hybridfree/eevblog-posts huggingface dataset:
cut pattern to modify fat shunt - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: February 02, 2020, 03:41:47 am
content: So I have a shunt hooked up to a meter (kelvin, mOhm), and I want to cut it in order to increase its resistance if possible, probably with a dremel.What cut pattern is good to use (I guess similar to what they do with laser cutting foil resistors?)It's one of the chinese ones that connects to a panel meter, the idea being to reduce a 50A shunt to 5A so the scales work.I was going to use a serpentine cut

author: SeanB
author_rank: Super Contributor
timestamp: February 02, 2020, 04:45:52 am
content: Is it AC current, where using a current transformer will probably be a better bet. A small strip toroid ( or an old small mains transformer you have cut the windings off without disturbing the core itself) with a secondary of 1 turn of thick copper wire, around 16mm, and a primary winding of 10 turns of 1mm copper wire. Simple, reliable and much lower error as well instead of destroying the shunt itself.I use one to increase the sensitivity of a regular power meter, as I wanted it 10 times more sensitive, so used an old 35W toroidal transformer for the core, and the current sense winding now is running at 8A peak , but the internal sense coil still has up to 80A flowing in it.
Cute 1980s SMT capacitor - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 27, 2024, 06:51:49 am
content: Inspecting a 1988 hard drive PCB before powering it up and saw a trapped SMT capacitor.I think through-hole assembly was still so much cheaper than surface mount that it was somehow worth the cost to encapsulate SMT parts in a leaded package for assembly.Isn't this weird and wonderful?

author: ebastler
author_rank: Super Contributor
timestamp: October 27, 2024, 07:19:36 am
content: Neat, aren't they? Some discussion here, including a scanned old datasheet:https://www.eevblog.com/forum/metrology/mlccs-encapsulated-in-glass/
Cutting down on PCB parts. - Page 1
Forum section: electronics / projects

author: BoKKeR
author_rank: Contributor
timestamp: January 25, 2018, 04:40:19 pm
content: Hey, I know this might be stupid. I am running 4 Oled 1.3" displays from my PCB. Each of the Displays has its own set of 2.2uF capacitors 6 pieces (used for filtering???) and 2 resistors. my question is could I cut down on the parts and just use the same set of capacitors for all the displays?Board:Datasheet:http://www.buydisplay.com/download/manual/ER-OLED013-1_Series_Datasheet.pdfSchematics:

author: james_s
author_rank: Super Contributor
timestamp: January 25, 2018, 10:17:59 pm
content: No, in most cases those capacitors are used in charge pumps that develop the various voltages needed by the display. I think you would have problems trying to share them, especially since the voltages are usually enabled at various times by the code that initializes the display. Surely it's not worth the bother just to eliminate a few pennies worth of capacitors?

author: BoKKeR
author_rank: Contributor
timestamp: January 25, 2018, 10:22:08 pm
content: thanks for the info. actually its more about the pcb space but I will just have to move around all the other components until everything fits.
Cutting EL Panel - Page 1
Forum section: electronics / projects

author: don.r
author_rank: Frequent Contributor
timestamp: November 09, 2019, 08:18:34 pm
content: I purchased a small EL panel and was wondering is there are any recommendations on the best way to crop it to size. Its both a little tall and long for my application. Obviously I need to center the cropping on the pins. Anything else I need to worry about?

author: Gyro
author_rank: Super Contributor
timestamp: November 09, 2019, 08:33:45 pm
content: At a guess... Atmospheric moisture ingress and possible delamination, causing degradation of the phosphor around the edge. Also the possibility of creating localised shorts between the upper and lower conductors.I don't know for sure but I think they are edge sealed.

author: don.r
author_rank: Frequent Contributor
timestamp: November 09, 2019, 08:44:48 pm
content: I could mitigate the environmental effects by sealing the cuts in Scotch tape.

author: don.r
author_rank: Frequent Contributor
timestamp: November 11, 2019, 10:16:29 pm
content: I temporarily attached the new panel to the device and the light output is still very low. I measured the voltage from the driver and its only 16VAC rather than the 75VAC it should be. Looks like its the driver (a self-contained piece of unobtainium) rather than the panel. I'll hack in a modern driver and see if it works.

author: Zero999
author_rank: Super Contributor
timestamp: November 11, 2019, 10:47:04 pm
content: Quote from: don.r on November 11, 2019, 10:16:29 pmYes, that doesn't sound good. The driver is probably fairly simple, quite likely a Royer converter.Quote from: don.r on November 09, 2019, 08:44:48 pmI'm not sure that will work, since moisture will still get in. I think a clear lacquer will be better

author: don.r
author_rank: Frequent Contributor
timestamp: November 11, 2019, 10:52:06 pm
content: Quote from: Zero999 on November 11, 2019, 10:47:04 pmI could open it up via a dremel and have a look but a new driver is less than $2 so...QuoteHopefully I won't need to go there right now but I'll keep that in mind for next time.

author: don.r
author_rank: Frequent Contributor
timestamp: January 17, 2020, 09:44:53 pm
content: Finally got around to completing this after all the holiday business was taken care of. Got a $2 USB EL driver from Aliexpress and it works just fine in the Keithley. Will save the EL panel for future use.
Cutting silicon-bonded mica spacer washers - Page 1
Forum section: electronics / projects

author: TerraHertz
author_rank: Super Contributor
timestamp: February 14, 2018, 09:34:01 am
content: At the moment I'm building myself a vacuum-hold-down regulated temperature hotplate, for disassembling things like iPads.As a side note, I thought I'd show a way I found to cut stand-off washers out of thick silicon bonded mica sheet. Which is much like mica insulating washers for transistors, but thick.In this case I'm using 5mm thick sheet. I didn't need electrical insulation, just a 5mm standoff that could take 300 deg C, with reasonably low thermal conductivity, and something that definitely wouldn't crack under mechanical strain like ceramic insulators could.This stuff is highly temperature resistant, and tough under compression. But it de-laminates very easily. You can't cut it with things like punches, saws or hole saws, since it just splits into thin sheets. The place I bought some offcut sheets from (Associated Gaskets, Revesby), has a water jet cutter and can cut it cleanly in any shape. But for those without a water jet cutter, there is still a way to cut simple round shapes like washers.The trick is to keep it under strong compression while cutting. In that condition it cuts neatly with ordinary drills and cutting bits.So for washers, two jigs are needed. One to drill the center holes with a drill press, and one to turn the outside surface in a lathe. Both are pretty easy to make. The pics should make it obvious.I drilled the holes in a single offcut piece, then separated them roughly using a thin cutting disk in an angle grinder. This stuffs the mica sheet for a few mm either side of the cut, so just make the cuts well away from your part edges. The material is very easy to turn in the lathe, so wildly irregular initial outlines don't matter. Just apply lots of compression to the jig using a live center in the tailstock.The resulting washers are 5mm thick, center hole 5mm, OD 16mm.
CVBS (Analog video) to HDMI conversion IC - Page 1
Forum section: electronics / projects

author: Jadon
author_rank: Newbie
timestamp: September 05, 2022, 02:52:00 pm
content: I've been attempting to find a solution to converting an SVBS video signal to HDMI (1080p/30fps) hopefully using a single chip. I found a chip which accomplishes exactly what I need, the MS1858E by macrosilicon. The only issue is that I can find almost nothing on the internet about this IC nor can I find it in stock anywhere. I have found one or two other chips but they are either not manufactured anymore or are just way overkill for what I need to accomplish.Ha anyone got any advice on the easiest way to do the conversion using a chip that preferably uses less than 100+ pins? Or another solution entirely?

author: Benta
author_rank: Super Contributor
timestamp: September 05, 2022, 06:48:41 pm
content: Buy one of these, open it and see what's inside:https://www.keene.co.uk/marmitek-vh51-vga-to-hdmi-converter.html

author: wraper
author_rank: Unknown
timestamp: September 05, 2022, 07:13:28 pm
content: Quote from: Benta on September 05, 2022, 06:48:41 pmWhy would he bother looking into VGA adapter.As of video converter chips, IME researching them, they basically never come with full (useable) datasheets which are openly available. As of particular chip, it's a Chinese company so I guess you could try contacting them, if you are extremely lucky maybe they will give you a datasheet without NDA and requirement of being HDMI adopter. But your best bet is buying a dev board on taobao and reverse engineer it. I personally likely would buy a bunch of inexpensive converters and look what's inside and if ICs are available on some Chinese sales platform. Any IC with HDMI = basically forget about datasheets and components (except dodgy Chinese sources) without being a company and shelling a bunch of money to become HDMI adopter.
CVBS (i.e. analogue) camera electronics - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: September 03, 2019, 11:15:12 am
content: Hi,I'm trying to get a good quality camera interface for a specialised medical / lab application. (Good quality in terms of optical / noise parameters rather than in quantity of pixels.) I'm wondering whether old-fashioned CVBS might be helpful and I see a number of high quality / machine vision camera vendors still sell CVBS set-ups. Does anyone know what the electronics between the sensor and a typical CVBS output looks like? A generic schematic of even a block diagram would be useful.TIA, Alan
CVBS to YPbPr converter - Page 1
Forum section: electronics / projects

author: supernudo
author_rank: Newbie
timestamp: April 03, 2013, 01:57:47 pm
content: Hi everybody!I'm designing a video signal converter (as a part of a bigger system) that converts from CVBS to YPbPr format. I'm looking for a integrated solution. I know that there are commercial products in the market for that purpose, but I haven't any for teardown.Does anybody know some thing about?Thank you very much in advance!

author: free_electron
author_rank: Super Contributor
timestamp: April 03, 2013, 02:38:59 pm
content: Ycrcb. .. Ok . Yprpb.. Not so easy... The progressive scan is the killer... Cvbs is by nature i terlaced....Most commonly done using specialistic chips. . Look at micronas. They have digitizers for many formats.

author: supernudo
author_rank: Newbie
timestamp: April 04, 2013, 08:14:04 am
content: Thank you free_electron, your advice was very useful.I've found a possible solution using VP32xx + DDP3310B chips.Cheers!
CVBS/YPbPr video output for an iMX6S processor - Page 1
Forum section: electronics / projects

author: supernudo
author_rank: Newbie
timestamp: May 07, 2013, 03:54:17 pm
content: Hi guys,I'm designing a system based on iMX6S processor and it has to support a CVBS/YPbPr video interface output. The MCU has several video interfaces but all of them are digital: parallel display, HDMI1.4, MIPI and LVDS interface. For the moment, I’m thinking in use the CH7106A converter from Chrontel.Anybody know an alternative solution?Thanks!

author: yanir
author_rank: Regular Contributor
timestamp: April 13, 2014, 03:21:45 am
content: You will need an ISP in between your video source and the imx6.Sent from my iPhone using Tapatalk 2

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 13, 2014, 03:29:19 am
content: Connect some DACs to the parallel output? Depending on the video quality requirements, a few resistors might be good enough.
CX101B Display - Page 1
Forum section: electronics / projects

author: kvresto
author_rank: Regular Contributor
timestamp: October 25, 2015, 12:14:26 am
content: Hi Everyone.I want to be able to display a negative voltage in a panel meter for convenience, but from the one page data sheet of the CX101B I cant tell if I can simply feed a negative voltage into it just as I would into a multi-meter. I was going to buy one and try, but, why blow it up if it turns out it doesn't work like that.cheerskvresto.

author: Andy Watson
author_rank: Super Contributor
timestamp: October 25, 2015, 12:22:22 am
content: Datasheet says "Auto polarity", so I would assume yes - it will display negative voltage.

author: kvresto
author_rank: Regular Contributor
timestamp: October 25, 2015, 07:47:41 am
content: cheers.
CX20562-12Z Conexant USB CODEC from Plantronics .Audio 622 headset - Page 1
Forum section: electronics / projects

author: RoGeorge
author_rank: Super Contributor
timestamp: November 16, 2024, 09:15:07 am
content: Want to turn this Plantronics .Audio 622 headset into a USB soundcard for the lab. The headset's USB connector was broken (in the picture it was on the left, already desoldered), but the board is still OK. Works fine with a (long) USB cable attached instead of the PCB connector.Main destination would be as an audio input, to monitor DIY audio circuits and experiments. Couldn't find any datasheet or pinout for the CX20562-12Z chipset, only advertising flyers and block schematics.https://www.electronicsdatasheets.com/download/120530.pdf?format=pdfThe PCB has additional unused pads near the pads used to solder the headset speaker and mic (on the right hand side in the picture), which I guess might be line-input.The headset is recognized in Linux, but the soundcard control panel (in alsamixer) has no line-in volume and no other controls than volume. Either it might need specific Linux drivers, or it might need specific jumpers/bytes in the configuration flash (on the PCB there is a ST 24C32 - 32kbit (4kB) - I2C EEPROM which I assume might contain configuration bytes).I would like to reverse engineer the little PCB. Anybody knows where I can get more info about the PCB, if not a schematic (found a schematic on electrotanya, but it's for CX20561-12Z, not for CX20562-12Z (not sure what the difference is), maybe the datasheet of the Conexant chipset, or at least the pinout for CX20562-12Z, please?
CY3689 EZ-USB FX2LP problems - Page 1
Forum section: electronics / projects

author: Tangent_Tracker
author_rank: Regular Contributor
timestamp: July 24, 2023, 10:45:32 am
content: Hey, having problems installing drivers for this board. Triedhttps://www.instructables.com/FX2LP-CY7C68013A-USB-Dev-Board-Logic-Analyzer/then moved on to the official installation instructions fromhttps://community.infineon.com/t5/Knowledge-Base-Articles/Cypress-EZ-USB-FX2LP-based-Logic-Analyzer-using-Open-Source-sigrok-PulseView/ta-p/252866and am not getting anywhere!Primary issue appears to be that I cannot install unsigned drivers on my works machine.. WHen I try the offical route I can see the board in the device manager but it will not appear in the Cypress control center (which I find odd!).I can install the official Sigrok drivers and have got my 8 channel chinese device working ok with Pulseview, but I would like to get the 16 channel device up and running if possible!Is there any way round the system policy? I cannot see the IT guy changing the policy :-(

author: moffy
author_rank: Super Contributor
timestamp: July 24, 2023, 11:09:34 am
content: You will have to have permission to install the correct driver, without that you are stuck. Perhaps you could ask the IT guy to install the driver you need without having to have a permanent group policy change especially as it is work based. I think Windows only checks the certificate on installation not each time it runs, I might be wrong on that though.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 24, 2023, 03:00:47 pm
content: https://www.minitool.com/news/install-unsigned-drivers-windows-10.html

author: Tangent_Tracker
author_rank: Regular Contributor
timestamp: July 25, 2023, 09:57:22 am
content: Thanks, but sadly none of those methods seem to work :-(

author: DavidAlfa
author_rank: Super Contributor
timestamp: July 25, 2023, 12:47:57 pm
content: You must modify the vid/pid to let sigrok know it's the 16ch analyzer.https://www.eevblog.com/forum/testgear/saleae-prices/msg4533749/#msg4533749Then simply install the WinUSB driver using Zadig.Keep in mind that doubling the channels halves the sampling frequency to 12MHz.
Cylindrical IP65 case - Page 1
Forum section: electronics / projects

author: alanambrose
author_rank: Frequent Contributor
timestamp: February 15, 2017, 01:08:34 pm
content: Hi,Has anyone seen or used any cylindrical IP65 (ish) cases? This is for an application which will be used sometimes outdoors and at least temporarily exposed to the elements. Say, 70-100mm diameter 20-35mm high? Say Polycarb, ABS etc. Bonus points if it has a clear window. The usual suspects (hammond, camdenboss etc) seem to be very square in their thinking...Alan

author: DTJ
author_rank: Super Contributor
timestamp: February 15, 2017, 01:52:12 pm
content: Is reticulation, plumbing or gas pipe usable in your application? Most sizes have end caps and threaded end caps available.I've looked for similar enclosures in the past without any luck.

author: Delta
author_rank: Super Contributor
timestamp: February 15, 2017, 01:52:50 pm
content: Try an electrical supplier, i'm sure you can get circular junction boxes of suitable size.

author: DTJ
author_rank: Super Contributor
timestamp: February 15, 2017, 02:03:23 pm
content: Yeah, I'd forgotten about those. I'd looked at ones like below but they were shallow and too small in diameter.https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRrgFaJMSGaICMxbn-zVRUIihheQ2ag3w9PvwRq4ZQBFTLfXxf-qgAre there other larger ones available?

author: alanambrose
author_rank: Frequent Contributor
timestamp: February 15, 2017, 02:31:05 pm
content: BTW this is the closest I've got so far...http://www.screwfix.com/p/round-4-entry-junction-box-with-knockouts-grey-85mm/40613Cheap enough

author: Davesaudio
author_rank: Newbie
timestamp: February 15, 2017, 02:37:24 pm
content: Quote from: DTJ on February 15, 2017, 02:03:23 pmIn north america there is a "floor base" for concrete floors that is double or triple in depth

author: DTJ
author_rank: Super Contributor
timestamp: February 16, 2017, 05:06:52 am
content: http://sell.pakuya.com/product-info/69029/JH-6128-Aluminium-Profile-with-circular-profile.htmlhttp://www.rolec-enclosures.co.uk/products/aludisc.htm

author: neil t
author_rank: Regular Contributor
timestamp: February 16, 2017, 05:14:06 am
content: Type clear acrylic tube into ebay although I've only seen 70mm there maybe larger sizes, in my case I would turn up some pvc caps on my lathe,its possible that standard plumbing pvc may fit. sorry I haven't figured out how to do links yet, (not tech savvy).regards Neil

author: DTJ
author_rank: Super Contributor
timestamp: February 16, 2017, 07:21:42 am
content: Neil, to post links just copy the link text from the browser and post it as text in the comment space.

author: neil t
author_rank: Regular Contributor
timestamp: February 16, 2017, 07:29:31 am
content: http://www.ebay.com.au/itm/142147289509?_trksid=p2060353.m1438.l2649&var=441218796542&ssPageName=STRK%3AMEBIDX%3AITniiiiiice thanks DTJregards Neil.
Cypress PSoC Creator + MiniProg3 + EZ-BLE - Page 1
Forum section: electronics / projects

author: joeqsmith
author_rank: Super Contributor
timestamp: May 10, 2025, 07:29:31 pm
content: Brymen is releasing a new DMM with BlueTooth and I have been attempting to learn a little more about it. The following is Dave's thread for this meterhttps://www.eevblog.com/forum/testgear/new-brymen-bluetooth-bm787bt-multimeter/The meter utilizes a Cypress (Infineon) CYBLE 212006-1 radio. I bought an evaluation board for this radio along a programmer. Details for these can be found here:https://www.infineon.com/cms/en/product/evaluation-boards/cyble-212006-eval/https://www.infineon.com/cms/en/product/evaluation-boards/cy8ckit-002/Looking at some of their documentation and videos, it seems fairly simple to setup. Their first video in the series makes a point of just how simple it is. Being the complete idiot I am, I can's seem to get off the starting line with it and wonder if anyone here has experience with it that could help.Cypress video series:https://www.youtube.com/playlist?list=PLIOkqhZiy83FM8mrUeyC4ESNMVkMQjj1rI downloaded and installed PSoC Creator 4.4. I then started a new project bases on the 212006-01. I used the schematic type. My schematic is nothing more than the BLE radio block. I setup a Custom profile using a GATT Server, with the GAP role set to Peripheral. OTA is turned off. Trying to start with something VERY basic. The the GAP settings, I just used the defaults. Discovery mode General, Advertising type Non-connectable, Fast advertising with timeouts disabled. I am using the BLE low power mode.It creates the project with no errors or warnings and it will build, also without errors or warnings. Creator locates the MiniProg3 programmer and allows me to program/debug the CYBLE-212006-EVAL board. The radio gets it's power from the MiniProg3, which keeps the power applied.The problem is I can't get the radio to advertise. Cypress does not offer any sort of demo projects for this evaluation board. I doubt the radio is defective and suspect it is something I am doing wrong.I am using my desktop PC with a USB BLE radio to test it. This is the same radio I used to communicate with the Brymen meter. That part all works fine. It just never finds this eval board. Searching their forums, their are other who have posted similar problems but I never seem to find what the cause is. If you can provide any help in sorting it out, it would be appreciated.

author: joeqsmith
author_rank: Super Contributor
timestamp: May 11, 2025, 01:05:34 am
content: After a lot of trial and error, I managed to get the PC and phone to see the evaluation board. For the PC, I am using Bluetooth LE Explorer. For the phone, I am using Infineon's AIROC. This program supports OTA programming, similar to what Brymen uses, but they are not compatible.
Cypress USB Hub Not working - Page 1
Forum section: electronics / projects

author: tim.vrakas
author_rank: Newbie
timestamp: October 19, 2015, 01:09:18 am
content: Hello, I just finished designing this USB hub, it is my first time working with USB, and I cannot get the hub to work correctly.When I plug in the device, the hub controller chip gets warm, (but I would not say hot). USB devices plugged into the hub power on, but do not connect to the computer. In device manager, I do not see the hub or the devices plugged in.I have only connected the USB-Hub related components, not any of the arduino stuff, the voltage regulator (for arduino) the GPS or the IMU.Here are the design files:https://github.com/Timvrakas/NASA-PCBsHere is the controller datasheet:https://drive.google.com/file/d/0B4ncak... sp=sharingAny ideas/ how to proceed from here?Thanks, Tim

author: kc8apf
author_rank: Regular Contributor
timestamp: October 19, 2015, 01:21:09 am
content: Is the 12MHz oscillator for the USB hub running?

author: tim.vrakas
author_rank: Newbie
timestamp: October 19, 2015, 01:33:11 am
content: OOooo! good question!! however my oscilloscope is at school. I will bring it home tomorrow and check.BTW, if any of you could not tell, this is not my profession (yet, anyways, I am in high school!). So leave no stone unturned with regards to "Obvious mistakes"ThanksTim
D flip flop latch  - Page 1
Forum section: electronics / projects

author: richcj10
author_rank: Unknown
timestamp: June 20, 2014, 06:45:14 am
content: I am making a safty system using hardware gates. I want it to be set up so that if the input of the input of the opamp falls below Voff, it would trigger the output and couldn't be reset with out power on reset. Is this right?

author: void_error
author_rank: Frequent Contributor
timestamp: June 20, 2014, 07:45:47 am
content: You could use a dedicated comparator (LM393 for example) instead of the opamp and a discrete (or using logic gates) RS flip-flop in place of the D type flip-flop.The power-on reset is going to be performed by a capacitor (don't forget to put a high value resistor in parallel with it) connected to one of the flip-flop's inputs, while the other input is connected to the LM393's output which is open-collector.Here's some info:http://en.wikipedia.org/wiki/Flip-flop_%28electronics%29A drawback of the logic gate RS flip-flops is that you have to avoid a certain input combination, but there's a circuit using the two remaining gates of the chip which eliminates the drawback.edit: Here's a circuit from a book from 1980. This should suit your application. Sorry about the quality, my phone's camera is not very good.
D-Link DCS-2132L Network Camera firmware - Page 1
Forum section: electronics / projects

author: Laughwvst
author_rank: Contributor
timestamp: January 31, 2022, 08:29:37 pm
content: Hi!I happened to get multiple of those little cameras in unopened boxes from my company, because they were making some space into the warehouse. The cameras have been shipped with our company specific firmware from D-link and therefore they could only be used in our proprietary video-surveillance system. This system has been taken down and now the cameras are pretty much useless, because they cannot communicate with the D-links normal software, but I am not software-guy enough to understand why exactly. I have downloaded the original firmware bin-file from D-link, put it onto a memory card and installed the firmware onto the camera. However, it still fails to show up in the D-link wizard and also I cannot connect to it directly using the IP-address, because the default password is not accepted.Does anyony have any clues, how could I get the camera flashed to its original firmware, because the firmwares seem to be open source on D-links website. My camera is the DCS-2132L HW Revision: B1.At least the memory cars update did not work, so is there any hope to get those up and running again? Maybe some D-link engineers here?- Ben

author: Laughwvst
author_rank: Contributor
timestamp: February 01, 2022, 02:36:20 pm
content: The camera seems to have Hi3518 IP-Cam SOC with additional DRAM and flash modules attached to it. Also a realtek wifi-module, so it really does look like only the software is the differing part to the commercially available cameras.I really hope someone could help me with getting it running the original firmware again.

author: Laughwvst
author_rank: Contributor
timestamp: February 01, 2022, 02:36:55 pm
content: Other side

author: Laughwvst
author_rank: Contributor
timestamp: February 01, 2022, 03:32:27 pm
content: Actually, when I think about it, I am able to install the original firmware onto the camera, by putting it onto a memory card in a folder called upgrade, because after this the camera acts differently. It is now able to turn on the IR led by itself. However, I am still not able to connect to it directly with the IP address, or with the installation wizards on windows or on android.

author: CJay
author_rank: Super Contributor
timestamp: February 01, 2022, 10:21:53 pm
content: Is there a factory reset you can perform, perhaps via one of the buttons?Can you attach a USB-TTL serial to the UART pads/holes omn the board and see what's going on?
d-pad and button contacts are covered in a dark gray textured material? - Page 1
Forum section: electronics / projects

author: grips03
author_rank: Contributor
timestamp: May 06, 2014, 04:05:35 pm
content: I'm making a pcb for a Nintendo gamepad controller and I noticed the pcb d-pad and button contacts are covered in a dark gray textured material. Is this important? I usually get PCBs from oshpark and they have enig finish.Thanks

author: mariush
author_rank: Super Contributor
timestamp: May 06, 2014, 04:48:32 pm
content: That's a conductive material, it makes the connection between the traces under the button. So yes, I'd say it's pretty important.

author: ovnr
author_rank: Frequent Contributor
timestamp: May 06, 2014, 05:08:21 pm
content: Actually, I think grips03 was referring to the coating of some random conductive carbon compound onto the PCB pads. This is sometimes done, probably to avoid having to spring for a proper ENIG coating... Also, it's also sometimes used as a "2nd layer".Example:http://s3.amazonaws.com/f01.justanswer.com/JACUSTOMERyw8dcbpf/2011-12-01_163917_photo_2.jpg(Edit: Just realized it might be to make it easier to wavesolder the board without gunking up the pads too. I don't know.)

author: grips03
author_rank: Contributor
timestamp: May 06, 2014, 05:19:31 pm
content: Quote from: ovnr on May 06, 2014, 05:08:21 pmI think your right about that method and wave soldering.I was able to find some info here as wellhttp://siliconeswitches.com/pcb.htmthanks for the reply
d401a pinout - Page 1
Forum section: electronics / projects

author: electronics technician
author_rank: Regular Contributor
timestamp: June 25, 2014, 05:27:24 pm
content: i need help getting the pinout of d401a its a to-220 packagei sent my father with a list of parts to buy at a local electronics store and he came back with the wrong transistorsi got 4-D401a i learned a valuable lesson dont send your dad to buy components for you D.I.Y.-do it yourself thanks for the help

author: nessatse
author_rank: Regular Contributor
timestamp: June 25, 2014, 05:42:54 pm
content: Somebody mentioned to me there is an awesome tool call google that you can just type stuff in and it finds all kinds of information for you. Maybe you can give it a go and report back?

author: electronics technician
author_rank: Regular Contributor
timestamp: June 25, 2014, 05:48:53 pm
content: i tried that! NOTHING

author: dannyf
author_rank: Super Contributor
timestamp: June 25, 2014, 07:13:58 pm
content: T220 transistors usually follow B-C-E / G-D-S orientation.

author: Niklas
author_rank: Frequent Contributor
timestamp: June 25, 2014, 07:16:29 pm
content: Add "2s" in front of the d401a (2sd401a) and you will get some relevant search hits.

author: electronics technician
author_rank: Regular Contributor
timestamp: June 25, 2014, 07:45:52 pm
content: Quote from: Niklas on June 25, 2014, 07:16:29 pmok imma try it thanksQuote from: dannyf on June 25, 2014, 07:13:58 pmok kool thanks for the info
D5FB20 - Page 1
Forum section: electronics / projects

author: alexo
author_rank: Contributor
timestamp: January 26, 2017, 02:13:05 am
content: Anything special about these bridge rectifiers ( D5FB20 )

author: Dave
author_rank: Super Contributor
timestamp: January 26, 2017, 09:08:35 pm
content: No.

author: Benta
author_rank: Super Contributor
timestamp: January 26, 2017, 09:35:25 pm
content: Apart from the very strange package: no.
D7210C based GPIB DIY, worth it? - Page 1
Forum section: electronics / projects

author: TaylorD93
author_rank: Regular Contributor
timestamp: October 06, 2025, 10:10:38 am
content: Hi Everyone,Like most people i want to control my TE via GPIB, but without relying on the NI/Keysight USB to GPIB adapters. Recently i was able to save a few processor cards from a late 90s Safety Tester, made by a brand called Sefelec (now owned by Eaton).The Processor cards have a daughter board (i have two of these) which holds a NEC D7210C as well as a 75161 and 75160 devices which acts as the GPIB interface from the processor card to the GPIB Port.Does anyone have experience using this IC? the datasheet shows an example circuit which seems similar to the daughter boards i have, but im not so sure about the required interface between the 7210C and a processor.I have to admit whether (as i dont know too much about the details of the GPIB bus), would there be any advantages to using these for a GPIB adapter, compared to just using the Arduino based 488 project shared on the forum?Thanks,

author: coromonadalix
author_rank: Super Contributor
timestamp: October 06, 2025, 06:20:44 pm
content: you have gpib projects here on eevblog usb lan interfaces, even some projects with wi-fi or esp32the d7210 is an interface controller, you will need some brain to go with it ...you have to search for projects involving this ic, personally never saw one with it ?

author: Swake
author_rank: Frequent Contributor
timestamp: October 06, 2025, 07:29:01 pm
content: Some time ago I acquired some older power supplies that did not have the optional GPIB & Serial interface installed. Of course those cards where not available any longer. These interfaces are often not much more than the chips you name on a PCB with a fancy connector to connect to the main board. As I wanted to remote control the power supplies the solution for me was to reverse engineer an original board and 'copy' it.I believe the best re-use for your chips is if you encounter a similar case and you have to rebuild some interfaces.
DAB converter With DPS modulation - Page 1
Forum section: electronics / projects

author: BurnedElectron
author_rank: Newbie
timestamp: June 09, 2024, 08:01:59 pm
content: I am developing a 1 kW prototype of a DAB converter with DPS modulation and a planar transformer. The DAB has a dual active bridge, with one side having a constant DC bus voltage of 200 V, while the other side varies between 10 V and 50 V. Currently, I am facing two problems:alpha1, which is the angle between the two H bridges, and alpha2, which is the angle between the arms of the H bridge.I am unsure which formula to use to calculate the transformer's auxiliary inductor as there are two formulas for calculating inductance. One for when alpha1 < alpha2 and another for alpha1 > alpha2.My control strategy involves drawing a power curve as a function of alpha1 and directly setting the angle based on the desired power to make the converter faster. Does anyone have advice on how to calculate alpha2 to minimise reactive power? I still don't have a strategy.
DAB Radio modules and Firmware... - Page 1
Forum section: electronics / projects

author: CJay
author_rank: Super Contributor
timestamp: April 11, 2017, 08:36:57 pm
content: Anyone know where to get hold of the Frontier Silicon Venice/Verona slave SERMMI firmware?I've got a few Verona modules here and would like to be able to control them via a serial link...Any hints appreciated.

author: chema.rb
author_rank: Contributor
timestamp: November 28, 2017, 04:12:36 pm
content: Which radios did you got the modules from? I am thinking about a project with a DAB receiver and Verona modules looks promising (if i manage to put my hands on the documentation).

author: CJay
author_rank: Super Contributor
timestamp: November 28, 2017, 07:43:46 pm
content: I got them out of John Lewis Aston DAB radios,I bought a batch of faulty ones and found they all had duff audio amps.Would be very interested to see documentation for them

author: chema.rb
author_rank: Contributor
timestamp: November 29, 2017, 12:00:17 pm
content: Same as me, but it seems Frontier Silicon is quite secretive about it's SDK... I might design a module based on the SI4685, it would take some time (and money) but the documentation is readily available.

author: ed_reardon
author_rank: Regular Contributor
timestamp: January 18, 2018, 10:07:25 pm
content: Sorry to drag this one up from the dead, but I too have salvaged one of these modules from a broken clock radio (got launched across the room one Sunday morning...) I'm working on a little receiver project and this module would be an ideal addition but I can find precious little about it online.Guess nobody has come across any documentation (or the SDK...)Sorry if that's a naughty question

author: Morus
author_rank: Newbie
timestamp: February 10, 2018, 12:00:33 pm
content: I could provide a firmware image of a Verona 1 module in master SERMMI mode at 19.2kbps and a description of the protocol if that is helpful. Master SERMMI means that the module handles the UI by itself and you only receive the display content and send keyboard scancodes via the uart interface.

author: CJay
author_rank: Super Contributor
timestamp: March 01, 2018, 09:16:02 pm
content: That firmware image would be very useful, but how to get it onto the modules I have?
DAC - Page 1
Forum section: electronics / projects

author: ranganatennakoon
author_rank: Contributor
timestamp: April 29, 2020, 04:26:07 pm
content: can we makeDACsine wave inverter?i think, if we can useDACfor making sine wave inverter it is batter thanspwm

author: coromonadalix
author_rank: Super Contributor
timestamp: April 29, 2020, 05:12:18 pm
content: For a pure sine wavelow thd, low jitter, precision ? up to witch frequency ?You can make sine wave by other means too ?A cheap way of doing it :http://www.learningaboutelectronics.com/Articles/Sine-wave-generator-circuit-with-a-555-timer.phpYou can make it with some mcu with added filteringThe list goes on and on

author: Prehistoricman
author_rank: Regular Contributor
timestamp: April 30, 2020, 12:17:14 am
content: SPWM is essentially a class D amplifier. High efficiency. Most DACs (thinking of audio output ICs) would use less efficient class A output drivers.Which is better completely depends on the application.

author: David Hess
author_rank: Super Contributor
timestamp: April 30, 2020, 03:48:48 am
content: You can but efficiency is limited to about 66% because of the linear output stage. A class-D amplifier can be 95% efficient or better.
DAC and Amplifer  - Page 1
Forum section: electronics / projects

author: cRash1001
author_rank: Contributor
timestamp: April 26, 2016, 02:46:29 pm
content: I am using a DAC PCM5102APWR whose output I am feeding to a TDA2050 amplifier. There is a lot of noise when i connect them directly. So, I am using a 1:1 Audio Isolator DA103MC in between them. The audio output is now with out noise but the sound quality is not good when i operate the system at high volume. I think the output is being clipped. I want the audio output to be less distorted. So, what should i do?I have designed my circuit according to the reference design in data sheet. The TDA2050 is powered by single supply of 12V.

author: Kevman
author_rank: Regular Contributor
timestamp: April 26, 2016, 03:42:38 pm
content: It wasn't distorting at high volume without the isolater? I'm not sure how that would affect output power unless the isolater is too small and rolling off the low frequencies. Is the problem that the low frequency response is reduced?You can try increasing the gain of the amplifier if the DAC is clipping. Might want to try a couple of different input sources to rule out the DAC.If the amplifier is clipping switch to a higher voltage power supply. With a 12v supply you aren't going to get that much power out of it. Try going to 24 or even more, but make sure your power decoupling caps are rated for the voltage.

author: Paul Price
author_rank: Super Contributor
timestamp: April 26, 2016, 03:47:55 pm
content: The digital transformer is of no use for audio signals, use a low-pass filter between the DAC and the amplifier instead to remove high-frequency noise.

author: cRash1001
author_rank: Contributor
timestamp: April 26, 2016, 04:28:50 pm
content: It was distorting at high volume without the isolater but not as much when i connected the isolator. I am using an audio transformer DA130MC it is supposed to only pass audio signals and isolate the digital and analog part to remove noise
DAC Controlled Power Supply - Page 1
Forum section: electronics / projects

author: maurosmartins
author_rank: Regular Contributor
timestamp: April 25, 2019, 02:33:35 pm
content: Hello all,I would like to mount a small power supply ideally capable of supplying up to 2A @12V and must be DAC controlled. I've mounted a linear power supply with a mosfet (I've already tried N and P channel) as series pass transistor and a ampop as the following schematic:I've calculated the voltage divider to match 12V at the maximum DAC output. It works ok (kinda). With no load voltage regulation works fine, I'm able to change the DAC and set the correct output voltage. as soon as I start to demand some current (as low as 10mA) the output immediately drops.Some measurements:Vout@no load = 12VVout@10mA = 11.93VVout@100mA = 11.48Vto my understanding the ampop should compensate this voltage drop but it doesn't. What am I doing wrong?Here is my current BOM:Ampop LM358NDAC MCP4725Pchannel mosfet FDD4141I also have a 100uF at the output that is not shown in the previous schematic.Both ampop and mosfet source are at 12V R1 = 2k and R2 = 1k.Thanks in advanced,Best regards, Mauro.

author: Kleinstein
author_rank: Super Contributor
timestamp: April 25, 2019, 02:59:20 pm
content: Both circuit have a chance to oscillate - not guarantied, but well possible with some loads.The P-Channel version may not be able to fully turn off the FET as the output range of the LM358 is limited. Depending on the FET is may just work. Chances for oscillation are high of there is not capacitor at the output.The N-Channel Version has quite some voltage drop. Some 2-3 V from the LM358 and some 3-5 V from the FET's gate source voltage.The noted FDD4141 is not suitable - it may well run too hot.

author: Andy Watson
author_rank: Super Contributor
timestamp: April 25, 2019, 04:08:32 pm
content: What is Vin voltage ?

author: maurosmartins
author_rank: Regular Contributor
timestamp: April 25, 2019, 04:28:32 pm
content: Hello Kleinstein, and Andy Watson, thank you for replying:@Kleinstein, The FDD4141 was the only P channel mosfetI had lying around I understand that it is not suitable for 2A loads. Also I do have a 100uF capacitor at the output.@Andy, Vin = 12VUpon further analysis it was not the circuit that had poor voltage regulation, it were the voltage drops due to poor wiring and bread-boarding. With thicker wires the results are now the following:Some measurements:Vout@no load = 12VVout@10mA = 12VVout@100mA = 12VVout@500mA = 11.91VI'm ok with this, I'll have to get a suitable mosfet but this is the starting point.Best regards, Mauro.

author: Kleinstein
author_rank: Super Contributor
timestamp: April 25, 2019, 04:39:44 pm
content: With Vin = 12 V a piece of wire is working better to get 12 V out.So the regulator may not even be active.

author: maurosmartins
author_rank: Regular Contributor
timestamp: April 25, 2019, 04:50:42 pm
content: you are right, it wasn't the best example but it is working also for other output voltagesBest regards, Mauro.
DAC Decoder popping and clicking on S/PDIF Coaxial and Optical - Page 1
Forum section: electronics / projects

author: stojke
author_rank: Regular Contributor
timestamp: January 04, 2020, 08:59:13 am
content: Hi. A friend brought in an custom job somebody did for him, an combination of an Chinese selector with volume, an power supply board and an Chinese DAC Board that has two S/PDIF inputs and one analogue audio output. The problem he is having is that when he uses Coaxial each time he changes the TV channel or song the DAC emits a *pop* sound and when using Optical when in idle state the DAC emits constant *clicking* sound, and the little signal diode constantly flickers (Active , signal is inputed = LED ON ; Not active , no signal is inputed = LED OFF). DAC uses CS8416 and PCM1794.Is there an diy type of DAC board that has automatic muting I can buy in order to replace this one, or, maybe, from experience what would be the cure for this one? (Defective CS8416?)Edit:On analogue audio inputs such things do not occur. Only on digital S/PDIF.The DAC Decoder board is like so : Coax/Optical > CS8416 > PCM1794 > OPAMP > Analog Switch (HEF4053BT) > Into Analog input of selector

author: stojke
author_rank: Regular Contributor
timestamp: January 08, 2020, 08:43:56 am
content: Any one? He really likes it.
DAC filter question - Page 1
Forum section: electronics / projects

author: Karamel
author_rank: Regular Contributor
timestamp: June 22, 2015, 08:53:32 pm
content: Hi Everyone,I would like to ask one question about DAC sound filter to you. I would make a wav player with stm32f407 discovery board and I didn't decide what kind of filter which I must use. Bellow, there is a filter. Is it good for DAC of STM32 to amplifier?Best Regards,Karamel

author: lewis
author_rank: Frequent Contributor
timestamp: June 22, 2015, 09:07:29 pm
content: You'd usually use a sallen-key filter on the output of an audio DAC, it's a good idea to use an op-amp to provide some buffering of the DAC's output.More info here:http://sound.westhost.com/articles/active-filters.htmhttps://www.google.co.uk/search?q=low+pass+sallen+key+filter&tbm=isch

author: Karamel
author_rank: Regular Contributor
timestamp: June 23, 2015, 10:31:48 am
content: Hi,Thanks for replyingUnfortunetely, I have no enough area on pcb to use opampcan't i make it like my schematic?

author: rs20
author_rank: Super Contributor
timestamp: June 23, 2015, 11:06:15 am
content: Are you using the CS43L22 DAC chip on the discovery board, or a DAC on the STM32 chip itself (I'm not familiar with STM32, does it have a DAC on the chip itself?). The discovery board already has a 3.5mm plug on board connected to the CS43L22, why not just use that?Quote from: Karamel on June 23, 2015, 10:31:48 amThe correct question to ask is "what are the consequences of not using an op-amp?" If we know which DAC you're using, and the input impedance of your amplifier, we can answer that question. If you're using the CS43L22 DAC, you'll see the designers decided an opamp was not necessary (see page 38 here*), because the CS43L22 has a good, strong buffered output** and so doesn't need a separate op amp.*http://www.st.com/st-web-ui/static/active/cn/resource/technical/document/user_manual/DM00039084.pdf**http://www.cirrus.com/en/pubs/proDatasheet/CS43L22_F2.pdf