hybridfree/eevblog-posts huggingface dataset:
Manual Demonstration Circuit for 74HC595 Shift Register - Page 1
Forum section: electronics / general

author: makivic614
author_rank: Newbie
timestamp: July 31, 2017, 09:55:54 am
content: I am trying to create a manual demonstration circuit for a 74HC595(here is thedatesheet of 74HC595) shift register. Se my circuit below. The problem I am having is that I am only getting a +0.7V signal to the data, clock, and latch pins of the 74HC595 when one of the buttons are pushed. The S4 RESET switch works fine (normally high at 5V, press switch to bring down to 0V), however S1, S2, and S3 do not accomplish the reverse scenario (normally LOW, press switch for HIGH) correctly. You will note that I am also trying to debounce the switching with a capacity or resistor. I suspect this debouncing set up is creating my problem.Does anybody have any advice on how to create a debounced normally LOW, momentarily HIGH switch that switches between 0V and 5V?

author: alm
author_rank: Super Contributor
timestamp: July 31, 2017, 10:26:40 am
content: I do not see any circuit?

author: albert22
author_rank: Regular Contributor
timestamp: July 31, 2017, 03:58:33 pm
content: Difficult without seeing the circuit. But probably the problem is with the debouncing circuit. A good one can be made with a pair of nand or nor gates (or even two inverters)Here is onehttp://www.robotroom.com/DebouncedCounter.html
I need help deciphering this card edge connector's datasheet. - Page 1
Forum section: electronics / general

author: MarkS
author_rank: Unknown
timestamp: July 25, 2017, 04:03:06 am
content: I'm trying to create a library in KiCAD for AMP card edge connector 5650090-9.datasheetI need to create the schematic and footprint for both the card edge and the connector.This is a 160 position connector. The issue is with the card edge diagram on page two. Looking at the drawing, I see that there are Y spaces, a notch, and then X spaces. Going back to page one, I see that Y is 37 and X is 41. 41 + 37 x 2 = 156. To make it even more confusing, the "NO OF DUAL POSN" column right next to the X column on page one says 80. 41 + 37 = 78! Where are the four missing connections? While I do not need all of the 160 connections for my project (future expansion), I would like to get this right before I waste money on a board. It looks like the notch would hide four connections easily, but then why sell this as a 160-position connector?I must be reading this wrong!

author: forrestc
author_rank: Unknown
timestamp: July 25, 2017, 04:20:16 am
content: Quote from: MarkS on July 25, 2017, 04:03:06 amThis appears to be a fencepost error. Look it up if you don't know this term....The sheet says 'X spaces', not 'X holes'.If you want to be sure about this, get a connector and count.... but that's my best guess

author: rs20
author_rank: Super Contributor
timestamp: July 25, 2017, 04:22:48 am
content: You have five fingers, but only four gaps between your five fingers.(41 + 1) + (37 + 1) = 80

author: MarkS
author_rank: Unknown
timestamp: July 25, 2017, 04:23:30 am
content: I mistook spaces for positions of the contacts. That makes sense.

author: WastelandTek
author_rank: Frequent Contributor
timestamp: July 25, 2017, 04:42:26 am
content: And I learned a term..."fencepost error" excellent

author: MarkS
author_rank: Unknown
timestamp: July 26, 2017, 07:47:21 am
content: Also known in the programming world as the "Off-by-one error."
Searching for means to ensure positive SMD pad-to-pad contact - Page 1
Forum section: electronics / general

author: rbm
author_rank: Regular Contributor
timestamp: October 09, 2017, 02:27:02 am
content: hi,I'm designing a replacement display module for an existing design and need input on the best means to ensure positive contact between SMD pads on the main card and SMD pads on the display module. The original manufactured module contains an LCD display inside a polycarbonate enclosure which is mechanically screwed to the mainboard. There are flexible pressure contacts on the LCD which mate with SMD pads on the mainboard. The act of screwing down the display module ensure positive electrical contact with the SMD pads.Below is a picture of the original display module and main card. The display module is the polycarbonate unit on the right. Under this module are 8 SMD pads that contact the LCD display.I'm designing a replacement display module with the same mechanical fixture, but I am searching for a means to ensure the positive electrical contact. This might be achieved with a sprung brellium copper terminal or a pogo pin, but I have to keep the height of the display at a minimum. I plan on designing a PCB that will directly contact the main card and have pads that precisely align with the pads on the main card. I know that I have to build up the height of the pad on the display module so that the act of screwing down the module will guarantee positive contact.What is the best means to raise the height of the SMD pad? I've searched through Digikey and found this part:https://www.digikey.ca/product-detail/en/harwin-inc/S70-220102045R/952-3142-6-ND/6211263Will this part work?
Anyone have experience with Keysight's MBP or IC-CAP? - Page 1
Forum section: electronics / general

author: tec5c
author_rank: Frequent Contributor
timestamp: July 16, 2017, 03:14:28 am
content: As the title suggests, I am looking for people who have experience with either package from Keysight, primarily for BSIM3/4 parameter extraction.IC-CAP has a lot of examples but the package seems less intuitive than MBP.I am trying to import some simulated data to act as the measured data and then run a (BSIM) parameter extraction to see if either package can extract the same parameter list as what the simulations were done with. Essentially I am trying to do a verification cycle to see how accurate MBP or IC-CAP are.
WiFi RGB LED Driver - Page 1
Forum section: electronics / general

author: Bootalito
author_rank: Unknown
timestamp: July 18, 2017, 08:15:40 pm
content: I'm designing a RGB LED Driver PCB. I'd love to have someone with more experience than myself take a quick look for glaring mistakes.Functional requirements:1. robust for rough installations (incorrect wiring, rough handling, ESD, etc)2. Robust for back EMF due to long wire rungs3. commonly available parts4. Powerful. Currently the limiting factor is the rating of the 10A terminals (using some quick disconnectshttp://bit.ly/2uwTUhZ)

author: thm_w
author_rank: Super Contributor
timestamp: July 19, 2017, 09:55:36 pm
content: - Whats the purpose of the bidirectional TVS on GPIO13, 14 15? Since the gate driving circuitry is on the PCB, I don't see what is being protected here. It is also bi-directional, you'd typically use unidirectional. Wouldn't it be more benefit on the other side of the FET?- Do you have enough heatsinking to handle 10A, it looks like with those FETs it will be over 5W per device.- If you are clipping POT and GPIO0, then the 3v3 rail may need some clamping.- Is gpio0 serial?- this thread could go in the project section.
Cheap 1.27 mm pitch "edge to ribbon" connector - Page 1
Forum section: electronics / general

author: Skerved
author_rank: Contributor
timestamp: July 11, 2017, 01:56:18 pm
content: I have been trying to find a standard 1.27 mm pitch edge connector for mounting on ribbon cable. But no luck so far.What I am after looks like this, but smaller pitch:I can probably get it custom made, but it needs to be cheap and it feels like one should exist already.Actually,any small pitch "edge to cable" connector is of interest.Do anyone have a clue where to find such connector?Thanks!

author: Gribo
author_rank: Frequent Contributor
timestamp: July 11, 2017, 08:07:15 pm
content: Is it for an existing design or a new design? How reliable do you want it to be? Usually, at this pitch, you see an FFC assembly with a through hole edge connector on a stiffener.

author: Skerved
author_rank: Contributor
timestamp: July 12, 2017, 06:32:51 am
content: Quote from: Gribo on July 11, 2017, 08:07:15 pmIt's a new design. It needs to be reliable, but it will not be re-seated a lot.

author: tycz
author_rank: Regular Contributor
timestamp: July 12, 2017, 07:33:03 am
content: Is a box header or FFC not suitable for some reason?I don't think card edge IDC connectors are a popular way to do wire to board termination these days (it restricts your choice of board finish).

author: DerekG
author_rank: Frequent Contributor
timestamp: July 12, 2017, 09:32:11 am
content: Quote from: tycz on July 12, 2017, 07:33:03 amQuite right. Rectangular circuits that can be V-grooved are the most economical panels to make. Edge connectors mean that you must route the board edge to suit & this costs money. Fine pitch edge connectors are not popular as the quality of the connection relies on the accuracy of the board edge routing, the board thickness, the board solder mask, the quality of the copper track finish & the board etching itself.

author: Skerved
author_rank: Contributor
timestamp: July 13, 2017, 08:47:16 am
content: Quote from: DerekG on July 12, 2017, 09:32:11 amThat seems reasonable. For now I think we will choose another solution. Thanks for the input!

author: DerekG
author_rank: Frequent Contributor
timestamp: July 13, 2017, 10:17:23 am
content: Quote from: Skerved on July 13, 2017, 08:47:16 amThere are lots of options out there, but have a look at the JST connector range (available from Digikey etc) as some of these are very low cost.
Is modified to pure sine wave possible ??? - Page 1
Forum section: electronics / general

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 11, 2017, 03:19:23 pm
content: Hello PeepsI'm looking for a cheap way to change a modified sine wave from my inverter to a pure sine wave to run a fridge freezer in my garage.I found this on ebay 172120985728 but not sure if it's what i need as the English is not to clear.1000W Pure Sine Wave Inverter Power Board Modified Sine Wave Post Amplifier DIYDescriptionFeatures:NOTE : IT IS DIY KIT , not assembledProduct Name: Correction pure sine wave inverter stage plate changeInput voltage: DC380V.Input voltage: AC16V.Output voltage: AC220V.Output frequency: 50 / 60HZ "adjustable."Output waveform: pure sine wave.1000W use the power tube: 4 / 20N60PCB Specifications: 200X85X50MM.Instructions:The product is a modified sine wave inverter modified sine wave inverters, modified sine wave inverter can 1000W / 2000W / 3000W etc ......, change pure sine wave inverter. After the first correction wave inverter stage power tube removed do not, then take a look at a few amendments wave transformer transformer, look at the transformer secondary circuit is a parallel or in series, again plus transformer parameters, modified sine wave transformer secondary is parallel In each of the transformer secondary plus 16 laps. Modified sine wave transformer secondary is a tandem type, in each transformer secondary plus eight laps. Then add the correction wave transformer where a foot of a small voltage transformer empty parameter, this small voltage parameters using a single copper wire 0.6, in which the transformer winding: 5 laps, this small voltage is link AC: 16V position. (Note: Do not open the magnetic transformer plus parameters) transformer parameters After addition, must take modified sine wave inverter voltage capacitors exchange 220UF / 450V, "Remember: modified sine wave inverter high voltage capacitor positive terminal has a feedback resistance, the resistance of a few hundred K, but also for large point of resistance, not voltage does not rise. "Re-energized test voltage capacitors (positive / negative) voltage is DC380V, after the test voltage is normal, use the link line to the plate after the sine wave level, after level panel output voltage: AC220V / 50HZ, output waveform: pure sine wave.Package Included:1pcs 1000W Pure Sine Wave Inverter Power Board Modified Sine Wave Post Amplifier KitsDoes anyone know if this will do the job or have any other idea'sThank you.
Circuit Maker - backing up files locally after release - Page 1
Forum section: electronics / general

author: Warhawk
author_rank: Frequent Contributor
timestamp: July 08, 2017, 02:33:53 pm
content: Hi guys,I am not sure if you are aware but you can download your Circuit Maker files and store them locally when the project is released.The process is described here:https://circuitmaker.com/forum/posts/213465/1That's having said you may have your own copy of design data forever. I was able to open my files in Altium Designer 17 without any problems.It does not change the cloud thing but it is better than nothing.Hope this helps.Regards, Jiri

author: Harvs
author_rank: Super Contributor
timestamp: July 09, 2017, 07:12:39 am
content: I don't use CM, just tried it once. However I noticed all your project docs were locally stored under:C:\ProgramData\Altium\CircuitMaker {some guid}\...So you don't actually have to wait until it's released to take a copy of the PCB and sch files.The problem for me (even for OS designs) was having to commit footprints and sch symbols to open cloud before verifying that they were correct.
Open Source or other free el. part 3D models? - Page 1
Forum section: electronics / general

author: kalel
author_rank: Frequent Contributor
timestamp: July 08, 2017, 04:50:44 am
content: I'm curious if there is a source of free downloadable 3D models of electronic parts.I'm looking to use them only for some rendering experiments (not really designing actual functioning boards), but that's why download-ability is necessary.I assume most standard formats will work fine for the purpose.Since it's only for a little bit of playing around, I would like that they are either free and open source (or public domain or creative commons share-alike or other licenses that allow usage and modification).After a quick search, I did run into at least one website offering parts, but it says "buy membership", so it's not suitable.

author: sleemanj
author_rank: Super Contributor
timestamp: July 08, 2017, 07:35:52 am
content: Grabcad is where I usually look (and have uploaded a few models I made there too), or the manufacturer.

author: Rerouter
author_rank: Super Contributor
timestamp: July 08, 2017, 07:37:29 am
content: if vmrl or step are ok, look for kicad 3d model libraries, there are a number released for free.

author: janekm
author_rank: Unknown
timestamp: July 08, 2017, 10:28:44 am
content: 3dcontentcentral is my go-to but not sure about open source...

author: Mattylad
author_rank: Regular Contributor
timestamp: July 08, 2017, 02:06:11 pm
content: Another vote for 3dcontentcentral.The models are all done for Solidworks but van be downloaded in other formats. Some you may have to import into your own 3D software to fettle them but genreally they are good and all you need to do is register.
eagle measurement backwards - Page 1
Forum section: electronics / general

author: willbanks
author_rank: Contributor
timestamp: June 24, 2017, 07:13:01 pm
content: whenever i try to use the measurment tool in eagle for board design, the numbers are backwards in all directions.attached picture for example. how can i fix this?

author: jpanhalt
author_rank: Super Contributor
timestamp: June 24, 2017, 07:28:35 pm
content: Switch to TOP layer (layer 1)JohnEdit: For the measurement, even if item is on bottomEdit2: Or any layer that is natively top, e.g., info, dimension, and so forth.

author: willbanks
author_rank: Contributor
timestamp: June 24, 2017, 08:40:22 pm
content: thanks!
Need good PCB TEST layout schematic for transparency printer testing? (pdf) - Page 1
Forum section: electronics / general

author: petreza
author_rank: Contributor
timestamp: June 17, 2017, 05:07:03 am
content: Could you point me to a good, detailed pdf file of a test trace layout of a PCB layer. There's a Staples store near me and they haveXerox Color 560 andXerox D95printers, both spec'ed at 2400x2400 resolution. I want to see how small a detail they can print.I am just starting out and do not have a PCB design software yet. I found a few simple ones by googling but maybe someone can point me to something better.Thanks in advance!

author: jwm_
author_rank: Frequent Contributor
timestamp: June 17, 2017, 07:01:45 am
content: A couple test patterns made for the ldgraphy project might suit you. See the PostScript PS fileshttps://github.com/hzeller/ldgraphy/tree/master/img

author: sleemanj
author_rank: Super Contributor
timestamp: June 17, 2017, 07:57:44 am
content: No comment if it's good or not, but I made and used this one a few years back when calibrating a UV boxhttps://github.com/sleemanj/pcb-test-pattern

author: Rerouter
author_rank: Super Contributor
timestamp: June 19, 2017, 08:17:49 am
content: This should be a vector format PDF, 8 mil trace, 6 mil space for the large groups of lines,Have fun.And for completeness sake, attached is an image of a zoomed in area of what a 600 dpi office laser printer can do with this file on plain paper. (HP laserjet 4000) I find it interesting that all the 45 degree corners appear to have almost a complete brake in the trace, and most of the smaller bends become curves.

author: petreza
author_rank: Contributor
timestamp: June 23, 2017, 11:58:32 pm
content: Thank you all for your contributions! Sorry it took me so long to get back to you.I have downloaded the schematics and will print them out when I get the chance.Meanwhile:Quote from: Rerouter on June 19, 2017, 08:17:49 amRerouter, this is a great example. If you have the original schematic, and if it is not too much to ask, can you save the layer to 8.5" X 11" (US Letter) format. This is what the print shop will have and I do not want them to shrink it when printing it. (I do not have Acrobat so I cannot crop it)Thank you so much.

author: Rerouter
author_rank: Super Contributor
timestamp: June 24, 2017, 02:33:19 am
content: Here you go, pdf and svg in a zip file, its a little different than before (Active project), but essential the same
Placement of 90-degree pinheaders - Page 1
Forum section: electronics / general

author: matseng
author_rank: Frequent Contributor
timestamp: June 22, 2017, 09:51:14 am
content: I usually place the headers as J1 but is now wondering if it would be a reasonably good idea to place a 90-degree pinheader a bit in from the pcb edge (J2) in order to have some extra stability from the shroud of the female pinheader. The PCB would probably be less prone of flapping back and forth which is good, but on the other hand any force on the pcb would be transferred to the female connector and possibly damage its connections. (This is for a "motherboard/daughtercards"-like application. )I'm aware that pinheaders are not really a good choice for this kind of usage - but for low cost hobby usage I'm willing to forgo the quality a bit.<a target='_blank' href='https://imgbb.com/'>freepic hosting sites

author: ElektroQuark
author_rank: Unknown
timestamp: June 22, 2017, 10:40:05 am
content: I would put the female version of the header in the motherboard (they could be powered) at board edge level.In the daughterboards, I would put the male header as per your J1.

author: Mattylad
author_rank: Regular Contributor
timestamp: June 22, 2017, 09:32:24 pm
content: Always:If it contains powered pins - it is a female\socket connector.re your pics, it depends what is going to plug into it, consider the ease of insertion\removal, clearances, have you got the free space, does it all fit?

author: jpanhalt
author_rank: Super Contributor
timestamp: June 22, 2017, 09:56:24 pm
content: Quote from: Mattylad on June 22, 2017, 09:32:24 pmIn my house, the "powered" pins (those receiving power) are all male. Powering (those providing power) are female. That is for safety.Is that what you mean?John

author: Mattylad
author_rank: Regular Contributor
timestamp: June 23, 2017, 09:46:50 pm
content: Yes, pins with power on them should be female.As you know, this prevents them being shorted out when the mating connector is not inserted.
OrCAD/Allegro Child Group? - Page 1
Forum section: electronics / general

author: rfbroadband
author_rank: Unknown
timestamp: July 29, 2016, 05:50:37 am
content: I think this was briefly discussed before, but could we add a OrCAD/Allegro Child Group?

author: vzoole
author_rank: Regular Contributor
timestamp: July 29, 2016, 07:59:21 am
content: I vote for it

author: SimonR
author_rank: Regular Contributor
timestamp: July 29, 2016, 10:50:57 am
content: I'm not a fan of OrCad at all but it is one of the most popular tools out there so when I found this site I was suprised that OrCad didn't have its own section. A lot of people here seem to use it.

author: Eternauta
author_rank: Contributor
timestamp: July 29, 2016, 01:06:58 pm
content: A lot of developer still use Orcad and many reference design for complex board use it. I vote YES

author: nctnico
author_rank: Super Contributor
timestamp: July 29, 2016, 08:52:46 pm
content: AFAIK this came up several times already but Dave has choosen not to add a sub group yet.@Dave: please change your mind! We Orcad users want our own place to hang out!

author: ebclr
author_rank: Super Contributor
timestamp: May 07, 2017, 08:40:11 am
content: For those ones that wanna try Orcad still a very decent programhttp://www.orcad.com/buy/try-orcad-for-free

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 16, 2017, 02:23:01 am
content: Allegro is still the 8000 pound mutant gorilla when it comes to PCB, but I find it has some very frustrating basic lacks when it comes to RF design.Might be fun to share tips and tricks.

author: TxAudioguy
author_rank: Newbie
timestamp: June 23, 2017, 02:49:21 am
content: I'd love n Allegro Forum, incredibly powerful tool with one of the worst user experiences I've ever encountered.
Protoboard RF Area - Page 1
Forum section: electronics / general

author: CJay
author_rank: Super Contributor
timestamp: June 22, 2017, 05:46:32 pm
content: This may take a little effort to explain so bear with meI'm designing a protoboard for use with a DDS chip, it's all nice and simple so far but I want to add an area where I can experiment with filters, amps, mixers etc..To that end I want to design in an area of board with a matrix of individual pads on top and a gorund plane underneath. That in itself is simple, but the twist is that I want to have a hole through the pads that's *not* a via to the ground plane so i could solder components to the top pad alone or thru to the ground plane.I can add copper pour to the bottom layer, I can add pads to the top layer but it doesn't fill me with confidence that they'd be drilled or not plated through, how do i check?
PCB History - Page 1
Forum section: electronics / general

author: SimonR
author_rank: Regular Contributor
timestamp: May 23, 2017, 06:58:10 pm
content: Found this video of the Tektronix PCB process from 1969. I thought about posting in general chat but I think its better here. Even for its age its still quite educational. It's amazing how much has changed, but its equally amazing how much is still the same.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 23, 2017, 09:34:02 pm
content: Not only informative; but relaxing to watch.

author: Joel_l
author_rank: Frequent Contributor
timestamp: May 24, 2017, 02:34:26 am
content: I remember doing that in the early 80s. We used to layout boards with tape and stencils on a light table, usually at 4X. When that was done, run a brown line to proof against the schematic. When it checked out, took the sheets to a photo lab to get reduced to 1:1. Then took the film to the board house to be made. At that time, things were just starting to change. The company I worked for had just bought it's first cad system, I think I did one of the last boards with tape. The board house had just started digitizing the film. That's when rip-up really meant rip-up.

author: SimonR
author_rank: Regular Contributor
timestamp: May 24, 2017, 08:21:11 am
content: Same for me when I first started in industry in 1988, I just missed the missed the tape layout 4x method, although I did have to send some existing taped layouts for manufacture.My company had just installed some very expensive workstation based CAD systems.As an electronics engineer I had access to the schematic capture system but the drawing office was in charge board layout and component entry. I didn't have to generate gerbers but did have to sign off the component, the board layouts and then I had to physically sign the gerber plots themselves when the came back from the printers.

author: ar__systems
author_rank: Frequent Contributor
timestamp: May 26, 2017, 12:53:46 pm
content: Quote from: Alex Eisenhut on May 23, 2017, 09:34:02 pmRelaxing? I'm getting a headache just thinking about doing it that way

author: pepelevamp
author_rank: Regular Contributor
timestamp: June 13, 2017, 05:00:14 pm
content: This is a really great video.Some times you can feel a bit more confident in things when you see the experts learning processes for the first time too.

author: Jeffpcb
author_rank: Newbie
timestamp: June 21, 2017, 08:52:49 am
content: Nice video!learn much from it!thanks!

author: jpanhalt
author_rank: Super Contributor
timestamp: June 21, 2017, 09:23:59 am
content: Appeared here at least once before:https://www.eevblog.com/forum/projects/pcb-manufacture-back-in-the-day-how-expensive-was-it/msg612641/#msg612641(See: First link therin)Maybe this sort of thing should be indexed for easy reference?John
Raw PCB Material... - Page 1
Forum section: electronics / general

author: mrpackethead
author_rank: Super Contributor
timestamp: June 08, 2017, 01:55:09 am
content: 43x39" sheets of Raw 2 layer PCB.. This is how it arrives at the PCB Factory.. They cut this down into 'production' panels of 500x600mm to process it.

author: Jeffpcb
author_rank: Newbie
timestamp: June 21, 2017, 08:22:51 am
content: exactly,sirgenerally sheet size is 24*36,36”X48”,40”X48”,42”X48,
finished PCB for synthesizer module, tips on layout? - Page 1
Forum section: electronics / general

author: willbanks
author_rank: Contributor
timestamp: June 20, 2017, 01:34:20 am
content: I know how to layout components but what I don't know are good practices to do when laying out components. I observed some boards and noticed a lot of synth boards have resistors next to eachother, traces going under an IC and not between pins, capacitors near power supply, etc.If it isn't too much to ask for, tips on how I should change the layout of this board, if I did a big no no for design, etc.Some info on the board:This is an AD (Attack, Decay) generator. It produces a signal that has a variable rise time and fall time.

author: endevor100
author_rank: Contributor
timestamp: June 20, 2017, 02:11:42 am
content: Overall pretty decent. It's usually best to avoid acute angles like what you have to the right of R11. Especially for an audio application I would use a ground plane. It'll reduce signal noise and can make layout easier as you don't have to route the ground net as much.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 20, 2017, 02:32:22 am
content: Yeah, rows are fun. Pretty much the whole right side could be a single row of axial components. Doesn't look like that would be difficult to route.There's no ground plane, so expect it to be susceptible to ambient noise.Why THT? SMT is at least as easy, plus the board sits flat while you're working on it, and no cutting off leads required.Tim

author: willbanks
author_rank: Contributor
timestamp: June 20, 2017, 03:49:03 am
content: isnt SMT much more difficult to solder? thats why its through hole, and i dont plan on a mass manufacture.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 20, 2017, 11:10:27 am
content: Meh, 1206s aren't much smaller than 1/4W resistors already, and I've never met anyone who had a problem tacking them down.Personally, I go with 0805 and 0603. Below 0603, it gets much too tedious to do by hand, plus you'll definitely need magnification to inspect it (and if your eyes aren't so great, you'll need magnification while working, too).Even when I'm using THT parts, I tend to surface mount them (dead-bug or Manhattan style construction). It's so much easier than drilling holes in a one-off proto, or wiring up perfboard, constantly flipping it around to make sure you're connecting things right. Everything is on top and in view.If you don't feel that buying SMT parts is a good idea (maybe you're playing with THT parts on the breadboard, so you've already got stock of those), that's fair, too.Tim

author: Agent86
author_rank: Contributor
timestamp: June 20, 2017, 05:01:04 pm
content: Quote from: willbanks onYesterdayat 07:49:03 PMI was afraid of SMT before I tried it. Now I don't want to go back! Get yourself some flux and a set of tweezers and you'll find that SMT is *so* much faster than THT...Check out this video:http://store.curiousinventor.com/guides/Surface_Mount_Soldering/101
What are currently used CAD intermediate logic interchange formats? - Page 1
Forum section: electronics / general

author: RedPortal
author_rank: Newbie
timestamp: June 14, 2017, 05:27:49 pm
content: Hi everyone,I'm currently a EE student and I'm interested in developing open source synthesis softwares.While searching for information I found that BLIF(Berkeley Logic Interchange Format) was used as intermediate logic representation.Is this format still used?What are currently used internal formats in CAD softwares?What kind of other formats should I consider to support when building open source softwares?
Footprints for the aliexpress part "Jamma 44P with eyelets" - Page 1
Forum section: electronics / general

author: lk
author_rank: Regular Contributor
timestamp: June 12, 2017, 11:33:27 am
content: Greetings,Does anyone have the mechanical drawings for this part from ali express (i know its long:))https://www.aliexpress.com/item/5PCS-LOT-805-Series-44-Pin-Game-Card-Socket-Edge-Connector-3-96MM-Pitch-DIP/32594601686.html?spm=2114.01010208.3.1.waLeRN&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_5030016_10171_10084_10083_10080_10082_10081_10110_10136_10137_519_10111_10060_10112_10113_10155_10062_10114_437_10154_10056_10055_10054_10182_10059_303_100031_10099_10078_10079_10103_10073_10102_10096_10123_10189_10052_10053_10142_10107_142_10050_10051,searchweb201603_1,ppcSwitch_5&btsid=f2d7c87d-d5be-454b-986c-79bbad5f0475&algo_expid=c80a3e12-da7b-4dfd-8e99-7c052d64aca9-0&algo_pvid=c80a3e12-da7b-4dfd-8e99-7c052d64aca9Does anyone have the mechanical drawings or the PADSascii part for this item? It seems to be a standard Jamma item, but i have not been able to find the complete drawings for the 44 pin (2 x 22) part?-lasse

author: tycz
author_rank: Regular Contributor
timestamp: June 12, 2017, 04:05:38 pm
content: From the picture it looks like an ordinary 3.96 mm pitch,card edge connector to me. Why don't you use the data sheet of a similar part listed on Element14, etc?
panel breakoff - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 04, 2017, 03:32:56 pm
content: What's the best approach to panelize 8 mil Rogers boards? The usual breakoff tab for your typical fiberglass 62 mil thick PCB just breaks apart at the slightest touch...yup, I made a booboo.So I'm thinking of putting a bunch of 10 mil unplated holes around the board so it looks like a sheet of stamps.That should be solid enough yet easily torn apart?

author: Mattylad
author_rank: Regular Contributor
timestamp: June 04, 2017, 08:21:22 pm
content: Use IPC mousebyte tabs, they have a hole in them to make breakoff easier.

author: suku
author_rank: Contributor
timestamp: June 09, 2017, 08:21:02 pm
content: properly designed mousebytes are the most controlled and professional way of doing this in my opinion...
pcb-rnd 1.2.3 - Page 1
Forum section: electronics / general

author: ScribblesOnNapkins
author_rank: Regular Contributor
timestamp: June 09, 2017, 02:57:12 am
content: Ok sorry about the late post on this...We released 1.2.3 and it has some new features1. A more powerful layer system - Now solder mask, silk screen, and solder paste layers can have optional boolean operational layers and automatically generated ones hung off of it. So you can draw subtractions or additions in the solder mask for example.2. Eagle board import.3. The plugin system now has it's own internal dependency tracking. So interdependencies between plugins are resolved automatically.4. A new layer selector widget in top window and cross-section view upgrades to expose the new composite layer features of the editable layers.and more stuff...
PCB Library Expert tool query - Page 1
Forum section: electronics / general

author: Adwaittronics
author_rank: Newbie
timestamp: June 06, 2017, 06:15:49 pm
content: I am using PCB Library expert Lite 2017 version ,can anyone tell differences between the "Lite" and "Pro" versions?What extra features are available in "Pro" version which are not there in "Lite" version?

author: Mattylad
author_rank: Regular Contributor
timestamp: June 07, 2017, 05:58:01 pm
content: Try looking through the pcblibraries forum.It is well explained inhttps://www.pcblibraries.com/forum/free-pcb-library-expert-lite-vs-library-expert-pro_topic890.htmlBasically, the pro version does everything, saves your work so you can go back and output all your footprints 12 months later to another CAD package with ease.The free lite version is an enter and create then throw away your entry version, you want them again you enter the data again (not hard really).The lite outputs 7351-b only, the pro can be customized.Use the lite version to understand it, then for me for a business the pro version is well worth it in the time it will save you.FYI I have absolutely no connection to them, just an ex user.
Eagle 7.1 Excellon_24 Absent - Page 1
Forum section: electronics / general

author: SparkFly
author_rank: Regular Contributor
timestamp: June 05, 2017, 07:59:54 pm
content: Hi all,I am trying to generate gerbers for a PCB. I have used the manufacturer's job file (elecrow) but upon inspecting the output in a gerber viewer, the drills are spaced 10x further apart than they need to be. A bit of research has lead to several people suggesting switch the Device from Excellon to Excellon_24. However I cannot find Excellon_24 under device, neither can I find anywhere online to download it. Can anybody offer any ideas as to where I might find Excellon_24 - or other possible PCB fixes.Annoyingly I used the same job file just a few months ago and it worked fine....Regards.

author: MagicSmoker
author_rank: Super Contributor
timestamp: June 05, 2017, 09:14:30 pm
content: It's an option in the CAM processor. See attached pic showing where to find it. However, I should note that I've never had to change that setting and my boards turn out fine (apart from an annoyance with the Elecrow CAM/DRU default stop mask on vias setting, which ends up covering any via drilled under 100mils with soldermask...).BTW - there is a specific subforum under this one for EAGLE.

author: SparkFly
author_rank: Regular Contributor
timestamp: June 05, 2017, 09:39:32 pm
content: Thanks for the reply. Sorry for being unclear, but that is where I was looking before. For clarity I've attached what I see.I saw there was an Eagle subforum, but was unsure as the problem is missing Excellon_24... I suppose the problem is in Eagle though. I will bear that in mind for next time.

author: MagicSmoker
author_rank: Super Contributor
timestamp: June 05, 2017, 10:25:45 pm
content: Interesting... My version is 7.7 - the last before The Borg bought EAGLE - but I wouldn't think adding Excellon_24 would have been a high priority at any point in time for CadSoft.Maybe upgrade to 7.7 (supposedly still available for d/l, but I kept the zip file just in case)?
01005 (0402 Metric) Resistor Footprint - Page 1
Forum section: electronics / general

author: Kelbit
author_rank: Regular Contributor
timestamp: May 30, 2017, 11:08:06 pm
content: Just a quick sanity check here - I'm working on a project with an HDI board and I'm heavily pressed for space. I have a lot of external pull-up/pull-down resistors around the board which are currently 0201. I would like to drop them down to 01005 to save space. We don't have an 01005 footprint in our libraries at work, so I created one with the Altium IPC compliant footprint wizard (which uses LibraryExpert as its core). I used the dimensions & tolerances fromPanasonic's 01005 ERJ seriesas a template, and selected the IPC least material condition (high density).The resulting footprint seems... wonky:2The inner green box is the component outline, and the outer box is the courtyard. Altium's IPC wizard made the pads 0.15mm wide, which is narrower then the nominal width of 0.2mm for the resistor. I would have thought the pads should be at least as wide as the resistor maximum width (0.2mm + 0.02mm). They also seem overly long at 0.3mm. It feels to me like this part will tombstone.Can anyone share the dimensions of a good high density 01005 footprint that they've used so I can compare?

author: Monkeh
author_rank: Super Contributor
timestamp: May 30, 2017, 11:12:02 pm
content: You've entered a value wrong or something is wrong with the Altium wizard.Download the standalone version and work the footprint out with it:http://www.ipc.org/html/private/landpattern/Library-Expert-2017-11.zip

author: Kelbit
author_rank: Regular Contributor
timestamp: May 30, 2017, 11:28:44 pm
content: Good call! Seems to be a bug with the Altium wizard, I am using exactly the same inputs, but LibraryExpert gives me a much more sensible footprint. I will modify the footprint to use the LibraryExpert values.In case anyone comes here via Google, here's what Library Expert says an 01005 high density resistor footprint should actually look like:Time to file another Altium bug report - I think my support rep is going to start hating me real soon.

author: voltsandjolts
author_rank: Unknown
timestamp: June 04, 2017, 12:48:50 pm
content: Looks like you entered the right values in the wrong entry box.

author: Fgrir
author_rank: Regular Contributor
timestamp: June 04, 2017, 04:58:31 pm
content: The OP hasn't entered anything wrong. I can confirm the same result if I enter the Panasonic dimensions into the Altium IPC wizard. I don't know that it is really a bug though - it looks to me like it is the High Density Side Fillet setting of -0.05mm that is making you uncomfortable. That number doesn't seem to scale with the part dimensions so it gets pretty significant with such a small part. I wonder if that number comes direct from IPC specs?You can always use Medium density or just manually change the side fillet to something you like better.
How to buy Linear Systems dual JFETs (LSK489, LSK389) - Page 1
Forum section: electronics / general

author: palpurul
author_rank: Regular Contributor
timestamp: April 25, 2017, 08:17:06 am
content: I've been looking around for a while to buy on of these sweet low noise JFET pairs from Linear Systems, but it seems like they are not available from large component suppliers (digikey, mouser, farnell etc.). Are they even in production? I live in Turkey, so ebay and small suppliers are not an option because of high shipping. I need 10-20 of these for now, but I am going to need them in large quantities in a long run (a few thousands). Is there a reliable supplier of these JFETs that has somewhat reasonable shipping option?I am waiting for your suggestions.

author: floobydust
author_rank: Super Contributor
timestamp: May 30, 2017, 02:10:27 am
content: Linear Systems advises they have many distributors in Europe that will take orders, provided with credit card number or do a wire transfer to pay for the parts and shipping.In North America,Trendsetter Electronicsseems to be the small volume distributor. DIY Audio store has offers some but out of stock.I wonder how to convince Digi-Key to sign them on?

author: floobydust
author_rank: Super Contributor
timestamp: May 30, 2017, 02:54:09 am
content: Forgot to mention, there's an AMA on reddit Tim McCune from Linear Systems.https://www.reddit.com/r/diysound/comments/5ynnsc/im_tim_mccune_from_linear_integrated_systems_ama/
When asked which E-CAD tools designers use , the answers were as follows - Page 1
Forum section: electronics / general

author: GreggD
author_rank: Regular Contributor
timestamp: August 09, 2017, 06:16:23 pm
content: Per Printed Circuit Design & Fab MagazineUsed weekly•Altium Designer: (30.9%)•Cadence Allegro: (29.9%)•Mentor XPedition: (23.9%)•Mentor Pads: (20.3%)•Cadence OrCAD: (15.3%)•Mentor Board Station: (5.6%)•Zuken CR-5000: (5%)•Zuken CR-8000: (2.3%)•Eagle: (1.7%)•Zuken CADStar: (1%)•Other: (12%)http://pcdandf.com/pcdesign/index.php/magazine/11908-salary-survey-1708I use Orcad for schematics and Pads for pcbs.

author: BigBoss
author_rank: Regular Contributor
timestamp: August 09, 2017, 06:45:13 pm
content: Quote from: GreggD on August 09, 2017, 06:16:23 pmHow to convert the netlist of orCAD to PADS ??Or how to use both simultaneously

author: thm_w
author_rank: Super Contributor
timestamp: August 09, 2017, 10:07:54 pm
content: If you do by company:- Mentor 49.8%- Cadence 45.2%- Altium 30.9%- Zuken 8.3%Can anyone comment on the difference between XPedition/Pads/board station or the various Zukens? Is it similar to altium vs circuit maker?

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 09, 2017, 11:18:16 pm
content: Quote from: BigBoss on August 09, 2017, 06:45:13 pmI don't think you need to convert anything, simply select "other" when creating the netlist and there's a bunch of formatters to pick from. How well it works, I don't know.

author: DerekG
author_rank: Frequent Contributor
timestamp: August 10, 2017, 12:16:43 am
content: Quote from: GreggD on August 09, 2017, 06:16:23 pmOnly professional engineers would likely read this magazine & only if they have time. So one would expect that the survey results would only include expensive top line pcb design software.I've never read the magazine, nor am I ever likely to. I design boards (often) on a day in day out basis. I have Altium Designer, but generally I dislike it along with disliking Altium the Corporation.For 90%+ of my boards designs I use DipTrace. It is a very cable tool that has logical menus etc etc. I just like it, so I use it.As a contract design engineer I'm often asked "which is the best circuit board design software?" My usual answer is "any package that does what you require & that you enjoy using".I can export my designs into may formats include Altium, so for me it makes little difference which package I'm requested to use as long as I can find a suitable export filter in DipTrace.

author: GreggD
author_rank: Regular Contributor
timestamp: August 10, 2017, 06:08:43 pm
content: Many IC companies use Orcad for schematics and Pads or Allegro for layout. Many of them have them available for download. Allegro useds Orcad (Orcad Capture)(Design Entry CIS) for schematics.Yes for netlist from Orcad its Netlist, other, orPadspcb.dll But I use Chuck T's Orcad-to-Pads netlister, PowerNET.exe which must be renamed orPowerNET.exeIt is a much better solution. But wait there is more! In Orcad export to 16.2 format, in Pads Logic, import, tools, Pads Layout. and now you are cross probing which makes part placement a wiz.
Eurocircuits & Kicad - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: May 15, 2017, 08:54:50 am
content: I just received a mailing from Eurocircuits:"You will now be pleased to know that we have opened these benefits to KiCAD users by providing the possibility to Uploaddirectly to PCB Visualizer the . kicad-pcb files, this is an encapsulated file format containing all the data required,with logical layer naming and ordering ensuring no misinterpretation or additional clarification."http://www.eurocircuits.com/blog/kicad-design-rules/http://www.eurocircuits.com/blog/kicad-eurocircuits-reads-in-native-kicad-data/

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: May 15, 2017, 10:46:57 am
content: I tend to look at the Gerber export as one more chance to see that everything is as I expected, and not just as it seems in KiCAD. Much like printing out text in a different font and size helps your brain to spot errors previously undetected, watching your Gerbers in a different viewer may expose some issues you did not notice in your EDA.Might be nice for an extremely quick one-off but you'd need to be in a real hurry to skip over the 15 minute process that is Gerber creation and verification for those small boards.I never use the native upload features. I never will.

author: nctnico
author_rank: Super Contributor
timestamp: May 16, 2017, 12:20:37 am
content: IMHO doing native uploads is better because a lot can go wrong during the Gerber generation stage. Also Eurocircuits has a very extensive web-based PCB checking tool which can show a lot more than you'd see in a gerber viewer.

author: VinzC
author_rank: Frequent Contributor
timestamp: May 17, 2017, 01:03:32 pm
content: Regardless of whether *you* would send native PCB files or not, it's a great honour from a PCB manufacturer such as Eurocircuit to support the open source PCB Kicad. Kicad developers must be proud of their product in regard of such an achievement. To see an open source PCB project supported amongst two other giants like Altium and Eagle is a reward to no other comparable. This proves Kicad as a serious alternative, like it or not.Congratulations, guys!

author: Deridex
author_rank: Regular Contributor
timestamp: May 19, 2017, 03:53:55 am
content: Quote from: VinzC on May 17, 2017, 01:03:32 pmGotta agree on this. Let's see how long it takes em, to change all the guides and other documents to this state.
TSOP 48 Type 1 - Different dimension - Page 1
Forum section: electronics / general

author: ultrasmurf
author_rank: Regular Contributor
timestamp: May 16, 2017, 02:33:18 am
content: Hi All,I was replacing SRAM on an old controller. Was ordering the TSOP48 package without paying too much attention on the body/pin to pin dimension as I thought TSOP48 type I has only 1 standard size. After removing the old component I was struck with horror as I tried to positioned the new SRAM and could not fit it within the pads. Pitch was ok, body width was ok, and the issue is on the body length. The old SRAM has body length of 16mm with 18mm pin to pin. The new TSOP48 has 18mm body length and 20mm pin to pin.Browsing around the only thing I can find is clip on adapter that has a mention of these 2 different size, but I cant figure out what standard is the 16mm body is following.Refer to herehttp://www.edcon-components.com/Webside/LIE/500637/PDFE/tsop-typei-pinchcontact.pdfI am trying to source for a new SRAM with the correct dimension, and started to pull my hair as checking the specsheet 1 by 1 shows that all of the one I have checked from mouser and element14 has the 20mm pin to pin. Would like to be able to quickly shortlist the possible replacement by putting standard name on google. So if anyone could help me out by letting me know what standard is the TSOP48 with 18mm pin to pin length called ? (i.e. JEDEC xxxx, ISO xxx, etc)Thanks....