hybridfree/eevblog-posts huggingface dataset:
Knobs for these Potentiameters? - Page 1
Forum section: electronics / projects

author: skyler
author_rank: Regular Contributor
timestamp: September 13, 2015, 03:53:33 pm
content: I just ordered these pots on eBay, but I see no specification on the shaft diameter.http://www.ebay.com/itm/10x10K-ohm-Linear-Taper-Rotary-Potentiometer-Panel-pot-15mm-Shaft-Nuts-Washers/261971084116?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D33203%26meid%3D2599bfe45a574c098876f6be954d4479%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D291010300828I looked on many similar listings but can only find the shaft length is close to 15mm.Is there a standard shaft size from the look of the picture that I can be safe with getting knobs for ?Would these work?http://www.ebay.com/itm/5PCS-Volume-Control-Rotary-Knobs-For-6mm-Dia-Knurled-Shaft-Potentiometer-Durable-/161762238539?hash=item25a9c7e04b

author: SeanB
author_rank: Super Contributor
timestamp: September 13, 2015, 04:08:26 pm
content: Pretty much yes, the shaft is 1/4inch diameter, or 6mm.

author: Jidis
author_rank: Regular Contributor
timestamp: September 13, 2015, 05:54:36 pm
content: Quote from: SeanB on September 13, 2015, 04:08:26 pmBut are those still equivalent for a knurled "press-on" knob? I've had ones where you had to pound them on, bending the shaft's prongs, which I guess was a 6mm trying to go on a quarter inch shaft.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: September 13, 2015, 05:58:27 pm
content: Anything but chicken head knobs!

author: SeanB
author_rank: Super Contributor
timestamp: September 13, 2015, 06:10:11 pm
content: Fluted shaft is typically 6mm, though there are some 5mm and 4mm, but the back is always different to the ones on eBay. Those are always 6mm. old ones from 1960 will be non fluted and 1/4inch, fixed with a set screw or a collet.

author: dom0
author_rank: Super Contributor
timestamp: September 13, 2015, 06:31:46 pm
content: Quote from: SeanB on September 13, 2015, 04:08:26 pmEh, a 6 mm knob won't fit on a 1/4 in (=6.35 mm) axle. Okay, the other way around it does (but it wobbles), and only if it has a fixing screw (not push on or collet).

author: SeanB
author_rank: Super Contributor
timestamp: September 13, 2015, 06:37:46 pm
content: Chinese 1/4 is 6mm, they round diameters down to cut cost.
Know anything about the Mitsubishi OSA serial encoder Protocol?????........ - Page 1
Forum section: electronics / projects

author: Smokey
author_rank: Super Contributor
timestamp: March 29, 2018, 06:31:32 am
content: I inherited a Mitsubishi servo that has an OSA absolute serial encoder. I know it's not a standard quadrature output. I did some searching and didn't come up with much as far as an interface spec. I see that Heidenhain actually makes encoders that output this spec now. One Delta-Tau manual was the only thing I could find about anyone that was able to interface the protocol apart from actual Mitsubishi drives.Anyone have any secret resources they want to share? Just checking before I rip it out and put a standard quad incremental in there.

author: duak
author_rank: Super Contributor
timestamp: March 29, 2018, 04:19:27 pm
content: I've worked on a few CNC machines using Mitsubishi controls that use a serial encoder interface. I might have found something at one time - if I did it was most likely off the 'net using using terms like MEAU or Meldas serial encoder interface or protocol. If I find something more, I'll post it here.Best o' luck,
KNX power line IC search - Page 1
Forum section: electronics / projects

author: Memphis
author_rank: Contributor
timestamp: April 29, 2013, 10:05:09 am
content: Hi all,first of all, for those who dont know nothing about KNX, here are some study sites:KNX.orgKNX specification v3.0Already founded IC drivers for twisted pair solution:NCN5120FZE1066TPUART 2Founded some solution for RF:MSP430 + CC1150But nothing for Power Line communication using KNX specification

author: amyk
author_rank: Super Contributor
timestamp: April 29, 2013, 10:40:17 am
content: ST7538?

author: Memphis
author_rank: Contributor
timestamp: April 29, 2013, 10:49:37 am
content: Quote from: amyk on April 29, 2013, 10:40:17 amIt has a carrier frequency at 110kHz and baudrate 1200bits/s which is must for KNX-PL, but this IC is obsolete and there is no mention about KNX protocol layer which is needed. Yes you can do it by SW stack too, but its better to have it integrated into HW.Already thinking about propertial ST solution they have in they new portfolio.
Kodak Easy Share C743 HACK. - Page 1
Forum section: electronics / projects

author: blackice504
author_rank: Contributor
timestamp: October 24, 2014, 04:12:46 pm
content: Hi everyone,I got a camera off my mum it does not work no surprise as its its a kodak Easy Share C743 for shenzen market lol, anyway i know the LCD works in it and well its not bad, not great ether but i think i could use it as a nice display for something, maybe a death machine power supply or something of that nature...............Anyway i googled the numbers on the front and back and found nothing, but i am sure there must be some way to drive this thing so i can use on my Arduino or maybe a Raspberri Pi ect or even HDMI/DVI ect, i have seen off the shelf display drivers for Nokia phones ect, so i was wondering does anyone know where i could find a driver for this thing, its not a bad screen the photos looked good and i promise i will not use it for a Death Machine or anything of that natureHonestly i have so many uses for a little screen right now i not sure what to pick.Following Uses of Evil..Logitech G15 upgrade........PSU upgrade....Multimeter screen..... mmmm over kill but who cares its for science!!!!!.Death Machine.....4th mini screen on my computer that just displays emails of world domination "wait did i say that out loud?".....

author: Zapro
author_rank: Contributor
timestamp: October 26, 2014, 01:16:16 pm
content: Unless you have a complete datasheet for that LCD, and have access to a board with a rather capable ARM or similar processor that can push out some data at some 20 MHz, forget that project and move on.// Per.
korad power suply  - Page 1
Forum section: electronics / projects

author: aneesh
author_rank: Contributor
timestamp: December 05, 2020, 03:36:48 am
content: Hi everyone,I have tried redesigning korad power supply as per attached circuit. the circuit works fine with volatges only the current keeps decreasing on the multimeter but the output of U6A is stable so the current display(ssd) is stable . it means the current on display is stable but when i check with multimeter on output the currents consistently decreases.plz advise a solution.
Korsar - Hardware Interface Debugging Tool - Page 1
Forum section: electronics / projects

author: Andrey.GCME
author_rank: Newbie
timestamp: May 08, 2025, 08:56:46 pm
content: Hello everyone.I started new project - Korsar - hardware interface tool, that is like BusPirate, but with no need for special hardware - its just a firmware for generic esp32, that is cheap and available everywhere (and you already have it at home, right?).Here is the link to github repohttps://github.com/gcme-bw/korsar.In this repository you can find code, docs and pre-built binary.For now it supports I2C and SPI in master mode, and later I plan to add more interfaces and features.I hope you like it

author: zapta
author_rank: Super Contributor
timestamp: May 13, 2025, 05:34:47 am
content: How did you create the ascii art headers at the top of the files?https://github.com/GCME-BW/Korsar/blob/master/data/lib/utils.js

author: Andrey.GCME
author_rank: Newbie
timestamp: May 13, 2025, 06:27:34 am
content: I used some online ascii art tool, I don't remember which one
KSE45H11 vs D45H11 - Page 1
Forum section: electronics / projects

author: akis
author_rank: Frequent Contributor
timestamp: May 11, 2016, 07:31:54 pm
content: Could someone please tell me the differences between the two transistors? D45H11 is made by multiple manufacturers, and the KSE45H11 is Fairchild only, but they also do the D45H11.

author: Scrts
author_rank: Frequent Contributor
timestamp: May 11, 2016, 07:50:48 pm
content: Include both parts datasheets.

author: LEDPaul
author_rank: Newbie
timestamp: May 12, 2016, 07:05:02 pm
content: Main difference is in package. Throughhole VS smd. Also abs max current is slightly different

author: edavid
author_rank: Super Contributor
timestamp: May 12, 2016, 07:08:21 pm
content: Quote from: LEDPaul on May 12, 2016, 07:05:02 pmThat is incorrect. They are both in TO-220 and have a 10A ICrating.https://www.fairchildsemi.com/datasheets/D4/D45H11.pdfhttps://www.fairchildsemi.com/datasheets/KS/KSE45H.pdfMy theory is that Fairchild started selling parts with the D45H11 mark after they acquired GE/Harris/Intersil's discrete lines.

author: LEDPaul
author_rank: Newbie
timestamp: May 18, 2016, 06:48:16 am
content: I stand corrected. The KSE45H11 and D45H11 are indeed both TO220 and Ic=10A.The KSH45H11 (and MJD45H11) comes in the TO251 and TO251 (IPAK and DPAK) and has max 8A collector current

author: Kleinstein
author_rank: Super Contributor
timestamp: May 18, 2016, 04:03:57 pm
content: They are similar, but the D45H11 has a better specified SOA, especially at higher voltages. SO the KSE45 is more the switching type.

author: akis
author_rank: Frequent Contributor
timestamp: May 18, 2016, 04:16:40 pm
content: Quote from: Kleinstein on May 18, 2016, 04:03:57 pmDo not think so. The datasheet charts appear to be copies of each other. In the D44H11TU sheet it is mentioned the KSE45H as the complimentary, even!I tend to think they are simply different factories or production lines or somesuch. I believe that the specs are perfectly equivalent. But if anyone knows how to contact Fairchild we would be able to solve this mystery.

author: Pjotr
author_rank: Frequent Contributor
timestamp: May 18, 2016, 04:58:29 pm
content: D44xx and D45xx and variants are pretty common industry standard power transistors. Much like the 2N3055 was once a standard power horse. They come from various manufactures and plants, like the various 2N3055 variants did. How the thing in reality performs you know when you use them. But if you stay away from its boundaries it all doesn't matter much.
KSZ8775 SWITCH , AM6254 SoC RMII wiring details MAC to MAC - Page 1
Forum section: electronics / projects

author: Smile2016
author_rank: Regular Contributor
timestamp: August 23, 2025, 02:51:24 am
content: Has anyone used these specific chips in RMII mode : the KSZ8775 switch and the AM6254 SoC? I’m a bit unclear on the wiring details. Any details on MAC-to-MAC wiring would be very helpful. Thanks!

author: amyk
author_rank: Super Contributor
timestamp: August 23, 2025, 05:58:18 am
content: Does table 3-11 of this help?https://docs.rs-online.com/e5bc/A700000008632899.pdf

author: Smile2016
author_rank: Regular Contributor
timestamp: August 23, 2025, 02:48:20 pm
content: Quote from: amyk on August 23, 2025, 05:58:18 amyes Amyk it does , TABLE 3-12 and TABLE 3-7 . I have both ports SW4 and SW5 connected as per table. In RMII not MII. still no success
KTS1662 Single-Chip OVP, alternatives? - Page 1
Forum section: electronics / projects

author: thinkfat
author_rank: Unknown
timestamp: October 19, 2019, 07:13:04 pm
content: Hi,while searching for overvoltage protection ICs I found this part:https://www.mouser.de/datasheet/2/936/KTS1662-04d-1634486.pdfIt fits my requirements, but I'm wondering if there isn't a solution that is more hobbyist friendly than a WLCSP-12 package. This thing is super-tiny, just 1.28mm x 1.94mm. While I'm not afraid of soldering, this would be a new level for me.I'd not consider it if it wasn't _exactly_ what I'm looking for.
KV7RF SMD Datasheet - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: April 21, 2019, 11:00:42 am
content: Can someone identify a 6-Pin IC SMD with the marking code KV7RF? Searching in Google I didn't find anything. Any help on this?

author: DaJMasta
author_rank: Super Contributor
timestamp: April 21, 2019, 05:46:15 pm
content: Don't have a part number for you, but SMD codes aren't usually that long, maybe some subset of the code is what shows on the datasheet. Definitely a switching converter, though, if you can ID the in/out voltage and the pinout, you may be able to make a good guess at a replacement, at least.

author: amyk
author_rank: Super Contributor
timestamp: April 21, 2019, 06:00:38 pm
content: SY8089AAACLook at pictures from those who sell them to confirm.

author: sdancer75
author_rank: Frequent Contributor
timestamp: April 22, 2019, 10:39:43 am
content: Quote from: amyk on April 21, 2019, 06:00:38 pmIt seems to be the same IC... I will check this out!Best Regards,
Kweld power cycling fault - Page 1
Forum section: electronics / projects

author: Dreddi
author_rank: Newbie
timestamp: September 09, 2023, 09:38:13 pm
content: I've got my Kweld put together and I've been able to make two small 3 cell packs with it and its fantastic. I went to use it the other day and it does a normal power up cycle, beep, then shut off and start an endless boot loop. If I let it sit for 10 min or so unpowered, it will stay on for a few seconds before it shuts down and start looping. If I'm quick enough in those few seconds I can get a pulse out of it before it start the loop. Different power supplies don't make any difference. It was connected to the KCap but even when connected directly to a battery or lab power supply it cycles. Only thing I've been able to confirm is the 3.3v cycles along with everything else.I'm not sure if anyone else has run into this but I can't find anything via a search that is even remotely similar. I've sent a tech request to the Kweld contact but I've got no response.

author: tautech
author_rank: Super Contributor
timestamp: September 11, 2023, 03:23:34 am
content: Ask the maker in his development thread for help:https://www.eevblog.com/forum/projects/guesses-on-what-i-am-attempting-here/
KXTJ3-1057 accelerometer issue. - Page 1
Forum section: electronics / projects

author: VK3DRB
author_rank: Super Contributor
timestamp: March 11, 2024, 12:23:45 am
content: Hi.I am using a KXTJ3-1057 accelerometer with an MSP430G2533.Using I2C, I can read the device ID (WhoAmI) and it appears I can write to the device. The I2C waveform looks fine on the oscilloscope with its I2C decode function.InitI2C(MEMS_ADDR);memsData = 0x22; // Set CTRL_REG1: Standby mode, low current, acceleration data as interrupt, Range +/-2g, Wake-up function enabledI2C_Master_WriteReg(MEMS_ADDR, 0x1B, memsData, 1);memsData = 0x18; // Set INT_CTRL_REG1: Physical interrupt pin enabled, polarity active high, interrupt pin latch until cleared by reading INT_REL, no self test polarityI2C_Master_WriteReg(MEMS_ADDR, 0x1E, memsData, 1);while(1);The attached code should set the accelerometer's interrupt to trigger, but it does not when I move or shake the device. The interrupt output is always low. I don't know why and I have spent hours trying to find out why. The schematics are attached. On the MSP430, port 2.6 is set for interrupt triggering on a falling edge, set as an input with an internal pullup resistor.This is a long shot, but anyone who has had to use a KXT accelerometer, might know what is wrong. I will owe you a beer if you can help solve this.It is unfortunate I had to use this part. It was due to the global chip shortage - it was the only one we could get. In retrospect I would have used an ST or even a TI accelerometer, but it is too late now.

author: VK3DRB
author_rank: Super Contributor
timestamp: March 17, 2024, 06:44:42 am
content: Found the fault.The Salaea Logic Pro 8 has a bug. I set SCL is channel 4, and SDA to channel 7. The data it sniffed and reported was corrupted, leading me astray. Proved this by checking with data decode feature on the oscilloscope. Changed to channel 1 for SDA and channel 2 for SCL and the problem was gone!To make matters worse, there were a couple of effing spurious 8ns pulses at the falling edge of the clock. I thought this was ringing, but I could not see it on the oscilloscope. Nope, it was the Salaea Logic Pro 8 issue. When I moved to ch1/ch2, these spurious pulses disappeared!By the way, driving the KXT chip is a little complicated, but I have sorted all those registers out now the logic probe is "working".Feeling a lot better, thank you.
L and Resistor R function in a SMPS output nearby/vicinity  - Page 1
Forum section: electronics / projects

author: abdulbadii
author_rank: Frequent Contributor
timestamp: January 19, 2023, 03:35:53 am
content: What is the Inductor L and Resistor R function in a SMPS output vicinity below after transformer T output ?What are the two values supposed to be calculated with respect to each other and to the two capacitors i.e. C1 and C2||C3 ?SMPS rated as output 24V max 2.5 APlease help elaborate the real mechanism crystal clearly !

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 19, 2023, 04:05:55 am
content: Impossible to tell without more design information; what output, what transformwer?If this is like the output of a flyback, probably the L and C provide additional filtering, maybe the R is a leakage path so it discharges when off?Tim

author: Terry Bites
author_rank: Super Contributor
timestamp: January 20, 2023, 03:34:58 pm
content: I think it would be helpful to look at a mirror image of this diagram. Its conventional to show signal and power flowing from left to right.A rectifier feeding into a smoothing cap and a pi section LC filter is a very common configuration.seehttps://electronicscoach.com/pi-filter.htmlL and C values are chosen to obtain the desired attenuation of the switching frequency.I imagine the resistor creates a small load current.Regulators will often not function correctly below a minimum load current.
L core dual bobbin linear transformer vs EI, single bobbin. Lowest leakage induc - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: November 29, 2023, 02:35:18 am
content: Would an L+L core transformer have less or more leakage inductance than an EI core?And what about having the primary and secondary windings split and wound concentrically on both bobbins instead of having them split? would this lower the leakage inductance?

author: Konkedout
author_rank: Frequent Contributor
timestamp: November 29, 2023, 06:08:46 am
content: Generally speaking the greater intimacy you can get between primary and secondary windings, the less leakage inductance, the tighter coupling, and the more capacitance you will get. So the tightest possible coupling would be achieved by winding primary and secondary bifilar with each other so that every turn of bifilar wire has a primary and secondary wire together. Of course this is generally bad for isolation for safety or noise.Having two L cores together with each winding on a separate bobbin will give you relatively easy isolation but a lot of leakage inductance.
L-Edit forces one of my Metal 1s to be GND - Page 1
Forum section: electronics / projects

author: Ronny
author_rank: Contributor
timestamp: April 24, 2017, 12:53:13 am
content: Good night everybody,I am making a NAND gate in L-Edit for a project, but I am getting an weird bug.In the bottom of the circuit there are 2 metal 1's, one of them (the one in the bottom that is really long) is the true GND and another one connecting the source of the first NMOS to the drain of the second NMOS. For some reason when I extract the circuit L-Edit is forcing the piece of metal 1 that connects the two NMOSs to be GND.I have tried calling this piece o metal 1 Vx for example, but L-edit just ignores it and calls it GND again. When that happens the bottom NMOS is shorted out of the circuit.Can anybody help me please?Thanks a lot.

author: Ronny
author_rank: Contributor
timestamp: April 24, 2017, 12:58:06 am
content: I can't just change it in the extracted the file, because it will be a headache when I make my full project and it is there.

author: rfeecs
author_rank: Frequent Contributor
timestamp: April 24, 2017, 04:56:52 pm
content: Maybe you made a mistake in your layout?I would think the layout for a CMOS NAND gate is very standard.Yours doesn't quite look right. Seems like you have an extra substrate connection.

author: Ronny
author_rank: Contributor
timestamp: April 26, 2017, 01:48:17 am
content: Quote from: rfeecs on April 24, 2017, 04:56:52 pmHello,Thanks for your answer. I did, in fact, change the layout. I initially thought it would be better this way because by joining the NMOSs I would have a different threshold voltage for the top one. Problem is that when I do that the bulk connection that would allow me to have the same threshold voltage for both NMOSs shorts the bulk of the top one to GND through the body. That was the problem.I ended up doing the standard one.Thank you.
l200 723 replacement - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: March 28, 2022, 09:14:21 am
content: hi all,i was going to build a 723 based psu using 6x 3055 pass transistors,is there a way to do the same but using a l200 ic in place of the 723?,0-30v and 0-15/20a would be good,has anyone a link to a schematic for this? TIA.
L200 circuit problem and safe limit ? - Page 1
Forum section: electronics / projects

author: MathWizard
author_rank: Super Contributor
timestamp: April 22, 2021, 05:21:54 am
content: I've needed more than 2/3 PSU channels for a while, so I made a L200 circuit from the datasheet. It's w/ a uA741 that should be providing a voltage to the L200, based on the L200 OP current.https://www.ges.cz/sheets/l/l200.pdfThe 741, if I understand the circuit, should try it's best to make Vn=Vp , and so it's OP will move a few volts, from Vp as needed. And the L200 is looking at the difference between is own OP voltage, and the OP from the 741......and comparing that to a ref of Vsc=0.45V. The math seems to work, and I can get LTspice to do about the same (w/ more op-amps/BJT as a basic model of a L200).But when it's wired up, the 741 is basically just acting as a buffer, turning the 100k pot, only moves it's OP by 2-3mV, and so the difference voltage to L200 is way off the Vsc=0.45V threshold.And so the L200 does not cut back it's OP V or ISo I unhooked the 741's OP, and applied my own voltage to the L200's Ilim, and it works. But the 741 still acts like a buffer, just matching to within a few mV of the load voltage, regardless of the 100k pot setting.I swapped in a new 741 and cleaned it and checked all the rest, same thing.In the middle picture, I would say the op-amp output should beVo = Vp - (Rf/Rn)*Rsc*Ilload

author: ledtester
author_rank: Super Contributor
timestamp: April 22, 2021, 07:40:54 am
content: What supply voltage were you using?Btw, a datasheet for the L200 with more explanatory text may be found by searching for the SGS application note "A DESIGNER’S GUIDE TO THE L200 VOLTAGE REGULATOR", e.g.:http://ni-cd.net/nicddownload/ApplicationNote_L200.pdfBe aware of potential formatting issues and typos, though. Anywhere you see "V5-2" should be interpreted as "V5-V2" and one place I saw the formula$$I_o = V_{\text{ref}}\left(1 + \frac{R_2}{R_1}\right)$$and it's clear it should the left side should be \$V_o = ...\$

author: MathWizard
author_rank: Super Contributor
timestamp: April 22, 2021, 09:24:44 am
content: Up to 24V, but over 15V. I've burned out poteniometers before, so I better check that, but it did seem to read as expected when I desoldered the 1st 741.And so far I never really set the voltage off from were it started near 10V.I used all 1W resistors , for just in case the op-amp goes real low.I figured copying the datasheet, I wouldn't need to breadboard it.

author: MathWizard
author_rank: Super Contributor
timestamp: April 23, 2021, 09:44:00 pm
content: The 100k pot reads 82k but is fine otherwise. Again with the OP of the 741 disconnected from the Ilim. So I tried my resistor sub-box, and that changed nothing, the 741 OP barely moves. I unhooked the 1k pull-up resistor, so it's not in parallel with the pot anymore, and that changed nothing, for DC on paper it shouldn't matter anyways right?So I rewired it for an LM358, and again, with the OP of it NOT connected to the Ilim of the L200, the OP actually went up to 10.1V from 10V.I've rechecked all the wiring and cleaned around all the solder joints So what am missing here?
L293D as MOSFET driver  - Page 1
Forum section: electronics / projects

author: hussamaldean
author_rank: Unknown
timestamp: March 08, 2018, 04:12:37 pm
content: Hi all,I finally gave up after one month of looking for mosfet driver here in Iraqso, I decided to use L293D as mosfet driver. what are the considerations shall I take while using it as mosfet driver ?Regards

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 08, 2018, 04:22:02 pm
content: Eww, the cure is worse than the symptom!Can you get regular bipolar transistors (say, BC846, 2N4401, 2SC1815 and complements)?These sort of building blocks should be helpful:https://www.seventransistorlabs.com/Images/Gate_Driver.pngTim

author: hussamaldean
author_rank: Unknown
timestamp: March 08, 2018, 04:26:18 pm
content: Quote from: T3sl4co1l on March 08, 2018, 04:22:02 pmI think I can get these components, but it will be large for 3-phase inverter

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 08, 2018, 05:35:44 pm
content: Quote from: T3sl4co1l on March 08, 2018, 04:22:02 pmwhats wrong with that?
L293D Zero Crossing  signal  - Page 1
Forum section: electronics / projects

author: Ray Hall
author_rank: Newbie
timestamp: June 29, 2021, 06:59:15 am
content: Hello, I have been using the L923D to generate a four channel zero crossing square wave signal, for test equipment I want to make a new design with two channels. I could just use two of the L923D but I want a much smaller component. Can anyone help with a alternative smaller version with just the two outputsHere is the current circuit design .Thank You Ray.
L293D/SN754410NE replacement. - Page 1
Forum section: electronics / projects

author: djsb
author_rank: Super Contributor
timestamp: March 18, 2023, 05:21:24 pm
content: The L293D/SN754410NE is getting more expensive and seems to be approaching the point when it may no longer be available. Are there any more modern replacements available that are easy to use are more efficient for battery applications (preferably with MOSFET rather than bipolar devices)? I've had a look at the TI DRV range that are available as modular PCB's on Pololu's website, but the pages are full of warnings and the chips seem to be quite delicate. These drivers are for student use where I work (mainly Arduino and PIC MCU applications using bipolar steppers and small DC motors) so they need to be fairly robust. Any suggestions? Thanks.P.S I've attached the datasheet for the DRV8844 that TI says is of similar functionality but with a different pinout. How difficult would it be to swap to this chip from the L293D? And is there anything both popular and actually in stock?

author: Terry Bites
author_rank: Super Contributor
timestamp: March 19, 2023, 05:55:25 pm
content: The old drivers can be put in a socket, that seem like a real advantage in a prototype environment.Or make yourself a batch of breakout boards.How about STSPIN240?

author: djsb
author_rank: Super Contributor
timestamp: March 19, 2023, 06:12:36 pm
content: I've been looking at DRV8833 and DRV8836 over the weekend. I might try one of Adafruits modular boards. I doubt if I can make one myself for the price. No rush yet, but I just want to have something ready for later.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 19, 2023, 06:19:57 pm
content: TB6612FNG is nice, works well from 5V power up to 12V power, minimal voltage drops within the device. Pins have same functions as those on L293D, but very diferent locations. Might not be in stock at present as chips (TSSSOp style SMD), but sellers who have it on breadboard compatible carrier boards have them in stock.
L298 (better) alternative - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: March 27, 2020, 12:04:15 pm
content: Hi,any suggestions for an alternative to the classic L298? Just looking for a overall "better/newer" on (I know loose definition)Thank you

author: H.O
author_rank: Frequent Contributor
timestamp: March 27, 2020, 01:46:37 pm
content: I suppose it depends on the exact application and if what you're looking for is a drop in replacement or not but the LMD18200 is one device that springs to mind (that I've actually used). It's a single bridge though, not double as the L298N. Don't know if it's much newer than then L298 but it is at least an alternative you could look at.Texas Instruments DRV8873 is certainly newer, can handle higher current but at a slightly lower voltage, again only a single bridge though.Allegro A4950, 40V 3.5A in a small 8pin package but again, single bridge.For step motor applications the ST L6470 or one of the Trinamic chips might be Worth a look but then we're pretty far away from the L298.Go to Digikey and browse toIntegrated Circuits (ICs) > PMIC - Motor Drivers, Controllers

author: ricko_uk
author_rank: Super Contributor
timestamp: March 27, 2020, 01:50:36 pm
content: Thank you H.O!I forgot to mention that it is a stepper motor application

author: rvalente
author_rank: Frequent Contributor
timestamp: March 27, 2020, 02:28:27 pm
content: Quote from: ricko_uk on March 27, 2020, 01:50:36 pmThere is a bunch os steppers controllers integrated with dual bridges, with very cool Technics to drive steppers. Does your project require great performance like the gecko drivers offer? You could reverse engineer them, I believe they're cpld based

author: ricko_uk
author_rank: Super Contributor
timestamp: March 27, 2020, 02:43:17 pm
content: Thank you rvalente,no, just a stepper motor controller with the classic PULSE/DIR (not serial comms), current control/limit, temperature control, enable and fault detection.The part suggested by H.O is interesting but has serial comms instead of pulse/dir.Any other suggestions?Thank you

author: rvalente
author_rank: Frequent Contributor
timestamp: March 27, 2020, 02:57:58 pm
content: Well, A4988 and DRV8255 are extremely common since they are used a lot in 3D printers, thus they're a cheap and you can buy them in break out boards.Toshibas TB6560 and TB6600 are beefier, commonly used in milling machines, if you need more powerWould these satisfy your requirements?
L298 Mosfet alternative - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: June 12, 2020, 07:36:54 pm
content: Hi,There are plenty MOSFET H-Bridge motor drivers but cannot find an equivalent/replacement for the classic L298 (https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf).I need it to:1) be able to control every every half bridge independently so for a full bridge I can have all 4 combinations (high or low for each side)2) ideally up to 60V but can compromise to 35V3) 1.5A minimum but preferably 2AAny suggestions?Thank you

author: fourtytwo42
author_rank: Super Contributor
timestamp: June 12, 2020, 07:47:15 pm
content: Took me 5 seconds to turn up the L6203, anything wrong with that if you found it already ?

author: wraper
author_rank: Unknown
timestamp: June 12, 2020, 07:53:39 pm
content: Say DRV8876https://www.ti.com/store/ti/en/p/product/?p=DRV8876RGTR&HQS=OCB-tistore-null-storeinv-invf-store-octopart-wweor DRV8874 for lower heat dissipation.

author: picburner
author_rank: Frequent Contributor
timestamp: June 12, 2020, 08:07:01 pm
content: Or LMD18200 3A 55V H-Bridge, or LMD18245 with integrate dac.

author: ricko_uk
author_rank: Super Contributor
timestamp: June 12, 2020, 08:28:23 pm
content: Thank you allForgot to specify it needs to be SMD. But the DRV8876 works very well. Thank you all!
L298 thermal pad connection - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: June 12, 2020, 02:14:12 am
content: Hi,the datasheet for the L298 (https://www.sparkfun.com/datasheets/Robotics/L298_H_Bridge.pdf) shows the pad for the Multiwatt package shows that the tab is connected to ground but the same datasheet does not say anything about the thermal pad of the PowerSo version.For lower impedance and for routing purposes I would prefer to connect it to ground but not sure if I should do that.I was going to test it with a meter but then thought that even if the meter shows continuity, the silicon inside might not be designed to support high current going to the pad and might fuse. Does anybody know if it should be left unconnected?Thank you

author: wraper
author_rank: Unknown
timestamp: June 12, 2020, 02:38:25 am
content: Quote from: ricko_uk on June 12, 2020, 02:14:12 amIt will not pass much current if resistance is higher than through the pins. Should be safe to connect to GND. As die should be the same, it should be connected to the pad the same way as to the tab in multiwatt. Tab is not necessarily connected to the GND pin though. Also you may want connect it to GND mostly not because of routing but because you can use the whole ground plane as a heatsink. But I don't suggest to use this IC to begin with. There are better more modern alternatives with MOSFET output stage which have lower losses/heat dissipation and on top of that often are less expensive.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: June 12, 2020, 05:58:20 am
content: I've got some memory that pad's like these (usually?) can be connected to the voltage rail which the datasheet says it's connected to, but it should not be relied upon to pass much current.That was for a completely other chip though, where the tab was connected to the positive or negative voltage rails.It may have been for the LM3886.Also:L298 is an obsolete chip that just refuses to die.Biggest problem is you loose a few Volt for the high current motor connections.For about the same price you can get similar chips with MOS-Fets that have a low enough Rds-on to not need a significant heat sink at all, because they just pass (almost) all voltage to the motor. These usually only need a bit of connected copper on the PCB for heat dissipation.
L4970A design formulas? (DC DC switch) - Page 1
Forum section: electronics / projects

author: Ricardodavinci
author_rank: Contributor
timestamp: October 09, 2013, 07:55:31 am
content: Hello! Anybody who is familiar with the L4970A 15 pin multiwatt switch regulator? I've searched the net trying to catch up some formulas to calculate the optimal values for external parts (like dave does in the video "designing a switching DC DC converter"). But all I can find is the datasheet containing some test circuits.

author: tszaboo
author_rank: Super Contributor
timestamp: October 09, 2013, 07:14:19 pm
content: AN245?http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00003929.pdfLooks like some medieval regulator though.

author: Ricardodavinci
author_rank: Contributor
timestamp: October 09, 2013, 10:57:53 pm
content: Nope, its a more modern type, up to 500kHz switching frequency. Link to digi-key:http://www.st.com/web/catalog/sense_power/FM142/CL1456/SC355/PF63204?referrer=70071840

author: tszaboo
author_rank: Super Contributor
timestamp: October 10, 2013, 02:57:04 pm
content: Did you look at the AN I sent you? It is dated back to 1995. it also costs 15 USD in single quantity, and comes in a package which requires heatsink, and through hole components. I mean you can save a fortune in production with something like a LTC3824 and a half decent mosfet. And the 35V 10A looks good, but with 85% efficiency, you need to dissipate 22W. So unless you are building a one-off and you found this under the bench, I wouldn't recommend this.
L6203 Short after soldering. - Page 1
Forum section: electronics / projects

author: vmarfus2
author_rank: Newbie
timestamp: April 22, 2014, 03:36:09 am
content: Before soldering, no pins are shorted as per my multimeter, but after quickly soldering the chips on to some perfboard, OUT1 and OUT2 short with Vs. Is this normal?I do not believe so, as it was not present before soldering. All I did was solder the things at 320 deg. Celsius for a maybe 2 seconds a pin. Are components not supposed to be made to handle soldering temperatures? I am so confused, and if they are burnt, along with my $20 US, how am I supposed to solder them then?

author: Skimask
author_rank: Super Contributor
timestamp: April 22, 2014, 03:41:56 am
content: How about some clear, close up pictures so we can point out the solder bridges you've made?

author: vmarfus2
author_rank: Newbie
timestamp: April 22, 2014, 03:50:29 am
content: Quote from: Skimask on April 22, 2014, 03:41:56 amNo bridges to point out. This is one of the chips. On both only those pins were shorted and no others, and only after soldering.

author: Skimask
author_rank: Super Contributor
timestamp: April 22, 2014, 05:05:20 am
content: Take a look at the datasheet, page 1.Follow your out1/2 pins to vss.How are you reading this "short"?

author: pmbrunelle
author_rank: Regular Contributor
timestamp: April 22, 2014, 05:16:03 am
content: OP, you may be forward-biasing the mosfet body diodes with your ohmmeter.Try measuring the resistance in the other direction instead.

author: miguelvp
author_rank: Super Contributor
timestamp: April 22, 2014, 05:27:58 am
content: Also make sure you are measuring the right ones from this picture (Out1, Vs and Out2)The left ones will be (Enable, Sense & VRef)

author: vmarfus2
author_rank: Newbie
timestamp: April 22, 2014, 05:29:57 am
content: Quote from: pmbrunelle on April 22, 2014, 05:16:03 am^posted while I was typing, took the words out of my mouth.Pins tested using a continuity buzzer on the multimeter. Traced the vs to the output pins, and saw a diode in the line connecting the vs line to both of the output pins, so I went to text weather the buzzer was going on the soldered ones due to the fact that I had the + lead on output and - on vs, but when I tested both directions, it now did not go off. It seems that the transistors "leaked" when they were still hot from the soldering, and now that they have cooled are operating normally without just conducting with the absence of a base voltage. Issue solved itself. Thanks for the help anyway, I know it is hard to be patient with newcomers to the whole thing.edit: Also the diode may have been more sensitive when heated and let current through.but it was probably the transistors, as I am sure I measured the conductivity in both directions when this problem arose.
L6562 PFC controller with constant off time...arming voltage of the ZCD pin? - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: July 07, 2018, 12:25:16 pm
content: Hello,The circuit on page 17 of AN1792 (R8, R9, C6, C7, D3) makes the L6562 PFC controller operate with Constant Off Time.The power FET of the converter is switched on when the ZCD pin of L6562 (pin 5) voltage falls below 0.7V. The FET subsequently gets switched OFF when the Current sense resistor voltage breaches the sense threshold. However, the ZCD pin voltage must rise above 1.4V so that the ZCD pin is again “armed”. –But supposing that the ZCD pin has not risen above 1.4V when the current sense threshold is breached (this would happen when ON time was short). What would happen in this case.The attached is a LTspice simulation of the Constant off time circuit. You can see that the voltage on the ZCD pin takes time to rise up above 1.4V.AN1792 Fixed off time controlled PFC regulators:https://www.st.com/content/ccc/resource/technical/document/application_note/cc/e2/9f/39/ad/27/4d/7e/CD00004484.pdf/files/CD00004484.pdf/jcr:content/translations/en.CD00004484.pdfL6562 datasheet:https://www.st.com/resource/en/datasheet/l6562a.pdf
L6562 PFC controller with constant off time...can this also be done with L6564? - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: July 07, 2018, 02:38:47 pm
content: HelloPage 4 of AN1792 (below) shows how the ZCD pin of the L6562 PFC controller can be used in making the L6562 operate in Constant Off Time mode.Do you think that the L6564 can be used in the same way?The ZCD pin of L6564 is certainly identical but we just wondered is there any hidden function which may mess things up here?L6564 DATASHEEThttps://www.st.com/resource/en/datasheet/l6564.pdfL6562 DATASHEEThttps://www.st.com/resource/en/datasheet/l6562.pdfAN1792https://www.st.com/content/ccc/resource/technical/document/application_note/cc/e2/9f/39/ad/27/4d/7e/CD00004484.pdf/files/CD00004484.pdf/jcr:content/translations/en.CD00004484.pdf(sorry this question appears related to my previous but in truth, the intricacy means the questions seem better separated)
L6564 PFC controller with slightly  modified operation... - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: July 07, 2018, 09:20:14 am
content: Hello,We wish to make a power factor corrected product with the L6564 PFC controller.It’s a fixed power level, so we just want to be able to fix a voltage on the COMP pin of the L6564 and run it like that.Do you think the attached method will be OK to do this? We are worried that some internal feature of the L6564 will not allow this to work?
L86 GPS Design for I2C - Page 1
Forum section: electronics / projects

author: Mert Buyukbas
author_rank: Newbie
timestamp: January 15, 2025, 11:33:05 am
content: Hello guys. I am working a project that I use L86 m33 Module. Than I found a schematic as a opensource.İs these schematic work? And may I use L86 m33 module as a I2C with this schematic?Thanks for help.https://soldered.com/product/gnss-gps-receiver-l86-m33/?srsltid=AfmBOooYuOsD3x-e9ugBpbxrAN8Tsrp-SJerva1V5Hxe2lrUDL7jjdO-https://magaza.deneyapkart.org/tr/product/detail/deneyap-gps-ve-glonass-konum-belirleyici
L9822EPD - Octal low side driver. Is there a second source? - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: September 08, 2021, 11:53:19 am
content: Does anyone know if there is a second source for L9822EPD?

author: SM3VLC
author_rank: Newbie
timestamp: September 13, 2021, 09:03:41 pm
content: What is your primary source?Mouser currently has them in stock.If you only need a few, I can part with a few that I have on the shelf.

author: AndersJ
author_rank: Frequent Contributor
timestamp: September 14, 2021, 03:48:15 am
content: My primary sources are Mouser and the other "regular" sources.Last time I looked, Mouser had none in stock,and today they have 560 and 11400 on order.Do you see something I cannot see?Thanks for the offer, but I need several hundred devices.

author: SM3VLC
author_rank: Newbie
timestamp: September 15, 2021, 07:55:49 pm
content: Ok, my bad. I missed the "on order" text. Just saw the number.I don't have them in hundreds, only about 20 or so.You could try and check with Westcomp.https://westcomp.seWe use them at work and they source most of our components.
Relocating high amperage power supply output - Page 1
Forum section: electronics / projects

author: HooRide
author_rank: Regular Contributor
timestamp: November 30, 2019, 07:36:19 pm
content: I found a NiB Agilent N5764A for so cheap I couldn't help but buy it. Now, I'm wondering if anyone has any clever ideas on how to route the rear-mounted buss bar outputs of the supply to the some easy to connect/remove posts I can mount to the underside of my lab bench.The supply is capable of 20V 76A but realistically, I'll be using it for less than 30A. Also, I'd be nice to route the sense wires to the new posts as well.

author: james_s
author_rank: Super Contributor
timestamp: November 30, 2019, 07:46:42 pm
content: That shouldn't be difficult at all. You can buy heavy wire at a good hardware store or automotive/4x4 shop, the sort of thing you'd use to wire up things like starter motors, winches and audio amplifiers. They will also have crimp connectors suitable for large heavy wires. Given the remote sensing capability you might not even need anything crazy, 6AWG copper wire is good for 101A in chassis wiring, which is effectively what this will be given the short distance.

author: HooRide
author_rank: Regular Contributor
timestamp: November 30, 2019, 08:00:23 pm
content: Quote from: james_s on November 30, 2019, 07:46:42 pmThanks for your reply james_s!Sorry for not being more specific. I have plenty of cable and crimp connectors and am more interested in the binding post hardware itself. I'm envisioning 2 heavy-duty posts for negative and 2 for the positive rail on an 'L' bracket I can mount to the underside of my bench. If something could be purchased instead of made, that'd be preferred.

author: james_s
author_rank: Super Contributor
timestamp: November 30, 2019, 10:27:09 pm
content: Ah, yeah I don't know, I'm sure somebody out there must make a product like that. If it were me I'd just get a piece of aluminum angle stock and drill a few holes to install binding posts and screw that to the underside of the bench.
Lab Bench Power Supply 36v,6A Design With B3606 - "Easiest Design ?" - Page 1
Forum section: electronics / projects

author: Kedar264
author_rank: Regular Contributor
timestamp: February 08, 2016, 03:04:32 pm
content: Here's My Lab Bench Power Supply Design Using B3606 (Dc-Dc) Step Down Power Converter.Watch The Videohttps://youtu.be/b_mpgc_I5FUHere's The Specifications For This Power SupplyInput Voltage 6V~40V (For B3606 Module)Output Current 0~6AOutput voltage 0~36VOperating Temperature ?40?~+85?Display resolution 0.01VThe minimum resolution of power Display 0.001WThe current regulator / display resolution 0.001AThe minimum resolution of capacity 0.001AHOutput Ripple ?50mV# B3606 Manuelhttps://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwivjKrjt-jKAhUBWo4KHTzZDhoQFggcMAA&url=http%3A%2F%2Fwww.mhinstek.com%2Fpdf%2FUser%27s%2520manual%2520of%2520B3606.pdf&usg=AFQjCNFWLRB3QZEYMg0zI0BtM5UhTG48pQ&sig2=9Xu8bcfulHSwVJC702EYnAPlease Tell Me Your Suggestions .Thank You

author: Cloud
author_rank: Regular Contributor
timestamp: February 08, 2016, 05:29:21 pm
content: Have you checked how much riple, does the PSU have?

author: ZeTeX
author_rank: Frequent Contributor
timestamp: February 08, 2016, 06:01:26 pm
content: its not a good design if you ask me.1. where does the blower fan takes air from? from those little hole on the side of the case? its barely gonna take some air, also after where will the air that will heat up by the heaksink will escape? and why the fans blows air on the back side of the heat sinks? would it be better to just solder the power devices to a bigger heatsink outside the case?2. output is just short copper wire? really?3. its all hot glued and and very stable..4. the ac power plug connector is all wobbly and can break the solder connection..its looked like a slap toghetor in 5 minutes supply, just buy some borads from ebay how glue them and you get a "lab bench power supply". it doesnt have a current limiting feature, would be nice if it would have one.anyways I dont like it. its not desigend properly. sorry

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 08, 2016, 06:04:02 pm
content: Quick and very dirty. I love it!