hybridfree/eevblog-posts huggingface dataset:
Intronix LogicPort questions... - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: October 30, 2013, 11:54:03 pm
content: Hi Everyone,I'm thinking about ordering one of these, but have a few questions.#1 - Is the case easily opened? Some plastic cases are ultrasonically sealed which I can't stand, but are there screws on the bottom so you can open it? I noticed a picture of the pcb showed a header where you could get the trigger output feature that they charge extra to install and while it isn't a huge feature I want to necessarily pay for, I'd like to know I could use a trigger output if I had to in a situation.#2 - Are the wires on the probe simply color coded with a color ending, or do they actually have a printed label on them identifying which wire is which as well?#3 - Is there any place that sells these at a discount? They have not been receptive to me asking for one that is for sure.Thanks,Alan

author: codeboy2k
author_rank: Super Contributor
timestamp: October 31, 2013, 09:16:52 am
content: I have one. The software is rock solid, and the triggering is quite extensive. The 2k memory depth is quite small, especially for slow moving signals, you have to finess the trigger to get it to capture just right. That's the most annoying thing about it, actually. There is compression and it does help a little. Other people on the forums have said how they like to just use a logic analyzer with a large memory depth and just let it capture everything then scroll through it. With the LogicPort you don't have that luxury and really must spend more time to think through your trigger setup.The case opens easily with 5 screws. Not a problem. The 5th screw hole has a drop of Loctite, as a sort of warranty seal I guess. Inside, the design is simple, but good, and there is only minimal input protection on the probe leads, but they are 40VDC tolerant and I've never blown it up.The probes are color coded wires black to violet for D0-D8, and grouped into 4 groups with color coded plugs, WHITE, BLUE, YELLOW, GREEN, for each of the 4 data groups. GROUND is the grey wire with black plugs. The GND on the probes is also USB GND and Chassis GND, so there is no isolation if you need that. There is no labeling on the probe ends, there is only colors. But the software is also color coded to match, so it's never been a problem. Plus I know the resistor table by memory, and this only helps reinforce that memoryThe plugs are .025" square post compatible, and they plug into mini-grabbers or headers/test points on your board. The standard set of grabbers is all black, no color coded grabbers.I don't know of any discount sales.
Inverted polarity issue! - Page 1
Forum section: electronics / projects

author: bfi1714
author_rank: Newbie
timestamp: March 11, 2014, 10:52:24 am
content: Hi!My work's colleague just asked me if I could check for him his two radios that he has on his boat. The radios are a common AM/FM radio and a UFH radio. Times ago, he plugged the battery power cables inverted (he uses a car battery model) and after this event everything stopped working properly. As a form to help him I went to his boat with my electrical clamp meter and check the resistance of the speaker but everything as alright. So I've started to wonder if the problem couldn't be on the radios. We took them from the boat and I just opened the case of the UFH radio, even knowing that I couldn't to much with only a clamp meter. So, as I person that don't have much experience and tools, I'd like to hear from you what could be the most probable problems. I know that it may be easier and chip to tell him to buy new radios, which his is willing to but even though I'm curious to hear from a professional what happens in such scenario as a form to refresh my mind from my old school on electronics.Thanks and feel free to ask me morebfi

author: Rerouter
author_rank: Super Contributor
timestamp: March 11, 2014, 11:20:33 am
content: inside you may be lucky and find a fuse and a half melted diode, its not too uncommon to have some kind of negative polarity clamp on marine and automotive radios, or in the better made cheaper units they sometimes neck down a trace to deliberately blow out, (act as a fuse)if there is no sign of any protection, and no clear sign of damage, 9 times out of 10 its gone for good(only today i had to deal with auto electricians that where asked to convert an old car to negative chassis, which consisted of them flipping the 2 battery wires and blowing chunks out of the vintage and very painful to restore instrument cluster)

author: ttp
author_rank: Regular Contributor
timestamp: March 11, 2014, 11:25:08 am
content: If you can find them, check the fuses.

author: Psi
author_rank: Super Contributor
timestamp: March 11, 2014, 12:56:51 pm
content: The fuse/crowbar/polaritydiode is usually located within a few cm of the DC input jack. So that's where i'd start looking.

author: bfi1714
author_rank: Newbie
timestamp: March 12, 2014, 09:27:41 am
content: Thank you all for the answers. I'll follow your tips and then I tell you what's going on!Thanks

author: Yago
author_rank: Frequent Contributor
timestamp: March 12, 2014, 12:52:53 pm
content: On the old stuff I repaired the audio amp chip sometimes went when rev volted too.

author: SeanB
author_rank: Super Contributor
timestamp: March 12, 2014, 06:40:07 pm
content: Almost always with this type, but they generally are cheap ones.

author: G7PSK
author_rank: Super Contributor
timestamp: March 12, 2014, 06:44:47 pm
content: I had a problem with an inverter that was wrongly connected the 40 amp fuse was blown by the crowbar diode but the mosfets still blew as well.

author: SeanB
author_rank: Super Contributor
timestamp: March 12, 2014, 07:17:23 pm
content: Power semiconductors blow faster than any fuse.
Inverter arc welder as power supply - Page 1
Forum section: electronics / projects

author: Circlotron
author_rank: Super Contributor
timestamp: October 02, 2017, 01:38:57 am
content: Just looked at the junk mail in the letter box and I see Aldi is selling a 140 amp 15% duty cycle inverter arc welder for AUD$149. Seems the world is awash with these things nowadays. Has anyone here looked into using something like this as a basis for a power supply or maybe a battery charger? I *think* they are DC output; not sure.

author: IconicPCB
author_rank: Super Contributor
timestamp: October 02, 2017, 05:36:57 am
content: Just working on a plasma cutter.A fellow bought it second hand on ebay.Seller claims unit functioning.Byer does not ryit immediately...time goes by .., unit fails on firt attempt to use it.Failure to protective earth.Notionally unit is wired for 220V ( presumably for overseas american market.I check out the powersupply... a track from rectifier filter negative side is connected to protective earth and it is vaporised.Naturally current limiters are blown up.On the supply side Active and neutral connected through a bridge rectifier to filter caps.Mains connection via a double pole power switch.How does anybody expect to have the powersupply operating like that in the MEN system we use in Australia.Have disconnected protective earth from negative of input rectifier unit comes alive.The DC is then inverted ( through a bridge inverter ) and supplied through a toroidal high frequency transformer to secondary rectifier assembly wihc then drive the cutting nozzle.There is also a high frequency high voltge oscilator used to start the arc.A very american design quite unsuitable for australian conditions since american 220V is a bi phase system as opposed to australian 240V single phase system.
Inverter Fail-Over relay circuit - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: April 24, 2019, 03:50:27 pm
content: This is a AC transfer relay circuit that transfers from 120V MAINS to battery backed 120V inverter when the MAINS fail.Do you think it will be safe and reliable?Please delete

author: Zero999
author_rank: Super Contributor
timestamp: April 25, 2019, 03:04:50 pm
content: No. You need a fullwave rectifier and a smoothing capacitor, to stop the relay from turning on and off at 60Hz or trying to.I Googled the EE2-24NU.https://www.mouser.co.uk/datasheet/2/212/KEM_R7002_EC2_EE2-1104574.pdfAssuming I've got the correct data sheet, the coil resistance is 2k88, so you need a 12k 1W resistor.I think this is a penny wise, pound poor solution and it would be better to use a 120VAC relay, even if it's more expensive and through hole.

author: tecman
author_rank: Frequent Contributor
timestamp: April 25, 2019, 03:26:27 pm
content: Another issue is the 00 uf capacitor on the relay coil. This will delay the relay drop-out time resulting is a delay before the inverter power is applied. Also the capacitor will cause a slow release which could cause some additional arcing as the contacts switch. Minimize the capacitor sizing by using a full wave rectifier and only enough C to eliminate buzzing.paul
inverter Mascot, Victron, .. ? - Page 1
Forum section: electronics / projects

author: yt1
author_rank: Newbie
timestamp: July 08, 2015, 11:39:50 pm
content: I'm trying to purchase a pure sine inverter, ~ 500W,maybe Mascot 2286 600Whttp://www.mascot.no/?CatID=1191or Victron Energy Phoenix 800Whttp://www.victronenergy.com/inverters/Phoenix-inverter-180VA-1200VAany opinions about these two brands, any major differences in quality ?Thank you

author: Lightages
author_rank: Unknown
timestamp: July 08, 2015, 11:44:25 pm
content: Why, WHY, does every new person in the forums assume that everyone is psychic and can guess where you live?Oh yes, welcome o the forumsPlease give us more information.
Inverter Oscillator Ground Return - Page 1
Forum section: electronics / projects

author: longlivetheDee
author_rank: Newbie
timestamp: February 14, 2024, 06:34:02 am
content: Hello technical folks! I have a PCB design for a guitar pedal with a DSP chip processing some audio signals that would normally run off a 32768 Hz crystal, but part of the effect allows the user to change the clock speed using a slide potentiometer. To do so, I am using the Schmitt trigger oscillator circuit shown in the Falstad schematic. My question is regarding ground return paths and shielding of the audio trace from the oscillator.As shown in the PCB layout image, the oscillator circuit is entirely contained within a ground pour on the top layer. There is a solid ground pour on the bottom layer below the oscillator. There is an audio trace to the left and top (highlighted in yellow) and some audio traces off to the right (not shown). Additionally the DC power supply is off-screen to the right (also not shown). Given the design of the oscillator circuit, am I correct in thinking that there should be no high frequency ground return path from the oscillator that induces noise in the audio traces, and only the DC will have a ground return path off to the right? Should I include some via fencing to further shield the audio?

author: jonpaul
author_rank: Super Contributor
timestamp: February 14, 2024, 02:06:33 pm
content: Bonjour, no idea what is "Falsted"At ~ 37kHz the grd pl an layout of little concern.j

author: Zero999
author_rank: Super Contributor
timestamp: February 14, 2024, 07:46:51 pm
content: Falstad is a web based simulator. It's great for demonstrating many electrical principles but is rather limited, compared to a proper SPICE simulator.The circuit attached to the original post doesn't appear to be a Schmitt trigger oscillator.Here's how to make a Schmitt trigger. I would recommend the 74HC14, as the 40106 isn't ideal at 3.3V.A2 can be all the unused sections in parallel, to lower the output impedance.
Inverter project - looking for revision - Page 1
Forum section: electronics / projects

author: TreeOone
author_rank: Newbie
timestamp: March 05, 2019, 09:57:47 am
content: Hello everyone!I've decided to build a 3-phase inverter with input power factor correction circuit (PFC). This small project got a little complicated on the way....My inverter should draw power from local utility grid 1-phase 230Vrms / 50Hz, then rectified it and step it up to approximately 565Vpeak. Finally, use this DC voltage to create 3-phase output 400Vrms / 50Hz.I would like to supply small sized 3-phase motor. The idea is to draw 10Arms maximum from utility grid (with power factor close to 1), which equals 2,3kW, and pass it to my 3-phase motor (which equals 3,3Arms per phase, not including reactive energy, so actual current should be maybe 6Arms, or 8,5 Apeak).Now, since I would like to monitor operation of my inverter, I've decided to measure some values:a) PFC input circuit:a1) grid rectified voltagea2) PFC inductor currenta3) output DC voltageb) 3-phase motor circuitb1) current in all motor phasesI plan to utilize NUCLEO-F767ZI or NUCLEO-H743ZI for control purposes, which will connect to designed PCB via pin header connectors (i.e. MCU will not be part of PCB itself).I've drawn my inverter in KiCad (attached below), and as it turns out, the most complicated thing so far are conversions from analog to digital domain, involving multiple op-amps, opto-couplers and similar exotic beasts. (I am aware that MCU programming is another complicated task, but that one is in virtual domain where errors can be easily fixed.)Since I don't have lots (any) of experience (so far I've managed to persuade Arduino Uno to blink a few LEDs and turn on one stepper motor) I would like to ask the community for some help.Can somebody take a look at my drawing, particularly at those nasty op-amps and opto-couplers, with protection diodes and give his/her opinion on this matter. So far I have invested two months in research, and at this moment everything looks OK, but due to my lack of experience, I would like to hear some unbiased opinions.All comments are welcomed!
inverter specifications?  85901A AC Power Source vs APC  - Page 1
Forum section: electronics / projects

author: CopperCone
author_rank: Super Contributor
timestamp: March 21, 2018, 04:32:54 pm
content: I actually own a 85901A AC Power Source.The specification for the waveform isVoltage135 or 270 peak ± 5% rectangularwaveform with 25% dead zone(115 or 230 Vrms ± 5%)How does it compare to something like a APC backup battery? I'm wondering if there is anything special about this inverter.https://doc.xdevs.com/doc/HP_Agilent_Keysight/HP%2085901A%20Operation%20%26%20Service.pdfPage 81 has a picture of the output waveform and the prior pages have some description on the control circuit.It also claims to comply to a VDE0871 level B EMI standard.How well does this thing compare to computer backup batteries? Like a APC2000https://www.hardwareinsights.com/database-of-ups-output-waveforms/2/I imagine the sine-wave output would be superior.. but I don't know much about this stuff. Any reason why they have such a seemingly crappy output waveform on something meant to plug into sensitive spectrum analyzers?
Inverting boost buck converter - Page 1
Forum section: electronics / projects

author: gmc
author_rank: Regular Contributor
timestamp: June 11, 2024, 02:41:32 pm
content: I've been using a MT3608 chip for a while on some of my projects to generate 12V from a 5V USB supply which has been working great.On a new project I need -12V and 5V so am wondering how I can use the below schematic to do this if at all possible, or do I need a specific boost chip which supports inverting? If so, any recommendations.Looking for -12V @ 250mA

author: youngda9
author_rank: Regular Contributor
timestamp: June 11, 2024, 04:27:59 pm
content: Check out the LT1372, datasheet has a couple of circuit topologies that you might be interested in on sheet 11 of the datasheet. -5V converter, and +/-15V converter that could easily be altered to +/-12V as desired. Something similar could probably be done with the chip that you're using for the flyback applicaiton.

author: gmc
author_rank: Regular Contributor
timestamp: June 11, 2024, 05:42:17 pm
content: Thanks. That looks like it will do just the job.

author: mariush
author_rank: Super Contributor
timestamp: June 11, 2024, 07:35:49 pm
content: Those LT1372 chips are quite expensive... as most LT parts are.There's Rohm BD81870 for example, 2.5$ for one piece, dual output switching regulator, one output is step up, the other is inverting :https://www.digikey.com/en/products/detail/rohm-semiconductor/BD81870EFV-ME2/8028007Datasheet has 3.6v input, 6.2v at 200mA, -6.2v at 200mA example circuit at page 19 :https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/bd81870efv-m-e.pdfWith 5v input, you'd probably get close to +/- 9v at 200-250mA, I'm not sure, go through the datasheet and see what limitations are there.There's also a cheaper BD8316GWL-E2 :https://www.digikey.com/en/products/detail/rohm-semiconductor/BD8316GWL-E2/4625662- datasheet shows example circuit that does 2.5v - 5.5v to +/- 5.6v 200mAA cheap *34063 chip would also do the job of inverting, but no idea if the usb port can supply enough current to have both 12v and -12v at up to 250mA. It won't do 250mA out inverting 5v to -12v, but 150mA would be possible.For -5v, there's charge pump regulators that can invert the usb input, up to around 100mA they're cheap, around 1$ :https://www.digikey.com/short/pdrcr3q3EDIT : There's also much more efficient regulators compared to that MT3608 ... that one's only plus is that it's cheap.For example MP3437 from MPS will get to 95% efficiency (datasheet shows example of 8v out up to more than 2A) :https://www.digikey.com/en/products/detail/monolithic-power-systems-inc/MP3437GJ-Z/18088579MP3435 is even cheaper and example even shows boosting to 12v :https://www.digikey.com/en/products/detail/monolithic-power-systems-inc/MP3435GL-Z/16639901and loads of other chips...
Inverting charge pump efficiency - Page 1
Forum section: electronics / projects

author: gaminn
author_rank: Frequent Contributor
timestamp: November 04, 2019, 03:39:19 pm
content: Hi,I made this inverting charge pump:https://www.allaboutcircuits.com/uploads/articles/DPNVG.jpg. I used BAT65S diode and 2 100nF capacitors. The power supply is 3V3 and I use microcontroller to create PWM (1 kHz, 50 % duty) which drives the circuit.The circuit itself works (there is -3V output). However, the circuit I have has almost 0 % efficiency, it consumes 13 mA when it is operating. There is nothing connected to the output of the circuit.I need something that has quiescent current max 0.1 mA. Is this achievable with this circuit?EDIT: I made some stupid mistake on board, the inverter has perfect efficiency. This topic can be deleted.
inverting converter, EMI concern - Page 1
Forum section: electronics / projects

author: sdouble
author_rank: Frequent Contributor
timestamp: December 16, 2017, 03:11:50 pm
content: Dear All,i'm back to you about some concern about an inverting regulator that i'm designing currently.That pretty much far from my usual business.Basically the idea is to generate a 120 to 200 V (adjustable) negative voltage from a 9 V source. I need to pipe out only 1 to 5 uA.. so basically nothing.I ended up with the following design.I have a major concern about EMI. The circuit should be really quiet.I reduced drastically the current driven by the regulator (about 80mA only) but the voltage tripler leads to a long return path for the current.every comment or advice are very much welcome.J.

author: sdouble
author_rank: Frequent Contributor
timestamp: December 18, 2017, 04:29:51 pm
content: no idea ?

author: dmills
author_rank: Super Contributor
timestamp: December 18, 2017, 05:05:23 pm
content: If you have a 100Meg ohm load, then a few RC filter stages with high value resistors will not drop much voltage, just be careful of microphonics if using MLCCs in the output filter.A couple of poles of the 1M/100nF sort feels appropriate, this kind of thing is commonplace in capacitor microphones.Regards, Dan.

author: sdouble
author_rank: Frequent Contributor
timestamp: December 19, 2017, 05:45:15 am
content: agreed, but my concern was more related to radiated noise.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 19, 2017, 08:10:56 am
content: Radiation depends upon how the device is built; you've shown us nothing to comment on, as far as how much it will radiate.That leaves general advice: build it on ground plane, and place the CW stack, in particular C12 (is that what it is? I can't tell, the labels are such a mess) near U2, R7 and C1.More importantly though, the LTC3863 control loop is not compatible with a capacitive load inverter. Note that, when the transistor turns on, there is a direct, instantaneous path (through diodes and capacitors) to the output, capable of ~unlimited peak current flow.You need very little average power, so it's probably not noticeable anyway (it'll always be in burst mode, except during startup which will be much slower than expected), but it's not good practice. The direct consequence of this is low efficiency.Preferred method is a tapped inductor. Coilcraft for example have coupled inductors in modest ratios, like 1:3 and 1:10, in the LPR and other series.Tim
Inverting DC-DC converter/charge pump (somewhat high voltage) - Page 1
Forum section: electronics / projects

author: forrestc
author_rank: Unknown
timestamp: November 07, 2017, 12:57:06 pm
content: I'm driving myself crazy looking for a part I swear that I had found, and even scratched out a block diagram using it... Now I need it, I can't find the part nor the block diagram.Background: I have several products which have multiple redundant power supplies. I use a shotkky diode from each input to a common positive rail to select between them for my low voltage control (3.3V@500mA). Traditionally, these have all been positive in reference to ground, but I keep getting asked to also support negative rails as a power input. Now I'm doing a board revision I'd like to see about incorporating this.For reference, these input voltages can be either polarity in reference to circuit (and earth) ground, and range from 10V to 60V away from ground. So +-10-60V. Today I require at least one of the supplies to be positive - this requriement is what I'm trying to eliminate. I've looked at various options, but it seems like the simplest is to add a negative rail and then add an inexpensive charge pump and/or DC DC converter to flip the polarity and then feed it into the buck regulator which is already on the board.The part I'm going crazy trying to find is the converter I had found which was perfect. Negative input up to at least -70V (for some headroom), inverting, positive output high enough to feed into the 10-60Vin buck converter already on board. And inexpensive. I think it was a switched capacitor inductorless product, but I haven't found any which fit the bill (in particular, high negative voltage), even though I'm almost 100% that I had found one previously. I'm also almost 100% certain this wasn't an isolated product, since isolated usally = expensive transformer.Does anyone know of a part like I am describing?
Inverting Output DC-DC Regulator Options - Page 1
Forum section: electronics / projects

author: pacmann
author_rank: Contributor
timestamp: August 08, 2022, 11:52:11 am
content: I want to find a inverting output dc-dc regulator that I can get assembled from JLCPCB with output of -18v, 150 mA max in my circuit. My input is 5v.NCP3063 is supposed to be newer version of MC33063 but is not stocked. Is there a regulator better or more efficient than MC33063 for this circuit?Thx!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 08, 2022, 12:23:31 pm
content: Use a Cuk converter, any boost/flyback regulator will do. Only some support negated inputs so you'll need to add an inverting op-amp to get the correct feedback polarity.CS5171 family comes to mind.Tim

author: pacmann
author_rank: Contributor
timestamp: August 10, 2022, 08:48:13 am
content: Thanks. What determines the max output current for the CS5171? Its has a 1.5 A switch but their example circuit only shows 75 mA output current.

author: mariush
author_rank: Super Contributor
timestamp: August 10, 2022, 09:24:45 am
content: They have MC34063ADR2G available nearly 50k+ parts :https://jlcpcb.com/partdetail/Onsemi-MC34063ADR2G/C32078if it does 150mA or not... not sure. There's online calculators or formulas in datasheet you can use.*33063 is also available but you'll have to be careful here... unless I'm confusing it with some other code, I think some 33063 chips don't support inverting, only buck/boost.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 10, 2022, 02:50:46 pm
content: Quote from: pacmann on August 10, 2022, 08:48:13 amThat's a charge pump circuit, not a switched inductor circuit. Possibly that's as much current as can be sunk through the output capacitor (follow the diodes).Cuk uses two inductors, preferably coupled, and has dynamics same as any boost/flyback.Tim

author: Faringdon
author_rank: Super Contributor
timestamp: August 10, 2022, 07:03:31 pm
content: Here is a cuk with neg output in LTspice the free sim...
inverting output, or changing logic for battery application - Page 1
Forum section: electronics / projects

author: Moriambar
author_rank: Unknown
timestamp: October 15, 2018, 06:37:32 am
content: Hello. I'm sorry for the obscure title.Basically I have an RTCC and an LTC2956 which can cause an interrupt in an attiny micro. It's important that they share the pin on the micro. Also: the circuit is battery powered, so I'm concerned about battery lifeI thought, originally to use an LTC2956-1 (which has an active HIGH, that gets used elsewhere in the circuit) and OR its output with the one coming from the RTC (a PCA2129). Unfortunately I now see that the PCA has an active low, which makes me panic (I am now stuck with that component). And so I don't know which alternative is best for battery life. These are the alternatives that came to my mind, can you help me out choose or think of another one, please? Here they are:Using a not gate attached to the RTC outputUsing an ltc2956-2 which has an active low. Then I have to NOT its output all the time though in the branch that uses itSame as the first but using a couple of mosfetsI hope this made sense!Thanks
Inverting Switch Mode supply. - Page 1
Forum section: electronics / projects

author: kvresto
author_rank: Regular Contributor
timestamp: December 09, 2015, 01:02:02 pm
content: Hi Everyone.I need a negative power supply to run of a battery from 9V to 15V, to give me an output voltage of about -18V, so obviously this will be an inverting buck/boost topology. I believe most buck regulators can be used in an inverting buck/boost topology?, or is there more to it than that. I'm looking at TI's TPS5402 3.5V to 28V Input, 1.7A Output, Non-Synchronous Step-Down Regulator with Integrated MOSFET as a possible candidate.Has anyone had some experience in this area and can shed some info on what can and can't be used for this application (an inverting buck/boost topology).I'm rolling my own boards so anything with a power pad/thermal pad is just a pain to use, so I have always kept away from them.Thankskvresto

author: ajb
author_rank: Super Contributor
timestamp: December 09, 2015, 04:43:18 pm
content: You can certainly do it, just be aware that in operation the converter sees the difference between Vin and Vout as its supply voltage, so make sure that your converter can tolerate that voltage. So for example if you're generating a -5V rail from a 24V input, as far as the converter is concerned it's running from a 29V supply and bucking it down to 5V. Obviously any control or status pins will also be referenced to the negative rail, so they'll require special handling to be able to interact with them from Gnd-referenced circuitry.

author: bktemp
author_rank: Super Contributor
timestamp: December 09, 2015, 05:34:22 pm
content: The inverting buck configuration draws a high current on start up: The power supply must be able to supply enough current or the converter will not start up correctly or even short the power supply.One workaround is a soft start or a a delayed start to allow the input capacitors to charge up and supply enough current.

author: kvresto
author_rank: Regular Contributor
timestamp: December 09, 2015, 11:58:41 pm
content: ok, thanks to all, and AcHmed99 those app notes were great.The TPS5402 is a current mode device, and some of TI's/NS Simple Switchers are voltage mode devices, now is it true to say that early designs were voltage mode, and all latter design are current mode?SIGSEGV is inevitable if you try to talk more than you know....................... Yep!
Inverting version of an IR2110?? - Page 1
Forum section: electronics / projects

author: Chris Wilson
author_rank: Super Contributor
timestamp: January 17, 2017, 06:24:43 pm
content: Would anyone happen to know if an inverting version of the IR2110 MOSFET driver IC is available please?http://www.infineon.com/dgdl/ir2110.pdf?fileId=5546d462533600a4015355c80333167eThanks.

author: bktemp
author_rank: Super Contributor
timestamp: January 17, 2017, 06:42:53 pm
content: The only IR21xx with active low inputs I know is IR2102, but it has a 8 pin package and can output less current than 2110.If you need it to solve your deadtime problem, you could try IR2184(4). It has only a single input + shutdown and an adjustable, build in deadtime.

author: Chris Wilson
author_rank: Super Contributor
timestamp: January 18, 2017, 11:52:32 am
content: Thanks for that, I am trying an alternative schematic for driving the FET's but it doesn't use an inverting driver, so I would have to change the flip flop, too. Your suggestion looks very interesting and i am pondering where to go at the moment!
inviot.com/u1 project - Page 1
Forum section: electronics / projects

author: francastro
author_rank: Newbie
timestamp: July 14, 2021, 03:54:30 pm
content: HiDoes anyone out there remember the project InvIot.com - inviot.com/u1 arduino compatible board shield?Does anyone want to share this schematic?Thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: July 14, 2021, 04:25:25 pm
content: Well it seems the schematic was never released after the kickstarter campain ?? or it failed ?? send them an email ?Seems a mashup of different interfaces in one pcb project

author: francastro
author_rank: Newbie
timestamp: July 14, 2021, 05:25:17 pm
content: I tried email weeks ago but nothing until now. I've never heard nothing about kickstarter campaign. I just can't figure out what is in that design.
I/O-Link Device Stack Examples? - Page 1
Forum section: electronics / projects

author: Sudo_apt-get_install_yum
author_rank: Regular Contributor
timestamp: March 20, 2020, 10:05:09 am
content: Hello everyone!Im just starting out with the implementation so forgive me for asking dumb questions!I have previously written a device stack for HART 5 and made ModBus RTU implementations for previous projects, the information regarding these communication methods are widely available (less with HART).Im having a somewhat hard time finding any code examples. Im currently reading through the official I/O-Link system specification and will use this to create a device stack if i cant find any quicker way of doing so.https://io-link.com/share/Downloads/Spec-Interface/IOL-Interface-Spec_10002_V112_Jul13.pdfI am aware that i can purchase a device stack from tons of different companies, though it is a backup plan. It would be great if anybody can recommend a company that sells a generic C/C++ I/O-Link device stack.Hardware:TIOL111 or MAX2251XThese seem to be the go-to transceiver IC's that are used for I/O-Link.I would prefer to use the TIOL111 from Texas Instruments but might have to use the MAX2251X from Maxim depending on the stack.This was an unexpected last minute request witch is why im here asking for a "quick and dirty solution"...I woudl greatly appreciate if anybody knows of any code examples for I/O-Link, has any better recommendations of IC's or knows of a cheap or good stack supplier.

author: robint91
author_rank: Contributor
timestamp: April 14, 2020, 04:33:50 pm
content: Did you find any stack vendors?I found one but that was 17k€ for the device stack. Which is too much for our application.Btw do you know how much the membership fee costs? I don't find that anywhere.
IODELAY - Page 1
Forum section: electronics / projects

author: cksa
author_rank: Regular Contributor
timestamp: June 11, 2012, 11:53:54 am
content: Does the availability of IODELAY blocks in xilinx fpga's mean that I do not have length match my signals in a parallel bus?

author: nctnico
author_rank: Super Contributor
timestamp: June 11, 2012, 03:46:23 pm
content: You have to be a lot more specific to get a precise answer. The fixed value IODELAY blocks are used to make it easier to meet setup & hold timing. Whether or not you need to match trace lengths depends on the speeds you try to achieve.

author: krenzo
author_rank: Regular Contributor
timestamp: June 11, 2012, 05:42:10 pm
content: Yes, you can use IODELAYs to offset signal timing if your signals arrive at different times. I think it's easier to match trace lengths if you have the space on your PCB. However, I have used IODELAYs in the Spartan 6 to offset signals that weren't lined up with their clocks. They are a bit difficult to setup though, and they drift with temperature and voltage (if you're not using a Virtex) which requires you to recalibrate them over time.
IoT app store concept - Page 1
Forum section: electronics / projects

author: skandragon
author_rank: Newbie
timestamp: September 08, 2017, 02:24:14 am
content: While I know this is mostly a hardware related site, many of us may be building various types of IoT projects. By and large, these are insecure I suspect mostly because security is Hard.I'd like to design and build an open source project intended to make security easier for IoT devices to update firmware and other data. I have various concepts I'm considering, but ideally I'd like to work with a UE / UI coder who knows some modern frameworks, and ideally a second backend developer (I'm the first).If you are interested, let me know. I don't intend this project to be an income source, but that's always an option, most likely as a support or additional feature role. The base system, including the security model IoT so badly needs, will remain open source and free to use.Any takers?

author: ataradov
author_rank: Super Contributor
timestamp: September 08, 2017, 03:25:22 am
content: How is the store going to make things more secure? If anything, it is going to be a single attack point.And also, the idea of centralized source/store for firmware updates will not work for most IoT vendors. The goal for them is to isolate themselves from everything as much as possible, since that makes money. Having centralized servers they don't control goes against that goal.You may get takers from some open projects, but I really doubt it.

author: bitseeker
author_rank: Super Contributor
timestamp: September 08, 2017, 07:36:01 am
content: Welcome to the forum. There's software stuff going on around here, too.Is that you, Andreas? What you describe sounds like the IoTAppStore with its OTA firmware updating.
IoT ArduPiSHIELD for Raspberry Pi and Arduino - Page 1
Forum section: electronics / projects

author: AwesomePCB
author_rank: Contributor
timestamp: November 12, 2016, 08:24:22 pm
content: Hello Everybody,This is continuation of my previous post about ArduSHIELDhttps://www.eevblog.com/forum/projects/ardushield-most-versatile-shield-for-arduino/msg1019417/#msg1019417One of the supporter of Indiegogo campaignhttps://igg.me/at/ArduSHIELDfor ArduSHIELD gave a hint to make a similar shield for Raspberry Pi platform.Base on this I was start digging little more this subject and I thought why not to combine two platforms, and give all support from Arduino platform (hundreds of shields out there) to Raspberry and vice versa.At this moment project is in the concept phase, ArduSHIELD were connected with Raspberry Pi by universal PCB (2.54mm) and connector.Next idea would be to have support on ArduPiSHIELD for realy popular IoT Wi-Fi module ESP8266.Please let me know what do you think about this idea, and let me know what can be done better.Thank you Simon.
IOT based Smart Irrigation project - Page 1
Forum section: electronics / projects

author: mrnams
author_rank: Newbie
timestamp: September 05, 2023, 07:08:32 pm
content: Hello All,I am working on IOT based Smart Irrigation project.In first phase I shall work on controlling water pump, right now my 7.5hp motor is controlled by "3 phase star delta starter".Could you please provide/point to web source for following queries?1) Three phase motor don't have neutral, So how I get 5v dc to operate Arduino/ESP32 using 3phase 440volt?2) How to measure voltage in each phase to protect motor from phase failure?3) How to measure current very accurate to protect motor from dry run? which CT is best?4) How to get status of motor whether its on or off?
IoT Desk Lamp - using an Arduino Nano 33 IoT and Digital Loggers IoT Relay - Page 1
Forum section: electronics / projects

author: mindcrime
author_rank: Unknown
timestamp: April 24, 2021, 04:33:19 am
content: I've recently been playing with using the combination of anArduino Nano 33 IoT boardand anIoT Relayto let me control mains powered devices over Wifi and/or Bluetooth. Here's a little video demo / walkthrough I put together, more for my less technical friends, but you all might find it interesting. To my mind, this is basically the "hello world" or "make an LED blink" of IoT projects, but it's a starting point. I think this combination has a lot of potential. I especially like that that Nano board is as small as it is and still manages to have Wifi and Bluetooth built in.Also, the "IoT Relay" is a nice bit of kit from what I've seen so far. It has 1 "always on" plug, 1 "normally on" plug, and 2 "normally off" plugs, and includes surge protection like a normal power strip. But the digital control works down to 3.3VDC and is current limited, making it (if you believe the hype) safe to drive it directly off of the digital output of an Arduino. I've been doing just that with no apparent stress to my Arduino, so it's looking good so far.
IoT Development board - DPT-Board - Page 1
Forum section: electronics / projects

author: dpape
author_rank: Contributor
timestamp: April 13, 2015, 06:44:21 pm
content: Hello,Last summer we from DPTechnics did a crowdfunding campaign and succeeded. We had a topic here on the EEVBlog forum also. As a surprise for our backers we included a voucher code for the BlueCherry platform.Yesterday the BlueCherry platform has opened. It is an IoT-platform without vendor lock-in and complete freedom. It let's you connect your DPT-Board or other linux development board to the internet without the need for port-forwarding/firewall settings, security issues and dynamic DNS settings. It even works if you are behind an ISP level NAT.You can read more about the platform onhttps://bluecherry.ioand more about the hardware onhttps://dptechnics.com. We are also giving away 50 free vouchers for the first 50 buyers of a DPT-Board. You can find them in our shop:https://dptechnics.com/shop/index.php?route=product/category&path=59Kind regards,The DPTechnics Team

author: JacobIsHere
author_rank: Contributor
timestamp: April 14, 2015, 07:16:05 am
content: verry nice!
IOT development board - Page 1
Forum section: electronics / projects

author: me.rishabh12
author_rank: Contributor
timestamp: January 21, 2018, 05:55:58 am
content: we designed a development board for learning iot and embedded systemi m very new in electronics design and thannkks to dave jones i learned a lot from himim sharing the YouTube video pls give ur worthy feedback to improve my producthttps://youtu.be/FOjWIAKhHXU<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/FOjWIAKhHXU?rel=0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

author: cstratton
author_rank: Regular Contributor
timestamp: January 21, 2018, 07:27:36 am
content: Quote from: blueskull on January 21, 2018, 06:01:39 amFalse criticism. It has Ethernet, Bluetooth and an ADC visible, and apparently also LoRa. It has relays.Unless there are *severe* software limitations that should make a fair number of IoT projects possible.

author: me.rishabh12
author_rank: Contributor
timestamp: January 21, 2018, 02:03:02 pm
content: it is designed for colleges and students to explore in field of Embedded System & IOT,i admit it doesn't have on chip support for peripherals like RF Ethernet,wifi,but our main aim to give student knowledge that how thing work"external ADC is for the mcu like 8051 which doesn't have internal ADC""external Ethernet and Bluetooth so we can use mcu of our choice to design the products"we have ESP8266 board support with pin headers and a 5v Bidirectional logic converter which can be also integrated with out Ethernet chipAnyway thank for ur precious comments

author: me.rishabh12
author_rank: Contributor
timestamp: January 22, 2018, 07:45:20 am
content: Quote from: blueskull on January 21, 2018, 07:39:53 amits mainly designed for students and hobbyist for learning microcontrollers and IoT
IoT Device Design Direction - Page 1
Forum section: electronics / projects

author: RABeng224
author_rank: Contributor
timestamp: January 27, 2014, 09:13:22 pm
content: Hello Guys,Looking for some input on a new product design. I am designing a product that will be connected to the internet via Ethernet. The board will also have 802.15.4 capability. This product will connect to our existing products, already in the field, that have 802.15.4 capability. This new product will be a gateway between the end products and the internet. This new gateway product will need to support TLS (SSL) encryption, minimal HTTP server, polling many 802.15.4 (this protocol is off-chip on a module) connected devices, HTTPS client, etc...I am interested in getting peoples options on architecture. With the dropping costs of 32 bit ARMs and the like, is it time to switch to an RTOS for this type of product? I have designed and deployed a few products based on Microchip hardware (8 and 32 bit) and their TCP/IP stack (co-op multitasking) and have had no "big" problems. I have looked into Renesas RX line with the Micrium RTOS and TCP/IP libraries and this seems to be a nice solution. It is even nicer because Renesas is "giving away" a free IAR C compiler and production seat of Micrium, if you are building a commercial product. I don't have any real experience with embedded Linux so I would like to stay away from that route if possible, but I am open to suggestions.Thanks,RB
IoT device: self configuring Wifi? - Page 1
Forum section: electronics / projects

author: nctnico
author_rank: Super Contributor
timestamp: November 19, 2016, 07:16:19 pm
content: I'm working on a project which could be classified as an IoT device. The first version will have wired ethernet interface but it is hard to ignore the benefits of Wifi. The only problem is that to get Wifi working you'd need to input settings and a key. However the device I'm designing doesn't have any means for input and I'd rather not have the users connect it to a PC first. I'm wondering if there is some kind of (emerging) standard for setting up devices over Wifi which could overcome this chicken and egg problem.

author: djacobow
author_rank: Super Contributor
timestamp: November 19, 2016, 07:38:52 pm
content: Everyone seems to do it differently. I've easy way is for an unconfigured device to come up as a WiFi AP, hosting a little web server that can let the user set credentials. After a reboot, the device comes up normally, with the AP disabled.Others have used light pulses from a phone app going to a phototransistor of the device. Some have done the same with sound.

author: kripton2035
author_rank: Super Contributor
timestamp: November 19, 2016, 07:43:33 pm
content: WPS ?https://en.wikipedia.org/wiki/Wi-Fi_Protected_Setup

author: nfmax
author_rank: Super Contributor
timestamp: November 20, 2016, 10:22:08 am
content: Another idea here:http://www.hardill.me.uk/wordpress/2016/09/13/provisioning-wifi-iot-devices/

author: krho
author_rank: Regular Contributor
timestamp: November 20, 2016, 10:31:26 am
content: Quote from: djacobow on November 19, 2016, 07:38:52 pmThis is the way I would do it.

author: nctnico
author_rank: Super Contributor
timestamp: November 20, 2016, 03:27:22 pm
content: I like the article nfmax pointed to. It almost seems that in order to supply the end user with a plug&play system you'll have to supply a pre-configured Wifi access point which connects to a wired ethernet network.

author: rstofer
author_rank: Super Contributor
timestamp: November 20, 2016, 06:16:55 pm
content: Here's some interesting code for the Arduino and the ESP8266 WiFi adapter. It implements WPShttp://bbs.espressif.com/viewtopic.php?t=1096
IoT module 3G/4G/LTE, PTCRB certification - Page 1
Forum section: electronics / projects

author: nuclearcat
author_rank: Unknown
timestamp: February 13, 2021, 05:13:56 am
content: Customer asked to integrate "mobile" connectivity to product. It is relatively simple in EU, but in US, seems not so, even if i add FCC certified module.So, question is: is it mandatory for final product to be PTCRB certified (even if module is "pre-certified")?If true, what happen if someone ignore this question and release product to market, so customers just plug sim card and use it.
Iot Water Monitoring System ESP32 WiFi + Bluetooth Module, Water Flow Sensor - Page 1
Forum section: electronics / projects

author: Mechatrommer
author_rank: Super Contributor
timestamp: January 14, 2021, 12:26:24 pm
content: looks like my nephew got into the line, soon i can have a padawan yay!... i think its his 1st year project.. just sharing in case someone can benefit, and i will be glad if you can put a like (or many likes) for him, further discussion also welcomed. this is i guess a beginner project, but since beginner section is only for asking questions, i put this completed project in tech section. cheers.
IP rated encoder for HMI - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: July 04, 2023, 08:21:47 am
content: We have a potentiometer on our HMI, and the is only one reason why, we could not find an IP rated encoder. But surely this cannot be the case? surely using HMI's in the great outdoors is a thing?

author: ArdWar
author_rank: Frequent Contributor
timestamp: July 04, 2023, 09:05:50 am
content: Huh? Short search on mouser returnssizable selections. What IP rating do you need?For extreme harsh environment I usually go directly to magnetic shaft and hall effect sensor. Custom made but there aren't that many option when you want zero enclosure penetration.