hybridfree/eevblog-posts huggingface dataset:
WS2812B library support in atmel studio - Page 1
Forum section: electronics / beginners

author: katlin
author_rank: Newbie
timestamp: February 23, 2021, 04:05:38 pm
content: Hi all,I am trying to work with WS2812B RGB LED(GPIO Controlled) + SAML21 in Atmel studio.Board: SAML21 Xplained ProSensor: WS2812B RGB LEDIDE: Atmel studioLooking for WS2812B Library which supports ATMEL Studio. I could not find any reference library online.How do I do this? If anyone can help, that would be great.I have tried to port the Arduino library below libraries. But no outcome.*https://github.com/adafruit/Adafruit_NeoPixel%C2%A0*https://github.com/kitesurfer1404/WS2812FXThanks in Advance.

author: sigma_xi
author_rank: Contributor
timestamp: May 29, 2021, 07:07:38 am
content: I don't know about library support for Atmel studio. However, you can write your own driver using the SAML21's DMA capabilities. I did the same thing using an STM32 with DMA and Timer in PWM mode, but it can also be done via SPI.Some implementations of the DMA+Timer solution can be found online, seehttps://github.com/benwilliam/equinox_clockfor example.The basic workflow is:1) Initialize Peripherals (GPIO, DMA for memory->peripheral transfer, Timer in PWM mode but disabled)2) Have your colour data stored in memory.3) Convert colour data to Timer compare values according to the WS2812B's timing requirements for 0/1 bit.4) Start the transfer via DMA (enable DMA, enable timer). Now the DMA controller automatically streams the converted colour data to the Timer. At the end of the transfer: disable timer.(An important note: You must ensure that the timer compare value is updated by DMA before the next PWM cycle starts, otherwise it won't work. For the STM32 this is done by enabling OC preload)
WSNDEMO Application- Coordinator send data to Router - Page 1
Forum section: electronics / beginners

author: Peili
author_rank: Regular Contributor
timestamp: March 26, 2018, 08:04:53 am
content: i downloaded and implemented wsndemo app from bitcloud. The app works fine and i'm able to send data from coordinator to router.. Now i want to build an application in such a way that when coordinator sends the string "request" to router it should reply with the string "reply".In WSNDemo code where can I include the comparison of string and return the response string.can anyone help me to solve this?
WTB 16-bit DAC with I2C interface, good ol' DIL package - Page 1
Forum section: electronics / beginners

author: Aeternam
author_rank: Unknown
timestamp: November 03, 2016, 04:10:34 pm
content: Hey gang,I suppose the title says it all. I'm looking for an I2C controllable 16-bit DAC. I found a ton on Mouser, but they're all in SMT packages which I'm not too hot about. I'd prefer a through hole model. You'd think such a thing existed, but so far, no cigarPrice is not an issue, it's for a personal project. As long as it's accurate. Vout(max) should be 5V and it should take an external VREF.Does anyone have a tip? (apart from looking at socket adapters)

author: Kalvin
author_rank: Super Contributor
timestamp: November 03, 2016, 04:30:41 pm
content: An adapter PCB SMT-to-through-hole? Shouldn't be too difficult to solder.

author: rob77
author_rank: Super Contributor
timestamp: November 03, 2016, 04:41:01 pm
content: @ farnell filtering among DACs 16 bit + DIP package yields 24 products.

author: Aeternam
author_rank: Unknown
timestamp: November 03, 2016, 04:59:58 pm
content: Quote from: rob77 on November 03, 2016, 04:41:01 pmNone of which support I2C... See my problem?

author: kripton2035
author_rank: Super Contributor
timestamp: November 03, 2016, 06:26:49 pm
content: ads1115 already mounted on a breakboardhttp://www.ebay.com/itm/ADS1115-Module-4-Channel-16-Bit-I2C-ADC-with-Pro-Gain-Amplifier-For-Arduino-New-/142164864402

author: matkar
author_rank: Regular Contributor
timestamp: November 03, 2016, 08:50:15 pm
content: Would this fit your requirements?http://www.ebay.com/itm/2pcs-TDA1543-Dual-16-bit-DAC-Chip-DIP-8-/180709030525?hash=item2a1318fa7d:g:8MEAAOxypthRvUaY

author: rob77
author_rank: Super Contributor
timestamp: November 04, 2016, 09:49:30 am
content: Quote from: Aeternam on November 03, 2016, 04:59:58 pmconsidering the price of those DACs it's n ot a problem to add a small micro to do the translation if I2C is really a must.btw.. what's the application ? why it has to be I2C ?

author: julian1
author_rank: Frequent Contributor
timestamp: November 04, 2016, 10:39:04 pm
content: Boards like these, + $60 hotair gun, + solder paste.https://www.google.com/search?newwindow=1&biw=870&bih=582&tbm=isch&sa=1&q=soic+board+&oq=soic+board+It's really easy - and will open up a lot of choice (and price options) for op-amps, comparators, ADCs etc.It also means you don't need two separate inventories (SMT and DIP) for the same jelly-bean IC components.

author: gamalot
author_rank: Super Contributor
timestamp: November 04, 2016, 10:54:43 pm
content: Quote from: kripton2035 on November 03, 2016, 06:26:49 pmI think what he wants is DAC not ADC.

author: kripton2035
author_rank: Super Contributor
timestamp: November 05, 2016, 06:46:33 am
content: oups !
WXA Capacitor Designation - Page 1
Forum section: electronics / beginners

author: metrologist
author_rank: Super Contributor
timestamp: May 04, 2022, 07:10:15 pm
content: Is WXA just Rubicon branding or does it mean anything? Google insists I need info on waxing my Rubicon jeep when searching for WXA capacitor types.I ordered a pack of 1000uF 35V WXA Rubicon caps to replace some bulging ones in my cheap inverter, at the DC voltage input side of the transformers is where I think they're connected. The only concern I have bout these caps is the image made them look about half the height as the ones I'm replacing, and the diameter appears (maybe as an illusion), only slightly larger. If they are much larger at all, they won't fit as now pairs are touching. But if they are just shorter, how do they achieve the same capacitance value?I am thinking automotive grade is better than something like green Panasonic generic caps, yes?

author: metrologist
author_rank: Super Contributor
timestamp: May 04, 2022, 10:10:51 pm
content: After finding this it looks like these caps nick none of the boxes I might care about, like for High Ripple, Long life, Low Z Low ESRhttps://www.rubycon.co.jp/en/products/al-radial-lead/series
Wyse Wy-30 keyboard mod - Page 1
Forum section: electronics / beginners

author: k5sm
author_rank: Newbie
timestamp: September 24, 2019, 07:06:33 am
content: Hello allI am looking for some help doing a USB mod to this WYSE WY-30 keyboard....does anybody have any advice?

author: Dave
author_rank: Super Contributor
timestamp: September 24, 2019, 11:35:40 am
content: Figure out how this thing transmits the key codes and then use a microcontroller that reads the codes and sends them to the computer over HID.

author: Black Phoenix
author_rank: Super Contributor
timestamp: September 24, 2019, 11:57:04 am
content: From the keyboards geek for you:https://geekhack.org/index.php?topic=52597.0

author: k5sm
author_rank: Newbie
timestamp: September 24, 2019, 01:33:19 pm
content: I did find that and have the ATmega on the way. Have never used a microcontroller before though.

author: FreddieChopin
author_rank: Regular Contributor
timestamp: September 25, 2019, 08:35:40 am
content: Quote from: k5sm on September 24, 2019, 01:33:19 pmThen remember not to mess up your fuse bits as that can (almost) brick AVRs.Also, if youre new to AVR MCUs then maybe tryBASCOM. You'll get much help for it athttp://elektroda.pl

author: dave j
author_rank: Regular Contributor
timestamp: September 25, 2019, 12:02:00 pm
content: Quote from: k5sm on September 24, 2019, 01:33:19 pmIt would be worth you looking at the Arduino stuff which has libraries for implementing USB keyboards. Even if you don't use it directly, looking at how they implement their Keyboard/USB stuff to will you some idea of how to program the MCU directly.
x VDC @ y A - Page 1
Forum section: electronics / beginners

author: ABCD
author_rank: Contributor
timestamp: June 27, 2011, 02:36:33 am
content: When looking at kits, I see some say something like 12VDC @ 15mA. So if I have a power supply that outputs 12VDC but at 1A, then this is no good. How would I reduce the current, since if I did, I'd also be reducing the voltage.A kit built power supply I was looking at, for example, can output from +/- 1.35 to +/- 15 VDC @ 1A. So in a circuit that I see as taking 12VDC @15mA, this supply would give too much current, right? Or am I looking at this the wrong way?

author: ivan747
author_rank: Super Contributor
timestamp: June 27, 2011, 02:42:38 am
content: Quote from: ABCD on June 27, 2011, 02:36:33 amNo. Your power supply will just keep the voltage. The current flowing through the circuit will be determined by the kit. Go and Google for Ohm's law, you will understand the relationship between voltage, current and the load (resistance).

author: w2aew
author_rank: Super Contributor
timestamp: June 27, 2011, 02:47:43 am
content: When looking at the spec for a kit, it tells you the REQUIRED supply voltage, and the current that IT will DRAW from that supply voltage.When looking at a spec for a power supply, it will tell you what voltage it can produce, and the MAXIMUM current it can provide at that voltage.The circuit will draw what it needs. So, if your circuit only needs 15mA and your supply is capable of 1A - you're golden. If your kit needs 500mA and your supply can only do 200mA, then you have problem (not enough capacity in your supply).

author: Wartex
author_rank: Frequent Contributor
timestamp: June 27, 2011, 03:44:28 am
content: Quote from: ABCD on June 27, 2011, 02:36:33 amCurrent is a consequence of voltage, not other way around. Power supply provides 12v DC and can provide UP TO 1A, but the actual current (15 mA) will depend on the resistance of your device, which in this case is ~800 Ohms (12/0.015 = 800).

author: Mechatrommer
author_rank: Super Contributor
timestamp: June 27, 2011, 04:38:18 am
content: Quote from: ABCD on June 27, 2011, 02:36:33 amwhats your purpose?

author: ABCD
author_rank: Contributor
timestamp: June 28, 2011, 12:09:36 am
content: Quote from: w2aew on June 27, 2011, 02:47:43 amThat's what I thought, that the circuit is using what it needs, so I guess I was reading it the wrong way -- the way you put it made it crystal clear. Thanks.

author: wardenclyffe
author_rank: Contributor
timestamp: June 29, 2011, 03:49:32 pm
content: If you use a supply capable of 1A on a kit that only requires 15mA it will work, but you may have some voltage regulation issues because of the light loads. Also, the supply will likely be operating at its lowest efficiency. These may not be important for the kit to function....just something to think about.
x1 and x2 capacitors - Page 1
Forum section: electronics / beginners

author: alireza7
author_rank: Regular Contributor
timestamp: August 17, 2017, 09:06:24 am
content: hii'm working on a switching power supply and i was searching about capacitors and i faced to x1 and x2 type capacitors.can you tell me anything about these types and their characteristics?

author: Toasty
author_rank: Regular Contributor
timestamp: August 17, 2017, 09:29:07 am
content: AC Safety capacitors."There are two major types of interference suppression/AC line filter safety capacitors, type X and type Y. The function of these capacitors is to protect against surges and transients, as well as providing EMI filtering . Safety capacitors are circuit-specific, and serve to protect the circuit and the user from high voltage surges by shunting the impulse energy to ground. One common cause of such surges is lightning strikes."(1)Xcaps are used ACROSS the mains. X capacitors mayNOTbe used from mains to ground or casing because if an X cap FAILS, the metal frame/housing may become energized and pose an electrocution hazard. If installed as designed and it fails, it will (should) blow the equipment fuse.Ycaps are used FROM mains to frame/ground. Y capacitors can also be used as an X-style cap across the mains. They are engineered to fail OPEN. However, if they fail shorted, they can pose an electrocution hazard if the equipment ground is lost.Rated impulse voltages:X1- 4kV -X2- 2.5kVY1- 8kV -Y2- 4KvT(1) - Tecate Group - AC Safety Capacitors

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: August 17, 2017, 11:11:11 am
content: Glad Toasty cleared up the confusion.
X1 probes - Page 1
Forum section: electronics / beginners

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: April 30, 2018, 05:01:28 pm
content: I use probes X1 and not x10 since my rigol ds1054z for a problem that I can not solve still takes about ten minutes to compensate them here I explain it to the problemhttps://www.eevblog.com/forum/repair/rigol-] https://www.eevblog.com/forum/repair/rigol-ds1054z-109465 / [/ url].As I only use it in prudent arduino and electronic projects, I do not measure voltages higher than 24Volt and frequencies of 28 MHz, my question will bring problems to the equipment and as long as it does not exceed the 150 valt and the 35MHz that are the limits for the X1 probes, that comparing X1 and X10 I do not see differences in both the graphics and the values displayed on the screen.

author: Old Printer
author_rank: Frequent Contributor
timestamp: April 30, 2018, 05:57:35 pm
content: As an answer from a beginner, as I understand it minimizing the signal to the scope is only part, and maybe not the major part of the reason to use a 10X probe. A 10X probe has a much smaller chance of affecting the circuit under test, and possible changing the way that circuit operates. This is an excellent tutorial video by W2AEW (Alan Wolke) on the subject.

author: David Hess
author_rank: Super Contributor
timestamp: April 30, 2018, 08:02:38 pm
content: Even at low frequencies and voltages, you may still want to use a x10 instead of x1 probe because the x10 probe has lower input capacitance and higher input resistance.
X10 oscilloscope probe - Page 1
Forum section: electronics / beginners

author: blackjames
author_rank: Regular Contributor
timestamp: July 04, 2012, 12:23:07 pm
content: I just got a analog oscilloscope. But what does the x10 on the probe mean?

author: Rerouter
author_rank: Super Contributor
timestamp: July 04, 2012, 12:30:00 pm
content: it attenuates/divides your input signal by 10, so if you hold the tip to 5V while using an x10 probe your oscilloscope will measure 0.5V

author: digsys
author_rank: Unknown
timestamp: July 04, 2012, 12:51:50 pm
content: QuoteThe HM208 is also Digital, you should find a A/D button. Switching to X10 also increases the input Impedance by 10X,to 10M I think.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: August 14, 2013, 03:42:46 am
content: display single amplitude = (input signal amplitude) / 10
X2 class filter Caps climate categories - Page 1
Forum section: electronics / beginners

author: Deathwish
author_rank: Unknown
timestamp: November 12, 2015, 02:53:57 am
content: I have never actually in all my years given any thought to this marking on such Caps. Can someone explain in what they are related too with reference to what climate.Climatic Category 40/110/56

author: Deathwish
author_rank: Unknown
timestamp: November 12, 2015, 03:22:06 am
content: Ok, I found it at last. so it merely means that the temperature range and humidity class is from -40 to +110 Degrees C , 56 meaning the steady state humidity test should take 56 days. So I guess I could use one of 40/110/21 if I wanted without to many problems as a short stop.
x86 industrial motherboard with unknown connector - Page 1
Forum section: electronics / beginners

author: crazy_driver
author_rank: Contributor
timestamp: July 28, 2019, 09:12:14 pm
content: Hi, i have this motherboard on my wheel balancer. SECCO Italy CS478 REVBGeode 200mhz 8Mb sdramAll i can find in google is that it is a DIN 41612.https://www.conrad.com/p/assmann-wsw-a-cf96abct-spring-pin-design-c-straight-number-of-pins-96-a-b-c-742287I am afraid that the motherboard will die again (already did twice)Is it possible to adapt this pinout to a isa or pci to use on a more modern motherboard?https://www.amd.com/system/files/TechDocs/5530a_db.pdf

author: amyk
author_rank: Super Contributor
timestamp: July 29, 2019, 01:22:05 am
content: Figure out why it's dying first...

author: Per Hansson
author_rank: Unknown
timestamp: July 29, 2019, 06:33:20 am
content: https://en.wikipedia.org/wiki/DIN_41612Often used in what is called the European industrial connector.Many times it is just a standard PC/104 interface in a special connector.For being mounted in a 19" rack...

author: crazy_driver
author_rank: Contributor
timestamp: July 29, 2019, 08:48:50 am
content: it died because of memory, i think the onbord 8Mb are not ok so the first time i used a 32mb dimm and it worked for a little bit.After that i even tryed to reflow the grafic chip but for nothing, i found another 64mb dimm and it works again.i saw many boards with the 104 conector it would be a lot better to find than this.

author: amyk
author_rank: Super Contributor
timestamp: July 29, 2019, 11:41:34 am
content: Quote from: crazy_driver on July 29, 2019, 08:48:50 amCheck the caps and especially the stability of the RAM supply voltage. They don't just die for no reason.

author: crazy_driver
author_rank: Contributor
timestamp: August 27, 2019, 09:17:04 pm
content: the caps look fine and i have 3.39v on the 3.3v rail.What i see now is that the onboard memory is not working, only the 64mb that i added.
xbee 2 alternative - Page 1
Forum section: electronics / beginners

author: Isaac
author_rank: Contributor
timestamp: November 29, 2013, 05:17:54 pm
content: Hi,I'm thinking of using the xbee 2 series radios on a project/product for home automation. The main reason being that zigbee is a widely used standard and it's free, the oposite of z-wave that you have to pay loads of money to design products for their standard (also you are limited with just a few supliers os the hardware needed). My initial choice was to use xbee 2 series modules because they are very easy to use with any MCU since it has a very simple communication protocol between the radio and the MCU. The problem is that those things are very expensive and just one of those is more than a third of the BOM's cost in prototyping quantities. Well, searching on Digikey and other suppliers, it seems that the xbees don't have any price break for volume (just $17.5). It's not hard to conclude that the final model of my project/product would have a BOM which 90% of the cost would be just for the Xbee. Does someone knows any substitute for the Xbee radios that has all the features for zigbee protocol, including mesh routing buit-in as well as ease of use?Thanks.

author: Isaac
author_rank: Contributor
timestamp: November 29, 2013, 06:18:45 pm
content: At least, if not so plug and play, is there some firmware available on the net that does mesh routing on zigbee pro standard...

author: Maxlor
author_rank: Frequent Contributor
timestamp: November 29, 2013, 10:09:03 pm
content: I've recently found myself investigating a similar problem. The cheapest option for doing wireless MCU communication was the MRF24J40 chip from Microchip, and theMRF24J40MAmodule (which includes chip, antenna and the passive components to make it work). Not the most efficient chip as far as power usage, but the cheapest by far at $9.The hardware by itself is a 802.15.4 module (which is not exactly Zigbee, but the protocol layer underneath it and a number of similar protocols.) I think Microchip offer both a MiWi as well as Zigbee stack for it for free, if you use a PIC controller. Can't really say how easy the software is to use, since for my project it was enough to just use bare 802.15.4 messages.

author: Isaac
author_rank: Contributor
timestamp: November 30, 2013, 04:09:14 am
content: I looked for this MRF24J40 from Microship. I gave up because I could not find any info about how to get protocol layers into my application without writing the protocol from scratch, which is time consuming and really really hard... The protocol stack layer for the Zigbee Pro is not for free...http://www.microchip.com/pagehandler/en-us/technology/personalareanetworks/technology/zigbeesmartenergy.htmlOn the other hand, MiWi could be what i was looking for, maybe, since it's free and has no royalties...http://mobiledevdesign.com/technologies/zigbee-protocol-platform-offers-total-solution
Xbee antenna; outside box - Page 1
Forum section: electronics / beginners

author: A2
author_rank: Contributor
timestamp: August 15, 2014, 11:44:30 am
content: I have made a board on which xbee is connected. it communicates with another xbee, 3meters away from it.Now I have to seal the box. box is made of delrin. I have left small opening from where antenna can come outside. I have to sela the box, since weather is harsh, low as -10C.I am using xbee with wire antenna:http://www.digikey.com/product-detail/en/XB24-AWI-001/XB24-AWI-001-ND/9359651. I will fill entire circuit with potting material to make it weather proof. My question is how much antenna height should I keep ouside the box.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: August 15, 2014, 12:10:20 pm
content: Zigbee at 3m should be no problem. Probably be hard to stop in fact.Delrin should be transparent to the radio signal so you could keep the antenna completely inside the box if it fits.If you have a box that it IP rated you wont need potting mix. In other words it needs a soft gasket.Some boxes will flex in the temperature changes. Make sure the seal stays intact throughout your temperature range.Avoid the potting mix if possible, especially on hardware without much testing. Once the hardware is proven you can pot if you want as it does help with vibration as well as moisture.
XBee Antenna - Page 1
Forum section: electronics / beginners

author: ipek.grgc
author_rank: Contributor
timestamp: June 12, 2020, 04:23:57 pm
content: Hello,I am trying to choose a correct antenna for my XBee 3 Pro 802.15.4 module. I want to achieve the specified 3.2km range in a rural area under minimum local interference conditions. I was checking this page:https://www.digi.com/resources/documentation/Digidocs/90000991/reference/r_antennas_xb_fcc.htmto figure out what is the maximum gained antenna i can use. InAntennas approved for use with the XBee/XBee-PRO RF Modulestable, the maximum dipole antenna gain with a specified antenna is 2.1dBi. Does this mean that i can't use a dipole antenna with a gain higher than 2.1dBi on XBEE 3 Pro RF regarding to the FCC regulations?Thank you!
xbee pro s2b response query - Page 1
Forum section: electronics / beginners

author: embedded.world@aol.com
author_rank: Contributor
timestamp: June 30, 2014, 12:27:55 pm
content: I have interfaced xbee pro s2b to MCU.After sending it command mode i.e sending "+++" I received OK response.But after sending "atmy1234" I don't get ok response.Same is case for "atdl2365" & "atid5555".However I get ok response after "at" & "atcn"?Why is that so I don't get response after some commands

author: embedded.world@aol.com
author_rank: Contributor
timestamp: June 30, 2014, 01:07:20 pm
content: update: I had checked I am getting "ERR" response only after "atmy1234" only.With rest of commands I am getting OK response
Xbee serial link near ground level - Page 1
Forum section: electronics / beginners

author: Cognito
author_rank: Newbie
timestamp: March 29, 2013, 09:21:41 am
content: Hello!This will be one of my first posts on this forum, which is almost a shame considered the length of time I has been registered on this forum. I have a lot to do, but anyway; I have (surely a ridiculous) problem with the communication between two Xbees.This is my setup:- xbee nr 1. Xbee Series 2 with 2mW wire antenna. Placed 150 mm above ground(178 mm with antenna) and 17 mm above a circuit board (35 mm with antenna). This radio is placed on a rover, whose intention is to drive semi-autonomously in occupied terrain.- xbee nr 2. Xbee Pro Series 2B with 63 mW RPSMA connection. Placed inside a suitcase together with control unit, and attached with an antenna (here is where the troubles begin).I have a few questions/problems, but I start with the most important ones:1: The Rover, ground station and firmware is still put-together prototypes, but is in the final stages before constructing a much better prototype. One of the tests I ran was aimed at increasing the range of the serial communication. I used the same setup as described, with a 2.4 GHz directional antenna (https://dx.com/p/2-4ghz-16dbi-directional-high-gain-16-unit-antenna-for-wifi-wireless-network-rp-sma-33016) thinking it would work... nope.The two Xbees wouldn't establish a link whatever I tried. The antenna + coax works fine when used with other 2.4GHz applications. I'm obviously not seeing something, but I'm not and EE either. Hopefully someone of you are and/or are clever enough to think of something2: When I started developing this rover, I thought it would be nice to have the capability of more than point to point network. I have now however changed my mind and are wondering about converting to the 433 MHz 3DR radios. Is this a good choice?3: The final Rover is supposed to be made from sheet metal, which is not the best material to transmit through. My first thought is that it can't have a long antenna sticking out of it, because it is supposed to work upside-down as well as upright (<-- correct terms ?). Do you have any thoughts around that and any methods to increase range, based on the fact that this is supposed to work in woods, flat areas and hilly terrain?I can post some drawings or other material if this is helpful.Any help and feedback will be graciously appreciated
xbee tutorial for setting up a network - Page 1
Forum section: electronics / beginners

author: wolfrum
author_rank: Newbie
timestamp: June 12, 2012, 06:56:23 pm
content: xbee tutorial for setting up a network .could not find any nice tutorials .If if i find them the config looks much different.Plz help

author: montcler
author_rank: Contributor
timestamp: June 16, 2012, 04:03:04 am
content: Hello.Hope this help.Visit: 1:https://sites.google.com/site/ahmedabdien89/Embedded-Systems/xbeeintroductionhappyxbeeing2:https://www.loveelectronics.co.uk/Tutorials/7/xbee-tutorial-how-to-set-up-your-xbees

author: wolfrum
author_rank: Newbie
timestamp: June 27, 2012, 02:02:33 pm
content: thanks got it working
Xgecu t48 programmer  - Page 1
Forum section: electronics / beginners

author: jopa7
author_rank: Newbie
timestamp: January 24, 2025, 02:46:18 am
content: Anyone knows how what's the configuration I have to do on xgpro/xgecu in order to mark boot0 as boot partition? I think is the parameter partition_config 179 but don't know what to do
XGECU T48 programming of vintage EPROMs  - Page 1
Forum section: electronics / beginners

author: datwyver
author_rank: Newbie
timestamp: August 25, 2025, 03:35:41 pm
content: My new XGecu T48 programmer arrived yesterday and I had good success making copies of two different old TMS27C512 EPROMs from my system.However, I need to also make copies of six old (1990) Cypress CY7C291-50WC CMOS 2K EPROMs. Unfortunately this device is not in the T48 supported list. I tried selecting AMD 27C16 and M2716 as they are supposed to be pin compatible. I adjusted the VPP to 12.5 volts and the delay to 100ns to match the CY7C291 specifications, but in both cases the T48 returned a buffer of all FFs when reading. The same thing happened with two other devices from my system. I know that my devices are not blank as I just removed them from a working system.Any advice on configuring the T48 correctly for my CY7C291 devices would be appreciated.Dave

author: xvr
author_rank: Frequent Contributor
timestamp: August 25, 2025, 07:38:02 pm
content: Pinout of CY7C291 do not match generic 2716 EEPROM.Differencies:Pin 21 - Cypres: A10, 2716: VppPin 20 - Cypres: ~CS1, 2716: ~OEPin 19 - Cypres: CS2, 2716: A10Pin 18 - Cypres: CS3, 2716: ~CEYou should swap these pins at least for reading. As for writing - it is completely unknown (tere is no programming spec for Cypres, only pins names in Programing mode)
XGecu T56 programmer - Page 1
Forum section: electronics / beginners

author: Gods69
author_rank: Newbie
timestamp: November 17, 2020, 10:15:28 am
content: Hello,is the new XGecu T56 programmer good? I see it has 48 Pin ZIF support and can program M27C800 EPROM memories in one go. Also I see it can go up to 25V for the VPP voltage.Has anyone tried it?Thank you.

author: Gods69
author_rank: Newbie
timestamp: November 17, 2020, 01:02:56 pm
content: I'm not a Spammer! Why do you say that ?I only want to upgrade my TL866A programmer and asking opinion for buying.

author: voltsandjolts
author_rank: Unknown
timestamp: November 17, 2020, 02:05:03 pm
content: OK, my spammer detector was wrong, I apologise.I have a TL866II Plus and its a good tool.I would expect the T56 to also meet its specification but I don't know for sure.

author: Gods69
author_rank: Newbie
timestamp: November 17, 2020, 08:46:55 pm
content: No problem but it's the first time that I have been treated as a Spammer from my first post ...I finally ordered the T56 today (it could have been another model / brand).I know the TL866II is cheaper but it looks a lot like my old TL866A and I want to make some changes.I'm also curious if its FPGA cuts programming time (I usually program 27Cxxx EPROMs and ATMEL MCUs).
XHDZ-FZ-2G electronic load comparator function? - Page 1
Forum section: electronics / beginners

author: ledtester
author_rank: Super Contributor
timestamp: May 07, 2018, 01:53:53 am
content: I've been studying the XHDZ-FZ-2G electronic load board. An earlier revision was used in Voltlog #82 to create an analog electronic load. That used the XHDZ-FZ-2E version.I've attached the schematic and a pic of the -2G version.My question is what's going on with the comparator and the diodes D2 and D3.I'm not sure exactly what kind of diodes D2 and D3 are. They very will may be Zeners. They both have a forward voltage of 0.6V. Using my multimeter's diode test function the voltage in the reverse direction is 1.3V for D2 and 2.1V for D3.From comments about the -2E version of the board, it seems that the role of the LM393 was to bring the non-inverting input of the LM258 low when there was "no load between V+ and V-".V+ / V-: power supply under test connectionsVCC / GND: isolated 12V power supplyA 1N4007 diode is used to make GND 0.6V lower than V-.- Voltlog #82:https://youtu.be/2jSdfRM_Mm8- XHDZ-FZ-2E schematic:https://goo.gl/Olr6k2- Comment about the LM393 in the -2E board: (see attached image)
Xiaomi 3S phone repair or recovery - Page 1
Forum section: electronics / beginners

author: mobby_6kl
author_rank: Contributor
timestamp: May 07, 2024, 09:53:15 pm
content: My mom dunked her phone in the sea a few years back. The phone I *think* is a Redmi 3S (https://www.gsmarena.com/xiaomi_redmi_3s-8150.php). There's no model name anywhere, on the board it says "52A130 B20003 3G+32G+B" and it has a Qualcomm MSM8940. The schematics match the 3S the best though. The phone's been replaced a long time ago of course, but there might be a few days worth of vacation photos there so I thought it might be fun to try and get it working or recover the data at least for her birthday.I replaced the USB board which was the only one with visible damage (there were signs of ingress at the SIM card slot, but no corrosion visible on the motherboard) but it didn't make it work properly. When connected to USB, it'll turn on, the logo will appear on the screen for a few seconds, and it'll restart. I responds to the recovery mode (power+volume down) but gets permanently stuck on the Android Fastboot logo. Not a fan of these symptoms TBH as on PCs this could often be caused by bad RAM or corrupted BIOS or storage and I feel like that'd be next to impossible to solve on a phone.A more straightforward issue is that it's not charging the battery, so I hope it might have some power circuit issues that is also causing the above problems. The battery is at 3.8V now.This is where it starts to get interesting. I don't see 3.8Vanywhereon the board with the battery (and not USB) connected. Measuring between TP33/34 and TP36, or the two sides of C501/C502, or the diodes, it's only around2V. This would explain why it won't turn on from battery, only with USB. I don't really understand how this is possible though unless there was a short, but there isn't as far as I can tell. I checked the caps (I know it can be problematic in-circuit) and also attached a power supply to the test points, and there was 0 current draw.Any ideas what else I could check here? Thre's another section of the board around U0501 which is the main power management IC but it looks more complicated so I want to make sure I'm not missing something obvious here.The schematics I found here:https://secyukle.com/dosya/uploads/schematics/Xiaomi%2BRedmi%2B3s%2B%28land%29%2BSchematic.rarAn alternative would be to just read the data directly from the eMMC. The schematic make it look pretty easy, other than the whole BGA situation, which I'd rather not deal with yet.
XL4015 based buck convertor draws current from the output - Page 1
Forum section: electronics / beginners

author: Prehistoricman
author_rank: Regular Contributor
timestamp: March 05, 2017, 05:47:56 am
content: https://www.amazon.co.uk/DROK-Constant-Converter-Regulator-Interface-x/dp/B00T2L76FAUses XL4015:http://www.xlsemi.com/datasheet/xl4015%20datasheet.pdfI bought this for use in an 4-dynamo electricity generator. It's being used to charge a lithium battery. However the issue is that it draws something along the lines of 6mA from the battery when no electricity is being generated.The input is 4 rectifiers in series with smoothing caps. The problem persists even when this is physically disconnected from the convertor module.So how would I go about modifying the convertor to not draw current from the battery? I was thinking diodes but I'm unsure how this will interact with charging the battery

author: Prehistoricman
author_rank: Regular Contributor
timestamp: March 05, 2017, 03:13:11 pm
content: My second thought was using a solid state relay (as I don't believe a MOSFET would work here) to switch the output on when the input is highEdit: never mind, it seems SSRs have quite a high voltage drop on the output. Maybe a mechanical relay?

author: Refrigerator
author_rank: Super Contributor
timestamp: March 05, 2017, 08:58:27 pm
content: You need to trace out part of the output circuitry, there might be a voltage divider on the output or an LED that's drawing current from the output.

author: Seekonk
author_rank: Super Contributor
timestamp: March 05, 2017, 11:09:34 pm
content: A low Vf diode wouldn't be bad. The sense divider at a low voltage setting can be a couple hundred ohms If I remember right on these. That would work out to be about 6ma. A revers protection diode on the fet could feed voltage back to the source which would be low if a generator is connected directly.
xl4015 question - Page 1
Forum section: electronics / beginners

author: smile
author_rank: Regular Contributor
timestamp: October 07, 2018, 11:48:50 am
content: Hello, the datsheet for xl4015 shows that it's input is up to "Wide 8V to 36V Input Voltage Range"http://www.xlsemi.com/datasheet/xl4015%20datasheet.pdfI would like to use 27V PSU for this.Currently it is used with 18V PSU, my questions is simple - will it heat more due to higher voltage input of 27V?

author: Jacon
author_rank: Regular Contributor
timestamp: October 07, 2018, 04:49:25 pm
content: Nope - just look at the Figure 6 in your datasheet - the more voltage you apply, the better efficiencyyou get, which means not much more heat generated

author: smile
author_rank: Regular Contributor
timestamp: October 07, 2018, 09:38:49 pm
content: Thank for reply.Do you know answer to this question regarding XL4015 and XL4016?https://www.eevblog.com/forum/projects/xlsemi-xl4016e1-drop-in-replacement-for-4015/msg1875983/#msg1875983
XL4015 - Page 1
Forum section: electronics / beginners

author: Darum_Sevid
author_rank: Newbie
timestamp: October 25, 2022, 11:22:42 am
content: Hey.I bought a step down converter from aliexpress with battery charging function.It has two potentiometers for setting a voltage and current at the output.I wanna charging my li-ion battery ( 3.7V , 2200mAh ) with this.Someone told me I should use diode at the output for preventing current backflow from the battery.What exactly diode should i use ? What the connection should look like ? I am totally amateur in this matter. Pls help

author: Vovk_Z
author_rank: Super Contributor
timestamp: October 25, 2022, 06:25:48 pm
content: Can you show what exact module did you buy? Possibly it doesn't need a diode at its output.The diode has to withstand maximum charging current and about double output voltage. Shottky diode will be fine, e.g. MBR1060, MBR1645, or else.

author: Darum_Sevid
author_rank: Newbie
timestamp: October 25, 2022, 08:54:02 pm
content: Dont know how to put a picture here but description says it is XL4015 buck converter , 5A max current. I want to charge only one battery 3.7V li-ion with i think 1A max

author: ledtester
author_rank: Super Contributor
timestamp: October 25, 2022, 10:44:34 pm
content: If you are careful handling the battery you don't need the diode. The precautions include:- Do not have a battery connected to an unpowered XL4015 module.- Make sure the XL4015 voltage is always greater than the battery's voltage.- Make sure the current limit is set before connecting the battery.Quote from: Darum_Sevid on October 25, 2022, 08:54:02 pmA cheaper and simpler solution in this case is a TP4056 module. You can easily find them on aliexpress/ebay/amazon.
XL6009/LM DC converters in series with pseudo-isolation - Page 1
Forum section: electronics / beginners

author: Stephen37
author_rank: Contributor
timestamp: January 12, 2021, 08:52:26 am
content: Hello everyone,I need a 90-100V DC power supply and I was thinking whether I can isolate the inputs of XL6009 and put two of them in series (the outputs).The implementation would be one DC converter connected to its own 5V usb battery power bank and the outputs will be set to 45V each to provide 90V in series.Would this work or the smoke will come out ? If not why ?

author: Rick Law
author_rank: Super Contributor
timestamp: January 13, 2021, 03:09:53 am
content: From the way you frame the question, I take it you are new with little experience... I am rather inexperience too.One thing I learned is that the datasheet tells you a lot. The answer to the question you asked is right in there. I googled the part and found the datasheet:https://www.nikom.biz/pdf/XL6009.pdfLook at the "XL6009 Electrical Characteristics" in the datasheet, it tells you the operational limits. Output voltage is there. Reading the datasheet over is a great way to learn, so, rather than just throwing the answer back at you, I will let you explorer it and find it yourself - it is there.

author: Stephen37
author_rank: Contributor
timestamp: January 14, 2021, 11:53:39 am
content: I never tested a dc converter in series, I don't know whether only the inputs need to be isolated or the entire switch.The data sheet says the operational limits for one device in normal non-isolated mode, it doesn't say anything about output in series.

author: ledtester
author_rank: Super Contributor
timestamp: January 14, 2021, 12:37:10 pm
content: How much power do you need?There are a bunch of "nixie tube power supply" circuits which step up a low DC voltage to a much higher voltage.

author: Zero999
author_rank: Super Contributor
timestamp: January 14, 2021, 01:48:14 pm
content: It should work in theory, but the XL6009 is only really designed to work up to 36V and stepping up 5V to 45V, using a simple boost converter is a fairly big voltage jump. You could use the XL6009 to drive a suitable transformer, with a snubber circuit. If it's wound/connected like an autotransformer, it will be more efficient.
XLR mic summer - Page 1
Forum section: electronics / beginners

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: March 08, 2015, 01:17:34 am
content: HiShort background/context:I run my own side business as an audio engineer. The most frequent clients are choirs.What I want:I want to sum the choir microphones on stage into their respective voice type/group. Instead of 40+ lines from stage to console I could run four, and use four pre amps on my mixing console.I do not require more control than level of each mic, and I've guessed that I need to buffer/drive the outputs before getting to console pre amp. Maybe completely passive would suffice?I'm going to do prototypes, but wanted to check before I do so I don't mess with the rather expensive equipment.I'm still very much in the process of learning, and I've made a schematic of what my current ideas and understandings are (attached as altium exported pdf).Any and all input are much welcome! The current design is a mashup of what I've read and seen online so far, and most values are guesstimates...MORE INFO:I own the mics myself (AKG D5) so I have relatively good control on the type of devices that plug in. But I have a question: Would Phantom Power (45 volt feeded from desk to mic) be affected too much by the current design?PS: after the schematic is working I will also add digital circuitry to control the 'levels', so total lines from front of house to stage is 2 per summing box (xlr sum + xlr serial TX)PS2: and of course, I will open source everything

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: March 08, 2015, 01:40:50 am
content: RE: Use Caps;I'm not sure I understand how this would be wired up unfortunately.I see two scenarios:1) Given that I must supply phantom to each mic, I will place phantom power (PP) circuit between DS1882 and XLR connector. Then, we can use caps between PP and DS1882 to block dc, correct? (how would I go about finding good farad values?)2) Given that mixer can enable PP, do we need to protect on the side of output xlr too (#XLR2)?RE: OpAmp;Just read the datasheet and saw the opamp application note. Thanks for pointing it out.RE: Full differential;I will look into that, what is the current configuration called? As I said, I'm new to electronics, and passives in particular (worked a bit with digital µCU stuff) - so I'm trying to learn and gain knowledge and intuition on these things.Thank you so much for your answer @blueskull!Do you think I need the opamp driver?Do I need to shunt the Tip and Ring on the output side? I think the preamp typically expects ~150ohms but the mics will be the load/impedence right?

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: March 08, 2015, 01:59:40 am
content: I'll do some more research, update the schematic and post here in a few days. Thank you again for excellent input
XMC1302 programming: ERROR: Verification of RAMCode failed @ address 0x20000058. - Page 1
Forum section: electronics / beginners

author: Curby
author_rank: Contributor
timestamp: March 15, 2018, 01:08:28 pm
content: Hi there,a new core, new problems. I designed a pcb for a new project using the XMC1302 from infineon. P1.2 and P1.3 are TX/RX (Bootloader) and P0.14/P0.15 are for SWD.I changed the BMI with the memtool to SWD0. Now i could connect to the XMC1302 using the Segger J-Link Lite, provided by an infineon Evalboard.But i could only programm it one time. After this i can connect to the controller, but erase, programming etc. is not working anymore. Doing an erase i get the following error:Code:Verification of RAMCode failed @ address 0x2000002C.Write: 0x9D04B5E0 1E7F2700Read: 0x4E8275F0 1E7F2700Failed to prepare for programming.Failed to download RAMCode!All voltages are correct, Segger can connect but not erase, programm etc. I can read the memory using JLink.On a second board is the same behaviour. The programm programmed the first time is not running, until i press programm or erase - and not chaged or erased of course, just running.What is happening? Can anybody help me here?
XML Attribute Name or Nmtoken - Page 1
Forum section: electronics / beginners

author: metrologist
author_rank: Super Contributor
timestamp: October 02, 2018, 03:21:04 pm
content: I am having an XML Parser Error at line 34, char 64, Message:Attribute 'boardno' refers to an unknown entity '1'The value '1' for attribute 'boardno' must be Name or NmtokenI'm not able to get past this or understand the problem as name or Nmtoken seem to have few limitations on characters that can be used.XML code:Code:<graphic boardno = "1" boardfile = "Caution.jpg"></graphic>DTD bits:Code:<!ELEMENT graphic (mapref*)><!ATTLIST graphic%graphicatt;hplace (left | right | center | none ) #IMPLIEDgraphsty NMTOKEN #IMPLIEDapplicable IDREFS #IMPLIED%bodyatt;><!ENTITY % graphicatt " boardno ENTITY #REQUIREDboardfile CDATA #IMPLIEDreprowid CDATA #IMPLIEDreprodep CDATA #IMPLIED%graphicunit;hscale CDATA #IMPLIEDvscale CDATA #IMPLIEDscalefit (yes | no ) #IMPLIEDalt CDATA #IMPLIED">
XO Surface Mount Soldering (leadless packages) - Page 1
Forum section: electronics / beginners

author: brokensegue
author_rank: Contributor
timestamp: November 20, 2021, 07:27:13 pm
content: So I ordered this  crystal oscillator package to build a prototype of my circuit. It seems to work as I expected but now I have an issue.I cannot seem to find any 32.768kHz oscillators in through-hole. For prototyping I hacked up my own breakout board for it but now I'd like to order a PCB and solder the chip down. I'm okish at soldering but this would be by the smallest/hardest chip I've worked with. I'm not sure if you can use a normal iron to solder this kind of packages (the pins are totally hidden under the package). So what equipment/supplies do I need to solder this chip? Hot air? Can I do this without a stencil?I did some research and this video  suggests you can hand solder it normally if it's castellated but I don't think this particular package is castellated (at least by my visual inspection). Would trying this still be easier?I'm not even sure what this kind of package is called. I can't seem to find a footprint on kicad for it. Is there a standard footprint for this or should I just create my own footprint from the diagram? I know some footprints for hand soldering are different. Should I make the pads extra big?Thanks for any help.https://www.mouser.com/ProductDetail/ABRACON/ASEKDV-32768kHz-LC-T?qs=sGAEpiMZZMv0NwlthflBi%2FVa9lmVjdDVxl0ehsuD1Ws%3D

author: ataradov
author_rank: Super Contributor
timestamp: November 20, 2021, 07:37:04 pm
content: Usually they still have some exposed solderable surface on the side. It is not ideal, but possible to use them. If your package does not have anything at all, which often happens with MEMS oscillators, then there are not too many options.But yes, for better results you need hot air station. No need for a stencil or anything else. Just tin the pads using normal solder and then use hot air station to mount the part. For crystals it is usually pretty easy (compared to QFN and other stuff like this).Noticed the link. You can clearly see that pad contacts extend to the corners. So the solderable castellations are right on the corners of the devices, not on the sides as in the video.As for the footprint - you can probably find one, it is more or less standard 2.5x3.2mm package. But most small 4-pin footprints will work, especially for manual soldering.

author: wraper
author_rank: Unknown
timestamp: November 20, 2021, 07:48:28 pm
content: Quote from: ataradov on November 20, 2021, 07:37:04 pmFrom that exposed metalized surface solder will flow to the pads underneath the part and it can be soldered just as well as by hot air. However 3225 package is too small to easily access them with soldering iron. Something like 5032 (5.0 x 3.2 mm) or 7050 is easier to solder without hot air. However I strongly suggest acquiring a hot air station. It's an essential tool these days. Through-hole packaging is essentially dead for many kinds of parts and SMD soldering is not that hard at all.