...I would like to use a both wires and wireless links to connect many Slaves to a Master for a project. I was thinking about 802.15.4, Zigbee or similar, but that is wireless only. I would like to be able to connect slaves with wires when possible and use wireless hops when not possible. Does anyone know of some existing solution/communication protocol that does this. I would like it to not require any user interaction to change between wire and wireless, I would like it to mesh over whatever exists.Aiming for cables max length of 1000m (thinking RS485 style) and wireless hops of max 1000-3000m. Low speed requirements. About max 50 kbits/s.Any ideas?

author: german77
author_rank: Regular Contributor
timestamp: October 10, 2018, 07:00:46 pm
content: Take a look on CAN bus. They are used on PLC in industries and cars to read from many sensors and control many actuators in a master slave configuration.Switching between wireless and wired transparently I can only think of Ethernet 802.3 with is the way Internet it's connected.

author: SimonST
author_rank: Newbie
timestamp: October 13, 2018, 08:32:31 am
content: Thanks, I have been considering CAN for the wired bus but any mesh solution would be more nice.
Looking information on YM7108 ic - Page 1
Forum section: electronics / beginners

author: Frazatto
author_rank: Contributor
timestamp: August 21, 2020, 02:37:28 pm
content: Hello o/I'm looking information on an IC number YM7108, all I know it is an old Yamaha sound processing IC.I found it in an Yamaha PSS-20 keyboard that I'm starting to study to convert as a MIDI Controller.The idea is to keep all the original function working and use a switch to an arduino working as a the controller interface.The IC doesn't have as many pins as there are keys to press, so the keys must be getting multiplexed somehow and I wander if the IC is outputting it as a digital signal that I can read with the arduino, avoiding all the trouble to make an entire parallel circuit to hijack the keys.The only other digital component in the board is an audio amplifier.Any help will be appreciated, thanks.

author: Frazatto
author_rank: Contributor
timestamp: August 25, 2020, 02:20:14 pm
content: Ok! I was able to map most of it, so I will document it here for future reference.I only have a cheap ass multimeter, so I can't check the out signal processing pins.Check the attached table to see a binary map on how the keys are cycled and read by the IC.Going anti-clockwise from the pin marked with a dot, on the YM7108 ic, we have 18 pins where:0 - VCC (it expects constant 5V)1 to 6 - 5V (cycle power the keys)7 to 12 - 0V (listen for key presses)13 - Clock? (according to this projecthttps://seaweedfactory.blogspot.com/p/yamaha-pss.html)16 - ground14, 15 and 17 - goes to the amplifierI named the PSS-20 keyboard keys left to right, from function keys to high C:stopbluegreen0 to 31 (low F to high C)
Looking: Schamatic Audio amplyfier - Page 1
Forum section: electronics / beginners

author: MrZwing
author_rank: Regular Contributor
timestamp: January 03, 2015, 07:26:12 pm
content: Hello!I'm looking for a schematic for a simple stereo amplifier about 100w + 100w preferably so i can change Gain,Base,Balance well and Volume ofc.though that it would be a nice starter project and something i have use of since i need something so i can play music from my computer while i tear down my old LP player to see what makes it tick and build my own. and well i'm asking here since i have no idea where to look./MrZ

author: Richard Crowley
author_rank: Super Contributor
timestamp: January 03, 2015, 08:13:51 pm
content: http://sound.westhost.com/projects-0.htm#pwr

author: MrZwing
author_rank: Regular Contributor
timestamp: January 04, 2015, 11:16:19 am
content: Hmm ill look through it ans see if i can fins a project that could be done by a amateur like me haha.
Looking to build a Laser Driver! What IC to use? (Buck Design) - Page 1
Forum section: electronics / beginners

author: jimdt7
author_rank: Contributor
timestamp: April 09, 2014, 09:38:18 pm
content: Hello EEVBLOGers,I am a laser enthusiast (you can find me on LaserPointerForums.com, same username) and I'm in the process of designing my own Laser driver thus I would like some help, since I haven't found a suitable IC for my needs YET! That's why I came here! Here are the characteristics I am looking for:Vin: 2x (or more, max 4) 3.7V Li-ion BatteriesVout: 3-7V (depending on the Vf of the Laser Diode)Iout: 0.2A-3A (more or less is fine)I would like only SMD parts because I am trying to make this as small as possible!Thanks in advance and have a nice day,Jim

author: jimdt7
author_rank: Contributor
timestamp: April 10, 2014, 07:14:31 pm
content: BUMP!No ideas? :/Jim

author: AndyC_772
author_rank: Super Contributor
timestamp: April 10, 2014, 07:28:12 pm
content: The simplest way to get an 'off the shelf' design is probably to head over to ti.com and use their Webench tool. You can feed in your input and output requirements, pick a controller from the range of devices that can potentially meet your needs, and it'll design a circuit for you.

author: jimdt7
author_rank: Contributor
timestamp: April 10, 2014, 07:58:12 pm
content: Thank you very much for the reply! I've used their tool in the past, but I hoped for more ideas from you guys! :/I've located the TPS54335 chip but I don't think it is the best option for my needs...Thanks again,Jim

author: Marco
author_rank: Super Contributor
timestamp: April 10, 2014, 08:50:25 pm
content: What you want is a LED driver (some normal DC DC converters can bebodgedto create current sources, but why bother?).

author: jimdt7
author_rank: Contributor
timestamp: April 30, 2014, 02:41:26 pm
content: First of all thank you very much for the replies! After a big search I think I've finally found what I needed but Digikey doesn't have the part in stock.This is the part:http://www.allegromicro.com/en/Products/Regulators-And-Lighting/LED-Drivers-For-Lighting/A6211.aspxAny opinions? Where else can I get it from? (Digikey Alternatives)Thanks again and have a nice day,Jim

author: jlmoon
author_rank: Unknown
timestamp: April 30, 2014, 08:34:57 pm
content: Hello Jim,Not sure but you might be able to fit a Microchip MCP series into your design they are Boost (Not Buck) style converters with constant current, just not sure they have a part good for such a wide input V range with >1A range. I think you might have to consider a Buck/Boost configuration to accommodate that wide input voltage range keeping your laser current constant.probably more appropriate for your application would be to look around the Linear Tech series such as a LT3755-2 driver.. used in high power led situations this part can drive your LED in Boost, Buck Mode, Buck-Boost, SEPIC or Flyback Mode.JLM
Looking to contact Wuerstchenhund - anyone able to pass a message?  - Page 1
Forum section: electronics / beginners

author: py-bb
author_rank: Regular Contributor
timestamp: January 13, 2023, 09:19:32 pm
content: Hi there,I've just tried allaboutcircuits but there's no recent activity there. Does anyone have an email for the guy they can slip me? He was/is a wealth of information on LeCroy scopes and I can also answer some questions he's posed. There's no appropriate forum for this. I've been trying for a few weeks now. That allaboutcircuits is all I've found.Thanks.

author: py-bb
author_rank: Regular Contributor
timestamp: February 22, 2023, 03:32:05 am
content: I hate to do this but "bump" - I've tried messaging the guy, nothing. Cheers.

author: py-bb
author_rank: Regular Contributor
timestamp: April 03, 2023, 03:06:56 am
content: Another bump sorry, I've messed the guy, maybe a moderator can send an email?Thanks.

author: tautech
author_rank: Super Contributor
timestamp: April 03, 2023, 07:28:39 am
content: I'm thinking your best bet would be to post your exact issues in this thread:https://www.eevblog.com/forum/testgear/lets-talk-about-lecroy-scopes-aka-the-wuerstchenhund-holds-court-thread/

author: py-bb
author_rank: Regular Contributor
timestamp: April 03, 2023, 09:30:29 am
content: Oh I don't have an issue, I have the answers to some of his questions!