hybridfree/eevblog-posts huggingface dataset:
Issues with DotStar HSV colors - Page 1
Forum section: electronics / beginners

author: Youkai
author_rank: Regular Contributor
timestamp: June 13, 2022, 09:34:38 pm
content: I'm trying to get a dotstar strip working and I'd like to use HSV because it will make shifting the hue to nearby colors and also the brightness easier than RGB. I'm having trouble though with the picking of the correct hue numbers for colors. I'm looking at the image under HSV herehttps://learn.adafruit.com/adafruit-dotstar-leds/arduino-library-useand trying to put in the numbers that it would expect.10922 gave me a yellow. 21845 did not give me green, and a number around 34000 did not give me a blue/teal color. I can't figure out what numbers I should use to get the correct colors.This my color assignment line:Code:uint32_t colorWave = strip.ColorHSV(21845, 255, 255);Anybody figured this out?

author: tooki
author_rank: Super Contributor
timestamp: June 13, 2022, 10:27:50 pm
content: Are you sure your LEDs use the default byte order for the colors? As stated farther down the page, the different manufacturers (or even batches) of these things don’t always use the same order for RGB, so you can set the order via a parameter. You can test what you’ve got by writing pure red, green, and blue and seeing what comes out.P.S. You might want to try the FastLED library instead of Adafruit’s. It has much more robust HSV support, as well as specific functions for performing math on the colors (like brightness or hue).https://github.com/FastLED/FastLED/wiki/Pixel-reference#chsv

author: Youkai
author_rank: Regular Contributor
timestamp: June 14, 2022, 03:47:27 am
content: OK thanks for the info. I'll check out the fastLED and also check the color order.

author: Youkai
author_rank: Regular Contributor
timestamp: June 19, 2022, 04:11:33 am
content: Quote from: tooki on June 13, 2022, 10:27:50 pmTurns out I needed DOTSTAR_GBR to work correctly. Thanks.

author: tooki
author_rank: Super Contributor
timestamp: June 19, 2022, 12:39:10 pm
content: Glad to help!
Issues with FT230XS negotiating for power - Page 1
Forum section: electronics / beginners

author: pratiken
author_rank: Contributor
timestamp: October 08, 2015, 05:30:06 pm
content: Hi!!Hopefully I can explain this as clearly as possible.So I have a USB hub board (Control Hub) that contains MAX3421 USB Host IC's and is controlled via a PIC32. The interface to (Control Hub) is an FT230XS. Control Hub requires about 230mA without any USB devices plugged into the MAX3421 ports.I'm having some power issues with only some USB ports.When I plug Control Hub into a USB port, it boots up fine and I can access the PIC32. When I plugin a 50mA USB device into one of the MAX34 ports, the PIC32 crashes and begins rebooting continuously even though the system is only using ~280mA...Here's the kicker. This only occurs on some USB ports. I've tried 5 different powered USB 2.0 hubs, and 2 of them did not work. The other 3 worked perfectly an I was allowed to plug in additional USB devices to Control Hub.Some laptop ports did not work as well.1A USB wall chargers work fine too.I've used the FT_PROG application to program the FT230 to use request 500mA.How do I get this system to be more consistent with the USB ports that power it?I have CBUS3 set to PWREN#. Am I supposed to do something to the Pin16? Ground it??Thanks for your help. This is frustrating.

author: Jeroen3
author_rank: Super Contributor
timestamp: October 08, 2015, 06:26:06 pm
content: I bet the software controlling the MAX3421E is to blame.USB does specify limits for power use and negotiation. But I've yet to encounter a strict implementation of these. And if they do, they'll tell you.The PWREN# signal is to wire to a high side switch or mcu to tell that the "high power" part of the device is allowed to enable.But, is your VBUS within spec?
Issues with LTspice XVII Update - Page 1
Forum section: electronics / beginners

author: ChanceMcCrance
author_rank: Newbie
timestamp: September 01, 2018, 01:15:23 am
content: When I opened LTspice XVII this afternoon, it said that it had been over a 100 days since I last had the software updated. I chose the option to begin the update and this 25MB update has been going on for well over three hours. It seems to have gotten stuck at 26% which is specifically the /PowerProducts/LTC3813.asy.gz file.Has anyone else encountered this issue? If so, where you able to find a way to get around it and complete the update?

author: Microcheap
author_rank: Frequent Contributor
timestamp: September 01, 2018, 02:05:28 am
content: I think you must run LTspice as administrator in order to be able to update it. If it doesn't work, simply download a new installer:http://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html

author: iMo
author_rank: Super Contributor
timestamp: December 19, 2018, 12:24:19 pm
content: I've discovered today the latest LTSpice VII stops working when "EchoLink" application is installed.Removing the EchoLink enables LTSpice again.Tried on 2 machines, Win7 64bit..
Issues with USB data cable + USB powered HUB - Page 1
Forum section: electronics / beginners

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: May 11, 2019, 07:42:48 pm
content: Hi.I have a USB powered which is disabling data on certain USB data cables that i recently got , some cheap ones from local store. As soon as i unplug the power cord of the HUB and replug the USB to my PC data is now available. For the record, monitor, laptop and USB power bus, are not connected to earth and they are plugged in the same strip adapter. If i plugged old / good data cables it is fine. are there any shorts on these cables ? I can return one of them at least if thats the case.

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: May 18, 2019, 09:36:34 pm
content: I think i've trace a clue to this problem and it lies on the lack of shielding on those two cables that disables data on the USB powered hub, at least one of them it has the splitted wires, the LED channel in middle but no shielding so i'm assuming that the other cable has the same thing.I'll check if GND is connected to shield when i get one usb female THT.

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: May 22, 2019, 10:38:59 pm
content: Well should said what Hub model was in first place.... is this. The original power cord long gone... I'm using a nimo 5V 2A power cord, but using another the result is the same.http://www.lifetech-world.com/productdetail.cjp.htm?id=88And yes the cables that blocks data pins are not shielded :S

author: malagas_on_fire
author_rank: Frequent Contributor
timestamp: July 27, 2019, 07:14:45 pm
content: Looks like got another USB to micro cable that has the same problem as the previous which disables the data pins and gives cable error. Well looks like the USB hub has two pairs of USB and if i plug a USB mass storage + the dubious cables the HUB works fine, because it raises the USB power from 5.01V to 5.11V and compensates the resistance of this particular cables.So it solved.[Edit...]One good thing about this USB HUB it doesn't backfeed when powered externaly
It is safe to charge a battery with a variable DC switching power supply? - Page 1
Forum section: electronics / beginners

author: jcc
author_rank: Newbie
timestamp: August 18, 2020, 10:35:54 pm
content: Greetings,I have two power supplies. A small 3-amp linear DC and a 20 amp switching power supply (Model 1688B). The manual of the 3 amp linear says it can be used to charge batteries. But the 20 amp says nothing about charging batteries. I ask because of this. If I connect the batteries, with the power supply turned off, I get a spark. I performed several tests, and this is what I found. Voltage increase from zero to battery voltage (multimeter in series) in about 2 to 4 seconds. Can’t measure the inrush current. But once connected there is a steady 0.018 amps draw (from the battery). I know that I can’t leave it connected, while off for several days, because it will discharge the battery (230 amp hours). I know if the power supply is on there is no problem. I have charged several batteries. But I’m worried if I lose power in the middle of the night. The spark and steady voltage increase up to battery voltage must be a capacitor charging. And the 0.018 amps must be the capacitor leak. If it is safe, if the power supply lose power (unattended), fire hazard wise, then I have no problem with the leakage. The battery will only be unattended during the night. What do you think? It is safe?

author: atmfjstc
author_rank: Regular Contributor
timestamp: August 18, 2020, 11:37:21 pm
content: In general, it is not advisable to leave the charging process unattended, especially with lithium batteries and with equipment that is not specifically designed for charging...

author: perieanuo
author_rank: Frequent Contributor
timestamp: August 19, 2020, 07:49:58 am
content: what type of battery?you can charge lithium or lead batt with adequate setup if your supply has constant-current control (lithium charges with cc first and after reaching some level it has to switch to cc charging, so you can charge Li batteries setting some accordingly voltage AND when current limited to 1/10 or less of battery capacity)read the Li-ion charging methodsfor lead, just put the voltage and limit the current to protect your supply for heatingReal AAA batteries, you can't charge REAL batteries, only accusI specified guide lines, read yourself at least li-ion charging specsregards,pierre

author: BILLPOD
author_rank: Frequent Contributor
timestamp: August 19, 2020, 02:17:39 pm
content: I do this, but I NEVER leave it unattended. Also, my power supply doesn't draw from the battery when off <strange>. A diode will prevent battery voltage from backfeeding the charger. Make sure it is large enough to handle your current, and remember that you will lose 0.7 volts through the diode when charging.
it05sh - Page 1
Forum section: electronics / beginners

author: acsventas
author_rank: Newbie
timestamp: February 05, 2020, 08:22:20 pm
content: Is anyone knows the manufacturer logo or the real part number of the transistor in the image?

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: February 05, 2020, 09:22:43 pm
content: I couldn't find anything ad-hoc, but could it be a bog standard 7805? Looks like it is near some input connector on the left.

author: acsventas
author_rank: Newbie
timestamp: February 05, 2020, 09:57:31 pm
content: Thanks for your orientation,

author: stewie
author_rank: Newbie
timestamp: July 11, 2023, 06:54:00 pm
content: It's a TRIAC from Hutson Industries (defunct).https://rtellason.com/semiconductorlogos.htmlI assume you're repairing a PACE station? I replaced it with BTA06-600B and it works fine. Any standard triac should work, just make sure it supports Q4 since the electronics seems to be using Q1-Q4. Also check the 0R1 2W wirewound resistor that is between the triac and the heater. Mine turned out to be 3R and had to be replaced as well.
IT8528 ISP RT809H - Page 1
Forum section: electronics / beginners

author: IsuissaX
author_rank: Newbie
timestamp: May 25, 2025, 02:23:24 pm
content: Hi all,I am struggeling with an IT8528 EC.I am using the RT809H to read it through SMBUS, in the software terminal i can see that the programmer identify the EC, reads it but always fail when verifing.I have a board with dedicated pins for EC debbuging:GNDEC_SMCLK_DEBUGEC_SMDAT_DEBUGIn addition i have 10 ping for JLPC with the pinout but i have no idea how to connect them to the ID10 ISP of the RT809H.The board model is EBM-BYTANY HELP would be much appreciated.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 25, 2025, 04:16:46 pm
content: DONT double post it annoy peoplehttps://www.eevblog.com/forum/repair/ite-it8528-ec-using-rt809h/msg5925752/#msg5925752

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: May 30, 2025, 11:17:15 am
content: Quote from: IsuissaX on May 25, 2025, 02:23:24 pmDon’t rely on SMBus for full EC programming. Use JLPC to connect to RT809H ID10 ISP port.
ITEAD intelligent switch - Page 1
Forum section: electronics / beginners

author: Isaac Newton
author_rank: Contributor
timestamp: March 16, 2013, 04:54:35 pm
content: Hi, guys!Well, I was visiting the ITEAD Studio website and I found this:http://blog.iteadstudio.com/itead-intelligent-switch-installation-tutorial/They say that the wiring of this thing is a "in line" wiring, or something like that and I don't understand how can they make it receive the power it needs to function and disconnect the load at the same time! I can assume that they are using some kind of storage method to store energy or they are just controling the amount of voltage that gets to each device in series, like a voltage divider... But, again, I'm just assuming and still I don't know how they can accomplish that...

author: cyr
author_rank: Frequent Contributor
timestamp: March 16, 2013, 05:23:13 pm
content: I would assume the same way that my z-wave (wireless) dimmers work, they draw a small current through the load even when "off".

author: Isaac Newton
author_rank: Contributor
timestamp: March 16, 2013, 06:59:25 pm
content: So they just control the impedance of the light switch? Can someone draw a block diagram or a simplified circuit?

author: Paul Price
author_rank: Super Contributor
timestamp: May 25, 2013, 09:41:46 pm
content: http://www.google.dk/imgres?imgurl=http://www.bristolwatch.com/ele/img/dimmer_220.gif&imgrefurl=http://www.bristolwatch.com/ele/triacs.htm&h=269&w=541&sz=5&tbnid=tq9uuZYFK0xkXM:&tbnh=61&tbnw=122&zoom=1&usg=__Bm4sLZYy8mweo2xfJ2qXeSW8rx0=&docid=6HSvtRSdqnv4JM&sa=X&ei=bS-hUYnXMany4QTI5ICgAw&ved=0CD4Q9QEwAw&dur=3870Isaac Newton: Google it!
iterating serial ports to identify the target device - Page 1
Forum section: electronics / beginners

author: faekjarz
author_rank: Regular Contributor
timestamp: April 21, 2017, 11:59:35 am
content: Hey there, enginerds!I madethis thinga few whiles ago and now i'm fed up of manually starting the thing every time. I want to "daemonize" the driving shell script. I want it to be started automatically on boot. I intend to modify the driver script and create a systemd unit file (which i will publish in the project thread).In my case there are, at times, multiple serial devices (/dev/tty?*) connected to the host, and i'd like to pick _that one target device_.The first approach, i thought of is to iterate every /dev/tty**?? (serial port, on Linux), connect to it, read, and expect a certain reply string, e.g. "OhaiIAmTheTargetDevice" …then pick that serial port.1) Am i taking a detour, or is it the right direction?2) Is there an industry standard method for iteratively identifying "ttyserial" devices, i'm not yet aware of?3) Examples, Experiences, HowTos, Guides, Links… anyone?

author: Jeroen3
author_rank: Super Contributor
timestamp: April 21, 2017, 12:25:48 pm
content: 1) No. Be polite and don't send random stuff to devices you don't know. Instead, listen for announcements.2) Ask for hardware identification of the USB port. PID/VID should already exclude many ports.Or don't use virtual com/tty, you can write directly to one or multiple usb endpoints.3) Libusb?

author: BradC
author_rank: Super Contributor
timestamp: April 21, 2017, 01:44:17 pm
content: Here's a good start. This details the old serial plug and play spec and explains how to do it in a manner that most serial devices won't mind or may even be expecting.http://www.osdever.net/documents/PNP-ExternalSerial-v1.00.pdf

author: voltsandjolts
author_rank: Unknown
timestamp: April 21, 2017, 02:00:51 pm
content: If you are not adverse to using FTDI:1/ Program the FTDI with your chosen serial number.2/ Install the FTDI D2XX driver.3/ Use FT_OpenEx() with FT_OPEN_BY_SERIAL_NUMBER

author: Monkeh
author_rank: Super Contributor
timestamp: April 21, 2017, 02:05:29 pm
content: Quote from: faekjarz on April 21, 2017, 11:59:35 amUse a device with a unique serial number, employ udev to create a symlink. Sorted.

author: faekjarz
author_rank: Regular Contributor
timestamp: April 21, 2017, 03:27:39 pm
content: Thanks everyone, so far.Keep the input flowing, if you like.Now i'm busy reading the PDF @BradC mentioned …I'm on page 9 now "1.2. Device Implementation Considerations" …interesting…I'd like to mention@honx on twitter, whomentioneda tool for programming a unique serial into a Prolific PL2303 and using udev.
Its A designer's guide to Innovative Linear Circuits by Jim Williams  - Page 1
Forum section: electronics / beginners

author: stoica adrian
author_rank: Contributor
timestamp: September 02, 2016, 06:58:35 am
content: Hi,What do you think, itsA designer's guide to Innovative Linear Circuits by Jim Williamsa good book for someone who wants to learn electronics design. I mean for a person who has only basic knowledge? or it's too heavyThanks,

author: DTJ
author_rank: Super Contributor
timestamp: September 02, 2016, 07:01:54 am
content: Preview it:http://www.introni.it/pdf/Williams%2006%20-%201995%20-%20EDN%20-%20A%20designer's%20guide%20to%20Innovative%20Linear%20Circuits.pdf

author: KE5FX
author_rank: Super Contributor
timestamp: September 02, 2016, 08:05:05 am
content: Better to go with the ARRL Handbook if just getting started, or Horowitz & Hill 3rd ed. otherwise. Most of the material you will find by Jim Williams was written for practicing EEs.

author: LvW
author_rank: Frequent Contributor
timestamp: September 02, 2016, 02:55:07 pm
content: Quote from: stoica adrian on September 02, 2016, 06:58:35 amPerhaps not "too heavy" - but not suited at all for somebody who wants to learn something. It is no real textbook but - more or less - a collection of application circuits.I think, for your purpose there are many, many other textbooks on electronics - for example, "Art of Electronics" by Horowitz/Hill .

author: rstofer
author_rank: Super Contributor
timestamp: September 02, 2016, 05:19:22 pm
content: So, the first 7 pages are all 'gotcha' circuits. That's as far as I'll go with it...
ITT 21032 24-pin IC identification - Page 1
Forum section: electronics / beginners

author: eev_fan
author_rank: Contributor
timestamp: January 30, 2024, 12:50:16 pm
content: I pulled some of these 30 years ago. Anyone who knows what they are?

author: CaptDon
author_rank: Super Contributor
timestamp: January 30, 2024, 02:11:39 pm
content: I don't know based on part number. I actually inspected natural gas control valve circuit boards years ago for I.T.T. Grinell in Columbia Pennsylvania. What duty were the circuit boards you pulled these from? Furnace control, HVAC, Oil Field? My first guest would be 2K / 4K Rom, PROM or RAM. Next guess might be MUX / DEMUX like 74150 or 74154? Final guess would be something 'customized' for I.T.T., but not likely because most custom chips back around that date code in DIP-24 bodies were housed in or on ceramic bodies and looked more exotic.

author: eev_fan
author_rank: Contributor
timestamp: January 30, 2024, 02:44:39 pm
content: Quote from: CaptDon on January 30, 2024, 02:11:39 pmMany thanks. Unfortunately I don't remember any more, but I have around 20 of them so some kind of memory could be right. They have been socketed.It's the only ones of a big 'pull-collection' that I haven't been able to identify.

author: SeanB
author_rank: Super Contributor
timestamp: January 30, 2024, 04:31:56 pm
content: Probably a mask ROM, ITT was quite popular for those, as they would do them in smaller volume, and in the EU this was faster than sending off to the USA to get them.

author: eev_fan
author_rank: Contributor
timestamp: January 31, 2024, 05:18:53 pm
content: Quote from: SeanB on January 30, 2024, 04:31:56 pmThanks, but all looks identical, apart from different date codes. I'm sure I didn't pull them of 20 cards. Most probably they must all be from one, or just a few, cards.
iTunes U UC Berkeley Engineering Courses - Page 1
Forum section: electronics / beginners

author: redek
author_rank: Contributor
timestamp: May 14, 2010, 05:41:21 am
content: ITunes has a number of free EE course Videos. If you are beginning I would check out the UC Berkeley "Electrical Engineering 40: Introduction to Microelectronic Circuits". I started watching a few while reading the forum. They start by introducing rudimentary circuit analysis and KCL. Should be quite helpful for beginners. Hopefully they are available outside the US. Here is the linkhttp://deimos3.apple.com/WebObjects/Core.woa/Browse/berkeley.edu.1621931143

author: rossmoffett
author_rank: Regular Contributor
timestamp: May 14, 2010, 06:03:38 am
content: UC Berkely has a YouTube channel also, probably with all of the same lectures.

author: Unknown
author_rank: Unknown
timestamp: May 14, 2010, 01:29:42 pm
content: And something similar from MIT:6.002 Circuits and Electronics

author: thedigitalprincess
author_rank: Contributor
timestamp: May 15, 2010, 07:36:19 am
content: Quote from: alm on May 14, 2010, 01:29:42 pmI watched a few minutes from the first few lectures. It's so different to what they teach us in the trade level course.I'd really love to have a few hours to start from scratch and watch the lectures.
IV-4 VFD Tubes and PT6312LQ Driver, Power, Etc - Page 1
Forum section: electronics / beginners

author: zcomputerwiz
author_rank: Newbie
timestamp: April 06, 2020, 06:01:42 pm
content: I'd like to build a retro style display for a prop. It doesn't have to show much, 4 characters. Will be using an Arduino for the MCU.IV-4 VFD tubes were ( relatively ) cheap, the PT6312LQ seemed to have all the features I want, as it is capable of driving 4x16 segments without anything special as far as I understand.I got a little ahead of myself and purchased parts, now I'm re-reading the datasheets and have some questions while things are still in shipping.It looks like the PT6312LQ has a maximum grid / segment voltage of -25v, if Vdd is 5v.Since the best case is 1/4 duty cycle with my configuration, and the IV-4 tubes are normally driven at 25v static or 50v multiplexed, will this make the tubes too dim to see?I'm also not sure how the power supplies for these will work, as I'm having a hard time finding isolated dc-dc converters.It is my understanding that if I would need -5v and +25v connected to the ground pin - and that this would most likely let the smoke out of the supplies if they are not isolated and connected to the same battery.My source was planned to be 2x10-12v 6000mah battery packs in parallel to run the display and the rest of the components.Would a simple solution be an isolated 5v supply for the logic side of the PT6312 and 6N137 opto coupler on the serial lines from the Arduino?

author: zcomputerwiz
author_rank: Newbie
timestamp: April 20, 2020, 10:58:34 pm
content: Have isolated DC/DC converter, optoisolator, filament driver, etc. Now just waiting on the VFD tubes.If it's too dim directly driven from the chip, I guess I'll use the grid outputs to run appropriate transistors or such to switch the higher voltage.
Ive desinged a new power supply, need feedback - Page 1
Forum section: electronics / beginners

author: little_carlos
author_rank: Regular Contributor
timestamp: April 30, 2014, 02:35:26 pm
content: Hi, a few weeks i was asking about a power supply that i had few problems, its already finished, little bit simple, but works perfect, here is a picNow, ive desinged a new power supply, single rail, same specs, but with automatic fan control and digital voltmeterhere is the circuitas you can see, in Q3, i have a "?", i need your help. for choosing a transistor for control of the fan, the opamp will send the voltage control to the base of the transistor, or should i use a n channel mosfet?if there's something to make better, any ideas or recomendations, i hope you can write them down, thanks for your time

author: Fank1
author_rank: Regular Contributor
timestamp: May 01, 2014, 12:40:16 am
content: Add some resistance for a minimum load to the output along with a capacitor.The circuit as shown should run the fan all of the time.You need to make a voltage divider and put it on the (-) side of the LM358 set its output to the value that will be generated by the LM 35 when you want the fan to come on.Put an N-Channel mosfet on the (-) side of the fan with the (+) side connected to 12 VDC.

author: kaindub
author_rank: Regular Contributor
timestamp: May 01, 2014, 01:18:59 am
content: Have a look at an LM317 datasheet. It will show you how to boost the output current of the LM317.Your circuit takes its feedback (resistor R2) before a diode (why the diode) and a transistor be junction. Both of these elements have a non linear relationship between voltage drop and current. Therefore the regulation of the supply will pretty poor (if regulation is what your are looking for.There is also no current limitingCopy the suggested LM317 designs and you'll get better regulation and some foldback current limitingRobert
DMHC3025LSD H-Bridge Question - Page 1
Forum section: electronics / beginners

author: mribble
author_rank: Regular Contributor
timestamp: July 31, 2018, 08:17:09 pm
content: I thought I understood h-bridge chips, but evidently I'm missing something with this chip so I need some help. Here is the datasheet for the chip I'm using (it's just 2 pmosfets and 2 nmosfets):https://www.mouser.com/datasheet/2/115/DMHC3025LSD-218720.pdfI'm powering this chip with 12V. Then to the 4 inputs on the hbridge I'm passing in P1G=0V, N1G=12V, P2G=0V, N2G=12V. The P pins are pmosfets. The N pins are nmosfets. So I thought this would effectively turn off all 4 mosfets, but I'm seeing an internal short in the chip.Can someone gently explain what I'm misunderstanding?Thanks in advance for the help!

author: voltsandjolts
author_rank: Unknown
timestamp: July 31, 2018, 09:38:48 pm
content: In simple terms for this device, the N-type mosfet is on when the gate is positive, the P-type is on when gate is at ground.I think you got N and P mixed up.

author: mribble
author_rank: Regular Contributor
timestamp: August 01, 2018, 03:49:05 pm
content: You are correct. That was my mistake. Thanks!
IXFH26N50 replacement - Page 1
Forum section: electronics / beginners

author: Sivand12
author_rank: Contributor
timestamp: November 18, 2014, 11:15:21 am
content: Hi, can i replace IXFH26N50 with IXFH26N50P? (i already buy early peace) i nead it fore o smps

author: Paul Price
author_rank: Super Contributor
timestamp: November 18, 2014, 04:58:35 pm
content: Check the datasheets for a match.

author: wraper
author_rank: Unknown
timestamp: November 18, 2014, 05:07:02 pm
content: You can use it. Compared datasheets and they are very similar, shouldn't be an issue.
Jacobian matrix and determinant question - Page 1
Forum section: electronics / beginners

author: MathWizard
author_rank: Super Contributor
timestamp: April 25, 2023, 02:39:57 pm
content: I was just reviewing change of coordinates/variables, and looking at this pdf, page 4https://www.stat.rice.edu/~dobelman/notes_papers/math/Jacobian.pdfWhy does XuUx + XvVx = 1, not 2 ? And the same if I multiply out det(J)det(Jinverse), there I get 0, not 1. Ok now I also get 2 there, but thats not 1And J*(Jinverse) would equal 2I, not IWhat am I mixing up or not remembering ?

author: jasonRF
author_rank: Regular Contributor
timestamp: April 26, 2023, 02:50:07 am
content: Unless you show your work we cannot know where you are going wrong. But for any matrix $$A$$ it is always true that a $$A A^{-1}=I$$, and $$det(A^{-1})=1/det(A)$$.

author: IanB
author_rank: Super Contributor
timestamp: April 26, 2023, 03:48:29 am
content: Quote from: MathWizard on April 25, 2023, 02:39:57 pmBecause, in general:$$\left(\frac{\partial x}{\partial u}\right)_v\left(\frac{\partial u}{\partial x}\right)_y\neq1$$QuoteYou are using calculators too much

author: MathWizard
author_rank: Super Contributor
timestamp: April 27, 2023, 06:28:09 am
content: No not using calc'sTo get zero = det(J)det(Jinv) = (XuYv-XvYu)(UxVy-VxUy)=.....And for the 1st term of that isn't it XuYvUxVy=XuUxYvVy=XxYy=1*12nd term-XuYvUyVx=-XuUyYvVx=-XyYx=-13rd term-XvYuUxVy=-XvVyYuUx=-XyYx=-14th termXvYuUyVx=XvVxYuUy=1and then 2-2=0

author: IanB
author_rank: Super Contributor
timestamp: April 27, 2023, 07:27:44 am
content: Read the post made by jasonRF again, and then read my post again, until you understand them. Also, re-read the PDF you linked, as it explains these things.For any invertible matrix J, it is a tautology that det(J)det(Jinverse) = 1. You can try this numerically with any non-singular J (or A, or Q) you care to construct. You are guaranteed to get 1 as the product if you do the calculations correctly.You cannot assume that XvYuUyVx = 1, since this is not, in general true, as per my earlier post.

author: MathWizard
author_rank: Super Contributor
timestamp: April 27, 2023, 09:27:53 am
content: Yes I know AAinv should be I when A is invertable, and I can see from examples what I'm doing with the deriv's is wrong. I'm doing some special case, and/or mixing up Einstein summation notation when contracting differential forms, when doing coorodinate transforms.

author: IanB
author_rank: Super Contributor
timestamp: April 28, 2023, 02:33:08 am
content: We can look at a simple linear example using some actual values:$$u=4x+5y$$ $$v=2x+3y$$Inverting this system gives:$$x=\textstyle{\frac{3}{2}}u-\textstyle{\frac{5}{2}}v$$ $$y=-u+2v$$The Jacobian matrix and its inverse become:$$J=\left[\begin{matrix}u_x&u_y\\v_x&v_y\\\end{matrix}\right]=\left[\begin{matrix}4&5\\2&3\\\end{matrix}\right]$$ $$J^{-1}=\left[\begin{matrix}x_u&x_v\\y_u&y_v\\\end{matrix}\right]=\left[\begin{matrix}\textstyle{\frac{3}{2}}&-\textstyle{\frac{5}{2}}\\-1&2\\\end{matrix}\right]$$If we then multiply the corresponding derivatives, we see the result is not 1:$$u_x x_u = \left( 4 \right) \left( \textstyle{\frac{3}{2}} \right) = 6$$
Jameco grab bag unknown parts. - Page 1
Forum section: electronics / beginners

author: registereduser
author_rank: Contributor
timestamp: October 24, 2023, 02:23:37 pm
content: Can anyone ID these components?http://sixfour.freeshell.org/stuff/The fifth one, that is just a green dot on top, not an adjustment.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: October 24, 2023, 03:05:07 pm
content: The first five are probably all capacitors, though the second may be a transient suppressor or other part. The last picture is not clear enough to be sure, but looks like a pot.You might want to look into buying one of the $20 dollar transistor checker of the type discussed in the very long thread here:https://www.eevblog.com/forum/testgear/tc1-lcr-meter-transistor-tester-fix/msg1622248/#msg1622248

author: Ian.M
author_rank: Super Contributor
timestamp: October 24, 2023, 03:24:38 pm
content: I can categorically state that 210810, 210826 and 210835 are *NOT* capacitors, but due to the rickroll am not going to help you identify them.

author: Grandchuck
author_rank: Super Contributor
timestamp: October 24, 2023, 04:47:26 pm
content: spark gap capacitor and silver mica capacitor and ?

author: gnif
author_rank: Unknown
timestamp: October 24, 2023, 04:48:12 pm
content: I will state one is a NTC Thermistor, but which one I wont say, again due to the rickroll!

author: Uunoctium
author_rank: Frequent Contributor
timestamp: October 24, 2023, 05:24:00 pm
content: 1 is a Polyswitch!

author: wasedadoc
author_rank: Super Contributor
timestamp: October 24, 2023, 06:07:54 pm
content: The 5th one has 3 legs. More likely to be a semiconductor device. Better photo needed.

author: registereduser
author_rank: Contributor
timestamp: October 24, 2023, 06:15:49 pm
content: Quote from: wasedadoc on October 24, 2023, 06:07:54 pmI'll try to put up a better pic later. It looks like a transistor, but there is not rounded back, both sides are flat. That is a green dot on top, no other markings.

author: themadhippy
author_rank: Super Contributor
timestamp: October 24, 2023, 06:22:45 pm
content: Quotemeans nothing, transistors come in lots of shapes and sizes

author: wasedadoc
author_rank: Super Contributor
timestamp: October 24, 2023, 06:26:00 pm
content: Quote from: Uunoctium on October 24, 2023, 05:24:00 pmNo it is not.
Jaycar MP3 Recorder/Player Board - Page 1
Forum section: electronics / beginners

author: @rt
author_rank: Super Contributor
timestamp: September 10, 2016, 08:55:17 am
content: Hi GuysI’ve got one of these so called MP3 Recorder boards from Jaycar, but the chip also happens to be a decoder.In fact, I don’t think it can encode to MP3 at all!http://www.jaycar.com.au/arduino-compatible-mp3-recording-module/p/XC4516The board overall wants a 5V supply, although the VS1003 decoder chip wants a 2.7 V supply for it’s core,and can take up to 3.6V supply for it’s IO logic. The 2.7 Volt supply regulation is on the board itself,as I suppose is also a 3.x V supply for it’s logic.What I’m wondering is why this would be sold with Arduino shields and the like,when it’s IO is connected straight to the pins on the chip, and should be 3.6 Volts max.What sort of Arduino board would supply the 5V power, and talk through the IO at 3.6 Volts?Also if you’re up for a laugh check out the data sheet of the module on Jaycar's site (not the VS1003 chip itself).Cheers

author: amyk
author_rank: Super Contributor
timestamp: September 10, 2016, 02:51:22 pm
content: Wow that's ridiculously overpriced. A complete MP3 player/recorder costs less than that:http://www.dx.com/c/consumer-electronics-199/portable-audio-video-180/mp3-players-101I'm not even sure why the VS1003 is still in production and apparently popular in certain communities. A general-purpose MCU/DSP is powerful enough to decode MP3 these days, plus do a lot of other things.

author: @rt
author_rank: Super Contributor
timestamp: September 11, 2016, 01:53:39 am
content: That doesn’t address the question, but yes, even the same retailer sells cheaper mp3 players.I have two of the bare chips on the way from eBay for just under $7 each.A software mp3 player isn’t suitable for the project at all.I’m using a dsPic that is also running a graphics library, and I don’t want the overhead on it.
JBC 2245 and T245 vs. T12 - Page 1
Forum section: electronics / beginners

author: smile
author_rank: Regular Contributor
timestamp: June 28, 2018, 04:09:53 pm
content: Hello, how does the JBC 2245 and T245 from chinahttps://www.aliexpress.com/store/product/C245-Series-C2245-032-Soldering-Tip-for-T245-Handpieces-2245-Soldering-Iron/1162116_32853804513.html?spm=2114.12010615.8148356.2.53191a87LAekqfmatch to T12 tips from china?The T12 is way cheaper and I don't read many complaints. The new stations support calibration for every soldering tip.Just want to make sure I buy best deal.
JBC 2245 and T245 - Page 1
Forum section: electronics / beginners

author: cavlovic
author_rank: Contributor
timestamp: October 14, 2013, 07:00:46 pm
content: Can someone tell me if JBC 2245 and T245 soldering handles take same soldering tips? I am looking to get used JBC AD2700 od AD2200 but I'm not sure if tips are interchangeable. Or if I need new handle in future, can I just get a new T245 and use with older AD systems?

author: nanofrog
author_rank: Super Contributor
timestamp: October 14, 2013, 08:25:28 pm
content: Yes.

author: mikgntl-2013
author_rank: Regular Contributor
timestamp: October 14, 2013, 08:45:04 pm
content: T245-A and 2245 are interchangeable, just like C245 and older cartridges.You can also use precision handpiece (T210-A) and related cartridges.

author: cavlovic
author_rank: Contributor
timestamp: October 15, 2013, 11:19:23 am
content: Quote from: mikgntl-2013 on October 14, 2013, 08:45:04 pmNice, thank you!
JBC Compact Stations vs Modular System - Page 1
Forum section: electronics / beginners

author: ohms law
author_rank: Contributor
timestamp: February 03, 2021, 10:31:29 pm
content: Hi,I am looking for some advice on if I should get the JBC Compact Stations - T245 & Micro Tweezers or the Modular system with the T245 and Micro Tweezers?I am looking for people who have experience with both of them pro's and con's?I don't want the other attachments at the moment which the modular system offers - just wanting to know which is the better of the 2 options? there is an increase in cost if one does the modular systemPS: Not wanting any other brand or make or DIY solution (Already have a Hakko & have ordered a Unisolder kit which is on it's way)thanks in advance

author: peter2
author_rank: Contributor
timestamp: February 14, 2021, 07:51:00 pm
content: i have the modular system.tweezer am120 are very nice ,and it is adjustable.it is very important that you have a 4 handel station,because you can handle all the pieces in the future from jbc.the heat transfer is very good,much better than weller .i own a wmd-3m for many jears,but active tip are nessesary on the market .jbc make realy good stuff.the tips are not expensif on ebay,com and cost about 15 euro p/s.the weller have expensiv stuff,about 250 euro for one piece of handel,and jbc have handel for about 80 euro.now the tweezers are very responsif,and good to handle.they have tips for plcc chips to desoldeer ,it is realy nice to have it,one time to desoldeer plcc chipsTip numbers are c245223 or c245224 for ther t245 handel ,realy nice,weller have nothing like that.Tips,jbc can make it for you.iam not from jbc,but modulair line are very nice.Only the tips ,are very fast oxidation,but not for the earia for the solder.weller have tips witch better coating on it,but the heat transfer are not good(not activ technoligy).so i can say buy always a system witch active tip technology,it is very important for smd.I repair ,screens and audio equipment.the weller system witch active tips are also very expensif,and 10 tips only to thoice.i hope ,go for heat transfer/time it is very important.test one system always,and you can feel the difference
JBC soldering stations and power input 50/60 Hz - Page 1
Forum section: electronics / beginners

author: ffloz
author_rank: Newbie
timestamp: May 23, 2014, 08:23:40 pm
content: Does anyone have any knowledge about power supply in modern JBC soldering stations?Currently I am looking to buy one. And able to do it only in US (only 120V versions in stock)but power outlet in my country will provide 50 Hz.Although label on station itself said120V 60Hz, technical specifications in instruction manual tells:120V 50/60Hz(http://www.jbctools.com/pdf/JT_B_MANUAL.pdf)Does it mean that I will be able to connect it to power supply both with120V 50Hzand120V 60Hzwithout harm?Thank you.

author: Paul Price
author_rank: Super Contributor
timestamp: May 23, 2014, 09:13:44 pm
content: yes

author: Dago
author_rank: Frequent Contributor
timestamp: May 24, 2014, 06:23:13 am
content: Yup, it has just a regular transformer inside so it will work fine with 50 or 60 Hz.

author: ffloz
author_rank: Newbie
timestamp: May 24, 2014, 08:11:19 am
content: Great!

author: nanofrog
author_rank: Super Contributor
timestamp: May 24, 2014, 05:10:08 pm
content: A US company,janelonline, also sells the 230V models (they sell internationally), and their prices are good. Might be worth looking into, as it would eliminate the need for a stepdown transformer.

author: ffloz
author_rank: Newbie
timestamp: May 25, 2014, 05:17:41 am
content: Thank you for the clue.At this time, quantity in stock for all 230v stations is 0.But I shall ask them.
JBC Soldering Videos  - Page 1
Forum section: electronics / beginners

author: acarpenter
author_rank: Contributor
timestamp: January 07, 2014, 10:51:27 am
content: removed.

author: ampdoctor
author_rank: Frequent Contributor
timestamp: January 07, 2014, 01:16:13 pm
content: Hi Andrew;Watched the videos and they look really nice visually. You asked for critiques so here's my take on them. I'm also going to nit pick a little because I'm not doing you any favors by telling you what I think you did right. You get better and improve your craft by being told what might be wrong, so here it goes.First off I understand what you're trying to do, or at least I think I do. You're trying to work off the idea of modern art and subtle elegance of the modern design? Here's the thing, keep in mind your target audience. You're not selling to members of the Cannes Film festival or attendees of art gallery showings. You're selling to engineers and corporations. And yes you are always selling something to somebody!The thing that jumps out is the hand held look. The slight lack of steadiness in the shots gives it a slightly awkward feel that's a little uncomfortable. Also between the speed of the pans and zooms and music, the combination makes it feel like it's dragging a little. There's also a few shots that seem a bit out of place, such as the inset frame at 10 seconds and the circuit board. They don't seem to fit in with the rest of the video.Now the most important part, there's not a lot there that says "damn I got to get me a JBC!" It's telling me wow the person who created this is trying to show off his technical skills and artistic side of film making. Problem is that there's a whole lot of people that are technically skilled and artistic filmmakers out there. What you want is to create something that tells prospective clients "damn, this guy knows how to sell my stuff!!!!" And THAT is what's going to set you apart from the rest of the herd. Give me a reason to crack open my wallet and pay 50% more for a JBC than one of the other brands!So those are my initial impressions. Take what you think is useful and discard what you think is garbage.

author: acarpenter
author_rank: Contributor
timestamp: January 07, 2014, 01:26:39 pm
content: Thanks
JBC T245 vs T210 pinout - Page 1
Forum section: electronics / beginners

author: SurprisingRice
author_rank: Newbie
timestamp: November 21, 2021, 07:09:24 pm
content: Hi,I recently bought this item.https://www.unionrepair.com/tec-extension-module-with-holder-for-jbc-soldering-station.htmlIts a extension unit for a standard JCB station. It allows the user to have two irons from one station. In my case, I have a T245 tip as my main iron, and i wanted a T210 iron as my secondary. I did not read the little "NOTICE" before i bought the unit and realised too late that I cannot use a T245 tip with a T210 tip in this TEC Extension unit.When I do, the T210 tip works fine. but the T245 tip doesn't heat up, when the station says its 345 degrees, aswell as randomly saying there's a ground fuse error.So I got to thinking, the only difference between both tips is that pin 6 (the center pin) on the T245 iron doesn't exist, but on the T210 iron it does exist. Could I just plug that pin 6 up and insulate it?https://imgur.com/a/AOSC6J5To those of you who made their own JBC iron controllers, could you comment on what I could do here regarding connector modification, or TEC extension module modification?Thanks,Greg

author: SurprisingRice
author_rank: Newbie
timestamp: November 22, 2021, 03:18:40 pm
content: I figured it out. pin 6 indicates to the station that the tool needs 12v not 24.I will insulate pin 6, and use a buck converter to turn 24v into 12v from the TEC Extension for the t210 handle.

author: Markll
author_rank: Newbie
timestamp: February 19, 2022, 08:22:50 pm
content: Hi,same problem to solve over here. I also haven't read the "notice"...Does it work with the buck converter?Kind regards,Markus
Jccon caps - Page 1
Forum section: electronics / beginners

author: jeffjmr
author_rank: Regular Contributor
timestamp: April 15, 2023, 05:51:38 pm
content: Any experience or opinions on the chinese Jccon electrolytics?20000 to 25000uf in particular.Thanks,Jeff

author: beatman
author_rank: Regular Contributor
timestamp: April 16, 2023, 05:13:13 am
content: found some on pro audio and lighting units. i replace the next moment.my opinion is jccon is a crap the manufactures search the last hole to found components for save money.and unfortunatly we don't know what quality all this smd tiny things is.
JCD 8898 soldering iron not hot enough - Page 1
Forum section: electronics / beginners

author: Meshary
author_rank: Newbie
timestamp: February 09, 2023, 08:38:25 am
content: hi, i bought this 2in1 soldering station and the heat gun works fine except the soldering iron, i tried from 300c up to 500c with the calibration setting to +99 but it doesn't seem to be hot enough to melt any soldering tin that i have tried. i thought the iron was the problem so i ordered a replacement and today it arrived and tested and it has the same problem.do you have any idea what is the issue?

author: EPAIII
author_rank: Super Contributor
timestamp: February 09, 2023, 09:40:12 am
content: It could be many things.Is the tip getting warmer at all or does it remain at room temperature?Are you using a good brand of solder? Have you used it with another iron and know it is OK?Is the tip properly tinned? I like the metal ribbon style cleaners. A hot tip can be plunged into them two or four times to clean it. Then, quickly dip it in a paste flux and apply solder to it immediately. The solder should melt immediately and coat/adhere to the tip.Do you have any way of actually checking the temperature? 600°F/315°C or even somewhat less should be enough to melt most solders. But the needed temperature can vary, particularly with the lead free solders. Check the temperature needed for the solder you are using.Since the iron itself is apparently removable, you can check the heating element in it with a VOM. You should get a resistance reading across the wires to that element: not open or shorted. Making a rough guess here as to what that resistance may be and with some assumptions that may not be correct:Assumptions:60 Watt iron230 V line Voltage is used at the heaterR = V^2 / PR = 882 OhmsBut this could vary a lot and if it is a low Voltage heater element then the resistance will be a lot less.I don't know if it would work with the iron disconnected, but you could try to measure the Voltage that the unit is sending to the iron. Actually it would be best to measure it with the iron connected. If there is no Voltage there, then the problem is in the control unit and not the iron.It may help if you could post a photo of it.

author: Meshary
author_rank: Newbie
timestamp: February 09, 2023, 02:25:04 pm
content: I tested it the way you said from the heating element and the Voltage is 0 then it jumps to 40v or higher for a moment then goes back to 0Here is a picture

author: Meshary
author_rank: Newbie
timestamp: February 09, 2023, 02:33:27 pm
content: I replied with the photo but here is a videohttps://www.kapwing.com/videos/63e5040a0f2ea300174692e8

author: Meshary
author_rank: Newbie
timestamp: February 09, 2023, 02:35:55 pm
content: Quote from: EPAIII on February 09, 2023, 09:40:12 amStill figuring out how to reply to you and not the topic lol

author: Meshary
author_rank: Newbie
timestamp: February 12, 2023, 07:12:03 am
content: I think the control unit is faulty is there anyway to fix it?
Jdm11-6h 24 Vic pulse counter help please - Page 1
Forum section: electronics / beginners

author: Malachi
author_rank: Newbie
timestamp: December 31, 2015, 12:11:06 am
content: Hello, I have a noob question if someone has the patience to help. I bought this jdm11-6h counter from eBay with some other odds and ends to construct a pickup winder for another hobby I have, guitars. I was successful in testing the motor and speed + direction control but the the counter or me, is flawed. I verified the supply doc voltage to the correct terminals 3 & 4 and manually closed the 1 & 2 terminals and expected the 6 digit display to roll from the he zero,s the lad was displaying to a 000001 but that never happened. Though the rice paper instructions that came with the counter were written in what I concluded to be Mandarin or another dialect of the source country, I thought I could properly identify the diagram of 4 terminals, 1 & 2 with a symbol of a no switch and 3 & 4 with a + and - that I understood to be supply voltage. The lcd did present me with bright glowing digits but the unit did not waiver in its determination to remain 000000. So using my best Sherlock skills, I have deducted that I am either a complete idiot or the unit malfunctions. Can someone help me decide which one is accurate please?