hybridfree/eevblog-posts huggingface dataset:
easiest way to reproduce pinout of one board on another board (Eagle) - Page 1
Forum section: electronics / general

author: djacobow
author_rank: Super Contributor
timestamp: January 18, 2014, 05:31:57 pm
content: This may be a dumb question, maybe belongs in beginnings.I would like to make a "socket" to plug an Arduino Pro Mini into my board. I have the Eagle files for the Pro Mini. Assuming I populate it with male headers pointing "down," I want to make a footprint on my board for female headers to accept those pins. How is this best done, other than just placing pins in the right locations?Edit: whoops. This should have been on the Eagle forum, but I can't move my own post.

author: MatCat
author_rank: Frequent Contributor
timestamp: January 18, 2014, 05:34:51 pm
content: The main thing is really just to make sure your pin-spacing is proper, so just using a standard 2.54mm pin spacing will work for you. If you have an eagle file for the pro-mini you could just copy and paste the footprint, doesn't matter if it's male or female top or bottom, a through hole is the same either way unless your 3D modeling it.

author: djacobow
author_rank: Super Contributor
timestamp: January 18, 2014, 10:25:40 pm
content: Thanks!

author: westfw
author_rank: Super Contributor
timestamp: January 19, 2014, 07:05:51 am
content: For something like a pro-mini, with pretty standard spacing, I'd just create a component an pay a bit of attention. For things with weird spacing, being able to type in numeric coordinates for the destination of a "move" is handy. For complex weird things, you can start with the existing board and delete all the irrelevant components...

author: djacobow
author_rank: Super Contributor
timestamp: February 14, 2014, 12:32:17 am
content: Just a followup -- this worked fine. I made a footprint for the Pro Mini and it went in no problem.
Adding notes to Board Outline Layer - Page 1
Forum section: electronics / general

author: AdamSparky
author_rank: Newbie
timestamp: April 02, 2014, 04:46:34 am
content: I want to add notes to the Board Outline layer to let the PCB Fab (SeeedStudio) know the exact size of cutouts. I have added text in the Board Outline layer in Diptrace (purple text), but when I export to Gerber the text isn't visible only the board outline and cutouts.Is there a special way to add notes to the gerber files?

author: kikib
author_rank: Contributor
timestamp: April 02, 2014, 05:33:10 am
content: Normally when I send the PCB/gerber files to get manufactured I'd include a text document that states exact manufacturing requirements. However sometimes I add notes on a mechanical layer (Mechanical 1 etc in Altium) to specify any specific requirements.Why do you need to specify "exact size of cutouts" when that is what the board outline in Diptrace is exactly for. Do you have special requirements for the cutouts?

author: AdamSparky
author_rank: Newbie
timestamp: April 02, 2014, 06:04:03 am
content: I wasn't sure if the board outlines were boundary lines of the cutout or the path for the router bit, if the latter I would need to allow for the router bit size. Seeed just said to specify the size.

author: kikib
author_rank: Contributor
timestamp: April 02, 2014, 02:58:34 pm
content: Generally you design the PCB exactly how you want it to look like including the board outline. Then it is up to the manufacturer to do the board to that specification. Obviously you need to be mindful of practical drill sizes for vias and pads/holes and internal board cutouts as some dimensions may not be possible.Also make sure that your track widths and clearance adheres to the minimum requirements set out by the PCB manufacturer. Typically most good ones will allow 6mil for widths and 6mil for clearance, however it's better to go a bit bigger so as to allow for a bit of tolerance.

author: Falcon69
author_rank: Super Contributor
timestamp: April 02, 2014, 04:43:49 pm
content: You can always use the snipping tool in windows and copy/save the image that has the writing on it. Send it in an email to them along with your gerber files. That is what I usually do.
[VIDEO] Different methods to cut circuit board PCB material at home - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: February 05, 2014, 06:55:48 am
content: Credit goes to Alan (w2aew)

author: ThunderSqueak
author_rank: Unknown
timestamp: February 05, 2014, 07:13:54 am
content: I have always just used a large heavy duty paper cutter

author: scientist
author_rank: Frequent Contributor
timestamp: February 07, 2014, 08:42:25 pm
content: I usually just razor score it on both sides with a clamp and steel straightedge and then snap it at the score. Pretty easy and clean, and no spiderweb cracking.

author: Dago
author_rank: Frequent Contributor
timestamp: February 11, 2014, 12:15:40 pm
content: I have one of these (http://www.proxxontools.com/store/pc/viewPrd.asp?idproduct=60):I've been quite happy. The guide thingie is kinda shit though, I'd need to replace it with a real linear rail or something though. Currently it has like lots of gap.

author: Barryg41
author_rank: Contributor
timestamp: February 12, 2014, 07:15:48 am
content: I use a small table top band saw for glass with a diamond bandsaw blade. Works good!

author: Refrigerator
author_rank: Super Contributor
timestamp: March 17, 2014, 07:33:51 pm
content: I just use a small hand-held jigsaw.

author: uwezi
author_rank: Unknown
timestamp: March 17, 2014, 08:49:10 pm
content: I do the scoring and snapping method most of the time, when it comes to cutting out edges or other shapes I use the jigsaw.
Subtracting the soldermask layer from the silkscreen layer in gerber files - Page 1
Forum section: electronics / general

author: mondalaci
author_rank: Contributor
timestamp: October 12, 2011, 08:23:07 am
content: Hi guys,I've generated gerber outputs for my PCBs and realized that there are lots of areas where the exposed copper is covered by silkscreen, potentially preventing solderability. I know that some fabrication houses automatically subtract the (inverted) soldermask layer from the silkscreen layer but many don't and I'd like to have a general solution to this problem.http://sourceforge.net/tracker/?func=detail&atid=409541&aid=3386121&group_id=33921suggests that this feature has already been requested for gerbv and Gerbtool already has this feature but the latter seems to be very complicated and I'm clueless how to do layer subtraction.(Please don't suggest me to include less layers upon generating my gerber files because there are some layers that are very useful and I want them all to be included.)Thanks in advance!Laci

author: mondalaci
author_rank: Contributor
timestamp: October 12, 2011, 12:05:29 pm
content: I'm using Eagle. Couldn't see any such warnings.

author: fgsantos7
author_rank: Newbie
timestamp: January 15, 2014, 12:19:03 pm
content: Is there any program that can invert the a gerber file?In my case I want to invert the silkscreen gerber file, but I can't do it already in my PCB design tool (PADS).Does anyone have done it already?Thanks,

author: lorth
author_rank: Contributor
timestamp: January 15, 2014, 04:13:27 pm
content: Quote from: mondalaci on October 12, 2011, 08:23:07 amNot sure if I fully understand your problem. Since you have access to the original PCB layers, why don't you move the Silk there? Put a rule in your EDA's DRC that doesn't allow silk on exposed cooper.

author: mondalaci
author_rank: Contributor
timestamp: January 16, 2014, 10:30:27 pm
content: lorth, Please note that I asked this question 3 years ago when I was a 100% electronics n00b.Since then I moved from Eagle to KiCad which has an automatic silkscreen clipping feature that takes care of this kind of stuff.

author: lorth
author_rank: Contributor
timestamp: January 16, 2014, 10:50:09 pm
content: hahaha I didn't see the time on that post! hahaha

author: eliocor
author_rank: Unknown
timestamp: January 17, 2014, 01:53:36 am
content: Quote from: fgsantos7 on January 15, 2014, 12:19:03 pmYou can simply:- open your generated gerber file with a text editor- search for the string%IPPOS*%- replace%IPPOS*%with%IPNEG*%- save your file

author: kanurys
author_rank: Contributor
timestamp: January 20, 2014, 05:30:08 pm
content: Do you mean to have the solder-mask removed over copper so text is shown in copper, kind of like a solder-mask keepout to form text? I'm not sure I fully understand the goal yet.
6 layer stackup, 4mil trace - Page 1
Forum section: electronics / general

author: EPC-EPDAC
author_rank: Newbie
timestamp: January 08, 2014, 03:16:54 pm
content: I'm looking for stack up recommendations (keeping in mind readily available materials) for a 6 layer board I'm working on.Design requirements dictate the following:- maximum 6 layers- lots of high speed traces DDR3, SERDES, Gbit ETH, USB2.0 etc- high speed signals due to BGA and space limitations need to be ~4mils wideSo for 50/100Ohm with 4mil traces, the two inner signal layers need to be close to the ground and VCC planes (about 6 mils), this results in a total stack up of only 35mils assuming 4.3mil outer cores and 8 mil center core. So either I have a "thin" PCB at 35 mils or increase the center core to 35 mils or so and that will hurt the inter-plane capacitance.So is a less than nominal 63 mil board a bad idea (perhaps to much board flex?) or do the advantages of more inter-plane capacitance outweigh a thin board?Any 50 Ohm, 4 mil trace, 6 layer stack up suggestions are welcome

author: nctnico
author_rank: Super Contributor
timestamp: January 08, 2014, 06:49:32 pm
content: I wouldn't bother with matched impedances to memory. Usually the impedance of memory can adjusted and it isn't very cricital when traces are short (follow the PCB routing instructions). For a 6 layer board I usually have:signal1groundpower1 (copper pours)signal2power2 (copper pours)signal3This gives you the signal1 and signal3 layers for matched impedance traces (edit: signal2 should have been signal3).

author: TommyGunn
author_rank: Contributor
timestamp: January 12, 2014, 09:45:22 pm
content: This is a very good write up on layer stackups. He covers most advantages and disadvantages for different stackups.http://www.hottconsultants.com/tips.htmlHere is the part on 6 layers but i would suggest reading his whole PCB stackup guide.http://www.hottconsultants.com/techtips/pcb-stack-up-3.html
Ultra Librarian - Accelerated Designs - Page 1
Forum section: electronics / general

author: Poe
author_rank: Frequent Contributor
timestamp: January 09, 2014, 07:23:46 pm
content: Just tried to get some symbols and footprints from Microchip's website. They had me download this Ultra Librarian program to convert their proprietary format into one my EDA tool (Altium) could handle. Bit of a pain in the ass, I can't see why they don't just do it on their (Microchip server) side.Anyway, does anyone have experience using the free and/or paid version of this program?http://www.accelerated-designs.com/

author: marshallh
author_rank: Unknown
timestamp: January 09, 2014, 07:43:49 pm
content: Ultra Librarian is such crap. The altium export failed to work properly, and after manually editing the generated vbscript (yes that's how it "works") I got it imported.Don't even bother, just make the package yourself. Save time in the end

author: Gribo
author_rank: Frequent Contributor
timestamp: January 09, 2014, 09:07:38 pm
content: I had good experience importing some TI components into Altium. However, the imported strings are just that, so instead of the actual designator, you get just a RefDes string. Also, some vendors tend to cram tons of useless properties for no obvious reason, and some have too few properties (TI and Microchip respectively).

author: Poe
author_rank: Frequent Contributor
timestamp: January 10, 2014, 07:01:33 pm
content: Thanks for the feedback. Just getting the symbols and footprints for the Microchip parts was a real pain using this software. Is it proprietary or are there easier programs I could use?
Ground pour under integrated magnetics RJ45 - Page 1
Forum section: electronics / general

author: EPC-EPDAC
author_rank: Newbie
timestamp: January 07, 2014, 09:32:42 am
content: Can anyone offer advice regarding PCB layout of the signal ground and chassis ground under and in the vicinity of an integrated RJ45 with magnetics (dual 10/100/100 ETHERNET)This is a 6 layer board.In the past (without integrated magnetics) I would pour chassis ground under the RJ45 up to the PHY side of the separate magnetics, and signal ground under the remainder of the board up to the MAC side of the magnetics, with a void in between the signal and chassis planes under the discrete transformer. I'm not sure what best practices are when using an integrated magnetics module.

author: SeanB
author_rank: Super Contributor
timestamp: January 07, 2014, 02:18:27 pm
content: The magnetics on the socket should be shielded, but refer to the manufacturers appnotes to see. Best is probably to leave the pcb there bare so that if you change to one with poor magnetic shielding on the bottom it will not matter.

author: free_electron
author_rank: Super Contributor
timestamp: January 07, 2014, 02:57:32 pm
content: Your split is still valid.The magnetics in the can are shielded by the can (the can is iron)As long as you maintain the chassis ground an system ground split and then couple them in 1 point through the classic ferrite//cap co struction you are ok.

author: EPC-EPDAC
author_rank: Newbie
timestamp: January 08, 2014, 08:32:50 am
content: Thank you, the visit to the EMI lab will be interesting.
Gerber File question - Page 1
Forum section: electronics / general

author: glicos
author_rank: Regular Contributor
timestamp: January 08, 2014, 01:47:07 am
content: Anyone esp expert in PCB design. Is there a way or software that can be used to determine what PCB software package is used to generate a gerber file? I'm having in inquiry from PCB fab asking me if i can tell them what software is used to generate the gerber i forwarded to them which in turn came from our customer. Our customer have no idea also since it was only given to them by their counterpart in US.Appreciate any response from expert here and thanks...

author: madworm
author_rank: Frequent Contributor
timestamp: January 08, 2014, 02:55:08 am
content: There might be a comment line in the gerber files.Something like this:Code:%FSLAX34Y34*%G04 Gerber Fmt 3.4, Leading zero omitted, Abs format*G04 (created by PCBNEW (2013-10-14 BZR 4386)-product) date Tue 15 Oct 2013 01:07:32 AM CEST*%MOIN*%
Software for handling BOMs / Product Lifecycle management - Page 1
Forum section: electronics / general

author: hutsch
author_rank: Newbie
timestamp: February 01, 2012, 03:26:22 pm
content: Hi all!I'm currently searching for a software for a more sophisticated way of handling the bill of materials (BOM) lists of our products (pcb assemblies and complete products).At the moment I handle everything with Openoffice spreadsheets. Well, it works but is somehow not very professional and error prone. Not to mention the versioning/revision/fork problems.Is there anybody out there that uses affordable or maybe opensource software for this? I know there are full-blown ERP/CRM solutions out there but they somehow seem to me a little overkill and mostly the BOM styles do not take account of some electronics needs (columns for symbol, case, manufacturer, manuf.part...)Well, i know that it is possible to export BOMs from EDA-Tools like Eagle but i don't want to have the bare electronic parts but also all other things related to product like assembly workload, lables, cases, manuals. Revision handling would also be nice.Any ideas?Somebody using xTuple, EleLa, OpenBravo, OpenERP?Heiko

author: amspire
author_rank: Super Contributor
timestamp: February 04, 2012, 06:26:11 am
content: Love OpenERP.OpenBRAVO starts of looking fabulous, but when you have to start modifying it from standard, that is where I think OpenERP is amazing, and OpenBravo is a nightmare. Open ERP has a great opensource community, and you can actually do quite a lot of table modification, field editing in forms, and data logic without touching programming language at all.Never heard of EleLa. I did look at xTuple ages ago. I probably rejected them as you have to run a GUI client. I tend to reject any DB package that doesn't have a great web page client. Also, I am not sure how good the open source xTuple is compared to the commercial version.Richard

author: vpapanik
author_rank: Newbie
timestamp: January 06, 2014, 02:20:47 pm
content: Check this post.http://vpapanik.blogspot.gr/2013/12/for-better-bom-in-excel.html

author: GeoffS
author_rank: Unknown
timestamp: January 06, 2014, 02:30:40 pm
content: You did notice that this is a 2 year old thread?

author: reagle
author_rank: Unknown
timestamp: January 06, 2014, 03:27:44 pm
content: Trywww.aligni.comWe ended up settling on that after looking for a while. It has its quirks but handles most of the things we need relatively inexpensively.They also have a free version for open source projects

author: Unknown
author_rank: Unknown
timestamp: January 06, 2014, 05:22:00 pm
content: Quote from: GeoffS on January 06, 2014, 02:30:40 pmUnlikely that a spammer would be all that bothered tbh.

author: Spikee
author_rank: Frequent Contributor
timestamp: January 06, 2014, 11:52:11 pm
content: Quote from: Lurch on January 06, 2014, 05:22:00 pmIt is still relevant information , maybe not for OP by there are a lot of other people here.Who may find this topic by google or eevblog search.
Cheap light table for artwork retouching etc - Page 1
Forum section: electronics / general

author: Kremmen
author_rank: Super Contributor
timestamp: January 04, 2014, 10:01:44 am
content: Just thought to mention this since i haven't seen it discussed anywhere in this forum.A very cheap light table: your laptop (of course provided you already have one). Just run an app like say notepad and max it to get a nice evenly lit surface for retouching films and whatnot. Works for actual camera films as well, of course.And yes, i know the chinese make PCBs cheap. That's not the point.
changes to design for ESD awareness - Page 1
Forum section: electronics / general

author: edmundopt
author_rank: Regular Contributor
timestamp: December 12, 2013, 04:15:31 pm
content: HelloI have made a design of a board, this board receives 4 inputs from a 12volts DC power supply connected to microswitches.Those inputs go through an optocoupler, then through a schmitt inverter and into a 5 volts powered microcontroler.Those microswitches are far away, 4/5meters and cables go near AC motor.This PCB is inside a "do not open" metal case connected to mains ground.I have been reading some documents about ESD, some sugest a ground plane connected with a 2kv CAP, with a .5inches gap between the 12power supply and mains ground, can you guys bring some insight about this.How can ESD be applied to this PCB, sugestions ?

author: mike_la_jolla
author_rank: Newbie
timestamp: December 17, 2013, 01:02:37 am
content: How are you mounting the PCB in the metal case? I don't see the holes.

author: edmundopt
author_rank: Regular Contributor
timestamp: December 17, 2013, 10:58:57 am
content: At the moment I generated the graphics, the layers were not correct, here is the correct version:This board is fixed into a DIN rail , with plastic fixing, so there's no grounding of the board.The question is, should I make a Ground plane near the inputs and connect it through a 2kv cap to mains gnd ?Or should I leave the board as it is, because it's inside a metal box that is grounded?

author: JuKu
author_rank: Frequent Contributor
timestamp: December 17, 2013, 12:07:47 pm
content: You have optocouplers and if I understood right, the other connections are static. You are set, just don't compromize the isolation barrier. If U1 is the isolator, move D1 further away from the mounting hole.

author: edmundopt
author_rank: Regular Contributor
timestamp: December 18, 2013, 12:33:27 pm
content: ok, so I must respect a gap between the "non isolated" part of pcb, and the isolated part.the wholes have a plastic tension object to fix, and the board edge is not printed on the PCB. Anyway, I have done some changes concerning your notes.This is the final version (revised schematic)
LTSpice rise/fall time on a Behavioral Voltage Source. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: December 30, 2013, 03:37:31 pm
content: Lets suppose that I have a Behavioral Voltage Source in LTSpice with the following equation.V=if(V(V1)>V(V2),5,0)It will toggle the voltage between 0 and 5 volts according to V1 and V2. Can I put arise/fall timeto the Behavioral Voltage Source?Alexander.
eda for my requirements - Page 1
Forum section: electronics / general

author: ant17
author_rank: Regular Contributor
timestamp: December 25, 2013, 11:36:45 pm
content: hi guys i have been looking at every eda / pcb software around and its literally mind boggling i have a set of requirements i would like to have in the so called perfect softwarefull 3d board clearance checking, andgood mixed signal pspice that is capable of show voltages all around the the circuittools for embedded design such as c compilerthermal and magnetic simulation andbe able to do good signal integrity checkseasy to get partsif anyone knows of software that is capable of that and is good software i would appreciate it and merry christmas

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 26, 2013, 10:25:22 am
content: whats your budget? if its 5 or 6 figures then it will be not so hard to give a suggestion.

author: Balaur
author_rank: Unknown
timestamp: December 26, 2013, 05:44:07 pm
content: Quote from: Mechatrommer on December 26, 2013, 10:25:22 amNot only that, but anyone who is able to correctly use all the listed features will also require a 6 figure salary in the currency of your choice.

author: ant17
author_rank: Regular Contributor
timestamp: December 26, 2013, 11:13:33 pm
content: up to about $10000

author: lorth
author_rank: Contributor
timestamp: December 29, 2013, 12:11:37 am
content: Cadence Allegro.
Anyone using version 5? - Page 1
Forum section: electronics / general

author: Fleetz
author_rank: Regular Contributor
timestamp: October 07, 2013, 07:05:30 am
content: Interesting in finding out from those currently using version 5 what their experience are? Stability, any significant improvements from some of the issues that early adopters posted?Seems Dave isn't a fan.....can not see a review have I missed it?Cheers,Fleetz

author: MrsR
author_rank: Regular Contributor
timestamp: October 11, 2013, 10:02:48 pm
content: The Model Source is good. I use it for just about all the components I want.The out put section isn't very good. but the PCB design section is better than Diptrace.Rachael

author: wigman27
author_rank: Regular Contributor
timestamp: December 31, 2013, 11:21:28 am
content: Hi!Very sorry for the delayed reply!! I am using 5.1 now and love it!! I have only used eagle other than designspark and it's no comparison ;-)

author: hiddensoul
author_rank: Regular Contributor
timestamp: December 31, 2013, 11:31:02 am
content: Quote from: Fleetz on October 07, 2013, 07:05:30 amI seem to recall reading on the forum that it isn't that Dave is not a fan but he has used Altium exclusively for so long that he wouldn't be able to do an unbiased reviewBut also my memory may be failing me and I might be blowing it out my arse

author: Monkeh
author_rank: Super Contributor
timestamp: December 31, 2013, 04:43:11 pm
content: Quote from: wigman27 on December 31, 2013, 11:21:28 amIndeed, Eagle can pan across a board without visibly hitching..
mentor graphics expedition flow 7.9.5 - Page 1
Forum section: electronics / general

author: ant17
author_rank: Regular Contributor
timestamp: December 24, 2013, 04:45:02 am
content: hi guys has any one had any experience with mentor expedition flow 7.9.5 good or bad. If so how does it compare to something like altium 14 i know that altium doesn't have tools for modelling temperature flow over a pcb and a few other tools but i would like someone to give me there thoughts
SpaceMouse any good? - Page 1
Forum section: electronics / general

author: ElektroQuark
author_rank: Unknown
timestamp: December 17, 2013, 04:23:27 pm
content: I have no experience with this type of devices.Any advice to share?Any model recommended?It will be used with Altium and Rhinoceros.

author: Rufus
author_rank: Super Contributor
timestamp: December 17, 2013, 04:57:39 pm
content: Quote from: EdoNork on December 17, 2013, 04:23:27 pmFor working in 3D (and assuming support in whatever software you use) you won't know how you managed without one.Altium support is fine.The most basic version will give you 90% of what you want. The wireless version seems pretty much pointless.

author: free_electron
author_rank: Super Contributor
timestamp: December 17, 2013, 06:48:53 pm
content: 3Dconnexion Spacenavigtor 79$i have been using it for 4 years. No drivers needed, no configuration needed. install the spacenavigator software and run. Altium recognises it, rhino recognises it , even word recognises it. ( zoom/pan)Put the navigator left of the keyboard, moure right of the keyboard.The navigator is so addictive that you frequently curse at programs that dont work with it !In altium you use the navigator to dynamically zoom and pan while you are routing. so you use both navigator and mouse simultaneously. it is extremely fluid (if you have a decent graphics card with lots of ram)All my computers at home have one connected, i even keep one in my laptop bag. Same at work.I simply can't live without that thing.It also works in Solidworks , everything from Autodesk, and many other 3d tools.This thing is a direct descendent from the space navigator that silicon graphics had , so all that hi-end 3d software supports the protocol natively. Fro software that does not support 3D the 3dx software provides a transition layer . so you can pan/zoom in acrobat, google earth and lots of other programs.This thing does not use the same command pipe like a mouse. it is really a specific 3d command pipe , similar to the mouse command pipe , that programs can hook into. it is a standardized API specifically for 3D work.Only those programs not understanding this command pipe need the translation layer.

author: marshallh
author_rank: Unknown
timestamp: December 17, 2013, 09:22:00 pm
content: Quote from: free_electron on December 17, 2013, 06:48:53 pmOk you sold me. I'll post up once I route a board with it

author: ElektroQuark
author_rank: Unknown
timestamp: December 18, 2013, 06:17:45 am
content: 99€ here. Oh well... I love Europe
Signal traces under 125MHz MEMs oscillator - Page 1
Forum section: electronics / general

author: EPC-EPDAC
author_rank: Newbie
timestamp: November 21, 2013, 04:33:44 pm
content: 6 layer board with QorIQ processor, and 3 10/100/1000BASE-T PHYsQorIQ requires a 125MHz clk when using a RGMII interface. I plan to use a fairly small (2.5 x 2mm) MEMS oscillator and can place it very close to the clk input pin, however numerous other high speed signals that are routed on mid layers will have to pass under the oscillator.From a functional and EMI perspective am I better to get the oscillator close ~ 1cm from destination pin (with other signals below but on the other side of a solid ground plane) or place it say 5cm away where no other signals will have to run under the oscillator?Thanks in advance

author: jahonen
author_rank: Super Contributor
timestamp: November 22, 2013, 09:13:06 am
content: I think either way will work just fine. Of course if you have longer trace, then termination and crosstalk issues becomes more critical, but I assume you know how to handle those. Having a ground plane in next layer means that you already have a leg upRegards,Janne

author: nctnico
author_rank: Super Contributor
timestamp: November 23, 2013, 04:36:20 pm
content: Using a 33 Ohm series resistor in the clock signal is a good idea either way.

author: AndyC_772
author_rank: Super Contributor
timestamp: November 23, 2013, 07:15:53 pm
content: If you can get it within 1cm of the processor, put it there and route the clock straight from one to the other. A trace that short just doesn't have the length to radiate or pick up interference to any significant extent. Make sure there's a continuous, unbroken ground plane on a layer adjacent to the clock trace and it'll work fine.FYI, Gbit Ethernet is often very noisy in terms of radiated EMI, so you may well see harmonics of 125 MHz when you go emissions testing - but it won't be directly due to this crystal or its connection to the processor. Expect to need shielded RJ45 cables, and pay close attention to the grounding around your Ethernet PHY.

author: EPC-EPDAC
author_rank: Newbie
timestamp: November 26, 2013, 02:47:34 am
content: Thanks for your comments.
open source schematic editor for documents - Page 1
Forum section: electronics / general

author: kxenos
author_rank: Frequent Contributor
timestamp: November 24, 2013, 10:21:05 pm
content: Does anybody know of any open source schematic editor that can create circuits with the looks of the ones found in books, datasheet etc? My goal is not to create PCBs but to export schematics as images for documents. I would like to have for example the symbols of VSs, CSs, CCVSs, CCCSs, VCVSs, VCCSs, light colours inside transistors, opamps etc.

author: Andy Watson
author_rank: Super Contributor
timestamp: November 24, 2013, 10:46:02 pm
content: Choose a schematic drawing package that can export the diagram, at the quality that you require, as a PDF. Then import the PDF into your document.The only software that I know of is LaTeX and Tikz. The results are good, but, it's a type-setting programme; not a word processor.

author: c4757p
author_rank: Super Contributor
timestamp: November 24, 2013, 10:55:02 pm
content: XCircuit. EPS is the native format, you can directly include that in just about anything.Its output looks pretty good. The one built-in library looks like crap, but there are more under "Libraries" on that website. Take your pick.

author: kxenos
author_rank: Frequent Contributor
timestamp: November 24, 2013, 11:21:44 pm
content: Quote from: c4757p on November 24, 2013, 10:55:02 pmCool! That's excactly what I was looking for! Thanks!I just had a look at scheme-it from digikey.http://www.digikey.com/us/en/mkt/scheme-it.htmlIt's a nice editor (especially since there is the embedded BOM) but not suitable for my needs.

author: c4757p
author_rank: Super Contributor
timestamp: November 24, 2013, 11:26:16 pm
content: Read the tutorials. It's complicated to figure out without them (or at least, it will be very cumbersome until you see how they want you to use it).

author: ohmineer
author_rank: Contributor
timestamp: November 25, 2013, 06:53:19 pm
content: As you mention, scheme-it is cool for the task that you are describing.You may also want to look athttp://www.docircuits.com/andhttps://www.circuitlab.com/just to see whether they fit better to your requirements.

author: awallin
author_rank: Frequent Contributor
timestamp: November 25, 2013, 07:05:25 pm
content: Quote from: c4757p on November 24, 2013, 10:55:02 pmAsymptote is a similar language, maybe more general purpose than xcircuit. I'm not surf if there's a ready-made electronics schematic library for it.http://asymptote.sourceforge.net/gallery/
Do You Use Design Spark Mechanical? Are you inventive enough to beat the best? - Page 1
Forum section: electronics / general

author: DesignSparkMechanical
author_rank: Newbie
timestamp: November 15, 2013, 08:32:08 pm
content: We know that engineers are superheroes at heart, just wanting to make the world a better place through invention. If this rings a bell, RS Components want you to enter their Design Challenge using their new 3D CAD Software Design Spark Mechanical (free, easy to download & fast iteration between other programmes).The aim of the challenge is to urge all engineers to road test DesignSpark Mechanical and take bring those life changing 2D sketches into printable prototypes The most popular design, as voted for by the DesignSpark engineering community, will be transformed into a physical prototype using a 3D printer, and presented to the winning engineer along with the top prize of £5,000. Two runners-up will each receive a prize of £2,500.To take part in the challenge, participants need to simply download the free DesignSpark Mechanical software fromwww.designspark.com/mechanical, create a 3D representation of their design, and submit the final idea by uploading it to DesignShare, the collaborative project space on DesignSpark.com, where each idea will be posted and votes will be cast. All entries must be received by 17:00 GMT on November 22, 2013. To enter simply click herehttp://bit.ly/1b2tb9O
A look at OurPCB boards - Page 1
Forum section: electronics / general

author: Aismass
author_rank: Newbie
timestamp: November 15, 2013, 07:52:05 pm
content: Hey all:I recently got some boards made by OurPCB(.com) and thought I'd share my experience since I couldn't find many detailed reviews on them myself. I ordered 2 different PCBs from them (one of which had 3 sub-boards on it) for a total cost of just under 320 USD all-in. One board was fairly large at 150x182mm (4 copies) and the other was 90x56mm (10 copies). Not exactly cheap but the fact that I had 3 boards in one might have added a lot to the 'tooling' cost; 160 + 6.25/board vs. 80 + 1.25/board for the small ones.Overall the quality is really quite good, especially on the large board. I have used Seeedstudio once in the past and I would definitely rate this as being better quality. Really happy with the way the large boards came out. The smaller boards were not as sharp looking and the silkscreen was a bit sloppy here and there but overall still good. They also included a 4 page inspection report for each board with various measured parameters taken from extra boards of the same run I assume. This is only the second fab I've used so I have no idea if this is standard precude but I thought it was neat.Pics are attached (excuse the crappy camera). I did notice one odd thing on the back of a few boards - some black residue or something between copper pours. I have no idea what it is but the copper feels noticeably thicker in these areas so maybe it has something to do with the etching?
Are You Inventive Enough? Design Spark Mechanical Competition Ends This Week - Page 1
Forum section: electronics / general

author: DesignSparkMechanical
author_rank: Newbie
timestamp: November 15, 2013, 08:19:17 pm
content: We know that engineers are superheroes at heart, just wanting to make the world a better place through invention. If this rings a bell, RS Components want you to enter their Design Challenge using their new 3D CAD Software Design Spark Mechanical (free, easy to download & fast iteration between other programmes).The aim of the challenge is to urge all engineers to road test DesignSpark Mechanical and take bring those life changine 2D sketches into printable prototypes The most popular design, as voted for by the DesignSpark engineering community, will be transformed into a physical prototype using a 3D printer, and presented to the winning engineer along with the top prize of £5,000. Two runners-up will each receive a prize of £2,500.To take part in the challenge, participants need to simply download the free DesignSpark Mechanical software fromwww.designspark.com/mechanical, create a 3D representation of their design, and submit the final idea by uploading it to DesignShare, the collaborative project space on DesignSpark.com, where each idea will be posted and votes will be cast. All entries must be received by 17:00 GMT on November 22, 2013. To enter simply click herehttp://bit.ly/1b2tb9O
Searching for an old OrCAD Netlister  - Page 1
Forum section: electronics / general

author: GeorgeHahn
author_rank: Contributor
timestamp: October 31, 2013, 08:56:39 am
content: About two years ago, I came across an OrCAD netlister for PADS. It was written in an older version of VB4. I found it on a small forum and have not been able to relocate it. If memory serves, it was just a single DLL.It was nice because it worked perfectly with modern versions of PADS and was quite flexible with the data it allowed to be inserted into the netlist.Familiar to anyone?
Shortcuts - Standard vs Custom - Page 1
Forum section: electronics / general

author: fitracer
author_rank: Newbie
timestamp: October 23, 2013, 02:02:59 pm
content: Our design group is debating whether to stick with standard shortcuts or allow customization by each user. Each direction has merits, but would like feedback on pitfalls -either way - that others have experienced. Thanks.

author: Mattylad
author_rank: Regular Contributor
timestamp: October 23, 2013, 10:04:06 pm
content: I think first, you would have to explain what the heck you are talking about?Shortcuts?I take a shortcut to work, nipping through an housing estate or a shortcut from the desktop tp run a program? or a hotkey in a package?

author: kizzap
author_rank: Unknown
timestamp: October 23, 2013, 11:24:53 pm
content: I'm guessing you are talking keyboard shortcuts.I'd personally suggest keeping them standard across the company, as if you need to train staff you don't have to go about setting themselves up with a custom set of shortcut keys. This would be extremely important if these shortcuts are on an expensive, custom machine.-kizzap

author: fitracer
author_rank: Newbie
timestamp: October 24, 2013, 03:47:21 pm
content: Thanks. Your feedback was helpful.
Moving component on Altium designer - Page 1
Forum section: electronics / general

author: yoko
author_rank: Newbie
timestamp: October 15, 2013, 05:35:35 pm
content: Hi there,On Altium Designer ( PCB editor ) Sometimes we want to move component and we want the track follow the component, How to do that ? This tips can save many time.Thank's.

author: David_AVD
author_rank: Super Contributor
timestamp: October 15, 2013, 08:27:00 pm
content: You can set an option to "drag connected tracks". It's in Preferences > PCB Editor > General > Other > Comp Drag.

author: yoko
author_rank: Newbie
timestamp: October 15, 2013, 08:46:50 pm
content: Ok I have set this option but nothing change, always the component is moved without the track. No idea why ?

author: tszaboo
author_rank: Super Contributor
timestamp: October 15, 2013, 09:13:17 pm
content: After that, you still have to use the "move" menu for it. "M" "C" should do it. Hovewer, the results are ridiculous, it completely ignores 45/90 degree, and you are better if you just delete the whole section and redraw it. It is a weak point.But hey, we have a useless embedded section!

author: yoko
author_rank: Newbie
timestamp: October 15, 2013, 09:20:15 pm
content: Ok now it work. For the weak point I expected that. Thank's.

author: Nerull
author_rank: Frequent Contributor
timestamp: October 20, 2013, 04:17:47 pm
content: Hold down control while dragging. Sometimes it works, sometimes it just makes a mess.

author: David_AVD
author_rank: Super Contributor
timestamp: October 20, 2013, 08:46:37 pm
content: Quote from: Nerull on October 20, 2013, 04:17:47 pmHolding down CTRL while (left) dragging a component doesn't have any (added) effect when I try it.
Export gerber files from Altium 13 - Page 1
Forum section: electronics / general

author: kristen Ha
author_rank: Newbie
timestamp: October 20, 2013, 08:48:09 am
content: Need help on exporting gerber files from Altium 13. When click on the fabrication of output> gerber files , selecting the bottom layer. Do i need to click to " mirror" the bottom layer ?And how come my bottom layer tends to appear as red and not blue when it is exported ?
ctrl c and ctrl v on Altium dont work - Page 1
Forum section: electronics / general

author: Erjon
author_rank: Newbie
timestamp: October 01, 2013, 12:34:36 pm
content: Hi there,Does anyone know why my ctrl c & ctrl v on altium don't work?They do work on the schematic but not on the PCB environment.any idea? thanks in advance.

author: David_AVD
author_rank: Super Contributor
timestamp: October 01, 2013, 12:46:39 pm
content: Ummm... what version ?You are choosing an origin when you do the copy aren't you?Works for me BTW.

author: free_electron
author_rank: Super Contributor
timestamp: October 01, 2013, 02:39:24 pm
content: Ec epEdit-copyEdit-pasteThose are the shortcuts

author: tszaboo
author_rank: Super Contributor
timestamp: October 01, 2013, 02:47:23 pm
content: Of course it works. You press Ctrl+C you click with your mouse for a reference point for the copy, then you press Ctrl+V to insert it, and click to place it. Not obvious, but it tells you top left.

author: free_electron
author_rank: Super Contributor
timestamp: October 01, 2013, 02:56:38 pm
content: Ah yes, of course. You need to pick an origin point for those operations !
PCB 101 - Page 1
Forum section: electronics / general

author: johnallen76
author_rank: Newbie
timestamp: March 14, 2013, 07:50:47 pm
content: I'm new to PCB design - Student at the UniversityI plan to build a Spartan 6 board for my final projectI'm guessing this might turn into a 6, 8 or 10 layer boardI need help in understanding what drill size to use.What are the most common sizes used and why.signal viapower viamounting holesfor4mil/4mil designs5/5 deisgns8/8 designs

author: marshallh
author_rank: Unknown
timestamp: March 14, 2013, 08:38:05 pm
content: Practical lower limit for mechanical drills is about 12mil. It is possible to go smaller with classic bits, but breakage is an issue and it's expensive.With a 12/13mil drill and a modest annular ring you should be break out 1mm BGAs. 6/6 is really the biggest you could get away with. 5/5 is better.For mounting i use a 3/8 plated drill but this depends on what you'll be using it for.What you really need to do is to get your hands on some high end PCBs and study them.

author: John steave
author_rank: Newbie
timestamp: September 30, 2013, 04:45:45 pm
content: For your kind attention I am telling you to build your knowledge about PCB because you just try to build project upon PCB. That's well and good, there are plenty of places where you try to solve your problem.I’m not recommending but perhaps you could check out thisPCB

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 30, 2013, 05:04:12 pm
content: Quote from: johnallen76 on March 14, 2013, 07:50:47 pmIn which case I strongly suggest you base it around a devboard or ready-made module. This is not the sort of thing to start learning PCB layout with
Help needed! - Page 1
Forum section: electronics / general

author: some1
author_rank: Newbie
timestamp: October 26, 2013, 02:45:25 pm
content: Hello EEV forum just registeredstraight into the problem: i have a li-ion battery (made for an ipod-touch 4) with out the outer shell..When i tried to solder it to the ipod's motherboard one the connections on the cable went useless...After , i tried to solder another cable from a similar (same) battery on the cell. The cable is connected to a small PCB line witch has from (right to left) 3 real tinny resistors on each road , a puffy resistor , (connection to cell) , a tiny one again along with a "chip" with 3 pins on each side , the second connection , and finally a chip locking like thing with 2 pins on each side.. Now the actuall problem is that last chip witch was burned during soldering and when i cuted it off the pcb everything looked fine on the volt meter. And my question is:Am i able to use the battery on the phone without it , will it have any effects?thanks in advance

author: Simon
author_rank: Unknown
timestamp: October 26, 2013, 06:16:28 pm
content: Please DO NOT double post !
PCB Design Optimization Starts in the CAD Library - Page 1
Forum section: electronics / general

author: hqew2013
author_rank: Newbie
timestamp: November 01, 2013, 07:07:28 am
content: links to copyrighted material removed. User banned

author: tszaboo
author_rank: Super Contributor
timestamp: November 01, 2013, 11:02:27 am
content: Does this have to do anything with the genius Tom Hausherr's Blog? I kinda feel like there are some strange similarities.Tom Hausherr's Blog

author: Bored@Work
author_rank: Super Contributor
timestamp: November 01, 2013, 11:29:02 am
content: Quote from: NANDBlog on November 01, 2013, 11:02:27 amIt even has Hausherr's "PCB Libraries" company logo on it. And since hqew.net is one of those Chinese IC broker I'd say this is a case for the moderators to decide if they want to keep this advertising.As an additional data point, Google says the same advertising has been spammed to other sides, e.g. a C++ forumhttp://www.cplusplus.com/forum/beginner/115411/
Datasheet for "ebay" RJ12 jack - Page 1
Forum section: electronics / general

author: lk
author_rank: Regular Contributor
timestamp: July 30, 2013, 02:45:28 pm
content: Greetings,I know this is a long shot, but the vendor was not very helpful, eg he just listed the general specs again. And im wondering if anyone here knows/has the datasheet for this item, even a model number might help me.http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111131226164The pictures from the different vendors on ebay pretty much look the same, infact any rj12 connector that i can buy cheaply that has a datasheet would work-lk

author: kizzap
author_rank: Unknown
timestamp: July 31, 2013, 12:16:56 pm
content: what exactly are you after? what connections go where, or the board mounting information?2 minute search brought this up:http://au.element14.com/fci/54601-906wplf/cat3-rj12-modular-jack-6pos-1-port/dp/1691891-kizzap

author: lk
author_rank: Regular Contributor
timestamp: July 31, 2013, 01:15:56 pm
content: Hi Kizzap,Ahh, maybe i was not precise, i could of course get the parts from digikey or mouser, but as i don't need anything apart from a few of these connectors, it makes no sense paying 30usd shipping to get them. So i was after the datasheets for the ebay items, or at least from somewhere where the shipping is going to be unreasonable compared to the product i need.-lk

author: aalbri
author_rank: Contributor
timestamp: August 31, 2013, 07:12:19 am
content: Here is a similar one on ebay, not sure if you needed bulk or not though:http://www.ebay.com/itm/TE-CONNECTIVITY-AMP-5555165-1-MODULAR-CONNECTOR-/390614555358?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item5af2711adehttp://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=5555165&DocType=Customer+Drawing&DocLang=English