hybridfree/eevblog-posts huggingface dataset:
Status display for a pumping station - Page 1
Forum section: electronics / projects

author: calzap
author_rank: Frequent Contributor
timestamp: October 17, 2024, 04:11:07 am
content: This isn’t a complex project, but there were a couple of mistakes and lessons learned. I have a pumping station on a canal about 0.4 km away from a pond that receives the water. There is a pump house near the pond that pumps water from the pond for irrigation. The pumping station has been in operation for 20 years and has performed well. It pumps about every 5th day during the 6-month growing season, which is when the canal is running. Originally, I envisioned being able to start the pump remotely. But there are so many actions to be taken and variables to be observed before the pump can be started that a person must go out to the station and start the pump manually.Once the pump is running, we’re concerned about monitoring that it continues to run, and if it stops, what is the reason before we go out to try to restart it. When underground power wiring to the station was laid-in, I had the foresight to also lay-in two 6 x 18 ga. tray cables and an RG-6 coax. So, this year, I finally got around to using one of the tray cables to send signals to a pumping station status indicator in the pump house.The ladder diagram for the pump controller is the first pic. The second is the schematic of the status indicator. Third is the external of the terminal box and status indicator in the pump house. Fourth is the insides of the terminal box and status indicator. Terminal boxes at pumping station and pump house are virtually identical.First mistake, embarrassingly, was not initially having the two diodes seen in the schematic and 4th picture. So, the LEDs didn’t work as expected until the diodes were installed. The second was less obvious. With only the 24 VAC power wires having power, some of the LEDs lit dimly and inappropriately. I suspected having a 400 m run of multiwire cable with continuous 24 VAC in one pair of wires induced power in adjacent wires. A couple of EEVBlog forum members suggested 1000-ohm resistors across the LED wires to dissipate the unwanted power. That did the trick. The bodgy resistors can be seen in the 4th pic.After the fixes, the status display has worked well. The pump house is visited many times per day. So, if the alarm on the status display sounds, it will be noticed without much delay.Mike
Status LED doesnt work on Battery-Management MCP73832T - Page 1
Forum section: electronics / projects

author: luca0074
author_rank: Contributor
timestamp: September 22, 2021, 12:38:21 pm
content: Hi allI implemented 2 LEDs in my design, which should indicate the Status as seen in the Datasheet:https://www.mouser.ch/datasheet/2/268/20001984g-846362.pdfI used the MCP73832T-4ADI/OTAs for the LED i went with: APHBM2012LZGKSYKCSee Datasheet:https://www.mouser.ch/datasheet/2/216/APHBM2012LZGKSYKC-786356.pdfThe LEDs are booth not lighting up at 5V VBUS, at any Status of the MCP.Is there an easy to spot design flaw?

author: luca0074
author_rank: Contributor
timestamp: September 22, 2021, 12:45:08 pm
content: I just realized, as rereading my post, that i choose the false Batterymanagement IC in my BOM.I wanted the MCP73831, so i can display the status "Charge Complete".So is my issue related to the false IC or are there any other problems?
Status of LM3915 logarithmic bargraph display driver - Page 1
Forum section: electronics / projects

author: mcovington
author_rank: Regular Contributor
timestamp: November 17, 2019, 02:46:52 pm
content: I just noticed that American suppliers are saying the LM3915 is discontinued. This is not an immediate problem for me because I have about a dozen of them. But I also notice that the '3915 is abundant in China. Is it still being made there?

author: Yansi
author_rank: Super Contributor
timestamp: November 17, 2019, 03:09:00 pm
content: Yes, it is some kind of chinese produced copy, seems to be working well - at least the 2 pieces I needed couple years back, when I wasn't willing to buy original one for the utter bullshit nonsense price.

author: mskeete
author_rank: Contributor
timestamp: November 19, 2019, 11:03:22 am
content: Have you got a link to the Chinese copies?I've been buying off eBay but would prefer a more dependable source

author: ebclr
author_rank: Super Contributor
timestamp: November 19, 2019, 11:16:47 am
content: https://s.taobao.com/search?q=LM3915&type=p&tmhkh5=&spm=a21wu.241046-global.a2227oh.d100&from=sea_1_searchbutton&catId=100
STC3100 current sense resistor - Page 1
Forum section: electronics / projects

author: ACertainIdioticEngineer
author_rank: Newbie
timestamp: September 17, 2020, 12:59:22 pm
content: Good day.I'm currently designing a BMS for my diploma work and ran into a Problem with the coloumb counter. As mentioned I'm thinking about using the STC3100 however i was unable to find any usefull information about how to either tell it the value of the sense resistor or how i can calculate the resistense.Did anyone already worked with that Ic? I searched the Forum but there was only a single entry.regardsFabianattached: BMS Layout (just for testing for now)Datasheet:https://docs.rs-online.com/7d41/0900766b812941c9.pdf

author: ace1903
author_rank: Regular Contributor
timestamp: September 17, 2020, 01:41:35 pm
content: You have +/-80mV input voltage range. You need to take maximum current that load will consume and chose Rsense = 0.08v/Imax.Basically maximum charging/discharging current and 80mv max voltage drop dictate Rsense value. Higher Rsense better precision but if you saturate input will get imprecise measurements..
Steady state error between type 1 and type 2 compensator  - Page 1
Forum section: electronics / projects

author: Patrick66
author_rank: Regular Contributor
timestamp: April 06, 2024, 08:22:19 am
content: Hello everyone, currently I'm trying to simulate an LED driver with flyback configuration in DCM mode. The output current is around 0.7A with 18W output power. The problem that I'm currently facing is that the time to reach steady state is higher when using a type 3 compensator compared to a type two compensator. Wanted to know whether this is normal or wrong because if not mistaken using type 3 compensator is better for the overall performance of the system. The system has a phase margin of 90 degrees when using a type 2 compensator whereas the phase margin is around 125 degrees when using a type 3 compensator and both having the same cross-over frequency. The figure of the circuit and simulation is shown below. Hope that you can enlighten me and correct my mistake. Thank you in advance for the help.

author: Someone
author_rank: Super Contributor
timestamp: April 06, 2024, 11:22:51 am
content: Why do you think they have the same crossover frequency? In the other thread you said you didn't know how to model the feedback loop.

author: Patrick66
author_rank: Regular Contributor
timestamp: April 06, 2024, 11:37:04 am
content: Hello Sir, I have tried to learn how to model the feedback loop as shown in the figure below.
Steam released its tracking technology for free - Page 1
Forum section: electronics / projects

author: kamtar
author_rank: Regular Contributor
timestamp: September 16, 2020, 10:42:38 pm
content: Thought that I will share it here as it seems like it can be a total 180 degree on one of our possible projects which we were ready to refuse because it was too complex.Steam is now offering its tracking technology for free for commercial use (I didn't read the license agreement yet)https://partner.steamgames.com/vrlicensingThere are sensor ICshttps://triadsemi.com/product/ts4112/and it seems like there are some modules:https://tundra-labs.com/shop/tl448k6d-vrI expect that anchors/base stations will be sold only as complete products and thats where they will make their money on it.

author: TheMG
author_rank: Frequent Contributor
timestamp: September 17, 2020, 01:36:29 am
content: Quote from: kamtar on September 16, 2020, 10:42:38 pmAnd also from VR games and applications being sold through the Steam platform, as I imagine the major use case for the technology will be the development of various in-game VR accessories.I would be willing to pay for a VR tracking collar for my cat, so that the cat appears in the VR world and I can avoid stepping/tripping on it when playing VR games!!!
steel conduit pipe and inductance - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: April 12, 2025, 09:49:28 am
content: I was reading about submarine cables and I thought that to some effect, running wires in a conduit will have an effect on their impedance in a weak way (vs submarine telephone wire).The idea is you can use a loading coil for telephone lines, or basically wind them with mu metal or permalloy tape to essentially turn it into a very long 'bead' inductor, so you don't need physical inductors.https://www.imoa.info/download_files/molyreview/excerpts/16-2/Molypermalloy.pdfI don't have long LCR meter cables to try to measure a conduit in my house, but I am wondering if anyone tried to measure this effect?

author: jonpaul
author_rank: Super Contributor
timestamp: April 12, 2025, 02:59:01 pm
content: Check Bell Laboratoire 1920s..1960s extensive research and analysis of submarine , ariel and long line cables, equalization, loading coils.Same with power D&T , see works of Charles Proteus Steinmetz GE R&D, 1900...1920s.Highly recommend his text books on transient electrical phenomena and alternating currentJ
Steel phone case? - Page 1
Forum section: electronics / projects

author: Jon86
author_rank: Frequent Contributor
timestamp: June 23, 2013, 09:57:56 pm
content: This is probably a ridiculous question, but what would happen if I were to encase my phone completely in a steel box, say 1mm thick? I'm guessing the signal would be blocked out altogether, but would there be a way round this? I'm just thinking of a way I can work-proof my Lumia. Thanks

author: JackOfVA
author_rank: Unknown
timestamp: June 23, 2013, 10:00:15 pm
content: Yes, the signal will be greatly reduced, probably to the point of non-usability.Try a non-conducting enclosure, such as Lexan (polycarbonate) or the like.

author: Jon86
author_rank: Frequent Contributor
timestamp: June 23, 2013, 10:02:47 pm
content: Thanks for the info.Lexan looks promising, how easy is it to work with?

author: Jon86
author_rank: Frequent Contributor
timestamp: June 23, 2013, 10:17:25 pm
content: Okay I just bought two sheets of 1.5mm Lexan, do you think this will be strong enough to be chucked around without getting damaged? Also does anyone know what glue I should use to put it together?Sorry for all the questions, it's not really the right forum for this is it

author: bilko
author_rank: Frequent Contributor
timestamp: June 24, 2013, 12:32:36 am
content: Google "vacuum forming". You should easily be able to make a mold to vacuum form the sheet

author: amyk
author_rank: Super Contributor
timestamp: June 24, 2013, 11:19:26 am
content: Oddly enough I wonder if people whobuy things like thesewonder about their reception suddenly getting a lot worse...
Steering a crystal with a better clock source? - Page 1
Forum section: electronics / projects

author: @rt
author_rank: Super Contributor
timestamp: December 06, 2020, 06:41:34 am
content: HiI have a crystal clocked microcontroller with capacitor arrangement much like any other.I’ve heard years ago that if I have a better clock source (in this case TCXO with TTL output),it’s possible to attenuate that, and connect it directly to the clock input pin with the crystal still in place,and that the new signal will correct the crystal oscillator to become a more accurate clock.If this is true, does it matter that the TCXO is TTL?With some series resistance, will it drag down the original crystal much when the TCXO circuit is switch off?I ask the second question because I assume the TCXO is a drain on batteries while it’s operating heating up a resistor oven.Cheers.

author: @rt
author_rank: Super Contributor
timestamp: December 06, 2020, 06:51:15 am
content: Well Dah! I just don’t see how this happens without dragging down the original crystal (when the TCXO is unpowered).

author: Gregory
author_rank: Regular Contributor
timestamp: December 06, 2020, 06:53:49 am
content: Yep, It can workIt's called Injection Locking.Actually, it is more common to sync a much lower phase noise oscillator to a better one, like a crystal.You will need to test some resistor values and maybe put a parallel resistor with the crystal.A parallel resistance will decrease the high crystal Q making it easily steerable.In a lot of cases a very short pulse is used to lock the oscillator. A short pulse will inject a smaller amount of energy.Also, a short pulse has more "temporal" information and I think will increase the chance of lock.A short pulse of energy can be injecting coupling the oscillators with a small capacitor.

author: CJay
author_rank: Super Contributor
timestamp: December 06, 2020, 09:28:49 am
content: AS gregory says, injection locking is a thing.However, you seem to be confusing TCXO with OCXE, a TCXO monitors temperature and (typically) changes circuit reactance for it to keep the frequency stable.An OCXO keeps the crystal at a constant temperature by using heating elements.So, you may find the TCXO is well within your power budget.
Steering wheel control (SWC) interface of BOSS Audio in-dash multimedia devices - Page 1
Forum section: electronics / projects

author: Romualds
author_rank: Contributor
timestamp: June 06, 2023, 09:45:02 am
content: I'm considering upgrade audio system of my 2-nd gen Sienna and going to buy BOSS Audio Systems Elite BE9ACP.I'm wandering if there is any information about steering wheel control interface of BOSS car audios? For Jensen devices there is the information that they has analog input and voltage levels needed for each particular command are documented in the user manual.If BOSS devices also had analog input with different voltages I could develop interface board for translating voltage levels from steering wheel buttons of my Sienna to levels needed by BOSS device. I just don't want to spend more then $50 just for voltage level translator I can develop by myself.Any information will be highly appreciated.
Stefan Kohler: wild variation on "manhattan" component mounting - Page 1
Forum section: electronics / projects

author: nzo
author_rank: Regular Contributor
timestamp: October 11, 2011, 09:28:11 pm
content: Came across this among a series of excellent videos on constructing Stefan's CamSlider project. The vid is the 2nd one down:http://www.stefankohler.com/film/clips/Enjoy
Stencil design - Page 1
Forum section: electronics / projects

author: Rusty
author_rank: Newbie
timestamp: September 28, 2015, 07:03:54 am
content: A mate of mine has just created a tool for creating stencil apertures for consistent aperture reduction for thermal pads and any other larger pad areas.It creates a X by Y grid pattern based on Pad dimensions, total area required (% of pad) and number of square apertures that make up the grid.Check it out and see if you like ithttp://www.pastereducer.com-Its a prototype, (EDIT: Only the diagram) doesn't like small numbers so maybe multiply your dimensions in mm by 10 or 100For any other bugs/issues you can reply here but it might be better to use the email on the site.
STEP-7 PLC on the RaspberryPi - Page 1
Forum section: electronics / projects

author: krautguy
author_rank: Newbie
timestamp: June 07, 2017, 09:54:13 pm
content: A couple of years ago I started the Awlsim project:https://awlsim.de/https://bues.ch/a/awlsimIt originally was only designed as a research effort to simulate a few simple non-realtime STEP-7 programs on a PC.However today we're able to run STEP-7 programs on real hardware (like the Raspberry Pi).The project is fully Open Source and Open Hardware, if you consider the PiLChttps://bues.ch/a/pilcas hardware. However the hardware of PiLC is not something to be proud of, yet.The software performance in contrast is pretty good by now.Awlsim/PiLC is able to run about 100k AWL/STL instructions per second on the Raspberry Pi. (There still is a lot of room for improvement).There also is preliminary support for FUP/ FBD language programs.The system can be connected to a Profibus-DP (experimental) LinuxCNC (works pretty well) system.I would be happy to get your feedback and flames.--Michael Buesch

author: krautguy
author_rank: Newbie
timestamp: July 31, 2017, 08:11:45 pm
content: Version 0.56 of the Awlsim Soft-PLC has just been released.It includes major improvements in the experimental Function Block Diagram compiler and editor.

author: Vtile
author_rank: Super Contributor
timestamp: July 31, 2017, 09:17:03 pm
content: Isn't profibus a closed form protocol. I think some existing opensource project didn't have it because of some form of legal problems.Nice project, I will definedly try it out as AWL is fun to tinker with and I happen to have one unused RPi.How close the registers are simulated compared to S7-family of hardware?

author: krautguy
author_rank: Newbie
timestamp: August 01, 2017, 06:20:39 pm
content: > Isn't profibus a closed form protocol.Yes, it is.The Profibus-DP module is just a very minor part. It exists just because we can. Although there are people using it for small projects.> How close the registers are simulated compared to S7-family of hardware?The AWL interpreter is supposed to be fully S7 compatible for the defined semantics of S7.Undefined things like the content of uninitialized temp memory are different in Awlsim.Another difference is that Awlsim does not support UC/CC instructions with functions and function blocks that have an interface. But that shouldn't be used in S7, too. So there are no plans to support that.See this file for a short S7 compatibility summary:https://bues.ch/cgit/awlsim.git/plain/COMPATIBILITY.md?h=master

author: krautguy
author_rank: Newbie
timestamp: November 11, 2017, 06:38:25 pm
content: Awlsim version 0.58 has just been released with a lot of new features w.r.t. Function Block Diagram support (FUB/FBD).
Step by step approach: How to acquire a still image in CMOS Image sensor? - Page 1
Forum section: electronics / projects

author: kankanas
author_rank: Contributor
timestamp: March 20, 2021, 07:11:17 am
content: Hello,I need to understand step by step approach to capture a still image through CMOS Image sensor.I understand the functionality of CMOS Image sensor, i.e first the photons will hit the photosensitive layer of the sensor and depending on QE of APS, charge will be converted into voltage, amplified and following ADC Conversion will lead to digital value.But to test the actual image sensor, I need to understand what to connect(external interface and device) with which port of the CMOS Image sensor device . How to perform The readout ?I am looking forward for help.Thanks and Regards,kankana
Step down 48v input POE to 4 outputs 3.3v/5v/12v/custom - Page 1
Forum section: electronics / projects

author: Stealthrt
author_rank: Regular Contributor
timestamp: January 03, 2020, 06:10:44 pm
content: Hey all I have been searching for a already-built solution that would output 3.3vdc, 5vdc and 12vdc @ 5a. I have found that here:However the issue is that I will be feeding this 48vdc (POE) and it seems that the max this thing can take in is 40v.Do you think it will be fine with 48v? Is there anything I could add to the board so that it can take up to 50v?LM2596 datasheet:https://www.ti.com/document-viewer/LM2596/datasheet***Across post:https://forum.allaboutcircuits.com/threads/step-down-48v-input-poe-to-4-outputs-3-3v-5v-12v-custom.166040/https://www.electro-tech-online.com/threads/step-down-48v-input-poe-to-4-outputs-3-3v-5v-12v-custom.158171/

author: andy3055
author_rank: Super Contributor
timestamp: January 03, 2020, 06:21:52 pm
content: 48 volts will be too high for those regulators. Also the caps are 50 volts max. Not sure if any of them are on the input side and if they are, there is not enough safety margin.

author: Stealthrt
author_rank: Regular Contributor
timestamp: January 03, 2020, 06:43:38 pm
content: Quote from: andy3055 on January 03, 2020, 06:21:52 pmCould I exchange the LM2596 with LM2576 (http://www.ti.com/lit/ds/symlink/lm2576.pdf)? That ladder seems to be tolerant up to 60v.

author: Vovk_Z
author_rank: Super Contributor
timestamp: January 03, 2020, 07:29:03 pm
content: There is "HV" version of those dc-dc IC. It has 60V max.

author: andy3055
author_rank: Super Contributor
timestamp: January 03, 2020, 08:29:47 pm
content: Yes, as Vovk_Z stated, you can do that. But I thought you wanted a ready made thing. If you plan to replace the regulators in what you buy, you need to consider the other stuff also like the caps and anything else there may be. Then the whole idea of "ready made" goes out the window!In this case, you might as well design your own circuit based on the HV versions of the regulator as in the spec sheet you referenced. Why buy something that you need to modify? Not to mention you will be replacing the most expensive parts on that board. Does not make any sense.

author: ttt
author_rank: Regular Contributor
timestamp: January 03, 2020, 08:55:42 pm
content: 1. Just to check: are you using real PoE (802.3xx) from a switch or just power injecting into Cat5/6 where you control the voltage? PoE voltages can go up to 57V. Ideally you should use 64V or better 100V rated parts for PoE applications.2. How much power do you think you will use? You will need a proper PoE PD controller chip (802.3at), rectifiers and a transformer to reliably achieve anything above 25W or so over Cat5.
step-down switching regulator high side switching - Page 1
Forum section: electronics / projects

author: Ravenghost
author_rank: Contributor
timestamp: April 14, 2016, 12:21:43 pm
content: Hello,My project includes digitally controlled step-down switching regulator(buck converter).Schematicsswitching frequency 100kHz, AD8211 current sense amp., 56k and 33k divider is a voltage feedback loop.After trial and error i realized that high side N-Channel MOSFET can't be opened with PWM signal powered by 5V MOSFET driver. And if my calculations are correct to open said MOSFET i would need to supply at least 27V to gate. So i searched for another solution and stumbled across Power Load Switch'es i.e.http://www.infineon.com/dgdl/Infineon-BTS5045-DS-v02_02-en.pdf?fileId=db3a30433162923a0131656bdff6417fwhich includes mosfet with a charge pump. But they are too slow with ON OFF times ranging 30-230us.So what could i use for switching part?

author: Ian.M
author_rank: Super Contributor
timestamp: April 14, 2016, 12:42:43 pm
content: Typically, power MOSFET gate drive is in the 10V to 15V range. For high power applications you'd normally use a high side gate driver IC that provides level shifting with under-voltage lockout and uses a bootstrapped supply referenced to the high side MOSFET source. When the MOSFET is off, a reservoir cap withe oits -ve side connected to source charges from a ground referenced rail (typically 12V) via a diode. When it switches on, the gate drive supply is from the reservoir cap. The duty cycle must have enough off time to keep the cap sufficiently charged.Lower voltage lower power applications tend to use a high side P channel MOSFET, source to Vin, driven by a simple low side gate driver. Max Vin is limited by the gate driver voltage rating and gate oxide breakdown voltage

author: Ravenghost
author_rank: Contributor
timestamp: April 14, 2016, 01:20:20 pm
content: Thanks for detailed explanation.Let's say i have 24V input and i want to convert it to MAX 14V and load would draw 1A which option would you recommend n-ch mosfet+high side driver IC or p-ch mosfet+low side driver IC?

author: Ian.M
author_rank: Super Contributor
timestamp: April 14, 2016, 01:47:40 pm
content: That depends: You'd need a P channel MOSFET with a Vgs rating of >30V and a 1A to 10A Idss rating, and a low side gate driver with a supply voltage rating >30V. You'll need to do some parametric searches at your preferred supplier(s) to see what's available. Don't forget to check Rds_on Then compare the cost against a N channel MOSFET, high side gate driver, external bootstrap diode and cap.N.B. if its an automotive application, its *FAR* easier to find a N channel MOSFET & high side driver with enough voltage rating to withstand the typical transients.
step up converter efficency doubts - Page 1
Forum section: electronics / projects

author: digik
author_rank: Regular Contributor
timestamp: May 20, 2016, 09:10:19 pm
content: I basically need to run a 30-34V led from a 14.8V Lithium-ion battery pack, so i need a step up converter. I found this on aliexpress:http://www.aliexpress.com/item/DC-DC-8A-Solar-Wind-Energy-Automatic-Step-Up-Step-Down-Constant-Current-Voltage-Adjustable-Power/32509748157.html?spm=2114.01010208.3.11.JSTZ6u&ws_ab_test=searchweb201556_8,searchweb201602_3_10017_10021_507_10022_10020_10009_10008_10018_10019_101,searchweb201603_6&btsid=ce55ac45-568e-4ff0-91cf-e8e25ff26581But since I need to double the voltage i'm concerned about the efficiency of this thing. The led need 1A of current. What do you think? Will i loose too much energy? I'm not into the step up technology, so every suggestion will be appreciated

author: uncle_bob
author_rank: Unknown
timestamp: May 21, 2016, 12:10:39 am
content: HiWithout buying one of the specific parts and testing it, there is no way to be sure of it's efficiency. There is no basic reason why a properly designed converter would *not* be above 80% efficiency. If you need better than that, shopping for random parts is probably not the best way to get the job done. To me the bigger issue is that you say you need 34V and the unit you are looking at is only good to 30V max....Bob

author: zlymex
author_rank: Frequent Contributor
timestamp: May 21, 2016, 10:31:20 am
content: I bought something similar in 2013, here is the photo and test result at that time. I use HP34401A DMM, IT6122 power supply and IT8512 e-load.

author: QuantumLogic
author_rank: Contributor
timestamp: May 21, 2016, 11:36:09 pm
content: I've used this converter in my project to charge Li Ion cells (4S) and to power an adjustable power supply control unit.12V input and 16.8V output at 1A for charging. Works great.And for the main supply, it takes the 12V to 16.8V battery as input and outputs 23.25V at around 2A.Totally adjustable voltage and current. Just don't short it out to set the current (it needs a real load like a high-power resistor).www.ebay.com/itm/DC-DC-250W-Constant-Current-Boost-Step-up-Module-Mobile-Power-Supply-LED-Driver-/251715894855
Step-up converter for LED - Page 1
Forum section: electronics / projects

author: LA1HSA
author_rank: Newbie
timestamp: July 11, 2012, 12:19:24 pm
content: Hi all,New to the forums, but have watched Dave's channel on YouTube for a long time. So much knowledge around here, so I hope I might get some good suggestions from some of youI've bought a 50W LED which I'll use as a photo light in the future. The specs are about 34V/1500mA for full power. I'm going to drive this from a 12V SLA battery, so I need a step up converter to get the 34-ish volts. Ideally I'd want about 35 volts so I can have room for a switching transistor (PWM control from a PIC). I could current limit the power supply, but for future expansions I want a stable supply and PWM a switch for dimming.I've been looking at some LT-series converters, but they are very hard to get in this country. So, do you have any wise suggestions for a circuit/package that can do this without too much "special" parts? A 3 amp version (or more) could also be interesting (this might be scaled up a lot if I like it).Appreciate all help

author: Psi
author_rank: Super Contributor
timestamp: July 11, 2012, 12:36:45 pm
content: Have a look at the TL494, it's really common, easy to get and can do inductor or transformer step-up.

author: poorchava
author_rank: Super Contributor
timestamp: July 11, 2012, 01:27:45 pm
content: Since you don't need galvanic separation from mains, I'd suggest to avoid transformer supplies. Pulse transformers are usually being designed for specific circuit (voltages, loads, capacitances, frequency etc). It's hard to buy standard one in reasonable price. You'd have to re-use something found in commercial power supply (hard to tell parameters in most cases) or buy/find a core and wind the transformer youself (not easy, not cheap).You generally don't need a converter which gives 34V, but rather one that maintains 1.5A through the load and able to achieve 34+V (voltage goes down for particular current as the led heats up). You may want to check LM3421, 3423, 3424,3 3429.

author: Psi
author_rank: Super Contributor
timestamp: July 11, 2012, 02:01:47 pm
content: If you can find a second hand car audio amp you should have all you need.They take 12V and step it up to around -30 -- 0 -- +30 or so.Also use a TL494 quite often

author: G7PSK
author_rank: Super Contributor
timestamp: July 11, 2012, 02:06:24 pm
content: Why not use 3 SLA batteries in series, that way you can use smaller size batteries and have a few volts over for your pic control.

author: LA1HSA
author_rank: Newbie
timestamp: July 11, 2012, 02:22:14 pm
content: Thanks for the tips!I'm having a look at the different packages now, but haven't decided yet. What G7PSK says might be an easy solution, at least for starters until I decide on the final optical product. Small SLA's are cheap and readily available here (already use a ton of them in my radio go-kits). Those batteries would also be better if I ramp it up to a cluster of 4x100W ones

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 11, 2012, 07:24:11 pm
content: Quote from: LA1HSA on July 11, 2012, 02:22:14 pmAh, polar nights...
Stepper drive block diagram - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: July 12, 2017, 04:09:51 pm
content: Does anyone have any insight of the topology of a stepper driver like the one in the link below (2060AC)http://www.steppermotorcanada.ca/stepper_motor_nema_34I would imagine the input supply gets full wave rectified and then used as the "bus" to power the FET's that switch the current to the stepper coils. I'm curious if there is a DC-DC stage between the input and the "bus".

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 12, 2017, 04:26:52 pm
content: i have smaller TB6600 driverhttp://www.ebay.com.my/itm/TB6600-Single-Axis-4A-Stepper-Motor-Driver-Controller-9-40V-Micro-Step-CNC-/282298461911?hash=item41ba4caed7:g:6vMAAOSw241YWhqNit uses TB67S109A driver chip.. some optocouplers and logic chip 74hc123d to interface to outside world... high voltage will go directly to the driver chip... inputs will accept logic level (3.3 - 5V)...

author: H.O
author_rank: Frequent Contributor
timestamp: July 12, 2017, 05:12:48 pm
content: There's most likely not a DC/DC converter between the input and the motor supply on that drive (it's only 60VAC max input) but there most likely IS one to provide the control circuitry with power derived from the "high" voltage.
Stepper Drivers from Trinamic (4361) vs ST L647X series - Page 1
Forum section: electronics / projects

author: Gibson486
author_rank: Frequent Contributor
timestamp: January 29, 2019, 02:45:14 am
content: Anyone have any experience with these stepper drivers? I would normally get a demo board from both and play with it, but they both seem like they require some substantial coding time. It seems like ST is trying to bite into the motor control market, while Trinamic has been there for a while. The biggest take away I have so far is that if I have an encoder, the Trinamic does it all for me while I have to interface it and make extra code with the ST part (however, cubemx kind of does it for you). Not only that, but with Trinamic, I could just get rid of 4361 Controller and go straight to their driver chip if I wanted more simplicity. Any thoughts?
Stepper motor driver. - Page 1
Forum section: electronics / projects

author: geggi1
author_rank: Frequent Contributor
timestamp: July 19, 2020, 12:20:51 pm
content: Hi i got some 400W stepper motors from a V-sat disc.I'm looking for a schematics for a homebrew driver to run the stepper.Motor data.4 poles48V11A8 wires to the motor.

author: ocset
author_rank: Super Contributor
timestamp: July 19, 2020, 03:26:44 pm
content: You could look up bipolar stepper motor driver.

author: mawyatt
author_rank: Super Contributor
timestamp: July 20, 2020, 02:01:48 pm
content: That's a hefty motor with 11a at 48V!!Pololu has various drivers and controllers for stepper motors which might be of help.Best,

author: rstofer
author_rank: Super Contributor
timestamp: July 20, 2020, 03:35:29 pm
content: AutomationDirect.com has a 10A 80V driver for about $260 but the voltage is too low. Read on...You probably want to run any stepper at a much higher voltage to overcome the stepping rate limitations caused by the winding inductance. The current rise time limits the steps/second - substantially!According to the article, you might want to run the motor at 10x to 24x nameplate voltage or somewhere around 480V to 1152V. At these voltages, winding insulation quality will be a huge issue.http://www.e-jpc.com/blog/?p=111If you don't need RPMs, maybe you can get by with something more conventional - like 80V.What happened to the original driver?

author: geggi1
author_rank: Frequent Contributor
timestamp: July 26, 2020, 04:20:03 am
content: It is some stuff i got of a Vsat antenna maintenance kit.I would like to build my own drivers to make a antenna rotator.

author: wizard69
author_rank: Super Contributor
timestamp: July 29, 2020, 01:07:19 am
content: I'm going to throw in the name Gecko here but I'm not sure they have 11 amp capable drivers.As for a DIY solution a search of the net might turn up something but to be honest I'd go to TI or one of the other chip manufactures that have devices that can drive external power transistors. Doing a DIY is non trivial but a driver chip may eliminate a good deal of the complexity. Here is one example:https://www.ti.com/document-viewer/DRV8711/datasheet/features-slvsc407873#SLVSC407873To get even passable performance out of such a stepper you really need to go beyond the simple control modes and leverage the various micro stepping and current control schemes.

author: geggi1
author_rank: Frequent Contributor
timestamp: July 29, 2020, 07:38:26 pm
content: I was looking for building my own driver, not buying something from the store.

author: wizard69
author_rank: Super Contributor
timestamp: July 30, 2020, 02:58:12 am
content: Quote from: geggi1 on July 29, 2020, 07:38:26 pmI guess it depends upon what you mean by building your own driver. The TI chip mentioned about requires significant design effort to get the complete system to work. Your alternative is to come up with a FPGA solution.
Stepper motor driver MC3479 is obsolete - Replacement suggestions? - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 14, 2018, 11:06:50 am
content: Any ideas on how to replace it?Pcb redesign is planned, a near equivalent device is OK.

author: jeremy
author_rank: Super Contributor
timestamp: February 14, 2018, 11:47:27 am
content: Best stepper drivers on the market are those by trinamic (tmc2100 series). Allegro A4988 or similar are cheaper but less featureful.
Stepper motor driver - Page 1
Forum section: electronics / projects

author: electronics-whiz
author_rank: Regular Contributor
timestamp: January 02, 2015, 10:02:59 pm
content: I have a mainboard from an old Epson dot matrix printer. I have some interest in building a stepper motor driver, this is looking like one of the better boards to salvage parts from.It has an STK 6722HZ chip, and heatsink for it. I found a diagram for it with google images, I couldn't locate a datasheet though. (Diagram is attached)This chip seems to be getting some input from a toshiba TMP90C041N. P17 on the STK chip seems to go to an epson ASIC.The toshiba one I mapped out first pin is for the STK chip, 2nd will be the toshiba. P5 (STK) ->P9 (toshiba), P6->P11, P13->P10, P14->P12.I'm not sure what the toshiba chip is as it seems to interface with the parallel port interface chips, a couple of things that look like RAM, and a EEprom, and a couple Epson ASICS that run transistors for a stepper, head, solenoid for paper hold bar. It's socketed like the EEprom so thinking it's some sort of a CPU type device.If it's simpler to go another way that's fine. The STK chip I think would be useful in another setup too. I just don't know how to get the inputs. I think most these stepper ICs need some sort of pulse rate, and I don't have that.I also saw a resistor and diode that looked like connected to the stepper's ground I don't know that's a safety or what.

author: ttodorov
author_rank: Regular Contributor
timestamp: January 03, 2015, 12:06:00 am
content: Are you doing this just to learn stuff, or do you have some specific application in mind, which needs a stepper driver?If it is the first, then first look atWikipedia Stepper Motor articleto learn how to create the pulses to drive a stepper. Then you can go find a small stepper with low power requirements likethis one: you can then drive it with a ULN2803 darlington transistor array and an arduino or an AVR chip or a PIC chip...If it is the latter, then what are the requirements? How can anybody tell if this IC will satisfy or even work for your needs? And anyway, I thinks that salvaging old chips to create a new solution in the case of stepper motors rarely works to your advantage. With the cheap Allegro A4988 or TI DRV8825 chips, there are readily available driver boards on the internet for less than US $10, that are very versatile and can handle small to medium loads (about 2A per winding). And you need only 2 outputs to drive them (direction and step pulse) as compared to 4 for your chip....So you get to choose which way you want to go depending on your needs.Regards,Todor

author: electronics-whiz
author_rank: Regular Contributor
timestamp: January 03, 2015, 12:13:54 am
content: I have no real application at this point. I have lots of stepper motors of various forms. Some 4 lead, some 6, this chip uses 6 which I saw somewhere will also run a 4 lead motor. At some point I'd like to find a way to use them for something like a homemade 3D printer, or run some things that printers have in them like pumps, etc.
Stepper motor Drivers replacement Australia    - Page 1
Forum section: electronics / projects

author: ianscott
author_rank: Contributor
timestamp: July 14, 2016, 12:29:09 pm
content: Hey guysIm currently in year 12 this year working on my final systems engineering project which involves stepper motors. I currently have two Nema 23 stepper motors similar to what is linked.http://www.ebay.com.au/itm/Hot-DC-24V-Stepper-Motor-for-Nema-23-Single-Shaft-12-6Kgcm-1-8Degre-4-Leads-56mm-/201605079486?hash=item2ef09961be:g:r54AAOSwL7VWl0V4I also have these stepper drivers (below) which I'm to impressed about the quality of stepping produced from the driver. I was looking at the Leadshine DM860 as a replacement, all units that I have found is located overseas. Would anyone know of a similar replacement driver located in Australia with a similar price and function set?http://www.ebay.com.au/itm/CNC-Router-1-Axis-Controller-Stepper-Motor-Drivers-TB6560-3A-driver-board-GO-/371474309278?hash=item567d98209e:g:C-EAAOSw5ZBWMJqzRequirements- Low noise when stepping- Smooth movement- Smooth Stopping (Less harsh stepping movements when moving a few steps) <-- I have tried different input voltages and different driver currents to try to prevent this- Micro stepping(Im located in Australia)ThanksIan

author: Photon939
author_rank: Regular Contributor
timestamp: July 14, 2016, 01:14:01 pm
content: Take a look at the Pololu style stepper drivers used in reprap (RAMPS board) based 3d printers. The motors may hiss slightly due to the coil PWM but they work quite well and do not need heatsinking unless you're running them near the maximum current.There don't seem to be as many resellers in AU compared to the US but I found this auction: (they cost about $1.10us each from china)http://www.ebay.com.au/itm/Stepper-Driver-A4988-DMOS-Microstepper-Heatsink-Tape-For-RAMPS-Prusa-I3-Arduino-/151924190719
Stepper motor for Line Follower - Page 1
Forum section: electronics / projects

author: s.mosfet
author_rank: Contributor
timestamp: February 12, 2011, 05:50:03 pm
content: i would make a Line Follower Robot,with LPC2103 and 2 stepper motor..but which should i use?Unipolar or Bipolar? and why?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: February 12, 2011, 06:05:43 pm
content: Probably bipolar.Bipolar gives you greater low speed torque, and it's simpler to drive.Unipolar usually gives you more steps per rev, and the torque curve is flatter across it's speed range although it's lower than bipolar. It's also a little more complicated to drive.

author: Unknown
author_rank: Unknown
timestamp: February 12, 2011, 07:20:00 pm
content: Unipolar's are easier to drive in terms or components needed.In any case, please read this (to start)http://ww1.microchip.com/downloads/en/AppNotes/00907a.pdfand the answer should become obvious.It would be great to learn the basics of stepper motors while doing this project.Here a stepper motor was used to rotate the sensor turret. It is using a PIC18F-something controlled by a PIC32MX-something over I2C. An external driver chip from ST was used.http://img11.imageshack.us/img11/7018/13052009319i.jpg
stepper motor IC faulting - Page 1
Forum section: electronics / projects

author: snarkysparky
author_rank: Frequent Contributor
timestamp: September 20, 2020, 09:25:00 pm
content: STK672-640This well designed stepper driver IChas only power grounds pinned out and also has a analog input to set the PWM current for the motor windings with a max val of 1.31V.I am trying to drive this vref with a D/A converter so software can set the drive current. But the IC frequently looses its mind at the beginning of drive with an overcurrent condition caused by it driving both windings of a unipolar stepper motor simultaneously.It wont work at all at low levels of vref.I really believe the issue is the ground lead voltage bump up when the FET turns on being seen be the vref circuitry as a sudden drop in vref. The app note only mentions setting vref by a pair or resistors with the low resistor connected directly to power ground. This would give a bootstrap effect to vref during the drop induced by high current flow.The power grounds go directly into the boards unbroken ground plane.The D/A output is some distance away and cannot compensate for the ground bounce when driving the motor.I came up with a scheme to add a summing op amp amplifier to the board which will add the local ground pin voltage to the D/A signal and help a bunch with keeping vref constant with respect to the die ground of the IC.But is there an easier way?
Stepper Motor Inductors - Page 1
Forum section: electronics / projects

author: gmi109
author_rank: Contributor
timestamp: January 23, 2015, 04:37:12 am
content: I have a question about the XYZ Printing Davinci 1.0 circuit board. I am trying to populate some missing components on the circuit board, and I am trying to figure out why they have put inductors in series with the stepper motor coils as shown in the picture. I don't have an LCR meter to determine what values they have put on the existing ones, so I am trying to figure out what values I need to put, or if I can just leave them out using 0 Ohm resistors. Any ideas why they have done this?

author: gmi109
author_rank: Contributor
timestamp: January 23, 2015, 05:23:55 am
content: I guess I hadn't considered that it could just be a ferrite bead. That makes sense now due to the general appearance of the package. From what I've seen of the motor drivers (Allegro A4988), they don't require ferrite beads on the motor outputs which is interesting, but I'll put them in there anyway just to keep from having any issues. I appreciate it thanks!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 23, 2015, 05:34:45 am
content: Appnotes rarely give EMI suggestions unless they're specifically talking about EMI. They don't know what you're putting their circuit into, and they don't care, so it's up to the end designer to make those decisions. Evidently, it was found useful to put them in, so, there you go.I would guess they're 3A+ (or at least whatever they have to carry) and 30-300 ohms (ferrite beads are rated by ampacity and the impedance at 100MHz). Probably anything in that size and rating will do.

author: gmi109
author_rank: Contributor
timestamp: January 24, 2015, 04:45:05 am
content: I see, I'm sure they knew what they were doing since this is a mass produced, commercialized printer. I'll split it right down the middle with a 160 ohm, 6 amp. Thanks for the help!

author: LukeW
author_rank: Frequent Contributor
timestamp: January 24, 2015, 07:18:29 am
content: Obviously you'll need to match the package size of the ferrite bead too... looks like maybe 1206?I've never seen anyone put that kind of high-frequency-attenuating LC network on a bipolar stepper driver before... seems to basically not be a bad idea though. And a lot of the hobbyist stuff on the market (eg. RAMPS) is utterly shit engineering.

author: gmi109
author_rank: Contributor
timestamp: January 25, 2015, 02:51:32 am
content: Yea, it seems like a decent board design, unlike hobbyist level 3d printer boards. I'm measuring package size with calipers, 1206 corresponds to 0.12 inches by 0.06 inches right? I'm also trying to measure the values of the ceramic capacitors and having no luck on my fluke 115. I'm guessing they are too small for the range of it, so I probably just pick a low value.