hybridfree/eevblog-posts huggingface dataset:
PCB connector type - Page 1
Forum section: electronics / projects

author: gaminn
author_rank: Frequent Contributor
timestamp: July 10, 2024, 12:16:14 pm
content: Hi, do you think it is possible to buy this 6P 2mm pitch connector (the white one on the right side with wires) but through hole or smt version for PCB?I would like to make a little PCB adapter with this connector which plugs into the white connector on the PCB on the left side.

author: tszaboo
author_rank: Super Contributor
timestamp: July 10, 2024, 12:22:57 pm
content: This is a JST PH or XH type wire to board connector. As far as I know, they only come in wire to board variations.You can buy a small wire assembly and place the same connector on your board.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 10, 2024, 02:42:44 pm
content: Just use plain 2mm header socket strip -- you'll have to check that it fits within the receptacle, but I think there should be enough room for that. You won't have polarization (at least without some additions or tricks) but it won't be well supported anyway and piggybacking on nearby screw holes or something (spacer + screw) is likely needed for support, and that solves polarity just fine. Otherwise, just remember which way it goes.Tim

author: gaminn
author_rank: Frequent Contributor
timestamp: July 10, 2024, 04:08:24 pm
content: I need the adapter to be pluggable to the current PCB without any modifications to the PCB. If the connector is not available then I will make some messy wire harness... Thanks

author: tszaboo
author_rank: Super Contributor
timestamp: July 10, 2024, 04:14:03 pm
content: Quote from: gaminn on July 10, 2024, 04:08:24 pmWhy messy?

author: coromonadalix
author_rank: Super Contributor
timestamp: July 10, 2024, 04:35:43 pm
content: you have kits with housings and crimp-able pinsor as posted already made cables ... length .... pin-count ...and your connector is not a complicated one ... Ebay has many brand / kits ....
PCB construction Time lapse - Page 1
Forum section: electronics / projects

author: Quwat
author_rank: Newbie
timestamp: August 11, 2013, 11:52:54 pm
content: Hello everybodyI decided to make a video of me making my tenth board,its here on youtube. This is for my 3d pov music visualizer project.I'm using the toner transfer method so it takes a while, by the time I found a affordable faster alternative it was to late.Tell me what you think, this is my first time designing and making my own boards.

author: tehmeme
author_rank: Regular Contributor
timestamp: August 12, 2013, 12:06:24 am
content: Hi Quwat,the video link doesn't work.

author: mariush
author_rank: Super Contributor
timestamp: August 12, 2013, 12:08:48 am
content: He probably means this one:

author: tehmeme
author_rank: Regular Contributor
timestamp: August 12, 2013, 12:32:46 am
content: looking forward to seeing the results in another video.

author: kizzap
author_rank: Unknown
timestamp: August 12, 2013, 03:00:55 am
content: what exactly were you doing with the candle?

author: Quwat
author_rank: Newbie
timestamp: August 12, 2013, 04:59:45 am
content: Thanks mariushkizzap:It was to burn off the enamel off the magnet wire I used (from old washing machine). Removing it with sandpaper or a craft knife was too slow alone.

author: TerminalJack505
author_rank: Super Contributor
timestamp: August 12, 2013, 05:46:42 am
content: Quote from: Quwat on August 12, 2013, 04:59:45 amI was wondering if that's what you were doing. I'll have to remember that trick. You're right, sandpaper and/or a knife blade seem to do a half-assed job.

author: KJDS
author_rank: Super Contributor
timestamp: August 12, 2013, 09:28:52 pm
content: Quote from: TerminalJack505 on August 12, 2013, 05:46:42 amI've finally got a solder pot for just that task
PCB Crystal layout recommendations - Page 1
Forum section: electronics / projects

author: Nikos A.
author_rank: Regular Contributor
timestamp: July 05, 2022, 01:26:58 pm
content: Hi guys,I will integrate the MDBT50Q-1MV2 Bluetooth module into my design. According to the datasheet, a 32.768KHz crystal is requiredhttps://www.raytac.com/product/ins.php?index_id=24https://www.raytac.com/download/index.php?index_id=43https://eu.mouser.com/ProductDetail/ABRACON/ABS05-32.768KHZ-9-T?qs=Pyu0ZBy%2FIJbsNYnIET1z3A%3D%3DMy PCB is a four-layer design with the (signal, gnd, pwr + ctlr, pwr + ctrl)Beneath the crystal and the load capacitor, there is a solid ground plane (2nd plane).I've read some design guides for routing the crystals and they recommend not routing signals on other PCB layers running directly below the crystal or below the traces to the X1 & X2 pinsDue to the limited routing space, I routed some control signals (to read the state of the chips) and 1.8V power rail under the crystal in the third and fourth layers. Should this be a problem?

author: LM21
author_rank: Regular Contributor
timestamp: July 05, 2022, 03:48:11 pm
content: 32kHZ are a bit tricky to use, but you have ground immediately below the crystal, if I understood you correctly. Then it does not matter what is below that ground. I think (but dot not know) crystal values, like load resistance, are more critical anyway (especially with 32k crystals..

author: Benta
author_rank: Super Contributor
timestamp: July 05, 2022, 04:58:48 pm
content: I don't see any problem with that layout, 32 kHz is low frequency.The major issue with the 32 kHz crystals is excessive drive power, it should normally be below 1 uW (yes, microwatt), which is the reason for the large series reistors you'll see in many oscillator designs.But if the oscillator IC is already optimized for this, it's OK.

author: Nikos A.
author_rank: Regular Contributor
timestamp: July 06, 2022, 08:50:02 am
content: Thank you guys!!

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 08, 2022, 07:25:21 pm
content: The only thing I'd bitch about is the lack of thermal relief on the crystal's load capacitors.

author: Nikos A.
author_rank: Regular Contributor
timestamp: July 11, 2022, 12:02:29 pm
content: Thanks Alex,Do you use to apply thermal reliefs to every component connected to a ground pour?

author: tooki
author_rank: Super Contributor
timestamp: July 11, 2022, 03:13:12 pm
content: Well yeah, generally speaking, unless you need the maximum current capacity.
Pcb design - Page 1
Forum section: electronics / projects

author: sreejith
author_rank: Newbie
timestamp: August 08, 2019, 08:53:20 am
content: I have PCB designed at a size 68*42mm i want to reduce my pcb into a size 50*30mm currently i have place components in 1 side I have just tried 1st time new to pcb can you please guide on how to place components on both sides and how to route iam working in kicad 5.1.2

author: ratatax
author_rank: Regular Contributor
timestamp: August 08, 2019, 09:00:02 am
content: It's not really different, just switch between F.Cu and B.Cu layers to design both sides (right panel). Flip a component to the other side by selecting it then pressing F, and add Vias to make links between the layers (press V when routing to place a via automatically).Also, put vias at different places to connect both ground planes via a low impedance path
Pcb Design Advice - Page 1
Forum section: electronics / projects

author: townie.au
author_rank: Newbie
timestamp: July 28, 2021, 09:34:11 am
content: HiSo I've built a pcb using 2 x TPA3116D2. They both have the purpose made heatsink and the board functions great.However the project requires me to make more space and am looking at redesigning the pcb to be much more compact.What I would like to know is there a requirement to have large areas of copper tracks for such a amplifier?I understand that these tracks would have less resistance to current and better conduction of heat transfer but I'm thinking the heatsink should be adequate enough on it's own. How small is too small for the pcb?

author: Berni
author_rank: Super Contributor
timestamp: July 28, 2021, 09:51:53 am
content: There is no hard line between this is thick enough and this is too thin and will blow up.A thinner track just has more resistance, so it has more losses at a given current and gets hotter at a given current. At some point the losses can become so large that the track itself gets hot and starts heating near by components. But what is considered as a track getting too hot also varies wideley depending on the ambient temperature, how much heat the components can handle, how much heat the PCB can handle etc...For currents under about 3A people tend to well overestimate how thick of a track they need, even a fairly wimpy thin looking track will handle that fine. But past that, then that the pesky square in the P=I^2*R starts to take over and the power loses really start growing quickly with each extra amp. Its at about 10A where you start needing big thick fills of copper. and at 20A the thicker 2 or 3 or 4 oz copper PCBs become sort of a must have.With the sort of powers your amp runs at it probably doesn't need hugely thick copper, but its hard to say without a picture of what you find as thick. Audio amplifiers also have an advantage that they don't tend to output max power for very long in real world use cases, so they tend to run a lot cooler than what the worst case math predicts.

author: tszaboo
author_rank: Super Contributor
timestamp: July 28, 2021, 10:05:16 am
content: My rule of thumb: 50mm x 50mm can handle 5W in an internal ground plane.So 4 layer board, regular copper thickness. And the heat path needs to be sufficient.For this chip you have another option. Chose the package with the top thermal pad, and place a heatsink on the top.

author: townie.au
author_rank: Newbie
timestamp: July 28, 2021, 09:17:48 pm
content: Quote from: tszaboo on July 28, 2021, 10:05:16 amYep already have the ones with thermal pad on top and the correct heatsink.I'll post pics of the original and redesigned layout to get the thoughts from you guys.
PCB design and schematic for a half bridge power amplifier. - Page 1
Forum section: electronics / projects

author: thambiTeaInnumVarala
author_rank: Newbie
timestamp: March 17, 2019, 08:30:04 am
content: Hi,I am making a half bridge power amplifier that operates at 24 V.The bridge has to supply around 3A current to an inductive load (10mH)The bridge will be controlled using 20kHz PWM from a microcontroller.I have put a ACS712 current sensor in the load path to give feedaback to the microcontroller.There is a IRF9Z24 P FET at the top and a IRFZ44 N FET at the bottom.Both are driven by a single MC34125 Gate driver IC, which has a 12 V power supply.The gate driver is connected to the microcontroller through a HCPL optocoupler.I have maintained 80mil track width for the 3A paths, from a online track width calculator.I have put necessary decoupling capacitors for the optocoupler and the gate driver ic.There are 2 copper filled ground planes on top layer and bottom layer that I have not shown in the pcb schematic for visibility.I have made a schematic and circuit diagram that i have linked here.Pl suggest any modifications or pointers that will improve the circuit.Thanks.BS

author: diyaudio
author_rank: Frequent Contributor
timestamp: March 17, 2019, 01:45:05 pm
content: So many things needs attention. I recommend you post a working breadboard version capped at 1A, verify you can actually achieve "amplifying a signal"

author: thambiTeaInnumVarala
author_rank: Newbie
timestamp: March 18, 2019, 02:31:19 am
content: I will get a version working on prototype board and will post it.I will limit the current to 1A with pwm duty cycle control.Thanks.
PCB design for a ASA - Page 1
Forum section: electronics / projects

author: electronics technician
author_rank: Regular Contributor
timestamp: September 30, 2014, 04:58:45 pm
content: where can i create my own pcb layout for a project im working onlinks and /or site names will be helpfull thanks

author: rdl
author_rank: Super Contributor
timestamp: October 01, 2014, 03:57:57 am
content: There is some good info here:https://www.eevblog.com/forum/eda/
PCB Design - Slanted traces due to misaligned pads and traces - Page 1
Forum section: electronics / projects

author: sentry7
author_rank: Regular Contributor
timestamp: January 13, 2016, 03:01:28 am
content: Hey guys,I'm doing a board with a 0.8mm pitch LQFP, but the footprint doesn't exactly align with a regular grid; the traces connected to the pads are slanted as in the screenshot. If I zoom out, of course, the slanted lines are interpolated and look straight, but internally, aren't really straight. My snap-to-grid settings are set at 0.1mm.If I'm sending this out for production, will the traces come out straight? Are the milling machines precise enough to know that the traces are crooked?

author: c4757p
author_rank: Super Contributor
timestamp: January 13, 2016, 03:10:57 am
content: What the hell PCB layout software are you using that can't just resolve that by keeping those as vertical segments?

author: sentry7
author_rank: Regular Contributor
timestamp: January 13, 2016, 03:12:49 am
content: Quote from: blueskull on January 13, 2016, 03:07:13 amBut then, the part won't align with the footprint, right?

author: free_electron
author_rank: Super Contributor
timestamp: January 13, 2016, 03:13:44 am
content: your part center is off-grid. fix that. all the rest will self-fix then.

author: sentry7
author_rank: Regular Contributor
timestamp: January 13, 2016, 03:15:09 am
content: Quote from: c4757p on January 13, 2016, 03:10:57 amIs that what good software is supposed to do? I'm probably using not-so-good software then. I'm still on expressPCB's package.

author: sentry7
author_rank: Regular Contributor
timestamp: January 13, 2016, 03:34:11 am
content: Sorry guys, false alarm. Seems to have fixed itself. I moved the footprint around and it found its center.
PCB Design - Page 1
Forum section: electronics / projects

author: Jon86
author_rank: Frequent Contributor
timestamp: May 02, 2013, 07:36:43 am
content: I'm working on designing a very simple PCB to be manufactured in a small batch by iMall.It's just a power supply based on a few LM ICs.I only want to do a very simple project to try their service.What should I know?Are there any good tutorials out there for this sort of thing?Any help would be greatly appreciated

author: johnboxall
author_rank: Unknown
timestamp: May 02, 2013, 09:15:54 am
content: http://alternatezone.com/electronics/pcbdesign.htm
PCB Etching Marker Issues - Page 1
Forum section: electronics / projects

author: BlackCow
author_rank: Newbie
timestamp: December 17, 2009, 08:37:26 am
content: So I've had good luck with the toner transfer method and ferric chloride on PCBs but sometimes I need to fix things with a marker. I found a regular sharpie didn't do the trick so I bought a special Industrial Sharpie.It was advertised as being a "specially formulated ink for industrial use" that "remains permanent under most chemical washes"I guess Ferric Chloride isn't one of those chemical washesCould anyone recommend a marker to use that will survive a ferric chloride bath?

author: Unknown
author_rank: Unknown
timestamp: December 17, 2009, 09:50:47 am
content: Hi,A "Dalo" Pen will workhttp://www.jprelec.co.uk/store.asp/c=689/Etch-Resist-PCB-Marker-Pen---Decon-DaloI used to use these back in the 80's to do PCB's by hand with Ferric Chloride etch. I switched in the 90's to Ammonium Per-sulphate.I need to work on getting toner transfer working lol would also be nice to get copper plating working so I can do through holeRegards,Kat.

author: BlackCow
author_rank: Newbie
timestamp: December 17, 2009, 06:05:39 pm
content: Thank you! I trust something that's specifically advertised to be for etching PCBs.I'm curious, is there an advantage to etching with Ammonium Persulphate?Cheers.Edit:They only ship to the UK. I'm having trouble locating one from a place that ships to the US. I would have thought Jameco would have it!Are there any other products like this that I would have better luck finding?

author: qno
author_rank: Frequent Contributor
timestamp: December 17, 2009, 10:07:02 pm
content: One advantage is that it does not make that rusty stains.With etching I do not see any difference.But I do only single sided.I use the UV method. I print with a laser printer on a transparent sheet and put it under a UV light for a couple of minutes.Then take of the protective ink with NaOH.

author: Unknown
author_rank: Unknown
timestamp: December 18, 2009, 09:27:20 am
content: Hi,http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2359513There is a page of pens there

author: Simon
author_rank: Unknown
timestamp: December 18, 2009, 01:31:52 pm
content: you can get the pens at a stationery shop, don't pay big bucks to rip off companies like maplin that see permanent marker pens for X 10 their value

author: APS
author_rank: Contributor
timestamp: December 31, 2009, 02:12:24 am
content: For corecting toner transfer I use permanent markers that are used for writing on CD/DVD. You can find these with the range of tip size.I usually put the paint twice. Put the first coat let it dry and stipple next coat over it.

author: Simon
author_rank: Unknown
timestamp: December 31, 2009, 07:12:56 am
content: yes those are the same pens that electronics suppliers sell as PCB pens for ridicolous prices
PCB exposure using a 3D printer - Page 1
Forum section: electronics / projects

author: zapta
author_rank: Super Contributor
timestamp: November 01, 2014, 03:14:46 pm
content: Here is an interesting DYY PCB howto that replaces the mask and exposure with 3D printing using a filament that sticks to copper.http://www.instructables.com/id/Make-Flexible-Circuit-Boards-Using-A-3D-Printer/?ALLSTEPS

author: miguelvp
author_rank: Super Contributor
timestamp: November 01, 2014, 04:13:30 pm
content: That's is cool, but why not just use a flatbed plotter with ink?I bet that will give more precise traces and if it's vector driven it could do angled traces and even length matched traces.

author: Zad
author_rank: Super Contributor
timestamp: November 01, 2014, 04:27:00 pm
content: Uh. Erm... There seems to be something about 3D printers that inhibits the human facility to ask the question "Why?"1. Print onto 2 cent per sheet OHP transparency.2. Expose.3...

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 01, 2014, 06:43:31 pm
content: Quote from: Zad on November 01, 2014, 04:27:00 pmSure but then you need sensitized copper and a UV light. This way if you already have the 3D printer... But I wonder how much that filament costs.

author: Fred27
author_rank: Unknown
timestamp: November 01, 2014, 07:26:07 pm
content: It's great that people try out different things, but I won't be doing this with my printer. UV exposure may require sensitised boards but give far better results.

author: con-f-use
author_rank: Unknown
timestamp: November 01, 2014, 07:32:58 pm
content: Quote from: Fred27 on November 01, 2014, 07:26:07 pmIn addition to being much faster and cheaper (as well as having a better resolution?).

author: ElektroQuark
author_rank: Unknown
timestamp: November 01, 2014, 07:47:56 pm
content: Better using a plastic that not stick to copper so you can reuse it.
PCB Express, Trackes and gcode for LinuxCNC. - Page 1
Forum section: electronics / projects

author: mictas
author_rank: Regular Contributor
timestamp: April 04, 2014, 08:42:20 am
content: Okay, So in ExpressPCB I have drawn up a DIY arduino board. Now what I would like to do is create the tracks, the ones I have drawn in the attached image I am happy with myself. (note that I have seen that the LED is not linked to ground and already fixed that)Things I am having trouble with:Finding a free application that I can import my .pcb or .dxf file and create the tracks.Create the gcode for LinuxCNC (I know it dose not matter all that much but still, just so you know)Have I gone down the right path or should I have used another program?

author: GeoffS
author_rank: Unknown
timestamp: April 04, 2014, 08:59:34 am
content: EDITED: You mention that you can produce a .dxf file from ExpressPCB. Most(all?) CAM programs should be able to produce gcode from this. There are also a number of free DXF to gcode converters for both Windows and Linux.If you use Eagle there is an add-on to create gcode files from your design.(Ask Shane at the hobarthackerspace as he has done this)

author: mictas
author_rank: Regular Contributor
timestamp: April 04, 2014, 09:09:38 am
content: Quote from: GeoffS on April 04, 2014, 08:59:34 amI can only export files as pcb and dxf. I can export an image file, but that only rendered the through holes.As for contacting Shane I'm going to do that once I have the gcode and not before.

author: GeoffS
author_rank: Unknown
timestamp: April 05, 2014, 01:27:16 am
content: The Eagle g-code plugin will give you more control over the milling setup than will converting the ExpressPCB files to DXF then gcode.Take a look herehttp://pcbgcode.com/You board shouldn't be too hard to convert to Eagle.
PCB fab with better support? - Page 1
Forum section: electronics / projects

author: eecook
author_rank: Regular Contributor
timestamp: January 24, 2022, 02:10:11 pm
content: Hi All,Is there any Chinese PCB fab with good support? I use PCBWay a lot but I get very frustrated with "Catherine" as she speaks really bad English. In general too, I don't think the support is great despite the language barrier.Thanks,-Simon.

author: jmelson
author_rank: Super Contributor
timestamp: January 24, 2022, 04:14:24 pm
content: PCBWAY has done fine for me. I have had them do several dozen board designs, and even worked out with them the best way to panelize my design with mouse bites and/or V-scores. Maybe you can get switched to a different representative.Jon
PCB internal shorts due to heat? - Page 1
Forum section: electronics / projects

author: davegravy
author_rank: Regular Contributor
timestamp: February 28, 2022, 06:23:01 am
content: My 4 layer prototype was working fine then something happened and I circuit my board consuming much higher current and getting quite hot. I went probing around and found a bunch of nets shorted to ground that shouldn't be, and that weren't previously shorted.I have a bunch of DFN packages with grounded exposed pads that like to form solder bridges with their pins, causing behavior similar to this, so I desoldered them - no improvement. I went further and desoldered all the components connected to these nets... same issue.I now can't see any possible cause for the shorts unless they occur internally between layers. Again, these shorts weren't present previously, so is it possible for a short to develop internally due to heat? There's no visible sign of heat damage, is it likely for these kinds of shorts to occur before visible damage occurs?

author: AndyC_772
author_rank: Super Contributor
timestamp: February 28, 2022, 09:58:02 am
content: Really excessive heat is more likely to cause delamination, which might break vias and cause open circuits to appear, not shorts.The most common cause I've seen for internal shorts to develop within a PCB is mechanical damage. For example, if a shakeproof (star) washer is used against the PCB surface, and the screw is then over tightened. This causes the teeth of the washer to bite through the substrate and short internal layers together. I've also seen it where an enclosure screw is too long and has chewed the edge of the PCB, with similar results. Could something like this have happened?It's interesting that you see a fault with more than one net. Do they all appear close to each other on the PCB somewhere? Try highlighting them in your PCB editor and see if there's a pattern.

author: davegravy
author_rank: Regular Contributor
timestamp: February 28, 2022, 01:15:37 pm
content: Quote from: AndyC_772 on February 28, 2022, 09:58:02 amI thought I had removed all connected components but had missed a couple. Today I learned that the continuity check on my multimeter considers 30ohms a short. So these nets aren't actually shorted to ground.Strange because I'm sure it didn't beep for these previously

author: thinkfat
author_rank: Unknown
timestamp: February 28, 2022, 01:31:43 pm
content: You can create shorts internally through really excessive heat if you manage to turn the PCB into carbon. But it will be very visible (and smell very badly).
PCB Female connector for panel - Page 1
Forum section: electronics / projects

author: metRo_
author_rank: Regular Contributor
timestamp: March 30, 2016, 12:42:11 pm
content: Hello,I'm designing a PCB where one side will have panel connectors like a motherboardand on that side it will have a panel.For sensors I'll use connectors like thishowever I have two power outpus on that panel and I only find male connectors like thisis that ok? The outputs are 12V 1A so my sense tells me that have a male connectors sourcing power could be dangerous.

author: mariush
author_rank: Super Contributor
timestamp: March 30, 2016, 01:19:52 pm
content: Really? There's literally thousands of connectors you could use for power ... just pick something you like :http://pt.farnell.com/wire-to-board-connectors- filter by connector type, the number of rows, the pitch spacing (for 1A you would probably want 2.5mm or higher, the pci-e connector has 4.2mm pitch spacing)If you want, you could go with Molex Mini-Fit (the same connectors used on video cards for the PCI Express connectors) but they're more expensive compared to series of connectors made by other companies (see JST ,HiRose, TeConnectivity etc)

author: metRo_
author_rank: Regular Contributor
timestamp: March 30, 2016, 02:11:26 pm
content: Quote from: mariush on March 30, 2016, 01:19:52 pmI have made an wrong assumption that is why I had problems found a connector.
PCB fonts recommendations - Page 1
Forum section: electronics / projects

author: drakejest
author_rank: Regular Contributor
timestamp: August 08, 2020, 12:19:48 am
content: Hello i cant decide what fonts to use for the text in my PCB. The default font of my design tool is kind of lack luster, i mean it readable but kind of not pleasing to look at. It will be used for labing pins and headerSanserif seems to be the defacto for some tools, but id like to hear from you guys what fonts did you like on your pcbI use JLCPCB and no need to worry about technical issues since the texts are placed in a silkscreen layer so it will show up as its supposed to (or atleast relatively close)

author: Benta
author_rank: Super Contributor
timestamp: August 08, 2020, 12:23:15 am
content: They should be readable. Period. Do you really think someone will swoon over your artistry?
PCB footprint for WQFN-16 - Page 1
Forum section: electronics / projects

author: OM222O
author_rank: Frequent Contributor
timestamp: October 06, 2019, 12:05:52 pm
content: I wanted to design a footprint for the QFN version of the ADS1219, but I'm not sure which dimensions to use. The default packages in my design tool use 1.6mm squared for the thermal pad, but the T.I. datasheet specifies half of that, with only 0.8mm squared! (page42)http://www.ti.com/lit/ds/symlink/ads1219.pdf?HQS=TI-null-null-mousermode-df-pf-null-wwe&DCM=yesthis leaves a large gap between the thermal pad and the rest of the pads which is nice since it prevents shorts by solder bridges, but it also seems too small, I could only fit 1 via inside that pad with minimum hole size that manufacturers recommend (10 mills). from the images I can also see the exposed pad goes a lot closer to the rest of pads (more inline with the 1.6mm squared) , so I'm not sure which dimensions to use.

author: ThomasDK
author_rank: Regular Contributor
timestamp: October 06, 2019, 02:16:26 pm
content: The ADC uses less than 0.5mA, so I wouldn't worry about thermal vias.I would do as TI recommends - the datasheet even shows the single via in the pad.

author: wraper
author_rank: Unknown
timestamp: October 06, 2019, 02:34:12 pm
content: You can make it equal to pad dimensions on IC but make sure to reduce aperture of solder paste stencil to about 50% of area of the pad itself.

author: wraper
author_rank: Unknown
timestamp: October 06, 2019, 02:39:14 pm
content: Pages 41 and 42 of the datasheet show packages with contradictory thermal pad size. Second one matching that footprint with tiny pad. IMHO look on actual IC and make accordingly.EDIT: but picture on page 41 with larger pad does not have pad dimensions. So most likely this IC just has such tiny thermal pad.

author: isometrik
author_rank: Regular Contributor
timestamp: October 06, 2019, 02:59:04 pm
content: Page 43 of the datasheet shows the recommended footprint (land pattern data).

author: OM222O
author_rank: Frequent Contributor
timestamp: October 06, 2019, 06:20:55 pm
content: I think will stick to the pad size specified by the datasheet, since like Thomas mentioned, I don't think the thermal via isn't even necessary in those power levels. It just seemed a bit odd to me.
PCB for Chinese 4k game stick - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: July 14, 2024, 12:13:30 pm
content: I accidentally broke the connections of the part S10BdA1 of this 4k Chinese game stick at the opening process.Is there any PCB diagram of this board to find out how this specific part is connected with the other neighbor parts? How can I identity exact type of part itself by its marking (I suppose it is a voltage regulator)?

author: daisizhou
author_rank: Super Contributor
timestamp: February 20, 2025, 10:57:01 am
content: STI3408B
PCB for Crockcroft-Walton Multiplier available? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 03, 2019, 12:27:03 pm
content: Hi!Associated with the development of a home-built Huntron 2000 Component Tracker, I found a "Preamp Transformer" with 220V 50mA (twice) and 6.3V 0.8A (twice) that will do nicely for the high voltage deflection and component-test supply, but I'd like to use the second 220V H.T. winding with a multiplier for the 1250-2000V which a CRT needs.Can anyone tell me if there's a ready-made 5 or more stage Cockcroft-Walton Multiplier PCB I can buy? I've looked on fleabay, Banggood, Aliexpress, etc., and can't find anything handy that meets the need yet!Chris Williams

author: Gyro
author_rank: Super Contributor
timestamp: March 03, 2019, 12:31:23 pm
content: The simplest way is to use a piece of bare FR4 or similar insulating sheet. That way you can drill the holes for the components that you actually have and set your own creepage distances. No extraneous copper pads.

author: beanflying
author_rank: Super Contributor
timestamp: March 03, 2019, 12:39:30 pm
content: Random find I came across some time ago might do what you need with a bit of a mod.eBay auction: #273740937131or chase up ionizers might get you what you want.

author: GadgetBoy
author_rank: Regular Contributor
timestamp: March 03, 2019, 07:15:06 pm
content: I've played around with CW adders a lot, and the best way is to solder them discreetly instead of using a PCB, especially if you're working with kV, lessens tracking.
PCB gold contacts - Page 1
Forum section: electronics / projects

author: pgross
author_rank: Contributor
timestamp: August 17, 2013, 11:39:25 am
content: I’m wondering if there are any solutions to prevent wear and tear on goldflashed PCB contacts. Some manufactures utilises some kind of oil on their contactsand connectors, but while cleaning these contacts the oil will inevitably be washed awayand some new lubrication must be applied. The contact oil prevents oxidization andmaintain low resistance contact.I know that Santolubes,http://www.santolubes.commanufactures contact oil ACCL(Anti Corrosion Connector Lubricant), their products are widely used in the aerospace andaviation industry. In my Company, we use their ACCL oil on small gold contacts carryingvery low audio signals and power. What about contact pads on PCB? As an example:I want to clean the contact pads in a multimeter with Isopropanol, but I’m not sure if Ishould apply contact oil afterwards. Are there any drawbacks using oil in this kind ofapplication?Please let me know your opinion.Best RegardsPeter

author: Dave
author_rank: Super Contributor
timestamp: August 17, 2013, 12:56:29 pm
content: Gold doesn't oxidize.

author: SeanB
author_rank: Super Contributor
timestamp: August 17, 2013, 03:10:33 pm
content: If the coating is thin and porous the copper underneath does, and if it wears through from wiping action the same applies. Use a lubricant on them, just use sparingly, just enough to have a thin sheen on the contacts only applied with a Q tip.

author: Dave
author_rank: Super Contributor
timestamp: August 17, 2013, 10:22:52 pm
content: The pads on PCBs that are not intended for soldering, but for making contact with some other connector (e.g. edge connector on a PCI card) or switches (e.g. multimeter's range switch), get a much thicker gold coating. Not long ago someone posted a video showing the manufacturing process of a PCB. The pads that require a thick coating get a second immersion into the gold solution.I'd put it like this: If you find lubricant inside the instrument you are working on, reapply the lubricant after you are done with the repairs. If there is nothing, I'd leave it that way.

author: pgross
author_rank: Contributor
timestamp: August 18, 2013, 08:05:33 am
content: Thanks for your comments.Well, it is hard to see if the PCB range switch is lubricated. Between the gold pads I can see some very faintblack traces on the silkscreen - dont know if it is contamination from the wiper contacts or lubrication.The Santolube ACCL oil I referred to is very thin and it seems to dry up almost invisible.Best RegardsPeter

author: fcb
author_rank: Super Contributor
timestamp: August 18, 2013, 11:03:08 am
content: Typically there is ENIG (immersion gold - used to maintain solderability) and there is hard-gold (edge connectors), there is a cost difference.I recently designed something with nickel coating, and we found huge differences between manufacturers as to scratch resistance (ranging from scratch it with a curved brass point, through to having to chisel at it to scratch it).These guys are the nuts:http://www.p-m-services.co.uk/hard_gold.htm
PCB Guide Pins / Rigid Tooling Pins - Page 1
Forum section: electronics / projects

author: ChiefPFF
author_rank: Contributor
timestamp: February 07, 2013, 05:40:01 pm
content: I'm building a BoN test jig and have been trying to find some nice bullet tip type guide pins for it. Despite ferocious googling I can't seem to find any. I realise that they're not a common part, but was hoping that there would be someone out there producing a range for various ISO hole sizes, because tbh I'm on a tight budget.Can anyone recommend where I might find some off the shelf?..or am i going to have to get some milled? (eesh)

author: robrenz
author_rank: Super Contributor
timestamp: February 07, 2013, 06:14:03 pm
content: TryMisumi.This can be a seriously overwhelming experience. It is worth it to spend several hours being aware of all they have. This is the ultimate Erector set for adultsMany, many components areconfigureable to your dimensionsso its like having your own machine shop.

author: fcb
author_rank: Super Contributor
timestamp: February 07, 2013, 06:27:12 pm
content: I've used this company time and time again for precision pins:http://www.pts-uk.comAgain, probably not quite what you are looking for - but in the same area:http://www.coda-systems.co.ukBoth companies have given me superb service and are great to talk to.

author: DaveW
author_rank: Frequent Contributor
timestamp: February 07, 2013, 08:22:50 pm
content: Another reccomodation for Coda Systems here, I'm using their pins at the moment on some ATE fixtures,http://www.coda-systems.co.uk/catalog/Rigid_Tooling_Pins.html

author: ChiefPFF
author_rank: Contributor
timestamp: February 07, 2013, 11:52:47 pm
content: Fantastic info guys - thanks very much! Those pins from coda look just rightbut now I've started looking through Misumi.. they have got some pretty cool looking stuff so might have to find an excuse to use them!Great! Thanks again for your help.edit: in fact now that I'm getting through the misumi range - looks like they'll be perfect for my heatsink setup. Brilliant.
PCB Headers pitch 2.0mm angled, male + female, where? - Page 1
Forum section: electronics / projects

author: onesixright
author_rank: Frequent Contributor
timestamp: October 11, 2015, 09:59:59 am
content: Hi All,Im looking for the last days for some PCB headers (1x11) male + female, 2,0mm pitch (need about 20 pairs). Having a hard timing finding thisI did found some male versions, but the female version are difficult.I looked at (TME, Mouser, Conrad, eBay, ...).Preferable Europe.Thanks!
PCB heater - Page 1
Forum section: electronics / projects

author: donBaton
author_rank: Newbie
timestamp: February 03, 2025, 10:08:33 am
content: Let me introduce the elements of a small project—perhaps someone will find it interesting. This is a heater based on a PCB, which is often used as a heated bed for 3D printers. This attached small Python script will help you create a footprint for KiCad and calculate the track resistance.The second script will help you select a pull-up resistor for an NTC thermistor to linearize it within a specific temperature range. It will also generate lookup table that you can use in your program.Code:// return temperature degree*10int16_t analog2temp(uint16_t adc){int raw = 0;int size = sizeof(lookup)/4;if (adc<=lookup[size-1]) return (lookup[size-1]+5)/10;if (adc>=lookup) return (lookup+5)/10;for (uint8_t i = 1; i < size; i++){if (lookup < adc){// interpolationint16_t celsius = 0;celsius = lookup[i - 1] +(lookup[i - 1]-adc) *(lookup -lookup[i - 1]) /(lookup[i-1] - lookup);return celsius;}}return 0;}I hope this will be useful to someone.

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: February 03, 2025, 03:03:24 pm
content: What board is there in the second picture? I can see a grey board.

author: donBaton
author_rank: Newbie
timestamp: February 03, 2025, 03:05:26 pm
content: ESP32-C3

author: Gyro
author_rank: Super Contributor
timestamp: February 03, 2025, 07:42:03 pm
content: A single via at the end of the heater trace is potentially creating an unnecessary weak spot.

author: donBaton
author_rank: Newbie
timestamp: February 03, 2025, 08:03:26 pm
content: You are right, but layout is an example only and not ordered yet because of Chinese new year. I have time to modify layout.Thanks!
PCB high-speed signal integrity - VNA measurement? - Page 1
Forum section: electronics / projects

author: bestel
author_rank: Contributor
timestamp: August 06, 2023, 07:49:56 pm
content: Hello,I'm having some problems with high-speed digital signals (DVI and USB 3.0) with a design already in production (i'm not the designer but I'm in charge of the "version 2") .I did some research and saw that it was possible to use a VNA with a TDR to measure impedance versus time and make the eye diagram.This is a "production" PCB, so there are no SMA connectors, and I only have a LibreVNA (2 ports VNA 6Ghz).My first idea was to connect a "50 ohm line" directly to the PCB, but I'd like to solder nothing to it (if possible).So here are my ideas:Buy the Auburn tech P-20B 12 GHz RF probeMake a homemade passive probe, with no load, based on an RG58 coaxialI'm afraid of the "500ohms load" (x2 for the eye diagram) inserted with Auburn probes...And why is there no "50 Ohms coax to probe" commercially available? - Normally when I ask "why aren't there any" = it's because my question/idea is stupidDoes anyone have any experience or advice for this type of measurement?I'm also thinking of buying the Sensepeek system to help me adjust the probesThanks for understanding.

author: coppercone2
author_rank: Super Contributor
timestamp: August 07, 2023, 05:58:19 am
content: probobly buy the 12 ghz probe so you are not responsible and or wrongfully blamed for some kind of production mess up

author: nctnico
author_rank: Super Contributor
timestamp: August 07, 2023, 08:18:33 am
content: A better option is to simulate the traces. For example using Sonnet or get a PCB package that has impedance / crosstalk / signal integrity simulation (like Orcad PCB Designer Pro). In the end simulation will give a much better result than measuring because measuring at several GHz requires expensive test equipment and probes.

author: bestel
author_rank: Contributor
timestamp: August 07, 2023, 12:48:05 pm
content: Thanks guys.I'm freelance and these measurements are not expected, I just need to help someone (in charge of these modifications), so this can be considered as a side project.Some measurements have already been made on "version 1" (they rent a 12 GHz oscilloscope + a signal generator) so I'll be able to compare and see if what I see is good or not.My first goal is to reproduce these measurements with my LibreVNA, because from what I understand, I think it should be possibleThen I'll be able to measure "version 2" of the card to confirm that we've solved the problem (and I'll have a "home-made" solution for future missions).I really want to gain experience on this kind of project and be able to do this kind of measurements, but I can't afford a big license or big hardware.(note: the company I work for isn't a big fan of simulation, so they won't be investing in this area).
PCB Holder for SMD assembly - 3D Printed edition - Page 1
Forum section: electronics / projects

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 16, 2020, 05:44:59 pm
content: Hi,A few years ago I shared my design for a PCB holder:https://www.eevblog.com/forum/projects/pcb-holder-for-smd-assembly-microscope/msg531502/#msg531502The original version was built from aluminium and really required a milling machine to make it.Here is an updated version that can be built with a 3D printer.The design was done in Fusion 360, exported to STL and printed in PLA.Photographs360 Fusion ModelThe parts were printed with the 1/4- 20 thread. It was necessary to clean the threads with a tap after printing. No other processing was needed.Fusion Files I have attached the Fusion 360 files for anybody who wants to build their own. You may want to change the thread to metric, depending where you live.Regards,Jay_Diddy_Bpcb vice.zip(563.59 kB - downloaded 228 times.)

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 16, 2020, 05:47:44 pm
content: Hi,The parts were printed in this orientation:It took about 1.5 hours.Regards,Jay_Diddy_B

author: Nuno_pt
author_rank: Frequent Contributor
timestamp: May 16, 2020, 07:02:58 pm
content: Very nice work, will print one some as the printer arrive.

author: itdontgo
author_rank: Regular Contributor
timestamp: May 17, 2020, 11:53:04 am
content: Nice
PCB inductor coil design using silver ink on PET - Page 1
Forum section: electronics / projects

author: Surajg
author_rank: Newbie
timestamp: November 16, 2022, 06:50:46 am
content: Hello Everyone,I am newbie working on a project using LDC1314 (https://www.ti.com/lit/ds/symlink/ldc1314.pdf?ts=1668511175226).There is one similar project in this TI reference design:https://www.ti.com/lit/ug/tidu954a/tidu954a.pdf?ts=1668580511933&ref_url=https%253A%252F%252Fwww.google.com%252FThis project uses 4x4 Pcb coil antenna which are multiplexed and read using LDC1314.I am working on similar project where matrix is of 8x8 and want to uniquely detect action figures. However the antenna surface should be flexible instead of hard Pcb.One option is to use polymide based based flexible Pcb which includes copper but those are too expensive.On some google search I got results regarding Silver and carbon ink PET circuit (https://www.membraneswitch-fd.com/china-silver-and-carbon-ink-pet-circuit-p.html) and this seems low cost than PI based flex PCB.Aim : Design the hard PCB coil design part using silver ink or carbon ink on PET for cost reduction.Queries:1. Is it possible to design 4x4 PCB coil like TI reference design on using silver ink or carbon ink on PET?2. Usually copper based PCB coil have online calculator to measure inductance and different parameter. Is there any online calculator which can help me design this coil with silver ink or carbon asmaterial for coil design?3. Can I take the TI reference design Gerber file as is and print the antenna part (keypad part without dome) on silver ink and expect same result ashard Pcb with pcb copper coils?4. Does the trace which are routed after the coil design in such circuit affects the inductance value of coil?Thanks
PCB inductor Design  - Page 1
Forum section: electronics / projects

author: GoatZero
author_rank: Regular Contributor
timestamp: March 06, 2014, 07:44:32 am
content: Im working in this 10A power supply, as part of the circuit protection i got 3 choke inductorsHowever im stuck trying to find out how should i plug this inductor into the circuithttp://katalog.we-online.de/kataloge/eisos/media/pdf/7448262510.pdfThe datasheet shows two ways to use it, common mode and differential modeUsing Altium i designed my own PCB footprint just like the datasheet suggested however im having trouble trying to find which is the right way to draw my pcb traces , as you can see in the pictureShould i plug only pins 1 and 4 ?Should i short 1 and 2 and then 3 and 4? (Common mode)Should i use the differential mode? (Pins 1,4,3,2 in Series)Hope anyone can help out

author: Richard Head
author_rank: Frequent Contributor
timestamp: March 06, 2014, 08:06:43 am
content: What purpose do the large inductors serve?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 06, 2014, 08:22:28 am
content: You're using it wrong. That's a common mode inductor.Also way too much capacitance on the regulator output.Tim
PCB inductor with magnetic cores  - Page 1
Forum section: electronics / projects

author: skylape
author_rank: Newbie
timestamp: February 16, 2021, 04:44:33 pm
content: As the title suggests, due to design requirements, I would need to build a PCB inductor with a magnetic core embedded. That being said, how do I really specify an area is designated for the magnetic core and what material I want for it?. Im using EAGLE PCB.

author: penfold
author_rank: Frequent Contributor
timestamp: February 16, 2021, 05:52:16 pm
content: Is this for one small area of a larger board you wish to designate? When you say material, so you mean PCB material or magnetic core material?As far as PCB layout logistics, you just need to define the appropriate cutout regions and any additional hardware mounting holes for the planar core and manually draw your "turns" in, you can do this as a "component" or just fully manually.. defining a component can be easier for placement and preventing accidentally deletion of part of the turns
PCB Inline Screw Mounts? - Page 1
Forum section: electronics / projects

author: Rerouter
author_rank: Super Contributor
timestamp: August 24, 2017, 12:16:48 pm
content: For a sacrificial I/O card, I need a way to hold it to the front panel firmly, only issue is I only have 5.8mm on one side and 3.1mm on the other.So far i have dreamed up using a slot in the board and manually soldering a brass threaded M3 standoff in the gap, However i felt i would ask is there any other ways to solve this problem? it seems to me that buried under some bizzare name would be some proper SMD or through-hole solution rather than relying on a large tack of solder on 4 SMD pads.

author: veryevil
author_rank: Unknown
timestamp: August 24, 2017, 12:34:57 pm
content: http://katalog.we-online.com/en/em/WP-SMRA_WOPINS?sid=e23d72e80ehttp://katalog.we-online.com/en/em/WP-SMRA_PINS?sid=e23d72e80ehttp://www.keyelco.com/category.cfm/Screw-Terminals-Terminal-Blocks/Screw-Terminals-Metric-Sturdi-Mount/p/476/id/478

author: DTJ
author_rank: Super Contributor
timestamp: August 24, 2017, 12:55:58 pm
content: Something from the PEM nut range?http://www.pemnet.com/fastening-products/fasteners-for-mounting-into-printed-circuit-boards-2/

author: daqq
author_rank: Super Contributor
timestamp: August 24, 2017, 03:47:55 pm
content: One more vote for the Keystone screw terminals. I used them once for the application you are describing, worked great!

author: FivePoint03
author_rank: Regular Contributor
timestamp: August 24, 2017, 04:05:08 pm
content: Quote from: daqq on August 24, 2017, 03:47:55 pmThe Keystone parts are 7.90mm which exceeds the requirement of being 5.8mm or less. They are great parts though.I had a very similar requirement to this not so long ago - I spent a long time looking and was not able to find anything suitable. Please post back here if you do!