hybridfree/eevblog-posts huggingface dataset:
Algorithm for calculating LFSR counters - Page 1
Forum section: electronics / projects

author: Forty-Bot
author_rank: Contributor
timestamp: March 14, 2023, 05:45:43 am
content: Inspired bythis post, I've coded up a version of that algorithm in python. It's quite satisfying in its simplicityCode:# SPDX-License-Identifier: Apache-2.0import functoolsimport sysdef logbits(x):b = 0while x:if x & 1:yield bb += 1x >>= 1@functools.cachedef logstep_bit(taps, bit, logsteps):if not logsteps:return (bit < taps) << (bit + 1) | (bit in taps)return logstep_state(taps, logstep_bit(taps, bit, logsteps - 1), logsteps - 1)def logstep_state(taps, state, logsteps):lfsr = 0for bit in logbits(state):lfsr ^= logstep_bit(taps, bit, logsteps)return lfsrdef step_state(taps, state, steps):for logsteps in logbits(steps):state = logstep_state(taps, state, logsteps)return stateif __name__ == '__main__':if len(sys.argv) < 2:print(f"""Usage: {sys.argv} TAPS CYCLES...Calculate the starting state to use with the LFSR defined by TAPS (as aninteger) which will go through CYCLES states before finishing.""", file=sys.stderr)sys.exit(1)taps = tuple(reversed(tuple(logbits(int(sys.argv, base=0)))))max_cycles = (1 << taps + 1) - 1for cycles in sys.argv[2:]:cycles = int(cycles, base=0)if cycles > max_cycles:print(f"Maximum cycles is {max_cycles:#x}, got {cycles:#x}",file=sys.stderr)elif cycles <= 0:print(f"Minimum cycles is 1, got {cycles}", file=sys.stderr)else:state = step_state(taps, max_cycles, max_cycles - cycles + 1)print(f"{taps + 1}'h{state:0{(taps + 4) // 4}x}")Example usage:Code:$ time scripts/lfsr.py 0xD800000000000000 1 0xdeadbeef64'hffffffffffffffff64'h56ca713cb5be9f24real0m0.057suser0m0.057ssys0m0.000sThere's an alternative implementation of this program which stores bits by value (0x10) instead of position (7). It's probably easier to do things that way in C or verilog, but this was more elegant in python.
Alkaline Battery State of Charge - Page 1
Forum section: electronics / projects

author: jag304
author_rank: Newbie
timestamp: March 05, 2018, 04:16:27 pm
content: Hi all - new user here!I've been running some alkaline non-rechargeable experiments for a while to better understand some modeling parameters.Examples of questions I've been working to answer -What effective ESR (ionic and IR drop) can I expect at various states of charge?Since total extracted energy increases as the average discharge rate decreases, what is the final asymptote of available energy? (For a AA Duracell MN1500, this appears to be ~3000mAh or so)So my new question:Let's say I have 2 identical alkaline AA batteries with exactly the same capacity.I intend to discharge both until there is a specific amount of remaining energy available (let's say 100mWh).Let's assume I have a perfect model of the exact energy available in both.I discharge one of the batteries at 10mA constant current and the other one at 1.0A constant current, both until exactly 100mWh remains.Is the open circuit voltage of each of the batteries now identical? Are there other effects of high current discharge which impact the Voc?This is important as we use open circuit voltage to estimate capacity, but also very difficult or impossible to test as you cannot know the available energy remaining until you have depleted the full battery.Looking for any help with this problem!
All about the HP Microserver - Page 1
Forum section: electronics / projects

author: TheBay
author_rank: Unknown
timestamp: December 09, 2013, 02:53:25 pm
content: One of my main projects is anything HP Microserver related, electronically or firmware.I left HP back about 2 years ago, but love these little boxes.I have a simple wiki here:http://microserver.wikia.comIf anyone uses one for a server, lab test bench PC etc, I can answer any questions at all.
all CMOS logic gate inputs have substrate diodes to GND and Vcc? - Page 1
Forum section: electronics / projects

author: floobydust
author_rank: Super Contributor
timestamp: September 07, 2016, 01:30:05 am
content: I thought all CMOS logic gate inputs have substrate diodes to GND and Vcc?Tiny LogicSN74LVC1G14Schmitt-trigger inverter, I find no input diode to the +ve rail. The datasheet only specifies IIK (clamp) -50mA Vin<0, with no mention of Vin>Vcc.My circuit is a Schmitt-trigger inverter for a MCU reset circuit. A cap and pullup on the input, so it's edge triggered. This generates 2xVcc pulse at the inverter's input.Using a 74HC14, I see the substrate diodes clamp, but SN74LVC1G14, it kicks up to 6.6VDCAnyone know why there's no internal diode there, I thought they are part of the CMOS process

author: edavid
author_rank: Super Contributor
timestamp: September 07, 2016, 02:37:46 am
content: Quote from: floobydust on September 07, 2016, 01:30:05 amNo, they are designed in explicitly when desired.

author: amyk
author_rank: Super Contributor
timestamp: September 07, 2016, 10:28:25 am
content: I think you may be confusing the body diode of the MOSFETs with the ESD clamp diodes, the former is naturally present in all bulk CMOS processes but the latter are designed in.Incidentally, this is what they look like:

author: floobydust
author_rank: Super Contributor
timestamp: September 09, 2016, 03:30:09 am
content: I find it's the LVC parts that have no input diode to Vcc. They have one to GND, and rail-rail on their outputs.I think it's because the inputs are 5V tolerant, the optional ESD protection diode for the mosfet gates is omitted.But they still rate the parts ESD 2kV... just not a +ve spikeLesson learned - careful with 5V tolerant CMOS logic

author: edavid
author_rank: Super Contributor
timestamp: September 09, 2016, 03:38:11 am
content: Quote from: floobydust on September 09, 2016, 03:30:09 amGuess what, they did think of that.The input diode to ground is designed to undergo zener breakdown and protect the transistor gates.
All discrete Switching Source - Page 1
Forum section: electronics / projects

author: JuanLarraya
author_rank: Newbie
timestamp: July 14, 2023, 01:06:14 am
content: Hi for a subjet in the university i and my friends did a Switching source with the iron plate method. When we test it the triangle osiclatior doesn't work at the frecuency that we want (200 KHZ) so we make a new circuit in a proto that works, next we saw that the output don't stabilaze at 6.35 V that is the expected tension. we belive that is a problen with the 339 and/or 358 but we really doesn't now why doesn't work, the ouput is stable but not at the voltage we want, for compensation we saw in ltspice and use thehttps://www.edn.com/voltage-mode-control-and-compensation-intricacies-for-buck-regulators/.Observation: the circuit stabilize at 6.35 V when we dont put a charge at the ouput but we need 12.5 ohms at the ouput and when we put this charge the tension fall to 2 V and with 52 ohm the tension fall at 5V with 12V in the input and get the 6.35V with 24 V at the input.Very grateful if someone can help us with this circuit is for a final:https://drive.google.com/drive/folders/10N9JMPp_36wls2B5huhBTEr9brNJUFmd?usp=sharing

author: moffy
author_rank: Super Contributor
timestamp: July 14, 2023, 01:38:06 am
content: Looking at your circuit I don't see the need for R16,R17 being 100R from gate to source, you have push pull driver for the gate. The 100R on the high side will quickly discharge the bootstrap capacitor making the driving of the high side mosfet problematic. resistors in series with the gates around 10R to 20R are a good idea.

author: JuanLarraya
author_rank: Newbie
timestamp: July 14, 2023, 09:45:16 pm
content: This weekend we can't test anything because we don't have the measurement tools, but on Wednesday we're going to the university to test it. Thank you very much for your answer!
All-in Battery Management IC - Page 1
Forum section: electronics / projects

author: Jeroen3
author_rank: Super Contributor
timestamp: October 05, 2020, 06:08:38 pm
content: While researching a lithium battery charger for a project I was having trouble finding suitable chips.Maybe I'm looking for aneierlegende wollmilchsau, but I can't find the all-in-one single cell lithium charger solution I'm looking for.The intent is to use a 14500 unprotected cell for a <100mA load.In 2020, I expected to be able to find a chip from TI or AD with the following features:- Charger- Integrated Powerpath switch.- System On/Off option.- Battery Undervoltage cutoff.- Battery Overcurrent cutoff.So far, I can find protection IC's wit external fets for protection.Chargers with powerpath, but no battery discharge protections.I'm not even looking for a gauge.Is my expectation wrong that there isn't a chip doing all of the above today? Powerbanks often use a tiny board with one chip, what do they skip on?As of right now I've concepted using aMAX8856, attached to anMAX16054for on/off. With aMCP101T-315I/TTto kill it when the battery is dead.Any better options? Or do I need better googling?The project already has quite a complex switcher for +15 and -15, the TPS65130
all in one digital rework station from china - Page 1
Forum section: electronics / projects

author: abe2010
author_rank: Newbie
timestamp: August 21, 2017, 06:22:47 pm
content: I came across this really nice small, compact, all in one station by some guy in china.Main parts are readily available on aliexpress, etc..(for example:https://www.aliexpress.com/item/T12-Soldering-Iron-tips-Hot-Air-Gun-2-in-1-DIY-Electric-Power-STM32-Controller-Combo/32792949661.html?spm=2114.search0104.3.42.StwVUn&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10068_5400011_5430020_5410020_10307_10137_10060_10155_10154_5370011_10056_10055_10054_10059_100031_10099_10103_10102_10052_10053_10142_10107_10050_10051_10172_5380020_10326_10084_10083_10080_10082_10081_10110_10111_10112_5390011_10113_10114_10312_10313_10314_10315_10316_10078_10079_10073_5420011-10050_10102,searchweb201603_16,ppcSwitch_5&btsid=6e9c2124-5676-42c2-a6ec-3dfa97951d21&algo_expid=1f0d5086-8d09-41d3-bec8-ca819d678101-5&algo_pvid=1f0d5086-8d09-41d3-bec8-ca819d678101)but getting it all wired up right is not clearly depictedAnyone who can clearly describe the build process (what to connect to where) is more than encouraged to grant us wisdom.here's a link to the page:http://www.haodiy.net/a/DIYzixun/2017/0722/13275.htmlHere's two pictures I pulled off aliexpress (but the small chinese print isn't legible to me)The really intriguing part is how to wire up the JBC handle, and also how to connect both the soldering iron and the desoldering gun to the same connector while getting the controller to power only one of them at a time.
All-In-One Handheld - Information Request - Page 1
Forum section: electronics / projects

author: WanaGo
author_rank: Regular Contributor
timestamp: July 19, 2011, 10:03:22 pm
content: Hello,At work we are looking for a handheld meter to cover a range of needs we have. This is for an Automation Engineering team, who work on PLC and a range of other industrial equipment/sensors etc.We want a handheld that can be a multimeter, current source, voltage source, can simulate thermocouples and if possible be an oscilloscope too. Basically so we can simulate sensors and probes etc, test connections, voltages and current sources, and also look at data signals to try and determine where noise is being injected etc.Whether such a device exists, I have no idea.We were looking at the Fluke 725 calibrator, which does cover a range of the things we require, but I was wondering if anyone has seen/used another brand which might do a similar thing and maybe have an oscilloscope too?There is the Hantek 5 in 1 device which does a few things, however again not everything required.It may just be a case of needing 2 devices, but I thought I would ask the question anyway.We would be happy to spend up to $5000US at a guess.CheersWanaGo

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: July 20, 2011, 12:14:48 am
content: I think that Agilent have an similar device.U1401A/U1401B hand held multi-function calibrator/meterNo idea about specs for direct comparison with the Fluke or any other.But you can investigate it by your self.
All USB ports are ”working” but still do not recognize plugged in devices - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 23, 2023, 05:51:54 am
content: HP Pavillion, desktop, 10-12 years old.Device manager and other tools say all USB devices work.5V is available on the outputs.BUT,when USB devices are plugged in, they are not found, nothing happens.EXCEPTION: One port sometimes works, but inconsistently.I have uninstalled all drivers.I have deleted the USB history.The drivers reinstall themselves on the next boot, but the problem persists.All drivers are claimed to be the of latest versions.Any ideas on how to proceed?

author: moffy
author_rank: Super Contributor
timestamp: April 23, 2023, 06:40:14 am
content: A clean reinstall of the OS, it's the next logical step. Good luck.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 23, 2023, 12:43:12 pm
content: Does it work in live Ubuntu?

author: Stray Electron
author_rank: Super Contributor
timestamp: April 23, 2023, 12:47:56 pm
content: Maybe this is a dumb question, but are you sure that your ports aren't just 2.0 or less and the devices require 3.0? Have you tried your devices on another computer or other known-good USB devices on this computer?

author: wasedadoc
author_rank: Super Contributor
timestamp: April 23, 2023, 01:02:09 pm
content: Plug in an optical mouse. Does its LED turn on?

author: AndyBeez
author_rank: Frequent Contributor
timestamp: April 23, 2023, 01:47:41 pm
content: Pondering...Do the drivers reinstall on every boot?Have you tried using a self powerd usb hub?Is there any "usb disable" setting on the pre-boot bios page? Corporate pc's used this feature to stop employees copying stuff to usb pendrives.Also, is there a smart media card reader, as this might also be connected to the usb bus?

author: kjr18
author_rank: Regular Contributor
timestamp: April 24, 2023, 08:25:16 am
content: I think that all your problems are more hardware like. Probably usb sockets are so worn out they don't make good enough electrical connection for it to work. If you observe same problems with ubuntu or any other live linux distro, probably sockets are loose, or even solder joints might be cracked.
AllDataSheetFinder - utility for downloading and organizing datasheets - Page 1
Forum section: electronics / projects

author: Symeg
author_rank: Newbie
timestamp: June 29, 2015, 09:39:40 am
content: Hi!Last days i've been working on this app.It is an utility for finding, downloading and organizing datasheets from alldatasheet.com. Application have also ability of organizing own datasheets - not downloaded from alldatasheet.com.Once you download datasheet, it is stored in cache and can be deleted when cache limit exceeds. You can add it to favourites to prevent from removing. Manufacturers logos are downloaded only when they are needed and stored locally.Need .NET Framework 4.5 and any PDF browser to run properly.Link to latest release:https://github.com/SzymonKatra/AllDataSheetFinder/releases/latestScreenshots:http://szymonkatra.github.io/images/project/alldatasheetfinder/screenshot_1.pnghttp://szymonkatra.github.io/images/project/alldatasheetfinder/screenshot_2.pngPlease for feedback.
Allegro A1334 Hall Effect Angle Sensor - Programming Reference/Guide? - Page 1
Forum section: electronics / projects

author: robert67
author_rank: Contributor
timestamp: June 12, 2021, 11:20:42 am
content: Hi everybody,I've picked up some Allegro A1334 Hall Effect Angle Sensors at DigiKey. They were real cheap, 'cause they're obsolete. Allegro lists them as "last buy", but DigiKey has still over 1,000 in stock, so why not.I do have of course the datasheet, but that only describes the electrical properties of the A1334's SPI interface. Whenever it comes to actually talking to the chip via SPI it refers to an "appendix Programming Reference".And I can't find that A1334 programming reference anywhere. I really searched everywhere (including Allegro's website of course). But the best hit I've ever got is the "A1335 Programming Manual" (A1335-Programming-Manual.pdf).I don't know if Allegro hides that A1334 programming reference by purpose ('cause the chip is obsolete).If anybody has the A1334 programming reference, could you please upload it here or post a link to it.Pretty please!

author: dmendesf
author_rank: Frequent Contributor
timestamp: June 12, 2021, 02:41:11 pm
content: Found the A1335 programming manual:https://www.allegromicro.com/-/media/files/programming-manuals/a1335-programming-manual.ashxMaybe it helps...

author: robert67
author_rank: Contributor
timestamp: June 13, 2021, 08:12:02 am
content: Thanks! I've stumbled upon that one too. While I'm convinced they didn't reinvent the wheel (meaning the interface is probably very similar to the A1334), I really need to be sure to write exactly the right bits in the EEPROM (it's specified for just 10 write cycles or so), so experimenting is kinda out of the question.
allelectronics.com closing their doors :( - Page 1
Forum section: electronics / projects

author: gubezon
author_rank: Contributor
timestamp: July 10, 2023, 05:26:55 pm
content: Sad news:ALL ELECTRONICSIS GOING OUT OF BUSINESSClearance Sale in ProgressAfter 56 years supplying surplus and new electronic parts and supplies, we have decided to call it quits. We expect to close our doors before the end of August, 2023. Our warehouse still contains lots of material which we need to move. Take advantage of our final clearance sale. This is the time to get some real bargains.Another good source for one-off surplus widgets going away.I probably ordered from here once or twice a year, especially when "interesting" stuff appeared in their inventory.Oh well. Will miss their site.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 10, 2023, 06:57:55 pm
content: R.I.P

author: james_s
author_rank: Super Contributor
timestamp: July 10, 2023, 06:58:00 pm
content: Well that's too bad, I've been ordering stuff from them since I was a kid and finally visited the store a few times several years ago, funny thing is they still had a few odds & ends on the shelves that I remembered seeing in the catalogs when I was a kid. I suppose the end should come as no big surprise though, it's been a while since I've found anything compelling to order from them, they'd started stocking a fair amount of the same Chinese widgets that are a fraction the price on aliexpress and such.
Allen Bradley PLC Programming Cable - Page 1
Forum section: electronics / projects

author: Squarewave
author_rank: Frequent Contributor
timestamp: December 12, 2023, 08:26:34 pm
content: Hello chaps.I have removed from some old equipment, some Micrologix 1000 and 1100 PLCs. They traditionally use the programming cable which has a 9 pin D plug on one end and the mini din on the other end. Has anyone here got any successful experience of using a mini din to USB serial cable?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 12, 2023, 10:24:58 pm
content: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1761-um003_-en-p.pdfpage 62

author: Squarewave
author_rank: Frequent Contributor
timestamp: December 29, 2023, 03:35:10 pm
content: I guess not then, or no one here. I'm probably best just getting a USB to RS232 converter and going on from there.
Allowable On/Off times vs. current for a multiplexed LED Display.  - Page 1
Forum section: electronics / projects

author: Electr0nicus
author_rank: Regular Contributor
timestamp: October 31, 2013, 11:16:41 pm
content: HiI have a 7- Segment LED Display (green). In the datasheet is noted:max. Peak Forward Current 160mAwith a footnote that says: Dutycycle 1/10 max. on- time 0.1ms.I have no problem understanding that spec for 1/10 Duty-Cycle, but what is if I only use a 1/4 Duty-Cycle and only 80mA max. current. Can I then increase the max. on time proportionally, so in this case half the max. peak current and double on-time (0.2ms)?Kind regardsGregor
Alpha Omega Semiconductor any information - Page 1
Forum section: electronics / projects

author: tszaboo
author_rank: Super Contributor
timestamp: October 21, 2013, 12:24:14 pm
content: Has anyone any experience with Alpha Omega Semiconductor? They are relatively new to the market and I'm not sure how I feel about them. I design stuff which will be produced 10 years from now, industrial stuff, and they already have NRND and obsolete parts. On the other hand, they have FETs (high current) which are way cheaper than the brand parts. And most of their stuff is package/pin compatible with them. Are they one of the companies only good for consumer market, or should I give them a go?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 21, 2013, 12:52:40 pm
content: I've used their DC-DC converters - very cheap -only minor concern is only Digikey seem to stock them, so if out of stock you may be screwed. Richtek also has a range of cheap DC-DCs, with a similar igikey-only situation.Can't comment for scheduled orders/ long leadtime orders.

author: tszaboo
author_rank: Super Contributor
timestamp: October 21, 2013, 05:16:06 pm
content: Looks like Arrow has them also, some of the components are in 100.000s. I guess, it could not hurt, to use them as "compatible", with a vishay or ST as backup. That would make the pointy haired boss happy. just kidding. I have an awesome boss.

author: AndyC_772
author_rank: Super Contributor
timestamp: October 21, 2013, 05:28:21 pm
content: I've used them and have no reason to doubt their quality. They openly admit that their target markets are high volume products, and they're not looking to take on the larger brands in terms of the breadth of their range.They may well have a local sales office in your area who will provide tech support and samples - mine (in the UK) was very helpful.
Alpha V1, an Open-Source Arduino Compatible Remote Controller (not just a PCB) - Page 1
Forum section: electronics / projects

author: alireza.safdari
author_rank: Newbie
timestamp: April 09, 2019, 05:16:38 pm
content: Over the years (since 2013) we always wanted to have an open source and modifiable remote controller for robotics applications. Since we could not find one in market, we would end up building one remote controller for each robot. We were in the second year of university and kind of newbie, so we never thought about making one controller that can adapt to all projects. Years later in 2017, we decided to do something more than our jobs, so we decided to build a remote controller that is open source and it can be adapted to various projects.After a lot of brain storming we madeAlpha V1:The hardware is:1) Xbee2) Arduino Mega based board (using Atmega 2560)3) RA6963C LCD driverThe important features:1) Let you connect any switch or analog device to the main board and all you have to do is defining them in the menus.2) Using laser cut top and bottom plate for easy modification by users and even cutting new ones if needed.3) 3D printed friendly shell, so that users can 3d print theirs4) Almost all features of normal RC transmitters5) By giving up latency you can transmit more channels. The our of the box performance would be 18 channels 100Hz but can be set to 36 at 50Hz or even 72 at 25Hz.6)readable open source codeto be honest we spend a lot of time to make it easy for new people to understand it.We are planning to crowdfund this remote controller but we still do not have enough traction. So I posted this here to seewhat you thinkand if there is afeature which you think can make our remote controller more interesting? Also if you know someone who could be interested in this, please do let them know.Alpha V1 on our website:https://www.craetech.com/alpha-v1Our project page with many pictures on Hacker.io:https://hackaday.io/project/164523-alpha-v1-open-source-remote-controller
[solved] Alps joystick gets stuck - Page 1
Forum section: electronics / projects

author: Watth
author_rank: Frequent Contributor
timestamp: October 22, 2023, 11:40:41 am
content: Hello EEVfolks!I purchased two dozen ALPS Alpine joystick (Multi-Directional Switches)RKJXV122400Dmore info.The issue is that the lever gets stuck when pushed to the extreme position, whether it is up, down, left, or right. Is some case, the return spring manages to bring the lever back to center.So I am wondering if the parts are defective, or if it is expected when the part is new, or if my design is supposed to prevent the user from pushing it to the extreme position, that is blocking the lever a few degrees from the max.I have recently enquired to Alps Alpine (not yet to the seller, LCSC) and hope for an answer, but being an individual, don't have high hopes for a prompt reply.Does anyone here have any experience with this type of product?Thanks for reading !

author: coromonadalix
author_rank: Super Contributor
timestamp: October 22, 2023, 12:48:46 pm
content: the plastic must be seizing on themself ... until it may or will wear a biti would try if you have one to spare, teflon grease, or any grease (non based petroleum)just put a smal dab on the slider tracks

author: BrokenYugo
author_rank: Super Contributor
timestamp: October 22, 2023, 03:00:20 pm
content: Near the top of page 2 of the datasheet provided it seems to suggest the stick should not exceed 23 degrees of travel from vertical or "bad operation feeling will be occured".

author: Watth
author_rank: Frequent Contributor
timestamp: October 22, 2023, 04:21:12 pm
content: Quote from: BrokenYugo on October 22, 2023, 03:00:20 pmYou are right. I read to fast (diagnosed ADHD!) and missed that part. I'm planning on 3D printing thumb thingies, I'll try to include proper geometry to not exceed these damned 23°!

author: aeberbach
author_rank: Regular Contributor
timestamp: October 22, 2023, 08:35:02 pm
content: Did you get them from a place that is likely to have genuine parts or could they be fake?
ALPS Pot Model Numbers - Page 1
Forum section: electronics / projects

author: eddy66t6
author_rank: Contributor
timestamp: May 06, 2016, 04:03:45 pm
content: Anybody know the difference between the alps RK12L and RK12K series of pots? Trying to find a replacement part for a k, but only l seem to be available, trying to figure out if their a replacement...Thanks

author: ajb
author_rank: Super Contributor
timestamp: May 06, 2016, 05:44:47 pm
content: Do they actually make an RK12K? There's an RK11K listed on the website, which of course is a different size. Do you have a pot that's marked RK12K, or is that just what's on the parts list?

author: eddy66t6
author_rank: Contributor
timestamp: May 06, 2016, 06:49:40 pm
content: yeah its the part number in the service manual and its marked on the pot the board is circa 1986 though, but it seems logical that the next model along would be the L, and all the other pot parameters are in different sections of the part number, just dont want to order them in and find they wont work...

author: ajb
author_rank: Super Contributor
timestamp: May 06, 2016, 08:08:08 pm
content: Usually PC mount pots are more or less standard form factors across multiple manufacturers (though some manufacturers have different combinations of options off the shelf than others do), so as long as you know the value and curve and can match the form factor you should be fine.
Alternate part,  diode question - Page 1
Forum section: electronics / projects

author: rmacintosh
author_rank: Regular Contributor
timestamp: June 06, 2013, 07:28:05 pm
content: Can anybody take a look and confirm that either of these replacement parts would be suitable?Original part HER205http://www.datasheetcatalog.org/datasheet/wte/HER203-t3.pdfAlternate part EGP20Ghttp://www.vishay.com/docs/88583/egp20a.pdfOrAlternate part NTE580http://www.nteinc.com/specs/500to599/PDF/nte580.pdfI can't source out the original. I also keep getting pointed to NTE576 but that diode has too large of a package size. I need DO-15 or similar sizeThanks

author: c4757p
author_rank: Super Contributor
timestamp: June 06, 2013, 07:33:37 pm
content: HER205. The URL is case sensitive.They both look acceptable to me. EGP20G is a bit closer to the original - what exactly was the application of the original part?

author: rmacintosh
author_rank: Regular Contributor
timestamp: June 06, 2013, 07:43:03 pm
content: Two of these diodes form a diode modulator which is part of a horizontal size circuit in a tube monitor
Locked - Alternative Chip for USB-Serial - Page 1
Forum section: electronics / projects

author: oakkar7
author_rank: Contributor
timestamp: December 03, 2014, 03:57:18 am
content: Dear All,After FTDI screws many users, we need to find alternative chip for USB-Serial.https://www.eevblog.com/forum/reviews/ftdi-driver-kills-fake-ftdi-ft232/msg557484/#msg557484I don't think FTDI will walk away this. Before they flame another war, we (all opensource, hobby and even for commercial crews) should find another way to do this.So, pls share your thought, list all USB enable solutions, chips and what ever you think about it.There are many solutions such as Prolific chip, V-USB and also native usb buildin chips. Share every thing here also about license, driver stability etc.As a starting point, someone shares about CH430G here, alternate china chip.http://fobit.blogspot.gr/2014/11/ch340g-in-eagle.htmlCheers,

author: amyk
author_rank: Super Contributor
timestamp: December 03, 2014, 06:52:29 am
content: https://www.eevblog.com/forum/reviews/alternatives-to-ftdi-usb-to-uart-converter/

author: oakkar7
author_rank: Contributor
timestamp: December 04, 2014, 07:58:52 am
content: Hi,Thanks Amyk and DiligentMinds.Dear Admin, pls lock or delete thread to avoid duplicate.Thanks all,
Alternative for Broadcom ASSR-V621-300E - Page 1
Forum section: electronics / projects

author: perdrix
author_rank: Frequent Contributor
timestamp: December 10, 2023, 09:27:32 am
content: Can anyone suggest a cheaper alternative for Broadcom's ASSR-V621-300E Dual Channel Photovoltaic MOSFET Driver?Things get a bit spendy when you need 8 of them!And if there's any 4 channel equivalents, I'd love to hear of them.ThanksDavid
Alternative for IRFP240/250/260 in TO-220 package - Page 1
Forum section: electronics / projects

author: prasimix
author_rank: Unknown
timestamp: March 13, 2020, 11:32:39 am
content: I'm looking for n-ch MOSFET with SOA similar to IRFP240/250/260 (TO-247) but in TO-220 package. I don't need it as a switch but to work in linear region as pass/series voltage regulator that has to step down no more then 5 V. What you would recommend?

author: Kleinstein
author_rank: Super Contributor
timestamp: March 13, 2020, 11:52:36 am
content: One could use some higher voltage MOSFETs, especially old type. The IRF840 is at least in the Fairchild version specified with power limited SOA.The permissable power may still be a little lower than for the TO247 case - just a question of the case size.

author: prasimix
author_rank: Unknown
timestamp: March 13, 2020, 11:56:10 am
content: Thanks Kleinstein, the total power dissipation should not exceed 15 W, and thermal control will be implemented coupled with forced cooling using fan.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 13, 2020, 12:27:20 pm
content: For so little power, one could get away with a smaller MOSFET like IRR820.If in doubt Infineon FETs are a good choice - the transistors may not be better, but the data-sheets usually have a reasonable SOA curve and not a fake one ignoring the thermal instability.

author: Vovk_Z
author_rank: Super Contributor
timestamp: March 13, 2020, 09:04:33 pm
content: Quote from: prasimix on March 13, 2020, 11:56:10 amThere is definitely no need in TO247 case for 15W dissipation. A lot of TO220 case mosfets will do.For example, popular low voltage devices are IRF3205, IRF3206 etc.

author: prasimix
author_rank: Unknown
timestamp: March 14, 2020, 10:10:50 am
content: Thanks, I'll give a try to some of OnSemi devices, such as FQPF19N10 or FQPF33N10L that have DC specified in SOA and that are even suggested for audio amplifier applications.
Alternative for TLV76033 voltage regulator? - Page 1
Forum section: electronics / projects

author: ebastler
author_rank: Super Contributor
timestamp: September 15, 2021, 04:05:47 pm
content: A while back I designed a PCB which -- among many more specialized components -- uses a TLV760 voltage regulator, fixed 3.3V version, in SOT-23 package. And now this trivial linear regulator is that part with the longest lead time; Mouser just pushed it out from December to February.When I designed it in, I did not realize that SOT-23 regulators are made in pretty much all of the six conceivable pinouts. And it seems that the pinout TI chose for the TLV760 (see below) is one of the more exotic choices.I have not been able to find a direct replacement. If anyone is aware of an option, I would be much obliged! SOT-23 with the "TI pinout", 3.3V fixed output (from 5V input), 50 mA would be more than enough. Thanks!

author: Bibbbi
author_rank: Newbie
timestamp: September 15, 2021, 06:38:21 pm
content: TLV76033DBZRLDO Voltage-Regulator 3.3V 100-mA, 30-V, SOT-23-3https://www.ti.com/lit/ds/symlink/tlv760.pdfLM3480IM3X-3.3/NOPBLDO Voltage-Regulator 3.3V, 100-mA, 30-V, SOT-23-3https://www.ti.com/lit/ds/symlink/lm3480.pdf

author: ebastler
author_rank: Super Contributor
timestamp: September 15, 2021, 07:00:10 pm
content: The TLV76033DBZR is what I have (or rather, would like to have...). Unfortunately they seem out of stock everywhere and TI has looong lead times for them.But the LM3840 is a great find, thank you! Mouser does not have them in stock either, but they are expected much earlier, in September and October. And I have not looked elsewhere yet, so maybe I will get lucky right away. Thanks!
Alternative for TVS Diode - UCLAMP3301D / Ethernet Prototection.  - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: September 11, 2017, 06:42:11 am
content: Im currnety using semtech UCLAMP3301D TVS diodes to provide Transient protection for an ethernet PHY, that is part of a POE setup. The Diodes protect the phy from large spikes when the cables are disconnected. These Diodes however are quite expeneive and i use four for each port.I'm looking for some snesible alternative. I could use a packaged part if it is sensible.http://www.semtech.com/images/datasheet/uclamp3301d.pdf

author: tszaboo
author_rank: Super Contributor
timestamp: September 11, 2017, 08:14:49 am
content: I guess one of these? For high speed ports, the 4 parameter needed ispackagecapacitancevoltageunidirectional or bi-https://www.digikey.com/products/en/circuit-protection/tvs-diodes/144?k=&pkeyword=&pv566=567&pv566=604&pv566=303&pv566=305&pv566=399&pv566=400&pv566=432&FV=4027c4%2Cffe00090%2Cbe40166%2Cbe40004%2C1f140000&mnonly=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=500NXP is not on stock, but a lot cheaper, ON semi is the best if you can order the QTY. Or discuss a better deal.

author: Blinkenlights
author_rank: Contributor
timestamp: September 12, 2017, 03:37:22 am
content: Checking out the data sheet, the uClamp3301D has pretty amazing characteristics. At 3.5V: 2ua, at 4.5V: 1A (that's impressive) 50pf and 0.33US/pc in reel qty. I have not had to research a TVS with these specs recently, but at first glance I think you are getting what you pay for, easily.

author: mrpackethead
author_rank: Super Contributor
timestamp: September 12, 2017, 04:40:17 am
content: @Blinkenlights.. it certainly seems they have got an edge on everything else i've looked at. They work very well, and touch wood, they have keep the devices working.. But we are always in a quest to reduce price.http://www.onsemi.com/pub/Collateral/ESD8351-D.PDF?Its got a clamping voltage that is nearly as low as the Uclamp3301D.. ( 11 vs 9.5V )..its 1/4 of the price of the Uclamp3301DI started looking at some packages as well;http://katalog.we-online.com/pbs/datasheet/824013.pdfhttp://www.littelfuse.com/~/media/electronics/datasheets/tvs_diode_arrays/littelfuse_tvs_diode_array_sp3304n_datasheet.pdf.pdfLittlefuse as a good selection of devices...
Alternative Molex SL Hand Crimp Tool - Page 1
Forum section: electronics / projects

author: DaAwesomeP
author_rank: Newbie
timestamp: November 30, 2020, 05:51:11 am
content: Hello everyone!Someone I used to work with had a hand crimp tool that crimped Molex SL crimps. It wasn't a really cheap and one and it wasn't the$360 USD Molex one. It locked-in and held the crimp for you and actually crimped properly instead of just smushing the crimp like the really cheap ones do.When I looked some more, I thinkthis might be it(sadly no longer made). Does Molex only make that one expensive tool now? Does anyone know of an alternative?There is alsothis other toolthat says it is compatible with C-grid SL, but not SL. Will it work?This is purely for hobbyist/prototyping so nothing needs to be to spec.Thanks and happy holidays (if you celebrate)!PerryEDIT: I should note that I'm not locked-in to using the Molex SL; if there is something else from another manufacturer that is 2.54mm pitch and has a nice locking latch then that works too!

author: poorchava
author_rank: Super Contributor
timestamp: December 01, 2020, 08:25:18 pm
content: I would try crimpers from Engineer company. Japanese stuff, very good quality. As is typical of japanese companies - 90s era website. (Hello JST...)Sadly, they mostly crimp only one section at s time, so each crimp requires you to use 2 separate recesses in the crimp die one after another. I can see them used only for prototyping work. This is just too slow for even a low volume production.

author: davidb
author_rank: Contributor
timestamp: December 01, 2020, 10:16:01 pm
content: I use this one with Molex 150L pins. It's inexpensive, but it workssurprisinglywell.https://www.pololu.com/product/1928

author: Paroidia
author_rank: Contributor
timestamp: June 08, 2022, 07:50:40 am
content: Putting this here in case anyone searches it later.Search ebay for HTR 8519B, it's an ancient out of production SL crimp tool that's lost to time enough that the seller usually doesn't know what he's got and you can often get one for under $100. Even Molex's site doesn't have any documentation on it, I found a cross reference to a newer tool which in turn had a reference to the current in production SL hand crimp tools which is how I figured this out. There are two revisions one is more squarish than the other but they both have the same model number.
Alternative til Multi Contact A-SLK4-RG ? - Page 1
Forum section: electronics / projects

author: SirJMD
author_rank: Contributor
timestamp: July 01, 2016, 07:34:02 am
content: Adapter in question:http://au.rs-online.com/web/p/4-mm-test-plugs-sockets/7260697/It's crazy expensive for something so simple. I've found them as "low" as 4 USD/piece, but I still feel that it's much more expensive than it should have been.So question is, does any of you know of a similar product but cheaper? I need about 50 of them.

author: SirJMD
author_rank: Contributor
timestamp: July 04, 2016, 08:14:22 am
content: No one?

author: Jeroen3
author_rank: Super Contributor
timestamp: July 04, 2016, 09:28:41 am
content: It's a banana plug extender with a bend?Doesn't look like something a lot of people need. Therefore it will be a custom limited production product. Which makes it expensive.
Alternative to 13MHz-27MHz isolator/circulator? - Page 1
Forum section: electronics / projects

author: Plasmateur
author_rank: Regular Contributor
timestamp: July 29, 2017, 05:21:02 pm
content: Hello,I'm having a hard time finding different options for an isolator for HF (2-30MHz).I'm unsure how this device,https://www.amazon.com/MFJ-Enterprises-Original-MFJ-915-Isolator/dp/B009AECB4Kwhich is referred to as an isolator. Where would the reflected power be dumped to?Are there other techniques used to dump reflected power (around 200Watts), for these frequencies?

author: DaJMasta
author_rank: Super Contributor
timestamp: July 29, 2017, 07:29:10 pm
content: What you've linked claims to be a balun, so it being an "isolator" means you are transformer isolating both sides (no shared ground), not that you are acting like a circulator.200W of reflected is pretty substantial though.... don't really have any experience with such high power devices/systems myself.
Alternative to APW7137 - Page 1
Forum section: electronics / projects

author: fx991ex
author_rank: Contributor
timestamp: November 15, 2018, 07:28:33 pm
content: I need to replace APW7137 regulator from ANPEC on a circuit. The regulator is hardly available. Is there an alternative that I can use?Datasheet:http://pdf1.alldatasheet.com/datasheet-pdf/view/250080/ANPEC/APW7137.html

author: t1d
author_rank: Super Contributor
timestamp: November 17, 2018, 05:10:35 am
content: Contact the manufacturer and ask them for dealer information:http://www.anpec.com.tw/Contact.aspx?lang=en

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 18, 2018, 04:36:05 am
content: The LT1935 seems a pretty close fit and is pin-to-pin compatible:https://www.analog.com/en/products/lt1935.htmlThe feedback voltage is slightly higher though (typical: +2.8%), so you may have to tweak the feedback resistors' values depending on the voltage output accuracy you're targetting.

author: wraper
author_rank: Unknown
timestamp: November 18, 2018, 05:09:49 am
content: MIC2288 would do the job.https://eu.mouser.com/datasheet/2/268/mic2288-778719.pdf. You could also use TPS61040-Q1http://www.ti.com/lit/ds/symlink/tps61040-q1.pdfif it's not heavily loaded.
Alternative to LTM2886 Logic Isolator with none BGA package  - Page 1
Forum section: electronics / projects

author: mnni
author_rank: Newbie
timestamp: January 13, 2021, 03:22:16 pm
content: looking to isolate from main DGND.Any IC out there that comes with a none BGA package that can be hand soldered ?I need to support spi and power a DAC and speed is not a great need.any recommendations ?

author: pigrew
author_rank: Frequent Contributor
timestamp: January 13, 2021, 03:37:24 pm
content: Linear Tech also makes the ADUM5401 isolator, in a SOIC package. It's fully integrated, but only can output 500 mW.How much power do you need to drive? If more, they also sell isolators that use external transformers.In the past, I've used CUI-branded DC-DC converter for power along with separate GMR-based digital isolators.

author: mnni
author_rank: Newbie
timestamp: January 14, 2021, 02:13:55 pm
content: Great it looks like it will do the tricknot sure why i did not find the ADUM5401 when i did my part search on analog.comwill be using it to drive only a AD5761R for nowThanks for pointing me in the right direction
alternative to MAX40200 - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: April 06, 2019, 07:41:40 pm
content: Any suggestions for an alternative for a max40200 which is an ideal diode used in a battery backup for a low voltage/low currnet circuit.

author: ThomasDK
author_rank: Regular Contributor
timestamp: April 06, 2019, 07:51:29 pm
content: A mosfet?You need to make it clear what you are trying to do...

author: mrpackethead
author_rank: Super Contributor
timestamp: April 06, 2019, 08:39:59 pm
content: I have a low power circuit, it has duty cycle of about .02% where it pulls 70mA. the rest of the time it is around 3uA. Nominal power requirement is a Vdd of 3.3VThe primary power source will be a USB 5V supply. ( because they are everywhere ). THe backup power supply will be some AA Alkaline batterys ( probably 2 ) which i'll connect via a DC/DC converter ( Alkaline cells start at about 1.6V, and end of useful life is at abogtu .8V, so you do reallyu need to convert )
Alternative to MCP4725? - Page 1
Forum section: electronics / projects

author: echen1024
author_rank: Super Contributor
timestamp: September 19, 2013, 02:54:41 am
content: Well, I have a TI account, so I might as well just ask. What would be the closest alternative to the Microchip MCP4725 DAC. I will use this as the voltage control loop of a Linear PSU.

author: Unknown
author_rank: Unknown
timestamp: September 19, 2013, 08:17:43 am
content: Figure out which specs are important, put this in a parametric search, and find the cheapest suitable part. Dave has done avideo about this.

author: dannyf
author_rank: Super Contributor
timestamp: September 19, 2013, 11:22:21 am
content: QuoteThe answer depends on how the chip is used. If you used some particular attributes of that chip, it would be harder to find replacement. Otherwise, it is just a dac - aka too many alternatives to list.
Alternative to std Molex for Discrete Wire to PCB in high vibration setting? - Page 1
Forum section: electronics / projects

author: Spere
author_rank: Newbie
timestamp: May 08, 2015, 07:17:03 am
content: Looking for suggestions to the standard molex connectors for use in higher vibration environment.Application Notes:Location: In vehicle passenger compartment, inside housing - dust/moisture/etc. contamination not an issueSpecific Usage: Connecting housing mounted LCD to PCB & user input switches to PCB.Max 20 volts (normally a typical 14.6-14.8 )Max 100 mA per pin (generally much less)Will be using several variants from 2 to 8 pin.I've used the standard Molex connectors with pretty good success in the past, but want something with a more positive (anti-vibration) connection and would appreciate real world experiences.Reason: I have had the molex pairs separate in the past after prolonged vibration -- it's annoying...Will likely be purchasing from DigiKey with other parts.Items previously used:http://www.digikey.com/product-detail/en/22011052/WM9143-NDhttp://www.digikey.com/product-detail/en/0022041051/WM18788-ND/403318Thanks!

author: m98
author_rank: Frequent Contributor
timestamp: May 08, 2015, 04:38:32 pm
content: The Hirose DF13 seem to work reliable in model airplanes, but I don't have any experience with them.

author: Monkeh
author_rank: Super Contributor
timestamp: May 08, 2015, 05:00:43 pm
content: JST PHare pretty secure IME, and thePNDseries has a lock on it. Digikey keep both.Also PA, PLI, PNI..

author: luky315
author_rank: Regular Contributor
timestamp: May 10, 2015, 12:20:35 pm
content: Samtec is expensive, but reliable.https://www.samtec.com/picturesearch/I used their 1,27mm "Tiger Eye" contacts in similar applications.

author: calexanian
author_rank: Super Contributor
timestamp: May 10, 2015, 05:34:35 pm
content: I would have recomended Panduit MASCON connectors like we use in production, however the company has become difficult to work with as of late. I would recommend the TE brans MTA series of connectors. They come in a .100 and .156 series. We use both and have had good luck. They are every bit as good as the Panduit product and light years ahead of the old style molex connectors. The male headers come available in a locking polarized version as well. The wire gauge for the female side is indicated by the color of the body. Red for 22ag, etc.. Also you will need the T handle to properly set the wires. They also have a pistol grip gun available in the various sizes. They are a bit expensive, but if you are going into production you will want one. For small quantities the T handle is fine.http://www.digikey.com/product-detail/en/3-640428-5/A31231-ND/696811