hybridfree/eevblog-posts huggingface dataset:
Will this charge 4 x NiMH cells in series? - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: March 21, 2025, 07:59:11 am
content: I run an AM radio when travelling remotely and don't want to use Alkaline batteries, I also don't want to have a step up / down SMPS running as the noise finds its way into quiet radio station audio. If the signal is weak I can run the radio off the 4 x 1.2V NiMH batteries, if the signal is good I can plug the USB charger lead into my a USB outlet supplied by my 12V house battery. The radio normally runs off 4x1.5V alkalines but is ok down to about 4.5V.Will this charger work to charge the 4 x 1.2V NiMH batteries in series.?https://www.ebay.com.au/itm/125105854734I'm probably using these batteries from Ikea in a series battery holder.https://www.ikea.com/au/en/p/ladda-rechargeable-battery-hr06-aa-1-2v-50504692/Thanks

author: BradC
author_rank: Super Contributor
timestamp: March 21, 2025, 09:21:23 am
content: Yes, We have a 7.2v model for my sons R/C car. Must have a little boost converter in there, and does a great job at delta/v end of charge detection.

author: Mahagam
author_rank: Regular Contributor
timestamp: March 21, 2025, 10:32:41 am
content: But, let say, after 10 charges with this device, charge batteries at least once with normal charger. This will balance batteries.

author: DTJ
author_rank: Super Contributor
timestamp: March 21, 2025, 11:44:05 am
content: Quote from: Mahagam on March 21, 2025, 10:32:41 amVery good point - Cheers.

author: DTJ
author_rank: Super Contributor
timestamp: March 21, 2025, 11:49:56 am
content: Quote from: BradC on March 21, 2025, 09:21:23 amGreat - I'll order one. Thanks.
Will this circuit work - Page 1
Forum section: electronics / projects

author: connectTek
author_rank: Regular Contributor
timestamp: May 03, 2020, 12:31:18 pm
content: I need to switch a 24vdc LED strip at 1amp.The switch is a Reed switch, I can only find a Reed that is off when no magnet is near, therefore I have the MosFet on when magnet is away,( door open).Would any problems arise from this CCT?.I have tested it on work bench and very rarely the MosFet is left very slightly on, drawing approx 50ma, this happens very rarely, if some one can help me understand why it would be much appreciated.Cheers

author: Zero999
author_rank: Super Contributor
timestamp: May 03, 2020, 12:46:50 pm
content: Yes, that circuit should work.The only things I can think of which would cause the MOSFET to be slightly on, when the switch is closed, are:A loose connection to the switch.The contacts not making due to oxide deposits on the contacts, not being broken due to the low current.Check the connections to the switch, if they're good, then it's #2. Some switches require a certain wetting current to work. Try adding a 100nF capacitor in parallel with R1, to provide a current spike to the switch contacts. I do think it's more likely to be #1 because most reed relays are hermetically sealed and filled with an inert gas, so oxidation shouldn't be a problem.

author: connectTek
author_rank: Regular Contributor
timestamp: May 03, 2020, 01:01:37 pm
content: Cheers and thanks for reply
Will this LM317 circuit work? - Page 1
Forum section: electronics / projects

author: illusive
author_rank: Regular Contributor
timestamp: February 18, 2016, 06:21:34 pm
content: Hi,I'm trying to design a LM317 power supply that will go down to 0 volts. I will need some voltage (1.25V or more) below the ground level to pull down the output to 0 volts. I took a simple approach by powering up another positive voltage regulator and connecting it's output to the ground of the main power supply so the ground of that new voltage regulator will be the "negative" voltage in reference to the "main" ground. I put a small 100ohm pot to adjust the minimum output voltage, otherwise it can go negative. The i added a NPN transistor across the adjust potentiometer. This is so i can have some kind of current control, i.e. when a certain current limit is reached the transistor will turn on and will short out the adjust pot, thus pulling the output to ground. Is there any major problem with the circuit?

author: Audioguru
author_rank: Super Contributor
timestamp: February 18, 2016, 07:28:50 pm
content: Your +3V regulator will not work because it is designed to source 3V but not to sink 3V. Use a negative voltage regulator instead.Your circuit has nothing to sense how much is the load current so what will the micro-c and transistor do?

author: Zero999
author_rank: Super Contributor
timestamp: February 18, 2016, 07:49:13 pm
content: Look at the internal schematic for a positive regulator and you'll see it has an emitter follower in the output so can only source current. You need a negative regulator, such as the LM337 to sink current.

author: illusive
author_rank: Regular Contributor
timestamp: February 18, 2016, 10:23:13 pm
content: I have simulated the circuit and i was able to get it down to 0v output. Isn't current flowing the way i have it drawn it?

author: Zero999
author_rank: Super Contributor
timestamp: February 18, 2016, 11:00:45 pm
content: That's different to your previous schematic. In order for it to work, V2 needs to be completely isolated from V1.

author: illusive
author_rank: Regular Contributor
timestamp: February 18, 2016, 11:10:40 pm
content: I have not included the transistor compared to the hand-drawn schematic but in both the 5V supply for the secondary regulator is coming from a separate transformer.

author: illusive
author_rank: Regular Contributor
timestamp: February 19, 2016, 03:28:42 pm
content: I have found this circuit in this forum and i think i will try it, because it will save me the need for a separate power supply. I think D5 is facing the wrong direction though.
Will this range switch circuit work correctly? - Page 1
Forum section: electronics / projects

author: teslinius
author_rank: Regular Contributor
timestamp: August 24, 2021, 10:15:59 pm
content: I made a circuit that will switch between the 2 resistor dividers for more precise voltage measurement, at first i used 2 n channel mosfets and 2 gpio pins but now i though up of this circuit to save a gpio pin, will it work correctly?, when gpio is high the top resistor divider will pass and the bottom one when gpio is low.

author: teslinius
author_rank: Regular Contributor
timestamp: August 24, 2021, 10:25:10 pm
content: Oh and also should the ALERT/RDY pin be pulled high or low, because in the datasheet it doesn't say?

author: Benta
author_rank: Super Contributor
timestamp: August 24, 2021, 10:33:28 pm
content: Just a suggestion:https://www.vishay.com/docs/76471/dg2001e.pdfPlenty of analog switches around. That might not be the right one, but...

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 24, 2021, 11:47:18 pm
content: Nope. Probably won't work.Watch those body diodes of the Fets.A high voltage on R36 will conduct through to U20 even if Q7 is off, and Q12 will also conduct it to the R39 & R38 voltage divider.You can put two MosFet's in "anti series" by connecting both gates and sources together, but that will still need extra attention to drive it with a proper gate voltage.So your alternatives are good old fashioned reed relays, analog switch IC's or "photomos" relays.But also:Such circuits are both easy to simulate and to build on a breadboard. So build some circuits and measure them to get some more hands-on experience.

author: gcewing
author_rank: Regular Contributor
timestamp: August 25, 2021, 12:53:36 am
content: Even if you solve the body diode problem, you will still have to be careful that you have enough gate-to-source voltage to turn the fets fullty on under all conditions.I second the recommendation to use some kind of analog switch or multiplexer chip, it will take care of all this for you.
Will this solar charge controller work with 18650s and a 10 watt solar panel?  - Page 1
Forum section: electronics / projects

author: Dmeads
author_rank: Regular Contributor
timestamp: October 23, 2019, 03:20:42 pm
content: Building a solar charger. I have an 18V operating voltage 10 watt solar panel and i want to know if i can use it with this charger:https://www.amazon.com/Controller-Lithium-Battery-Backlight-Display/dp/B07VB32S9H/ref=asc_df_B07VB32S9H/?tag=hyprod-20&linkCode=df0&hvadid=385267925262&hvpos=1o10&hvnetw=g&hvrand=7012525186986548405&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033109&hvtargid=aud-829758849484:pla-825014628908&psc=1&tag=&ref=&adgrpid=77670916479&hvpone=&hvptwo=&hvadid=385267925262&hvpos=1o10&hvnetw=g&hvrand=7012525186986548405&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033109&hvtargid=aud-829758849484:pla-825014628908I want to charge a 7s4p lipo battery pack. I dont care if it charges slow i just want to know if it can do it?thanks!
overcomplicated wiring for guitar! - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: October 10, 2019, 03:06:16 pm
content: I am trying to make a circuit for a guitar that would be able to get every possible sound out of 3 "humbucker" pickups. it uses 3 4 pole 6-way rotary switches 3 volume controls that and tone control that is meant to be switchable from high pass to low pass. the tone control really seems that it would be a problem and hard to make it work and also would mixing a p90 pickup whit a humbucker work?here is the public schematic for it:https://easyeda.com/evalc2636/all-config-pickups

author: 001
author_rank: Super Contributor
timestamp: October 10, 2019, 03:57:15 pm
content: Quote from: ELS122 on October 10, 2019, 03:06:16 pmOh boyAll guitar guys I hear for last 40yrs were equipped with stock or duncan humbuckers since all additional wirings kills sound ( signal/hum ratio is bad).

author: Benta
author_rank: Super Contributor
timestamp: October 10, 2019, 04:47:27 pm
content: With all those switches, you won't have time to play the guitar.Personally, I found the Stratocaster switch brilliant (in both senses).

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 10, 2019, 07:04:32 pm
content: Why not, Brian May had guitars with many switches, so you're not first.(He even has a shop now, so you can take a look:https://shop.brianmayguitars.co.uk/)

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 15, 2019, 03:11:29 pm
content: Use stacked pots.

author: Bassman59
author_rank: Super Contributor
timestamp: October 15, 2019, 05:25:35 pm
content: Quote from: ELS122 on October 15, 2019, 04:00:00 pmStewart-MacDonald has aselection of push-pull (and other) pots.Probably pricier than Amazon but they offer excellent customer service.

author: Bassman59
author_rank: Super Contributor
timestamp: October 16, 2019, 05:02:42 pm
content: Quote from: ELS122 on October 16, 2019, 04:21:31 pmWhat are you trying to achieve, exactly? I find I just leave my tone controls wide open (no roll-off) and I switch to the neck pickup for a darker sound.
will this work? - Page 1
Forum section: electronics / projects

author: p.larner
author_rank: Frequent Contributor
timestamp: April 06, 2024, 07:59:11 am
content: I ordered 2 transfos from aliexpress 230v pri sec 12-0-12v,ie 12 volt center tapped secondarys ,they sent ones with 12v secondaries with no center tap,so its a nogo sending them back,so can i wire there both primaries in series,then link the secondaries,using the link as a center tap,for +12/-12v,hope it makes sense,its only a load for swithching relays in a psu kit.

author: moffy
author_rank: Super Contributor
timestamp: April 06, 2024, 08:42:01 am
content: Wouldn't you want the primaries in parallel otherwise if in series the secondaries will become 6V RMS windings? If you wire them with the primaries in parallel and link one terminal of a 12V RMS winding to one terminal of the other, phasing might be important, just make sure you have 24V RMS across both windings when they are connected.

author: Andy Chee
author_rank: Super Contributor
timestamp: April 06, 2024, 09:44:39 am
content: It’s possible to use a voltage doubler configuration to obtain +/-12V dual rails from a single 12VAC winding.But if you’re only powering relays, that normally doesn’t require dual rail supply.Can you post a schematic?

author: Gyro
author_rank: Super Contributor
timestamp: April 06, 2024, 09:55:09 am
content: Quote from: p.larner on April 06, 2024, 07:59:11 amYou description is not at all clear. If you order 12-0-12V secondaries, then you shouldn't expect to receive center tapped 12V ones (6-0-6V).Please post a clear diagram of what you want, labeling all voltages, together with clear photos of the transformer, including labels.

author: tooki
author_rank: Super Contributor
timestamp: April 06, 2024, 11:24:20 am
content: Quote from: p.larner on April 06, 2024, 07:59:11 am12-0-12 is a center-tapped 24V transformer.

author: p.larner
author_rank: Frequent Contributor
timestamp: April 07, 2024, 09:07:31 am
content: The transformer is the aux one in the schematic attatched,the orig is slightly wrong but it makes the point,basicaly i have a bunch of 12v secondary transfos that i need to use for the aux transfo in the psy schematic.,sending these back to china is a no brainer!.

author: DavidAlfa
author_rank: Super Contributor
timestamp: April 07, 2024, 09:36:51 am
content: Connecting the primaries in series will lead to 6V+6V instead your intended 12+12.Primaries must go in parallel, secondaries in series, emulating the center tap.Just like this:
Wind and PV charge controller project, best way to skin it? - Page 1
Forum section: electronics / projects

author: bob_volts
author_rank: Newbie
timestamp: February 19, 2020, 12:31:50 pm
content: Afternoon AllI'm currently in the planning process of designing a PV and wind source battery charger. Its a low input power concept, the PV is 40-50w and the wind will be via an alternator capped at 10 amps all charging a 12v battery . First ever "project", in experience would it be best to build individual PWM controllers for both sources and take them both to the battery?Any help would be appreciated.Bob.
Wind mill controller reverse engineering - Page 1
Forum section: electronics / projects

author: somlioy
author_rank: Regular Contributor
timestamp: May 27, 2016, 03:25:08 pm
content: HelloI got a wind mill controller that was fried somehow and the model is out of production so I thought it'd be a great exercise to create a new one. I've traced out the power circuits but I'm not quite sure whats going on. I'd be greatful if someone can explain. What I dont get is how the negative is created.The stator has three phases. Wind mill output is supposed to be 12V.The gate of the mosfets are going to a microcontroller or something, 32 pin TQFP-package I believe. The top is scraped off, but there's a 3.579545 Mhz crystal nearby going to pin 3/4.Anyway, see attached image for schematic.

author: NiHaoMike
author_rank: Super Contributor
timestamp: May 28, 2016, 12:04:25 am
content: It's actually a boost converter that doesn't look like one at first glance.http://techno-fandom.org/~hobbit/cars/boost-hack/

author: somlioy
author_rank: Regular Contributor
timestamp: May 28, 2016, 08:54:36 am
content: That's quite clever. Is it possible to regulate the "dc bus" to a constant charging voltage with these components and how does the mcu know when to fire the mosfets?
Wind my own Transformer? - Page 1
Forum section: electronics / projects

author: Christopher
author_rank: Frequent Contributor
timestamp: May 01, 2015, 07:30:18 pm
content: AllI have calculated some of the parameters needed for a transformer used in an offline ac/dc resonant converter.I am a bit stumped when it comes to winding my own transformers, I haven't got a lot of experience in this. Can anyone shed some light on the first steps I need to take?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 01, 2015, 09:31:28 pm
content: K = ?Have people gotten so lazy that there are free, self-advertising screenshot tools now? There's been the PRTSCR button for over three decades, and MS Paint for about two...Anyway, some background on transformer physics might be of help?http://seventransistorlabs.com/tmoranwms/Elec_Magnetics.htmlothers have their preferred references as well.I distinguish between transformers, which are not intended to store any energy at all, and inductors (coupled or single), which are. (Curiously, a common mode choke is an excellent example of a "transformer", as such, that's used specifically in an inductive fashion.)For a transformer, the fundamental limitation is, how much flux you can get into a given core. You can put in more flux by adding more turns, but if you can't fit those turns because the wire is too big, you have a problem. Flux is limited, in the worst case, by the saturation property of the material, but in practical cases, may be much less due to heating, especially at higher frequencies.For an inductor (including coupled inductors), you can calculate based on flux, then calculate required gap based on inductance. The relation Phi_max = Imax * L relates the two quantities. If the core material isn't so easy to control the gap on (you're using pre-gapped cores, open type cores like bobbins, or low-mu materials like powdered iron), then it might be better to calculate from inductance, without concern for flux. (You will have to find flux to calculate losses, though.)Tim
Windows 10, Office-365. Word has problems printing page ranges - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: August 31, 2021, 02:22:21 pm
content: Suddenly,from one day to another, I am unable to print a selection of pages.Nothing happens.But:- The entire document prints- The current page prints.Page x to page y does NOT print.Same issue for all printers, including printing to pdf.The document has not changed.Any ideas?

author: Terry Bites
author_rank: Super Contributor
timestamp: August 31, 2021, 02:24:20 pm
content: https://techcommunity.microsoft.com/t5/word/printing-a-range-of-pages-in-a-multi-section-document-stopped/m-p/2056379

author: AndersJ
author_rank: Frequent Contributor
timestamp: September 01, 2021, 09:53:31 am
content: Thanks for the suggestion.Microsoft however states that the bug was fixed 6 months ago.Perhaps it wasn’t fixed, after all.I managed to eliminate the issue a week ago, by ”repairing” Office-365.It worked a few days, but the problem is now back.
Windows 2000 - Are there any updates after SP4? - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 25, 2016, 03:41:32 pm
content: Has Microsoft released any updates after SP4?If so, where can they be downloaded?

author: Len
author_rank: Frequent Contributor
timestamp: April 25, 2016, 04:15:28 pm
content: As far as I know the last update package for Win 2000 was "Update Rollup 1 for Windows 2000 SP4".Info here:https://support.microsoft.com/en-us/kb/891861Unfortunately the download link on that page doesn't work. A quick google search turns up some alternate download sites but I don't know if they're legit.

author: Zero999
author_rank: Super Contributor
timestamp: April 25, 2016, 06:43:37 pm
content: Quote from: Len on April 25, 2016, 04:15:28 pmUnfortunately that's often the case with old M$ software. Microsoft don't want people using it so they cease supporting it and often remove the service packs and update from their site.Yes, there will be plenty of illegitimate download sites. Quite often they're fine but use with caution: scan everything with up to date AV software.

author: mikeys
author_rank: Contributor
timestamp: April 25, 2016, 06:53:00 pm
content: That's pretty old - I'd recommend upgrading to anything that's still supported if you have that computer attached to a network. However, if it's just an offline shop machine running CNC or something similar, it begs the question, "why fix what ain't broke?"
Windows Caps Lock beep - Page 1
Forum section: electronics / projects

author: Renate
author_rank: Super Contributor
timestamp: July 13, 2020, 11:56:11 pm
content: You know the problem. You had been listening to AC/DC full blast on your PC and you accidentally hit Caps Lock and it blows you away.There's a couple of solutions:Don't use "Toggle Keys", MS's name for the beepingSet your System Sounds to a lower volumeUse a separate cheesy device/speakers for System SoundsUse a separate USB device to announce shift togglingI already had a custom USB volume knob.All I had to do was add in the HID report descriptors for a keyboard.As a system keyboard it gets updates on the Caps, Scroll, Num LEDs (which my wireless keyboard doesn't have).Then all you have to do is make beeps on changes.The beeps are square waves, 500 Hz & 2000 Hz for 100 milliseconds.I took a cheap pair of ear buds and pulled out one of the tiny 12 mm drivers.I fed a GPIO through a 10 µF cap to it.The driver is mounted in a 3/8 hole in the case.I haven't decided if I actually like it.
deleted - Page 1
Forum section: electronics / projects

author: PeDre
author_rank: Contributor
timestamp: March 19, 2020, 01:27:25 pm
content: .

author: s8548a
author_rank: Regular Contributor
timestamp: March 21, 2020, 07:15:47 am
content: At first look(did't translate the website) reminds me of the EEZ Studio project.https://www.eevblog.com/forum/testgear/eez-studio-for-accessing-your-(scpi)-instruments/hope you guy's can contribute a lot if collaborated.

author: ebclr
author_rank: Super Contributor
timestamp: March 22, 2020, 01:38:12 pm
content: If you want to test with Rigol DS5000 ( 5074 ) I will be glad to help you with that task

author: aristarchus
author_rank: Regular Contributor
timestamp: July 17, 2020, 02:23:47 pm
content: @PeDreHi, I hope that you are ok.Tried today the site links and it shows "Error occurred: 404 - not found"Glitch ?

author: ddavidebor
author_rank: Super Contributor
timestamp: September 16, 2020, 12:38:15 am
content: Very nice!

author: babysitter
author_rank: Frequent Contributor
timestamp: September 16, 2020, 10:11:04 pm
content: Just wanted to say thanks for Bildschirmkopie

author: pwlps
author_rank: Frequent Contributor
timestamp: October 24, 2020, 07:26:59 pm
content: Quote from: PeDre on August 21, 2020, 04:21:30 pmIt might be more than 2 seconds if the command triggers a new measurement. In USBTMC, VXI11 or similar protocols you can distinguish between non-responding device and measurement delay using serial polling but in a raw TCP you cannot have this information therefore default delays should be set long.What is the programming language you are using ? I wrote a lot of similar software in NET languages (C#, VB.NET) using various interfaces but didn't implement raw TCPIP yet.
Windows wont boot (windows 7) - Page 1
Forum section: electronics / projects

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: March 18, 2013, 02:18:15 pm
content: Hello i installed windows 7 to my pc and they wont bootThe installation was finethe restart had no problembut when it comes to the part where it prepares the desktop (doent say "preparing desktop")it stucks and then the system restarts.... after a while help

author: c4757p
author_rank: Super Contributor
timestamp: March 18, 2013, 02:49:39 pm
content: This is like "I plugged in my appliance and it won't work, help!" Nobody can say without lots more information.

author: G7PSK
author_rank: Super Contributor
timestamp: March 18, 2013, 06:35:27 pm
content: Just re install it.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: March 18, 2013, 06:44:23 pm
content: Nevermind i solved it thank you.
Winstar's graphic LCD 128*64 - Page 1
Forum section: electronics / projects

author: Mahyar-jafari
author_rank: Newbie
timestamp: February 24, 2018, 07:11:57 pm
content: Hi guys,I want to use Winstar's graphic LCD in an industrial project ,Performance and reliability are more important to me than graphics .Has anyone worked with it?Is it reliable?Has anyone found any problems with using it?Or it is better to use tft or something else ?

author: mk_
author_rank: Regular Contributor
timestamp: February 25, 2018, 10:41:27 am
content: Take care on the lifetime of the backlight....beside this those we used were fine and stable (320x240, 3,5", b/w, without controller) not aviable anymore.

author: danadak
author_rank: Super Contributor
timestamp: February 25, 2018, 01:56:54 pm
content: I have used their character parts, but in low volume. So far hadgood results. My focus was display brightness, uniformity, andcontrast.Regards, Dana.

author: Mahyar-jafari
author_rank: Newbie
timestamp: February 25, 2018, 06:55:47 pm
content: I have another question, i want to drive graphic lcd 128*64 with stm32f4 micro,it seems for me for long life operation and reliability use buffer to isolate I/o pins from lcd ?Is it necessary? Or its better to connect directly ?What do you suggest? Which buffer model is better to use?

author: mk_
author_rank: Regular Contributor
timestamp: February 25, 2018, 07:22:13 pm
content: Quote from: Mahyar-jafari on February 25, 2018, 06:55:47 pmdepends on your market... for a single piece I won`t do anything which makes it more complicated.But if you need some kind of EMC-tests and your stuff should survive industrial or HBM-ESD... add a buffer. Which buffer you must decide by yourself, choose that one which fits best for you..
WIP: Reverse engineering the programming protocol for SiTime SiT8008 - Page 1
Forum section: electronics / projects

author: lty1993
author_rank: Unknown
timestamp: December 10, 2018, 07:46:49 am
content: Hello,I got a SiTime Time Machine 2 and few blank SiT8008BI chips few days ago.Since I cannot find any information about programming protocol online, I would like to reverse it myself.It is been busy recently, the progress maybe slow.==============================================================================[Dec 8, 2018]I managed to capture the programming waveform using a scope. (The model number I am programming to the blank device is SiT8008BI-21-XXN-8.000000)The channel 1 is OE/ST/NC, channel 2 is OUT, channel 3 is VDD.Here is hdf5 file I captured:CH1.h5CH2.h5CH3.h5==============================================================================

author: Rerouter
author_rank: Super Contributor
timestamp: December 10, 2018, 09:02:03 am
content: It really looks like you have a serious amount of crosstalk.at a glance it looks almost like CH3 is used as a chip select,CH2 / CH1 as data pair, possibly SPI,Any chance you can clean up your crosstalk issue, and zoom in a bit on the waveform to get an idea of how the 3 pairs are transistioning,My best guess is the OE is used as MOSI, and the OUT as MISO,

author: lty1993
author_rank: Unknown
timestamp: December 10, 2018, 10:09:04 am
content: It is really hard to probe the signal right without making a custom jig.Anyway, I do not think the cross talk will affect much on interpreting the signal.The OE is a three level signal as shown in next screenshot.I posted the hdf5 files for each channel in the original post. You can use matlab, infiniium offline, or something similar to analyze them.

author: Rerouter
author_rank: Super Contributor
timestamp: December 10, 2018, 10:57:12 am
content: The image is a much easier thing to analyse than 1GB of files that I cannot open without specialized software,So far, CH1, is a clock, don't know what the positive bits are, but clearly 800,000 HzTo me its exactly like SPI, maybe a 1 wire variation on it, looks like update on falling clock, and read on rising.

author: amyk
author_rank: Super Contributor
timestamp: December 10, 2018, 12:50:45 pm
content: I suspect that it's not just a frequency that's directly programmed into the device, but dividers, drive strengths, and other parameters that the programmer tunes in order to get the right frequency output.

author: Bassman59
author_rank: Super Contributor
timestamp: December 11, 2018, 07:35:28 pm
content: Quote from: lty1993 on December 10, 2018, 07:46:49 amOr you could see what Silicon Labs has to offer. Their timing products are well-documented and well-supported.

author: lty1993
author_rank: Unknown
timestamp: December 12, 2018, 07:18:47 am
content: Silicon Labs provides either fixed factory programmed oscillator or serial user programmable parts. However, they do not have any one time user programmable oscillator.It is great to get few one time user programmable oscillator lay around for prototyping, and order factory pre-programmed parts in same form factor for production.
wire colours in USBC power cable - Page 1
Forum section: electronics / projects

author: k8943
author_rank: Regular Contributor
timestamp: July 10, 2021, 10:06:06 am
content: Cut open an Anker USBC+ cable with the humble ambition of using it to power my Raspberry Pi 4 (running Fluidd / Klipper for 3D printer).There are rather more wires than I was expecting. Anyone know their way around these?outer shieldingred, white, green + two naked steel multicore wirestwo shielded pairs: (blue + yellow) and (orange + purple)

author: fabiodl
author_rank: Frequent Contributor
timestamp: July 10, 2021, 10:21:19 am
content: Never assume anything on the colors. I personally cut USB cables where the colors where totally misleading. Give it with a continuity check.

author: k8943
author_rank: Regular Contributor
timestamp: July 10, 2021, 11:03:02 am
content: my thoughts entirely - fortunately the AWG sort of narrows it downfirst time inside a USB-C and guess extra data lines are par for the course

author: tooki
author_rank: Super Contributor
timestamp: July 11, 2021, 06:29:34 pm
content: Quote from: fabiodl on July 10, 2021, 10:21:19 amWell, I’d expect a quality company like Anker to stick to the spec (which does specify colors for the wires other than the differential pairs). And it looks like it does: fat red for power, bare stranded for ground.
Wire gauge for iPad mini 2 soldering - Page 1
Forum section: electronics / projects

author: Stealthrt
author_rank: Regular Contributor
timestamp: February 01, 2018, 05:43:14 pm
content: Hey all I have a simple question that I haven’t been able to find the answer to.What gauge wire would I need to purchase in order to solder a wire to some places on an iPad mini?The area looks like this:Originally I was thinking that 30ga would be fine but I’m not sure.

author: tooki
author_rank: Super Contributor
timestamp: February 08, 2018, 10:36:13 am
content: Why don’t you explain what you’re trying to accomplish? This reeks of XY problem.
Wire glue - SMD? - Page 1
Forum section: electronics / projects

author: kalel
author_rank: Frequent Contributor
timestamp: October 17, 2017, 12:54:41 pm
content: I just saw this interesting video:In which wire glue (it seems the black version with graphite or whatever component is used) was used to get some SMD LEDs to light up, which would have probably otherwise been difficult to solder. Epoxy is added later to make things stronger.Has anyone tested this or a similar method of gluing SMD components or at least LEDs?In very small quantities, silver based glue is available cheaply from China which probably conducts better than wire glue. I'm not sure how much resistance is added when using glue this way.In the video, LEDs are used, and they can work with high resistances/low currents, so it might not work for other types of circuits if too much resistance is added.I am of course not discussing any professional use or anything that needs durability, just interested in any experiments and their results.

author: Dave
author_rank: Super Contributor
timestamp: October 19, 2017, 04:14:58 pm
content: I can see wire glue being useful for making a custom touch panel. Grab a piece of plastic and draw a number of funky shaped touch buttons on its back side.Definitely cheaper than making a PCB for one-off projects.
Wire Question - Page 1
Forum section: electronics / projects

author: NRE_jwarren
author_rank: Newbie
timestamp: January 23, 2024, 10:16:21 am
content: Looking for a single conductor (22-24AWG), shielded cable with a drain wire. There's plenty of single conductor shielded but no drain. It's a PIA having to prep, solder and shrink a drain. Any help would be greatly appreciated (supplier, part number, etc.)

author: CaptDon
author_rank: Super Contributor
timestamp: January 23, 2024, 02:36:13 pm
content: For the most part, any single conductor with shield and drain I have found was shielded with aluminum wrap. Chances are you could find two conductor with foil shield and drain wire more easily and simply connect one of the conductors to the drain. I normally do this because I have tons of two conductor with foil shield and drain wire laying around and is used for balanced T.R.S. 1/4" connectors or XLR connectors. When I do unbalanced 1/4" T.S. connectors I just connect one of the conductors in parallel to the drain and use the remaining conductor for the 'hot'. My theory which seems to hold up in practice is that it cuts the drain resistance in half and acts as an extra shield. One would suspect having a 'drain' inside the shield would be worse and increase induced noise or ground loop hum, but that has not been my experience!! B.T.W., how you prep and treat a braided shield is the mark of a craftsman and professional!! Anything less IS LESS and won't fly in professional studios or at R.F.!
Wire reel valve thingy - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 05, 2018, 01:06:19 am
content: We have a rack of about 40 wire reels from about 18 to 24 AWG.I saw at another company a simple system that looked like the plastic valve on top of a bottle of Wet Ones. You know what I mean? It's a round plastic disc with a star cut into it. The wires are each fed through one of these valves, so you pull on the wire, cut what you need and the wire is held by the valve so it doesn't fall to the ground, etc.What are these thingies called and where can I buy them?

author: ajb
author_rank: Super Contributor
timestamp: September 05, 2018, 01:14:13 am
content: Like these?https://www.heyco.com/Hole_Plugs/product.cfm?product=Universal-Bushings&section=Hole_PlugsSome other options here:https://www.heyco.com/Hole_Plugs/Heyco parts are sold by Mouser (and probably other distributors), although not all of their catalog items are stocked.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 05, 2018, 01:29:25 am
content: Hey thanks! Very close! But I'd like the pizza slices to touch in the middle to grab the wire so it doesn't fall back, you know?

author: ajb
author_rank: Super Contributor
timestamp: September 05, 2018, 01:33:50 am
content: Hmm, not sure about that then. As an alternative, you could make all your holes in whatever your panel is, then run two strips of rubber along them so that they meet in the middle of the holes, possibly with a slight overlap. We had a system like this for a bit on the cabinet where we kept our ribbon cable, until we started buying bigger rolls. I imagine the rubber would better accommodate a wide range of sizes and types of wire as well, I can see something like teflon or THHN slipping through a plastic grommet.

author: DTJ
author_rank: Super Contributor
timestamp: September 06, 2018, 12:01:36 pm
content: Use some Thorsman grommet/glands like this:https://uk.rs-online.com/web/p/rubber-grommets/1366575/

author: IDEngineer
author_rank: Super Contributor
timestamp: September 06, 2018, 02:50:14 pm
content: Sounds like you could make your own rather quickly, using any material you wish to yield any behavior you desire.Example: Take the reusable lid from a tin can (like is used on cans of baking powder, etc.) and cut three lines in your pizza pattern using a razor knife. Mount one edge to something, and push the wire through it. The formed edge of the lid will help stiffen it during use. Worst case if it's still too floppy, run two supports - one top, one bottom.If you mounted (say) a 1x2 piece of trim wood across an array of spools, you could screw down one of these lids in front of each spool. Fast, cheap, and reliable. Granted it may not have the elegance of some packaged solution, but hey... we're all DIY'ers here, right?
Wire strand notation - Page 1
Forum section: electronics / projects

author: Rachie5272
author_rank: Regular Contributor
timestamp: June 19, 2021, 03:12:52 pm
content: A manufacturer says their USB cable has this for the strand count:(7*0.10TC)*2C+(41*0.10TC)*2C+B(32/0.10TC)Can anyone help me figure out what this means? I'm not familiar with this notation. I need to make sure this is a very high quality cable.

author: TimNJ
author_rank: Super Contributor
timestamp: June 20, 2021, 01:22:37 am
content: Quote from: Rachie5272 on June 19, 2021, 03:12:52 pm7*0.1 = 7 strands of 0.1mm wire2C = two conductors (a pair)TC = tinned copperB = shield/braid (maybe)I don't think this will necessarily tell you whether it is a good quality cable or not.

author: viperidae
author_rank: Frequent Contributor
timestamp: June 20, 2021, 04:26:16 am
content: 32 strands seems like not much for the shielding. I would hope it has foil as well.
Wire to board connector choice - Page 1
Forum section: electronics / projects

author: alex89
author_rank: Contributor
timestamp: April 01, 2015, 12:24:49 pm
content: Hi everyone, I've spent a couple days browsing through Mouser catalog but still not sure on what going forI'm looking for a power connector with the following specs:Current rating: anywhere between 5 and 10A should sufficeNominal voltage: at least 300VAvailable in 2-6 positionsEasy crimpable plugPossibly cheapWhat do you think about theMTA 156 series?Any advice here ?Thanks

author: Niklas
author_rank: Frequent Contributor
timestamp: April 01, 2015, 02:02:03 pm
content: Have you checked what copper trace width you need for the current? That width and the required isolation distance will set the minimum pitch. Also consider dual PCB pins for each terminal if you are distributing protective earth.

author: ajb
author_rank: Super Contributor
timestamp: April 01, 2015, 02:11:12 pm
content: JST VH?

author: calexanian
author_rank: Super Contributor
timestamp: April 01, 2015, 02:46:46 pm
content: MTA series is pretty much the industry standard. They should work well for that. You may want to double up positions for the higher currents. We have been using the panduit version of that for 30 years and have never seen a plating/contact failure less than a total corrosion failure from abuse. Unfortunately those are rather difficult to get ahold of in small quantities. The MTA series is far more commonly available. Panduit using the name MASCON for their .156 version. The color used on the body of the female header denote the wire gauge used with it. That is critical to have a good wire match with the particular connector.
Wire to PCB connector suitable for USB 2.0 - Page 1
Forum section: electronics / projects

author: madwolfe
author_rank: Contributor
timestamp: April 14, 2021, 03:02:52 pm
content: I'm looking at getting a custom cable assembly made which will be:[Panel Mount USB connector (fem receptacle)] -  -  - I feel like surely there's some sort of connector out there that normally handles this situation, the USB A plug and socket take up a heap of room. Is there any problem with using a 5-pin JST PHR-5 for example? Obviously it's not ideal but I'm not sure about the typical way this is done besides spending a heap of time digging through Digikey's connector offerings. EMC is of course a concern for me. I suppose I could do a USB micro socket on the wire and a PCB plug but I feel like I can do it better.I have tried asking the manufacturer to suggest a connector etc but I have had no luck. Any suggestions?

author: fordem
author_rank: Regular Contributor
timestamp: April 14, 2021, 03:21:10 pm
content: I believe PCs commonly use a 2x5 header with 0.1" spacing, and one pin removed as a key.

author: voltsandjolts
author_rank: Unknown
timestamp: April 14, 2021, 03:32:29 pm
content: https://www.bulgin.com/us/products/range/circular-data-connectors/standard-usb.html

author: langwadt
author_rank: Super Contributor
timestamp: April 14, 2021, 04:25:59 pm
content: https://www.av-cables.dk/usb-pin-header-stroemkabel/usb-2-0-pin-header-hun-2-00-mm-5-pin-til-usb-a-2-0-hun.html

author: madwolfe
author_rank: Contributor
timestamp: April 15, 2021, 06:22:13 am
content: Never even thought to check how desktops do it and they need to consider EMC.Great, I'll just go with a regular header then.

author: mariush
author_rank: Super Contributor
timestamp: April 15, 2021, 07:14:28 am
content: You may want to use a friction fit or some header with locking mechanism ... regular 10 pin headers work on desktop computers because you don't move computers too much, but if you make a lightweight device it may take physical shocks during shipping, or it may be moved around etc etc.
Wired Or Bus - Error Isolation - Page 1
Forum section: electronics / projects

author: ludzinc
author_rank: Unknown
timestamp: March 13, 2014, 07:04:49 am
content: HiI need to interface to some old equipment that uses a simple clocking protocol to send status indication of devices connected.Simply put, each device has an ID, and after the correct number of clock pluses have been seen, the device asserts it's data line during the clock low period. An idle period at the start of the clocking sequence signals to the devices to start counting pulses.The data line is drive by open collector PNP devices and this are 'wired or' (active high). Any number of devices can assert the line at the same time (this allows for multiple devices to have the same ID).This system is often used to link various areas together, with different 'busses' simply wired together. See the attached pic for (hopefully) some clarification.So far so good - it's simple and pretty robust.- however -If the data line at any point is shorted high (transistor fails - not typical, installation / cabling error - typical!) the whole system is 'stuck high' and it's a bloody nightmare to fault find.I've connected buses together in the past, using a micro to read the state of one bus, and then 'echo' this on other buses, but I'd love to implement this with simple logic. However, every scheme that I can come up with ends up in a race condition and I get the system stuck on all the time.Yes, using a micro works, but (at least to me) this seems like a simple thing to solve but the answer alludes me. Any puzzel solvers out there who can help?Cheers,Simon
Wireless Charger Design Help - Page 1
Forum section: electronics / projects

author: waymond91
author_rank: Regular Contributor
timestamp: March 27, 2020, 12:08:17 pm
content: Hello All!I am working on a project that requires a very small wireless charger. I need about 15mm outer diameter max on the reciever coil, and about 43mm minimum inner diameter or the transmitter coil. The design intent is for the device to charge while nested within the transmitter coil.I don't need to transmit much power at all, only enough to charge a 70 mAh lipo in an hour or maybe 3.Even 100 mW would be passable, 300 mW would be enough to charge the battery at its rated amperage, and 500 mW would be ideal so the device could operate while charging.My transmitter coil is 20 turns. I have tried a wide range of receiver coils, varying from 10 to perhaps 100's of turns.Please see the schematic attached below.I originally hoped that I could increase the power transmitted simply by increasing the voltage on my transmission coil, however as the voltage is increased, the efficiency of the transfer decreases - even after re-adjusting the transmit frequency. I am operating at around 40-60 kHz.There is a zener diode on the output of the rectifier to protect components from overvoltage.Space is at a premium in this design.| Input Voltage | Input Current | Input Power | Output Voltage | Output Current | Output Power | Percent Efficiency ||----------------|-----------------|---------------|------------------|-------------------|-----------------|---------------------|| 5 | 0.065 | 0.325 | 1.97 | 0.006116113 | 0.012048742 | 1.88| 10 | 0.25 | 2.5 | 5.3 | 0.016454517 | 0.087208941 | 0.65| 11.3 | 0.245 | 2.7685 | 6.2 | 0.019248680 | 0.11934181 | 0.69Any ideas folks?I can provide any part numbers or datasheets if required.Or photos of my coils.Thanks for your the help!

author: waymond91
author_rank: Regular Contributor
timestamp: March 27, 2020, 12:53:41 pm
content: I know that comparable resonant charging solutions can get ~50% efficiency. What am I doing so wrong?

author: StillTrying
author_rank: Super Contributor
timestamp: March 27, 2020, 08:19:17 pm
content: Are all the MA4P7455's in the one IC, I can't work out any way to connect it as a bridge rectifier.cdn.macom.com/datasheets/MA4P7455-1225.pdf

author: Marco
author_rank: Super Contributor
timestamp: March 27, 2020, 09:13:45 pm
content: Does your transmission driver detect zero-crossings? Because if it isn't auto-resonant and just drives it at a fixed frequency you can burn a lot of power doing nothing useful, all the energy in the capacitor at switch on gets burned in the transistor.

author: twospoons
author_rank: Frequent Contributor
timestamp: March 28, 2020, 12:58:58 am
content: Also if you push too much energy in during the on phase, then the tank voltage will ring down below 0V and dump energy in the MOSFET body diode.You really do need a proper resonant driver to control the transmit coil. Have you considered using one of the many Qi chips out there? Paired with a Qi receiver it should be easy to get efficiency around 50%. They operate at 125kHz.
Wireless charging... beyond physical limits? - Page 1
Forum section: electronics / projects

author: jcollins
author_rank: Newbie
timestamp: August 28, 2017, 09:40:57 pm
content: So I saw a thing on FB, and I wanted to get others opinions because I am 99.99% sure that this product can't work due to the amounts of energy required to be transmitted.

author: nrxnrx
author_rank: Unknown
timestamp: August 29, 2017, 07:06:51 am
content: https://www.eevblog.com/forum/chat/infrared-laser-wireless-charging/

author: Marco
author_rank: Super Contributor
timestamp: August 29, 2017, 07:58:11 am
content: Can't work, currently the Disney way is still the only practical way shown AFAICS.A giant antenna in a faraday cage, producing a (partial) standing wave. It won't be efficient, but only circuits which resonate with it can tap significant power from it (a whole room of individually insignificant losses will still add up).

author: Etesla
author_rank: Regular Contributor
timestamp: September 04, 2017, 08:08:57 pm
content: This is a joke, right?
Wireless charging for a Fluke ScopeMeter 123 - Page 1
Forum section: electronics / projects

author: Bansci
author_rank: Contributor
timestamp: January 17, 2022, 02:45:49 pm
content: "They" say the best way to get the right answer on the internet is not to ask a question; it's to post the wrong answer.So here's my answer to why I don't use my Fluke ScopeMeter 123. Its charging/battery solution sucks, literally. It drains its battery continuously while off and sucks it dry so that whenever I try to use it in anger, its already dead. I also don't have an original charger (crazy expensive), the jack is very deeply recessed (meaning normal jacks rarely fit), and the recharge time is hours, perhaps thanks to the NiMH chemistry.I've seen loads of great work on the forum where people have made (even turned on a lathe!) charging cables, rebuilt battery packs, and even reworked the charger for more modern battery chemistries. But I hadn't seen someone just add induction charging, so here's my attempt.Let me know what you think and if you have another way of making better use of a scopemeter.