hybridfree/eevblog-posts huggingface dataset:
Looking for high dynamic range fuel gauge - Page 1
Forum section: electronics / projects

author: Waseem
author_rank: Newbie
timestamp: October 09, 2023, 02:44:28 pm
content: Hi,I'm working on a design that uses a beefy 40V LiFePO4 battery pack, and can draw current anywhere from a couple of mA when sleeping all the way to 40A when the load is engaged. I want to use one fuel gauge chip but I'm having trouble selecting the current sense resistor. If I place a 1 mohm resistor for example, I don't get enough voltage drop at low current for most chips that I found that can work at 40V. And if I place a 20 mohm resistor, I get an unacceptable amount of power loss during high current 0.02*40*40 = 32W.I contemplated the use of two fuel gauge chips, one for high current path and one for low current and then do some firmware wizardry to combine the two readings, but I would like to find a more elegant and easier solution if it exists.Any help is appreciated.

author: Terry Bites
author_rank: Super Contributor
timestamp: October 10, 2023, 04:51:23 pm
content: You can still buy an old fossil ic, the LM3915 is adriver for a Logarithmic Dot/Bar Display. Hack a cheap kithttps://www.ebay.co.uk/itm/394643376897

author: Kleinstein
author_rank: Super Contributor
timestamp: October 10, 2023, 06:14:42 pm
content: Using a kind of seprate measurement system for the high current part (e.g. motors) and low power part (e.g. µC and sensors, motor controllers) is likely a way to go. The high current part is likely only using power for some time an no power the rest of the time. To make it work easy with the SW the higher power part should take truely no power when off.

author: wasedadoc
author_rank: Super Contributor
timestamp: October 10, 2023, 06:35:01 pm
content: Quote from: Terry Bites on October 10, 2023, 04:51:23 pm@Terry Bites. Please explain how using an LM3915 addresses the OP's question.

author: uer166
author_rank: Super Contributor
timestamp: October 10, 2023, 06:40:29 pm
content: The more elegant solution would be to ignore the sleep current entirely and reset the fuel gage at known points (say 100% or 0% SoC). This of course wouldn't work well if you have it sleeping for years.A fuel gage/coulomb counter doesn't really tell you how close the pack is to cutoff anyway, the cell voltage does.

author: Someone
author_rank: Super Contributor
timestamp: October 10, 2023, 08:53:06 pm
content: Quote from: uer166 on October 10, 2023, 06:40:29 pmYes, no point trying to measure currents down near the self discharge rate of the cells.
Looking for high side drivers from ST - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 05, 2022, 10:05:14 am
content: I need single and dual high side drivers from ST.Unfortunately they are out of stock "everywhere".I need:* 600 pcs. VN800PSTR-E or VN800PS-E or VN800S* 3600 pcs. VNI2140JSmaller quantities are also helpful.Does anyone have these parts?
Looking for High Speed (1Mbps) RF Tx/Rx modules with Logic Inputs - Page 1
Forum section: electronics / projects

author: TeddyPython
author_rank: Contributor
timestamp: November 03, 2019, 07:16:55 pm
content: Hi, I'm wanting to build a simple wireless data system, to transmit data at least 1Mbps over a 2m distance. However, I would like the module to have a simple Logic input for data, rather than (say) a I2C or UART interface. Something along the lines of the NTX2 (datasheet:http://www.radiometrix.com/files/additional/ntx2nrx2.pdf), but working at a much faster data rate.Is anyone aware of such a transmitter/receiver/transceiver (preferably with dev pcb)? I am not restricted by operating band, I just don't want any data framing or similar - just straight modulation of an input bitstream.EDIT: Changed data rate required.

author: jhpadjustable
author_rank: Frequent Contributor
timestamp: November 03, 2019, 11:13:48 pm
content: What if what you're looking for simply isn't available because it's not commercially viable, not very practical, not especially robust, and is likely to violate unlicensed radio regulations in most of the world? What's your application and why do you want this instead of any of the quite nice and usable smart transceivers such as the nRF24L01+? Or, for that matter, a good fast optoisolator?

author: OwO
author_rank: Super Contributor
timestamp: November 04, 2019, 03:14:42 am
content: Quote from: jhpadjustable on November 03, 2019, 11:13:48 pmThere are no regulations about packet mode vs wire mode other than duty cycle limits on some bands in the EU.The AX5043 is the only single chip transceiver I'm aware of that supports wire mode. It is synchronous (there is a baseband clock signal supplied by the AX5043 that you have to time your data pin to). However this chip only goes up to 100Kb/s.

author: TeddyPython
author_rank: Contributor
timestamp: November 04, 2019, 02:04:05 pm
content: Thanks OwO, I think I will see about building it from an SDR system instead. Appreciate the clarification of terminology with 'wire mode' too.
Looking for Husqwarna Autocheck - Page 1
Forum section: electronics / projects

author: martonmiklos
author_rank: Contributor
timestamp: May 12, 2023, 08:18:19 pm
content: Hi folks,On the analogy of this topic:https://www.eevblog.com/forum/projects/looking-for-robomow-rm-toolkit/I would like to ask around for a copy of the Husqwarna Autocheck tool. I am looking to support older models (Automower 305) so it is likely called Autocheck EXP.I know it is likely needs web authentication, however my goal is to reverse engineer and study it.In theory it could be used to control the rover via USB (for testing purposes) what I would like to reverse engineer and see if it could be wrapped into the OpenMower.Many thanks in advance!
Help, looking for ideas- 8 channel, duplex remote control for remote ATU?? - Page 1
Forum section: electronics / projects

author: Tracker
author_rank: Regular Contributor
timestamp: May 24, 2020, 09:12:37 am
content: Hello folks,Throwing this out there in the hope that someone has suggestions?Looking for clever (yet simple) suggestions to remote control remote device, preferably in full duplex.I operate a remote Antenna Tuner (ATU), model LDG AT-1000.https://ldgelectronics.com/index.php/products/desktop/at-1000proii/It was not designed for remote use, but that's not stopping meCurrently I provide power down the Coaxial line using a Bias-T to provider 12v DC.To trigger the 'Tune' button, I made a time delayed relay which engages the 'Tune button' for 4 seconds after power on, this enables Tune mode, and if no RF is present within a few seconds the ATU simply reverts to its previous settings.This arrangement works, but is very limiting in terms of full operation of the ATU.So I'm on the hunt for a better remote control solution, ideally 8 channels duplex which will allow full control and feedback from the button status led's (I don't need to feed back the LED bargraph).I really don't want to run a multi-core control cable if at all possible.I have considered a form of PWM delivered over the DC voltage line, but since I operate all HF frequencies from 1.6 MHz to 29 MHz at 400 Watts I thought that may be a bad idea and would end up with false triggers.Any suggestions, perhaps off-the-shelf duplex control modules?ThanksRay
Looking for ideas for distributing different DC voltages - Page 1
Forum section: electronics / projects

author: EBRAddict
author_rank: Contributor
timestamp: January 26, 2017, 09:35:34 pm
content: I have a project box I'm putting into my car. My project uses the car voltage 13.8VDC, which feeds a battery backup module, which feeds a switching converter down to 5VDC which then feeds a couple relays controlled by a micro. I need multiple taps off each so there'd by 5 rails including ground. 5A is the current limit on the ground return.Is there some off the shelf part with isolated rails and quick disconnects, or something similar to this?Right now I'm using a piece of FR4 I've roughly routed out and drilled for separate rails. If I can't find anything off the shelf I'll just get a PCB made.

author: EBRAddict
author_rank: Contributor
timestamp: January 27, 2017, 01:11:58 pm
content: Getting somewhere, I found these on Digikey/Mouser:http://www.digikey.com/product-detail/en/keystone-electronics/1008/36-1008-ND/315144

author: Codebird
author_rank: Regular Contributor
timestamp: January 27, 2017, 01:30:52 pm
content: QuoteCar voltage is 13.8V nominal - actual voltage from 9V (When the starter is running) to 25V spikes (Sudden load drop when the alternator is spinning at full speed). Plus noise from the ignition and all the motors. If you're doing an automotive project, make sure your DC-DC converter can handle such an unpredictable input.I suggest you look at car or boat fuse boxes - they not only make good distribution boards, they give you a fuse on every line too.
Looking for ideas for projects using small 3ph motor  - Page 1
Forum section: electronics / projects

author: mike buba
author_rank: Contributor
timestamp: February 24, 2023, 08:58:03 pm
content: Hi All, I happen to have a 3ph 0.75 kW 2-pole motor which in the past I used to test 3ph inverter outputs. Now I have a variable resistive load setup, so I do not need the motor any more.Do you have any ideas for the projects where I could use the motor?The motor's datasheet is in the attachment.Thank you in advance.

author: Benta
author_rank: Super Contributor
timestamp: February 25, 2023, 08:47:46 pm
content: Pretty lil thing and very useful.Drill pressCircular sawBand sawLatheGrinderExtraction fan...I love those motors, they run so smoothly you hardly hear them.

author: jpanhalt
author_rank: Super Contributor
timestamp: February 25, 2023, 08:54:30 pm
content: And, scroll/jig saw. Of course, with a VFD drive.

author: elekorsi
author_rank: Regular Contributor
timestamp: February 26, 2023, 10:50:32 am
content: Quote from: jpanhalt on February 25, 2023, 08:54:30 pmYes, VFD IF he needs adjustable speed, otherwise he can wire it in star and run directly from 3ph grid. No need for VFD if you dont need to adjust the speed
Looking for info about CSR8630 bluetooth module for a project - Page 1
Forum section: electronics / projects

author: Alpejohn
author_rank: Newbie
timestamp: May 22, 2017, 06:42:24 pm
content: Hi,Im working on a bluetooth streaming adapter for my bmw.And i am going to use the CSR8630 chip. So i have bought two of these:http://www.ebay.com/itm/CSR-8630-Bluetooth-4-0-BLE-wireless-Stereo-Audio-Module-Speaker-headphone-/221910406852?hash=item33aae416c4:g:Tw0AAOSw14xWGdaFThe plan is to solder this module to my board. And i need to connect power, audio out and the pins for skipping forward and backwards.But im having some problems connecting it up. Or i dont understand the pin outs..Im assuming the pin 26 GND and 27 VBAT is power. But when i apply power here, and then try to search for it i cant find it.Probably not the best way of telling if it powers on or not though..Also im not sure what pins are for audio out.I have searched alot, but cant find any good info. Also sent a message to the guy on ebay selling them, asking what pins was + and -, audio out and so on.Only answer i got was "plus is +, minus is -". So i gave up asking him more questions.Has anyone here used this module, or know anything about them? I would appreciate it if you could share your info with me.

author: Buriedcode
author_rank: Super Contributor
timestamp: May 24, 2017, 12:41:12 am
content: I have not used that particular module, but a few using the CSR8645.You are correct in that Vbatt is 'power' (often a lipo battery 3.2 - 4.2V) but usually these modules have a 'Vreg_EN' pin which enables the on-board voltage regulators and powers it up.In your case it may will be the MFB pin - multi-function button. When you apply power using Vbatt, and GND, check the '1.8V' pin for.. well 1.8V. Try pulling the MFB pin high by tying it to the Vbatt with a 10k resistor.The IO voltage on these is probably 1.8V so you should use the 1.8V line for your buttons, but Vbatt will do as long as you have series resistors to limit current. And in the case of the MFB it has to be Vbatt anyway as that enables the regulator.Audio out is SPK_LP/SPK_LN for left, and SPK_RP/SPK_RN for right. It has differential output, so a + and - for each speaker, which means you can't just connect the negative outputs to ground. The reason for the differential connection is that there is often a lot of noise coming from the rest of the chip (power management, CPU core, RF parts) which bleeds to the outputs. By using differential connection that noise can be cancelled out, but it does make it more difficult if you want to have an output with a common ground - often requires either an opamp difference amplifier for each output, or a headphone amplifier chip with differential input (PAM8908, MAX9722 etc..).
Looking for info on NEWCON capacitors - Page 1
Forum section: electronics / projects

author: Circuitous
author_rank: Unknown
timestamp: February 04, 2014, 06:17:41 pm
content: A coworker brought over an electronic ballast that had died. It's a Coralife SPL-265R-JS, and the circuit board inside is marked as being made by Skynet Lighting. I've found the site for skynet... not much info.I've found that one of the capacitors is open circuit, and I'd like to get a good replacement. It's marked as NEWCON, but I can't find much in the way of references for that brand. I plan to replace it with a Nichicon or similar quality, but I'm not sure of the rating.The capacitor is fairly small (5.24mm x 11mm, radial) marked as:50V10uF105 CWYDoes the WY just indicate the rated hours?Does anyone have a link to the NEWCON datasheets or ratings?

author: dannyf
author_rank: Super Contributor
timestamp: February 04, 2014, 07:27:26 pm
content: NEWCON = new con.

author: mariush
author_rank: Super Contributor
timestamp: February 04, 2014, 08:02:11 pm
content: It's just a shitty chinese capacitor.Replace with any good quality 10-15uF 50-63v capacitor.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: February 04, 2014, 08:33:54 pm
content: I doubt you`ll find any datasheets or ratings.As mariush said they are just shitty caps, replace with good quality ones .A bit of info about newcon,the company is/has been wound up.As with many bad capacitor makers, they spring up,sell shit,shut down or change the company name.http://www.trade2cn.com/companyShop/214876/aboutUs.html%3Bjsessionid=3078F3EC3D9C8B96B4EE8B55D26688CB?0http://www.companies-hongkong.com/newcon-industrial-limited-dqwc/

author: Circuitous
author_rank: Unknown
timestamp: February 04, 2014, 09:04:32 pm
content: Quote from: fluxcapacitor on February 04, 2014, 08:33:54 pmThat's what I guessed when I couldn't find much in my searches. I found a couple of references to NEWCON on the badcaps forum, definitely not liked over there.I'll pickup some good ones with a decent hours rating to help the ballast last a little longer.Thanks for the feedback!
Looking for large size graphic LCD display recommendation - Page 1
Forum section: electronics / projects

author: aiq25
author_rank: Regular Contributor
timestamp: June 04, 2017, 09:17:53 pm
content: Hello. I'm currently using a ST7920 128X64 graphics LCD with an Arduino Pro Mini. Unfortunately the LCD is not large enough for all the information I would like to display. My option is to use a larger graphics LCD or use two ST7920 modules.I was looking on eBay and found some Ocular FMG24161 OG26161 240X160 modules but it seems like there are no drivers for these guys. I also found the Sparkfun LCD 160x128 module (https://www.sparkfun.com/products/8799).Does anyone have any recommendation for a larger graphics LCD modules but is on the cheaper side? Less than $15 would be nice. If not then I think I will go with two ST7920 modules.

author: Avacee
author_rank: Unknown
timestamp: June 04, 2017, 09:26:32 pm
content: Appreciate you've already got time invested in the existing LCD UI but the cheapest Nextion is 2.4" and 320x240 and they can be picked up off eBay for less than $15.https://nextion.itead.cc/

author: aiq25
author_rank: Regular Contributor
timestamp: June 08, 2017, 09:18:01 pm
content: Quote from: Avacee on June 04, 2017, 09:26:32 pmThanks for the recommendation. I will look into that.

author: ovnr
author_rank: Frequent Contributor
timestamp: June 09, 2017, 12:10:01 am
content: I've generally been happy with the stuff I've bought from BuyDisplay.com. If you want a fairly roomy display, I can recommend the3.4" 240x160 LCD; viewing angles are fairly good for what it is, and it's nottoopainful to drive (it has some slight idiosyncrasies with byte packing).

author: aiq25
author_rank: Regular Contributor
timestamp: June 09, 2017, 02:14:03 am
content: Quote from: ovnr on June 09, 2017, 12:10:01 amThanks. I found that screen but wasn't sure about buying it due to the flex cable (instead of something I can solder onto). Might keep it as an option because I like the color options and contrast.
Looking for Li-ion charger board or chip advice. - Page 1
Forum section: electronics / projects

author: qno
author_rank: Frequent Contributor
timestamp: January 09, 2014, 10:25:50 am
content: Hi all,For a project i need to charge a single cell Li-ion battery. I need 10, 20 maybe 50.It needs to be supplied by the widest range of voltages I can get.Preferably from 5V USB to 14.2 volt car battery voltage.It needs to have the overvoltage protection and charge current limiting.Does anyone know a ready made board? China?I have seen Sparkfun but it does not do 14V.For this project I wanted to use a boost converter but after finding a booster board in China for $1.20 I am using that.I cannot even buy the components @ Farnell if I use 100pcs prices for that amount.So maybe I have not looked hard enough but i hope one of the forum members can point me in the right direction.Thanks

author: sleemanj
author_rank: Super Contributor
timestamp: January 09, 2014, 10:59:16 am
content: The cheap USB powered single cell chargers you can buy all typically use either the the TP4057 or TP4056 controller, and typically just the reference design from the datasheet (such as it is).Some datasheets for the TP4057indicate it has a 15v max input and 1A max charge current, whileothers indicate 9v with 500mA max charge currentThe TP4056 I've only seen referenced as 1A charge current, and 10V max supply.The 1A TP4057 boards I've seen have all used two controllers, indicating that they must be 500mA versions and thus 9v max supply.Unless you can definitely get one of the 15v max input 4057 on one of those boards (I suspect it doesn't exist), then you will have to introduce a buck converter, or SEPIC (boost-buck), the cheap chinese ones would do the job (LM2596 ones are for bucking only, LM2577 ones with two inductors are buck-boost) but if running in an automotive situation then you might have to add some extra protection, at least a bidirectional TVS diode across the inputs.

author: amyk
author_rank: Super Contributor
timestamp: January 09, 2014, 12:42:48 pm
content: Are you sure you mean aboostconverter? A single lion cell is 4.2V maximum and if you range is 5-14V you will be looking at buck converters and maybe linear regulator types. Here are two that might suit your application...MC34673, up to 28VLT3650-4.X, up to 32V

author: peter.mitchell
author_rank: Super Contributor
timestamp: January 09, 2014, 02:28:04 pm
content: Linear charge controller with a buck converter powering it seems about right...

author: qno
author_rank: Frequent Contributor
timestamp: January 11, 2014, 09:52:08 pm
content: Hi all,Thanks for the replies.Ill order some buck boards but they take 6 weeks to arrive from china.I will update the post by then.
Looking for li-ion charger ic with over discharge protection - Page 1
Forum section: electronics / projects

author: Tada9
author_rank: Newbie
timestamp: April 27, 2019, 01:13:20 am
content: Hi guys,I am looking for single cell li-ion charger ic with over discharge protection for my project. I would like to avoid using 2 separate ICs for this.I was able to find some ICs that have both functions(for example STNS01), but they are way too expensive and have many features that I don't need. I really only care for the charging and protection. Ideally, the cost shouldn't exceed ~1USD.Any ideas?

author: Peabody
author_rank: Super Contributor
timestamp: April 27, 2019, 02:15:48 pm
content: You might look at the LTC4054. It may be over your budget, but I think it provides charging and over-discharge protection.

author: OM222O
author_rank: Frequent Contributor
timestamp: April 27, 2019, 02:39:59 pm
content: you might want to look at the chinese go to chip: DW01here is a link to the datasheet:https://cdn.sparkfun.com/assets/learn_tutorials/2/5/1/DW01-P_DataSheet_V10.pdfyou just need to add an additional duel fet in order to allow the IC to disconnect the battery in fault conditions.Edit: you can buy 20 of them for 1$ on aliexpress:https://www.aliexpress.com/item/FS8205S-DW01-8205A-SOT23-6-lithium-battery-protection-IC-chip-DW01A-FS8205S-8205S/32881501475.html

author: Tada9
author_rank: Newbie
timestamp: April 27, 2019, 07:29:00 pm
content: Unfortunately, LTC4054 is only a charger and DW01 is only a protection circuit. I am looking for combination of both to save on part count, space and complexity.

author: OM222O
author_rank: Frequent Contributor
timestamp: April 27, 2019, 07:40:16 pm
content: did you look at the data sheet for the DW01?It both provides charging cut off (4.25V) and all sorts of protection ... you seriously can't get much better than that. there's a reason all chinese products use it.
Looking for LiFePO4 protection IC - Page 1
Forum section: electronics / projects

author: EVfreak
author_rank: Newbie
timestamp: July 13, 2018, 03:38:21 pm
content: Hello Everyone,I'm working on a LiFePO4 protection circuit module(PCM) project like the ones on ebay:https://www.ebay.com/itm/2A-3-2V-3-6V-1S-LiFe-Lithium-LiFePO4-18650-Battery-PCB-Protection-Circuit-board-/191903228801I couldn't find the protection IC (It's exactly like DW-01 but for thresholds pre-programmed for LiFePO4 cells). There are some ICs mentioned in a previous post:https://www.eevblog.com/forum/projects/looking-for-a-lifepo4-overundervoltage-overcurrent-protection-chip-or-circuit/msg1076433/#msg1076433The ones mentioned in the post are extremely hard to source, and proved to be a dead end. I managed to zoom on the ICs used in the ebay product, but couldn't find any more leads. Can someone suggest some ICs or help me find the Company which made the ICs used in the ebay product? I'm attaching the zoomed in picture of the IC used in the ebay product.Thanks in Advance!

author: Hixfield
author_rank: Contributor
timestamp: November 28, 2020, 11:41:32 am
content: Did you eventually find a chip that worked?

author: Boscoe
author_rank: Frequent Contributor
timestamp: November 28, 2020, 11:06:28 pm
content: I have implemented a protection circuit with TI's current sense IC INA300 and voltage monitor TPS3700. I, too, found it difficult to find a solution. I might post mine as a reference.

author: miceuz
author_rank: Frequent Contributor
timestamp: December 02, 2020, 09:47:18 pm
content: I also once needed a protection for LiFePo4 and ended up implementing it using TPS3700 comparator and DMN2019 mosfet.

author: Jonodug
author_rank: Newbie
timestamp: June 29, 2021, 10:33:42 am
content: Hi ThereI see that not much else has been said on this, but came across this post while trying to implement protection.I would guess that those of you that have already comment have solved in other ways but those to Come here still this is what I have recently found and have done.Waiting on PCB still so not tested but found this solution.CN3058E- charger chipHY2112-AB- Protection ICThe datasheets are in Chinese but with a bit of translating and the similarity to the tp4056. I worked most Out.I also later found this on banggood3.2V 3.6V 1A LiFePO4 Battery Charger Module Battery Dedicated Charging Board
Looking for Linear Motor Assistance. - Page 1
Forum section: electronics / projects

author: Swobethy
author_rank: Newbie
timestamp: August 21, 2024, 12:05:02 am
content: Hi All,I'm currently attempting to create a linear motor (Photo attached). I've run into a few problems and I'm looking for anyone with any experience or knowledge I could help.I've created a section for the linear motor with 24 Gauge wire with 40 wire turns to create the electrical field and once using it with my variable power supply I'm only getting input from amps. I was just Wondering if anyone knew a way to make an open circuit to have the variable input from the volts. I'm working with a 30v 10amp variable power supply and looking to move a small sheet of 2mm aluminium at 100 watts.Open to questions and any help will be much appreciated. Cheers

author: Doctorandus_P
author_rank: Super Contributor
timestamp: August 21, 2024, 12:25:45 pm
content: Electric motors usually work with permanent magnets. This lets you make use of the magnetic field of the coils directly.But I also saw the video below:This setup is remarkably similar to yours. In the Aluminum plate you can generate eddy currents, which create a magnetic field of their own, and this can indeed be used to move the plate, but the interactions is much weaker. You also need a constantly changing field in the coils, or else no eddy currents get generated, and the aluminum plate will just sit there.I find the use of an frequency inverter to drive an electric motor a quite ingenious idea, But also, these frequency inverters are designed to drive motors, so it's a logical choice too. These inverters output a low (average) voltage for low frequencies, and they have quite a lot of parameters you can adjust to tune them to the actual motor used. I'd say go buy one. These things only cost around EUR100.While experimenting, do keep some safety in mind. With a frequency inverter all the coils get connected to high mains voltages, and the edge of such an aluminum plate can easily damage the thin insulation coating of the wires. That video is not a safe setup.

author: Swobethy
author_rank: Newbie
timestamp: August 22, 2024, 03:01:02 am
content: Thanks for the response,The video you have linked is what I first saw and am attempting to recreate.Would you know where to find a frequency inverter or have any recommendations?Thanks
Looking for LP IoT module for Smart Home - Page 1
Forum section: electronics / projects

author: Tomsik
author_rank: Contributor
timestamp: February 03, 2020, 09:34:01 am
content: Hello, I look for IoT module for my smart home project.Requirements to the module are:-distance rangeapprox. 150m max. (free space) but it must work reliably in space between three floors in a house and from house to garden (mentioned 150m).-network structureI intend 5-10 nodes that communicate in a way "there and back" with a gateway. Point to point in a star topology. In one time communicates only one node. Mesh isn't required.-Consumption5-10uA in sleep or standby mode, max tens of mA in Tx or Rx mode. Minimum radio time. The node should work 1 year on 2 x 18650 battery cells.-Easy to useUSART with AT is prefered but could be SPI or I2C. Condition is easy and reliable drivers from the producer.-Costmaximum 15 euro for one piece of the module-Datanode will transmit just a few bytes, the maximum number of bytes is 50.I think ESP is overkill and has big consumption. Maybe something in band 433 or 868MHz.Thank you for suggestions of a particular module.
Looking for LSI 27756 Data Sheet - Page 1
Forum section: electronics / projects

author: bilko
author_rank: Frequent Contributor
timestamp: March 10, 2012, 02:21:28 pm
content: I'm looking for a data sheet for a 27756C chip manufactured by LSI. I've searched google but can't find anything. Any ideas please ?

author: amyk
author_rank: Super Contributor
timestamp: March 11, 2012, 12:14:18 pm
content: What's it used for/where did you get it from? Are you sure it's not just an alternately marked 27C256?

author: bilko
author_rank: Frequent Contributor
timestamp: March 11, 2012, 12:24:08 pm
content: Its a clock divider chip, 8 pin dip. It is used to pulse an hour meter counter. One pulse every 3.6 seconds or 1000 pulses per hour. Its nice and compact, a single 8 pin DIP and a watch crystal is all that it needs. Now looking for a functional replacement. May use a PIC but pinout is slightly different.
Looking for Marcosilicon MS2109 Datasheet/Reference Schematic - Page 1
Forum section: electronics / projects

author: somuchtyler
author_rank: Contributor
timestamp: December 31, 2020, 08:20:27 pm
content: Hey guys, does anyone have a reference schematic or datasheet for the Marcosilicon MS2109? It's a 7x7mm QFN-48

author: PRSXFENG
author_rank: Newbie
timestamp: July 22, 2021, 02:00:47 am
content: There's not much info out there other than thishttp://en.macrosilicon.com/info.asp?base_id=2&third_id=50But reading a Youtube comment somewhere, it does the followingMJPEG format, 1080p30/720p60does 96kHz mono due to a bug, was supposed to do 48kHz stereoalso heatsink it, it will toast itself without one
Looking for MCU with both USB and Wi-Fi - recommendations? - Page 1
Forum section: electronics / projects

author: cmumford
author_rank: Contributor
timestamp: December 06, 2020, 12:11:26 am
content: I'm trying to make a USB HID device (keyboard) that also has Wi-Fi support. So far, the only MCU that I can find with support for USB+Wi-Fi is the ESP32-S2. Unfortunately ESP-IDF doesn't yet have HID support - only CDC. I'm not super USB literate, so I'm probably overlooking a good solution. Any advice would be appreciated. Thx.

author: robzy
author_rank: Regular Contributor
timestamp: December 06, 2020, 02:10:57 am
content: Food for thought:-https://github.com/cnlohr/espusbI found this while Googling "ESP32 USB HID". Just because ESP-IDF doesn't have USB HID doesn't mean that the ESP32 can't do it.You might find that using two seperate micros, e.g. ESP32 for Wi-Fi and something else for USB HID, is the easiest way to go.

author: cmumford
author_rank: Contributor
timestamp: December 06, 2020, 04:43:51 am
content: I also thought about something like theMAX3420E.

author: EverydayMuffin
author_rank: Regular Contributor
timestamp: December 06, 2020, 12:30:27 pm
content: Have a look at these:Azurewave AW-CU427-Pwhich is based on Cypress PSoC 6 (Arm Cortex-M4) + CYW4343 Radio.Murata Type 1GCwhich is based on Cypress CYW43907.

author: Boscoe
author_rank: Frequent Contributor
timestamp: December 06, 2020, 10:19:18 pm
content: What about an ESP32 and a an FT260? Very simple...https://www.ftdichip.com/Products/ICs/FT260.html
Solved, obsolete. - Page 1
Forum section: electronics / projects

author: evb149
author_rank: Regular Contributor
timestamp: November 18, 2014, 04:29:26 am
content: Solved, obsolete.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 18, 2014, 05:57:07 am
content: If it's any help, the handbook (VCO/HB-01) just seems to be a reprint of most of the VCO tech noteshttp://www.minicircuits.com/applications/applications_notes.htmlThey're not layed out the same but it's the same content AFAICT.The rest of the handbook is datasheets.
Looking for Mobitex Interface Specification (protocol spec) - Page 1
Forum section: electronics / projects

author: philpem
author_rank: Frequent Contributor
timestamp: September 01, 2018, 06:12:03 pm
content: Hi there,I've been trying to get my mitts on a copy of the Mobitex Interface Specification (either the Ericsson / Televerket / RAM / Cantel version from the 80s/90s or the later Mobitex Association "MIS" CD).I've tried ordering it, but the order form is broken and I've had no response from any of the email addresses on Mobitex AB's website.If anyone happens to have a copy of either the paper Mobitex specification or the "HTML CD" version -- I'd be very interested in a copy!Note that there's an "Open" version of the standard which covers the network stack but not the physical radio layer (ROSI) -- it's the ROSI information which I need.Thanks,Phil.
Looking for modern low quiescent current LM324 and 78L05 devices - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 13, 2021, 03:34:49 pm
content: What devices are used nowadays as substitutes for the legacy parts in the subject line.I’m looking for the same high voltage performance but an order of magnitude lower, or better, quiescent current.Most new parts seem to be designed for lower voltages.Are modern variants of the old legacy parts available?Which ones are commonly used?

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 13, 2021, 04:31:38 pm
content: At +/-15v supply, worst case Iq for the ADA4096-4 is 100 uA per amp, whereas the LM324 is quoted at 3 mA per amp.You will have to download the data sheet and go one by one for all the parameters to determine whether the ADA4096-4 is suitable for your requirements.Also the performance is not cheap, expect to pay 10 or 20 times more.

author: Syntax Error
author_rank: Frequent Contributor
timestamp: April 13, 2021, 04:40:23 pm
content: For the 78L05, I've used the Texas LP2950ACZ-5.0

author: Kleinstein
author_rank: Super Contributor
timestamp: April 13, 2021, 07:01:03 pm
content: For the LM324 there is the MC33174 as a slight upgrade at not too much higher cost. The performance is slightly better (higher speed).A bit different technology, but lower current (110 µA / amp) would be the OPA4170 probably also available in a cheaper TLV.... version.AFAIK the 3 mA max for the LM324 are for the whole chip, not per amplifier.Otherwise high voltage parts are not popular anymore. There are more options at lower (e.g. 5-12 V) supply.

author: strawberry
author_rank: Super Contributor
timestamp: April 13, 2021, 08:19:59 pm
content: LP324 85uA(per IC) 32V
Looking for module to measure mains RMS AC voltage from a microcontroller - Page 1
Forum section: electronics / projects

author: torriem
author_rank: Newbie
timestamp: November 02, 2021, 07:51:31 pm
content: I'd like to be able to monitor mains AC voltage from a microcontroller in an industrial setting.I've done a lot of searching but I usually just find people discussing various circuits for doing this, which I'd rather not get into at this time. What I'm looking for is some commercial (but hopefully not ridiculously expensive) module I could buy that takes AC voltage in and spits out some analog DC voltage signal proportional to the RMS voltage of the AC input. Basically analogous to a multimeter. I don't require a great very much precision, maybe the nearest 10v.I know there is a ZMPT101B module, but that is just giving me the complete wave form which I'm not interested in, although if that was the only thing available it could work. I just want something that outputs 0-5vdc that's proportional to say 0-130 VAC.Do such parts exist? Surely in the industrial world this is common. I realize industrial parts are expensive but maybe something could be found for under $100 USD.Alternatively some self-contained device that can digitally measure the voltage and transmit it via over some wire protocol like I2C, SPI, etc would work.

author: balage
author_rank: Regular Contributor
timestamp: November 02, 2021, 08:05:45 pm
content: I used the CS5463 metering IC to measure current but it can measure voltage as well. It has an SPI interface and if you use resistive divider for the mains voltage than you'll have to isolate the circuit somewhere. It costs around 4 bucks.https://www.versasense.com/files/datasheets/CS5463_F3.pdf

author: torriem
author_rank: Newbie
timestamp: November 03, 2021, 12:12:51 am
content: Very many thanks! That gives me something to search for. That chip is just about ideal for my purposes. I see there a number of companies selling little modules based on that chip that would work for testing purposes.

author: ledtester
author_rank: Super Contributor
timestamp: November 03, 2021, 04:04:38 am
content: For ready to use modules, I found these on aliexpress which have RS485 interfaces:- PZEM-004T e.g.https://www.aliexpress.com/item/32988871486.html- PZEM-016 e.g.https://www.aliexpress.com/item/32912734749.html- SDM120-MODBUS e.g.https://www.aliexpress.com/item/32503313371.html- KWS-AC301 e.g.https://www.aliexpress.com/item/1005003313976851.htmlDetailed video on the PZEM-004T module:Modifying the Peacefair PZEM-004T AC Comms Module (with schematic) -- TheHWCavehttps://youtu.be/qRsjsenvlJA
Looking for module with speaker, microphone, and volume control - Page 1
Forum section: electronics / projects

author: dontknwmucboutanythng
author_rank: Newbie
timestamp: May 19, 2022, 08:13:05 pm
content: I am looking for a module (5 or 12 v dc) that has miniature directional microphone, speaker, and volume control. Primary usage is for voice where the microphone and speaker are about 1-2 feet from the user.Thank you for your suggestion.

author: tepalia02
author_rank: Regular Contributor
timestamp: May 21, 2022, 03:14:02 am
content: You may try something like this
Looking for Nano 3.0 PCB Layout to modify and/or integrate (not footprint) - Page 1
Forum section: electronics / projects

author: EEVPiobee
author_rank: Contributor
timestamp: September 05, 2023, 06:08:12 am
content: Hello!Title is self explanatory... I'm looking for someone willing to provide a Nano 3 pcb layout (free of copyright), and not just the footprint (already have that)Simply put, it's to integrate into my project's board layout.In more details: I'm trying to convert an old "Through hole" arduino based project I've made to an "All SMD" design. I'd like to eventually produce a larger volume and streamline as much as I can so when I send the order to the manufacture, it's all going to be automated instead of sweating the assembly.So, instead of having to buy Nanos separately and have them mounted -after- the main board is assembled at the factory, I could then just start a "fresh CAD"** with a nano as a layout and rebuild my project around it instead, with a possible de-cluttering of what I won't need (i.e. no usb port required for example, no ch340, only icsp).**(well the mistakes already covered and debuged with previous design versions)Additionnaly, I'd like to keep the arduino's footprint as-is so my testing equipment would still work without much modicication.So far, no luck searching by myself.I currently use EagleCAD, but Kicad works...Thank you!

author: Fire Doger
author_rank: Regular Contributor
timestamp: September 05, 2023, 06:42:12 am
content: Arduino's schematics and pcbs are open sourcehttps://content.arduino.cc/assets/Nano-reference.zip
Looking for New Products - Page 1
Forum section: electronics / projects

author: EDAC Electronics
author_rank: Newbie
timestamp: August 03, 2016, 10:38:08 pm
content: My name is Mark Barrie. I am the Managing Director of EDAC Electronics Australasia.For 26 years plus we have been marketing remote monitoring, control and alarming equipment in Australia and New Zealand.Our website iswww.edac.com.auif you would like to have a look.I am currently looking for new product to bring to our market.I look forward to hearing from anyone with a new product they would like help taking it to the market.

author: EEVblog
author_rank: Unknown
timestamp: August 03, 2016, 11:41:33 pm
content: Mark, you can't just post the same thing in multiple sections of the forum, so I have removed the other posts.Asking for projects is fine of course provided you stick around the forum and contribute.

author: batteksystem
author_rank: Regular Contributor
timestamp: August 04, 2016, 02:41:34 am
content: Quote from: EDAC Electronics on August 03, 2016, 10:38:08 pmWhat are your requirement for new product anyway?

author: ataradov
author_rank: Super Contributor
timestamp: August 09, 2016, 08:05:51 pm
content: They started spamming again, so they just look like typical spammers, nothing more.Except in today's spam they make an effort to be spammers:Quote

author: EEVblog
author_rank: Unknown
timestamp: August 10, 2016, 12:47:07 am
content: Quote from: ataradov on August 09, 2016, 08:05:51 pmYep, now banned.
Looking for obsolete Tundra CA20C03B-10 datasheet - Page 1
Forum section: electronics / projects

author: bmihulka
author_rank: Newbie
timestamp: June 06, 2018, 03:21:06 am
content: I'm looking for a datasheet for a Tundra part CA20C03B-10I believe it is a DES encryption chip.I have not been able to find anything with Google.I'm pretty sure this is a very specialized chip and appreciate any info others have.Brian
looking for part equivalent to Winsemi WS9420 - Page 1
Forum section: electronics / projects

author: vinicius.jlantunes
author_rank: Regular Contributor
timestamp: February 16, 2018, 10:05:14 pm
content: I really liked a constant current LED driver I found in a cheap(ish) lamp the other day (see here:https://www.eevblog.com/forum/projects/component-identification-(led-driver)/msg1).I can't find a place to buy it though (at least not the usual suspects such as ebay, aliexpress, banggod).I also don't seem to find similar parts from the name brands (TI, etc.) for directly driving an LED from mains as the referred part does (w/o transformer or anything).I intend to use it for custom light fixtures for my bench so I don't care it's not isolated and maybe not the safest thing out there.Any suggestions?

author: HSPalm
author_rank: Regular Contributor
timestamp: February 17, 2018, 09:16:35 am
content: Found these:http://www.maxictech.com/plus/view.php?arcID=885605http://www.maxictech.com/plus/view.php?arcID=885606http://www.maxictech.com/plus/view.php?arcID=885607Haven't tried buying them though.

author: vinicius.jlantunes
author_rank: Regular Contributor
timestamp: February 18, 2018, 01:17:06 am
content: Thanks HSPalm!Unfortunately not having better luck with finding these...Interesting how none of the brand names seem to have any products for this application (direct mains LED driver, non-isolated). They focus on the more sophisticated I guess...I had found something kinda similar from TI but still a lot more components required.
Looking for PCB connectors that will do -45/+125C and ARE available - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: May 16, 2014, 07:49:55 am
content: Having spoken to a disgruntled TE customer services adviser some time ago I settled on their ampmodu board to wire connection system (ampmodu IV and V to be exact). Got some 3 pin parts and am happy with them.Now i want 6+ pins and guess what, they are like rocking horse shit. I['m really at the end of my tether with TE, they have stuff that is great if only you could get it and their tooling is astronomically priced due to internal politics of how they split the various manufacturing up into divisions. They are also a nightmare to deal with on the whole as now that they are a huge conglomerate who have bought up no only other manufacturers but their distributors you just get passed from department to department and no one really wants to help or can help.So I'm practically back to square one, needing a range of PCB connectors that will do -46/+125C with a 2.54-3mm pitch spacing and that I can actually buy.Any ideas ?

author: KJDS
author_rank: Super Contributor
timestamp: May 16, 2014, 08:20:32 am
content: Talk to these guyshttp://www.ittcannon.com/

author: Simon
author_rank: Unknown
timestamp: May 16, 2014, 09:28:03 am
content: Well i've emailed them but looking at their range they don't do anything for PCB's or anything that small really.

author: KJDS
author_rank: Super Contributor
timestamp: May 16, 2014, 11:23:23 am
content: The only other company I've used a lot is Samtec, but can't remember how they were with temperature.

author: mariush
author_rank: Super Contributor
timestamp: May 16, 2014, 11:48:31 am
content: FCI DuBox used to be 125c rated... at least the datasheets hint to that, but Farnell for example has only the low temperature blue ones (-40c -- 105c). The gray ones were supposed to be high temperature (125c). Click on the technical datasheet and see:http://uk.farnell.com/fci/71991-305lf/socket-2row-5way/dp/1097988They say the same for their 2.00 mm minikek series on the main page here:http://www.fci.com/en/products/input-output-connectors/200-mm-wire-to-board-io/mintek-crimp.html, but all the part numbers say operating range only up to 105c.Maybe give one of FCI's agents a message and ask.

author: Simon
author_rank: Unknown
timestamp: May 16, 2014, 12:29:31 pm
content: hm well I can live with +105C it's the -46C that is the problem although -40C is acceptable
Looking for PCB manufacturer for bga board - Page 1
Forum section: electronics / projects

author: AronF
author_rank: Newbie
timestamp: September 06, 2015, 03:37:24 pm
content: Hello everyone!Fist of all, I'm Fehér Áron, and just recently joined the EEVblog forum (although I was lurking in the shadows on the YouTube channel for ages). I've just finished university (automatics and applied informatics) and started the master study program ( advanced control theory and embedded systems). I'm looking forward to talking to you all.Now for the topic. I want to design a development board with Texas Instruments OMAPL138L (NFBGA361), optionally Xilinx Artix7 FPGA, LPDDR, and Flash memory on a 4 cm x 4 cm (max) 4 layered board with micro board to board connectors. So far I was using Smart Prototyping PCB for board manufacturing which was enough for LQFP144 C5000 ICs but 6mil traces with 6 mil clearance will hardly be enough for BGA IC.I would be really great if someone could help me out with (preferably Chinese) PCB manufacturers. And before someone suggests some devboards ready to buy, I know there are some like MittyDSP, but I would like to design it myself for the fun/learning.Thanks in advance!

author: Berni
author_rank: Super Contributor
timestamp: September 06, 2015, 04:59:26 pm
content: Actually had a OMAP L138 populated on a board too. It was done by Gold Phoenix PCB, but they might be costly for one offs.

author: free_electron
author_rank: Super Contributor
timestamp: September 06, 2015, 06:12:00 pm
content: try morepcb.com

author: AronF
author_rank: Newbie
timestamp: September 07, 2015, 09:05:56 am
content: morepcb.com seems nice. I will start to design the board with their specs, and see where it goes.Thanks a lot!

author: Caronline
author_rank: Newbie
timestamp: September 21, 2015, 08:40:57 am
content: Sometimes I made PCB prototypes from Shenzhen King Sun PCB factory, the quality is ok, you can send email to ask sandy@kingsunpcb.com

author: mrpackethead
author_rank: Super Contributor
timestamp: September 21, 2015, 10:04:43 am
content: Sitopway is pretty good. sales@sitopway.com they guys name is kevin.

author: tggzzz
author_rank: Super Contributor
timestamp: September 21, 2015, 10:14:01 am
content: Quote from: AronF on September 06, 2015, 03:37:24 pmDoes that comply with the FPGA manufacturer's PCB layout recommendations? If not then you are unlikely to create a reliable board.