hybridfree/eevblog-posts huggingface dataset:
Easiest 24V LiFePO4 charger  - Page 1
Forum section: electronics / general

author: Purduephotog
author_rank: Regular Contributor
timestamp: July 15, 2025, 09:11:19 pm
content: I just blew up my bench top PSU- apparently they don't like salt water.About to head out to camp in 4 days and am looking for a replacement AC to charge the home made battery banks (they all have integrated BMS), but do not expose any balance leads).Is there anything conveniently small that might carry this? I'm going to dig and search after I post this (in addition to the searches I've already done) in hopes of a fast answer.Thank you.

author: David Hess
author_rank: Super Contributor
timestamp: July 15, 2025, 09:44:09 pm
content: So your batteries have 8 x LiFePO4 cells in series to make 24 volts, and a maximum charge voltage of 29.2 volts?29.2 volts divided in half is 14.6 volts. Can you gain access to the middle of the stack and use two 12 volt chargers?

author: thm_w
author_rank: Super Contributor
timestamp: July 15, 2025, 10:04:21 pm
content: Amazon -> 24V battery chargerLots of options.Commonly used on forklifts or commercial trucks.

author: Purduephotog
author_rank: Regular Contributor
timestamp: July 15, 2025, 10:48:40 pm
content: Yes, but I was using the benchtops CC/CV capability to cutoff at 28.4- which I don't think I can do without some sort of dedicated "smart" lifepo4 charger.Or am I just fried from the heat today?edit: 28.4V, so 0.1V under 'capacity' is what I'd had the PSU set to.

author: thm_w
author_rank: Super Contributor
timestamp: July 15, 2025, 10:54:04 pm
content: Quote from: Purduephotog on July 15, 2025, 10:48:40 pmA normal lead acid 24V charger will go to 28.6-29.2V, which should be fine. Or some of them claim to be specific 24V chargers for lifepo4, but the voltage is basically the same.

author: Purduephotog
author_rank: Regular Contributor
timestamp: July 17, 2025, 03:08:55 am
content: Not easily, I'm thinking I don't have heat shrink to put it back together again.I might have to go that route if I can't cobble together a safe cutoff circuit. Can't burn a cabin down.

author: David Hess
author_rank: Super Contributor
timestamp: July 17, 2025, 04:11:41 am
content: Then the easiest thing, if you have time, is to just buy a 24 volt dedicated LiFePO4 charger.

author: Purduephotog
author_rank: Regular Contributor
timestamp: July 17, 2025, 11:57:12 am
content: Trust me, that's in the 'todo' when I can get enough scrap to the yard to do so.Might be able to fix the benchtop if I'm lucky, who knows.
Back EMF protection 5V rail - Page 1
Forum section: electronics / general

author: Darlington
author_rank: Contributor
timestamp: June 23, 2025, 04:28:20 pm
content: I am trying to protect a 5V line from overvoltage.In detail, the line comes from the output of a Texas TPS2116 power mux.Looking at the datasheet, the maximum voltage between input and output must not exceed 6V.At the input to the mux, I have regulated 5V voltages, so no problem there.The mux output powers a few things, including some 5V ICs that could be sensitive to overvoltage.The same 5V is used to power external loads but is limited in current. My fear is that by powering small inductive loads, for example, the Back EMF voltages could break the MUX and the 5V circuits.Below is a photo of a blocking circuit.If I simulate this in LTSpice, the diode in series has no effect on the EMF transients produced by the inductor...How would you handle a situation like this in industry?

author: thm_w
author_rank: Super Contributor
timestamp: June 23, 2025, 11:34:54 pm
content: Just having a bit of capacitance on the output will help with ESD and spikes, as noted in datasheet: "If RCB is expected to occur, it is recommended to clamp the output or use a high output capacitance (about 100μF). This will prevent voltage spikes from damaging the device due to output inductance."If you know what your expected output inductance is you can test and see if 100uF is enough.The flyback diode drawn is correct, maybe you can show your simulation.https://www.arrow.com/en/research-and-events/articles/flyback-protection-diodesThe series diode would help protect the output, but, it depends if your output can tolerate the voltage drop or not.

author: mtwieg
author_rank: Frequent Contributor
timestamp: June 24, 2025, 02:08:24 pm
content: It's not clear how the inductive load is connected/driven, and how its back emf could possibly affect the 5V supply rail. Sharing the schematic would help a lot.
UK RTS meter deadline looming-Check your supply meter - Page 1
Forum section: electronics / general

author: djsb
author_rank: Super Contributor
timestamp: June 14, 2025, 10:37:52 am
content: A deadline of 30th June 2025 for anyone who has an electricity supply meter in the UK that uses Radio Tele Switching.Here is a what you need to know video describing the problemIt's something to do with certain radio frequencies that the meters use for communication being shut down in the UK (I think it mentions the LW band).It's worth checking if this affects you or anyone you know. It mentions maybe 100K people and many that are in remote areas.This page from energy UK is less alarmist about the situationhttps://www.energy-uk.org.uk/customers/the-radio-teleswitch-service-switch-off-what-you-need-to-know/
SAJ solar inverter and batteries - Page 1
Forum section: electronics / general

author: H.O
author_rank: Frequent Contributor
timestamp: June 06, 2025, 11:51:11 am
content: Does anyone here have hands-on expreience with the SAJ brand of solar inverters and battery storage?I've been quoted a solar system install with inverter and battery storage from SAJ which is a brand I've never heard of before (not that I'm very familiar with the solar industry but still). It's clear that it's a low(er) cost Chinese brand but they seem to have been around for quite some time. A similar (slightly lower actually) speced system using Sigenergy comes in at a 40% premium for which I could easily get a (used) 3458A - to put it in context.On paper it looks fine, same warranty as "all" the others, datasheets and manuals in English.The internet isn't really overflowing with technical reviews and Trustpilot shows, as usual, both 5 and 1 stars (which is true for higher tier brands, like Sigenergy, as well) and it seems to be more of configuration/set-up issues and the know-how of the installers than actual hardware blowing up or not working. Which, again, you can find about pretty much any brand.Am I being stupid for even considering this, saving several k€?
BMS-Design for parallel 48V Packs?  - Page 1
Forum section: electronics / general

author: KoF
author_rank: Contributor
timestamp: May 23, 2025, 04:28:49 pm
content: Hi,I have to develop a BMS for 14S batteries (Li-NMC). Later, up to 24 packs are to be installed in parallel. One pack alone has enough power to supply the application, the other packs only serve to extend the runtime.Ti (as an example) says that their BMS chips do not support this type of application and that you should think about charging and discharging paths yourself and use ideal diodes, for example.My idea was simply to find a BMS chip with a discharge and charge FET driver and to equalise the voltage of the packs before connecting them in parallel. Once they are connected, they will undergo the same cyclical loads... And since they are also equalised in terms of voltage, the charging and discharging currents should be distributed almost equally...I've looked at various commercially available rack-mountable 48V battery packs that support this (e.g. from Pylontech, AERL,...) and I can't quite work out how they've managed it. I can also see the DSG/CHR FETs, but I can't entirely tell whether they work as diodes or as switches and whether they are controlled directly from the BMS chip.As I also need certification for the system later on, I would also be unwilling to integrate an MCU into the control path so as not to be dependent on software versions...Does anyone have any experience with this or can give me some tips?

author: uer166
author_rank: Super Contributor
timestamp: May 23, 2025, 08:00:25 pm
content: Architecturally this is doable per your idea: individual BMSs, equalize voltage first, connect packs later. You'll find it very difficult to avoid using an MCU here, it's usually needed for standalone 48V packs. Something that might help cert is a "hybrid" approach: use MCU for things that require it, and redundant HW for the safety aspects of it (UV/OV/OC/OT/UT shutdowns).What specific standard are you planning to certify for?

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: May 29, 2025, 09:24:23 am
content: I worked for a startup, we made a 48V 13S4P Li-ion BMS for electric mopeds. We used TI's BQ76940, it can support upto 15S config.Its quite doable, you don't even need to go too far from the happy path. You will just need to actively balance the cells down to the same voltage (the BMS chip will handle it just fine), before connecting them together. I wouldn't really worry about the ideal diode situation, if your packs are off by a few mV, the currents won't really be that large to cause an issue.You will however need to use a microcontroller. Most BMS chips use some sort of digital interface (I2C, SPI, etc) to manage the charge/discharge and other fault parameters. The cell balancing also will need to be triggered by the MCU on the BMS chip. Its actually the easiest way out, the alternative would be making everything in analogue. Maybe more robust but you'll have to prove everything works.
Winding an RM10 flyback transformer - Page 1
Forum section: electronics / general

author: dch53
author_rank: Contributor
timestamp: July 08, 2025, 06:55:06 am
content: Hi.I'm building an MPS MPX2002-based flyback converter as part of a diy tube amplifier power supply. PFC and some of the downstream low voltage dc-dc converters are already operational. A 400V resonant converter is down the track.Most of the flyback converter schematic is based on that of the MPS Evaluation Board. The only difference in the flyback transformer is that it will need 4 secondaries instead of the single one in the evaluation board design.I've watched videos on winding flyback transformers and I've seen a manual winder used. The RM10 coil former with 12 pins is quite small (one secondary will need flying leads because I'll need 14 connections). The location of the pins makes it difficult to attach the former to a winder, with a washer and nut, for example. Not impossible though - some sort of collar might be needed.https://au.mouser.com/ProductDetail/EPCOS-TDK/B65814N1012D001?qs=%2FsLciWRBLmCf8wlHdbgnvg%3D%3DOnly 87 turns are required across 8 windings.Would it be feasible to wind the coil by hand?Any recommendations please?Thanks.

author: mtwieg
author_rank: Frequent Contributor
timestamp: July 08, 2025, 12:38:32 pm
content: Quote from: dch53 on July 08, 2025, 06:55:06 amOk so there are five windings.QuoteWait 14 connections means seven windings?QuoteNow eight windings??QuoteHard to say when the number of windings increases over time...I'm guessing the main difficulty won't be the winding or the bobbin (especially if there are 87 turns total, I doubt a winding jig is going to be very helpful), but the termination of the windings on the bobbin pins. It's going to get messy.On the positive side, bobbins, wire, and tape are very cheap, so you can retry as much as you like.What sort of insulation requirements do you have from primary to secondary? Any insulation requirements between secondaries? Is there a primary-side aux winding?

author: nctnico
author_rank: Super Contributor
timestamp: July 08, 2025, 11:06:49 pm
content: If you only need a few transformer, then winding by hand is doable. For small transformers this is tedious though. Typically I wind similar windings in one go instead of seperately. I also like to fixate the bobbin in something like vice or mount it on a screw so it is easely accessible.
HEF4752 IC description - Page 1
Forum section: electronics / general

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: May 17, 2025, 05:06:24 pm
content: HiI stumbled upon this document about HEF4752 inverter.https://open.uct.ac.za/server/api/core/bitstreams/d7e31d3a-5ea1-4abb-8d30-6b2e5f438139/contentI would like to know how does it work internaly, but there is little to no information about it. There is reference to Mullard Tehcnical Report, that i can't find.Does anyone have any information about it?

author: floobydust
author_rank: Super Contributor
timestamp: May 17, 2025, 05:59:59 pm
content: I did see Signetics/Philips:HEF4752 "AC Motor Speed Controller" (but nothing much for datasheets)HEF4752V"AC Motor Control Circuit" and App noteAN136

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: May 17, 2025, 08:17:51 pm
content: Thank you very much.I read it, there is a rather simplified description of how the circuit works inside. But then there's a lot more to it than I found. So once again, many thanks.

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: May 17, 2025, 08:19:49 pm
content: I'm interested in how the PWM modulation is done there, purely with logic. I would also like to know exactly how the "gear shifting", as they call it, works.

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: May 18, 2025, 08:34:42 pm
content: Isn't there someone, who undertands how this IC works? I read thaht AN136, but like there is somethnig missing to understand how does it internaly works. Isn't there some more detailed descrition how it works? Or how PWM modulation technique used in it can be made digitally?

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: May 19, 2025, 07:37:02 pm
content: Ok, so the HEF4752 internal decoder works like array with predefined values. So there is no easy or compact way to make PWM with counters and logic ICs. But it might be easy to implement in MCU like STM32.
Strange issue with FLT pin of LM74910 Ideal Diode IC - Page 1
Forum section: electronics / general

author: Jim from Chicago
author_rank: Regular Contributor
timestamp: June 20, 2025, 05:23:40 am
content: Weird issue I'm seeing with this LM74910 IC. The overcurrent protection does not work with 100k pullup to the main power path as shown in the pic. When I remove the 100k, the OCP works and trips at the expected value I have it set to. I don't understand how this 100k would have any influence. The block diagram shows it's just a FET that either grounds the FLT pin or opens it.Any ideas of how a 100k like this could cause the OCP function of the IC to fail? This is really stumping me. I double checked this on 2 different boards and it showed the same result. We want to potentially use the FLT pin as a power good flag. Is there something inappropriate about tying the 100k to the VS node? Appreciate any thoughts.

author: mtwieg
author_rank: Frequent Contributor
timestamp: June 20, 2025, 01:21:08 pm
content: Indeed that doesn't make sense.When you remove the 100K, how can you tell the OCP is working? Is there another pullup on FLT? Or maybe you're probing the TMR pin?

author: Jim from Chicago
author_rank: Regular Contributor
timestamp: June 21, 2025, 12:39:43 am
content: I am probing the output (OUT pin) so I can see when the OCP trips. I also have a current probe watching the total current going into the circuit. There is nothing else on the FLT pin, just the 100k either placed or not placed. I also tried a 10k and saw the same result. I have an eload to load the circuit.

author: Jim from Chicago
author_rank: Regular Contributor
timestamp: June 24, 2025, 05:23:08 pm
content: I tried using an external supply to bias the FLT pin, and I've observed that there is a dependence of the overcurrent trip point on the voltage at the FLT pin. The higher the FLT pin voltage, the higher the trip point. I'm going to try to get in touch with TI about this.

author: thm_w
author_rank: Super Contributor
timestamp: June 24, 2025, 10:25:45 pm
content: Check for short between pin 11 and 12.Check soldering that all pins are properly connected to PCB.

author: mtwieg
author_rank: Frequent Contributor
timestamp: June 25, 2025, 01:01:01 pm
content: Quote from: Jim from Chicago on June 21, 2025, 12:39:43 amOh right, duh.Do you notice anything changing about the behavior of the ILIM/IMON pins when changing the FAULT pullup?Yeah I would also ask about this on the E2E forums. It's either a damaged device, silicon bug, documentation error, or a some really big mistake on your part like wrong pinout on the part or bad solder joints (I'm guessing you've checked this already).
Rheinmetall curb charger - Page 1
Forum section: electronics / general

author: Marco
author_rank: Super Contributor
timestamp: April 28, 2025, 06:45:43 pm
content: Maybe someone else find this interesting, or maybe just exasperating, but I just noticed that Rheinmetall seems to have finalised their design for their curbstone integrated charger. There'sa manual and installation manual on their website now. Only designed for one type of curb now, but if it takes off it will be trivial to cast the module holder in other types of concrete curbstones. Pretty much every curb stone is wider than the holder.I think it's practical and hope it takes off ... though it might take dirt cheap Chinese knock offs to really take flight.Every curb opened up for fibre, should be being prepared for these too. If we had these 10 years ago, almost every street could have been prepared already (you can just put in unelectrified wire and install dummies on the curb, don't need to put in chargers immediately).

author: MaTkEOxjC
author_rank: Contributor
timestamp: May 19, 2025, 06:44:24 pm
content: I'm really curious and somewhat skeptical how this survices dirt and water ingress.It's in a zone with lots of road debria and also faced in a unbeneficial direction.

author: nctnico
author_rank: Super Contributor
timestamp: May 20, 2025, 11:50:43 am
content: Quote from: MaTkEOxjC on May 19, 2025, 06:44:24 pmAnd not to mention cat & dog pee and poo.

author: Simmed
author_rank: Frequent Contributor
timestamp: May 20, 2025, 12:43:50 pm
content: it will be so so so dirty, yikes

author: Gyro
author_rank: Super Contributor
timestamp: May 20, 2025, 12:47:40 pm
content: There seems quite a high probability that cars and delivery vans will mount the curb and put a significant mechanical load on them too.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 20, 2025, 01:43:54 pm
content: How is dirt and grit going to get out of the socket pins ?

author: Marco
author_rank: Super Contributor
timestamp: May 20, 2025, 02:29:34 pm
content: I was assuming they'd simply blast it out with a pressure washer after a customer report, but they specifically forbid that ... so dunno.
A cleaner, smarter LiFePO4 battery code decoder on BatteryDays.com - Page 1
Forum section: electronics / general

author: batterydays
author_rank: Newbie
timestamp: May 27, 2025, 08:51:35 pm
content: Quick tip for anyone fighting with LiFePO4 QR codes (CATL, EVE etc.)I maintain a small, vendor-neutral battery-data service – we don’t sell cells, so no “A/B/C-grade” games.BatteryDays Decoder does three things the common Gobel/Basen decoders don’t:Autocorrects OCR typos (0 ↔ O, I ↔ 1, missing characters).Exposes a 1-line embed widget and a free REST API, so you can pull results into a spreadsheet or test script.No cookies, no trackers – just static HTML + API.Give it a spin on one of your Gotion/Grade-B mystery cells:https://batterydays.comFeedback (weird edge cases, false positives, feature wishes) is very welcome – a mobile scanner and IR/SoH tools are next on the list.—Albert / BatteryDays
240W PD3.1 & PPS - opportunity for USB-C powered laboratory power supply - Page 1
Forum section: electronics / general

author: czbaterka
author_rank: Contributor
timestamp: April 05, 2025, 11:02:30 am
content: I recently discovered that PPS (Programmable Power Suupply) protocol for PD is a thing.PD3.1 seems to include PPS by default.That got me thinking why laboratory power supply modules like the DPS-150 are still not here for the 48V/5A standard?Tbh, I've not even seen 240W capable power bricks, yet (except for some proprietary laprop chargers).With PPS it should not even require buck converter, right?Maybe a good opportunity to develop such PS?

author: MaTkEOxjC
author_rank: Contributor
timestamp: May 19, 2025, 06:47:26 pm
content: https://www.crowdsupply.com/centylab/pocketpdThis is pretty much it.
Stihl AR2000L Battery with AP plug     converter to AK tools - Page 1
Forum section: electronics / general

author: Skydive
author_rank: Newbie
timestamp: May 13, 2025, 09:29:41 am
content: Hello you. Don't know if it's the right place to rise this question.Statring with a Stihl AR2000L backpack battery normally foreseen for a AP tool, if would like to adapt it ou convert to a AK plug with AK tools because I have a lot of AK tools already and only one AP.I can get a AK Battery and remove existing cells to keep the box as a plug that goes inside the tool, but I need technical help.Both are 36V but one has 1015 Wh, the other only 72 / 144 / 180 Wh.I would like to learn about the communication protocol between the tool and the battery (wire yellow and green).I would also like to know about the plugging.I already know it's not standard use and on my own risk ;-)Tell me also if there any chance to buy one such adapter anywhere even home made but working goodThanks for help
undocumented mobile broadband modems in Chinese inverters? - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: May 18, 2025, 12:07:05 pm
content: Here's the story:Rogue communication devices found in Chinese solar power inverters -https://www.reuters.com/sustainability/climate-energy/ghost-machine-rogue-communication-devices-found-chinese-inverters-2025-05-14/I'd be careful with the credibility of that article and wait for more information and confirmation by third parties. It wouldn't be the first time someone is pushing totally exaggerated stories, especially in the current environment of global politics.
Can an LDO be thought of as an RC filter with varying R?  - Page 1
Forum section: electronics / general

author: Jim from Chicago
author_rank: Regular Contributor
timestamp: May 28, 2025, 10:05:02 pm
content: I am in a situation where I may need to use an LDO in dropout mode where Vin will be equal to Vout. My understanding is that there will be little to no PSRR in this scenario. Is it fair to say this is because an LDO can be modeled as an RC filter where the R is the Rds(ON) of the pass FET and the C is the output capacitance? In the dropout region the pass device is being driven as hard as possible by the error amp and this lowers the R value of the pass device, which raises the cutoff frequency of the RC filter.One apparent benefit of operating intentionally in dropout mode is reduced impact of bandgap noise on the output. But another con is worse transient performance. Anything else to consider?

author: mtwieg
author_rank: Frequent Contributor
timestamp: May 29, 2025, 09:03:23 pm
content: Quote from: Jim from Chicago on May 28, 2025, 10:05:02 pmWell, if you start with the assumption that "Vin will be equal to Vout" then by definition you have no PSRR whatsoever...QuoteYes, if the pass device is a FET then this should be a reasonable approximation.QuoteYes I suppose that in dropout the bandgap reference for the feedback controller won't matter, since the feedback loop will be saturated. Though in this scenario I think bandgap noise would be the least of your concerns.
Inverter with multiple input voltages  - Page 1
Forum section: electronics / general

author: ptluis
author_rank: Frequent Contributor
timestamp: May 02, 2025, 08:50:42 pm
content: I want to buy a pure sine wave inverter that allows me to select the input voltage in a range of 12V-58V automatically or alternatively manually. From the little research I have done so far, I have only found inverters with fixed input voltages such as 12V, 24V, 36V or 48V. As I have several packs of these voltages, it would mean buying several inverters. Does anyone know of an inverter that does what I want, that could suggest me?Requirements:Input: Multi voltages auto ou manual selectionOutput: 220V-230V 50Hz pure sine wave and minimum 5000W, which allows the connection of electric motors, refrigerators, etc.Mainly it will be used for supplying power for a 1000W deep well pump, 2 Refrigerators, and eventually a 800W microwaveThank you
programmable pre+post regulator designs? - Page 1
Forum section: electronics / general

author: Magnethicc
author_rank: Contributor
timestamp: April 07, 2025, 05:11:45 am
content: Hi everyone,Does anyone have reference designs or schematics for power supplies with switching pre regulator + linear post regulator?Any power level will work but something around 100/200W focusing on the post-regulator will be lovely.Thank you!

author: mtwieg
author_rank: Frequent Contributor
timestamp: April 08, 2025, 12:00:30 pm
content: You can find lots of info on the design SMPS and linear regulators, but not so much on the combination of the two, because combining them doesn't really create any new challenges (IMO).Unless your application is something specific, like a variable output voltage or something...

author: abeyer
author_rank: Frequent Contributor
timestamp: April 08, 2025, 06:45:07 pm
content: Maybe check out the designs fromhttps://www.envox.eu/I think both the BB3 and their earlier power supply design used that kind of pre/post regulation in a programmable device.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: April 18, 2025, 12:57:35 pm
content: There is nothing special about pre regulators.Normally any regulator has a feedback line to compare the output voltage with some reference. With a pre regulatorhttps://duckduckgo.com/?q=tracking+preregulator+circuit&t=h_&iar=imageshttps://www.ti.com/lit/ta/sszt535/sszt535.pdfI like this design, as it uses the ubiquitous LM2596. It opens an PNP BJT when the output voltage of the pre regulator is high enough, which then signals this back to the sense input of the LM2596.https://www.eevblog.com/forum/projects/bench-power-supply-design
Riden RK6006/BT DC/DC module and Python script for controlling it - Page 1
Forum section: electronics / general

author: dzwer
author_rank: Contributor
timestamp: April 15, 2025, 12:21:36 pm
content: Very cute little DC/DC converter moduleI've bought it from BangGood for about 30 euro, including the shipping to EU:https://www.banggood.com/RIDEN-RK6006-or-RK6006-BT-60V-6A-4-Digit-Communication-360W-Adjustable-Digital-DC-to-DC-Step-Down-Voltage-Bench-Power-Supply-Buck-Converter-p-1992304.htmlThis is suitable PSU for it:https://www.banggood.com/RD6006-or-RD6006-W-LED-Switching-Power-Supply-S-400W-48V-or-DC12V-or-24V-or-36V-or-60V-8_3A-33_3A-Support-Monitoring-Transformer-Lighting-p-1594324.htmlThere are good reviews for it on the WEB, but not so much info in this forum.The main difference with the bigger brother RD6006 is the absence of battery charging and the time/date setting.With my Android 14 phone and their ANdroid App I couldn't connect to it via the BT...Here I reworked and uploaded a simple Python module for controllling it:https://github.com/dzwer/RK6006-Python-ModuleThis Python module allows to read and control the following options:- Switch ON/OFF the output and read the state;- V&A set and read Voltage and Current;- Output read Voltage, Current and Power;- OVP and OCP set and read Voltage and Current;- Read the output Capacity(in Ah) and Energy(in Wh) from the switching-on of the module;- Read the Internal and External temperature in Celsius and Fahrenheit;- Read the Protection Status: Normal, OVP, OCP;- Read CV/CC output mode: CV, CC;- Switch ON/OFF the Take Out option and read the state;- Switch ON/OFF the Boot Power option and read the state;- Switch ON/OFF the Buzzer and read the state.There is some kind of slew control and settling times for both rise and fall with different currents is about the same and is 200ms.There are no overshoots on enable/desable the output, nor on changing the output voltage.There are some small spikes on the output voltage, when step changing the load.
Growatt renders devices useless? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: April 06, 2025, 02:31:26 pm
content: Hi,i just watched a video, where the guy said that Growatt will update the firmware of his device, so it wont work with 3rd party batteries.Part at 25:00!Anyone heard of this?

author: fastbike
author_rank: Regular Contributor
timestamp: April 06, 2025, 09:27:19 pm
content: Use the Battery Emulator (man in the middle) so it no longer knows what exactly is hooked uphttps://github.com/dalathegreat/Battery-Emulator/wiki

author: nctnico
author_rank: Super Contributor
timestamp: April 06, 2025, 09:42:57 pm
content: Quote from: fastbike on April 06, 2025, 09:27:19 pmThat sounds like a bad idea. The reason Growatt stops supporting third party batteries is likely safety & liability related. That is not something you want to mess with.

author: Siwastaja
author_rank: Super Contributor
timestamp: April 07, 2025, 05:52:16 am
content: Any real info? A guy saying on random video that he thinks that Growatt is "working hard" to remove support (but apparently not removing it?) is a bit underwhelming. I mean, if they want to remove a feature, it is trivial to them to do it, no need to "work hard", so what is this BS?Removing a feature which was present on a product during sales and listed as an official feature of course is a valid reason for money back. Is there any proof that something like this is going on?
Initial forming of lead acid battery plates  - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: April 04, 2025, 12:00:57 pm
content: Just imagine I’m going to make a DIY lead acid battery using pure lead plates. How many ampere hours would it take to completely form those plates on initial charge, assuming the final capacity would be 100 AH?

author: Ian.M
author_rank: Super Contributor
timestamp: April 04, 2025, 12:22:10 pm
content: I think that's one of those 'cant get there from here' questions. Unformed lead acid battery plates aren't pure lead. They are acidified red lead oxide paste compressed into pockets in a metallic lead framework. While it *may* be possible to oxidise a pure lead plate enough to use it as a positive plate (though its more likely than not to disintegrate before it becomes usable), no amount of forming current through the cell is going to turn a solid pure lead plate into an effective spongy lead negative plate..Seehttps://www.mathscinotes.com/wp-content/uploads/2012/12/lead_acid.pdfwhich has formation charge for positive and negative plates.

author: indeterminate
author_rank: Regular Contributor
timestamp: April 05, 2025, 07:48:04 am
content: Hers one in progress.https://www.thebackshed.com/forum/ViewTopic.php?TID=14403&P=4theirs a heap of info on the nethttps://www.electrical4u.com/construction-of-lead-acid-battery/In the early days of the telephone system the battery's where assembled on cite using " plant type cells " solid cast plates.they where repairable on site.https://collection.tairawhitimuseum.org.nz/records/images/xlarge/6160/7f50a5bed00a1384cdb3ec2e835b9a3bf8cbbf95.jpghttps://www.mathscinotes.com/wp-content/uploads/2012/12/lead_acid.pdf
BTA40-600B, optocoupler and snubber - Page 1
Forum section: electronics / general

author: DanielGouvea
author_rank: Newbie
timestamp: March 29, 2025, 10:31:02 pm
content: I intend to design a microcontroller circuit with a BTA40-600B RD91 to control the power delivered to a heating resistor (220Vrms, 12Ω, 4KW). I thought about using the MOC3023 to mediate the activation of the BTA40, but I don't know if it is the most suitable optocoupler. Another question is about the snubber circuit. The load is purely resistive, so is a snubber circuit really necessary? Thanks for the help.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: March 29, 2025, 10:40:28 pm
content: Heating applications typically have a slow control loop. I have used solid-state relays with 100 ms PWM period.

author: Andy Chee
author_rank: Super Contributor
timestamp: April 03, 2025, 09:13:16 pm
content: A snubber is good design practice.As you’re only dealing with a resistive heating element, you can get away with an undersized snubber.For reference:https://rudys.typepad.com/files/snubber-e-book-complete.pdf
Test of 9V batteries ( 33 of them ) - Page 1
Forum section: electronics / general

author: Jiri Bekr
author_rank: Contributor
timestamp: November 28, 2022, 07:18:53 pm
content: Hello guys,Since 9V 6F22 are unfortunately still haunting electrical engineers, as some more sophisticated multimeters eat them by dozens, our agony and economic losses may become slightly better if we switch to better battery brand, or more suitable technology. Today, there is tens of 9V block batteries and accumulators, but only some of them are worth the money. And noone knows which ones. Well, until today.This video covers my instruments that eat nine volts one by one, and then talks about the test. Each battery type (zinc-carbon, alkaline, primary lithium, NiMH and Li-ion w/ USB and step-up) is described as where is it suitable, and what battery of this technology I would recommend.Unfortunately, I don't have yet results of cycle life for NiMH 9 volts. This will take some time. Eg. half an year ago, I released test of 196 AA batteries and started cycle life test immediately once videos came out. Today, these 86 rechargeables have only 300 cycles (and three have died), so it may take an year for nine volts to die so I would have the data. Therefore, please take in account, that NiMH is not yet thoroughly tested.Capacity test was performed at CC=10mA with 6,0V cutoff. Fully charged voltage was also measured, this is important for NiMH. Of course I let them sit for a week before taking measurement.Tested batteries were bought in Czech republic, central Europe, so not all of the listed batteries may be available in your market.The video link is here:https://youtu.be/pTnFdDpo2NQThumbnail of the video is not visible, so I added it to attachments.May you batteries never come dry, and may you instruments keep their ppms. Shall your last digit be stable, and datalogging uninterrupted.EDIT: It looks like YouTube is still processing the video after half a day. Original is 4K 60p, but now only FHD is available, and the quality looks to be 480p, so I apologize for that.

author: skyhawk
author_rank: Contributor
timestamp: March 30, 2025, 06:45:36 am
content: Thank you for your table of results, it helps provide a baseline for someone getting into this from ground zero.I've tested the EBL 8.4V NiMH "280mAh" batteries very cheaply available from Amazon in North America, and I got ~184mAh with a harder discharge than your testing, so I'd estimate they're right about the same performance as the ones you tested, other than the Duracells which appear to no longer exist (At least so far as I can find in Canada).
Undocumented LiFePO4 18S 16kWh battery pack - Page 1
Forum section: electronics / general

author: marekm
author_rank: Contributor
timestamp: March 25, 2025, 01:03:07 pm
content: Offered for sale here -https://www.olx.pl/d/oferta/magazyn-energii-lifepo4-18s-16kwh-57v-600a-CID628-ID121kPj.html- and I have talked to the seller, but they don't have any documentation, any identifying labels were removed, maybe it was part of some larger system. Does anyone here recognize this pack and have any details how to communicate with the built-in BMS, COM connector pinouts etc?

author: thm_w
author_rank: Super Contributor
timestamp: March 25, 2025, 11:38:33 pm
content: Its definitely part of a larger rack like this:https://www.vtacexports.com/poland/5-12kwhx12-lifepo4-battery.htmlBut huge, maybe custom setup.
Advice for equipment and powering small water irrigation system - Page 1
Forum section: electronics / general

author: electroniclearner820327
author_rank: Regular Contributor
timestamp: April 06, 2025, 07:40:08 am
content: Oh I will start by mentioning I am talking about DC power only in all of the following.I would like to pump water to crops around space of up to 1 acres. I have only just started planting so don't need to pump that whole space yet but that is potentially the area I will want to pump water.I am guessing that the area won't matter too much as the pump just has to pull from point A to point B? Maybe it would matter on a bigger scale where gallons and gallons were demanded in a short space of time but not the case here. Just a little consistent trickle will be fine.Also the land is on a slope so I guess I just have to pull it to the uppermost point and then I can just make channels around the crops for it to flow.As for the gear what will I be looking at getting?To power, as mentioned previously, I have a large solar excess in my van so it would be nice to use that but how can that be transferred practically to the land based system? I of course wouldn't want to accidentally drive off while plugged in. Are there simple ways to connect which are easy plug/unplug?Perhaps a push in plug and have the one side bolted to the ground for outside and other bolted on the van and if I drove off forgetting to unplug first they would just pull apart harmlessly?Or due to the low power demand would it just be as cheap and maybe simpler to buy a tiny solar panel to power the pump?Just looking at possible options. As the project of growing I could envision other things I may want to power and so tapping into the van's supply may be a better goal in that sense.Then just a pump of the correct size and some piping? For pump size I imagine a tiny one will do which is sub £20 from the looks of things as just a weak flow would be fine.So mainly just a case of how to harness the excess power from my solar/leisure setup in the van unless there are any other considerations I have overlooked which I would like to hear.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: April 06, 2025, 11:20:41 pm
content: You need to define what you want. How much water over what time? How high does it need to be pumped. What is the DC voltage and how much power can you van produce?
Best Bench Power supply 0>60v Dual channel 10A+ - Page 1
Forum section: electronics / general

author: zboltman
author_rank: Newbie
timestamp: March 21, 2025, 07:13:30 pm
content: OK, time to upgrade my power supply. There are lots of em at TEMU and ALIEXPRESS, but are they reliable?Need a dual channel, 0-60VDC, with 10amps minimum.I have searched the ads and forums and did not really find anything fitting to my specs.Any suggestions are greatly appreciated.TIA

author: Simon
author_rank: Unknown
timestamp: March 22, 2025, 05:38:45 pm
content: Don't double post please, you will not be popular.
bq Eval and BQ20z80 parameters Data Flash content - Page 1
Forum section: electronics / general

author: Davepix
author_rank: Newbie
timestamp: March 15, 2025, 02:26:41 pm
content: Comparing two units based on BQ20z80 using BQ Eval as one has some issues... or possibly parameters as flags don't seem to tell the story for what or why a unit is not working.I'm looking at the .gg dumps side by side and they are identical but the units perform differently, I'd like to point to hardware failure but wanted to be sure all parameters show up.Is FET control all coded and shown in Data flash as in Operation Cfg A = 0B28, Operation Cfg B = 1E60 or Operation Cfg B = 6440, Operation Cfg C = 0000 or is it that flashing the chip from bqEasy Setup for parameters as ZVCHG, PFIN and SYS PRES don't show up in the Data Flash .gg file?

author: jbb
author_rank: Super Contributor
timestamp: March 16, 2025, 08:07:25 pm
content: I can’t speak to ZVCHG etc., but have three thoughts.Firstly, check the errata sheet.Edit: sometimes there are substantial problems with a chip that can ruin your day. These may get fixed in a later silicon revision, which can lead to different behaviours from two ‘identical’ chips. Or the erratas may never get fixed :-(Secondly, I suspect these chips also have firmware inside, so have a look for any version numbers or even a firmware update button in BQ Eval.Thirdly, you may have a slightly damaged part on your hands. Sometimes when an offensive event occurs (eg ESD strike), it’s enough to alter part behaviour but not enough to cause an obvious failure. (Has happened to me before and made for a very frustrating few days.)

author: Davepix
author_rank: Newbie
timestamp: March 18, 2025, 08:20:46 pm
content: Thanks, I'm guessing you're on to something. I'm not exactly working on an ESD safe workstation and on one board I replaced the bq29312, on the other I replaced some FETs. Probably looking for trouble... and I don't really have a good way or knowledge of how to diagnose what is happening on the board.Yesterday I tested different combanations of ZVCHG, PFIN and SYS_Pres settings in BQeasy to see if I could get some predictability. I don't have a schematic and other than following traces which a few disappear beneath the ICs, just have to guess. What I can see though is if I hook an unadultrated board to the EV2300 I get Cfg A and B settings which I believe now based on the BQeasy testing does show up in Data Flash register dump.And from that... though I have changed ZVCHG, PFIN and SYS_Pres settings don't get desired results even if I set them back to the Mfg's original code.So, probably damaged some chips.Thanks for the input!
Reason for LG-Chem NCM712 E78 Recall by VAG? - Page 1
Forum section: electronics / general

author: Amper
author_rank: Frequent Contributor
timestamp: March 18, 2025, 07:21:02 am
content: Hi!Im working with 12 and 8S Modules manufactured by LG-Chem in 2020 that were subject to the VAG Recall.Sadly there is almost no proper information on why the Packs fail so i wanted to have a listen around here in case someone has more insight.The Modules in Question use LG-Chem NCM712 E78 Cells packaged into 12s2p or 8s3p Blocks. Of the four Modules i own three have obvious issues regarding one Cell (3p or 3p obviously but i cat determine more accurately without dismantling the pack) seemingly having a higher self discharge compared to all other cells.The first Module i got showed a reduction in the self discharge rate after having been balanced for a few months but seems to increase again when the cell voltage increases.Im curious now about the reason and if some sort of runaway condition is likely or if i can just "hold them" at a high voltage using the BMS with no risk. According to Volkswagens diagnostic printout the packs are all "safe" but who knows what the definition of that could be.Here is a diagram showing cell Voltages over the last two days cycling the Pack up and down a bit, a different behavior of Cell 12 is visible. Cell 1 can be ignored, thats a BMS issue.Also an image of the four blocks. This of cause just being a test setup outside to be safe in case it starts a thermal disassembly
Solis Battery Inverter - Issue with spiking data - Page 1
Forum section: electronics / general

author: IanJ
author_rank: Unknown
timestamp: February 19, 2025, 11:27:05 am
content: Problem with my Solis battery inverter data, I get spikes to max/min randomly on most data, but very noticeable on Battery SOC.The Waveshare TCP Server module that converts the Solis inverter modbus port data to TCP is not to blame because I changed it out for a completely different brand and the same spikes occur.The Home Assistant Solis_Modbus integration is not to blame as nobody else seems to complain the same, and I have been talking to the author.So, I am thinking it's the actual Solis data from the inverter port! I guess I could sniff the RS485 port for confirmation.Another clue is that the SolisCloud.com data does not suffer the same major problem, however, even it spikes the data but far, far less (maybe once a day). So, I am thinking Solis know this and in their cloud they are employing anti-spike as a work around......Just a guess!Anyway, I modified the Home Assistant Solis_modbus integration and added in my own anti-spike code.......enabled it just after that last big spike in the pic below.I never like modifying other people's integrations but C'est la vie.I guess that will do until I get to the bottom of the problem!Possibly an EMI issue.......?Ian.For reference my video:https://youtu.be/UQMHjLdQONg

author: fastbike
author_rank: Regular Contributor
timestamp: March 18, 2025, 12:17:57 am
content: Interesting, I've just bought a WaveShare so I can some local control over my Solis S6 hybrid inverter. I'm using openHAB so will need to see what the pathway for integration is with that.
Designing High-Efficiency AC/DC Power Adapters for LED Lighting - Page 1
Forum section: electronics / general

author: support
author_rank: Newbie
timestamp: March 14, 2025, 08:24:04 am
content: **Hi EEV Community!**I’m developing a series of **AC/DC power adapters** for industrial and consumer applications and would appreciate insights from experts here. Our solutions target:- **LED Lighting Systems** (constant current/voltage drivers for high-density LED arrays)- **Medical Devices** (built-in redundant power boards compliant with IEC 60601-1)- **Energy Storage & EVs** (wide-temperature operation for large battery packs/vehicle refrigerators)- **Home Appliances** (low-ripple designs for coffee machines and small appliances)**Key Technical Features:**- Efficiency >93% (LLC topology + GaN FETs)- Ultra-low EMI across full load (CISPR32/EN55032 Class B certified)- Smart thermal management and OVP/OCP protection**Discussion Topics:**1. **Medical Compliance**: How critical is reinforced galvanic isolation in your medical power designs? Do you prioritize redundancy over compact sizing?2. **Automotive Challenges**: What vibration/heat mitigation strategies have worked for you in 12V/24V vehicle environments?3. **Design Trade-offs**: Would you prioritize ultra-low standby power (<75mW) or extended MTBF (>100k hours) for cost-sensitive applications?**Case Example**:We recently delivered a **24V/10A adapter** for a portable dialysis machine. By implementing a dual-feedback loop, output ripple was reduced to **<50mVpp** (see attached waveform snippet).**Open to Collaboration!**If you’ve faced challenges in similar projects (e.g., high-density PCB layout for medical devices, automotive EMC optimization), let’s brainstorm solutions!_*Note: Detailed specs and test reports are available upon request._
Power Integrations Gate Drivers & SiC FETs - Page 1
Forum section: electronics / general

author: H713
author_rank: Regular Contributor
timestamp: February 20, 2025, 04:15:52 pm
content: According to their AN-1601, Power Integrations gate drivers (particularly the 1SC2060P) can be used for driving SiC FETs. Does anyone have experience (good, bad ugly) with using these gate drivers, particularly for driving arrays of SiC FETs? The total gate drive power of the 1SC2060P is particularly interesting to me, as is the 60A gate drive capability.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: February 21, 2025, 01:45:55 pm
content: Quote from: H713 on February 20, 2025, 04:15:52 pmI have not used this but I have designed SiC and IGBT gate drives. This is setup for IGBT's. The off gage bias on SiC is typically -5V. This unit is -10V which would be used on IGBT's.

author: Wolfram
author_rank: Frequent Contributor
timestamp: February 23, 2025, 12:27:09 pm
content: If you have a bit more info on the application it's easier to give good advice.20 W gate drive power brings you into the hundreds of kilowatts at hundreds of kilohertz range when talking about SiC gate drive, is this what you are aiming for? The 60 A number is pretty acacemic, as most SiC devices will be limited by Rgint to a few tens of amps, and if you're talking bricks then they usually have more added gate resistance internally, further limiting the peak current to much less than this unless you're talking multimegawatt operation. 20 W at 20 V gate swing is a whole amp of current, so 20 microcoloumbs at 50 kHz, and a 500 A 1200 V brick is well below a tenth of this.Personally I'd look at rolling your own gate driver, depending on the application requirements. A low isolation capacitance DC/DC for power, an isolated gate drive IC with sufficient isolation and CMTI specifications, and a BJT emitter follower buffer should give you similar performance at a fraction of the cost.