hybridfree/eevblog-posts huggingface dataset:
IEE1394 digital video decoding  - Page 1
Forum section: electronics / projects

author: satanistik
author_rank: Contributor
timestamp: January 26, 2022, 08:34:23 am
content: Hello,I have old Sony camera with DV firewire output. I think tu use ISB41AB1 IEEE1394 interface Ic having 8bit data bus. I have Spartan 7 FPGA board width 256MB RAM and HDMI output. The problem is where I can found any protocol description - how to extract Video and Audio data from bit stream.

author: tooki
author_rank: Super Contributor
timestamp: January 26, 2022, 02:54:05 pm
content: The relevant standard is “AV/C Digital Interface”. Seestandards document, attached below.But normally one doesn’t do that — the IC you want to use (whose model you should kindly spell correctly: it’sTSP41AB1) is just the physical link. You also need a controller for the layer link, e.g. TSB42AB4. But it’s one of those devices they will not sell to individuals. :/What is the actual task you want to accomplish with your device? It’s almost guaranteed that an existing solution will be better.
IEE488-Compliant GPIB HP SD Drive - Page 1
Forum section: electronics / projects

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 18, 2024, 03:18:12 am
content: I'm working on updating the design over athttp://www.dalton.ax/hpdisk/to be GPIB compliant. Luckily, his original design uses a very similar MCU to a through hole PIC18F series part I had on hand.Currently, that version connects the microcontroller pins directly to the GPIB bus, which causes problems with having more than one device on the bus. I'm working on adding proper GPIB transceivers to it, and making as many parts through hole as possible, to allow for easy debugging. Currently, the only parts I have not been able to find a through hole alternative for were the USB/UART chip, SD card slot, and SD card logic level converter.I just finished up my first draft of the schematic, and need to double check footprints and connections before setting up the layout.If anyone has any feedback or suggestions, particularly for how the DIP switches and transceiver IC's are connected, please let me know!

author: DavidKo
author_rank: Frequent Contributor
timestamp: April 18, 2024, 05:55:53 am
content: I'm not sure, if the author is member of EEVblog, but he is under nickAndersinVintage HP computer systemsquite active and gave some hints there regarding the HPDisk.

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 20, 2024, 05:58:10 am
content: Thanks for pointing that out! I'll have to see if he is still active over there since it doesn't seem like that project has been active since 2020 or so on his website.
IEEE 488 Male Connector - Page 1
Forum section: electronics / projects

author: PixieDust
author_rank: Frequent Contributor
timestamp: June 15, 2020, 09:35:26 am
content: Does anyone know where I can get a male IEEE 488 connector?https://www.milestek.com/p-19960-female-ieee-488-connector-solder-lug-terminals.aspxAll I can find are female ones and official ones that come with cables and cost an arm and a leg.Looking for one just like the one in the link with normal studs sticking out the exact same way. No plans to mount it to a PCB, want to do a botch job connecting to an UNO.Found one finally:https://www.digikey.com.au/products/en/connectors-interconnects/d-shaped-connectors-centronics/438?k=norcomp+24+position&k=&pkeyword=norcomp+24+position&sv=0&pv88=151929&sf=0&FV=-8%7C438&quantity=&ColumnSort=0&page=1&pageSize=25I knew that as soon as I posted this I would find it.
IEEE 802.3: 10GBASE-ER Receiver Eye Mask? - Page 1
Forum section: electronics / projects

author: bhj99
author_rank: Contributor
timestamp: May 02, 2023, 10:34:07 pm
content: Hi all, does anyone know where I can find the receiver eye mask characteristics within IEEE 802.3 for a 10GBASE-ER interface? I see transmitter eye mask definition, but not much else. I want to perform a 10G signal integrity analysis from the output of a retimer chip to an SFP+ transceiver that supports 10GBASE-ER. Any info is appreciated!
IEPE supply - LT3494 replaceable by TLV61046A (low noise important) ? - Page 1
Forum section: electronics / projects

author: shianne
author_rank: Contributor
timestamp: December 05, 2022, 11:22:21 am
content: edit 2022-12-05 15:53: typo LT3439 to LT3494Hello,I am designing a low noise IEPE-enabled preamp for up to 100kHz with an gain up to 40dB.I found an idea for a low noise IEPE source here:https://www.analog.com/en/design-center/reference-designs/circuits-from-the-lab/cn0540.htmlThey use a LT3494 to step up to 28V, a LT3008 to stabilize/filter and a LT3092 current source to control the current for IEPE.For my op amp I need a symmetrical voltage, about +/-12V is OK, the current will usually be lower than 0.05A (I will feed max. 10Vpp into 1k, usually lower Vpp).From another project I know that a TLV61046A with a charge pump will do the job.While I'm thinking about it, couldn't one TLV61046A be used?The LT3494 is specified as low-noise, the TLV is not.Unfortunately, I have none of the units here to measure.Are there any empirical values?Are there better ideas?(LT3008 is wrong in schematic, I've already seen it)Not true anymore, I got confused by myselfBest wishes,shianne
IFR 1200S service monitor/spectrum analyzer issue - Page 1
Forum section: electronics / projects

author: Radio Tech
author_rank: Frequent Contributor
timestamp: March 13, 2013, 03:06:01 pm
content: I been searching the web looking for answers but are very limited, so was wondering if anyone has ever worked on one of these units. I have had this piece of equipment for many years now. I know there is a place called KG Electronics that work on these. But since he is in the business he does not give out information. So with that here is what is happening.A year ago when I power the unit, the lock light would just flash. Turn the unit off and back on and then the light locks. Sometimes I turn it on and it just flash but will go to lock by itself after a short while.A few months ago I noticed that sometimes when switched to spectrum mode, the trace on the CRT disappears, or the noise floor is way below the bottom of the window. I can switch back to scope mode and the trace is fine. Sometimes I can play with buttons at random and it will just pop back to normal.Yesterday I walk in the shop and power it up; I got a checksum error followed by memory reset. I hit the RF key and all goes back normal. I confirmed this is happening each time it is powered up now.From what I can see the generator is working properly and I see no other faults other than what I described. The only thing close on the web I could fine was a shot blog on a checksum error and a faulty spectrum display.I have not torn into it yet but from what I am seeing I am thinking power supply issues. This piece does have some age on it now and we now caps dry out.Do you think this would be a logical analysis?

author: KJDS
author_rank: Super Contributor
timestamp: March 13, 2013, 07:35:52 pm
content: There's a service manual herehttp://www.repeater-builder.com/test-equipment/aeroflex/ifr1200/ifr-fm-am-1200a-ifr1200s-service-manual.pdf

author: Radio Tech
author_rank: Frequent Contributor
timestamp: March 13, 2013, 08:43:46 pm
content: Thanks, I do have the 3 ring binder manuals here. But hey, an electronic copy sure saves space.I am gong to take this puppy apart friday and see if I can spot something that stands out. Look for hot spots so to say.
IGBT Inverter (PCB board) - Page 1
Forum section: electronics / projects

author: CM800
author_rank: Frequent Contributor
timestamp: September 10, 2015, 03:42:16 pm
content: Hi EEV,I am working on a 330V IGBT Inverter, the DC main average current will be approx 50A max.Is it even feasible to do this on a PCB or should I just move the power stage onto bus bars at this point?I was really rather hoping and planning to keep it onto a stack of PCBs (to look neat)Planning on using components like a current sensor e.g. this one:http://uk.farnell.com/lem/cksr-50-np/current-transducer-50a-5v/dp/2146827and these FETs:http://uk.farnell.com/infineon/ipw65r041cfd/mosfet-n-ch-700v-68-5a-to-247/dp/2443408Going to be running it in a full bridge with PWM control at 20kHz.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 10, 2015, 09:46:01 pm
content: But those aren't IGBTs...That power level is perfectly reasonable to build on PCB. Pay attention to parasitics, as trace length will be in the 20-200nH equivalent range, depending on how good your layout is. (Hint: an optimal amount, rather than a minimal amount, is desirable, especially with a snubber in place.)How many transistors are you intending on using, and in what configuration? What is the source? What is the load? Do you need isolation, gate drivers, EMI filtering or shielding, ... ?Tim

author: mzzj
author_rank: Super Contributor
timestamp: September 11, 2015, 08:00:33 am
content: Quote from: T3sl4co1l on September 10, 2015, 09:46:01 pmhttp://www.epectec.com/articles/heavy-copper-pcb-design.htmlThat 200oz copper should do fine even with bit higher currents

author: CM800
author_rank: Frequent Contributor
timestamp: September 11, 2015, 03:50:48 pm
content: Quote from: T3sl4co1l on September 10, 2015, 09:46:01 pmAh, you got me there. Either way it could be FETs or IGBTs. Not sure which is better always.Having thought further, I think I might use some IGBT bricks and make a hybrid using a PCB to hold it together and have all the standard electronics + gate drivers / isolation. BUS Bars will then go over the top on the main power stage and through mounted Current transformers. I realized it will be much cheaper and more reliable, especially as this is only 1-2off.The Load is a large 20kHz X-ray/ High Voltage Transformer. Source will be standard rectified mains, am considering making a PFC addon however that would be a lot in extra work considering it will be around 16kW max. All controls will be passed through a 2 way fiber cable with Error checking. EMI Isn't much of an issue as this is a non-commercial project.

author: SeanB
author_rank: Super Contributor
timestamp: September 11, 2015, 04:44:42 pm
content: Check with Electrodacus as he is using a similar high power driver but is using a metal core PCB for the power devices. As well PFC is easy if you want to use a simpler method and use a LC tank tuned to 150Hz to improve power factor, and increase conduction angle in the bridge rectifier diodes. At 16kW the L will be large, and C big but within the range of common motor run capacitors. Not going to make power factor 1 but will definitely get it to over 0.8 with little effort.
IGBT Inverter Control Board - Page 1
Forum section: electronics / projects

author: magudaman
author_rank: Contributor
timestamp: September 03, 2023, 05:33:25 pm
content: I am trying to put together 12KW 250Vac inverter that is fed from 400v dc. I recently purchased a couple IGBT modules and control module:https://www.aliexpress.us/item/3256803103544032.html?srcSns=sns_Copy&spreadType=socialShare&bizType=ProductDetail&social_params=20808511886&aff_fcid=94873f74451749bfa96e758114028c35-1693760638753-03383-_mLEFwAe&tt=MG&aff_fsk=_mLEFwAe&aff_platform=default&sk=_mLEFwAe&aff_trace_key=94873f74451749bfa96e758114028c35-1693760638753-03383-_mLEFwAe&shareId=20808511886&businessType=ProductDetail&platform=AE&terminal_id=3e534d71bcee40818cfbfde975785f0b&afSmartRedirect=y&gatewayAdapt=glo2usaI got the setup all wired according to the drawing:I powered the unit up with no high side voltage hoping to verify signals on IGBTs but the unit fault light comes on after 10 or so seconds. SO I took a chance and fired it up with just over 350vdc on the high side but then the unit goes into immediate fault.Has any tried working with these boards yet? Any suggestion of trouble shooting?

author: magudaman
author_rank: Contributor
timestamp: September 03, 2023, 05:49:08 pm
content: There seems to be a serious shortage of good information on these control boards so currently I am stuck. One of the aliexpress sellers sent me a link to a Chinese electronics form (https://www.dianyuan.com/bbs/2487598.html?spm=a2g0s.imconversation.0.0.4fcd3e5fwWc0sj) where it appears the creator of the board may reside but I have yet to make an account there. I included a PDF of the translated thread.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 03, 2023, 06:04:46 pm
content: Yes, another recent thread hit similar problems:https://www.eevblog.com/forum/projects/igbt-buckboostmppt-driver-to/I don't see any documentation on these things, so I don't see why anyone would be tempted to buy them....Tim

author: magudaman
author_rank: Contributor
timestamp: September 03, 2023, 06:58:06 pm
content: Thank you for the link. That looks like dc/dc board the from same builder who makes this board.The hope would be to get it working and do some testing so other could have ways to make multi-kilowatt inverters for $200. Took a chance and might loose my $100 or so invested into the setup so far.
IGBT MOSFET parallel soft switch - Have anyone real experience? - Page 1
Forum section: electronics / projects

author: Miyuki
author_rank: Frequent Contributor
timestamp: April 22, 2016, 11:55:09 am
content: HiI want to askI read studies about IGBT and MOSFET paralleling to achieve soft switch and get benefits from both worldsBut have anyone real project experiences ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 22, 2016, 12:35:06 pm
content: I've seen it suggested before. Always seemed silly. If you're going to spring for the cost of two transistors (or more if paralleled) and drivers, and the control/sequencing circuitry, why not...simply throw more MOSFETs at it? Or go to a more expensive kind e.g. GaN, SiC?You also run into problems with trying to resolve or avoid reverse recovery effects, when implementing this in synchronous switchers, usually with diodes present (MOSFET body diodes, IGBT co-packs?).Tim

author: Miyuki
author_rank: Frequent Contributor
timestamp: April 22, 2016, 01:53:02 pm
content: I want to write that big mosfets are expensive, but when I check actual prices of things like Infineons CoolMOS and speed of fast Trenchstop there is no reason to paralleling it they have almost same parametters

author: Circlotron
author_rank: Super Contributor
timestamp: April 25, 2016, 08:40:24 am
content: Quote from: Miyuki on April 22, 2016, 11:55:09 amHow old is that study that you read? For example, I have papers talking about how to commutate SCRs to make a 3-phase variable speed motor drive. Very interesting stuff, but you would do it way differently nowadays.

author: Miyuki
author_rank: Frequent Contributor
timestamp: April 25, 2016, 09:50:36 am
content: Ever relative new 2013 pairing IPW60R041C6 and IKW75N60T and get about 20-30% less power lossBut today is available faster IGW75N65H5 with this lower switching lossWhat a fast development
IGBT not working? - Page 1
Forum section: electronics / projects

author: dilbert
author_rank: Contributor
timestamp: June 23, 2014, 09:37:47 pm
content: Hello, it's nice to be back! I did this board for a wire-fusing purpose: it ignites rocket engine propellant by fusing a 0.5mm^2 NiCr wire attached to "P+ P-" connectors. Fusing the 25mm wire can require as little as 5A*0.05s to 25A*0.5s(ambient temperature, wire is not uniform, contact resistance..)B+ and B- are the 13,4V LiPo connectors, F is the +5V arduino signal(supposedly continuous, but makes my UT-61E autorange oscillate like crazy),and GCE are the IGBTwww.irf.com/product-info/datasheets/data/irg4pc50f.pdfpins.Trouble 1:when tested with a led+resistor it worked only when swapping C and E(?)Trouble 2:In the first led test the IGBT stayed on, i figured it was due to the gate insulation coupled with an small capacitance. Adding the 100K bleed resistor to the negative rail seemed to solve it.Trouble 3:when testing with the NiCr wire it didn't work

author: tom66
author_rank: Super Contributor
timestamp: June 23, 2014, 09:59:34 pm
content: 5V is not enough to put a typical IGBT into full conduction. You need about 10 to 18V to saturate it.Why not use a logic level MOSFET? IGBTs have little use below hundreds of volts. Their main advantage is at high breakdown voltage they offer low on resistance (because their characteristic is diodic, rather than ohmic.)

author: rob77
author_rank: Super Contributor
timestamp: June 23, 2014, 10:20:42 pm
content: please post the schematic diagram.... according to the traces on the board it looks like pure
IGBT pulse driver question - please critique this design - Page 1
Forum section: electronics / projects

author: daqq
author_rank: Super Contributor
timestamp: June 25, 2015, 10:57:48 am
content: Hi guys,For a project I am working on I need to be able to switch an IGBT transistor pretty fast on and quickly off - the actual pulse duration should be between 1.5 and 7 us, with a relatively small repetition rate - less than 2000 pulses per sec max. Add to that very little propagation delay.Attached is something I've designed for this purpose. It is a driver, running from +/-15V and driven by 5V logic.To explain:The IMPULSE_POSITIVE line when set to high will quickly power up M10, which will open M7. This will open a very low resistance path between the positive capacitor bank and the GATE output (simulated as C27 - very rough analogy - I know). The IMPULSE_POSITIVE will not stay on long - just several hundred nanoseconds - just enough to fully charge the GATE.The IMPULSE_NEGATIVE line when set to low will quickly open M9, which in turn will open M8, which will suck out the charge into the -15V bottom capacitor bank. The IMPULSE_NEGATIVE line will be on a little longer.When closed/inactive, the default states of the transistors are set by the pull up/down resistors (R21, R19 and their counterparts R20 and R18).At the output terminal there are two clamp diodes (D4 and D5, in reality I will use something with a little more power) to prevent any sort of nasty being made by the power circuit from getting back into the driver, and two current limiting resistors R22 and R23.There will be some output drivers for the IMPULSE_NEGATIVE and POSITIVE lines, some logic to prevent them from being turned on at the same time, etc. The reason for the AC coupling (C8 and C9) is that in the case of a lock up of the control system, the lines device will default to a safe state.The inductors are a very rough simulation of a few parasitic effects.For the real device the capacitor banks should be made up of ceramic 50V 4u7 caps X7R. Other transistors will be chosen as well.So, my questions are:Will this work well for driving these:http://www.farnell.com/datasheets/1926728.pdfIs this a reasonable solution for the described task?What would you improve?Thank you,David
IGBT switching faster than the gate signal - Page 1
Forum section: electronics / projects

author: Phoenix6478
author_rank: Contributor
timestamp: February 22, 2018, 09:40:28 am
content: Hello everybody,I am new here.I am building a DRSSTC using IGBT Bricks and everything is working fine but i have a question: My rise/falltimes are always very slow at the gates of the IGBT's (over 1uS), but if i measure the output of the H-Bridge while the primary circuit is connected, i get super fast switching times (120nS/80nS).Why are the Bricks switching faster than the input gate signal? I know that this is a good thing because then i get less losses. Is the higher primary current somehow supporting the switching process?Greetings,Phoenix

author: Whales
author_rank: Super Contributor
timestamp: February 22, 2018, 09:51:10 am
content: (Not familiar with IGBTs, assuming they don't have any fancy input latching)The IGBTs are acting as amplifiers during the short switching period. A small amount of voltage/current rise on the input creates a large amount at the output.The result is the output looks like it's changing faster than the input.

author: Phoenix6478
author_rank: Contributor
timestamp: February 22, 2018, 09:58:59 am
content: Thank you for your fast responseI am using SKM200GB128D Bricks from Semikron. The whole setup is running at 75kHz via Feedback and soft switching. So i can get away with slow rising times at the gates and without to much losses?

author: danadak
author_rank: Super Contributor
timestamp: February 22, 2018, 11:53:02 am
content: This might help -http://www.ti.com/lit/ml/slua618/slua618.pdf

author: filssavi
author_rank: Frequent Contributor
timestamp: February 22, 2018, 12:56:58 pm
content: The raise and fall time of the gate pulse are not reallylinked to the switching time of the IGBT, apart from the obvious maximum frequency limitations (you have to fit a full raise and fall time in a period)once past the treshold voltage the switching speed depends on how much current you can pump into the gate to charge it's capacitance up to the desired voltageanother thing that you have to keep in mind is that the switching times you find in the datasheet are specified at Ic=150A Vce=600V 7ohm gate resistance and +-15V Vgsand since I doubt you are switching 90 kW (I guess you are switching high-ish voltage at a lower current) the switching times at lower operating conditions will go down
runaway preventer for central vacuum system - Page 1
Forum section: electronics / projects

author: RustyShackleford
author_rank: Regular Contributor
timestamp: November 19, 2022, 10:38:37 pm
content: This is another swag at something I posted about a couple years ago:https://www.eevblog.com/forum/projects/runaway-protection-for-central-vacuum-unit/msg3464712/#msg3464712My house has a central vacuum system. This consists of a power unit containing a large suction motor, and a series of pipes and outlets around the house. Following the pipe system is a pair of low-voltage wires. Whenever a device is plugged into one of the outlets, the low-voltage wires are shorted together; this activates a relay within the power unit, which in turn energizes the motor.On one occasion, when I was not at home, the low-voltage wires became accidentally shorted together, and the motor ran for some hours before I came home and discovered the problem. Needless to say, this isn't a good thing. (However, the manufacturer claimed it probably wasn't as harmful as I feared, since the thing wasn't moving any air - since the entire pipe system was more or less sealed - and thus no "air watts" were being expended. Not sure I buy this, although he's right that the motor survived). At any rate, for my own amusement if nothing else, I'd like to design an apparatus to prevent this from happening again.What I have so far is shown in attachment below.I re-visited this when I came across this LTC6995 timer, which seems to be made for such things (https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6995-6695-1-6695-2.pdf). I've adapted the application shown on the top of page 23. In my circuit, switchSW(far left) represents the low voltage wires that are shorted when the system is to be activated.Rcoilrepresents a small relay that I will use to short the contacts to the power unit (that the low-voltage wires normally connect directly to); the internal relay operates a 24vac, and this seems like the easiest way to interface my circuit with it.V1is just a small 5vdc wall wart.Timing of the IC is shown below (RSTbarison_callandOUTistime_out). Basically, when the low voltage wires are shorted,on_callgoes hi, which causes the timer to begin. Becausetime_outis low, the pfet pulls high and the relay coil is energized. If user simply turns the thing off, the pfet remains turned-on, buton_callis low so the coil is not energized. If the thing runs too long (accidental short in low-voltage wires),time_outeventually goes hi and turns off the pfet; so the coil is de-energized even thoughon_callis still high.Thoughts ?If something weird does happen with the low voltage wires, it's likely to be intermittent. I'm not sure how to handle that. Another timeout before the thing is allowed to turn on again could handle that. Simplest might be an RS flip-flop that traps a high-signal ontime_out- keeping it high until the system power is cycled, and illuminating an error LED).
ILI9488 brightness settings - Page 1
Forum section: electronics / projects

author: Denge
author_rank: Newbie
timestamp: December 12, 2024, 01:25:03 pm
content: Hello All,I'm struggling with adjusting the brightness of the ILI9488 display.I used the "Write Display Brightness Value (51h)" and the "Write CTRL Display Value (53h)" command but nothing changes :-(Anyone an idea how to correctly adjust the brightness of the display?Thanks for helping.

author: ftg
author_rank: Frequent Contributor
timestamp: December 12, 2024, 01:33:16 pm
content: The backlight might be driven completely separately, with the ILI9488 having no control over it.

author: Denge
author_rank: Newbie
timestamp: December 12, 2024, 01:53:54 pm
content: What are these commands then used for??

author: ftg
author_rank: Frequent Contributor
timestamp: December 12, 2024, 03:01:42 pm
content: They are used for controlling the backlight brightness, if the required PWM mosfet has been fitted on the board and the PWM_OUT pin is connected to it.It would help knowing if you are using a bare panel and it's model or if it is some module.If it is a module and there is two separate terminals (LED+&LED- or LED_K & LED_A) for the backlight led, then ILI9488 likely has no control over it.

author: Denge
author_rank: Newbie
timestamp: December 12, 2024, 03:48:10 pm
content: This is the module I have, with the touchscreen chip populated although.Strange that I can't adjust the brightness on this one!Are there other commands involved influencing the "Write Display Brightness Value (51h)" command?

author: ajb
author_rank: Super Contributor
timestamp: December 12, 2024, 04:38:08 pm
content: I see a pin labeled 'LED' on the header, so you might need to use that to control the backlight. A lot of LCD controllers like the ILI9488cancontrol the panel backlight, but that does not mean the panel manufacturer built it that way. Although there may be another control register to enable/configure the brightness control that you need to mess with.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 13, 2024, 02:14:57 am
content: Yes, most of these boards do not connect the backlight PWM pin of the controller IC to the transistor driving the backlight LEDs of the panel, and the PWM pin is rarely made available either, so that's typically not something you can do by simple wiring. I'm afraid you'll have to PWM the BL signal yourself.
ILI9488 in RGB Mode - Page 1
Forum section: electronics / projects

author: MaTech
author_rank: Newbie
timestamp: July 20, 2018, 09:04:53 pm
content: I'm working on a project involving a TFT LCD with an ILI9488 Driver (This Model:https://www.buydisplay.com/default/serial-spi-3-5-inch-tft-lcd-module-in-320x480-optl-touchscreen-ili9488).As mentioned in the Subject I want to run the LCD Driver in RGB Mode in conjunction with an PIC32MZ2025DAH176.To do, so I have to select the correct Mode (RGB) over 3-line SPI with 9bit (Bitbanged) that works fine and shows also as the correct Data on both my Scope and on my Logic Analyzer.If I read the registers back everything looks as expected, but when I activate the RGB signals in my case I'm using the Graphics Stack with the GLCD Controller in MPLABX Harmony I got nothing back over SPI.I also watched that certand registers can only be edited when the corresponding Lines (YSYNC,HSYNC,...) have the right states (HIGH?). I implemented these states, but I still can't get anything over SPI when using the Graphics Stack.Has someone tried using this Driver in RGB Mode before or has Experience with the Graphics Stack in Harmony maybe their is something to change??Thanks in advance.
ILI9488 - No frame buffer? And related implications for static images...? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: April 23, 2022, 08:21:07 pm
content: Hi,first time designing with ILI9488: elecrow.com/download/ILI9488%20Data%20Sheet_100.pdfI am using MCU data bus interface (18-bits wide). On page 137 it says "Normally, the ILI9488 has no frame buffer of its own, so all image data shall be supplied by the host processor at asufficiently high rate to avoid flicker or other visible artifacts."That wording implies that the controller itself doesn't have a frame buffer BUT that paragraph is under the DSI Transmission Data Format and nowhere else anything similar is mentioned. That would imply that it is somehow relevant only to the DSI bus interface - which I am not using - and not to the MCU or RGB interfaces. Is that so? How can that be?If I am using MCU or RGB interface and want to display a static image, do I have to continually update the display? That seems absurd...Also not sure why it says "Normallyit has no frame buffer of its own". The display I am using does not mention anything about buffer. Datasheet attached below.Many thanks

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 23, 2022, 08:58:26 pm
content: It's a bit confusing, but possibly because of the language barrier, so the translation is not ideal.This controller has GRAM as stated in the DS. The confusion comes from the fact that you're looking at the DSI interface, which is one of the interfaces this chip offers, and which is basically a constant stream of data such as for HDMI, if you will. In this mode, you're supposed to constantly feed the controller with pixel data in the right order, or it will stop displaying properly. Like an HDMI monitor.Unless you have a particular reason for using DSI, you should use one of the parallel MCU interface modes (or SPI). In those modes, you can only update the GRAM content and issue commands, and you don't need to constantly feed the display with new data if the image doesn't change.

author: DavidAlfa
author_rank: Super Contributor
timestamp: April 24, 2022, 12:40:00 am
content: It's has framebuffer of 320x480x18bpp, but used in mcu bus mode (8080, 6800), it's very different from RGB or DSI, these provide the pixel clock, data, sync... interfacing the lcd matrix directly.You can see RGB or DSI as HDMI or displayport. They provide a constant flow of data.If you want to send data only when required, you should use mcu bus mode.

author: ricko_uk
author_rank: Super Contributor
timestamp: April 25, 2022, 12:59:12 pm
content: Thank you SiliconWizzard and Davidnow it does make sense!
ILI9811c TFT driver initialisation - Page 1
Forum section: electronics / projects

author: Simbarashe Bryne Chipembe
author_rank: Contributor
timestamp: November 10, 2017, 08:31:55 am
content: Hi guys,I got an LCD with the ILI9811c driver chip and I cannot find a library online for the driver. Has anyone ever used the driver before? The LCD is an 800*800 pixel LCD with a3 lane MIPI interface. I found a parallel 16bit toMIPI 2lane bridge from solomon, part number SSD2805. Any ideas?

author: ebclr
author_rank: Super Contributor
timestamp: November 10, 2017, 09:43:23 am
content: With some luck can be similar to this one as referece"https://www.crystalfontz.com/controllers/Ilitek/ILI9806H/"
Illuminated pushbutton matrix - Page 1
Forum section: electronics / projects

author: Messtechniker
author_rank: Frequent Contributor
timestamp: May 25, 2020, 02:13:18 pm
content: Because of space restraints I need a 2x2 matrixof illuminated push buttons similar to the ones depicted.What is the precise designation for these? And where can I get them?The ones depicted are certainly custom made, but I hopethere are some standard parts somewhere.Also hope they are of the resistive type so that I will not need a decoder.Searching "Illuminated push button matrix" or similar onlygives terrible results.PS:2 hours later: got it. I'm apparently looking for "LED silicone rubber keypads".
illuminated pushbuttons pcb mount (SMT if possible) with caps... where ? - Page 1
Forum section: electronics / projects

author: free_electron
author_rank: Super Contributor
timestamp: September 11, 2018, 02:37:49 am
content: I am looking for nice illuminated pushbuttons. preferrably SMD , but through hole is ok too.The key (pun intended) is a good click feel and nice shape. I really like the MEC switches but ..1 - too expensive2 - hard to get3 - don't like the click feelThere is plenty of pushbuttons around but finding the keycaps is always an enormous problem...Colors i am not picky. black or grey will work. other colros woudl be nice too.No legends required.Illumination is required. preferrably bicolor or RGB.

author: free_electron
author_rank: Super Contributor
timestamp: September 11, 2018, 04:31:40 am
content: nope. i'm not looking for keyboard switches.i am looking for switches to make instrumentation control panels.i need navigation buttons (5 way ) . Think oscilloscope or function generaotr user interface.

author: JPortici
author_rank: Super Contributor
timestamp: September 11, 2018, 06:20:36 am
content: you could ask on muffwiggler / synth DIY and eurorack pusherman group on facebook or on other eurorack synth communities.At first people were looking for cheaper alternatives to LP4OA1PBCTR but then someone found out manufacturers that would make custom caps, with custom shapes and even custom colours for apparently not so much. For the life of me i can't remember who they were as this was about one year ago

author: MasterBuilder
author_rank: Regular Contributor
timestamp: September 12, 2018, 02:06:43 pm
content: I think finding good SMD pushbuttons with caps is a problem. Most good ones Ive seen are through hole.My favourite illuminated (not cheap) THT pushbutton are these Digitast brand:https://uk.rs-online.com/web/p/keyboard-switches/1742884/

author: free_electron
author_rank: Super Contributor
timestamp: September 13, 2018, 06:58:17 pm
content: Quote from: MasterBuilder on September 12, 2018, 02:06:43 pmi used to love digitast in the 80's.. but in 2018 they are 'dated'...i'm not stuck on surface mount, through hole is fine , but it needs modern look. oblong buttons, concave,convex.i realy really like the MEC products .. but DOUBLING my BOM cost to add 12 switches with caps ? not so ...
iLoq - self-power generating electronic lock teardown - Page 1
Forum section: electronics / projects

author: Tuppe
author_rank: Contributor
timestamp: January 28, 2017, 12:04:12 pm
content: Hi,I was interested to see how this self-power generating electronic lock works, so I disassembled it.I thought someone else might also find this interesting, so I decided to post reverse engineering stuff here. I did this just out of curiosity.It works by generating the power from the key push-in motion. It has SHA encryption which is taken from the key using 1-wire protocol. The MCU is most probably Maxim Deepcover series.Here's some patent information:https://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Iloq+Oy%22I got few questions, if someone more experience can spot what is going on (images in attachements):1. The generator goes directly to chips 2 and 3, which have exactly the same configuration. Both have 0328 marking. What these components are? LDO?2. Chips 4 and 5 are weirdly connected to power and MCU and have SGAJ marking. What these components are? MCU regulator?3. Chip 6 is next to microcontroller, with SICX marking. What this might be?I think the layout should be fairly trivial to anyone with experience in electronics design. If someone wants to get some more information, I can take a closer look of it.Here's a video of how the lock operates (not my video). Motor and PCB on the other side of the lock:The lock is opened using the same motor that generates the power. Because the motor actuates only a tiny motion to unlock so I assumed there is a possibility to bypass the lock using high power magnets. I couldn't actuate the lock using small neodymium magnets. Is it possible for the motor be 100% shielded so that not even a monster magnet attached to a power drill can open it?

author: MrAureliusR
author_rank: Unknown
timestamp: January 30, 2017, 07:59:23 am
content: I'm having a really hard time following your hand-drawn schematic.. any chance you could lay it out in a schmatic capture software?
ILS LOC composite waveform - Page 1
Forum section: electronics / projects

author: m98
author_rank: Frequent Contributor
timestamp: March 27, 2022, 09:36:28 pm
content: Hi,this might be a bit of a specialized question I could probably answer myself with more effort, but I hope someone might just have an answer ready to go. So basically, I want to generate an ILS localizer signal for the composite input of a CDI.From what I found, the expected input signal should just be two sine waves at 90 and 150 Hz added together, with the ratio of the amplitudes of the tones determining the needle deflection. I also thought about the ILS energize input, connected that to ground as mandated for ILS operation. Still, my KI 203 doesn't seem to be too impressed, nothing happens at all. I've already implemented a VOR signal, that works just fine. So before I proceed further, is my assumption as how the signal should look like even correct?

author: m98
author_rank: Frequent Contributor
timestamp: March 27, 2022, 10:40:14 pm
content: Small update, it can't be too wrong, as deflecting the needle actually seems to work as intended. Only problem, the NAV-flag still stays up, despite the signal being a little over the required 360 mV RMS.

author: MuseChaser
author_rank: Contributor
timestamp: March 27, 2022, 10:57:59 pm
content: I don't mean to be "that guy," (an expression that means someone who, uninvited, finds negative thing to say about any endeavor or opinion), but I'm curious why you're doing that, unless you operate an airport. Are the signals you're creating at an insignificant enough power not to be able to be received by any aircraft on any frequency they use? I can imagine stray ILS signals creating some VERY dangerous situations for pilots and their passengers.

author: m98
author_rank: Frequent Contributor
timestamp: March 27, 2022, 11:09:20 pm
content: I'm only emulating the IF signal coming out of the aircraft radio, so no, there is absolutely no possibility that this could interfere with an aircraft.The goal of my project is to just hook up a real CDI to use with a flight simulator.

author: MuseChaser
author_rank: Contributor
timestamp: March 27, 2022, 11:39:29 pm
content: Thanks... I didn't realize you weren't broadcasting them, but rather feeding them directly to the CDI without the use of the radio. My apologies.
iluminating decal - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: October 17, 2012, 04:51:22 pm
content: I'm looking for a supplier of a plastic like material that will illuminate when a voltage is applied. The one I have as a sample takes just 0.25V to start glowing. the decal is printed on top, with some areas left blank and any non black colour lights up.

author: SeanB
author_rank: Super Contributor
timestamp: October 17, 2012, 05:52:51 pm
content: So you are looking for OLED suppliers then? Nice but remember they are rather limited both temperature and life wise.

author: Simon
author_rank: Unknown
timestamp: October 17, 2012, 05:58:40 pm
content: well we have been given a kit at work to replicate. so we need to provide compatible parts,

author: Simon
author_rank: Unknown
timestamp: October 18, 2012, 09:07:52 am
content: does anyone know of a company that makes decals with OLED "backlighting" ? What is the typical voltage of OLED ? this one is running at about 0.25V and just glows, perhaps they did this to prolong life ? apart from the fact that as part of a vehicle panel it only needs to be visible at night.

author: Psi
author_rank: Super Contributor
timestamp: October 18, 2012, 11:02:23 am
content: There's electroluminescent panels, but you have to drive them with high voltage, so it gets more complicated.They're used for exit signs, clothing logos, display stands etc.

author: Simon
author_rank: Unknown
timestamp: October 18, 2012, 11:09:52 am
content: no that won't work I'm afraid. we have a 24V vehicle supply and are hoping to match what we are copying so that we can supply replacements for their old kit as well. I'd not want to be stepping up voltage but I suppose if i speak forcefully enough I can convince them that is we supply a replacement decal we stipulate that the regular comes with it as a kit and needs changing too. They have a small potted box that takes 24V in and puts out 0.25V (or less !)

author: Psi
author_rank: Super Contributor
timestamp: October 18, 2012, 11:15:32 pm
content: Maybe you could find a light pipe that is designed to illuminate a panel sticker from a white led?

author: Simon
author_rank: Unknown
timestamp: October 19, 2012, 06:27:48 am
content: light pipe ? would that provide an even light though ?, I can't find any UK supplier, perhaps we can get just the oled panel and put a decal on it
Im confused about charging 3s4p - Page 1
Forum section: electronics / projects

author: Ehaze
author_rank: Contributor
timestamp: November 28, 2021, 04:26:20 pm
content: So if I put 4 cells in parallel , and then 3 of those in series. Made up of 18650 cells , to get 12ish volts .I want to charge that from a wall outlet . So I have some drone stuff and I found an Iflight M4ac balance charger 1-4s .Can that take the place of a BMS , or will I have to find a BMS and balance cable , and or still use the iflight charger to display the 4ps?How does the BMS or Iflight know each of the 4 Ps is balanced ? Will each one see them as one cell if in parallel.Sorry this gets confusing for me . Youtube videos show me how to build it but I am learning the rest through asking question about what is correct .Also if I have 1 group of 4 18650 cells in parallel , do i need a balance wire for each cell or just 1 for the pack ?

author: sleemanj
author_rank: Super Contributor
timestamp: November 28, 2021, 08:58:48 pm
content: Parallel cells are effectively balanced by definition (but only connect cells in parallel when they arealreadythe same voltage). Balancing is in regards to series cells only.A "BMS" monitors cells during discharge (and charge) to ensure that they do not get too-high voltage, too-low voltage, or too-high current.Since you do not have your battery charger connected when you are discharging the cells, you should have a "BMS" or "Protection" board to do that built onto the pack preferably.Your charger is capable of balancing the cells, sometimes a BMS board is capable of that also, you need to examine the capabilities of the BMS.

author: Ehaze
author_rank: Contributor
timestamp: November 30, 2021, 02:42:44 am
content: ok so I think I still need to wire in the balance lead so the charger can see the 3Ps , The charger uses a xt30 and jst connector , so i guess its just like charging my drone batteries ? I still need a bms board as a protection device , but i cannot find one that is clearly a good product , Amazon is no help , they have many but where do people get reliable products from ?
I'm looking for a battery charger + circuit protection for my DIY tablet - Page 1
Forum section: electronics / projects

author: ziomario
author_rank: Contributor
timestamp: January 21, 2025, 01:38:50 am
content: Hello to everyone.I'm trying to create a DIY tablet for me using the following components :a) battery charger + protection circuithttps://www.amazon.co.uk/Yushu-Universal-Battery-Mobile-Charger/dp/B09ZQFQLSW?nsdOptOutParam=trueb) 3 x 18650 batteries (model LiitoKala)c) enclosure :https://pine64.com/product/pine64-playbox-enclosure/What's my problem ? that the battery charger's height is 2.7 cm and it does not fit inside the enclosure.I need to find another battery charger (with protection) that has a maximum height of 2 cm ; max lenght = 13 cm ; max width = 10 cm.Or a solution to be able to keep the batteries and the circuit within the space that's available (maybe using a different enclosure,but in this case I think that is hard to transplant the circuit and the batteries to the new case)I think that asking to a company to print for me a customized 3D case will cost more money.Please help me,thanks.

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: January 21, 2025, 01:16:40 pm
content: I think 3D printing a customized case is the solution now.

author: tunk
author_rank: Super Contributor
timestamp: January 21, 2025, 01:44:20 pm
content: (Sorry, deleted, not relevant.)Edit: Get three 18650 battery holders, take thePCB out of the Yushu box and solder it together.There should be (just) enough space for it.
Image detection or object detection  - Page 1
Forum section: electronics / projects

author: yashrk
author_rank: Frequent Contributor
timestamp: June 16, 2015, 08:10:27 am
content: Hey guys,I am working on a project in which I have to detect/track an ir led using a camera I have yet not fixed upon which hardware or software to use so please guide me and let me know of all option that I have and suggest which will be fit for me. Or which will be easyThank you guys,YashRK.

author: mikerj
author_rank: Super Contributor
timestamp: June 16, 2015, 08:32:50 am
content: You might want to investigate the Nintendo Wii controllers, these work by having a camera at the front detecting the position of two IR LEDS.

author: eas
author_rank: Frequent Contributor
timestamp: June 18, 2015, 12:37:31 am
content: For prototyping,Pixymight be useful. Its a board + camera + firmware and companion apps for configuring/training it to do some common computer vision tasks.Note: I've never used Pixy.

author: MrMetthew
author_rank: Regular Contributor
timestamp: June 21, 2015, 06:24:02 pm
content: You can cheaply buy plastic infrared-passing filters. Those are plastic filters which only pass infrared light. Just mount them in front of a your camera and the image recorded by your camera should (kind of) only show the ir led (and other ir sources). On that data it shouldn't be to hard to figure out an algorithm which tracks the led. Assuming you dont have track the led to accurately I would guess just a very cheap vga camera modulle would do just fine, maybe with some kind of lense. I don't know what your after, at which frequency you want to update the location of the ir led. But if your project isn't to demanding I'm sure you could implement it on a simple pic or atmel microcontroller, be aware that decoding the vga signal on the pic or atmel can be a bit of a pain if you haven't done it before. If your application is more demanding, maybe you can use an extern vga chip combined with your microcontroller. Also you could use a fpga, which would be a nice solution imo, maybe a bit overkill. I'm at the moment myself working on an application where a vga camera get's read out by a fpga and some, more extensive than in youre case, videoprocessing get's done on the incoming frames. The fpga approach ofcourse is very nice because you can read the incoming vga stream at the same time your calculating on the last frame, due to the parallel working nature of fpga's. Maybe there are superior approaches, but this how I think I would start off your project at my current knowledge level.