hybridfree/eevblog-posts huggingface dataset:
Encoder Counting - Page 1
Forum section: electronics / projects

author: holographicpencil
author_rank: Newbie
timestamp: September 17, 2018, 02:39:25 am
content: Hi everyone,Not sure if this is the correct place or not but here goes,Looking for some way of using a pulse up/pulse down encoder to output an analog voltage. Is there a simple way of doing this with some sort of IC or is this a more complicated undertaking?Jack

author: DaJMasta
author_rank: Super Contributor
timestamp: September 17, 2018, 02:46:05 am
content: What is your voltage representing?If just activity or speed, you could use a low pass filter with a bleeder resistor.If you actually want a counter, you could plug the encoder pulse into a 74 series counter of however many bits and configure the outputs as an R2R ladder DAC.

author: holographicpencil
author_rank: Newbie
timestamp: September 17, 2018, 02:55:07 am
content: Thanks for that,I literally just want a 4 position rotary switch but it needs to reset to the zero position when the power is cycled so a mechanical rotary switch is not the best option for this.Does that make it clearer?Jack

author: oPossum
author_rank: Super Contributor
timestamp: September 17, 2018, 03:10:30 am
content: I don't know of anything with 4 steps, but this will do 64...http://ww1.microchip.com/downloads/en/DeviceDoc/20001978D.pdf

author: DaJMasta
author_rank: Super Contributor
timestamp: September 17, 2018, 03:45:13 am
content: Is it a quadrature encoder? If so, you can use the two signals to read the quadrant exactly, so you could just get some logic gates and get your four output signals (or convert them to differing voltages or whatnot).

author: Smokey
author_rank: Super Contributor
timestamp: September 18, 2018, 06:38:52 am
content: Simple with a micro and DAC.If if has to be processor-free, how about feeding the encoder pulse output into a ripple carry counter which addresses a parallel input DAC?[] DaJMasta already suggested essentially the same thing.
Encoding 10 Buttons and generating an output - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 04, 2018, 09:19:39 am
content: I'm very confused on how to approach this... and would appreciate some pointers...I have a requirement to encode ten buttons and then to generate an edge which causes another circuit to come back and read an 8-bit latch which should contain the encoded... i.e. 0000000 to 00001010 value for the button pressed. The keys probably need to be de-bounced too. Only the last button press matters.Is there anything 74 series to help with this?Thanks

author: Ian.M
author_rank: Super Contributor
timestamp: May 04, 2018, 10:25:50 am
content: There used to be ICs for this e.g the74C922. You'll have difficulty finding anything still in production, but if you are doing a one-off or *very* small volume you may be able to find some N.O.S.Otherwise its a whole mess of logic or a programmable chip, either a CPLD or small FPGA or a MCU.If you go down the mess of logic road, the basic strategy is a pair of cascaded 74xx148 8-3 Line Priority Encoders, with EI of the high encoder grounded and its EO as EI to the low encoder and as output A3. The low encoder's EO output will go high when any key is pressed, The two sets of A0-A2 outputs must be combined in AND gates to get A0-A2 from both encoders. If you want a low going strobe you can also AND the two GS outputs together. Then you need a retriggerable monostable for debouncing, triggered by either low E0 or the combined strobe, and a 4 bit latch to capture A0-A3 when the bouncing has stopped. You can then present the latched key number + a strobe derived from the monostable to the rest of your circuit. The absolute minimum is going to be five ICs, even if you don't need any glue logic for the output interface.

author: sokoloff
author_rank: Super Contributor
timestamp: May 04, 2018, 10:30:22 am
content: Quote from: NivagSwerdna on May 04, 2018, 09:19:39 amIf only the last button press matters (like the old school radio buttons [or their modern, web skeuomorphism]), you probably don't need to debounce.If buttons are typically pressed one at a time, it's only if the difference between "last button or 'no button'" matters that debouncing comes into play.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 04, 2018, 10:40:42 am
content: I ordered "10pcs MM74C923N Original 16-Key Encoder 20-Key Encoder DIP-20" on the slow boat. That should do me for this gadget.

author: Benta
author_rank: Super Contributor
timestamp: May 04, 2018, 12:46:38 pm
content: You solved it, good. Otherwise, the easiest solution is a priority encoder like CD4532. It's only 8 inputs, but two ICs can be cascaded for 16.
Energizer Lithium AA cell voltage under load - Page 1
Forum section: electronics / projects

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: March 26, 2022, 02:20:24 pm
content: I've just had a curious experience, the short version of which is that I traced the anomaly to an excessive battery voltage.The device in Q required a 1.5V battery supply - and given its age (1970) predates any fancypants cell chemistry.I had however used an AA Energizer Li cell.Now, the Energizer spec would suggest that is OK when basically open circuit - see diagram.However, I always test on load and I got a steady 1.737V with 88mA - this certainly does NOT meet spec. Several cells from two different batches tested the same.Not sure I'm too happy with some multi-cell devices I have (e.g. 4 x AA , 6V 'nominal') getting 6.8V...Anyone come across this and/or thoughts?

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: March 26, 2022, 03:51:20 pm
content: Just found this chart on the Energizer website, which appears to contradict the above 'Discharge Profile' - the above asserting that 10mA discharge will produce a ca. 1.5V output over the bulk of the capacity of the cell, whereas below suggests many service hours above 1.5V.Am a bit puzzled.

author: Stray Electron
author_rank: Super Contributor
timestamp: March 26, 2022, 04:59:58 pm
content: Are you measuring voltage and current simultaneously or are you measuring one and then the other? What is the open circuit voltage of the cell?

author: floobydust
author_rank: Super Contributor
timestamp: March 26, 2022, 05:24:45 pm
content: What you're seeing is normal and within spec. From the Energizer FAQ:What is a normal open circuit voltage for an L91? {AA}"The normal open circuit voltage for anL91is higher than that of alkaline and ranges from 1.75-1.8V. This should not pose a problem in devices since the voltage drops once the battery is under load."Will the higher open circuit voltage damage my device?"No. Numerous devices have been tested and third-party device engineers have certified that the higher open circuit voltage of the L91 is not an issue in devices."If you are using one of these lithium for a reference battery 1.50V then I'd add an LDO like replacements for PX625 1.35V mercury battery.

author: bdunham7
author_rank: Super Contributor
timestamp: March 26, 2022, 05:42:19 pm
content: Quote from: 6SN7WGTB on March 26, 2022, 03:51:20 pmThey're both useless baloney. The V/I characteristics of the Energizer Lithium AA cells are very dependent on cell temperature and any characterization that ignores that is useless. At room temperature or a bit warmer, they will put out quite a bit of current at well over 1.5V.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: March 27, 2022, 09:23:43 am
content: "However, I always test on load and I got a steady 1.737V with 88mA"So it is NOT dropping under load!
Energy from used batteries - Page 1
Forum section: electronics / projects

author: TonP
author_rank: Newbie
timestamp: September 26, 2014, 07:42:51 am
content: Normaly I used my "old"batteries for my clock. The problem is that I have less clocks then batteries.....If I make a low energy consuming device that can harvest the remaining energy from the old batteries and put the energy in a converter and connect it to the grid?Am I crazyor does anyone know a solution to set up a universal input voltage step-up convertor to power the convertor?

author: miguelvp
author_rank: Super Contributor
timestamp: September 26, 2014, 08:29:39 am
content: Has been discussed recently here:https://www.eevblog.com/forum/chat/energy-harvesting-of-used-batteries/I don't recall if anything came out of it.

author: TonP
author_rank: Newbie
timestamp: September 26, 2014, 08:56:38 am
content: Did you see a solution there?

author: ejeffrey
author_rank: Super Contributor
timestamp: September 26, 2014, 09:09:27 pm
content: I doubt you could do this in a way that makes sense. The amount of energy in a nearly dead battery is a few hundred joules. That is enough to power a soldering iron for a few seconds. So you would probably have to recover 1000s of batteries to save just the amount of energy used in soldering your PCB together.Sending power from small batteries to the grid also wastes the value of a battery: that they are portable, safe, and convenient.If you want to harvest energy from a battery, learn about "joule thief" circuits and try to figure out a way to extract the last bit of juice to power some portable devices.

author: Rick Law
author_rank: Super Contributor
timestamp: September 27, 2014, 04:00:54 am
content: During one long storm power outage, I was caught unprepaired with most of my batteries low or without charge. I managed just 30 minutes of light (MiniMag) with about 20 batteries.Since disposables (primary) batteries can hold charge as long as LSD-NiMH, I now put all those near-dead primary batteries in the emergency bin. I have 4xLED (UltraBright white kind) driven by 3AA, purposely under-driven for lower power draw. The 4 LEDs set to draw only about 10mA total. That 20-30 "dead" primary batteries will be call back out to duty should it become necessary - a job I called "Total Darkness Avoidance".
Energy Harvesting and current measurement for CT's - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: August 25, 2018, 11:16:49 am
content: Hi,I have read some articles from TI like the TIDA-01385QuoteI got the basic Idea of harvesting the energy, there remains current measurement, what's the idea behind it? how should I add current measurement into the design as there is no evidence of just doing that.
Energy harvesting - Page 1
Forum section: electronics / projects

author: akis
author_rank: Frequent Contributor
timestamp: October 21, 2015, 05:48:29 pm
content: I was told there was this guy that lived close to a radio station had made a big wire loop on his lawn and was harvesting electricity.I was told there is a system of drilling down installing a vertical or more complex system of water pipes, circulating water and picking up heat from the ground.In my summer house the winds are furious, and the sun burning, and I am sure a solar/wind generator would go a long way.What would be the best method of generating electricity for domestic purposes in a place with low/medium wind, and little sunlight?I suppose that if we electrolyse water, collect the hydrogen, maybe the oxygen too, make some sort of brown's gas, or use the hydrogen to power an electricity generator, would that work as long as you kept providing the water (the resource being the water)?
Energy Management Equipment Standard - Page 1
Forum section: electronics / projects

author: Darren DeBattista
author_rank: Newbie
timestamp: May 03, 2018, 09:52:54 am
content: Hi All,I am currently designing an energy management product in which the UL916 standard is needed in order to be sold in the US. The intention is to also sell the product in Europe. My question is, is there a similar IEC, EN, VDE or BS standard to the UL 916 which should be used for energy management equipment in the EU? I tried to search for the standard but I have found nothing that directly relates to energy management equipment. The only standard I found which may be the one needed is the EN 50491 but is more focused on home automation. If anyone has an idea, it would be greatly appreciated.Thanks
Energy meter and injection set projects i'm working on  - Page 1
Forum section: electronics / projects

author: threephase03
author_rank: Contributor
timestamp: January 26, 2022, 04:09:05 am
content: Hi EveryoneI've been working on building a energy meter for sometime and got sick of having to unpack equipment out of the car (I do field calibrations) to work onit so I put the energy meter on the back burner while I make a 3 phase voltage and current injection set. Now while I wait for components to arrive I can jump between the two.Once I've got two good working prototypes ill make them again from scratch to clean them all up..Also if anyone knows a good contact for mu-metal toroidal transformer cores in Australia id appreciate it.If you would like to check out where I am roughly at the moment id appreciate the feedback, I've been able to develop this far with improvements from people that have checked it out.Link here.https://youtu.be/ek2gjLLopws
Energy monitoring with 40 current clamps - needs your help - Page 1
Forum section: electronics / projects

author: frenky
author_rank: Unknown
timestamp: March 04, 2024, 07:49:25 pm
content: Hi guys.My electrical box in house has approximately 40 electric fuses.Currently I am monitoring only 4 but I would like to monitor all 40.My current system is like this:Four current clamps SCT006 are connected to differential inputs (through some resistors) of ADS1115 (ADC). Two of this ADC are connected to ESP32 trough i2c.ESP32 sends data to my HomeAssistant trough mqtt.I have two ideas how to accomplish monitoring of all fuses but I would really like to hear your input about it before I fully commit.Idea 1:Use 5x ADS1256 (ADC with 8 inputs) connected to arduino micro over spi. Every 10 seconds send all 8 measurements over serial port to RPI Zero W. And from PI Zero direct sql insert to Pi5 with MySql DB.(This PI would have DB on SSD for more reliable storage and will be in another room)Idea 2:Use 5x ADS1256 (ADC with 8 inputs) connected to ESP32 over spi. Every 10 seconds send all 8 measurements with http (post) request to PI 5. Web server on it would then save this data to MySql DB.(This PI would have DB on SSD for more reliable storage and will be in another room)Idea 3:Perhaps there is better more efficient way to achieve the same result? I would love to hear from you guys...
energy requirement for formation of ball lighting like phenomena? - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: December 31, 2018, 02:17:40 pm
content: What is the minimum formation energy required for a ball lighting phenomena?Could it possibly form in a sub station or circuit if there is a fault ?https://en.wikipedia.org/wiki/Ball_lightning#Vaporized_silicon_hypothesisI wonder if a blown transistor can make it possibly to fuck something else up in a circuit? (in a one in a million odds)..

author: helius
author_rank: Super Contributor
timestamp: December 31, 2018, 03:55:30 pm
content: Most current research points to "ball lightning" as a neurological condition triggered by strong electromagnetic fields.

author: coppercone2
author_rank: Super Contributor
timestamp: December 31, 2018, 03:58:09 pm
content: its on high speed videoat least read the wikipedia article.these are interesting too, it looks kinda like high life time welding spatterftp://ftp.aip.org/epaps/phys_rev_lett/E-PRLTAO-98-047705/i think thats a silicone rod or substrate. imagine that flying in side of a enclosure.

author: IconicPCB
author_rank: Super Contributor
timestamp: January 01, 2019, 12:20:01 am
content: We have experienced a ball lightning.A lightning went past our workshop and continued past the house, between the house and rainwater drums.In the workshop we lost a printer and a PC while th actual lightning was eyewitnessed by our mother.A few seconds had elapsed and a loud bang was heard in the village down the road from us followed by a whole bunch of alarms going off.

author: mark03
author_rank: Frequent Contributor
timestamp: January 01, 2019, 01:25:51 am
content: While I like Helius' explanationthe weight of evidence seems to be leaning towards the "it's dirt" theories. Some Chinese researchers seem to have captured a spectrum on film:https://physics.aps.org/articles/v7/5Apparently, so the theory goes, a lightning strike vaporizes some soil constituents which can then form the luminous burning ball. This seems to explain a number of observations, but not all, e.g. the well attested sightings on aircraft.It is not at all clear that the ball-like discharges obtained in laboratories are the same thing as naturally occurring ball lightning, so the OP's question is impossible to answer.

author: coppercone2
author_rank: Super Contributor
timestamp: January 01, 2019, 07:27:21 am
content: Well, despite the fact they may be different both issues look very harmful to circuits.Is there any artificial phenomena with blown transistors like that that can carry some kind of high energy circuit destroying objects around a chassis?
Energy valley Toggenburg - Page 1
Forum section: electronics / projects

author: Manderby
author_rank: Newbie
timestamp: December 14, 2019, 12:20:50 pm
content: Hi there David,came to this forum by watching the famous solar roadway videos. Very amusing stuff. But I am generally interested in technical advancements, therefore I was looking for discussions on this forum about a project which has been going on in Switzerland for about 10 years (I'm far away from there but I remember this was a big deal when this came out). But I did not find anything about it on this forum. So I just wanted to have your (and other members in this forum) 's opinion on it.http://www.energietal-toggenburg.ch/anlagen.htmlIt's in german, but you figer this out.Some background info: In Switzerland, the 2000W society is a goal which should (could, would, is being dreamed of...) be reality by 2050. There are several advancements like better insulation using the Minergy standard which is applied to all new houses, more wooden houses, more renewable energy sources, solar panels, wind turbines, gas (bio, fossil or power-to-gas) instead of petrol, lots of water reservoirs, new heating with woodchips and heatpumps, ... It is arguably the right way but we don't know if we will meet the goal.The valley of Toggenburg set the goal to become energy self sustaining by 2034 by subsidizing lots of technical advancements. Would love to hear your opinion about it.Cheers!

author: Marco
author_rank: Super Contributor
timestamp: December 14, 2019, 02:26:33 pm
content: Quote from: Manderby on December 14, 2019, 12:20:50 pmCorrect me if I'm wrong, but I don't see any major pumped hydro projects in Toggenburg and power to gas with gasfield storage is nowhere near ready for 2034. Without any viable longer term storage how can you be (grid) energy independent in 2034 without pretending that the external grid is faux storage? Will your local government buy (part of) an external pumped hydro station to be able to honestly lay claim to the storage? Of course using that storage for itself, not for the economically optimal use at any given time ... because that would be cheating.Cheating being rampant in these claims of energy independence, you can't just compensate one kWh for another and pretend they are equal ... they are not.PS. you can have your own fossil fuel gas generating plants of course, but without your own gas fields that still not really independent.
[CRIMPERS] Engineer PAD-01 vs PA-09 models - Page 1
Forum section: electronics / projects

author: eliocor
author_rank: Unknown
timestamp: October 04, 2017, 08:48:11 pm
content: I'm the lucky owner of an EngineerPA-09crimper and I was thinking to buy also thePA-21unit, but I discovered that they produce also thePAD-01bundle (at the end of page):PAD-01 can be find at a reasonable price at HobbyKing: about89€- Have someone of you used the (PAD-11 + PAD-12 + PAD-13) = PAD-01 crimper? If yes, what are you opinions?- How does PAD-01 compare against PA-09/PA-21 combination?Any suggestions/comparisons/comments are welcome!. TIA_ Elio.[added later] In general I use a single family of connectors for every project (maybe with different pin counts) so I will not need to change dies every so often.PA-21:PA-09:PAD-01:PAD-11:

author: Tomorokoshi
author_rank: Super Contributor
timestamp: October 04, 2017, 11:50:45 pm
content: I bought the PA-09, PA-20, and PA-21 tools after having the same problem.I decided on three tools to avoid having to change the jaws out. It also makes for a lighter, more compact tool. Additionally, in case I ever get in a situation where I need to work sizes across two different jaw sets at the same time, I would be better off with the separate tools.I like them overall. It would be nice if the crimping surface was deeper to better work with larger pins. As it is I just need to crimp 3 times: twice for the wire, and once for the insulation. Note that it splits the wire crimp. Otherwise it seems to hold just fine.

author: nanofrog
author_rank: Super Contributor
timestamp: October 05, 2017, 12:53:30 am
content: I've not had access to any of the PAD models, but based on specs, it will be able to do more connectors than the combination of a PA-09 & PA-21 due to the third die. And as it's longer, will do the small and medium sized connectors with less strain/fatigue.It's also a better bargain given the number of terminals it can do, and the fact it has a case is a nice addition as well IMHO.

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: October 06, 2017, 02:43:38 pm
content: For small crimps I found the smaller head and frame of the PA more comfortable to use than the PAD frame, but you have that covered already.The PAD kit is a good investement if you want to cover a decent range. It goes beyond the PA 9/20/21 on the large end, and has more leverage. Watch your fingers on the wire cutter. For doing a lot of crimps, finding a full width ratcheting tool is a better, but a more expensive, way to go.Take into consideration that cross the tools, there is often a design difference in crimp height and thickness for the same noted crimp width, affecting wire capacity and crimped length. Check the charts athttp://www.engineer.jp/en/products/pa09e.html. For the smaller die sizes, this may alter what tool you decide on.
English reference for IV-6 Vacuum Fluorescent Display Tubes? - Page 1
Forum section: electronics / projects

author: Metatronic_Mods
author_rank: Contributor
timestamp: December 19, 2016, 07:44:23 pm
content: Hey all, I recently purchased a bunch of IV-6 vacuum fluorescent display tubes. No idea what I'll do with them yet, but they're too pretty and the price was too good to pass on.I would like to test a selection of the lot, just to make sure the deal wasn'ttoogood, before I sequester them to one of my drawers of oddities to be completely forgotten till a slow work week 8+ months from now.So far all I've been able to find are Ukrainian data sheets for the IV-6, and some general info about VFD's in English. I had thought the pin out on the Ukrainian data sheet would be enough info, but I'm not sure if the diagrams are bottom up or top down, and the glass around the leads obscures too much to cross reference the actual tubes.Barring the existence of an English data sheet, can someone who knows VFD's tell me, would I be safe enough to probe the leads with 12-15v to tease out the details? Or would a reversed power connection likely cause damage to the display segments?Thanks!

author: Metatronic_Mods
author_rank: Contributor
timestamp: December 19, 2016, 08:00:46 pm
content: I did find EEVBlog #717 - How to hack VFD's in my search. And I am reading through that now, although it seems to be more about how to repurpose VFD displays that include their own driver board, rather than the simpler matter of just getting the right voltages to the display segments and grid of the tubes.

author: Ian.M
author_rank: Super Contributor
timestamp: December 19, 2016, 08:23:13 pm
content: Identify the filament pins with a DMM on ohms. Applying excessive voltage across the filament would be *BAD*. Once you have the filament correctly powered, applying up to 24V DC with respect to the filament to other electrodes is pretty safe, though you wont see anything unless you manage to get the grid and at least one anode positive with respect to the filament.There's enough info to get going with them here:https://www.eevblog.com/forum/chat/operating-numtiron-tubes/

author: edavid
author_rank: Super Contributor
timestamp: December 19, 2016, 09:04:06 pm
content: You can identify the pinout and test the tubes using the photos here:https://mintelectronics.wordpress.com/2012/08/05/iv-6-vintage-sovietnumitron-tubes/(And congrats to the OP for correctly describing these as VFDs, instead of incorrectly calling them Numitrons as many others do.)
Engraving in color? - Page 1
Forum section: electronics / projects

author: SenSeS
author_rank: Contributor
timestamp: February 25, 2016, 01:30:55 pm
content: I recently got into laser cutting and was wondering how they achieved the red and black logo on my Makerbot Thing-O-Matic (see picture). Was it engraved and how do they achieve that color?

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 25, 2016, 01:33:52 pm
content: It is screen printed.

author: SenSeS
author_rank: Contributor
timestamp: February 25, 2016, 08:44:08 pm
content: Thanks!

author: dom0
author_rank: Super Contributor
timestamp: February 25, 2016, 09:26:30 pm
content: You can engrave in color. First engrave, then fill with paint. Doesn't really work on wood.
Enhanced Nextion 2.4" seems to be hackable, intent or oversight? - Page 1
Forum section: electronics / projects

author: hlavac
author_rank: Frequent Contributor
timestamp: October 04, 2016, 08:13:05 pm
content: I was playing with the nice little2.4" Nextionand wondering if I could put my own firmware on it.I got me a ST Link/V2 programmer and started poking around...Here is the pinout I found for the SWD debug port J3:To my surprise, I can! I admit I expected the code protection to be enabled and debug port disabled...I have to wonder - are Itead such a good guys? Or did they simply forget to set the protectionAnyway this probably opens a way to alternative firmware for 2.4" enhanced Nextions that could do the whole job (ditch the arduino!)... anyone interested?

author: hlavac
author_rank: Frequent Contributor
timestamp: October 04, 2016, 08:55:43 pm
content: That is not the same. If you hack a scope to enable features, you use something of theirs you have not paid for.I want to use the hardware without the firmware. I'm not using stuff I have paid forIf it was a scope I would be erasing the firmware on it and writing my own. You would try to stop me from doing that to a hardware I own?Nextion has lot of stuff, saves me designing a board with a decent microcontroller (STM32 is really nice, ARM), and LCD, all the power stuff for LCD etc...I wonder if it would runarduino for STM32?

author: viperidae
author_rank: Frequent Contributor
timestamp: October 05, 2016, 06:33:14 am
content: In my experience itead are good like that. They post schematics for all of their esp based smart home devices and all of them have 2.5mm headers for the esp serial port

author: ebclr
author_rank: Super Contributor
timestamp: October 05, 2016, 06:44:51 am
content: Will be cheaper and easier using a board like this, all the value of Nextion is on the ready firmwarehttp://www.mouser.com/ProductDetail/STMicroelectronics/STM32F469I-DISCO/?qs=sGAEpiMZZMufdu5QM0tCwQQ5%252b7z4ScXvnazCWkqibGI%3d

author: hlavac
author_rank: Frequent Contributor
timestamp: October 05, 2016, 10:15:04 pm
content: Are you sure? This discovery board is like 2.5x the price of the Nextion...

author: ebclr
author_rank: Super Contributor
timestamp: October 06, 2016, 04:59:10 am
content: Check the display size, and note capacities touch, if you issue is pricehttps://world.taobao.com/item/524686134827.htm?spm=a312a.7700714.0.0.viE1ol#detail

author: epy
author_rank: Regular Contributor
timestamp: January 24, 2018, 06:28:59 pm
content: Hi,yes i used this display recently only. I really liked this display now. All logic of display handling is done by display board, you have to just send data to board via UART and you are free to work other jobs.

author: cdev
author_rank: Super Contributor
timestamp: January 24, 2018, 10:16:54 pm
content: Using free tools to build your GUI using widely available commodity displays seems likely to save lots of money.
ENIG vs HAL  - Page 1
Forum section: electronics / projects

author: gaminn
author_rank: Frequent Contributor
timestamp: February 11, 2020, 11:42:28 am
content: Hi,I have exposed pads on a PCB that will serve as button. These pads will be touched by a piece of conductive rubber to make a contact.What surface finish should I select? The environment will be indoor (e.g. standard living room).Thanks

author: wraper
author_rank: Unknown
timestamp: February 11, 2020, 11:48:48 am
content: The best would be carbon coating. Is it for frequent or occasional button presses? The issue with ENIG is that it's a very thin soft gold layer which is not mechanically durable. HASL is simply uneven, especially in lead free variant.

author: gaminn
author_rank: Frequent Contributor
timestamp: February 11, 2020, 11:53:52 am
content: Uneven surface is not a problem at all. The conductive rubber is soft and the pad on the pcb has "advanced" shape. I think even with very uneven surface the contact with the rubber will be good.My concern is mainly about long term stability of the surface. How quickly will lead free HAL oxidize (in normal room)?

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: February 11, 2020, 11:54:39 am
content: Yes, carbon coating is best suited for this. Please open up any remote controller. The high chances are that the pads are carbon coated.

author: gaminn
author_rank: Frequent Contributor
timestamp: February 11, 2020, 12:05:04 pm
content: I suppose carbon ink is printed on the pcb using screen printing. What surface can it be printed on? If it needs pure copper then the production of the pcb will be a little complicated as there are other components on the PCB (so HAL or ENIG is needed).

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: February 11, 2020, 12:16:26 pm
content: Please check with the FAB house. Not all of them can do this and everyone would have a separate requirement.

author: wraper
author_rank: Unknown
timestamp: February 11, 2020, 01:44:13 pm
content: Quote from: blueskull on February 11, 2020, 12:30:18 pmCarbon is thick so even if it does wear somewhat, does not really matter. Also I've never seen worn off carbon switch pads.
ENIGMA C4 CABLE or A4 adapter - Page 1
Forum section: electronics / projects

author: Franco
author_rank: Newbie
timestamp: December 11, 2020, 10:49:30 am
content: Hello everyone, I am looking for helps to build a Cable for ENIGMA programmer, I need the model "C4 cable", just to know the wiring diagram from DB-9 to DIP-8, then I can do it myself.If somebody have the Enigma programmer to wiring up the "cable C4 or A4 adapter", could show the wiring diagram from DB-9 to EEPROM PINs 24C16 ??Thank you all.
ENOCEAN - Page 1
Forum section: electronics / projects

author: eurofox
author_rank: Unknown
timestamp: February 27, 2014, 12:28:13 pm
content: http://www.enocean.com/en/home/Hi,Anybody experience with development with this technology?eurofox

author: Frost
author_rank: Regular Contributor
timestamp: February 27, 2014, 02:53:24 pm
content: Quote from: eurofox on February 27, 2014, 12:28:13 pmNo, but I think we will see a lot of stuff at the light + building.

author: babysitter
author_rank: Frequent Contributor
timestamp: February 27, 2014, 08:50:52 pm
content: Inherited some project with a energy harvesting powered thermometer using enocean stuff. Was the first thing I removed, as the receiver was eating 80% of the power consumption of the battery-powered logging device it was connected to.
Ensure USB device recognizes host disconnection - Page 1
Forum section: electronics / projects

author: HasanSyr
author_rank: Contributor
timestamp: March 24, 2025, 10:40:22 am
content: Im using an analog switch to switch between using 1 USB port for programming/debugging (that goes to the FTDI chip) and for a normal USB connection that goes to USB HUB -> PHY -> FPGA. The USB Hub is USB2514, the rest of the 3 ports are already used.This circuit sends a pulse to the OE pin on the diff pair demux whenever the physical select switch is moved so that one of the USB devices fully recognizes that the host disconnected. Im wondering how long the pulse needs to be for the analog switch IC to recognize it. I'm also wondering; will the 2nd gate input, being transient, create a problem where the logic gate might not recognize it as a DC signal? I chose the gate to have Schmitt inputs, does that cover it?Shouldn't the analog switch be responsible for ensuring complete disconnection, isn't that the whole point?

author: moffy
author_rank: Super Contributor
timestamp: March 24, 2025, 11:05:47 am
content: If S1 is a mechanical switch then it will experience bounce, you might watch some deglitching on the switch before the /OE and S logic. The /OE just disconnects all of the USB devices during a switch transition, the mux's job is to connect one or the other bus, or disconnect all the buses it has very little logic internally. The use of schmitt inputs should solve any problems caused by the slow transition speed of the RC input.

author: HasanSyr
author_rank: Contributor
timestamp: March 24, 2025, 11:58:01 am
content: Quote from: moffy on March 24, 2025, 11:05:47 amI know that the switch needs to be debounced and I understand that the OE signal enabled/disables both lines. My concern is that since the OE should always be enabled there might be a case where one of the unused devices thinks it is connected to the host when it's actually just connected to the analog IC switch.

author: moffy
author_rank: Super Contributor
timestamp: March 24, 2025, 12:10:59 pm
content: I don't know much about the USB protocol, but there is probably a safe disconnect protocol, like when one disables a USB device connected to a PC for safe disconnect. There must also be the ability to recognise a hot disconnection because it is hot swappable, but that might come through the VBUS recognition for devices.
Entrelec terminal footprints are upside down when inserted at 90 degrees - Page 1
Forum section: electronics / projects

author: danjenkins
author_rank: Contributor
timestamp: March 13, 2017, 03:02:49 pm
content: Just FYI for anyone using Entrelec terminal blocks. The footprints that are included with AutoCAD Electrical are rotated 180 degress in the wrong direction. When you insert at a 90 degree angle for a horizontal DIN rail, you will notice that the screwdriver slot for removing the terminal is on the top. Try inserting an M4-6 and you will see what I mean.http://www.clrwtr.com/PDF/ABB-Controls/ABB-Screw-Clamp-Terminals.pdfEven the End Stop is upside down. I edited the Entrelec blocks I use and rotated them so they look correct now. But there are many more to do.
Envelope following square wave 'effect' pedal - Page 1
Forum section: electronics / projects

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: September 04, 2016, 11:45:15 pm
content: Hi all!Soo, I've been playing around with the idea to make a square wave effect pedal for fun (already have square/synth in my multieffect aka axe fx).So here's the schematic and LTSpice test:I think next up is to build it on a breadboard!Any input welcome of course, I still feel very new with analog electronics.
Epiphone EA28-RVT Tube amplifier repair - Page 1
Forum section: electronics / projects

author: jcrubin
author_rank: Frequent Contributor
timestamp: January 30, 2017, 01:31:09 pm
content: This thread documents the repair of the Epiphone EA-28 RVT, This one was heavily modified

author: KhronX
author_rank: Frequent Contributor
timestamp: January 30, 2017, 02:26:33 pm
content: Surely that's gotta cost an arm and a leg - it's "hand-wired" after all, isn't it?
EPROM Emulator in 2022 - Page 1
Forum section: electronics / projects

author: ajeje
author_rank: Newbie
timestamp: January 25, 2022, 07:29:22 am
content: I'm considering to design my own emulator to emulate old 27XXX eprom on car's ecus.I've seen this :https://www.eevblog.com/forum/projects/27c256-eprom-emulator-project/and some project on github likehttps://github.com/DL2DW/EPROM-Emulator-NG-IIAll of them miss a feature that I really need : "trace".Considering that all of this project are dated before 2018(4 or more years ago),what would be the better approach now in 2022?

author: BradC
author_rank: Super Contributor
timestamp: January 25, 2022, 07:34:50 am
content: Ye Olde Moates Ostrich :https://www.hamotorsports.com/products/ostrichTool of tuners worldwide and offering a beaut trace function. You can pry mine from my cold dead hands.

author: ajeje
author_rank: Newbie
timestamp: January 26, 2022, 03:43:52 pm
content: I known this product, but I would like to build one because in my country is very difficult to find..Any advice?I saw different approach in old posts but anyone mention trace feature.
EPROM Emulator - Page 1
Forum section: electronics / projects

author: MicroCoreLabs
author_rank: Newbie
timestamp: March 25, 2021, 08:41:13 pm
content: Hi,Just finished a small EPROM emulator which uses a Teensy 4.0 (Arduino-like board) and a small PCB which you may enjoy.https://microcorelabs.wordpress.com/2021/03/20/eprom-emulator/Thanks,-Ted Fried
EPS Motor Controller - Page 1
Forum section: electronics / projects

author: Obi_Kwiet
author_rank: Regular Contributor
timestamp: October 05, 2015, 10:56:18 pm
content: Now that electric power steering in cars has become popular, it's now possible to get a BLDC power steering motor for ~100$ off of ebay, or even less if you are handy and have a junkyard nearby. These things must be far cheaper than the equivalent off the shelf motor. Does anyone know of someone who has played around with these things?

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 06, 2015, 05:19:16 am
content: They're more or less BLDC servo motors. As such, they would be good for DIY robotic applications, but I haven't been able to find much on repurposing them. Most likely because they're too complex for the average hobbyist.
Epson AO6860LAN 10 MHz atomic oscillator - Page 1
Forum section: electronics / projects

author: FrankenPC
author_rank: Unknown
timestamp: November 22, 2015, 06:05:00 am
content: Very vague details from what I can see. A smallish device that can deliver 10 MHz with a claimed +- 0.05ppb long term stability. Dimensions: 68 x 60 x 18 mm.http://global.epson.com/newsroom/2015/news_20151104.htmlhttp://global.epson.com/newsroom/2015/pdf/151104.pdfThere are other players in this space:http://www.microsemi.com/products/timing-synchronization-systems/embedded-timing-solutions/components/sa-45s-chip-scale-atomic-clockDoes this mean Epson will be competing with a very low price point?

author: German_EE
author_rank: Super Contributor
timestamp: November 22, 2015, 08:54:15 am
content: Very interesting, especially as rubidium frequency references are beginning to disappear from EBay. I wonder what the price of these in one-off quantities is?
EPSON R390 LCD Display - Page 1
Forum section: electronics / projects

author: Insoft
author_rank: Newbie
timestamp: June 26, 2013, 06:26:06 pm
content: I have had this LCD panel taken out of an EPSON R390 printer for some time and like to use it but I can't get any info that tells me how to make use of it.I have the pinout as followedPIN Description1 - GND2 - SCLK3 - GND4 - SCE5 - SDATA06 - SDATA17 - SDATA28 - GND9 - PNLRST (active low)10 - +3.3V11 - +3.3VDo anyone know or have played around with a LCD with pin outs like this before.

author: minibutmany
author_rank: Regular Contributor
timestamp: June 26, 2013, 07:28:58 pm
content: Is there a chip on the board with any part numbers? Or is it just one of those chip on board things? If you look up the part numbers of any ICs on the thing, you should be able to get a pretty good idea of what you need to feed it. You could also look on the main board for the printer for any sort of LCD driver.

author: Insoft
author_rank: Newbie
timestamp: June 26, 2013, 10:03:49 pm
content: They is no ICs at all on the PCB that the LCD is connected to, any components that are on the board are simply resisters, caps, inductors etc mainly for the 3+V line for the backlight.I do know it is 240 x 320 and I am sure it is 16-bit (262,000) colours.I did find a service manual for the printer.I just not sure how to start to figure this LCD out, I have a Arduino MEGA 2560 R3 board so if anyone got any ideas how I could start to figure it out would be a big help.

author: amyk
author_rank: Super Contributor
timestamp: June 27, 2013, 11:26:08 am
content: Quote from: mojo-chan on June 27, 2013, 11:07:16 amIt might be a controllerless raster-scan panel; SDATA0-2 could be serial RGB data inputs. The chances of an intelligent controller and/or built-in memory (like the little Nokia displays) tends to decrease with increasing resolution.Quote from: mojo-chan on June 27, 2013, 11:07:16 am"Observing in the natural environment" is definitely a good idea for this. Even if the printer doesn't work as long as it tries to show something on the display when powered up this should be enough. Watching Mike's YouTube video is also another good idea.

author: Insoft
author_rank: Newbie
timestamp: June 28, 2013, 10:16:47 pm
content: I am going to have a little play about with this LCD with an Arduino to see if I can get something working else it is buying a GLCD.I will post my result here.
Epson Wasteink Maintanance Cassette Chip C12C934461 - Page 1
Forum section: electronics / projects

author: kocy
author_rank: Newbie
timestamp: July 17, 2024, 07:51:19 am
content: Hello,I specifically bought an Epson Printer (ET-2830) with a Waste ink cassette (Maintanance Box) so I can replace the waste ink packs quite convenient. (Without needing to resort to sketchy programs resetting the waste ink counter)I even bought some chinese replacement chips, so I can just replace the sponges inside the Cassette (C12C934461) instead of buying the replacements.Now I have a set of 10 chips that should last me the lifetime of the printer.But I had this idea to just set the Chip to Write Protected and it just never counts upwards, then I just dispose off the waste ink with a hose into an transparent tank outside the printer.I have attached an image of the chips I bought.I cant seem to find any datasheet based on the markings on the chips. (They are all different)Is there a possiblity that I can just ground one of these pins and it never counts up? (To set it to write protected)Or is that a naive assumption?Is that chip an eeprom?Could reading out the eeprom and the reseting it everytime automatically with an esp or such be also an option?Ive read about a person that reverse engineered a canon waste ink chip, and was able to reset them.Thanks in advance for anyone whos looking into this.edit: added backside of pcb

author: coromonadalix
author_rank: Super Contributor
timestamp: July 17, 2024, 10:50:15 am
content: if the chips have auto reset ....
Equilavent component of HV513WG-G - Page 1
Forum section: electronics / projects

author: tlhsglm
author_rank: Contributor
timestamp: September 21, 2022, 09:08:00 am
content: Hi dear readers,I have to find HV513WG-G (8-Channel Serial to Parallel Converter with High Voltage Push-Pull Outputs, POL, Hi-Z, and Short Circuit Detect) . But sellers gives estimated stock date 2023 february. Can you help me on how to get along this situation by replacing it with equalavent?Datasheet is here :https://pdf1.alldatasheet.com/datasheet-pdf/view/843579/SUTEX/HV513WG-G.html

author: Terry Bites
author_rank: Super Contributor
timestamp: October 09, 2022, 12:15:24 pm
content: Microchip took over supertex.HV5812MAX6934
Equipment grounding - Page 1
Forum section: electronics / projects

author: glicos
author_rank: Regular Contributor
timestamp: June 13, 2016, 03:38:14 am
content: Good day to everyone. Have some question regarding detecting equipment grounding.Is it possible to detect the grounding connection between two equipment (let say a handler and tester) and will set an alarm if the connection between the two is greater than 1 ohms? Can i use an ordinary milliohmeter to check the resistance?The equipment to be monitored are powered and monitoring is done online and in production setting. As far as i know, powered equipment have some "stray voltages" between two points on their grounding connection.Monitoring is done due to EOS (Electrical Overstress) problem on wafer testing.Thanks for any inputs...

author: Rerouter
author_rank: Super Contributor
timestamp: June 13, 2016, 05:22:16 am
content: You would probably be better off quickly sketching what you mean,If its to ensure a good ground connection across a loom, include a wire that gets linked at the remote device to its ground, then you can measure the voltage drop,If its for an existing device, probably not, all i can imagine is a DUT end voltage monitor, if either the ground or the supply connection goes bad the voltage will reduce to a point you can flag on,

author: sarepairman2
author_rank: Frequent Contributor
timestamp: June 13, 2016, 05:58:18 am
content: The problem with using a normal miliohm meter for a safety ground is a question of current handling. You could have a 40 gauge wire read a llow resistance but it will explode if you try to put 20 amps through it.A proper ground tester uses many amps. You want your ground the handle the surge the outlet produces without going open circuit. You want your ground to stay intact long enough to activate the circuit breaker (incase the GFIC that may or may not be there fails).A low current ground circuit may give a false sense of security for safety purposes. However it can be useful as a detector (i.e. that someone did not wire it correctly) or that the ground is intact for small signal purposes. The limitations of such a circuit must be known.A proper source for ground testing weighs several pounds. It may be called a "ground bond tester" or something. You would not implement this circuit in something you build unless you don't mind a big price tag. Not to mention saftey stuff should be checked with tested equipment. I would not rely on something built into a unit for this purpose, you want tractability on this device.

author: glicos
author_rank: Regular Contributor
timestamp: June 13, 2016, 06:49:52 am
content: Quote from: Rerouter on June 13, 2016, 05:22:16 amSomething like the attached picture
Equivalent Circuits Resistor Power - Page 1
Forum section: electronics / projects

author: petersanch
author_rank: Regular Contributor
timestamp: January 06, 2019, 03:33:02 am
content: Basic EE question. I have a circuit with 4 batteries in series and I need series resistance of 12 ohm to limit current to 0.5 A.The current in the top and bottom circuits is the same but the power ratings of the resistors should be different?P=6^2/12 =3watt for the bottom resistorP=1.5^2/3 =3/4watt for the top resistorsIs there any reason to use one circuit over the other?Cheers

author: IanB
author_rank: Super Contributor
timestamp: January 06, 2019, 03:53:07 am
content: Quote from: petersanch on January 06, 2019, 03:33:02 amYour top circuit is more robust. But there is no reason to distribute the resistors like that. You could group them all together in the same position as R5 in the bottom circuit. After all, putting four 3 ohm resistors in series makes a 12 ohm resistor. The circuit is more robust because the 3 ohm resistors are less stressed, and the heat dissipation is spread out over a larger surface. If one 3 ohm resistor fails you still have the other resistors there for protection.
Equivalent Oops command in Eagle? - Page 1
Forum section: electronics / projects

author: rithi3
author_rank: Newbie
timestamp: December 17, 2012, 12:13:42 pm
content: Hi anyone know which option in Eagle layout does the same as what the "oops" command does in Allegro? Thanks!!!

author: IanJ
author_rank: Unknown
timestamp: December 17, 2012, 02:18:12 pm
content: Hi,Noticed you've posted a few times regarding EAGLE. You might get on betterhttps://www.eevblog.com/forum/eda/:-Ian.