hybridfree/eevblog-posts huggingface dataset:
Help with Bluetooth Low Energy development - Page 1
Forum section: electronics / projects

author: Gurpreet
author_rank: Contributor
timestamp: May 26, 2019, 07:28:55 pm
content: Hey everyone,I am working on a smart watch project. Its just way of learning embedded software development. Basically its an STM32F072 processor with a 12378-03_T1-ND(digikey P/N) display and an MPU9250 9 DOF sensors as I had an evaluation board lying around. I was thinking of including wireless connectivity through a BLE module so that I could use it to sync time with my PC and transfer 9 DOF sensor data directly to PC. I have selected RN4871-I/RM130-ND(digikey P/N) module for BLE from microchip. I chose it because it is one of the smallest and cheaper BLE modules with a shield on it and it would be easy to solder.The problem I am having with is the software development on my PC side. According to the research i have done so far, there aren't many Python libraries which could implement BLE stack on Windows. Only library I could find is Pybluez(with an experimental BLE support). I don't wanted to plow myself in the Windows application development and learn C++ or C#(ugh). All I want is a simple python library which supports windows and let me transfer few bytes from PC to the watch ans vice-versa easily without much investment of time.Has anyone dealt with BLE before? Please shed some light.Thank you

author: devan
author_rank: Contributor
timestamp: May 30, 2019, 03:55:12 pm
content: I feel your pain - a lot of Python BLE libraries are either wrappers around bluez or are specific to a single BLE dongle.I very briefly evaluated thebleaklibrary. The scanning API was somewhat limited, but it did seem to basically function with my existing CSR bluetooth dongle on Windows 10, so that already puts ahead of the crowd. I did not end up porting my code over from bluepy (Linux only) for business reasons, but it seems very promising for cross-platform BLE support.As an alternative, you might give theWebBluetooth APIfor browsers (well, okay, just Chrome) a shot. It might seem silly to need a local webserver to host the code to interact with your BLE device, but it will run on almost any platform that has Chrome (Windows 10, Linux, macOS, Android) and it's easy to add forms and UI elements with a little HTML.

author: Benta
author_rank: Super Contributor
timestamp: May 30, 2019, 06:57:58 pm
content: A big problem with network connectivity (Ethernet, WLAN, BT, BLE, you name it) is that they're all infested with patents, copyrights etc.Not being a member of the club, meaning spending thousands of dollars, you'll not get the documentation and permission to use the technology.The only way I've found around that is buying modules with built-in stack (=more expensive) and using something like SPP (serial port profile) for interfacing.Let us know how you fare, it really is an issue for all.
Help with chip identification AD80414 - Page 1
Forum section: electronics / projects

author: _pavel_
author_rank: Newbie
timestamp: March 14, 2025, 10:08:04 pm
content: I am looking any information about the AD80414 chip.It is claimed that this is an analogue of AD9371I discovered this chip on the board from Aliexpresshttps://www.aliexpress.com/item/1005008285646908.htmlAt first glance it works like AD9371 (except the deviceid data)

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: March 16, 2025, 08:16:35 am
content: This one?https://www.analog.com/media/en/technical-documentation/data-sheets/ad8041.pdf

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: March 16, 2025, 08:39:46 am
content: An eBay listing says its some sort of RF transreceiver. I'd believe it, considering the length matched, curved traces, inductors, balun, and U.FL connector in your picture. I couldn't find a datasheet anywhere thoughhttps://www.ebay.com/itm/204891584702Quote from: ahsrabrifat on March 16, 2025, 08:16:35 amWay off, its a different package entirely.
Help with component choice for weather proof sensor node. - Page 1
Forum section: electronics / projects

author: MarkusAnd
author_rank: Contributor
timestamp: October 28, 2022, 08:44:51 pm
content: I'm planning on making a wireless weather station with a sensor node and a master to display the sensor data. The sensor node would be placed outside and measure temperature, humidity, and air pressure. As I'm living in Finland, the weather can vary quite much with temperatures between +30 to -30 °C and humidity up to 100%. This brings some challenges to the design and component choices.The temperature sensor and the pressure sensor can both be placed inside a water-proof enclosure without it affecting the measured values. The humidity sensor would need to be placed outside of the water-proof part of the enclosure, ensuring correct measurements. Therefore, I'm wondering how weather-proof humidity sensors like theHS3004are? The datasheets often recommend using the sensor in some temperature range that is above 0°C. Where can I look for components which can handle this environment? Is there some standard I should look for?Thanks,Markus
Help with connection to the mlx90620 to arduino - Page 1
Forum section: electronics / projects

author: kuhny1
author_rank: Newbie
timestamp: February 27, 2015, 05:09:21 pm
content: Hey guys I new to the forum and you can probably tell by the subject that I need help connecting up to the 16x4 thermopile array from melexis. So far I have tried using code from the arduino forum but the library they use in the code is no longer up to date as well as the code it self. I have found the device on the i2c bus with a "i2c scanner" so it was connected properly and it was communicating. But I have yet to get any useful information from it. My plan is to use it with a very low res thermal imaging camera. I want to use it the arduino to send the individual themperatures of all the pixels to my computer then use processing to display the temperatures as different colors. The processing program shouldn't be a problem for me, just getting the data is a headache.The sensors datasheet is VERY vague, even with the supply voltages. The link for it is below. I have tried using the wire library but I have not gotten any results from it. Granted this the first time I used i2c, so probably not the best thing to start out with. So anyway, any help will be appreciated.Thanks,Kuhny1https://www.google.com/url?sa=t&source=web&rct=j&ei=K5HwVJrYJNeqyASA44H4Bw&url=http://www.melexis.com/Asset/Datasheet-IR-thermometer-16X4-sensor-array-MLX90620-DownloadLink-6099.aspx&ved=0CB4QFjAB&usg=AFQjCNHa6B7kTuIY5IVy3kuDxXG6QQtW_Q&sig2=_Y8SAYllz9hTyp8YhjmSng
help with connector identification - Page 1
Forum section: electronics / projects

author: bdeianov
author_rank: Contributor
timestamp: July 31, 2019, 08:50:50 pm
content: Hi,Trying to identify a connector used for a brushless DC motor (see photos).- 6 position, single row (the female housing looks like double row, but isn't)- Pitch appears to be 3.1-3.2mm- Unusually, the latch is between the pins (taking up one pin position) instead of on top.Any ideas? Looked on molex.com and digikey/mouser but so far no luck spotting it.Thanks,Borislav
Help with custom SAMD21 Board - Page 1
Forum section: electronics / projects

author: hytralium
author_rank: Newbie
timestamp: August 30, 2023, 12:07:39 pm
content: Hi,I have recently designed a custom SAMD21 Board, wich I am going to get preassembled, for a total of 5 boards for ~$100.Since this is my first custom Arduino board it would be nice if anyone could look over the schematic and point out any wiring errors.The whole thing meant to be a flight computer for a model rocket, so there is also a barometer, IMU and so-called "Pyro Channels".This is a lot of money for me so if someone could help me, it would mean a lot to me. Thanks!hytraliumBTW: I asked this question on the Arduino Discord Server and I was told to come here, so i hope this is the right place!

author: CountChocula
author_rank: Unknown
timestamp: August 30, 2023, 03:10:50 pm
content: Howdy! Some semi-random feedback:It's a bit hard to follow the schematic—that's neither here nor there, of course, but there areplenty of resourcesif you want to learn how make your schematics more readable (which, in turns, makes it easier for others to give you their feedback).In the power section, R19 may have to be pretty beefy depending on how much current your circuit draws. 12W will go through it for every amp of current, so keep that in mind. (Perhaps consider using a fuse instead?).You should probably have an input cap on IC2, say 10µF ceramic. I would also bump C8 to 10µF.You're cascading U2 and IC2; probably OK, but do keep in mind that that's going to put additional stress on IC2—make sure that the total current draw is within spec.V_USB isn't going anywhere. If you're not using it, just add a no-connect to the USB input.You have multiple pull-up resistors on your SCL and SDA lines; this is redundant—once R1 and R2 pull the lines up to 3V3, you don't really need R3, R4, R5, and R7.There are no resistors on the green and blue lines of D1… are you sure that this is correct? I don't know the MPU very well, so perhaps it can sink the appropriate amount of current, but if not you may be overloading those pins.It's unclear how the pyro controls are meant to work; the PYx-CONT lines don't connect to anything. However, when you pull the PYROx lines up to 3V3, the PYROx-OUT lines are going to be shorted to ground. Make sure that that's okay (i.e.: not drawing too much current, etc.). Also, R10, R6, and R15 are pull-down resistors… why are they so low? As it is, they're going to draw nearly 10mA from the MPU's outputs when those go high).I'm not sure that your ICs are bypassed correctly. For example, I think there should be a 100nF cap between pin 13 of U3 and ground. It may be worth giving this a once-over.I hope this helps. Cheers!—CC
help with Datanetics keyboard - Page 1
Forum section: electronics / projects

author: Didgitalpunk
author_rank: Contributor
timestamp: December 01, 2022, 11:59:39 am
content: Hi,I have an old datanetics keyboard.... board... that I want to reuse for a potential future project, I've drawn out the schematic, and I've hit a snag: I have no idea how to read the lines/columns from the key presses.first things first, yes the keyboard works. I've got 6 unresponsive key-switches, but they're not on the same lines/columns, so it's clearly a dead key problem, and they failed open, meaning pressing them doesn't close the contact anymore. so no biggie for now.No, it's not an apple1 or apple2 board, I have no precise answer as to what it came from, my best guess is an accounting machine, there's a separate keypad with 00 on one of the keycaps. pictures here ->https://twitter.com/Didgitalpunk/status/1594605328615751680.The problem I'm running into is that both the lines and columns are hooked to VCC with a 15k resistor per line/col. and that's it.... so without any extra circuitry, pressing or depressing the switch just reads 5 volts.I don't want to mod the board, it worked in whatever piece of 70's era gear it used to reside in, I want to make it work only by interfacing to it.anyone run into this matrix topology before? does anyone have tips on how to solve my problem?Freya

author: minifloat
author_rank: Contributor
timestamp: December 02, 2022, 05:58:49 am
content: Hi,Pull all cols low.Pin26 will give you a falling edge in case any key is pressed down. May or may not be used. Scan can be triggered by IRQ or cyclically.Then initiate a scan bystep 1 pulling down cols one-by-one, read rows, pressed key appears as 0, write result to an array astep 2 pulling down rows one-by-one, read cols, pressed key appears as 0, write result to an array bstep 3 compare arrays, debounce, send key events, ...br, mf
help with daves power supply - Page 1
Forum section: electronics / projects

author: mj21
author_rank: Regular Contributor
timestamp: August 22, 2013, 01:02:20 pm
content: i decided to build daves power supply he was working on many months back. lol. i build only the PS bit with out all the digital control. now everything works ok i can set the voltage to anything and the current up to 1.5amps and even more,instead of LT3080 i have build a voltage regulator based on (jung-regulator-2000). it works perfectly with out any oscillation.but when i set the current to anything below 900ma i can draw up to 900ma from the power supply. so say i set the current to 200ma and i check with a volt meter the current pot reads 200mv, when the current draw reaches 200ma the CC led comes on and the voltage of the regulator drops to 100mv but if i try to draw more i can up to 900ma, after 900 no mater how much current i set my dummy load to i can not get more.now i have tested this with my regulator i build or with lm317. same thing.can some one please help.

author: mj21
author_rank: Regular Contributor
timestamp: August 22, 2013, 01:08:34 pm
content: ops looking at the picture i can see i have made mistake on the transistor and the pot for voltage. this is error in my drawing only. the circuit is all OK. i have checked everything like 10 times

author: free_electron
author_rank: Super Contributor
timestamp: August 22, 2013, 01:25:31 pm
content: Lm334 directly on the output of the l 317 ? 10k in series with the input ?Something is seriously wrong with this schematic ....

author: mj21
author_rank: Regular Contributor
timestamp: August 22, 2013, 02:11:17 pm
content: sorry it was late when i draw the circuit, but i have changed it now to the right one.tnx
Help with daylight to dark circuit energizing buzzer - Page 1
Forum section: electronics / projects

author: Qmavam
author_rank: Regular Contributor
timestamp: February 04, 2020, 05:38:14 pm
content: I'm trying to help someone make this circuit, while also trying to get them to understand. (seems to be the harder part.)He had a non working circuit, asking on another group and got so many conflicting answers, many saying the circuit wont work. (good chance it didn't)So I took him offline and just doing emails.The first thing. I got him to built a 555 oneshot. It took a while, but now we can pull pin 2 to ground and the buzzer buzzes 5 seconds. All is good.Next I had him set up, 9v to LDR to resistor to ground, the center point is 5.6v with light and 1v when dark. Then I had him connect this to Pin 2 of the 555. Now he says it is 5.6v with light and 4.3v in the dark. (I don't really get that) He is now adjusting the resistor to pull pin 2 down below 1/3Vc.Where my knowledge is running out is, I know Pin 2 needs to be a pulse otherwise Pin 3 stays high, (as long as Pin 2 is low). That means I need to differentiate the voltage into Pin 2. But I know a slow light to dark transition will fail with a normal differentiation. So I expect I'm going to need a circuit between the ldr and Pin 2. This fellow has a 741 and only PNP transistors. ¯\_(ツ)_/¯Do you have an idea to turn a negative going slow voltage transition into a fast negative pulse?Thanks all.

author: moffy
author_rank: Super Contributor
timestamp: February 06, 2020, 02:53:44 am
content: It would be more helpful if you drew the circuit rather than use words to describe it. Even if its only on a piece of paper and you upload the photo.

author: TerminalJack505
author_rank: Super Contributor
timestamp: February 06, 2020, 05:50:53 am
content: You can use an LM741 op amp as a comparator and do something like the attached. Your friend will need a couple of diodes and some resistors and caps in addition to the LM741. The resistor values will likely need some adjustment.Connect the output of this to the 555's trigger pin.

author: TerminalJack505
author_rank: Super Contributor
timestamp: February 06, 2020, 07:05:06 pm
content: I re-read your post and notice that you are using 9V and not 12V like I used in my example so here's an improved version of the circuit. I put a small amount of pre-bias across the output cap so that the voltage can be pulled down lower than it was originally. I don't think I show the LDR being hooked up the same as you are doing but I'm sure you can figure it out.
Help with designing a circuit - Page 1
Forum section: electronics / projects

author: redgear
author_rank: Frequent Contributor
timestamp: June 30, 2020, 11:55:39 am
content: I am working on a UVC disinfection box. I will be using 4 x 16w UVC tubes from Philips. You can find the data sheethere. The tubes need to be connected to one ballast each. The ballasts are designed to work directly with mains power. I also need to have a timer relay and a temperature sensor to cut-off power automatically when temperature or time limit exceeds. The device should work only when the door is closed. I'm planning to use three microswitches in the same configuration as in a microwave oven. I understand the project is simple and will mostly involve wiring.Here is the basic block diagram of what I have in my mind now.Questions:1) How do I safely connect the mains to my device? How do I include ESD protection, earthing and someother protection to keep the current and power limits within safe levels?2) Is it better to connect the microswitches directly to AC mains or is it better to convert the AC to LVDC and connect the switches to a relay to work only as a signalling device (if the latter is better I think I can go with lower power rated switches)?3) What other things should I be careful with?Thanks
Help with designing simple, compact led strobe circuit. - Page 1
Forum section: electronics / projects

author: gabri.peic
author_rank: Regular Contributor
timestamp: September 01, 2021, 12:44:01 pm
content: Hi everyone. I want to make led Christmas lights with quick bright strobe effects so it looks like a "sparkle" effect.The problem is if i use microcontroller I need to rune a lot of wires and cable would just be too thick...So I was looking at some simple, cheap circuits that I could fit behind each led potted in the heatshrink tubing.I am looking for the effect similar to the airplane strobe (quick bright flash and few seconds off)I did find a circuit that uses optocoupler and seem to give effect that I want but is the optocoupler really the cheapest/simplest option?If anyone knows of any circuit with that "airplane" strobe effect please let me know.Thank in advance.

author: Zero999
author_rank: Super Contributor
timestamp: September 01, 2021, 01:31:38 pm
content: A small, 6 pin MCU, such as the PIC10F200, or similar.

author: woodchips
author_rank: Frequent Contributor
timestamp: September 01, 2021, 05:47:41 pm
content: Do LEDs survive such brutal treatment? Flash tubes used to make a pop when they fired, as the surge of current went through them.

author: gabri.peic
author_rank: Regular Contributor
timestamp: September 02, 2021, 10:50:15 am
content: Hi thanks for the feedback.Small, cheap microcontroller is probably the best option, Also Led should not have any issues because I am not planning on overloading it... Bright white led seem bright enough to me at normal current rating.I will see what I will do.Generic optocoupler led blinker circuit that I found on YouTube seems to give me good results but I will have to see how much the parts will cost.Optocouplers and resistors are dirt cheap on eBay but I will have to see about capacitors since each oscilator needs 220-330uf capacitor to get the rate I want approximately.

author: StillTrying
author_rank: Super Contributor
timestamp: September 02, 2021, 01:21:44 pm
content: Quote from: woodchips on September 01, 2021, 05:47:41 pmFor on times <2% and 1us to 10us wide I've passed up to 800mA through 5mm 15mA LEDs, they all survive.https://www.eevblog.com/forum/chat/20w-halogen-bulb-viewed-by-a-photodiode/msg2411274/#msg2411274But for a visual flashing or twinkling effect very bright microsecond flashes are not much use, to the eye they just look like dim 10ms flashes. So you might as well go for 10ms @ 30mA through a super bright LED, ...or something.Quote from: gabri.peic on September 01, 2021, 12:44:01 pmI don't think you'll get LEDs to look anywhere near the brightness of a xenon tube even if the LEDs are on for 30ms.So bright at night or in a dim room but nothing like a xenon in daylight.Quote from: gabri.peic on September 02, 2021, 10:50:15 amIf they're only on for <100ms you could double the current of superbright LEDs and not worry about it.
Help with determining LED lens type - Page 1
Forum section: electronics / projects

author: hcglitte
author_rank: Regular Contributor
timestamp: November 03, 2021, 10:33:25 pm
content: Hi,I am trying to figure out what the kind of lens which is able to focus a LED die over distance is called.Some cheap telescopic zoom flashlights have them.In the video demo for this flashlight, the LED die is focused on the wall:https://m.aliexpress.com/item/33048502842.htmlAny help is appreciated. Thanks.

author: jbeng
author_rank: Regular Contributor
timestamp: November 04, 2021, 04:01:01 am
content: The type that is in the cheapie led flashlight I have just lying around is a "plano-convex" lens. That is to say, it is flat on one side, convex on the other.

author: ajb
author_rank: Super Contributor
timestamp: November 04, 2021, 04:50:16 am
content: AFAIK all of those flashlights use a fixed reflector and then a moveable plano-convex lens. That's really all you need for a flashlight, since you're not imaging and don't care all that much about chromatic aberration.

author: DeanA
author_rank: Regular Contributor
timestamp: November 04, 2021, 04:53:47 am
content: Have you seen range of LED lenses available from these types of companies:https://www.ledil.com/http://www.carclo-optics.com/http://www.ilenstech.com/
Help with DipTrace schematic component? - Page 1
Forum section: electronics / projects

author: Crambone
author_rank: Frequent Contributor
timestamp: May 15, 2024, 12:16:49 am
content: I’m trying to find a component (NTE7413, IC TTL DUA 4-input NAND Schmitt Trigger) in DipTrace Schematic. I’m just not sure what component it’s under in the scroll down menu?Drew

author: HwAoRrDk
author_rank: Super Contributor
timestamp: May 16, 2024, 04:52:38 pm
content: If itwerethere, it would be under 'IC Logic Gates Inverters', but I couldn't find any kind of 74xx13 in DipTrace's standard library.Looks like you will need to create a component yourself using the Component Editor. It's pretty easy. Note you shouldn't need to create a footprint, as being standard 74-series logic it's probably in a standard DIP package for which a footprint already exists.

author: MarkF
author_rank: Super Contributor
timestamp: May 16, 2024, 06:13:23 pm
content: You're too hung-up on the exact part number.Just find any 4-input NAND with schmitt trigger symbol and the correct foot-print. Then I enter that exact part number into the value properties and display that instead of the name used from the library.OrIf you're absolutely have to have the exact component, you will have to make your own symbol and attach the correct part pattern from the library (or make the pattern also).All you're trying to do is have a schematic showing the correct part numbers and a PCB layout with the component foot-print. Does it really matter how you get there?I have made a lot of my own components to suit my tastes (or missing ones), adding foot-prints from the datasheets, and building 3D step models to attach to each.
Help with driving 7inch display - Page 1
Forum section: electronics / projects

author: vaualbus
author_rank: Frequent Contributor
timestamp: October 18, 2017, 10:00:14 am
content: I just wanna asked for a little bit of help,I have to make a lcd for a project I'm doing at university. The panel I find is either a display that is drivable via spi and is 7inch but it consume a lot of current and the project nead to be low power.So I find this display from displaytech:http://www.displaytech-us.com/7-inch-ips-tftand I can drive it using LVDS.No I wanna use a new pic3mz2048 for doing this job and if needed a small fpga/cpld.Now reading the datasheet of the source driver of the panel I found out that the panel can be controlled either with lvds or with MIPI interface, by swapping resistors.Now If I use a mipi interface I found that I can use this controller SSD2828, that is controlled via spi and the data is send with an rgb interface.So If I chose the second method, I need an external memory for storing the frame buffer, so in my code i will write that memory and then at the end of each frame i will send the memory data to the controller.In that case i better to use an fpga to menage the memory (and generate hsync and vsync) or I can do that with the pic32? Is the pic32 fast enough?Dispate the second method, how the data is send with LVDS? is there any controller avaible for LVDS? Because I can't figured how the data is send using lvds.Thanks for the help, Alberto Vaudagna

author: vaualbus
author_rank: Frequent Contributor
timestamp: October 18, 2017, 10:11:39 pm
content: Really no one have any idea?

author: bson
author_rank: Unknown
timestamp: October 18, 2017, 10:27:57 pm
content: Depends on what clock the pic32 runs at, but a modern 32-bit microcontroller like a Cortex M SoC running at 40-70MHz should have zero difficulty generating MIPI for a 1080p panel, even bit banging it. Don't know about pic32 since I've successfully avoided MIPS for almost ten years now.

author: vaualbus
author_rank: Frequent Contributor
timestamp: October 19, 2017, 06:43:20 am
content: Ok thanks so basically i need an external sram for frame buffer. Hiw tha need to be big? I would like to gave 24bpp so 8bit x each channel

author: vaualbus
author_rank: Frequent Contributor
timestamp: October 19, 2017, 08:25:16 am
content: Quote from: bson on October 18, 2017, 10:27:57 pmBy the way the pic32mz run at 200mhz
Help with Electrolytic cap testing esr circuit - Page 1
Forum section: electronics / projects

author: cleanworkbench
author_rank: Regular Contributor
timestamp: December 14, 2017, 03:56:41 pm
content: I have some electrolytics i want to test , and some 555 ic,s kicking about.Anyone have a relativly simple circuit for a ESR tester using 555, want to use also in conjunction with a scopeThanks

author: danadak
author_rank: Super Contributor
timestamp: December 14, 2017, 04:42:53 pm
content: This might help -http://www.daqarta.com/dw_0o0z.htmhttp://www.diyaudio.com/forums/software-tools/173248-awesome-zlcr-meter.htmlhttp://www.sillanumsoft.org/ZRLC.htmhttp://www.radio.imradioha.org/pc_based_test_gear.htmhttps://makezine.com/projects/sound-card-oscilloscope/http://www.wb5rvz.com/rlc_meter/Regards, Dana.

author: cleanworkbench
author_rank: Regular Contributor
timestamp: December 14, 2017, 05:00:27 pm
content: Looks good, just got to get my head around that lot and see what i can do.Many thanks

author: Freelander
author_rank: Regular Contributor
timestamp: December 14, 2017, 07:16:56 pm
content: Quote from: cleanworkbench on December 14, 2017, 03:56:41 pmHi, I note you ask more for ESR so here is a rather neat design that should suffice. You dont need a scope. Cant get much simpler and surprisingly accurate.https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/Also, a nice little explanatory video that is useful.Enjoy

author: cleanworkbench
author_rank: Regular Contributor
timestamp: December 15, 2017, 08:10:17 am
content: Looks very interesting as well .Thanks again folks.
Help with extension connector used by JBC in equipment DI-1 DE-2 DME-4 - Page 1
Forum section: electronics / projects

author: netandino
author_rank: Newbie
timestamp: February 01, 2019, 06:18:37 pm
content: Good morning colleagues, I'm doing my station controllers for HAKKO and JBC, here is the driver example for 140W hakko that I made "is in Spanish"https://netandino.blogspot.com/2019/01/control-de-temperatura-para-cautin-con.htmlNow I am with a doubt since I do not know which connector are these of JBC and I have a question for you, I hope you can help since I need to know the name and / or characteristics of the connectors used by JBC for extension of the JBC DI equipment. 1 DE-2 DME-4, attached images for more detailsregards

author: tsman
author_rank: Frequent Contributor
timestamp: February 01, 2019, 06:23:04 pm
content: https://www.eevblog.com/forum/reviews/jbc-soldering-iron-stand-wiring/msg375934/#msg375934

author: netandino
author_rank: Newbie
timestamp: February 01, 2019, 08:13:34 pm
content: Hi, I searched for information on the link but there is information, just talk about the pins. I want the name and model of this connector.that to use my bases or JBC stand with its original cables.I have this stand DN-SEhttps://www.jbctools.com/dn-se-stand-for-t210t245t470-na-product-1183.htmlconector for: Stand extension cable Ref. A1286https://www.jbctools.com/a1286-kit-extension-lead-product-135.html

author: tsman
author_rank: Frequent Contributor
timestamp: February 01, 2019, 08:18:02 pm
content: QuoteYou can see the Binder B logo on your connectors.

author: netandino
author_rank: Newbie
timestamp: February 02, 2019, 02:18:33 am
content: Thanks for your support, I found the connector with these dates:* Binder, 7 Pole Panel Mount Miniature Connector Socket, Female Contacts* BINDER - 99 0622 00 07 - SOCKET, FREE, 7WAY , 678 SERIES
Help with formula - Page 1
Forum section: electronics / projects

author: lolalright
author_rank: Newbie
timestamp: July 15, 2017, 11:12:12 pm
content: So i wanted to use a dspic but i couldn't understand one of the formulas so i watched a video and the person used it but i think i missed a value or somethingcmref(9:0) * intref/1024 = vrefin the videointref is equal 1.32vref = 0.35cmref = 271i have searched the datasheet top to bottom but i dont get how he's getting the cmrefeven tryed swapping out cmref with vref but it just makes no sensedatasheet:http://ww1.microchip.com/downloads/en/DeviceDoc/70000591f.pdf

author: sokoloff
author_rank: Super Contributor
timestamp: July 15, 2017, 11:16:54 pm
content: Link to the video will help people to figure out what's going on and how to help you...

author: lolalright
author_rank: Newbie
timestamp: July 15, 2017, 11:18:51 pm
content: it's about 13 minutes in

author: sokoloff
author_rank: Super Contributor
timestamp: July 15, 2017, 11:21:19 pm
content: You set the cmref to the value that will yield the Vref that you want.Using the internal reference voltage (typical value 1.32V), to get a Vref of 0.35, you need to set bits 9->0 of cmref to 271.So that:271 * 1.32 / 1024 = Vref , in this case, 0.349 volts.

author: lolalright
author_rank: Newbie
timestamp: July 15, 2017, 11:24:29 pm
content: thank you! That makes me sense to me normally I'm pretty good about picking up on things like that but that one threw me for a loop!

author: sokoloff
author_rank: Super Contributor
timestamp: July 15, 2017, 11:24:44 pm
content: Or, solving for the cmref(9:0) value that you need, re-arrange the equation thusly:cmref(9:0) = Vref * 1024 / intrefcmref(9:0) = 0.35 * 1024 / 1.32 = 271.5 (pick 271 or 272)
Help with Fully Differential Op amp - Page 1
Forum section: electronics / projects

author: justinjja
author_rank: Regular Contributor
timestamp: July 04, 2013, 07:37:27 pm
content: Im working on a Class D amp with a 33k ohm input impeadance. To get a flat frequency response I need ~10uF input caps.Because I already have preamps in the circuit, I thought I might be able to use smaller caps and compensate for them like this:This simulates fine,But im using a fully diferential op amp to convert a single ended input into a differential one like this:Is it possible to compensate for smaller caps with the differential op amp?Thanks for the help,Justin

author: Paul Price
author_rank: Super Contributor
timestamp: July 05, 2013, 08:44:17 am
content: You would be wiser to use an op amp as a voltage follower feeding directly to your class d input, this way you could have a very high impedance input into the follower and use, for example .01uF capacitors into a 10-meg input resistance of the voltage follower (as a load to ground) and still get excellent low frequency response.

author: justinjja
author_rank: Regular Contributor
timestamp: July 05, 2013, 10:19:43 am
content: I had considered that, its an option,but it would require an op amp to drive the common mode voltage on my differential amps,and it would have to be a very low offset device,Because any offset would be amplified and then passed as DC to speakers
Help with HP 3455 reference module schematic - Page 1
Forum section: electronics / projects

author: Tallie
author_rank: Regular Contributor
timestamp: March 24, 2016, 12:40:03 am
content: I recently purchased an HP 3455 voltage/resistance reference module... 3455-66511. It's the A model... 11177A-3165. I need help getting the 10v reference out of it... Where do I apply power, how much power do I apply, and where do I sense? A schematic would help. Thanks in advance!

author: barnacle2k
author_rank: Regular Contributor
timestamp: March 24, 2016, 02:12:50 am
content: there is a thread for that:https://www.eevblog.com/forum/testgear/teardown-hp-3455a-reference-module-11177b-01723/Be very careful to connect the grounds correctly in order to NOT blow up the LM399.
Help with identify a connector - Page 1
Forum section: electronics / projects

author: cs.dk
author_rank: Unknown
timestamp: September 15, 2018, 09:52:23 am
content: Can someone tell me the name of this connector?I have trawled though tme.eu, digikey and others with no success so far.

author: jdraughn
author_rank: Regular Contributor
timestamp: September 15, 2018, 05:55:51 pm
content: Does this help any?https://www.amazon.com/6-way-Connector-Harness-Pigtail-Mazda/dp/B01BN6D8JO

author: cs.dk
author_rank: Unknown
timestamp: September 16, 2018, 05:25:56 am
content: Thanks,No one of them names the connector. I know it is for air flow meters on Ford/Mazda and also JCB industrial engines.

author: Niklas
author_rank: Frequent Contributor
timestamp: September 16, 2018, 11:20:14 am
content: Could it be Yazaki?

author: cs.dk
author_rank: Unknown
timestamp: September 16, 2018, 11:23:03 am
content: I'll browse their catalogue. Thanks for the suggestion.I have never heard that name before.

author: rf+tech
author_rank: Frequent Contributor
timestamp: September 16, 2018, 11:33:27 am
content: My first impression is it looks like a Deutsch product, possibly DT series, but could be an AMP product or any other manufacturer of sealed automotive connectors.http://www.te.com/usa-en/products/connectors/automotive-connectors.htmlTrawl through the housings selector for a match, then you'll know the name.http://www.te.com/usa-en/plp/automotive-connector-housings/Y30Dy.htmlRF+ Tech

author: Benta
author_rank: Super Contributor
timestamp: September 16, 2018, 03:46:31 pm
content: It being Ford/Mazda, you can be pretty sure it's not a standard connector. But there are companies making aftermarket connectors.
Help with identifying a connector - Page 1
Forum section: electronics / projects

author: V3rzeT
author_rank: Newbie
timestamp: September 02, 2020, 07:44:55 am
content: Hi, I have been searching for a while for a "molex" 4-pin 90 degrees DIP connector, I couldn't find any on LCSC (the website where I buy most of my components) and couldn't find any on Mouser either.This is the connector I am looking for:If anyone knows any compatible connector that I can get on LCSC (or if not, then Mouser), please let me know!

author: bob91343
author_rank: Super Contributor
timestamp: September 02, 2020, 08:39:33 pm
content: Looks like the standard floppy disc power connector.

author: WattsThat
author_rank: Frequent Contributor
timestamp: September 02, 2020, 08:51:12 pm
content: Yep, dead standard mate-n-lochttps://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1-480424-0?qs=ko0lFLRalIOE%2FKdC2RXHBg%3D%3D&gclid=Cj0KCQjwhb36BRCfARIsAKcXh6FpUjprvv7SQs0bFouNSNdxzjvyt2JGmPAIGv3UTfweWHnWkhixROMaAmBVEALw_wcB

author: V3rzeT
author_rank: Newbie
timestamp: September 03, 2020, 12:12:35 am
content: Thanks, after looking through TE's website, it seems like I found exactly what I need, 770846-1 it's the same connector that you sent but just 90 degrees and wire to board.
Help with identifying old SMD aluminium caps - Page 1
Forum section: electronics / projects

author: niino
author_rank: Contributor
timestamp: October 14, 2020, 09:27:02 pm
content: I am currently working on an old 486 laptop which shows some symptoms of aging (but works fine otherwise), and as a first step, I wanted to replace the electrolytic caps of the power supply section on the main board. There, I found these nichicon caps.They are rated for 85°C, have vents and a yellow plastic sleeve with all the markings on it (rather than having it printed on the top of the can). They don't have any markings denoting the series/type. To find a suitable replacement, I need to identify the series. I already looked up the oldest version of the nichicon product lineup I could find (from 1999; this computer is from 1994-1995), but it already didn't have a series matching the caps inside the computer.How should I proceed to identify the series? Or does by chance someone reading this know what series they are?A picture of the caps is attached.
Help with IDing old Dale resistors - Most likely from Motorala Phoenix AZ - Page 1
Forum section: electronics / projects

author: AE7OO
author_rank: Regular Contributor
timestamp: May 02, 2020, 01:29:04 am
content: Greetings,I bought about 100 Dale 1.21K 3% .5w resistors from a local surplus house, and for the life of me can not find a datasheet or any info about them(besides what is printed on them).From past experience there, and the location within the warehouse, these were most likely part of the sale off from when Motorola shutdown most of their Phoenix, AZ operations.I've entered every combination of numbers and while I get what looks like visual matches, I can't seem to get anything close to the printed specs.Here is all of the numbers printed on the resistor, along with a couple of photos.DALE43A114437P341210-ohm symbol-3%.5WThey seem to look like the LVR series, but those seem to be 1% resistors that start at 1W and not 1/2W 3% resistors.
Help with IoT water flow monitoring schematic - Page 1
Forum section: electronics / projects

author: cjacky475
author_rank: Newbie
timestamp: August 31, 2025, 03:10:18 pm
content: Hello everyone,I’m building an IoT water flow monitor and would like some feedback on my schematic.Hardware:Arduino Pro Mini 3.3V.Water flow sensor (5V~15V(DC)).LoRa module (3.3V).Resistor, capacitor, fuse, LDO regulator, 5V boost converter.What I want to do:Read pulses from the water flow sensor.Send readings over LoRa to a remoter receiver each minute only when accumulated flow is > 0, otherwise - sleep (preserve battery).My questions:Does this schematic look reasonable forsafe and reliable operation?Are there anyimprovementsI should consider?Is this design suitable forlow-power/battery operation, or are there inefficiencies?I'd really appreciate feedback on the schematics (file is attached). Thanks.

author: xvr
author_rank: Frequent Contributor
timestamp: August 31, 2025, 05:43:59 pm
content: C1 connected in a wrong way.Power consumption of YT-B5 is 15mA that is too much for battery powered device.
Help with IRF530N mosfet question - Page 1
Forum section: electronics / projects

author: vk3pb
author_rank: Contributor
timestamp: June 13, 2014, 08:58:47 am
content: Hi allI have just finished building a 40m transceiver kit from cr-kits (KNQ-7A)http://crkits.com/Unfortunately when tuning up the rig I blew the IRF-530N mosfet. I have purchased a couple of IRF-530NPBF mosfets which appear very similar. Can I substitute one of these for the IRF-530N?cheers Peter

author: Richard Head
author_rank: Frequent Contributor
timestamp: June 13, 2014, 11:33:17 am
content: It looks like the only difference is the new ones are lead free.

author: Psi
author_rank: Super Contributor
timestamp: June 13, 2014, 11:56:59 am
content: Most of the time the letters on the very end of a IC/semiconductor part number are do with chip footprint, packaging type (eg tape/reel), lead free , speed grade, temp ratings etc.. things that can often be ignored without much of a problem.Of course you will eventually get bitten if you do ignore them all the timeeg,- on AVRs L = low voltage version- on some TVS diodes CA = unidirectional vs bidirectional

author: dannyf
author_rank: Super Contributor
timestamp: June 13, 2014, 01:00:58 pm
content: QuoteIt probably makes more sense to figure first why the one you put in died.
Help with isolated voltage and current sensing - Page 1
Forum section: electronics / projects

author: Dreadrik
author_rank: Newbie
timestamp: February 23, 2023, 10:31:43 am
content: Hi!I am building a solar powered smart greenhouse system as a hobby project and have stumbled on a interesting problem:I would like to monitor voltage and current on three different places in my setup: solar panel, battery and load. The problem is that my cheap solar charge controller does not have common ground connections on the input/outputs, but instead shares the positive. I have not found any reasonably cheap voltage/current sensors that (I think) can handle this scenario. The biggest issue all of them have is that their signal ground is shared with the digital ground, making it very difficult to hook them up to them same MCU.Is there any workaround for this?I could isolate the i2c bus for the battery and solar voltage sensors, but that means I must also have dc/dc converters for each sensor so that they have their own supply. That would not really work for the solar side since it isn't always sunny enough.See attached block diagram for more details.Best regards / Fredrik

author: jonpaul
author_rank: Super Contributor
timestamp: February 23, 2023, 10:52:45 am
content: 4 wire kelvin current sense resistancedifferential amplifierj

author: coromonadalix
author_rank: Super Contributor
timestamp: February 23, 2023, 11:13:31 am
content: you have hall effects sensors ... allegro ACS seriesand yes the problems with some small panels meters, they share some common ground etc ...and yes you have fully isolated dc-dc converters (ground too)a friend did this with separated panels meters, the ones who doesn't have common current and voltages measurements pins

author: dobsonr741
author_rank: Frequent Contributor
timestamp: February 23, 2023, 03:23:19 pm
content: I suggest checking the TI.com battery management portfolio. From simple analog frontend to all the way up to fault tolerant monitoring in automotive environment. Current monitoring is usually only at one point - do you relay need current on each battery? If so, perhaps mix in the hall sensors.https://www.ti.com/power-management/battery-management/monitors-balancers/overview.html
Help with Kitchen Hood controls - Page 1
Forum section: electronics / projects

author: gutierrjgELE22
author_rank: Newbie
timestamp: May 26, 2022, 06:54:20 pm
content: Hi to all!I would like to add a remote fan to a kitchen exhaust fan. I need to be able to turn it on/off from any of the first three speeds that the kitchen exhaust has. I already have relay to control that remote fan but nut sure how make it work. as you can see in the image attached the controls has Blue for High, Brown for Med, Gray for low speed.Any help will be appreciated.Thanks
Help with led driver chip identification  - Page 1
Forum section: electronics / projects

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 27, 2019, 06:02:48 pm
content: Hi folks,I have here some nice LED panel power supply and I want to hack in. But I cannot found anything about this control chip.It look like something fairly new and using modern topology.It have no input capacitor just PFC choke and single discrete transistor to switchAnd it is all digitally controlled by MSP430 trough I2S bus (with CC2500 wireless chip)Regulation is done from primary side to constant current outputChip marks:iW640117426RAA

author: JackJones
author_rank: Regular Contributor
timestamp: March 27, 2019, 06:29:39 pm
content: This does come up with search:https://www.dialog-semiconductor.com/products/lighting/solid-state-lighting/iw6401

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 27, 2019, 06:33:38 pm
content: Quote from: JackJones on March 27, 2019, 06:29:39 pmThanks a lotThis look exactly like what I have here

author: JackJones
author_rank: Regular Contributor
timestamp: March 27, 2019, 06:37:11 pm
content: I think I found the datasheet but can't get the link opened:http://www.yuhaoic.com/Uploads/file/20151010/20151010082442_31014.pdfThere is a cached version but it doesn't look very readable:https://webcache.googleusercontent.com/search?q=cache:jUyR5cbdt3MJ:https://www.dialog-semiconductor.com/sites/default/files/dialogiw6401smartexitemar2016english.pdf+&cd=2&hl=en&ct=clnk&gl=fiEdit: There we go:https://datasheetspdf.com/pdf-file/1264601/DialogSemiconductor/iW6401/1
Help with LTspice and TI LM2940 - Page 1
Forum section: electronics / projects

author: Audiofanman
author_rank: Contributor
timestamp: March 02, 2025, 11:35:54 pm
content: Hey folks,Im not sure if this is the correct forum, excuse me if its slightly OT...I downloaded the LM2940-N 9.0V Unencrypted PSpice Transient Model fromhttps://www.ti.com/product/LM2940-N#design-tools-simulationI unzipped the compressed file LM2940-N_9P0_TRANS.LIB and placed into my LTspice project folder,Opened the .LIB file in lTspice, right clicked the line .SUBCKT LM2940-N_9P0_TRANS IN OUT GND_0 GND_1and let ltspice help create a symbol...I have the following as a SPICE directive,.include LM2940-N_9P0_TRANS.LIBcircut works fine.However, when I use the same device in another circuit that previously had an LT1085 the circuit voltage goes up to 1.16KV !?!Has anyone ever seen such weirdness and if so, any hints on correcting would be greatly appreciated!Quote

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 03, 2025, 02:30:41 am
content: Hi,The subckt line has four nodes, the symbol should have four pins. There are two ground pins..SUBCKT LM2940-N_9P0_TRANS IN OUTGND_0GND_1The symbol that was created has four pins:With both grounds connected, it seems to work fine.Jay_Diddy_B

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 03, 2025, 02:35:56 am
content: Can you add the .asc file that doesn't work to the thread?Jay_Diddy_B

author: Audiofanman
author_rank: Contributor
timestamp: March 03, 2025, 07:21:02 pm
content: (Edited for clarity)I originally added the 2nd ground pin directly on top of the 1st ground pin, when I saw the strange voltagesI modified the .asy to have separate grounds.Wiring both to ground still have the same result :-(I am a newb, but will try to attach as much as I can later tonight or tomorrow...

author: Audiofanman
author_rank: Contributor
timestamp: March 04, 2025, 12:31:16 am
content: @Jay_Diddy_B, drew your example and my results match yours...Will get the .asc file up in a second...

author: Audiofanman
author_rank: Contributor
timestamp: March 04, 2025, 12:43:06 am
content: Attached is my .asc file.If I replace the LM2940 with the LT1085-12 the net labeled "trouble-here" works as expected, (I dont remember the exact voltage but believe it was about 12v).With the LM2940, I get over 1KV...Ultimately

author: Zero999
author_rank: Super Contributor
timestamp: March 04, 2025, 09:29:53 am
content: I couldn't get it to work either.I don't have your symbols (please attach them in a zip in future) and couldn't be bothered to make my own, so I just put some spice directives with the subcircuits connected to the relevant nets.