hybridfree/eevblog-posts huggingface dataset:
Small VFD - Page 1
Forum section: electronics / projects

author: najrao
author_rank: Regular Contributor
timestamp: January 25, 2018, 05:54:43 am
content: I need to run a small (<150W) three-phase motor at higher adjustable speed than the 1400 rpm @50Hz. As luck would have it, I have found a pcb seemingly ideal for this. I do not know what it was meant for originally.Other than the mains input and motor connections, there is only just a four pin socket (header), with markings as in pic.The external circuitry to be connected is entirely isolated by the two opto's, needing only logic level (5V). One opto has its LED input at the header pins, and is wired to the pin marked '5V' through a resistor, with the cathode left open at the third pin. The other opto is assembled with its LED input on the live micro controller side, and just the transistor output at the remaining two pins of the header. The markings are 'RPM' and 'FB' respectively. I would have thought FB is for feedback, and cannot be the output of an opto.I have removed the heatsink to see markings on the power chip, there are none. The microcontroller is also undecodable. The IGBT bridge should be several amps at least. The power input is wired for 230V single phase.Connecting a dc 5V supply ANYWAYS does not enable operation.What is wrong?

author: Bratster
author_rank: Frequent Contributor
timestamp: January 25, 2018, 06:49:17 am
content: The RPM input is active low, but will need some sort of pwm or something along those lines to make the controller happy most likely.The feedback output is also active low, but needs a pull-up resistor to 5v.I'm going to guess that board may have come from a washing machine.EDIT: nevermind, looked up the part number and it looks like it's from a refrigerator. Weird.Here is an article where someone salvaged the motor and controller from a washing machine and made it work. It's a different board and manufacturer, however there is some overlap.https://hackaday.io/project/28630-variable-speed-washer-motor-and-controller-reuseBe safe.Sent from my Nexus 6 using Tapatalk

author: Theobald
author_rank: Contributor
timestamp: January 25, 2018, 08:57:48 am
content: But too reach high efficiency, I guess you can find VFD in refrigerator also.Big 400V caps, dissipator, rectifier, it really looks like a 3-phase VFD or brushless driver.Theo

author: najrao
author_rank: Regular Contributor
timestamp: January 25, 2018, 03:39:43 pm
content: Thank you, Bratster. I had come to the same conclusion, refrigerator.I have several af and rf signal generators, but none offers duty cycle adjust. Have to make up a 555 circuit, with isolated 5V Vcc for it. Or is there anything even simpler? Closing the loop is far away yet.Hackaday was helpful, but how did he guess low duty cycles will do it? Remarkable.Need time to get back and report if pwm and duty will set it up.
Small weatherproof PCB connector - Page 1
Forum section: electronics / projects

author: poorchava
author_rank: Super Contributor
timestamp: September 12, 2017, 10:05:08 pm
content: Hi,I'm working on a small device, a wireless sensor of a kind. It is powered by a 250mAh LiPo cell and the entire thing has to be potted (or heavily conformal-coated). Do you know of any connector that would be small, pcb mountable and reasonably resistant to corrosion? The deice is obviously small, so all "rugged, waterproof, IP666" connectors that cost $100/pc are not an option becasue of the size. There is not anough space in the enclosure and in the budget to get wireless charging.Do you have any ieas?

author: danadak
author_rank: Super Contributor
timestamp: September 13, 2017, 11:50:10 am
content: Have you looked at the Amphenol, Molex catalogs ?Also, contact the FAEs at respective vendors for suggestions, after describing application to them.Regards, Dana.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: September 13, 2017, 04:39:32 pm
content: There are screw-in type 3.5mm phone plugs that are waterproof. Use a standard jack and implement the threads in the case design (assuming you are doing a custom injection mold). This is common in amateur radio handhelds.

author: ConKbot
author_rank: Super Contributor
timestamp: September 14, 2017, 05:19:36 pm
content: Have you checked out metric threaded industrial connectors? I.E. The M8 and M12 connectors used in industrial sensors. Waterproof, rugged, and through hole panel mount options are in the $10 price range in low quantities from digikey and mouser and such. Plus pre-made harnesses and pigtails should be available.

author: JPortici
author_rank: Super Contributor
timestamp: September 14, 2017, 05:59:04 pm
content: Quote from: danadak on September 13, 2017, 11:50:10 amthis is the best course of action.I would also suggest you to contact wurth, tyco, delphi.wurth will probably even propose to make a custom connector/variant for you, they are very versatile.don't know how small is small, how many pins and such, but have a look at automotive connectors as they are usually sealed/ip6x
Small wire to wire connectors - Page 1
Forum section: electronics / projects

author: Dajgoro
author_rank: Frequent Contributor
timestamp: April 27, 2021, 09:36:27 am
content: HiI have quite a simple problem, that turns out to be not so trivial.What I have is a IDC cable which branches out from a 40 pin connector to smaller bits which connect to different things.The issue I'm having is that the space is quite tight, and on the other side the IDC solders directly to tiny pads but I still need a way to disconnect the various branches.I went looking for a 4 or 6 pin wire to wire connector with 1.27 pin pitch but I can't find anything that is abundant in stock/available. Even with 2.5mm pitch or larger I can only find microfit connectorsbut I'd like to find something smaller. A wire to wire jst connector setup wold be ideal, but can't find such either.Is there anything like that on mouser/tme/farnell?I'd also like to avoid "china special" components.
Smart Aircon controller? - Page 1
Forum section: electronics / projects

author: JBussell
author_rank: Newbie
timestamp: October 04, 2023, 04:15:56 am
content: I have a standard ducted A/C with a wall remote (see photo).The unit didn't come with the optional IR remote.I would like a smart controller for it to turn it on when I'm out. There's lots of products out there but they require the IR remote.Is there any way of adding a smart controller to it?I have asked the manufacturer but they don't stock the remote.Unfortunately it's a non standard brand, Prelude PD09M12.

author: Shonky
author_rank: Frequent Contributor
timestamp: October 04, 2023, 07:53:56 am
content: I see a few options1) Figure out the IR protocol - either find someone with the right remote or buy one (ebay?) if you can or perhaps you can get lucky trying existing known protocols for off brand AC controls? Are there "universal" remotes for AC?2) Intercept what the unit does itself to control the system, which could be a fairly significant reverse engineering work.3) If you just want on/off would some kind of switchbot be good enough? Alternately some kind of ESP32 or similar that connects to the internal power push button and "presses" it electrically for you. That wouldn't be too complex and could probably also detect and report if the unit is on or off.If you just want on/off that can make it a lot simpler in terms of control. If you want to get into setting temps, controlling zones etc it's becomes a bit more complicatedWhat amount of control does it have? Do you have many/multiple zones? Does the controller measure temperature itself?

author: ajb
author_rank: Super Contributor
timestamp: October 04, 2023, 03:26:45 pm
content: In my part of the world a "standard ducted A/C" would have simple contact closure inputs that the thermostat activates to call for cooling (or heat) and run the fan, so it's very easy to fit a replacement thermostat with built-in app support if that's what you want. Is that not the case here? I know a lot of mini split systems use proprietary control links to enable more complex control algorithms, so it wouldn't be out of the question to see it on whole-house systems.

author: SeanB
author_rank: Super Contributor
timestamp: October 04, 2023, 06:37:49 pm
content: There are universal AC remotes, very common item, as AC remotes do tend to be lost, destroyed by leaking batteries, or simply fail because they get abused. Sub $10 item the last time I bought one, and with 1001 models listed as being controlled by it.That one, though marked "Prelude", it is likely a badge job on a common generic remote, made by a few Chinese companies.
Smart Battery Charger - Page 1
Forum section: electronics / projects

author: lucatz
author_rank: Contributor
timestamp: October 20, 2020, 12:40:29 am
content: Hi All,Basing a smart charger project to learn on a LTC1325 and Arduino microcontroller...Am I off the track?Thank YouLuca

author: Ed inMelb
author_rank: Newbie
timestamp: October 20, 2020, 10:56:18 am
content: I make batteries and super caps, Carbon, graphite, graphine, Borine and other types including gravity batteries. All different battery chemistries require very specific charging regimes. I work out what that is, design a circuit and program an arduino or other microprocessor to tailor the charging. In my experience, you only need to know how to use mosfets and other transistors, shunts, inductors, etc. No need for the silicon you are suggesting. If you don't mind me asking, what is your purpose? To learn arduino or learn discrete chips? Most smart chargers are not very smart.

author: lucatz
author_rank: Contributor
timestamp: October 20, 2020, 05:55:32 pm
content: Hi Ed,Yes most chargers are rather non-intelligent. I saw my own charger charge a fully charged batt like it was dead. So decided there must be a better way and started looking around. My goal is more a project for myself and to share what I find along the way. Many years ago in college I had many classes in electronics and I am rekindling my passion for it albeit rusty. Today I work in a different field with no electronicsArduino, and all aspects of the project is what I looking for but you do bring up a good point that it can be achieved differently. Will keep that in mind.Thank YouLuca
Smart car DAB radio  project - OEM Grundig - Arduino - Page 1
Forum section: electronics / projects

author: chema.rb
author_rank: Contributor
timestamp: December 05, 2017, 01:22:31 pm
content: Hi!I have an Smart Roadster and it´s radio is not DAB capable. I was thinking about using the case of an original radio but with Arduino internals. I have a few challenges to overcome, but I am sure I will learn on the process.Right now, I have a tape player and I am trying to identify it´s front panel connections so I can use as a display and controls for the Arduino:The IC is a Philips (now NXP) PCF8576CT that controls a 40 pin 8x1 LCD with some additional segments. It can be controled by I2C. From the connections, and the datasheet, I have identified that the LCD has a 4-mux interface to the IC.The buttons are connected thru resistors so I can use 2 analog inputs to interface with the 2 halves of they keypad.I think is quite safe to power it with 5v and start messing around. What do you think?

author: Scrts
author_rank: Frequent Contributor
timestamp: December 05, 2017, 04:35:32 pm
content: You probably understand, that it will be cheaper to buy the radio?Otherwise, do you know how you will hook up antenna and route out analog audio out of the module?

author: chema.rb
author_rank: Contributor
timestamp: December 05, 2017, 06:47:25 pm
content: Yeah, I'm very aware of the cost... but I am more interested in earning and reverse engineer that saving a few pence.For the radio module, I'll probably use something based on the Si468x, and for amplifier it would be a TAS6424. I'm considering using I2S for the audio instead of analog. Probably a bit too ambicious for me, but I'm sure a will learn a lot during the process.

author: chema.rb
author_rank: Contributor
timestamp: December 05, 2017, 06:56:05 pm
content: Yesterday I ws trying to identifiy some of the connections on the front panel board:1 SDA2 led +345 GND6 encoder7 Encoder switch1 buttons right side2 buttons left side34 SCL5 VDD67 led -

author: Scrts
author_rank: Frequent Contributor
timestamp: December 05, 2017, 07:24:18 pm
content: Quote from: chema.rb on December 05, 2017, 06:47:25 pmAnd then what DAC from I2S? Seems like the projects gets complex every step in.

author: chema.rb
author_rank: Contributor
timestamp: December 05, 2017, 07:51:36 pm
content: TAS6424 supports i2S inputs.... but you are right, complexity escalates rapidly in this project.
Smart home automation project - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: June 04, 2013, 07:32:11 am
content: Hey guys check out my final year B.Tech project completed and evaluted.Sorry guys this not that much techy but i think it's pretty well designed for a final year project occasion.FEATURES OF THE PROJECT:1. Control upto four home appliances wirelessly.2. Monitor status of your home like temperature inside and outside of your home, light intensity inside and outside of your home, motion (presence) on the main entrance, LPG leak in the home and status of you main door.3. Open/close your main door electrically and wirelessly.4. As the android application is password protected, it automatically adds security to your home as it can be controlled by the user only.5. Automate your indoor lightening, outdoor lightening and fan/AC to switch ON/OFF automatically when the light intensity and temperature conditions exceed the programmed threshold values (This feature, is named as “SENSOMATE”).6. Has power programmable saving mode for outdoor light, such that it will automatically switch ON if a motion is detected on the main entrance, otherwise will be OFF.7. It automatically monitor your home against LPG leaks and cases of fire. If it detects something wrong,I automatically switches off all home appliances instantly and immediately opens the door to let the LPG/fire exhaust off your home.8. Has a “SLEEP MODE”, once activated will switch your light off and program the motion sensor and door sensor to raise alarm if anything goes wrong.9. As it uses Bluetooth, the user can use the android phone within a range from 10-100m (currently upto 10m because of using class 2 device).The microcontroller code is written in bascom, pcb is designed in eagle and the android application is designed in basic4android compiler.Check out more of my posts at "embeddedfortheevil.wordpres.com".
smart lcd - Page 1
Forum section: electronics / projects

author: herp
author_rank: Newbie
timestamp: July 08, 2013, 08:25:04 pm
content: Hi everybodyEven if it already exists, I've recently started to build a smart display, only for "fun". This display is based on 2.8' tft coming from ebay (a cheap one with a ILI9320 controler + touchscreen) and a good'old PIC32. I've also designed a small PCB (2 layers) to make this project cleaner.All the source code is written in C and under GPL3 licence; the schematics & PCB areopen source hardware.For now, only the following 2D functions are implemented:- Basic clipping- Line, circle, rect, polygon; normal & filled- Text (1BPP and 4BPP for pseudo AA)- CLUT (4BPP & 8BPP + operations like black & white transform, gradient, alpha update)- Sprite (8BPP)- double bufferingBy using these functions, I plan to make a whole GUI with some widgets (button, checkbox, radio, value box...), on a single layer (no windows manager). The final purpose is to get a small & easy-to-use GUI, drivable by a small microcontroller through a uart, like common smart displays.Schematics & source code are in attachments.More information (including a short video) are provided athttp://herptronix.blogspot.fr/2013/07/open-source-smart-display.html(in french, sorry, I didn't translated yet)
Smart Li-Ion chargers - Page 1
Forum section: electronics / projects

author: moffy
author_rank: Super Contributor
timestamp: October 05, 2016, 10:51:48 pm
content: I have been reading a little on Li-Ion batteries and all the recommended charging regimes are based upon knowing the capacity of the battery in advance i.e. reading some ID etc. Then I ran across this:http://www.ebay.com.au/itm/Portable-Universal-i4-Intelligent-Li-ion-NiMH-18650-26650-AA-AAA-Battery-Charger-/351603380152?var=&hash=item51dd31cfb8:m:mWm_bLKBrN0dycN806DqH3wwhich seems to cope with an enormous range of capacities, without knowing in advance the individual batteries capacity. Perhaps they measure dv/dt vs I in the constant current phase and deduce it from that? I would love to hear your opinions concerning their claims.

author: Audioguru
author_rank: Super Contributor
timestamp: October 06, 2016, 03:16:50 am
content: It is an extremely cheap No-Name-Brand Chinese piece of junk. They can claim anything! Is it certified to be safe or will it burn down your home?

author: HKJ
author_rank: Super Contributor
timestamp: October 06, 2016, 04:21:49 am
content: You can see a lot of LiIon (and NiMH) chargers tested here:http://www.lygte-info.dk/info/indexBatteriesAndChargers%20UK.htmlThe test includes voltage/current curves of the charging.It looks like it is this one you have found:http://lygte-info.dk/review/Review%20Charger%20Xiamen%20Nanfu%20HG-1412W%20UK.htmlThat review also includes a tear down.

author: amyk
author_rank: Super Contributor
timestamp: October 06, 2016, 11:04:34 am
content: Actually looks quite decent safety-wise except for the slightly-too-high voltage and unusual current burst at the start (might be possible to fix these, the circuitry is pretty simple). Is the "tongue" in the case supposed to fit in the isolation slot? It seems to be in the right position and has a small cutout for the optocoupler.And passing 5kV isolation test is better than what a lot of cheap chargers can do... many don't even have an isolation slot.

author: moffy
author_rank: Super Contributor
timestamp: October 06, 2016, 11:13:54 pm
content: Wow, thanks very much for all of your responses especially the links to the testing site, very informative. I like the comment at the end:"The charger will charge lots of chemistries, but it do not use the correct algorithm for any of them.The charger is useable, but not the correct charger if you care about your batteries or want a safe charger."
smart load design - Page 1
Forum section: electronics / projects

author: sarepairman2
author_rank: Frequent Contributor
timestamp: April 24, 2016, 07:54:26 am
content: is there one? are all the loads stupid?

author: Kilrah
author_rank: Unknown
timestamp: April 24, 2016, 08:05:46 am
content: Probably depends on your definition of "smart".

author: mij59
author_rank: Frequent Contributor
timestamp: April 24, 2016, 05:26:09 pm
content: Could be a design by Maxwell Smart.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: April 25, 2016, 05:41:50 pm
content: Buy a goat, call it "load".teach load how to read and write.You now have a smart load.
Smart Modular Platform Robot - Page 1
Forum section: electronics / projects

author: bigdinotech
author_rank: Newbie
timestamp: December 09, 2012, 05:35:03 pm
content: SMP - Smart Modular PlatformSMP is an open source platform that can be used for many application such as roboticsThis video features SMP used in robot with wireless control and onboard video.Wireless control and telemetry is achieved using an Xbee and onboard video is recorded using a HackHD camera.project originally started as a Senior Design Project last year where we used and developed SMP in a head controlled smart wheelchairmore videos to come soon
Smart Router - Page 1
Forum section: electronics / projects

author: PULSSAIR
author_rank: Contributor
timestamp: August 04, 2014, 11:08:32 am
content: Hello everybody,I want to make a router, that has also a single board computer integrated. The point of the SBC is to provide USB3.0 and USB2.0(printer or other devices) access to the network.So, i plan to use a CPU module with the IMX6 MPU from freescale. For the USB3.0 i will use a 4 port USB to PCI bridge and for the USB2.0, i will use the 2 prots from the CPU Module. Maybe i will put some GPIO on a parallel port and a RS232.The problem is that I'm not good at software, so any help would be apreciated.

author: rob77
author_rank: Super Contributor
timestamp: August 04, 2014, 11:33:41 am
content: sounds like SOAPbtw... what's the problem with software ? you need a device driver/ kernel module for the USB controller and Bob's your uncle !

author: PULSSAIR
author_rank: Contributor
timestamp: August 04, 2014, 12:35:26 pm
content: Not really. I want just a way to be able to read/write USB3.0 drives and pen drives(I know that it will not come close to the USB3.0 speed, but it will do better than 50mB/sec). And the bonus, I could also conect a printer to the network and also maybe use the MPU to simulate a NAS(using the drives connected to USB ports).I plan to use a stripped Linux, but the problem is that i don't have any sort of experience with OS. Not that this would be a problem(this project is more about the journey than the destination).This project is a long term one and I want to make it for myself, but if somebody is interested i may do a small batch(or big).

author: rob77
author_rank: Super Contributor
timestamp: August 04, 2014, 01:48:16 pm
content: how do you plan to make a router if you got no experience with linux OS ? i don't get it.but first of all - start learning linux internals , you will be not able to do anything on your project without serious knowledge in the area.

author: Monkeh
author_rank: Super Contributor
timestamp: August 04, 2014, 02:19:50 pm
content: Quote from: PULSSAIR on August 04, 2014, 12:35:26 pmThis is already doable and _done_, with a very large variety of hardware already on the market.https://openwrt.org/
Smart Switch ESP8266 - Page 1
Forum section: electronics / projects

author: pknoe3lh
author_rank: Regular Contributor
timestamp: February 05, 2018, 05:03:45 pm
content: My new Projekt I want to show you:English Version:German Version:I used an IKEA Time Switch: (it look like its discontinued....)http://www.ikeaddict.com/ikeapedia/en/Product/80134449/us-en/tanda-timer-24-hours-indoor-ungrounded-white/Entry/And modified it into a Smart Switch using an ESP8266.Feedback to the video is wellcome!Any questions?
Smart way of driving mechanical 7-Segment displays - Page 1
Forum section: electronics / projects

author: 128er
author_rank: Regular Contributor
timestamp: August 22, 2015, 05:21:27 pm
content: Hey Guys!I scored quite a few of those electromechanical 7-segment displays:http://www.flipdots.com/electromagnetic-small-7-segment-display.html#.Vdis55e8R-IThe segments are bistable ones. Applying a pulse show them, a reversed pulse hide them.I'm planning to build a six digit clock (HH:MM:SS) out of them. Now I ask myself, what is the smartest way to drive the segments? A discrete H-bridge for each segment as shown in option B, results in a minimum count of 168 transistors for 6 digits. Option C is half of that, 84 transistors.So I came up with a matrix circuit as used for flip dot displays (Opt. A). Is there another way that I forgot about?I am open to any suggestion that belongs to this project. Thanks!

author: 128er
author_rank: Regular Contributor
timestamp: August 25, 2015, 10:05:40 pm
content: No opinions?

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: August 25, 2015, 10:12:45 pm
content: Couldn't you use analog switches to multiplex one bridge to e.g. drive 7 segments sequentially?If pin count matters, you could use 74HCT595 (maybe multiple ones in a daisy chain) to control the inputs of the analog switches via SPI.
Smartcard / SIM card filesystem viewer software - Page 1
Forum section: electronics / projects

author: ivan747
author_rank: Super Contributor
timestamp: April 26, 2018, 08:10:32 pm
content: Hi guys,I have a Dell laptop with Smartcard reader. I was wondering if any of you knew of a software that can send commands and explore the filesystem of smartcards, one that I can use with my laptop. I already inserted a credit card and it was detected as an unknown smart card.The reader is detected by Windows as a "Microsoft Usbccid smartcard reader (WUDF)".Thanks!

author: L1L1
author_rank: Regular Contributor
timestamp: April 26, 2018, 09:04:49 pm
content: You could try cardpeek.http://pannetrat.com/Cardpeek/Disclosure: I'm the author of that software, and through it hasn't been updated for a year, it's quite capable.

author: ivan747
author_rank: Super Contributor
timestamp: April 27, 2018, 12:42:19 pm
content: Quote from: L1L1 on April 26, 2018, 09:04:49 pmThanks L1L1, I will check it out!

author: ivan747
author_rank: Super Contributor
timestamp: April 27, 2018, 12:51:00 pm
content: Quote from: L1L1 on April 26, 2018, 09:04:49 pmL1L1, why can't the software read the USIM data on recent SIM cards? Is it because of some type of authentication? I have access to the authentication key (Ki) of the SIM card I am playing with.Edit: it works, I can read my credit card. Now I have to get an adapter to insert a SIM card into it.

author: ivan747
author_rank: Super Contributor
timestamp: May 02, 2018, 06:19:16 pm
content: Bump.Any other software, guys?
SmartPhone battery emulator and dis/chargeometer counts down! - Page 1
Forum section: electronics / projects

author: MT
author_rank: Super Contributor
timestamp: August 11, 2019, 01:52:21 am
content: A smartphone battery recently went slightly balloony (gas) it have been runing for several years with its charger on day time hours so that have being excessive wear on the battery, yet bat charges up to 4.3V and deliver power but current capacity is ofcource somewhat reduced.Anyhow i made a battery emulator, the phone works but i ponder about the dis/chargeometers operation. With the bat emulator connected the dis/chargometer counts down as if there was an actual battery in the phone, If an additional charger then applied to the normal charge USB port the diss/chargeometer still counts down but very slow, it also displays the same discharge number even if phone shut down and all power removed.So whats going on here? Can the NTC dummy resistor R2 (i picked i mid range value of 8,4-9,5kohm)and Bat type resistor R3 (was 10k in the original bat) have a role in this?How is the software actually measuring the charge/discharge?

author: MT
author_rank: Super Contributor
timestamp: August 11, 2019, 03:14:18 am
content: How weird!? around 75% on the dis/chargeometer then the dis/chargeometer went 100% and signaled: full charge, remove charger.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 11, 2019, 05:03:07 am
content: The diode trick was once well known in Perk mining. If you also supply power to the USB port, most likely everything will work just fine.

author: MT
author_rank: Super Contributor
timestamp: August 12, 2019, 02:33:29 pm
content: Quote from: NiHaoMike on August 11, 2019, 05:03:07 amPerk Mining?! newer heard of that!Everything works fine with just battery emulator , except for taking pictures with flash light on the momentarily peak current drawn is to big for the original Huawei SMPS so phone instantly shuts off, not god for Linux system, but i assume with bigger current supply that would be cured.
Smartphone electromagnetic field visualizer with augmented reality - Page 1
Forum section: electronics / projects

author: Bud
author_rank: Super Contributor
timestamp: October 29, 2022, 02:51:16 am
content: I came across this cool RF toy, a smartphone based electromagnetic filed scanner with augmented reality. Once scanned, a EM map is overlay-ed on the image in real time.https://luxondes.com/en/an_scanphone/

author: jonpaul
author_rank: Super Contributor
timestamp: October 30, 2022, 05:53:17 pm
content: great concept, no prices, images seem graphics, not photos.Need to revisit in 6..24 months.Jon

author: Terry Bites
author_rank: Super Contributor
timestamp: October 31, 2022, 06:41:02 pm
content: Do you mean there's a Tricorder app covering all bands simultaneously- in colour?At last!I think toy would be the right word.
Smartphone Fingerprint sensors - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 23, 2018, 01:49:09 pm
content: Hi,I have searched the net for finding the honor 7x fingerprint sensor, it's super cheap!But I couldn't find any datasheet on that, I want to know if you know some small form factor Fingerprint sensors with datasheet, I'm sure there are lot's of Cool projects that we could do with them? who makes them? what are our options?
Smartphone magnetometer for DC current measurement - Page 1
Forum section: electronics / projects

author: babysitter
author_rank: Frequent Contributor
timestamp: October 04, 2017, 08:48:33 pm
content: Hi,today my lazyness prevented me from grabbing a digital multimeter when I was curious if a switched 10A DC circuit is on or off.Considering how Lord Kelvin and the other great old guys measured DC currents, i popped out my mobilephone, set it to the field test mode and wanted to see if the current causes a visible result.... it does.Field test mode of Samsung phones can be summoned up by entering *#0*# into the phone app.. then select "Sensor" and watch the three components of the mag sensor.I was able to see the switch state, my curiousity was satisfied.At home I made a little video, showing the effect:https://youtu.be/oSH31KV1ODgThis way, one can indicate a current.Refining the method, e..g using a fixture for orientation of the mobilephone sensor regarding earth magnetic field and wire, could allow some basic measurement. I have just put my phone on top of a sealed lead acid battery and was able to monitor the relative current during discharge. A dedicated app, using the X Y and Z component and a multiplier and offset value might be a nice tool - interested, anyone ?Best regardsHendrikP.S.: Yes, I see that the compass needs calibration, too.
APC Smartups 5000 208V => 120V conversion Possible? - Page 1
Forum section: electronics / projects

author: Mikek400
author_rank: Regular Contributor
timestamp: January 25, 2024, 12:09:03 am
content: I have a few 208V SU5000s and considering how to convert one to work on 120V,or run on 240v (which it will) and output center tapped 240V. (L1 120V, N, L2 120V) which it doesn't.I haven't looked at it recently but I remember it has 2 transformers inside like the 120V SU3000 I have.Is it just a matter of changing how these 2 transformers are connected and replacing resistors on the circuit board to make it think it is getting / outputting 208V ?Maybe even possible to change settings via the serial port?Thanks for any input.

author: Mikek400
author_rank: Regular Contributor
timestamp: February 01, 2024, 05:51:34 pm
content: After digging around it seems possible to make a 120v unit into a 240v unit by changing the transformers from series to parallel output and changing the various 120v rated components to 240v... This 208v unit has the transformers in series already, so if you put them in parallel it will make the voltage go to 416V which is no good.Unfortunately the answer isn't any fun hackery, it is to use the 208v to 120v stepdown transformer they make for this which I managed to get. It is rated for the full 5000VA that the UPS is supposed to supply.
SMB/SMD case ferrite inductor identification? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 17, 2019, 07:08:13 am
content: Hi!Can anyone suggest, for completeness, a method of finding out the maker/type number of a ferrite bead that looks physically like an SMB package diode?Is measurement of physical size the only convenient way?They're used in a power supply in series with fast–recovery SOD–80 diode rectifiers, and needless to say, totally devoid of markings!Unfortunately I'm not an EMC or RF design expert and I'm bemused at the sheer number of these things in different packages, types, impedances, etc., etc.,The two I found that most closely matched the things I had were:–https://uk.rs-online.com/mobile/p/ferrite-beads/4673494/or the Fastron SMB/001–999X–01I've worked out a suitable circuit–symbol to document them with, but even I can't identify the exact type originally fitted it would be nice to suggest the most likely candidate on a circuit–diagram!Chris Williams

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 17, 2019, 07:57:10 am
content: If there's no markings, there's no markings...So, molded and leaded? Seems like I've seen a lot of Panasonic parts turn up like that. No idea.Really what matters though, measure its impedance at a few spot frequencies (100MHz being the most common choice). If you can break away the plastic to see what size the core is, that'll give you an idea what equivalent chip size to use.If it's not encapsulated but a naked core like the Fair-Rite part pictured, mind that it matters if it's gapped or not. The gap may be thin and hard to see. Gap means it's an inductor, i.e., probably doesn't saturate under load current.Tim

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 17, 2019, 09:48:54 am
content: Hi!Oh dear, that needs a V.N.A. and I can't run to one of those in the rest of my lifetime and the next. . .!!Is there any cheap means of measuring impedance @ 100MHz?Chris Williams
SMBUS I2C can I use for other non SMBUS devices - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: September 01, 2019, 09:46:12 am
content: Hi,I am using an I2C port as SMBUS to communicate with BB-2590 series battery packs. These battery packs are compatible to SMBUS commands.Can I share this I2C bus with other devices that do not support SMBUS commands??The I2C addresses are different .

author: MosherIV
author_rank: Super Contributor
timestamp: September 01, 2019, 11:06:34 am
content: Hi. Yes, SMBUS is a protocol that sits on top of I2C, you should be able to talk I2C over a SMBUS as well.Your SMBUS controller though may not let you, or it may be an I2C controller that is being fed SMBUS messages.
SMD assy station - Page 1
Forum section: electronics / projects

author: wkb
author_rank: Super Contributor
timestamp: December 29, 2011, 04:41:47 pm
content: Today I finally had time to finalise my SMD assembly station. Or rather, it is a generic TV/video based loupe for all sorts of fiddly assembly & repair work (I already used it to repair a camera lens).It is a thrown-together piece of kit consisting ofa Philips CCD CCTV cameraa Computar macro-zoom (C-mount)a slightly-tweakerd stand from a stereo microscope2 USB LED bars, with thanks to DXa LCD panel commonly found mounted on the back of the headrests in carsa wall-wart PSU to power the LCDYesterday I created an aluminium mounting ring (a lathe & milling machine are quite useful toys, even for an EE) to mount the USB LED bars onto the stand.I must say, I'm quite happy with the result of my work

author: robrenz
author_rank: Super Contributor
timestamp: December 30, 2011, 12:01:50 am
content: Nice job!

author: Teknotronix
author_rank: Regular Contributor
timestamp: December 30, 2011, 12:11:10 am
content: Wow! Nice

author: amspire
author_rank: Super Contributor
timestamp: December 30, 2011, 01:31:18 am
content: That is really great. How much did the Computar macro-zoom lens cost?

author: george graves
author_rank: Super Contributor
timestamp: December 30, 2011, 04:25:14 am
content: subscribed!

author: JuKu
author_rank: Frequent Contributor
timestamp: December 30, 2011, 07:05:40 am
content: Very cool! Out of curiosity,> a slightly-tweakerd stand from a stereo microscopeWhat was wrong with a stereo microscope, and what, in your opinion, is the biggest gain with your arrangement? (I'm currently using a microscope, but always looking for better tools.)

author: wkb
author_rank: Super Contributor
timestamp: December 30, 2011, 08:49:22 am
content: Quote from: amspire on December 30, 2011, 01:31:18 amI found the lens surplus at a ham fest, for € 15.Attached are the specs.

author: wkb
author_rank: Super Contributor
timestamp: December 30, 2011, 09:01:42 am
content: Quote from: JuKu on December 30, 2011, 07:05:40 amThere is nothing wrong with the standard stereo microscope perse, I was just in the mood to build this video based version.The advantage of the stereo microscope: well, it is stereoscopic, which is niceThe advantage of the video one: it can change magnification using the zoomlens, it is to an extent easier on the eyesSo they are complmentary in my book. I did not really alter the stand, other than that the horizontal metal bar now has a 1/5" UNC threaded bolt on which I can screw the tripod end of the Philips CCTV camera. If I unscrew that bolt I can fit the original microscope.
SMD board for prototyping & testing - Page 1
Forum section: electronics / projects

author: Aluminio
author_rank: Newbie
timestamp: December 24, 2010, 11:47:49 pm
content: Does anybody know where to buy the boards that Dave uses for testing SMD components (see Blog 134 at 6:45)?It looks that you can mount losts of different smd footprints.Dave, If you make them yourself, can you sell them on your store?Regards to all,Aluminio

author: lgrfbs
author_rank: Contributor
timestamp: December 25, 2010, 12:35:30 am
content: Look here for some board:http://www.electrokit.se/item_list.php?maingroup=Kretskort&secondgroup=Experimentkort

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: December 25, 2010, 07:42:04 am
content: Microchip has some really nice boards for general-purpose prototyping. These boards allow adding pullup, pulldown or series components to each pin.8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board20-Pin TSSOP and SSOP Evaluation Board14-pin SOIC/TSSOP/DIP Evaluation BoardAt first the prices don't look that good...until you realize that the price is for a 5-pack of boards. The first 2 are $10, the 3rd is $20 for a 5-pack.

author: DaveW
author_rank: Frequent Contributor
timestamp: December 25, 2010, 08:53:20 pm
content: If you just want to attach to a chip/use it in a breadboard, these are fantastichttp://uk.farnell.com/roth-elektronik/re901/multiadaptor-epoxied-fr4-sot-23/dp/1172113I use these all the time at work, you can get them for most chips, have used them for 144 pin flat packs.
SMD Buzzer - What's a louder alternative to KLJ-1230 in a similar size? - Page 1
Forum section: electronics / projects

author: monster_of_electronics
author_rank: Contributor
timestamp: February 21, 2016, 11:37:33 pm
content: Any suggestions? I'm looking for a noticeably (to human ears) louder buzzer than the KLJ-1230 without being being more than double the size and 4mm or less in height:http://www.100y.com.tw/pdf_file/48-KLJ-1230.pdfElectrical CharacteristicsOperating Voltage: Max20Vp-pCurrent Consumption: Max 1mA at3Vp-p/Square Wave/4.1KHzSound Pressure Level: Min 83dB at 10cm/ 3Vp-p/Square Wave/4.1KHzElectrostatic Capacity: 16000±30%pF at 1 KHz/1VOperating Temperature (°C): -20~ +70Storage Temperature (°C): -30 ~ +80Dimension: L12×W12×H3.0mmPS: My power supply would be a CR2032 coil cell battery (3v).

author: ruffy91
author_rank: Regular Contributor
timestamp: February 22, 2016, 01:22:38 pm
content: How do you drive the buzzer?Do you use a 4.1kHz square wave?When you're driving it using a square wave and ground you could use an inverter (74xx04 gate) and drive the pins with opposite polarities, to get 6Vp-p from your 3V battery.

author: mikerj
author_rank: Super Contributor
timestamp: February 22, 2016, 01:31:09 pm
content: If you are driving it from a transistor (rather than directly from micro IO pins) you can also put a suitable inductor in parallel with the piezo to provide a voltage step up. Watch out for transistor and piezo maximum voltage ratings though.
SMD common mode choke for 150W offline 230VAC LED driver - Page 1
Forum section: electronics / projects

author: ocset
author_rank: Super Contributor
timestamp: October 08, 2017, 05:27:37 pm
content: Hello,We wish to use the MSD1260T (180uH) common mode choke in our offline 150W linear LED driver.It has a 1W Buck bias supply which is what is causing the common mode noise.We cannot use a through hole common mode choke, because our PCB is all surface mount and cannot tolerate any PTH components due to cost pressure.Do you think the closeness of the coils in the MSD1260T will mean we get emissions passing from one coil to the other and thus not seeing the common mode inductance?MSD1260T common mode choke:http://www.coilcraft.com/pdfs/msd1260t.pdf

author: Cervisia
author_rank: Regular Contributor
timestamp: October 09, 2017, 10:52:37 am
content: When you have common-mode noise, the coils being near each otherincreasesthe effect they have on each other, so the common-mode impedance will be higher, which is what you want.And if you want to know the impedance when used as a common-mode choke, better look at the common-mode choke datasheet:http://www.coilcraft.com/pdfs/msd1260t_cm.pdf

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 09, 2017, 12:14:47 pm
content: "Winding-to-winding and winding-to-core isolation: 500 Vrms"Surely you need at least 1.5kV.Tim
SMD component ID Help - Page 1
Forum section: electronics / projects

author: NikkiC
author_rank: Contributor
timestamp: June 18, 2020, 05:56:17 am
content: Hello,I am trying to identify SMD components.SOT-23-3 marked as "JCSL". Component tester reports this as a N-JFETSOT-23-3 marked as "SP L". Component tester reports this as a P-E MOSPlease refer to the attached photos. Would like to know what the actual components are if possible so as to get their datasheets. Since I don't have to do this often (thankfully), I am finding that SMD component identification is a mine field . Can anyone offer any help?TIA, Nikki

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 18, 2020, 09:11:07 am
content: SP could be BSS84 but the other one I have no idea.

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: June 18, 2020, 09:25:56 am
content: You have almost solved it yourselfIn many cases the last 2 digits or code is date and or location made so just try the 1st letters.JC = STK569, NCh Jfet.http://www.smdmark.com/en-US/smd-code-jc.htmlhttp://www.hotenda.com/marking-code/search/list/JC.htmlhttp://www.s-manuals.com/smd/jchttps://www.web-bcs.com/chips/j/chip_list_j11.htmlSP = P CH mosfet BSS84 though I'm not so sure. The codes don't appear to match.http://www.smdmark.com/en-US/search/code?id=SPhttp://www.hotenda.com/marking-code/search/list/SP.htmlCross check with SMD code books...https://www.sphere.bc.ca/download/smd-codebook.pdfProbably the best site is (as suggested by Dave):https://alltransistors.com/smd-search.phpOnly you can decipher and decide but these will help. From what I can see the JC is that mosfet mentioned though not so sure about the code SP.

author: NikkiC
author_rank: Contributor
timestamp: June 18, 2020, 11:09:02 am
content: QuoteActually they do match.https://datasheet.octopart.com/BSS84-ON-Semiconductor-datasheet-95952793.pdfThank you!. That info has really helped.Nikki
SMD component ID help.   - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: September 20, 2017, 07:55:07 am
content: I'm working on a small power supply charger circuit and am having trouble identifying a part.Its a SOT23-5 package marked "28S"(Edited - I mistakenly put SOT23-6)The overlay designator 'U' suggests its an IC.Pin2 goes to ground.Pin3 is to the battery (could be either charge or discharge).I can't work out what it is. Any ideas?

author: amyk
author_rank: Super Contributor
timestamp: September 20, 2017, 10:10:21 am
content: You mention SOT23-5 and SOT23-6, but I see only 5 pins.How many does it really have?It would also help to trace out where the other 3 pins go.Edit: Might beTPD4E002DRLR(image in link attached for future reference.)

author: DTJ
author_rank: Super Contributor
timestamp: September 20, 2017, 10:56:28 am
content: Thanks amyk.It certainly looks like it is a TPD4E002DRLR.The marking is identical.(I had mistakenly put SOT23-6 rather than SOT23-5).I'm not entirely sure how the TPD4E002DRLR which is a quad TVS diode array fits in the circuit - as I trace it further I guess I will find out.By the way how did you find that information? I was lost.Cheers!

author: scuzzyTerminator
author_rank: Regular Contributor
timestamp: September 23, 2017, 10:06:05 am
content: WOOPS: this is a 4-lead SC82 device.Topmark seems to match the SII S-1335D26-N4T2U3 2.6V LDO -HIGH RIPPLE-REJECTION SOFT-START FUNCTION CMOS VOLTAGE REGULATOR.Datasheet:http://datasheet.sii-ic.com/en/voltage_regulator/S1335_E.pdf

author: DTJ
author_rank: Super Contributor
timestamp: September 23, 2017, 12:06:24 pm
content: I've traced out more of the circuit. I'mpretty certain its a TPD4E002DRLR.Thanks for your help guys.
SMD Component source in the UK with cheap/free shipping? - Page 1
Forum section: electronics / projects

author: Jon86
author_rank: Frequent Contributor
timestamp: December 23, 2013, 10:43:34 pm
content: I'm going to be building a few SMD projects in the following few months, and I need to order a load of passives and connectors etc. I've been looking at RS, Digikey, all the big players, but they all charge ridiculous money for shipping, £12 for a couple of 0402 resistors?! You've gotta be shittin' me!Any recommendations?

author: Monkeh
author_rank: Super Contributor
timestamp: December 23, 2013, 10:45:30 pm
content: Farnell (£3.95 until you pass £20, then free), Rapid (don't recall, free after £30 or £35, very cheap resistors..).

author: Jon86
author_rank: Frequent Contributor
timestamp: December 23, 2013, 11:01:30 pm
content: Looks like it's £4 on Rapid, not too bad I guess, but not great either...Maybe I'll just go the whole way and buy an assorted box of 0805s or something.Thanks anyway

author: KJDS
author_rank: Super Contributor
timestamp: December 23, 2013, 11:45:59 pm
content: There are plenty of people selling reasonable SMD resistor, capacitor and transistor kits on ebay. I'd far rather have a kit about rather than order specific values until I needed to buy a reel.

author: Jeroen3
author_rank: Super Contributor
timestamp: December 27, 2013, 01:10:24 pm
content: eBay has a lot of sellers in the UK.

author: Jon86
author_rank: Frequent Contributor
timestamp: December 27, 2013, 03:44:58 pm
content: Quote from: Jeroen3 on December 27, 2013, 01:10:24 pmI buy almost everything off ebay, but for very small amounts of items, it's not ideal...It's probably what I'll end up doing anyway though.