hybridfree/eevblog-posts huggingface dataset:
kelly controller - need seassoned engeenir/know how to support proper utilizing  - Page 1
Forum section: electronics / projects

author: eevblogfan
author_rank: Frequent Contributor
timestamp: June 19, 2014, 09:53:19 pm
content: HelloSo I've owned 4.5Kw (i'll put the correct model number tomorrow or so ) . Unit of kelly controllers.The usage is high relaiabuillity ebike , kipable of traveling sertain dictance . With the abuillity to climb given hill (the numbers are X for that stage ) . Using the motore's kinethic energy only .My concern is over volting the internal nmos's during operation .The bike is going to weigh ~80kgSpecs :Above 40 kM per charge (min)Around 70Km per charge (wanted )As high as 130~150Km per charge - on flat ground , it's high I know .. but i am going to attempt at the secoand round hopefully .Dimond/star config switchable windings in the motor (will be revisited once rellevant )60-90v operetional average voltage ( either 60,72,84,96v pack )Regen- i need to do some math in order to determin the proper place of thath feature ,do to concerns of over volting my controller when dimond config of the windings .There are at least two part of that project :1) the soonest bike I'll be able to build .2) the main goal witch is pretty hard to build but i really am going to do this , probably step by step , and for the experience I miss in that field(s) i hope to get here the needed support/channel to tallk to .So : now I got one of the early "Rush " Cannondale bike , with radium susspensor and in front rock shoks 110mm folk , 500W "Throtter" hub motore . Dimond configured , without the sensors , due to luck of space , so i am using "500W" 48 V "sensorless" controller , the shunt inside it is sildered to piece of 2.5mm^2 wire so it gives me higher torqe , i am running it of 5×12V SLA rated at 14AH , it gives me only 20 Km of range , using Ulysse speedometer's meassurments ,My soonest goal is to use the kelly controller with >4Hp motore , or at least config it so that it won't burn the motore , and see how many Kwh of battery capacity I need to drive above 35Km per charge , without abusing any of the given "key" parts ( controller , battery or motore ) .There is more to be written , i do need to run some practical test such as current draw curve ( possible using my fluke 287 ) , voltage monitoring perhaps or more importantly , energy consumption over given range of riding , and hopfully learning the pysics involved , regarding to the motore/electric's related , and the pysics of the ebike in terms of safty margine , excelleration , and safty brakes .Thank you in advance and hopefully it will begin to move
Kelvin Connection Errors - Page 1
Forum section: electronics / projects

author: dracotonisamond
author_rank: Newbie
timestamp: July 19, 2022, 01:31:34 am
content: Recently i had a prototype board manufactured and it came with a manufacturing error in one of the kelvin connections where the wire is fused to the pad early.what sort of errors in measurement should i expect with this defect or will it be trivial?im trying to figure out if its worth assembling or not because these chips are not easy to come by anymore.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 19, 2022, 01:44:54 am
content: That should make no difference. The entire back edge of the pad should be nearly equipotential and carrying little current.

author: ConKbot
author_rank: Super Contributor
timestamp: July 19, 2022, 02:49:37 am
content: https://www.analog.com/en/analog-dialogue/articles/optimize-high-current-sensing-accuracy.htmlWhile there is no direct mirror of your situation there, you can see that the error can be quite large, IF you are using an extremely low value current shunt like in the paper there. (They are using a 500uohm resistor)Since you neck the trace out to the shunt resistor asymmetrically on side that wasn't etched properly, if you are running a very low value shunt, there could be "some" error. If the voltage dropped over the shunt swamps any field gradients in width of the trace, then error could be negligible.If it were a straight shot in and out of the resistor pad, with the trace the same width, I'd agree that the back edge should be equipotential, but with the practicalities of an actual layout, it's solid into "it depends" territory.

author: dracotonisamond
author_rank: Newbie
timestamp: July 19, 2022, 03:31:41 am
content: the pad in question is a 5mohm low side shunt for a battery fuel gauge.the defect side is to the negative terminal of the battery pack.i believe this gauge(MAX17320) should correct for the mismatch since the defect will affect current in both directions.and the sense resistor's terminal doesnt sit on the edge of the exposed pad.ill probably just go ahead and assemble the prototype board.

author: Kleinstein
author_rank: Super Contributor
timestamp: July 19, 2022, 06:59:46 am
content: The layout on the current side for the shunt looky like it would distribute the current resonable well. So there should not be very much voltage over the length of the pads. How much would also depend on the details of the shunt and how evenly the solder is.5 mOhms is also not yet super low in resistance.The error that would happen is of the type of adding a small part (likely in the lower µohms range) of the copper (and solder) resistance to the shunt. So the the type of error would be a slightly more positive TC of the shunt resistance. It would effect both directions in the same way, so no problem there. The current terminal to the right is long enough so that the part outside the picture can no do much in disturbing the balance.
Kelvin Varley Divider design - one little question - Page 1
Forum section: electronics / projects

author: cape zoloh
author_rank: Contributor
timestamp: September 17, 2020, 06:39:35 pm
content: I've seen KVDs following the rule of 10k-2k-400r-80r-16r..... - each following resistor ladder uses resistors with a resistance 1/5th of the previous one.I've also seen designs when they use several 10k ladders in a row, and that seems to work as well.It would be very practical if one could use only 10k resistors for all ladders.Is that possible? If not, why?Thanks!

author: MosherIV
author_rank: Super Contributor
timestamp: September 17, 2020, 07:05:44 pm
content: QuoteNo it will not work.Each stage of the kvd forms a voltage divider network with the previous stage.If the resistor are all the same, the divider is all wrong for the next stage.Design where they use a couple of 10K in a row have been carefully work out to make sure the ratios still work.Hope I have explained it clearly enough.

author: Dave
author_rank: Super Contributor
timestamp: September 17, 2020, 10:18:03 pm
content: Quote from: MosherIV on September 17, 2020, 07:05:44 pmYes, it will work.The real reason why you wouldn't want to use all equal value resistors is that barely any current is going to flow through the lower digit circuits. This means that the output voltage is going to be very easily disturbed by any input bias currents that the null meter might be producing.Having a KVD with progressively lower resistances towards the lower the digits means that the current is larger, mitigating this problem to some extent.

author: The Soulman
author_rank: Super Contributor
timestamp: September 17, 2020, 10:50:29 pm
content: Conrad Hoffman did a nice write-up in part three of his mini-metrology-lab series:http://www.conradhoffman.com/mini_metro_lab.html

author: Kleinstein
author_rank: Super Contributor
timestamp: September 17, 2020, 10:52:11 pm
content: One can use equal value chains and extra compensation resistors. However there is a downside to this, somewhat related to less current flow: with equal resistors one adds more to the output resistance.One can use a combination like:1st chain switch with 50 K2nd chain with 10 K3rd chain with 2 K4rd -6 chain with 2K + compensation resistor parallel to the chain.This way the lower chains don't add that much to the output resistance an on can still use several equal ones.

author: cape zoloh
author_rank: Contributor
timestamp: September 18, 2020, 03:46:27 pm
content: Very helpful answers. Reason for asking is that it is hard to get them Vishays in all values.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: September 18, 2020, 03:51:24 pm
content: Remember that the top string is the most important. By the time you reach the lower two or three divider strings, you can use garden variety metal films, selected for value. Some units even use a wire wound pot for the last divider.

author: cape zoloh
author_rank: Contributor
timestamp: September 18, 2020, 03:56:00 pm
content: Was just about to edit above text, when I realized i had forgotten this. Thanks for the heads up!
Kemet SPICE (capacitor paramater simulator thingy) - Page 1
Forum section: electronics / projects

author: Smokey
author_rank: Super Contributor
timestamp: April 08, 2013, 06:27:05 pm
content: I just got an interesting email from the capacitor company Kemet. It looks like they have a web based tool that lets you generate plots of various capacitor parameters with respect to other parameters for their products. Kinda cool looking.http://www.kemet.com:8080/webspice/Default.aspx
Kenwood DCS-8200 - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: January 07, 2022, 10:19:50 am
content: Hi all,i have a kenwood DCS-8200 50 mhz scope here,on the rear it has an rs232c port on it,could this be used to control the scope and view the screen on my pc,(win7 sp2),if so what program could i use to do this?,TIA.
Kenwood TM-221 fault - Page 1
Forum section: electronics / projects

author: christopher iles
author_rank: Regular Contributor
timestamp: December 28, 2013, 11:22:47 am
content: Hello,I have a Kenwood TM-221A 2m FM transceiver which worked fine until it got stored away a few years ago. Recently I powered it up and I cannot receive any signals. I've done a reset, the transmit is working fine, the display looks normal and I get noise from the speaker.I've looked for dry joints etc. all seems ok.Has anyone else had this problem I wonder? Any advice would be welcome, thanks!
Kenwood TM-221E - Page 1
Forum section: electronics / projects

author: christopher iles
author_rank: Regular Contributor
timestamp: June 08, 2014, 04:31:00 am
content: Hello,Has anyone got a good picture of the foil side of the main pcb in the TM-221E please? All the ones I've found on the internet are very poor quality.Apart from being riddled with dry joints I suspect that one or more pcb tracks have hairline cracks.Any help with a drawing appreciated.Thanks,Chris.
Kenwood TRIO CS-1560A - Help - Page 1
Forum section: electronics / projects

author: fgsantos7
author_rank: Newbie
timestamp: June 07, 2013, 09:55:31 am
content: Hello, I've been watching Dave's videos for some years now, but never registered in the forum. Recently I've received an old analog scope, a Kenwood TRIO CS-1560A, and it's faulty. I tought that maybe I can get some help in Dave's forum cause I don't have any knowledge or experience on repairing these products.http://www.flickr.com/photos/xtl/1905557889/#lightbox/So these are the 2 problems I've found:1 - One of the channels only works on AC mode (doesn't change to DC mode). I'm Assuming that the panel switch isn't switching.2 - The Trigger only works in auto-mode and I can hold any waveform. It's always running. In fact when I switch to manual mode the waveform completely disappears.I've managed to get the service manual for this scope in the web I'll post the link.https://www.dropbox.com/s/1or63g1uq3ztws0/Trio%20CS-1560A%20Oscilloscope%20Service%20Manual.pdfThanks to anyone that could help me.

author: Unknown
author_rank: Unknown
timestamp: June 07, 2013, 11:09:29 am
content: Wow, that scope looks in great condition! i've got the CS-1577A which is very similar except more battered looking, so the service manual you've posted will be very handy ;-) I'm only a beginner myself so sadly I can't help you out but what I've found with mine is that the switches sometimes "glitch" whilst switching - so at some point I'd need to clean all those.

author: w2aew
author_rank: Super Contributor
timestamp: June 12, 2013, 02:23:24 am
content: Quote from: wilfred on June 12, 2013, 01:36:30 amYes, this is how the Normal Trigger mode works. You only get a trace when the trigger conditions are satisfied. You might want to review this video on analog oscilloscope trigger controls.
Kerry Wong's LC meter - Issues with schmitt trigger side. - Page 1
Forum section: electronics / projects

author: GabYoung92
author_rank: Regular Contributor
timestamp: November 21, 2012, 10:12:14 am
content: Hi all!I've been prototyping Kerry's LC meter fromhttp://www.kerrywong.com/2010/10/16/avr-lc-meter-with-frequency-measurement/Prototyping the "LC Meter - Oscillator" circuit on a breadboard gives a nice output from the first OP-Amp with the input shorted (L/C and Ground). My issue now is the second output which is labelled to go to pin5.Of the attached image: CH1 is the first output, CH2 is the Schmitt trigger output.Would anyone have an idea of what may be going wrong?- I am using a LM319

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 21, 2012, 02:23:56 pm
content: It is an open collector output, so if you leave the arduino out you will need something else to pull up the output.1-10K to VCC should do the trick.

author: GabYoung92
author_rank: Regular Contributor
timestamp: November 21, 2012, 10:18:21 pm
content: The image attached uses a 1K pull-up resistor. If I attach the output to an arduino's #5 pin, I still get the same as my first post. I'm thinking I could use the pullup resistor as well, but is the waveform clean enough to do this?

author: Thor-Arne
author_rank: Unknown
timestamp: November 22, 2012, 12:16:39 am
content: I don't trust that spike on the blue line.Perhaps the cause is the wiring on the breadboard, considered solder it on a strip board?

author: GabYoung92
author_rank: Regular Contributor
timestamp: November 22, 2012, 11:50:11 am
content: With the blue trace connected to the arduino, it's reading 100kHz higher than it should be...Linking the output to a 74HC14 gives a nice output and is reading correctly.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 22, 2012, 01:35:09 pm
content: Can you show how you used the LM319 in the circuit? I have the feeling that something is wrong in your schematic.

author: AlphZeta
author_rank: Regular Contributor
timestamp: November 24, 2012, 09:06:56 pm
content: Hi @GabYoung92,Sorry I forgot to include the pull up resistor in the schematics, and also the value of the feedback resistor should be 100K instead of 10K for the schmitt trigger stage. I will update the post and put a note there.Of course, you could just use 74HC14 instead.
Keweisi power monitor - Page 1
Forum section: electronics / projects

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 12, 2021, 02:59:11 pm
content: Hi,Some time back I bought a keweisi usb power monitors. It would be useful.As I had lots of usb mains adapters and cables around. And wanted to know which combination of cables and usb mains adapter delivered the best power output when charging a phone.I had not used it anywhere other than the above.I thought it would also be handy when plugging in the the development boards connected to circuits into the laptop to monitor any over current conditions.Not sure if it was a good idea. As of now the laptop fan is going like crazy.Never had such trouble with circuits and development boards being connected to the laptop before this.I'm suspecting spyware I can not be absolute but something's odd. Any thoughts on this would be appreciated.Thanks

author: Terry Bites
author_rank: Super Contributor
timestamp: June 14, 2021, 02:50:36 pm
content: It could be a way of sneaking spyware in to your laptop- but I doubt it, unless your OS is very out of date.If its an MAC the fan going crazy is normal part of pre-programmed melt down process.
keyboard troubleshoot - Page 1
Forum section: electronics / projects

author: timelessbeing
author_rank: Frequent Contributor
timestamp: January 15, 2014, 11:30:46 pm
content: My bluetooth keyboard recently stopped working. It doesn't power on at all, and I have no idea why.I tried fresh batteries, and even a dc power supply. I probed the GND and Vcc pads and they test good. What else can I do to narrow down the problem?attached: image of the main board

author: EvilGeniusSkis
author_rank: Regular Contributor
timestamp: January 18, 2014, 01:19:48 am
content: I would check the condition of the power switch/button, look for blown fuses, burned out chips signs of water damage or anything else along those lines.

author: timelessbeing
author_rank: Frequent Contributor
timestamp: January 18, 2014, 06:27:34 am
content: Everything you mentioned checks out good.Maybe I'll test the caps for shorts....
Keyence IXH Controller Input Current - Page 1
Forum section: electronics / projects

author: jptg
author_rank: Newbie
timestamp: August 15, 2023, 05:36:23 pm
content: Hi everyone,I need to make a simple program switch for an encloure on a Keyence IXH vision controller. Currently it only runs one program, but I need an operator switchable program change. Supply to the controller is 24 VDC from PLC power supply. The user manual for the controller specifies this for PNP inputs:"For voltage input: Maximum input rating 26.4 V, ON voltage 18 V or higher, OFF current0.2 mA or lower, ON current 2 mA (for 24 V)"I can specify within the controller that Input 1 ON will switch to program 2. My question is, in order to get power to the input lead, is it acceptable to use a simple Open/close toggle switch, tapped in from the supply power to supply the input lead? Do I need to be worried about current?Thanks in advance.
Keypad membrane, substitution by ic's possible ?? - Page 1
Forum section: electronics / projects

author: coromonadalix
author_rank: Super Contributor
timestamp: September 03, 2019, 07:24:41 pm
content: I have an 5 rows by 8 cols membrane (keypad of 38 buttons) whos dying and i want to substitute it by technology for future automation by a future HMI interface module from DWIN.Ie : switching ic's, and a serial (rs232 level max232) slave kinda look a like arduino if possible ...The rows are pulled high (+5v) by 100k resisstors and goes thru a 74hc244The cols are going to an 74hc374There is no signal diode or anything else in the keypad circuitI'm poor at coding, searching for similar projects, ideas, codes snippets ??I'll check the specs to know if it will or could talk back on the serial (acknowledge, command echoing etc .. )For a keypad substitute, a guy at my job is searching for custom made one(s) ... but eventually i'll have to put something in parallel with the keyboard.Can it be done ?thks

author: coromonadalix
author_rank: Super Contributor
timestamp: September 04, 2019, 04:15:32 am
content: Answered my own questionshttp://www.arduinoforum.nl/viewtopic.php?f=6&t=1923&start=10#p15323Using an AD75019 but they are pricey 38$ a piece outch

author: oPossum
author_rank: Super Contributor
timestamp: September 04, 2019, 04:34:41 am
content: Do you need more than one key at a time?A pair of 74HC4051 will do  one key. Special keys like shift can be done with 1/4 of a 74HC4066.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 05, 2019, 01:46:22 am
content: nope just a push of a single switch, and two switches who may need to be pushed 1-3 seconds long.Found many "crosspoint switches" parts at Mitel, Hynix, Renesas, Analog device, etc ... literally tons of fake from chinaFound arduino and avr code snippets, will try to implement a solution with an arduinoI did not knew the "crosspoint switches" terms, thats why i have posted hereGonna try to play with Mitel mt8808 and mt8816 they cost around 10-12$ each, an AD75019 is 40-50$ a piece lollthks for the 4051 tips it may prove useful too

author: Someone
author_rank: Super Contributor
timestamp: September 05, 2019, 07:54:33 am
content: https://www.eevblog.com/forum/beginners/simulate-a-matrix-keypad-with-a-microcontroller/or offsite:https://www.avrfreaks.net/forum/reverse-matrix-keyboard-emulate-itMany cheap micro controllers can do this without any external hardware. But unless the comms channel is extremely slow you need a software architecture that is non blocking on either the communications channel or the matrix emulation.
Keypad - Page 1
Forum section: electronics / projects

author: Irilia
author_rank: Regular Contributor
timestamp: September 03, 2024, 03:20:48 am
content: I have some ideas for the the keypad, to replace the individual button.But I'm curious of how you will resolve this problemThanks.Ps) the picture of the first prototype (the individual button).

author: inse
author_rank: Super Contributor
timestamp: September 03, 2024, 05:27:51 am
content: Aha - context?

author: RoGeorge
author_rank: Super Contributor
timestamp: September 03, 2024, 06:35:30 am
content: Nice build.For a ready made control panel, I would probably use a MIDI controller pad. They come in all forms and shapes, bigger or smaller, or as elements that can be snapped together to form a bigger controller pad. Usually used by artist, to control musical synthesizers, stage animatronics, theater lights, concert lasers, etc.Random examples of MIDI controllers:https://duckduckgo.com/?q=midi+controller+pad&iax=images&ia=images

author: Irilia
author_rank: Regular Contributor
timestamp: September 03, 2024, 06:54:46 am
content: Quote from: inse on September 03, 2024, 05:27:51 amThis is the front of "the station" this includes the numbers 0 to 9 what explain the numbers of button

author: Irilia
author_rank: Regular Contributor
timestamp: September 04, 2024, 12:30:40 am
content: I forgot to send this file containing the drawing of the keypadYou will probably better understandI don't send pictures of the idea I have for the keypad to not influence about the design, I think it's the best to get new solutions new idea.Also I'm curious what you think about the layout, what should be modified.Thanks
Keysight 3000 encoder type? - Page 1
Forum section: electronics / projects

author: FrankBuss
author_rank: Unknown
timestamp: July 11, 2017, 01:35:16 pm
content: I have a DSO-X 3012A and I like the rotary encoders and would like to use it for my projects. Does anyone know which type they are? Don't want to open it, maybe someone has already documented it, looks like they use the same for many different scope models.I would like to have both, the detented one for the big time base knob, and the small button type with no dents, and the same caps. But I guess the caps might be custom made, but they are not important, there are lots of other caps to buy, if the shaft diameter is some standard size.

author: Estaxe
author_rank: Contributor
timestamp: September 11, 2024, 08:26:15 pm
content: Emmm, i am a little late to the party, but maybe this info will be useful for some people who will search the forum and will find this topic. Encoders:No detent: PEC12R-4020F-S0024 (Bourns)Detent: PEC12R-4220F-S0024 (Bourns)
Keysight / Agilent (ADS) license costs - Page 1
Forum section: electronics / projects

author: larry42
author_rank: Regular Contributor
timestamp: January 23, 2019, 12:25:54 pm
content: Hi - would someone be able to get get the licensing costs for various ADS bundles?I have to go through a 3rd party distrib here and as they are not even providing any support (just a cost overheard to give us a license key once a year) I would like to know if I'm getting fleeced.Could someone in the EU get a quote directly from Agilent? please PM me
Keysight Back to Basics DVD - Page 1
Forum section: electronics / projects

author: marshallh
author_rank: Unknown
timestamp: July 14, 2015, 08:59:18 pm
content: Download (780mb):http://retroactive.be/B2B%202015.isoGreat resource with lots of appnotes on using test equipment. If you don't know what you don't know, start here.

author: marshallh
author_rank: Unknown
timestamp: July 14, 2015, 09:05:43 pm
content: Also here is the Agilent 2014 DesignCon DVD:http://retroactive.be/design_con_2014.isoMostly high end bleeding edge presentations.Quote

author: mtdoc
author_rank: Super Contributor
timestamp: July 14, 2015, 11:50:58 pm
content: Downloading the BTB DVD now. Thanks for the link!

author: HighVoltage
author_rank: Super Contributor
timestamp: July 15, 2015, 07:14:15 am
content: Just finished the download, thank you !

author: Melt-O-Tronic
author_rank: Frequent Contributor
timestamp: July 16, 2015, 05:11:44 am
content: Nifty. Thanks!

author: John_ITIC
author_rank: Frequent Contributor
timestamp: July 16, 2015, 07:10:12 pm
content: Downloaded!

author: f1rmb
author_rank: Regular Contributor
timestamp: July 16, 2015, 10:09:19 pm
content: Thanks !

author: Cliff Matthews
author_rank: Unknown
timestamp: July 16, 2015, 11:43:55 pm
content: Quote from: marshallh on July 14, 2015, 08:59:18 pmVery nice indeed. A great deal of PDF's with all access menu driven. I did note in the content folder there's 6 .ARF files though.. (webex player format)Good content butfor those not wanting to install the Webex player to see just those 6 files, go to:https://www.youtube.com/user/KeysightWebcasts/featuredThese are the webcast names to look for:H:\content\Webcasts>dir *.arf /b12 Tips on How to Select Your Next Oscilloscope.arfAnalyze Agile or Elusive Signals Using Real Time Measurement.arfDigitizer Fundamentals Design Considerations to Achieve Superior Measurements.arfPower Supply Fundamentals Getting the Most from your DC Power Supply.arfSimplify Your Test Setup and Measurements with Keysight Switching Solutions.arfSuccessful Modulation Analysis in 3 Steps.arf

author: albert22
author_rank: Regular Contributor
timestamp: July 17, 2015, 03:42:43 pm
content: Downloaded. Thanks

author: timofonic
author_rank: Frequent Contributor
timestamp: August 20, 2015, 02:57:13 am
content: Quote from: marshallh on July 14, 2015, 08:59:18 pmI submitted a form and I received it some time ago!It came from Jamaica! And despite the professional looking front, it's clearly a DVD-R.

author: sorin
author_rank: Frequent Contributor
timestamp: October 08, 2015, 05:45:05 pm
content: Thanks

author: jrward
author_rank: Newbie
timestamp: October 08, 2015, 05:52:02 pm
content: Quote from: Circuiteromalaguito on August 20, 2015, 02:57:13 amIt's probably way too expensive to press out such a small run of DVDs. Also, if they wanted to update it, they would be left with a batch of DVDs to throw away.
Kicad 5.0 is not recognizing a global power net - Page 1
Forum section: electronics / projects

author: hummusdude
author_rank: Regular Contributor
timestamp: April 13, 2021, 04:13:55 am
content: I have an audio pre-amp with active tone controls and digital volume control via a dPot. The power to the board is +- 25VDC from a power supply board for a power amp...I plan to put the pre-amp board in the case with the power amp. VDC in goes to an L7815/L7915 pair of linear voltage regulators for the op amps in the analog side. But to power the digital components I used an L7805 that was supplied from the output of the L7815. I know I could drive it right from the +25 VDC line but I thought it might dissipate less power if I used +15VDC.But in tweaking the circuit I decided to use a small wall wart to power the digital components. I've read different things about potential problems with noise so I wasn't convinced that it would be a problem. It solved the problem of the 7805 getting warm and I couldn't see much noise on the power rails.I decided to go back to the L7805 out of prudence. I do have form fitting heat sink for the L7805 so probably I can use it and the heat won't be too much. But when I put it back in the schematic KiCad now thinks that the output of the L7805 and the L7815 are connected and they are both at +15VDC! The global nets on the outputs of each are clearly not the same...or am I missing something?

author: twospoons
author_rank: Frequent Contributor
timestamp: April 13, 2021, 04:21:16 am
content: Quote from: hummusdude on April 13, 2021, 04:13:55 amYeah - the green line through U7 thats connecting 15V to 5V. Looks like Kicad is doing precisely what you asked it to do.

author: hummusdude
author_rank: Regular Contributor
timestamp: April 13, 2021, 04:53:24 am
content: Doh!
kicad - change via pad to IC's pin pad - Page 1
Forum section: electronics / projects

author: epy
author_rank: Regular Contributor
timestamp: October 20, 2018, 05:43:47 am
content: Hi,I am designing PCB in kicad. I am trying to change the via pad bit same as IC pin's pad. I didn't get success. i googled but no similar searches.Here is in picture, i want to make PAD 1 same as PAD 2.

author: rs20
author_rank: Super Contributor
timestamp: October 20, 2018, 05:56:12 am
content: To translate your request into clear English, you want to make your via have a big oval/rounded rectangular pad rather than the small circular one?You can look up online how to change via pad and drill sizes, I'm not sure if a via can be made oval though.

author: awallin
author_rank: Frequent Contributor
timestamp: October 20, 2018, 06:02:18 am
content: make a single-pad footprint with the shape you want (oval) and use that instead of a via?if you want your schematic-netlist-pcb to match up I guess that means you would ad a schematic symbol where you want your via-footprint..
Kicad filled zones / ground plane - Page 1
Forum section: electronics / projects

author: Dajgoro
author_rank: Frequent Contributor
timestamp: January 24, 2015, 12:10:12 pm
content: Hi.I've been poking a bit with kicad lately, and I did some pcb-s.One thing that I can't figure out is how to mark the fill zones.The problem I have I rout everything, then I add the ground plane with the fill tool, but in all that mess (2 layer pcb) it is hard to figure out where is each part connected to. It often makes a maze with long loops to certain parts, and I can't find any tool to highlight the ground plane so that I can see where ground goes. And how can I properly stitch sections of the ground plane that are separated with a long loop. I tried just making a thick jumper trace, but when I refill the zone that jumper trace that I made previously gets insulated.

author: aveekbh
author_rank: Regular Contributor
timestamp: January 24, 2015, 01:57:06 pm
content: Hi Dajgoro,Could you add a picture of what you mean? I could try it out and see if it works for me.

author: Dajgoro
author_rank: Frequent Contributor
timestamp: January 26, 2015, 03:10:01 am
content: I found out that I can stitch and connect planes by taking a trace and going through it, but it must be connected to some pin to give it a trace id, otherwise it will insulate itself into a unconnected track.

author: DrMag
author_rank: Regular Contributor
timestamp: January 26, 2015, 03:34:22 am
content: Look for the highlight tool; it appears in the right toolbar under the basic arrow tool. (Assuming your installation isn't configured differently than the default, anyway.) With that, simply click on anything connected to ground and it'll highlight the net for you.Another way to do the stitching is to start a wire after the fills are poured. You don't need to trace any wires out and can simply place vias. However, the current stable version has a bug, and after certain actions it'll reassign the nets on the stitch vias, so it should probably be the last thing you do before plotting out the gerbers.

author: Dajgoro
author_rank: Frequent Contributor
timestamp: January 26, 2015, 12:41:10 pm
content: QuoteThat works for nets, but won't work for fill areas.QuoteThat works, but if I do a refill it breaks. So I can't touch anything without breaking those vias.
KiCad loses connections when importing netlist to PCBnew - Page 1
Forum section: electronics / projects

author: hummusdude
author_rank: Regular Contributor
timestamp: April 04, 2021, 06:19:54 pm
content: My design has a couple of 7 segment displays that will be mounted on the front panel of the enclosure. I'm using a 2x9 mail pin header on the PCB as a connection point which I plan to wire to the displays. But when I import the netlist to PCBnew none of the connections to J4 (the pin header) are there. When I create the net list there are no errors, nor are there any errors when I run the rules checker in EEschema. All the rest of the connections look good, but just not to the pin header.The footprint of J4 reads: Connector_PinHeader_2.54mm:PinHeader_2x09_P2.54mm_Vertical. KiCad version is 5.1.5 -3.And in PCBnew the pin header connector renders accurately as well.Could this be a corrupted footprint file? Is there a way to check or replace it from another source?

author: PeteH
author_rank: Unknown
timestamp: April 04, 2021, 06:25:22 pm
content: Should the pins not be just named (numbered) 1 through 18*? (Edit)Clarification: the footprint is probably "numbering" the pins 1 through 18. Trying grabbing a generically named schematic symbol from the library with the pinout sequence/order you desire. 1a, 1b, etc do not exist in the footprint

author: hummusdude
author_rank: Regular Contributor
timestamp: April 04, 2021, 06:48:59 pm
content: That worked! I changed the schematic symbol to something with only numbers and the import worked fine.Many thanks for the tip!!

author: retiredfeline
author_rank: Frequent Contributor
timestamp: April 08, 2021, 05:23:13 am
content: Couple of comments:Latest stable is 5.1.9.You don't need to export a netlist file in eeschema and import in pcbnew, you can use the menu action Update PCB (F8), even for the first import.

author: hummusdude
author_rank: Regular Contributor
timestamp: April 08, 2021, 06:25:21 am
content: Good to know...thanks!
KiCad one schema, multiple layouts? [SOLVED] - Page 1
Forum section: electronics / projects

author: onesixright
author_rank: Frequent Contributor
timestamp: June 13, 2016, 09:15:48 am
content: For the life of me, i can't figure out how to create two PCB's (or more) layouts based on one Schema.Running KiCad 4.xAnyone has a clue?Much obliged!

author: madires
author_rank: Super Contributor
timestamp: June 13, 2016, 09:30:07 am
content: Copy the project and create a PCB for each project?

author: onesixright
author_rank: Frequent Contributor
timestamp: June 13, 2016, 09:36:28 am
content: Quote from: madires on June 13, 2016, 09:30:07 amYeah that came to mind, but if you change the schema. You need to do it twice.Im designing a circuit for a THT and SMD layout. So one schema, 2 layouts

author: Wilksey
author_rank: Super Contributor
timestamp: June 13, 2016, 09:53:41 am
content: I haven't tried it, but you could try creating the default (say THT) PCB within the project, open PCBNEW.exe (from the KiCAD install), create a new PCB based on the netlist from the project, save the (presume SMT) PCB into the project folder, then you should, in theory, have both PCB's within the project.I don't think KiCAD has back / forward annotation so I don't think you will sever any links between them, it all used to be done by manually importing the netlist.Try it!

author: onesixright
author_rank: Frequent Contributor
timestamp: June 13, 2016, 10:14:46 am
content: Well, found it. Not sure if its logical, but you basically open the layout, then then goto File -> Save As.That essentially makes a copy (.kicad_pcb).Thanks for the help!

author: Thor-Arne
author_rank: Unknown
timestamp: June 13, 2016, 01:25:44 pm
content: I'm not sure this will work as KiCad stores the footprints in the schematic file (F2 field) in addition to in the netlist file.Code:$CompL CP C1U 1 1 555F3EC3P 2600 5650F 0 "C1" V 2650 5750 40 0000 L CNNF 1 "22uF Tan" V 2550 5350 40 0000 L CNNF 2 "Caps_SMD:cap_smd_tant_C" H 2600 5650 60 0001 C CNNF 3 "" H 2600 5650 60 0000 C CNN1 2600 56501 0 0 -1$EndCompIn addition there is a major refactoring is going on with the eeschema code, so these kind of workarounds might not work in the future.Also, this post should be inGeneral PCB/EDA/CAD Discussions » KiCad.

author: onesixright
author_rank: Frequent Contributor
timestamp: June 13, 2016, 01:28:23 pm
content: @Thor-ArneI got it (see message).Any moderator that can move this to the correct folder (sorry didn't realise that)?
KID-R480A BGA Rework Station PCB References - Page 1
Forum section: electronics / projects

author: offline
author_rank: Contributor
timestamp: September 09, 2019, 08:46:23 pm
content: This thread is going to be a complete breakdown of everything about the KID-R480A BGA Rework Station.Power Relay Board ComponentsBTA41-600BBTA20-600BHELISHUN HLS T78 DC24Vcosmo 3063x30 uf090ss26 diodeP6KE22 diodeCNR-10D431Ksmd 222 = 2.2kohm 1206smd 103 = 10kohm 0805smd 181 = 180ohm 1206smd 152 = 1.5kohm 0805smd 472 = 4.7kohm 1206resistor network 103smd capacitor

author: offline
author_rank: Contributor
timestamp: September 09, 2019, 10:17:01 pm
content: The ARM microcontroller Is this a two layer pcb? it has two memory chips, I would like to dump the contents of these two devices.Can anybody help me figure out how?ATMLU130 ATMEL Memory EEPROMST M29W128GH NOR FlashI have one of these, can't seem to find a datasheet for ATMLU130

author: Renate
author_rank: Super Contributor
timestamp: September 11, 2019, 08:30:18 pm
content: I think that it's a normal I2C EEPROM, like 24C32???Are those bare boards boards that you stripped???
Kikusui PAD300-1A DC supply schematics - Page 1
Forum section: electronics / projects

author: TerraHertz
author_rank: Super Contributor
timestamp: May 29, 2016, 02:02:48 am
content: I've had a couple of Kikusui PAD300-1A DC supplies (0 to 300V DC, 1A) for a while, but couldn't find schematics online.The manual as an English language pdf is online from Kikusui here:http://www.kikusui.co.jp/kiku_manuals/P/PAD300_1A_E2.pdfHowever although it lists schematics in the index, they are missing.I recently found an original paper manual, in Japanese although it *does* have schematics.The Japanese text seems to match the English manual, ie the English one is a direct translation.So here are the scanned schematics:Sheet 1 is chassis wiring and several small PCBs.A poor quality print, that I've cleaned up as best I can.It refers to other diagrams:* A-075 (linear regulator control)* A-004 (pre-regulator phase control)Sheet 2 is of PCB A-075. Better print quality.The schematic for PCB A-004 is not present in my manual, and never was. Apparently they chose not to include it.Anyway some schematics is better than none.Just posting here so they are findable online, in case anyone else needs them. Zip, 495KB.
Kill-A-Watt Clone Viewing Angle Off (Large Screen)  - Page 1
Forum section: electronics / projects

author: robert574
author_rank: Newbie
timestamp: January 23, 2022, 12:09:47 am
content: Hey, I just received my new(est) kill-a-watt clone meter. I bought one with the newer large, backlit screens. The issue is that you can hardly see it looking straight at it and the viewing angle is down about 25 degrees. It's a real problem if you plug it into a low outlet and have to lay on the floor to read it.Has anyone else had this issue and figured out a fix for it? And yes. I also just noticed the reset button in the center front in the picture (I'll try it).

author: edpalmer42
author_rank: Super Contributor
timestamp: January 23, 2022, 05:48:27 am
content: I've always found the Kill-a-Watt to be a pain to read when it's plugged into the outlet. I almost always use an extension cord or power bar to bring it up to me rather than me crawling down to the outlet. If you're working with a heavy load, use a heavy cord.Ed

author: robert574
author_rank: Newbie
timestamp: January 23, 2022, 04:01:53 pm
content: The only reason I bought this unit was because it has a backlight so I could see it easily. I have to use a flashlight with my older unit. (sigh) I tried the reset and it didn't help of course.I assume there's no way to adjust it, that the contrast and viewing angle are all part of the screen. I looked at a number of them on youtube and it doesn't look like any of them have this problem.Edit: After some more reading, it looks like the bias angle (center of the viewing angle) is preset for the display. The viewing angle is +/- degrees from the bias angle. There's not much I can do with this to improve it except to look for an angled outlet adapter maybe.

author: edpalmer42
author_rank: Super Contributor
timestamp: January 23, 2022, 05:03:00 pm
content: It would be a lot of work, if it's possible at all, but some LCDs can be disassembled. Then you could rotate the polarizing sheet which would rotate the viewing angle.It's also possible that there's an internal contrast adjustment, but I wouldn't hold my breath.Ed
Kind of DIY SmartWatch - Page 1
Forum section: electronics / projects

author: godFather89
author_rank: Contributor
timestamp: October 06, 2014, 11:04:09 am
content: Hello,I was thinking of building a BLE enabled smart watch (need a new project to keep me busy during spare time).Some specs:-Cortex M0+, KL15Z128 (16KB RAM, 128KB Flash) - I have a bunch of these around and they can achieve really low power consumption;-96x96 Sharp memory LCD, LS013B4DN04 - The only one I have. I find them pretty hard to find. It would've been better a bigger resolution one;-BLE Module: RF-BM-S02. The smallest form factor I could find (but still DIY friendly) and the cheapest I found on ebay. I hope I won't have to roll out my own firmware for the CC2540 to keep the power consumption to a minimum;-external RTC - I was thinking of using PCF8523 to also generate the VCOM signal for the LCD and keep the main mcu as much as possible in sleep mode but I'll have to think some more about this;-Vibrator motor (for notifications sent from the phone);-Accelerometer (MMA8451Q) - just because it's cheap, very low power and doesn't occupy much space (use it to flip screen or control music);-small Li-Ion charger (I guess it will have some 100-200 mAh battery, or a CR2032 cell);-4 push buttons (Pebble style);-some sort of a case, maybe a 3d printed one;-PCB not bigger than the LCD (maybe 1-2mm). I'll try to fit everything on a 2 sided PCB.The flash of the microcontroller is a bit small (for fonts/graphics). Not sure if I should include an external spi/i2c flash.Sw features (ordered by priority):-clock (with easy to implement watch faces);-call, sms, email notifications;-music control (volume, play/pause, next/prev track);-weather info-some other things... (auto sms reply when call declined)The goal is to create an open source/open hardware design (including the android app), similar with Pebble, that can be fully customized by any one.What do you think? What other features would be useful?Andrei

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 06, 2014, 08:39:17 pm
content: If you're not going to use a standard micro USB connector for charging, just have the charging port connect to the battery and put the actual charge controller in the adapter or cable.

author: godFather89
author_rank: Contributor
timestamp: October 07, 2014, 06:25:24 am
content: I was thinking of using micro USB and use the 2 data pins as programming Data/Clock so I can use a custom USB cable for programming and any standard USB cable for charging.
Kinetis K20 80 pin Clock Question - Page 1
Forum section: electronics / projects

author: mtechmatt
author_rank: Regular Contributor
timestamp: November 13, 2013, 06:53:25 pm
content: Hi everyone...Tech question...We want to run Freescale Kinetis K22 at 120MHZ, which it can do, but the the only XTAL pins on the device are the XTAL32 (for RTC)... Can the FLL/PLL really clock up from this to 120MHZ or am I seeing something wrong?datasheets:http://cache.freescale.com/files/32bit/doc/ref_manual/K22P80M120SF5RM.pdf?fpsp=1&WT_TYPE=Reference%20Manuals&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=DocumentationAny help much appreciated!Matt

author: dciliske
author_rank: Newbie
timestamp: November 14, 2013, 10:53:09 pm
content: The primary oscillator input is XTAL0 (pin 41) and EXTAL0 (pin 40). You'll find it listed in the pinout table on page 229 of the linked manual.
Kit-on-a-Shield for Arduino   video by MJLorton - Page 1
Forum section: electronics / projects

author: ez24
author_rank: Super Contributor
timestamp: October 25, 2016, 06:16:04 am
content: Looks like MJLorton has not gone away (via some previous posts)Here is a recent video by MJLorton on "Kit-on-a-shield" for Arduino. Seems like a good idea:Here it is on Amazon:https://www.amazon.com/Programming-Electronics-Academy-V1-Arduino/dp/B01BNSNEZ0/ref=sr_1_1?ie=UTF8&qid=1477375350&sr=8-1&keywords=kit+on+a+shield+for+arduinoOne dumb ass question: could the Arduino (the Uno) and this be used with AVR-C ? In other words could they be used without the Arduino IDE ? This seems to be a good way to learn coding without breadboarding. Another simple good idea.Excuse me if this has already been posted.

author: FreddyVictor
author_rank: Regular Contributor
timestamp: October 25, 2016, 07:49:57 am
content: not tried this, but I'm guessingCodeblocks for Arduinocan be used<edit> actually, this is just a nicer Arduino IDEI have used the std version ofCode::Blocksbut it needs some extra commands in the post-build step to flash the Arduino
Klein ET310 How does it work? - Page 1
Forum section: electronics / projects

author: rcbuck
author_rank: Frequent Contributor
timestamp: July 11, 2022, 10:06:41 pm
content: https://www.kleintools.com/videos/digital-circuit-breaker-finder-gfci-outlet-tester-et310It actually works. I bought one since I am doing some house rewiring. I plugged it into an outlet inside the house. Went outside to breaker panel and scanned the breakers. When it located the breaker it started flashing and the LED turned red.When all of the breakers are on they connect to the common bus phase of the incoming electric source. This means they are all connected together on one end of the breaker. There should only be a couple of milliohms contact resistance. Why doesn't it indicate red on all the breakers?

author: rcbuck
author_rank: Frequent Contributor
timestamp: July 12, 2022, 03:42:36 am
content: Thanks for the reply. The AC injection sounds like what they are doing. It would be fairly easy to generate a 100 or 200 kHz signal with only a couple of components. I may be able to use my spectrum analyzer to pick up the signal to determine the frequency they are using.
KMY Electrolytic Cap, 47uf 50V with 1(K) and 2W Markings - Page 1
Forum section: electronics / projects

author: daveyk
author_rank: Frequent Contributor
timestamp: September 19, 2020, 01:05:03 am
content: What does 1(K) and 2W mean on an electrolytic cap with a value 0f 47uf @50V? This is a KMY brand (not sure who they are)

author: wraper
author_rank: Unknown
timestamp: September 19, 2020, 01:15:10 am
content: Most likely it's Nippon Chemi-Con KMY series. The rest is date/lot code.

author: daveyk
author_rank: Frequent Contributor
timestamp: September 19, 2020, 01:42:32 am
content: Thank you; I thought was strange ratings for a cap! - lol
Knit - a WiFi breakout which supports Eclipse, gcc and OpenOCD - Page 1
Forum section: electronics / projects

author: anuj
author_rank: Newbie
timestamp: March 14, 2016, 11:20:39 am
content: Me and a friend are working on a WiFi board called Knit which is a beast, courtesy of the onboard Marvell Semi 88MW300 SoC.Would love feedback from the communityhttp://makerville.io/knitSome of the features -- 32 bit Cortex M4F at 200Mhz- 512k SRAM- 4MB flash with Execute in Place support- ADC, DAC, GPIO, GPT, SSP, I2C, UARTs, etc.It will be run with the most popular embedded development tools- FreeRTOS- Arm GCC toolchain- OpenOCD debugging- Eclipse IDE- lwIP for the IP stackThe SDK is made available on Marvell's GitHub :https://github.com/marvell-iot/aws_starter_sdkThe drivers are released as a blob, so is the wifi firmware and bootloader. But in my opinion there is more than enough to do serious development using all the above tools and resources.One of the interesting things that have been made using the module that we are using is the Hello Barbie :http://www.somersetrecon.com/blog/2015/11/20/hello-barbie-security-part-1-teardownAnd since it's a module based design we have FCC, IC, CE certifications too.Sign up if you'd love to get updates :http://makerville.io/knit/#signupCheers !

author: anuj
author_rank: Newbie
timestamp: March 14, 2016, 11:24:00 am
content: Forgot to mention, we are open sourcing the PCB files too -https://github.com/Makerville/knit/tree/master/hardware