hybridfree/eevblog-posts huggingface dataset:
Are there any "up to date" comparators allowing user-selectable hysteresis? - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: July 17, 2019, 09:25:53 am
content: Nowadays we have a huge choice of op-amps, which are still used in the same way as older types.I notice many comparators these days have some small fixed (and sometimes un-specified) hysteresis. This is useful in some instances. Looking at LT's swathe of offerings, it seems most are this type in fact (?)What are typical part numbers for those comparators allowing traditional "user-defined feedback" from output to a divider at the '+' input? Is it still basically the old LM393? Are there now CMOS versions, maybe even some with open-drain etc?

author: 741
author_rank: Frequent Contributor
timestamp: July 23, 2019, 09:21:04 am
content: Had a look a Microchip and Texas.For reasons unknown, R2R output implies internal hysteresis.I'd really like R2RIO, user-settable hysteresis.The application would benefit from wide input common-mode range. Having R2R output makes hysteresis feedback design more satisfactory because the design is symmetrical and I can regard a low output as placing feedback resistor "RF" in parallel with lower divider resistor, and a high as placing RF in parallel with the upper divider resistor.

author: tautech
author_rank: Super Contributor
timestamp: July 23, 2019, 09:27:55 am
content: Application ?Required package ?

author: magic
author_rank: Super Contributor
timestamp: July 23, 2019, 10:25:27 am
content: Quote from: 741 on July 17, 2019, 09:25:53 amOf course you can do it even if there is internal hysteresis, although you cannot disable internal hysteresis if it's present.Quote from: 741 on July 23, 2019, 09:21:04 amPerhaps a measure against output stage crossconduction if you do something stupid like apply negative feedback to continuously keep the output at 50% / oscillating around 50%.

author: Marco
author_rank: Super Contributor
timestamp: July 23, 2019, 12:23:52 pm
content: LTC6752? You pay for it though.

author: scuzzyTerminator
author_rank: Regular Contributor
timestamp: July 25, 2019, 06:37:51 pm
content: Might these work for you?Rail-to-Rail, Very Fast, 2.5 V to 5.5 V,Single-Supply TTL/CMOS ComparatorsADCMP600/ADCMP601/ADCMP602(Single-pin control for programmable hysteresis and latch)https://www.analog.com/media/en/technical-documentation/data-sheets/ADCMP600_601_602.pdf
Are there connectors for double sided flat flex cable - Page 1
Forum section: electronics / projects

author: Electr0nicus
author_rank: Regular Contributor
timestamp: December 09, 2015, 03:03:09 pm
content: HiFor a current project I have a double sided flat flex cable with 1mm pin pitch and independend circuits top and bottom. Now I have searched for a connector for double sided flat flex. Apart from some exotic products, which are nearly impossible to buy in <10 pcs. quantity, I didn't find something. Are there any connectors for double sided flat flex form the big connnector companies, which are easy to source?CheersGregor
Are there Fake DS18B20 senors around - Page 1
Forum section: electronics / projects

author: BMK
author_rank: Regular Contributor
timestamp: December 11, 2015, 03:37:09 pm
content: Back in 2012 when I was building a new house, I decided I would 'Sensor the shit out of it'.Among these sensors I had about 60x DS18B20 sensors. Through these sensors I intended to be able to measure room temperatures, temperature of floor slabs heated by UFH, solar panels, thermal store, wood stove,oil boiler, attic.... you get the idea. I found on eBay (I know, I know..) some DS18B20 sensors already in a nice epoxy filled stainless jacket. These were ideal, I thought -some are even buried in the soil 30cm under my house...So this week I finally hooked them all up and began to read the temperatures. Some of the room temp measurements are off by as much as 5 degrees vs the same thermometer. Simultaneously Putting a few of them in a bath of water at 20'C I see everything from 18' to 23'.Am I expecting too much of these sensors. My reading of the data sheet is that absolute accuracy is +/- 0.5'CHas anybody seen fake DS18B20 sensors?Does anyone here want to have a go at de-capping some of these?
Are there freely available frequency standard sources for calibration? - Page 1
Forum section: electronics / projects

author: jmc2000
author_rank: Contributor
timestamp: May 01, 2013, 04:35:02 pm
content: In the news a few days back, there was an article on how a pulsar system confirmed Einstein's theory of relativity:Record-breaking pulsar confirms Einstein's theory of general relativityhttp://www.wired.co.uk/news/archive/2013-04/29/general-relativity-confirmationThe really interesting part for me is the accuracy of some pulsar systems approaches that of atomic clocks, which would be great if this standard could be transmitted on some radio frequency. There again, maybe there are other frequency standards universally available in others ways, so do you guys know of any, and their accuracy, stability etc?

author: kfitch42
author_rank: Frequent Contributor
timestamp: May 01, 2013, 05:14:45 pm
content: Google for "GPS Disciplined Oscillator" or WWVB, I think the Brits have their own equivalent of WWVB (NBS or something like that).

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 01, 2013, 05:19:15 pm
content: http://ac6v.com/standard.htm
Are there SMD LED chips similar to WS2812 but smaller and monochrome? - Page 1
Forum section: electronics / projects

author: VinzC
author_rank: Frequent Contributor
timestamp: April 27, 2016, 08:55:14 am
content: Hi all.I've known about Sparkfun'sWS2812and I think I'll use it for one of my projects. I have another project in which I'll be managing an arbitrary number of LEDs without requiring port expander or any circuitry so having them wired in series like the WS2812 is the perfect match. The problem is I only know of the latter item and I don't necessarily need it to be RGB, monochrome fits as well — e.g. blue or white or yellow. Also the WS2812 is 5mm "wide" and I'd like something smaller, like 3mm or 4mm. Do you know if such a beast exists?Thanks a lot in advance.

author: Fungus
author_rank: Super Contributor
timestamp: April 27, 2016, 09:16:34 am
content: Quote from: VinzC on April 27, 2016, 08:55:14 amNo, it doesn't, but you can get the WS2811 driver as a separate chip and use one chip for every 3 LEDs (the WS2811 driver chip is the little black speck you can see inside a WS2812 LED).I buy them onlittle PCBsso I can mix in ordinary LEDs with RGB LEDs from WS2812 strips - just connect them all together and it works.

author: VinzC
author_rank: Frequent Contributor
timestamp: April 27, 2016, 02:51:55 pm
content: Quote from: VinzC on April 27, 2016, 08:55:14 amQuote from: Fungus on April 27, 2016, 09:16:34 amThanks for the info. I suspected that it didn't after a couple of searches. The goal is to reduce the number of additional circuitry to zero. I think I'll do with WS2812 anyway as it's still quite good as it is. I'll just downgrade my requirements.

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 30, 2016, 04:56:05 am
content: Quote from: VinzC on April 27, 2016, 08:55:14 amYou can get something that is smaller, the SK6812 is available in a 3535 package.

author: VinzC
author_rank: Frequent Contributor
timestamp: May 01, 2016, 12:55:13 pm
content: Quote from: VinzC on April 27, 2016, 08:55:14 amQuote from: PeterFW on April 30, 2016, 04:56:05 amAwesome! Thanks!
Are there standard circuits for small sig bjt noise measurements? - Page 1
Forum section: electronics / projects

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 15, 2016, 04:21:30 am
content: I usually use the amplifier circuit in question, or dummy a similar one up, to use for selecting transistors. There's a dearth of practical material online or in my library about standard methods. Are there any preferred circuits for setting up the DUT for a generic noise measurement? I have the following amp and filters under control, but just need to know the best DUT configuration.

author: EmmanuelFaure
author_rank: Regular Contributor
timestamp: December 16, 2016, 08:23:46 pm
content: Measuring the noise from a single bjt is not an easy job. With a common emitter topology, any noise at the base biasing divider appears at the output. Here's attached a schematic fromThe Art of Electronics, 3rd edition.I recommend using a battery as the power supply to minimize "PSRR" induced noise, biaising divider must be made from high stability resistors, kept at constant temperature as much as possible.Measuring the noise from a (quite) matched pair is easier. Supply noise and bias divider noise appears as common mode and are rejected.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 16, 2016, 08:41:08 pm
content: Thanks! I have TAOE 2nd edition, but not 3rd. I haven't had much trouble with simple circuits and ordinary metal film resistors, but I may build this one up as a dedicated fixture.

author: EmmanuelFaure
author_rank: Regular Contributor
timestamp: December 17, 2016, 06:23:04 pm
content: If your frequencies of interest are in audio band, you do not need highly stable resistors nor an highly complicated measurement circuit. My comment and the schematic from TAOF was in perspective of an use in instrumentation, where low frequency performance matters. Imagine that you bias the base at mid point, and that supply voltage is 10V : Each ppm of resistor variation results in a 5µV "noise" at the base. Such variations at low frequency happens to be induced by TCR + local temperature changes.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 17, 2016, 06:39:14 pm
content: I did wonder about that, as my interest is indeed the audio band. They seem to have paid a lot of attention to filtering for very low frequencies, that I didn't find necessary. I also find a great sensitivity to source impedance, and should probably try to understand the math better. No idea what base spreading resistance is, but the topic seems to come up in noise discussions as well.
Are these 4.5V the kind that come from a dual power supply ? - Page 1
Forum section: electronics / projects

author: Hextejas
author_rank: Frequent Contributor
timestamp: April 02, 2018, 01:34:35 pm
content: I wanted to build this op amp tester and I am stuck before I even started. I see the 4.5+ and 4.5- and wondered if I had to use my dual voltage power supply or can I just use a 9V battery.Then I also noticed that the tle2426 and the op amp did not have the pins marked. The data sheet for the 2426 only has 3 active pins. In, out, and common.i have not seen common before.So, I am stuck.

author: Twoflower
author_rank: Frequent Contributor
timestamp: April 02, 2018, 01:44:32 pm
content: No, that circuit is battery powered. It uses a 9V battery. The TLE2426 'generates' a virtual ground. Relative to that ground you have +4.5V on the positive battery terminal and -4.5V on the negative battery.Simplified the TLE2426 is a voltage divider with two identical resistors. The center tap is used as virtual ground.
Are these buck converter waveforms OK? (LTspice simulation) - Page 1
Forum section: electronics / projects

author: exscape
author_rank: Contributor
timestamp: March 08, 2018, 09:02:37 am
content: I'm working on a high power (~60 W) white LED driver. I might even be done with it (PCB layout remains, but nothing else) -- except I noticed some worrying things in my LTspice simulations.I've never worked with DC/DC converters prior, so all I know is what I've learned while working on this for the past few weeks.I'm using theLT3755-2 LED driver controller.Here's the schematic, and the waveforms when dimmed low (in DCM, I assume):Gate voltage and inductor current:Diode current (positive = forward conduction)MOSFET IdsThe reverse current spikes through the diode are just under 4 ns long. Are they real, or a simulation artifact? If real, are they a problem?When the dimming voltage is higher (load current between about 0.4 and 4.5 A), the waveforms look roughly like this (screens are at 100% dimming):Load and inductor current:Diode current:MOSFET Ids:My worries are:1) The negative inductor current when ringing (in DCM)2) Negative current spikes through the diode when switching (DCM and CCM)3) Negative current through the MOSFET while ringing (in DCM)Are all of these OK? If not, how should I work to solve them?This is a hobbyist project, so EMI isn't a huge issue; however, I'm doing this to learn, so I'd of course prefer the design to be at least acceptable from an EMI standpoint.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 08, 2018, 11:34:37 am
content: The controller seems to be doing what it's supposed to.If you don't want such sharp edges, try some gate resistance. I don't get why LT never shows them; their FAEs are pretty hopeless when it comes to EMI as well.I don't get why the thing needs two current senses. You already know one from the other. Not a very smart controller design on their part.The critical layout loop is between R2, Q1, D1 and C5. Cram them together as close as possible, connected with as much trace width as possible (usually with polygons/pours).BTW, look up the capacitance drop vs. voltage for any large ceramic caps you're using.Tim

author: Benta
author_rank: Super Contributor
timestamp: March 08, 2018, 11:45:20 am
content: Looking at the data sheet, it doesn't seem that LT intended the part to be used the way you are...

author: exscape
author_rank: Contributor
timestamp: March 08, 2018, 01:28:26 pm
content: Quote from: Benta on March 08, 2018, 11:45:20 amHmm, in what way? Do you mean using only analog dimming, or something else?The circuit is based on the "Buck mode 1.4 A LED driver" circuit on page 20, only simplified as I'm not interested in using PWM dimming.

author: Wimberleytech
author_rank: Super Contributor
timestamp: March 08, 2018, 03:04:40 pm
content: Quote from: T3sl4co1l on March 08, 2018, 11:34:37 amThe controller can be configured in multiple ways. In at least one configuration the two current-sense paths are independent.
Are these displays some kind of transparent OLED? - Page 1
Forum section: electronics / projects

author: sswift
author_rank: Contributor
timestamp: May 10, 2018, 11:25:53 am
content: https://twitter.com/S_even_S/status/994149767641890818These seem way brighter than any transparent OLED I've seen on Alibaba and they appear to have a fixed pattern to the display like certain types of LCD screens and simple LED displays, so I'm thinking they might be some new technology, though what they are exactly, I'm not sure!Any idea what these are called, how they work, and where one can source them?

author: JJalling
author_rank: Unknown
timestamp: May 10, 2018, 12:52:47 pm
content: They (Greddy) says that It's thin-film electroluminescent displays.BR Jonas

author: sswift
author_rank: Contributor
timestamp: May 10, 2018, 01:50:08 pm
content: EL? Aww... that's a shame. They're probably not as bright as they appear and require those noisy inverters. I bought some EL tape recently and it looks great a night but during the day even indoors it's hard to tell if it's lit.Though all the EL tape I've ever seen is cyan by default and all the other colors are achieved with filters. This clearly does not use a filter, and it's yellow, so perhaps it's more efficient?

author: wraper
author_rank: Unknown
timestamp: May 10, 2018, 02:29:03 pm
content: Quote from: sswift on May 10, 2018, 01:50:08 pmDon't compare apples and oranges. EL displays are quiet bright. As of outdoor visibility, certainly better than average LCD.

author: jeduffy
author_rank: Contributor
timestamp: May 10, 2018, 05:10:13 pm
content: Recently started being carried by sparkfun:https://www.sparkfun.com/products/14691
Are these magnetic drive pump specifications realistic? - Page 1
Forum section: electronics / projects

author: CopperCone
author_rank: Super Contributor
timestamp: May 15, 2018, 04:19:45 pm
content: I like the little giant magnetic drive pumps but their pressure is very low.I am looking for high corrosion resistance.I want something capable of maybe 30 lpm at 50 psi or about 120 head.I would like it to be cheap and driven by a 90vdc motor.I figure thisdoes not exist. I believe i am mechanically capable of connecting a pump to a motor of my choice by a belt. I would actually prefer this because i can isolate motorheat and cool things better.Is the pump part realistic at least? All the magnetic drive pumps i see have pressure thats like less then 10 psi.Are these requirements insane?

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: May 15, 2018, 05:00:50 pm
content: 120 what of head? mm, you're OK, miles, you're in trouble. Just guessing, the coupling is good, but it's still a centrifugal pump and is going to have trouble getting high pressure. You might be able to work out the capacity based on HP. Maybe you could run two in series?

author: CopperCone
author_rank: Super Contributor
timestamp: May 15, 2018, 07:00:48 pm
content: 120 feet, 50 PSI, 40 metersMy suspicion is that i need a gear pump.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: May 15, 2018, 11:48:56 pm
content: Based on some online calculators, those numbers suggest you'll need about 12 HP!

author: CopperCone
author_rank: Super Contributor
timestamp: May 16, 2018, 12:09:06 am
content: Quote from: Conrad Hoffman on May 15, 2018, 11:48:56 pmCan you link what you used?It's a shame,https://www.grainger.com/product/DAYTON-Rotary-Gear-Pump-6DHH9only 1/3 HP.. but its a cast iron gear pump

author: Ian.M
author_rank: Super Contributor
timestamp: May 16, 2018, 12:27:18 am
content: 50 PSI is fractionally over 35 m of water head (assuming pure water @ 1 Kg/l)30 l/m is 0.5 l/s so 0.5 Kg raised 35+ m every second. From P=M*g*H, that's slightly over 172 Joules/sec of useful work done. As a properly matched impeller pump typically has an efficiency in excess of 50%, 345 W mechanical power should be sufficient provided the pipe diameter is large enough that frictional losses are slight. A 1/2 HP motor and pump should handle it.However, with the exception of positive displacement pumps, flow and pressure tend to be quoted as limiting values, flow at zero head, so minimum back pressure and pressure at zero flow. Therefore you need to be starting your search of pump catalogs with ones rated for about 100 PSI and 60 l/m

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: May 16, 2018, 11:16:18 am
content: Yeah, that 12 HP number seemed really high. Comparing this to my basement sump pump, the pump is 1/2 HP and is rated for (converted) 242 lpm at 3 m lift height.

author: tecman
author_rank: Frequent Contributor
timestamp: May 20, 2018, 02:11:57 pm
content: 30 l/m ( 8 GPM) at 50 psi is 0.23 HP, w/o pump efficiency (P * Q / 1714 = HP). So slightly over 1/4 HP is all you need. A centrifugal can give you these requirements.paul
Are those XT150 connectors? - Page 1
Forum section: electronics / projects

author: Zucca
author_rank: Unknown
timestamp: January 21, 2023, 02:43:39 am
content: Hi I just found them in my DC connector bin.I am looking for XT150 connectors, those ones I have are a little be off in dimensions from the drawings I find in internet.Can you help me to understand if they are XT150 connectors or not?Thanks!

author: bidrohini
author_rank: Regular Contributor
timestamp: January 22, 2023, 07:51:44 am
content: Quite similar, but I don't think they're the same.

author: Zucca
author_rank: Unknown
timestamp: January 24, 2023, 03:27:27 am
content: That's exactly what I thought...Meh I will give it a try and I let you know....
ARGH CONNECTOR NIGHTMARE!  240VAC >12A, PCB mount, bulkhead RA ?? - Page 1
Forum section: electronics / projects

author: max_torque
author_rank: Super Contributor
timestamp: August 02, 2019, 01:46:13 pm
content: Ok, can anyone help me find such a mythical beastI really need a direct to PCB connector, that can carry single phase 240VAC, at up to 15A, and be in a right angled bulkhead type configuration, ideally positive locking and finger safe too! Not too much to ask is it??Something like a Powercon would be perfect, but with pcb tails?I'm trying to avoid having to do any point to point wiring inside a power distribution device, that has a pcb with various SSRs/relays on it, and needs to spit out power on command to various (around 10) outputs. The alternative is to use fastons or threaded tags to a short length of wire to each connector, but i'd REALLY like to avoid having to do that....

author: Kjelt
author_rank: Super Contributor
timestamp: August 02, 2019, 04:13:14 pm
content: If the powercon is perfect why not add 3mm bolts or standoffs to your pc and solder the contraconnector which is a simple cheap connector to the pcb? I have seen this done before with big current car relais.

author: max_torque
author_rank: Super Contributor
timestamp: August 02, 2019, 05:33:09 pm
content: I'm trying to simplify the build process. The pcb sits inside an enclosure that assembles into a larger unit, and i need connectors to allow that part to be easily removed / swapped, but i want to minimise the amount of (hand fabricated for this proddy volume (<50 units)) point to point wiring that is required, hence anything that can go straight to pcb should do that, and not go via a link harness or similar.The incoming power will have to go via a small loom, because it goes via an isolator switch and MCB device, and it will likely arrive onto the pcb through some of those solder-on threaded little metal tabs eg:But with 8 power feeds coming off the pcb, it will be better to try to get direct to pcb connectors!

author: fcb
author_rank: Super Contributor
timestamp: August 02, 2019, 05:42:26 pm
content: CLIFFCON FCR6929? (knockoff speakons)DIN41612?C19/C20 (IEC60320) - spades normally?C13/C14 - defo PCB rightangle, might do 15A at a stretchWurth REDCUBE?

author: fcb
author_rank: Super Contributor
timestamp: August 02, 2019, 05:48:17 pm
content: TOBY are good guys for low cost connectors in the UK.https://www.toby.co.uk/pcb-hardware/spade-screw-terminals/

author: max_torque
author_rank: Super Contributor
timestamp: August 03, 2019, 10:21:05 am
content: Those Cliffcons look like a winner! thanks!! Will order some and see how solid they are!
Arinc 429 Debug Tools Opinions - Page 1
Forum section: electronics / projects

author: rfdes
author_rank: Regular Contributor
timestamp: October 08, 2017, 02:03:28 pm
content: In the next month or so, I will be tasked to design a piece of hardware that will interface with an Arinc 429 system. Does anyone have any recommendations as to reasonable tools that are available for debugging protocol issues, etc?Are any of the available scopes on the market (with the internal protocol decoders) capable of Arinc decoding? I've heard that LeCroy has some hardware that will work.How about standalone USB to Arinc type of decoders?Your opinions and recommendations are welcome.ThanksJimrfdes

author: Neganur
author_rank: Unknown
timestamp: October 08, 2017, 06:04:55 pm
content: http://www.keysight.com/main/facet.jspx?k=Arinc&hasLuckySearch=true&pSearch=tnmSearch&pageMode=PD&lc=eng&cc=USno idea about LeCroy or Tek. Pretty sure there wasn't anything on the Saleaehttps://support.saleae.com/hc/en-us/sections/201990583-Supported-Protocols

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: October 08, 2017, 06:19:45 pm
content: From scopes I had:LeCroy WavePro 7000 series (and others) does ARINChttp://cdn.teledynelecroy.com/files/pdf/lecroy_arinc-429_datasheet.pdfAlso Keysight 3000X series as wellhttp://www.keysight.com/en/pd-2020334-pn-DSOX3AERO/a-d-serial-triggering-and-analysis-mil-std-1553-arinc-429-for-3000-x-series-oscilloscopes?cc=GB&lc=engARINC is simple enough to decode by hand if you are desperate. I have definitely made an ARINC-USB interface for some ATC heads - no idea where it is now. It worked fine using analogue multiplexers and current limiters.I remember seeing some "open source" attempts at 429.If you need compliance tester or bus exerciser then scope is the wrong tool to get.CheersLeo

author: rfdes
author_rank: Regular Contributor
timestamp: October 09, 2017, 06:35:55 pm
content: Thanks for the suggestions. Some of these solutions are 'top-dollar' solutions. I think I will try my hand at an open source solution. Are there any in particular that is recommended.Take care -Jimrfdes
Aristo Elektro - Page 1
Forum section: electronics / projects

author: Wytnucls
author_rank: Super Contributor
timestamp: June 13, 2015, 12:10:01 pm
content: Bought the Aristo Elektro template recently (5$). I replicate interesting circuits in a notebook.I wonder if anybody still uses anything like it for their circuit design or is it all done on the PC these days.I would also like to find out the easiest way to draw inductors with that tool, if anybody uses it.
ARM CPU + z80 GPUS? - Page 1
Forum section: electronics / projects

author: sirus20x6
author_rank: Contributor
timestamp: September 21, 2012, 02:16:09 am
content: So I've never ever done anything like this but I have this mad ideaand here is my progressFront:Back:Is this sane/doable? do you think I'll need any glue logic? I picked up a couple of ATF22V10C chips. which is atmels version of a gal22v10 but I don't think I'll have to use them.I've got to figure out chip select on the z80 side the video dac I have is a ADV7125 and that feeds a ad723aruz which is what the uzebox uses.

author: poptones
author_rank: Frequent Contributor
timestamp: September 21, 2012, 02:26:18 am
content: Why?

author: sirus20x6
author_rank: Contributor
timestamp: September 21, 2012, 02:34:55 am
content: for fun? and to learn ARM

author: Zad
author_rank: Super Contributor
timestamp: September 21, 2012, 02:44:46 am
content: Well it will be an adventure certainly! Although ARMs are plenty fast enough to bit-bang VGA and analogue video through simple resistive DACs.

author: sirus20x6
author_rank: Contributor
timestamp: September 21, 2012, 03:00:59 am
content: well i already have a 24bit dac and the video encoder chip. this will get me composite and s-video out.Anyone have an idea of how to clock all these chips? my ad723 requires 3.58mhz (NTSC frame burst) so the z80s will run at 6 times that for 21.48 and the ARM chip is 50mhz so 14 times 3.58mhz will get me 50.12mhz. I hear these shift registers top out at 25mhz which is perfect.
ARM Linux Drivers - Page 1
Forum section: electronics / projects

author: yanir
author_rank: Regular Contributor
timestamp: December 14, 2012, 08:18:29 pm
content: Hi, I'm working in a ARM project that will run a linux distro. I need to interface the ARM with a custom device I will design. If I wanted to communicated with my custom device via serial UART, how would I go about writing the drivers in linux. I have a background in software development, but I'm new to linux drivers and ARM. Any help or links would be appreciated.Thanks

author: nctnico
author_rank: Super Contributor
timestamp: December 14, 2012, 08:31:42 pm
content: If you connect the device to a UART of the ARM SoC then you won't need any drivers. They should be provided by the board support package. Writing your own driver isn't very difficult if you stick to character devices. Pick a free major number and then you can use read, write and ioctl to talk to the driver. There is a book called 'linux device drivers' which shows some of the basics but its not the ultimate guide because the driver model of Linux tends to change very quick which is a real PITA. I usually look for a driver from the kernel source which is close to what I want and use that as a template to develop from.

author: yanir
author_rank: Regular Contributor
timestamp: December 14, 2012, 10:25:46 pm
content: Thanks for the tip! I'll look into that. Sounds like it should be straight forward then.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 14, 2012, 11:07:33 pm
content: Quick question. Can you run Ardunio out-of-the-box with a raspberry pi?

author: Quiggers
author_rank: Contributor
timestamp: January 06, 2013, 09:26:36 pm
content: thats a quick unrelated questionbut yes you can run the arduino ide on a PI,just dl the linux arduino packagehttp://arduino.cc/en/Main/Software
ARM M3 Tool chain - Compiler/Linker/JTAG/OS - Page 1
Forum section: electronics / projects

author: sgpee
author_rank: Contributor
timestamp: December 07, 2010, 08:21:39 am
content: Masters,I have done some research on which low cost tool set I should use my Arm M3 project. (STM32)I am currently zooming in on Crossworks. Price is good, I hear support is good as well. In this context couple of questions:Current plan is to use:- Crossworks- Olimex JTAG (no trace, but I should be fine)- Free RtosDo you have any earth shattering comments about the selection?Also, is there any ARM focused STDLib out there with source and no strings? I am hesitant to use STDLib from GNU as I read it is big in size, I would much rather have some open source ARM optimized STDLib I could customize for my needs. (i.e. take out the APIs I don't use using precompiler headers etc.)Thanks,SGPEE

author: tyblu
author_rank: Frequent Contributor
timestamp: December 07, 2010, 08:42:45 am
content: For the "no strings" bit, pay attention to the open source licenses. GPL can ground your project.

author: sgpee
author_rank: Contributor
timestamp: December 07, 2010, 09:54:52 am
content: Great point.. If I don't use standard libs, there should be no risk right?Freertos license is not restrictive (I think, but I will double check) and if I don't use the stdlib but use something from Crossworks or other source, I should be fine. Whether the tools are GPL or not is really not relevant.Spgee

author: tyblu
author_rank: Frequent Contributor
timestamp: December 07, 2010, 12:43:25 pm
content: Many open source licenses aren't commercially restrictive. I know that the GNU GPL, as of 2 years ago, called for an entire program to be subsequently under the GPL if any linked part was under it. Microsoft (ok, maybe some media hound pawned it off on M/S) dubbed it a 'viral' license. I'm not sure if v3+ changed this. The LGPL certainly does.http://opensource.org/licenses/categoryOpinions concerning licenses vary widely, contradict, and are sometimes emotional for some reason. Maybe it's because it is difficult to fully understand all of the choices and their consequences, so we rely on gut feelings. Most of the licenses aren't very long, and they are worth reading (I 'suppose this means I should read them again, as it has been a few years). Consider it a good day's work!http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=100746

author: TheDirty
author_rank: Frequent Contributor
timestamp: December 07, 2010, 08:45:29 pm
content: I use Crossworks and recommend it.If you can afford it go for the J-Link as it supports both JTAG and SWD. If you want SWD with the Olimex you will need to get one of the Rowley adapters.
ARM RF stack choice? - Page 1
Forum section: electronics / projects

author: stuka11
author_rank: Newbie
timestamp: July 09, 2014, 04:37:13 pm
content: Hi Everyone,I'm working on a RF project. We need to implement low power communication between MCU-s, where MCU-s should be able to communicate P2P, and/or form a mesh network. We prefer ARM Cortex MCU-s and Keil development tools. We have to decide which protocol and which hardware to use.Which one to use ZigBee or 6lowpan. What about power consumption difference between those two. ZigBee has to have Coordinator Node(CN) and Router Node(RN) must be actively listening all the time, while 6lowpan doesn't require CN and RN, and isn't actively listening.We were looking at following hardware:- Freescale KW0x - it has great output power (+17 dBm), but doesn't have any stack implementation for it- Freescale KW2x - higher power consumption than KW0x, and no 6lowpan implementation- STM32w - only stm32w108hb has active status, but has RAM size to small to run COntiki, has SMAC and rf4ce support- TI CC2538 - can run Contiki, IAR required, only Zigbee Home support which isn't compatible with other zigbee standardsThe hardware should have to have output power at least +7dBm or +8 dBm, and sensitivity as big as possible.We don't need to use hardware mentioned above or have everything integrated on one chip, but we would like to avoid more expensive solutions like xbee.Does anyone have a suggestion which hardware and which protocol to use? Does anyone have any experience building something similar? Any information would be useful.Thanks in advance!

author: nctnico
author_rank: Super Contributor
timestamp: July 09, 2014, 05:17:52 pm
content: You are seeing things too much as one big problem. Break it up in parts! What if you take a generic Zigbee and/or 6lowpan stack and compile that using your favorite compiler with a controller which fits the bill.

author: eliocor
author_rank: Unknown
timestamp: July 09, 2014, 05:42:43 pm
content: Ember (Silicon Labs) chips?http://www.silabs.com/products/wireless/zigbee/Pages/default.aspx

author: stuka11
author_rank: Newbie
timestamp: July 09, 2014, 06:47:31 pm
content: Quote from: nctnico on July 09, 2014, 05:17:52 pmThat was the idea but we haven't find any stack that fits. There are a few like FreakZ from Freaklabs but they aren't complete or support only specific boarda. If you know any that is ready to use and can be put on any board please let me know.

author: nctnico
author_rank: Super Contributor
timestamp: July 09, 2014, 09:01:22 pm
content: Then change the code to work on a different board. That should take a day at most.
Array capacitors - how well matched are they? - Page 1
Forum section: electronics / projects

author: axemaster
author_rank: Contributor
timestamp: November 12, 2021, 05:58:16 pm
content: I'm building a circuit that requires quad well-matched capacitors, NP0, in the 50-500pF range. "Well-matched" means ideally within 2%. Each cap will be from a signal line to GND, so bussed caps are OK.I've looked at X2Y caps but they only provide 2 matched capacitors.I also looked at standard array capacitors, which do have 4-cap arrays. But, the datasheets don't say anything about the matching.Example digikey page:https://www.digikey.com/short/92m3q85qI will be using several thousand quad caps, so manual measuring and matching is not a viable option here...Does anyone have wisdom to share about this?

author: TimFox
author_rank: Super Contributor
timestamp: November 12, 2021, 06:49:39 pm
content: The Kemet data sheet for the C0G quads says nothing about matching. The only advantages they quote over singles is volumetric: i.e., they take up less board space.Obviously, they are not intended for matching tolerance better than the absolute tolerance, as opposed to some resistor networks.

author: wraper
author_rank: Unknown
timestamp: November 12, 2021, 06:58:16 pm
content: Quote from: axemaster on November 12, 2021, 05:58:16 pmThey don't specify matching tolerance at all. And according to my measurements of higher capacitance types (X7R, >=1nF) it's not better than taking 2 random capacitors from the same batch. IMHO just use separate capacitors with 1% tolerance, they are not that much more expensive than 5%, and most likely will be cheaper than a 5% array anyway.
ARS technologies & USB2ISA - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: December 13, 2017, 03:15:49 pm
content: Can I ask has anyone used ARS Technologies' 'USB2ISA' products or any other ARS Tech products? i.e.http://arstech.com/I'm finding these guys obtuse at best, and I wonder whether their products do inherently work but just have dodgy docs and support but that I can anticipate eventual success. Or maybe I'm simply 'barking up the wrong ... supplier'A.
Article in German Make:-Magazin: Oscilloscope as Vector Display - Page 1
Forum section: electronics / projects

author: calli
author_rank: Regular Contributor
timestamp: October 19, 2017, 10:00:39 am
content: Hi,my name is Carsten and I am addicted to scopes :-) Thanks Dave.You may have followed my way fixing a Hameg 205-2 here:https://www.eevblog.com/forum/repair/hm205-2-vs-bitscope-dso-look-ma'-no-pixels/msg898397/Short after that I started to experiment and now I have a printed article in the German Make:-Magazin! Part 1 of 2 and I am quite happy with the outcome.It is ten pages starting with basics to get images on your scope up to getting 3D animations on it. Of course I am using Blender fo this :-)Cheers,Carsten

author: calli
author_rank: Regular Contributor
timestamp: October 19, 2017, 11:56:28 am
content: The issue is now buyable in stores and here is some more information and videos:https://www.heise.de/make/links/1705016https://www.heise.de/make/artikel/Vektorgrafik-auf-dem-Oszilloskop-3850919.htmlCarsten

author: NivagSwerdna
author_rank: Super Contributor
timestamp: October 19, 2017, 12:00:23 pm
content: I'm being lazy...... can you tell me how it works... I assume there is an X and Y input... but how is intensity controlled? How does it avoid drawing lines between objects (something which is not possible on an Etch-A-Sketch for example?)

author: calli
author_rank: Regular Contributor
timestamp: October 19, 2017, 12:04:12 pm
content: There are Scopes (or vector displays, also Vectrex) which have a Z input for luminace.The way it workswithoutis to "draw" lines which shouldnotdisplay very fast, so the phosphoric layer on the screen has no time to load up.Carsten

author: calli
author_rank: Regular Contributor
timestamp: December 16, 2017, 12:02:39 pm
content: Part 2 in printed!Some teasers:https://www.heise.de/make/artikel/Retro-Spiele-auf-dem-Oszilloskop-3908332.htmlCarsten
Artificial Neural Networks, to the point - Page 1
Forum section: electronics / projects

author: ai_maker
author_rank: Newbie
timestamp: May 17, 2015, 07:19:52 am
content: My impression is that Neural Networks have always been the preferred AI tool for EE. Here is my explanation of what they are and what they can do:http://ai-maker.com/artificial-neural-networks-to-the-point/Feedback is very welcome!!

author: SL4P
author_rank: Super Contributor
timestamp: May 17, 2015, 02:57:52 pm
content: I've always been challenged by the term 'Artificial' Intelligence - as it infers a programmed, or guided 'thought process' emulating intelligence to achieve desired outcomes, rather than a free-thinking algorithm to move forward spontaneously within 'experience'.However, on further thought - in theabsenceof Asimov's laws... programmed intelligence may be the safer path - as long as government and business has nothing to do with it!I've been informally studying these interests for a few years under the term 'synthetic' intelligence (SI), which is thus far following a truly organic-like process of acquisition, comprehension, assimilation and reconciliation of sensor primitives within a growing and evolving experience 'tree'. It's pretty interesting if I say so myself!

author: Marco
author_rank: Super Contributor
timestamp: May 17, 2015, 05:49:09 pm
content: Quote from: ai_maker10 out of 10 people use a spiking one :p (Well they have one any way.)It's always interesting to see how far people can push perceptrons, but I'm pretty sure they are pushing diminishing returns.

author: rickey1990
author_rank: Regular Contributor
timestamp: May 19, 2015, 09:08:01 pm
content: I Build basic component based neural nets, Has no memory capacity but its adaptive, Meaning i could build a 4 legged robot with legs made of rubber and it would teach itself to walk, They can also follow/be scared of light,noise,heat,magnetic fields, obstacle detection, reverse, crab walk, speak to each other. Very old stuff but still find it spooky after turning one on, Not sure if url find it interesting but here is my sitehttp://beambuilder.blogspot.co.uk/
AS3933 transmission data - Page 1
Forum section: electronics / projects

author: dani68k
author_rank: Newbie
timestamp: January 16, 2019, 11:47:20 am
content: Hello everyone!I would like to know if there is someone working with AS3933 chip, 3D Low frequency Wake-up Receiver, to discuss about some issues I’m getting with data trasmission.I contacted with AMS support and they gave me no support, directly. I got so astonished about their response.I appreciate if someone knows any contact in AMS for contact and supporting.Any suggestion/comments will appreciate.Thank you!BR,daniel
AS5600L analog output problems - Page 1
Forum section: electronics / projects

author: FrankT
author_rank: Regular Contributor
timestamp: January 07, 2019, 10:10:20 pm
content: I'm playing with AS5600L position sensor breakout board, AS5600L-WL_EK_AB, the one with the WL-CSP footprint.I've connected it up to the AMS tools - USB I&P Box. It shows the device working - the I2C interface shows the registers and current position.If I set it to PWM mode, my scope shows the PWM signal on the OUT pin changing as I change the magnet angle.But, if I set it to analog mode (VDD), I only get the full voltage on the OUT pin. I expected the voltage to be between 0 and VDD depending on the magnet angle. I've tried pull up and pull down resistors, without any luck.Has anyone used these? Is my understanding of the analog output incorrect? I contacted AMS technical support but they just redirected me to local distributors (mouser, digikey, etc)

author: wraper
author_rank: Unknown
timestamp: January 07, 2019, 10:14:40 pm
content: I do not see any analog mode in the datasheet to begin with.

author: FrankT
author_rank: Regular Contributor
timestamp: January 07, 2019, 10:19:23 pm
content: Doh!I was looking at the AS5600 datasheetLooks like PWM mode it is, although it means I have to program it before I can use it.Thanks for the help.
Ascii/hex serial port terminal software - Page 1
Forum section: electronics / projects

author: electroguy
author_rank: Regular Contributor
timestamp: March 01, 2012, 05:30:53 am
content: Hi,about 5 to 8 years ago i used some terminal software for interfacing to a serial port and microcontroller.It was very similar to hyperterminal, putty, teraterm, realterm etc...however, this software also displayed hex in blue mixed in with ascii for bytes that were not printable (ie, outside the normal 0-9,a-z range.To cut a long story short, i can't remember the name of it, and need it back. Has anyone used it? know what it is called? i need to dl it asap!Just so you know what i am talking about, it would display ascii and hex similar to this:\01\02\03\04This is an ascii string with 4 hex bytes at the start and end of it\01\02\03\04etc........any ideas? or anyone know of software that can do something similar?

author: Unknown
author_rank: Unknown
timestamp: March 01, 2012, 05:35:42 am
content: Quote from: electroguy on March 01, 2012, 05:30:53 amThe best serial comms test emulation and diagnostic tool bar none.http://www.docklight.de/

author: TerminalJack505
author_rank: Super Contributor
timestamp: March 01, 2012, 06:10:19 am
content: You might browse through this thread and see if any the names mentioned ring a bell:https://www.eevblog.com/forum/beginners/hyperterminal-like-program/

author: enz
author_rank: Regular Contributor
timestamp: March 01, 2012, 07:35:44 am
content: I think you are looking for something like this:http://www.der-hammer.info/terminal/bilder/term_065win_large.pngThe program is called HTerm and can be downloaded here:http://www.der-hammer.info/terminal/The website is in german but the program is completely in english.I use this program a lot and can highly recommend it.Regards, MartinQuote from: electroguy on March 01, 2012, 05:30:53 am

author: electroguy
author_rank: Regular Contributor
timestamp: March 01, 2012, 09:07:31 am
content: thanks for the quick replies. The one i have used is not listed, but hterm and docklight seem pretty good.

author: electroguy
author_rank: Regular Contributor
timestamp: March 01, 2012, 10:47:41 pm
content: haven't found it yet, but hterm is looking pretty good so far.
ASK Demodulator - Page 1
Forum section: electronics / projects

author: shaikss
author_rank: Newbie
timestamp: June 26, 2013, 04:18:30 pm
content: Hi,I am designing an ASK demodulator for RFID Tags. I have attached the circuit diagram. This is the ckt from IEEE paper.If you look at the ckt, the first stage is the inverter kind of thing. I didn't get why second NMOS is used for Stage I. Similarly, the second stage is also inverter with two NMOS. Again, the question is why second NMOS. But when I checked the output of that stage, it is acting like a latch. The last stage is buffer.I generated ASK modulated signal and fed as input to the demodulator. I expected that whenever modulated signal is present, demod output is '1' and when no signal is present, it is '0'. To my great surprise, it is always '1'. I tried to give the input by delaying it. So, for the very first time, because of the delay, I could see a logic '0`' at the output. After the delay, there is signal and so the output is logic '1'. Afterwards, though there is no signal, I don't see logic 0 at the output. Its always high. I assumed that the second NMOS at second stage is acting like a latch. Please let me know how can I redesign it? Or Is my understanding wrong? I have attached the simulated results.
Ask help for design case for piezo sound component - Page 1
Forum section: electronics / projects

author: Sookye
author_rank: Newbie
timestamp: July 31, 2014, 01:20:20 pm
content: Hello,I would like to ask some help to design case for piezo buzzer likethis.The case will be made from ABS with milling, but i dont know how start the design. The case outer sizes are 44x21x10mm and the thickness is lower than 2mm, i think it will be the key for design.The reason why i want to use this type of piezo thing, because of the piezos with own plastic case are too high.Thanks for the helping.
Ask the recommendation for the Remote tools? - Page 1
Forum section: electronics / projects

author: Peter9090
author_rank: Contributor
timestamp: February 03, 2020, 04:57:37 am
content: Hi you guys,Could you please share me some great teleworking software that you are using?

author: aix
author_rank: Regular Contributor
timestamp: February 03, 2020, 08:07:58 am
content: What do you mean by "teleworking software", i.e. which aspect of working remotely? (And what type of work?)

author: Peter9090
author_rank: Contributor
timestamp: February 04, 2020, 05:50:13 am
content: Oh, sorry for the incomplete information. I am using the desktop in the office and with Linux system, but sometimes like during the weekend or at the late night, I need to debug my project. In facr, I can use ssh, but I am still looking for a better remote tool. Do you have any great remote tool to suggest?