hybridfree/eevblog-posts huggingface dataset:
Video Camera Modification - Page 1
Forum section: electronics / projects

author: Mike Warren
author_rank: Unknown
timestamp: December 06, 2013, 03:52:33 am
content: Here's a project I just finished for fun.I have a small consumer camera I wanted to improve some things on.-Better audio with manual control.-Use common Sony NPF-550 batteries.-Quick release tripod mount.-Ability to fit my 67mm filters.-Lens hood to reduce flare.-Shade over the LCD to help visibility in bright light.Most of the time went into the mechanical side of the project. Made from plastic enclosures and fibreglass.Schematics, Gerbers, Code here:http://mike-warren.net/files/SD90Mod-rev1.zip

author: SeanB
author_rank: Super Contributor
timestamp: December 06, 2013, 04:33:59 am
content: Very nice conversion. Nice work there.

author: Legit-Design
author_rank: Frequent Contributor
timestamp: December 06, 2013, 06:56:43 am
content: Did you make any changes to the audio input circuitry on the actual camera? I assume is was just normal condenser mics. Did you just tap your mod into the existing circuitry? I've been planning to add external mic input for my camera, but was thinking more of a quick hack, than something this advanced.

author: hedgewallace
author_rank: Contributor
timestamp: December 06, 2013, 08:05:37 am
content: How does the microphone go compared to the in built one?

author: Mike Warren
author_rank: Unknown
timestamp: December 06, 2013, 07:59:36 pm
content: Quote from: Legit-Design on December 06, 2013, 06:56:43 amNo. The camera has a 3.5mm audio input jack. I added a couple of condenser mics in a stereo configuration and preamp. I have lowered the camera's audio levels by 9 dB, which lowers the noise floor. My preamp is quieter than the camera's.The external mic is a desk shotgun that I modified.

author: robrenz
author_rank: Super Contributor
timestamp: December 06, 2013, 08:23:00 pm
content: Very nicely done Mike!
Video card - some die pictures - Page 1
Forum section: electronics / projects

author: Noopy
author_rank: Super Contributor
timestamp: July 28, 2019, 08:15:34 pm
content: Hi all,recently I studied some video cards.Perhaps you are interested in the pictures:Text is german as usual:https://www.richis-lab.de/GraKa.htmHave fun!Best regards,Richard
Video converter, parallel RGB to MIPI. - Page 1
Forum section: electronics / projects

author: luiHS
author_rank: Frequent Contributor
timestamp: July 07, 2021, 07:45:27 pm
content: HiHas anyone built an RGB parallel to MIPI video converter, any recommendation of a chip for this task?I have in design a video player using a microcontroller. At first I was going to use an H7 from ST, but due to the shortage of components, it is totally sold out, although in the end I got 100 pieces in LQFP208, for certain designs I need BGA for the available space.So, I'm thinking of using an RT1064 micro that I have in quantity with BGA package and it has parallel RGB video output, but I would need to convert that output to MIPI to be able to use some screens.I was looking for chips that convert from RGB to MIPI and I only found one from Toshiba in BGA format, with a somewhat fine pitch (0.65), but with few balls and most of them in two rows. I think I could give it a try, unless there is another chip that I don't know about and that is easier to solder (a 0.8mm pitch BGA or an LQFP).

author: Boscoe
author_rank: Frequent Contributor
timestamp: July 08, 2021, 12:37:09 pm
content: I’m not sure but I think Lattice semiconductor has IP available for their FPGAs, does mean another programmable device though.

author: Berni
author_rank: Super Contributor
timestamp: July 08, 2021, 12:55:42 pm
content: The issue is that MIPI is designed to be used in mobile devices. So chips that work with MIPI tend to come in tiny BGA packages so that they fit into phones and smartwatches and whatnot.As Boscoe said, FPGAs can be used to convert to/from MIPI. Lattice has some with IO specifically designed for MIPI levels, such as the MachXO2 family, or the family specifically for video processing. It tends to be a pretty costly solution, but they are available to buy and can get them in pretty friendly packages.
Video: Current Limiting for a Linear Power Supply - Page 1
Forum section: electronics / projects

author: rsduhamel
author_rank: Contributor
timestamp: December 22, 2017, 08:34:55 pm
content: I just posted my latest video on my linear power supply project. In it I spend a few minutes talking about the basics of current limiting.https://youtu.be/soygy1rnLcsThis video series is not about how to build the best power supply. It is about learning how components work together to make a useful circuit. When finished I will have built, and explained in detail, a primitive but useful bench power supply. If it is more appropriate to post in the beginners section, please let me know. Thanks.
VIDEO DOOR INTERCOM CIRCUIT DIAGRAM - Page 1
Forum section: electronics / projects

author: kene
author_rank: Newbie
timestamp: February 13, 2014, 12:18:40 am
content: PLEASE DOES ANYONE HAVE THIS CIRCUIT OR HAVE IDEAS ON HOW TO BUILD IT?

author: Unknown
author_rank: Unknown
timestamp: February 13, 2014, 01:13:13 am
content: Yes.

author: dr.diesel
author_rank: Super Contributor
timestamp: February 13, 2014, 01:16:09 am
content: Thought you were busy building a keyless remote?

author: c4757p
author_rank: Super Contributor
timestamp: February 13, 2014, 01:39:33 am
content: What have you tried so far?And please use your indoor voice. People are likely to be annoyed by the CAPITALIZATION!
Video Format Conversion - Page 1
Forum section: electronics / projects

author: Mike Warren
author_rank: Unknown
timestamp: October 31, 2018, 11:50:53 pm
content: I have been asked if it's practical to convert an odd (to me) frequency analog video signal into PAL or NTSC.I don't know what the source signal is called. Looking at it on the scope I see it has a vertical frequency of 30Hz and a horizontal frequency of 33.8kHz. Other than that it looks much like a typical NTSC signal with colour burst etc. Although the colour burst seems to be much higher than 3.57MHz. More like 25MHz.I'm guessing the only way to do it would be digitally. That's certainly much too large a job for me, but I had a thought that possibly the source signal is a known standard and there might be an off the shelf chip that will convert it.Does anyone have any information to help me?
Video: how to measure the velocity factor and impedance of unknown coax - Page 1
Forum section: electronics / projects

author: w2aew
author_rank: Super Contributor
timestamp: July 27, 2014, 08:09:51 pm
content: I picked up a nice chunk of high-temperature coax cable this weekend, and wanted to determine the impedance and velocity factor of it. Here's a video of how I did it. *Please* pardon the boneheaddecimal point slip in the metric conversionEnjoy!

author: GreyWoolfe
author_rank: Unknown
timestamp: July 27, 2014, 08:59:17 pm
content: Awesome educational video, Alan. Yet another in a long line of great content videos.Tom, NW0LF

author: AlfBaz
author_rank: Super Contributor
timestamp: July 27, 2014, 11:49:34 pm
content: Are you stalking me?The number of times your video's coincide with something I need to know or do is incredible. Thank you heaps for your time, creating these

author: rob77
author_rank: Super Contributor
timestamp: July 28, 2014, 12:01:08 am
content: excellent video !keep going !

author: w2aew
author_rank: Super Contributor
timestamp: July 28, 2014, 02:06:58 am
content: Quote from: AlfBaz on July 27, 2014, 11:49:34 pmLOL! Let me know next time you have a need to know something - maybe I'll already have a video queued up!

author: w2aew
author_rank: Super Contributor
timestamp: July 28, 2014, 02:41:48 am
content: Quote from: wilfred on July 28, 2014, 02:34:47 amYes, of course it is. I've already added "annotations" to the video to correct my error in the metric units. Bonehead error - sorry about that

author: rob77
author_rank: Super Contributor
timestamp: July 28, 2014, 06:39:47 am
content: Quote from: w2aew on July 28, 2014, 02:41:48 amtake it easyit might happen to anyone who is not used to metricthe most important and interesting part is sharing your knowledge. hats off to you for that !
Video input converters. PAL/NTSC to MIPI CSI-2 - Page 1
Forum section: electronics / projects

author: Tinkerlad
author_rank: Newbie
timestamp: March 01, 2019, 01:55:08 am
content: Hi guys,Got a quick question regarding IC selection. I am trying to add analogue video input to a raspberry pi like device for a project I am working on.This device has a standard pi header, as well as the CSI input.My analog video can be either NTSC or PAL.My intent originally was to get a one chip solution to convert from PAL/NTSC to MIPI CSI. I found the ADV7280-M. This chip is perfect in all aspects bar one.... It costs AUD$14.66 in single quantity.....The other thing with this chip is that it offers 8 analog inputs to switch between.... This is something I dont really need.....I had considered using something like a TVP5150AM1 then a FPGA to translate the parallel 8-bit ITU-R BT.656 format into CSI. but am still new to this field and would have to spend a very long time working this out....So my question is, has someone done something like this before and/or can recommend a cheaper option? I am open to using either CSI or another input method. I am also not objecting to using intermediary formats and multiple ICs.Thanks, and I welcome your guys thoughts.

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 01, 2019, 03:16:55 am
content: How about a USB video capture gadget?

author: Tinkerlad
author_rank: Newbie
timestamp: March 01, 2019, 04:35:10 am
content: Quote from: NiHaoMike on March 01, 2019, 03:16:55 amThe problem I have with that is that the bandwidth is incredibly low... USB2.0 gives a theoretical maximum of 480Mb/s while CSI has a theoretical of 1Gb/s (realistically achieving ~800Mb/s) per lane. The device like the pi has two lanes available.For PAL/NTSC at an 8bit resolution the video bandwidth alone is ~310Mb/sAt 10bits/pixel this goes to ~370Mb/sAs the device muxes all of the usb ports to a single port on the SoC this would limit me to 1 video stream maximum assuming nothing else is hogging usb bandwidth. This same problem arises on the Pi. This is shy I would like to use the CSI header....

author: Cezane
author_rank: Newbie
timestamp: May 02, 2022, 07:54:44 pm
content: I'm also interested in the exact same solution. Did you find any other solution for video analog to CSI? or other IC than ADV7280-M?
Video - Microwave Gunn diodes and Gunn diode oscillators - Page 1
Forum section: electronics / projects

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: April 06, 2015, 05:26:52 pm
content: Hi.I made another video - this time I talk about Microwave Gunn diodes, Gunn diode oscillators and show some experiments that I have done with them. This time is less "mumbling". Please enjoy. All feedback is welcome!
Video of a Rigol 1052E being firmware altered to run Pong video game. - Page 1
Forum section: electronics / projects

author: Lawsen
author_rank: Frequent Contributor
timestamp: December 31, 2011, 09:08:36 pm
content: I am not sure, I should do this to my Rigol 1052E. It is a good display topic here.http://rigol.codenaschen.dehttp://codenashen.deby Andreas Schuler.

author: IanB
author_rank: Super Contributor
timestamp: December 31, 2011, 09:20:07 pm
content: Looks like you missed the boat. You might want to head over to this thread and continue there:https://www.eevblog.com/forum/index.php?topic=6113.msg79830#msg79830

author: victagayun
author_rank: Newbie
timestamp: December 14, 2019, 04:33:46 am
content: Old topic but clicking the link says"The topic or board you are looking for appears to be either missing or off limits to you."

author: coromonadalix
author_rank: Super Contributor
timestamp: December 14, 2019, 05:59:32 am
content: Same hereBut nice hack loll
Video signal ground isolation - Page 1
Forum section: electronics / projects

author: Leopoldo
author_rank: Contributor
timestamp: November 17, 2014, 09:05:44 pm
content: Hi to everyone,I'm new to the blog but I wanted to know if someone could help me:I'm working on composite video signal and trying to extract the vertical and horizontal components through an LM1881,but I got stuck in a problem: when I connect the ground of my power supply to the ground of the DVD player which I'm using as the signal source,the two grounds,being connected to the wall outlet,are completely different and I measured that they're about 120Vpp apart. So my question is: is there a way to take the signal from the DVD player with its ground and use it isolated in another circuit with another ground reference? So I don't get sparks... THANKS a LOT!!!

author: David_AVD
author_rank: Super Contributor
timestamp: November 17, 2014, 09:54:14 pm
content: The DVD player will be double insulated and the voltage you're seeing is via the small capacitors going from L & N to the DVD chassis.It is annoying and you may get a tingle, but this very low current leakage is completely normal.

author: Leopoldo
author_rank: Contributor
timestamp: November 18, 2014, 01:21:39 pm
content: So you say that if I connect the two grounds together I don't do any damage to any circuit? Because I agree with you,I took apart a tv and didn't find any isolation transformer or whatever on the composite video signal input... If it's so,it's perfect! Thank you very much!

author: David_AVD
author_rank: Super Contributor
timestamp: November 18, 2014, 10:02:01 pm
content: Most domestic AV gear these days only share a common ground via the signal leads. You'll be fine.
Video Signals for Newbies: CSYNC - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: December 19, 2022, 06:32:08 pm
content: I'm trying to build a simple test pattern generator using a rpi 2040 (aka pico) and using the scanline functions have managed to get seperate HSYNC and VSYNC working at my desired 15.6kHz scan rate... visible area is 256x224Now I need to move on to making Combined Sync (since this is what one of my monitors supports)...Looking at several arcade schematics I see nHSYNC AND nVSYNC used for nCMPSYNCI could do this... but then I saw a video where the HSYNC was present during the VSYNC period but inverted?Please could you point me at something that defines what composite sync should look like!Thanks in advance

author: Brianf
author_rank: Regular Contributor
timestamp: December 19, 2022, 07:26:09 pm
content: Here you go. (assuming that you want PAL).If you need NTSC, just shout.

author: Terry Bites
author_rank: Super Contributor
timestamp: December 19, 2022, 07:47:11 pm
content: See hackaday.io/project/161006-yet-another-vga-to-scart-adapter/details

author: wasedadoc
author_rank: Super Contributor
timestamp: December 19, 2022, 08:47:16 pm
content: It is impossible to make PAL or NTSC spec composite sync from the two HSync and VSync signals you already have. Full spec requires equalising and broad pulses which are at twice line rate.Having said that, most TVs and TV monitors will function adequately when given an AND of negative going HSync and VSync.

author: strawberry
author_rank: Super Contributor
timestamp: December 19, 2022, 09:46:35 pm
content: or maybe SECAM

author: Benta
author_rank: Super Contributor
timestamp: December 19, 2022, 10:32:26 pm
content: If you have 40 Euro to burn,Keith Jack, "Video Demystified" is the way to go. One of the best books in my library.
Video - teardown of VirtualInk interactive whiteboard, piezoelectric transducers - Page 1
Forum section: electronics / projects

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: April 12, 2015, 04:32:02 am
content: Hi,I have made another video today where I tear down VirtualInk interactive whiteboard system and I talk about some of the interesting piezoelectric transducers that I found inside.Please enjoy. Comments as always are welcome.
Video Tutorial, Analysis, Design of a flyback Part 8, Setting the Control Loop - Page 1
Forum section: electronics / projects

author: rbola35618
author_rank: Frequent Contributor
timestamp: October 10, 2013, 06:43:02 am
content: In this video, I show how to close the loop by making a small signal model in SPICE and I give a set of rules that make closing the loop easy. I also show how to use a Frequency Response Analyzer to measure the power stage (output filter), the error amp and then measure the overall loop response. Request for TopSPICE models that I use can be sent to my email of rbola35618@aol.com
Video Tutorial, Analysis of a flyback; Part 11, Common Mode Noise - Page 1
Forum section: electronics / projects

author: rbola35618
author_rank: Frequent Contributor
timestamp: April 06, 2015, 12:44:38 am
content: To EEVBLOGGER,In this video, I discuss what Common Mode Noise is and how it is generated. Common Noise is typically a leakage of current to earth ground. I show how the primary MOSFET in a flyback or any switch mode power supply, forms a capacitor which contribute to the generation of Common Mode Noise. Questions and comments can be sent to rbola35618@aol.comRobert Bolanos
Video Tutorial on the Design & Implementation of an FPGA RGB LED Matrix Driver - Page 1
Forum section: electronics / projects

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 01, 2015, 05:40:26 pm
content: In this episode Shahriar and Timo demonstrate the design methodology of an FPGA based 32×32 RGB LED matrix driver. Timo has kindly devoted some of his time to describe the block diagram and the thought process which goes into designing this type of FPGA display driver. The various components of the overall system (PLL, UART, and Display Controller) are shown along with the simulation data. The outputs of the Spartan-6 FPGA board are then measured using a Keysight S-Series oscilloscope. The design of the RGB matrix is also demonstrated using a custom clock interface sent wirelessly to the unit via Bluetooth.Watch the video here: [36 Minutes]youtu.be/h6NH_3KpWe8More videos at The Signal Path:http://www.TheSignalPath.com

author: marshallh
author_rank: Unknown
timestamp: September 01, 2015, 09:33:32 pm
content: As always a high level of quality.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 02, 2015, 03:07:46 pm
content: Quote from: marshallh on September 01, 2015, 09:33:32 pmThanks. I am putting together the VHDL code and will post it here later.
Video Tutorial on Waveform Shaping and Signal Constellation in an Optical Link - Page 1
Forum section: electronics / projects

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 04, 2012, 02:41:34 am
content: In this episode Shahriar uses a few components to beyond what there were originally intended for in order to setup an optical link! By using a BlinkM RGB LED, a Color Sensor, and two PIC USB Boards from Sparkfun Electronics, a stand-alone optical link is established. Various theories of operation, including multilevel data transmission, signal constellation and detailed circuit diagrams are also presented. The final result is an 8-PAM, 3-Wavelength optical link with a colorful three-dimensional constellation graph. The code for the transmitter IC, receiver IC and Matlab functions are available to download fromhttp://www.TheSignalPath.comhttp://thesignalpath.com/blogs/2012/06/04/tutorial-on-waveform-shaping-and-signal-constellation-in-an-optical-link/The Signal Pathhttp://www.TheSignalPath.com

author: FenderBender
author_rank: Super Contributor
timestamp: June 04, 2012, 03:43:52 am
content: Just watched this. You are a really good teacher. Please make more videos if you have the time!

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 04, 2012, 04:13:53 am
content: Thank you, I will. There are other videos on the site as well in case this is your first visit.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: June 04, 2012, 01:20:36 pm
content: The link to the experiment files has been fixed. Thank you for bringing this to my attention.
Video, UART and DC Power Using Only One Coaxial Cable - Page 1
Forum section: electronics / projects

author: nikkoderic
author_rank: Contributor
timestamp: February 01, 2015, 10:45:47 am
content: Good day eevblog community!I'm just an ECE undergraduate and only knows basic electronics so please bear with me. I just want to ask how to transmit NTSC composite video, serial data and 12v dc power (enough to power max of 10 "very" bright LED lights, an analog ntsc composite output camera, and a small dc motor) through a single 300m coaxial cable. Is it even possible? I just want some ideas from you guys and how to approach this problem generally. Not necessarily exact circuits etc.And I'm sorry for my english. XDThank you! =)

author: Psi
author_rank: Super Contributor
timestamp: February 01, 2015, 11:41:19 am
content: You could have a 12V DC offset on the composite video signal.You could also embed some serial data in the unused lines of the composite video signal (kind of like how teletext works)

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 01, 2015, 11:43:54 am
content: 300m is quite a long run to deliver 12V, surely 24V or more would be desirable? (If your loads are 12V, you'll need a converter.)What bitrate of UART? Bidirectional?Tim

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 01, 2015, 12:03:26 pm
content: The closed-circuit TV industry has been doing this sort of stuff for decades - you should be able to find info on how it's typically done.Chances are power is 24 or 48V.Google "power over coax" for a start
Video: Using RTL-SDR to receive APT weather satellite imagery - Page 1
Forum section: electronics / projects

author: Aaron D. Parks
author_rank: Contributor
timestamp: March 11, 2015, 04:32:13 pm
content: I put together a video showing how I got SDR#, WXtoImg, and Orbitron to play nice together and receive APT weather satellite imagery automagically using one of those RTL SDR dongles and a quadrifilar helix antenna.I was really happy with the image quality, even though the antenna is in the attic (hey, it's cold here). I had previously tried using a police scanner to receive the signal from these satellites, but the narrow bandwidth made for very poor image quality. No such problem with SDR, just type in the bandwidth and go.I'll bet a lot of folks here have one of these dongles and the parts to build an antenna. And hey, the weekend is coming up!I hope you enjoy it.
Video zoom using digital/hardware ... need advice - Page 1
Forum section: electronics / projects

author: Tracker
author_rank: Regular Contributor
timestamp: July 29, 2019, 01:52:06 pm
content: Hi folks,I have a project in mind which needs realtime video zoom (or call it crop) up to about x 2 zoom.The video signal is a standard securitity camera, 700 lines, black and white image.I was hoping there might be an off-the-shelf IC or PCB which could manage it?Any ideas?thanks
Viewing an LC circuit on a VNA - Page 1
Forum section: electronics / projects

author: GonzoTheGreat
author_rank: Regular Contributor
timestamp: January 30, 2019, 09:39:37 pm
content: I got to use a 2-port Vector Network Analyzer in my school for the first time.I can make S11, S22, S12 and S21 magnitude measurements as well as Impedance and Admittance on S11, S22, S12 and S21 at different frequencies.I calibrated the VNA and connected an air cored coil to Port1 and tried some S11 measurements.I am puzzled at the myriad of peaks and dips that I am seeing.1) Which one of them is the LC resonance ?2) At what frequency the most MMF is generated inside the coil ( magnetomotive force, ampturns) ? ( someone told me that if the RF current flows in the inter-turn self-capacitance (or in any other parallel capacitance) then it does not flow in the coil's windings and does NOT contribute to the MMF inside the coil )I am well aware that only ideal coils are composed solely of inductance and that real world coils also have self-capacitance. This capacitance forms a small LC circuit and that combined with the resistance of the wire forms an LCR circuit.The diagram below shows that the reactance of the inductance increases with frequency and the reactance of the capacitance decreases with frequency.3) Does that mean that as the frequency increases, less and less current flows in the inductance and more and more current flows in a capacitance ?

author: timpattinson
author_rank: Contributor
timestamp: January 30, 2019, 10:35:22 pm
content: Did you mean to attach a plot from the VNA?Sent from my SM-G930F using Tapatalk

author: Bud
author_rank: Super Contributor
timestamp: January 30, 2019, 11:22:24 pm
content: If you can also attach a photo of your setup showing connections of the circuit to the VNA we could provide more advice.Edit: .....as well as what VNA you using.

author: ezalys
author_rank: Frequent Contributor
timestamp: January 31, 2019, 05:20:55 pm
content: You're seeing the many modes of your circuit. It's true that the inductor will have some parasitic capacitance, and this paralleled with the measured inductance of the coil yields a tank circuit at some frequency, and it is at this frequency that the first resonance may present itself on the VNA as a dip. The issue is that there will be many higher modes of this circuit. The actual circuit model of a passive one-port is an infinite series of parallel LC resonators.
views on a battery - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: August 05, 2020, 06:13:42 pm
content: Has anyone tried one of these?:https://www.ebay.co.uk/itm/Lithium-48V-36AH-Ebike-battery-pack-100w-hgh-power-charger-new/353136397671,looks too cheap for the ah,what do people think of it,just be good to get folks thoughts on it.

author: Pawelr98
author_rank: Regular Contributor
timestamp: August 05, 2020, 11:02:22 pm
content: 13S3P3 parallel cells for 36Ah means 12Ah/cell.Best 18650 cells on the market are at or under 4Ah.So this offer is BS.But with such money it's possible to make such a battery using DIY methods.Good cells alone would cost close to 100 pounds.Then the rest.I would say building your own spot welder and making the battery yourself is still cheaper than buying from any legit offer.Myself I made 11S6P battery using LG MG1 cells. 200PLN for cells, ~150PLN spot welder, ~50PLN rest (plastic frame, metal strips for the battery).
Viking card-edge connector part number schema (crazy vintage) - Page 1
Forum section: electronics / projects

author: Cthulhoid
author_rank: Contributor
timestamp: June 22, 2018, 12:18:02 am
content: I was trying to find HP part number 1251-2314, a 2x10 0.1" female card-edge connector, for my (possibly in(s)ane) attempt to add a USB port to a 5300A/5304A frequency counter. This part is equivalent to Viking 2VH10/1JV5(079). I wasn't able to find a Viking catalogue online and haven't been able to get to a good university library yet to search in person, but based on all the sites spamming Google with a US DOD logistics databse, I could identify the individual components—2 VH 10/1 JV 5 (079).So 2 rows, vertical, through-hole?, 10 positions. Maybe "1" is 0.1 inch. Does anyone know what the other numbers signify? I ended up ordering a Sullins EBC10DCWN, which was a perfect fit (although obviously doesn't latch into the receptacle surrounding the male connector on the mainframe).
Vineyard LORAWAN project - power requirements - Page 1
Forum section: electronics / projects

author: bigal59
author_rank: Newbie
timestamp: April 02, 2021, 09:38:51 am
content: Hi everyoneWould appreciate some advice/guidance on components to power our system. We have installed 60 "Class C" lorawan irrigation controllers across a 500 acre vineyard. The controllers are awake 24 hours a day waiting for commands to control the irrigation system. They draw 50ma continuously - therefore 1.2ah day. We have 40w 12v solar panels installed at each controller location. We have had power supply issues and I want to go back to the drawing board and check we have the best spec'd power delivery for our application. I would like some advice on the following:1. Type and size of 12V battery people would recommend for outdoor use in hot/cold climate (-4 deg through to 50 deg). Probably require 3 days usable capacity for periods of little/no sunshine.2. Type and recommendation for charging regulator. Again needs to be outdoor suitable.The regulator and battery will be housed in an open sided galvanised box under the solar panel and therefore mostly shaded and rain protected.Thanks in advance for any input.regardsAlan

author: globoy
author_rank: Frequent Contributor
timestamp: April 02, 2021, 06:40:07 pm
content: Hey Alan,I made a solar charger meant for systems like yours. But even if you're not interested in my charger, you could read the user manual attached below and look in the Appendix B: "Calculating required charge power". It takes you through a set of calculations designed to help size your panel and battery.https://www.tindie.com/products/globoy/mppt-solar-charger-for-intelligent-devices/Regards and good luck, Dan

author: Boscoe
author_rank: Frequent Contributor
timestamp: April 02, 2021, 07:21:02 pm
content: Is your answer built into your question? Why are they awake 24 hours a day? I design an LoRa based star sensor network where the sensors were the communication masters. They would wake every n minutes (based on configuration) and will connect to the always powered hub (network slave) to see if there were any commands to receive. The system used 100mA on 3.6V cells at full power however using this method we got the battery life to almost the life of the cells themselves at >10 years.

author: bigal59
author_rank: Newbie
timestamp: April 02, 2021, 08:49:11 pm
content: We made the design decision to utilise Lorawan and class C due to security and wanting to follow existing standards. I can certainly see how your idea would be useful but we are too far down the path on this s implementation now.Thanks for your ideas. If you have any more details available to read I would be very interested.

author: bigal59
author_rank: Newbie
timestamp: April 02, 2021, 08:50:18 pm
content: Thanks Dan I'll check them out.
Vintage Bell Canada\ Northern Electric ICs QGA6A, QGA2B - Page 1
Forum section: electronics / projects

author: KJ-90
author_rank: Contributor
timestamp: March 09, 2017, 01:41:52 am
content: I recently found some vintage ICs that I think were made by Bell Canada or Northern Electric, since they have what appear to be Northern Electric part prefixes on them. The ICs are marked QGA6A, QGA2B. They all have a gold plated top and bottom, and a white ceramic substrate in between. I know QG is a Northern Electric prefix of some kind, but I'm not sure what it designates. I am wondering if these devices had Western Electric equivalents or part codes, since there were close ties between Northern and Western Electric. However, a family of old Western Electric IC data books I have from the late 1970s doesn't list any devices with a QG prefix.Any ideas on what these devices are?This would be probably a good time to ask, should we have a new board for people to ask about obscure and unknown semiconductors?

author: amyk
author_rank: Super Contributor
timestamp: March 09, 2017, 12:43:02 pm
content: CERDIP, but how many pins?Some pictures would be good too.
Vintage core memory module test/demonstrator stand - Page 1
Forum section: electronics / projects

author: Night_Gryphon
author_rank: Newbie
timestamp: December 25, 2020, 11:09:29 am
content: Dear AllI have an old times soviet core memory module and think of making demo/test stand to show it working. I think of this project as both art and electronics. I personally have skills in programming including STM32, Arduino, ESP8266 but very basic skills in electronics development so i will appreciate any help and ideas on this project[ Specified attachment is not available ]RegardsNight Gryphon

author: intabits
author_rank: Frequent Contributor
timestamp: December 26, 2020, 03:27:42 am
content: One day, I'd like to do the same with this IBM SMS card, type DJB.It's from a 2821 unit record controller (for printers, card readers and punches)No electronics, just the cores. But I also have the other cards that interfaced with it.Good luck with your project, I look forward to seeing your progress with this!

author: CaptDon
author_rank: Super Contributor
timestamp: December 26, 2020, 10:31:43 pm
content: The seeburg jukeboxes used a toroid core memory!!! The toroidshad a row wire and a column wire and you needed a write pulseon both to magnetize the toroid. There was one single read sensewire that ran through all of them in series and an individual readoutpulse wire for each toroid that was pulsed in sequence by a slidingcontact attached to the moving turntable that played the record.Seeburg called the unit a TorMat Memory and it could be read outeven years after a write in!!! There was a cute work around to playevery record on the juke box. You would pull the read sense plugout an 'spark' it with a D cell and that would magnetize every toroidto the 'selected' state.

author: tryode
author_rank: Newbie
timestamp: December 31, 2020, 02:21:31 am
content: @Night_Gryphon something similar was used in S1-98 soviet scope (in its case some vectors were stored into in order to show on the screen voltage and time numerical values). Maybe you can dig in that osc. service manual and understand a little bit how that memory array was operated.
Vintage DRAM Cameras (Cromemco Cyclops) - Page 1
Forum section: electronics / projects

author: bsudbrink
author_rank: Frequent Contributor
timestamp: November 10, 2017, 07:41:07 pm
content: Hi All,This is a project I've been working on, on and off, for a couple of years and I'm getting pretty close to completion. I thought others around here might be interested. I'm no good at videos, but I've made a web page with pictures and some descriptions:http://wsudbrink.dyndns.org:8080/cyclops/index.htmlI'd love to "talk" about it, especially if anyone here actually still has one or made one "back in the day".Bill Sudbrink

author: danadak
author_rank: Super Contributor
timestamp: November 10, 2017, 11:48:48 pm
content: I did not realize Cromemco made all the stuff shown in thecatalog. I bought a desktop PC when they first came out,basically just used it for office work. Worked good as longas the floppys disks were quality.Was not aware of the camera product, interesting. Makes onewonder if there is a yahoo group or other online group stillkeeping the "memories alive". I think I have some 1103 DRAMssomewhere, the first DRAM. Very difficult part to work with,from a timing point of view. User unfriendly. I also have longserial PMOS shift registers used for volatile memory. I wasa production engineer for a 256K bit serial PMOS shift registerfor government. Should have kept a couple of those...Regards, Dana.
vintage oscilloscope from radiometer about 1943 - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 21, 2025, 08:05:08 am
content: i think this OSG32 one is one of their oldest , Mine looks like a very erly model,i spend quite some time to get it up and running,i also had to go visit rediometer seek tru their old manuals, scann and share,it was quite cool to see the manual was burned from ww2 fire,so thanks a lot for all the support,

author: BILLPOD
author_rank: Frequent Contributor
timestamp: August 22, 2025, 01:37:06 pm
content: Thank you, Tom, for letting us see the insides of yet another fascinating piece of ancient test equipment. And your knowledgeable dissertation is appreciated. That is one awesome old scope. I wonder what the purpose of the red paint on some of the tubes. I only watched the first 8 min of the video, but will definitely finish it later. GOOD JOB!!

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 22, 2025, 10:01:36 pm
content: Thanks for your comment, at first i had the idea the old philips tubes red paint was just for looks,but some experts say it is shielding for noise,I just dont understand how it would workhere is what i get when AI searching the internetThe red paint on old Philips radio tubes, applied to the outside of the glass, was primarily used to hide the internal appearance of the valve, especially after the azide process, and to provide a more aesthetically pleasing or "classy" look to the radio's components. The azide process, used by Philips, resulted in a blackening of the inside of the glass bulb, which the red paint effectively concealed.Reasons for the red paint:Concealment of the internal process:During the manufacturing process, a substance called barium azide was used for the getter (a material that absorbs residual gas molecules inside the vacuum tube). When heated during manufacturing, this left a blackening or heavy internal coating on the glass envelope, which the external red paint covered up.Aesthetic appeal:The red color offered a more attractive finish compared to the blackening or silvery appearance of other manufacturers' tubes. It was a way to give the internal components of the radio a more finished and luxurious look.There are much more info about this, some say the paint can contain conducting parts,I just dont see how it can be connected to anything at the bottom.
Vintage TEK Museum Releases XY Demo Board showing Tektronix Scope logos - Page 1
Forum section: electronics / projects

author: RonFred2
author_rank: Contributor
timestamp: October 07, 2018, 11:54:01 pm
content: I would like to give a little shout out to Vintage TEK, a non-profit in Oregon that includes a museum, support for those that use old Tektronix scopes, and community outreach.I ordered one of their XY demo boards and it works perfectly. Here is a link to the board and their website:https://vintagetek.org/vintagetek-museum-releases-new-demonstration-board/Curious how others manage XY display on digital scope?

author: intabits
author_rank: Frequent Contributor
timestamp: October 09, 2018, 12:40:29 pm
content: Also, see links in the descriptions of the above videos.
vintage tube audio amplifier in solding stripes design - Page 1
Forum section: electronics / projects

author: Martin.M
author_rank: Frequent Contributor
timestamp: April 17, 2017, 08:04:04 pm
content: Restoration project of a RIM "imperator" 12 tubes mixing amplifier.redesigned with a complete new chassis, homebrew solding stripes.I am still working.greetingsMartin

author: calexanian
author_rank: Super Contributor
timestamp: April 17, 2017, 09:55:21 pm
content: Well that sure does look fancy.

author: chipss
author_rank: Contributor
timestamp: April 18, 2017, 11:30:32 am
content: Nice work, just stunning.

author: Vgkid
author_rank: Super Contributor
timestamp: April 18, 2017, 03:36:50 pm
content: That is impressive.

author: Martin.M
author_rank: Frequent Contributor
timestamp: April 18, 2017, 04:15:00 pm
content: please compare, this is the original Chassis, made in germany in the 60`s.I decidet to go another way in this restoration

author: palindrom71
author_rank: Contributor
timestamp: April 18, 2017, 06:03:33 pm
content: This is awesome!

author: capt bullshot
author_rank: Super Contributor
timestamp: April 18, 2017, 06:18:14 pm
content: Your chassis looks really neat, thumbs up!I hope it'l work ...There's an old story of someone working at Leitz (they made the famous Cameras) looking at a radio made by Philips (which had then a factory in the same town, Wetzlar).The Leitz man (Leitzianer) judged the Philips style (like your original chassis photo) to be a big mess. Then he re-made the radio (same schematic) in a neat and tidy way, all the wires that went all across nicely aligned and bundled an so on. Result: although the wiring was correct in theory, the radio didn't work anymore - because of all the parasitics and coupling between the wires.This is told to be happenend long time ago, but somewhat less long time ago the same thing happenend to me at work: I made a prototype on perfboard, with all the wires across, drew the schematic and told a ecolleague to build another two prototypes. They didn't work, he made it really neat and nice, with many wires too long and running in parallel so the parasitics killed the circuit

author: Gyro
author_rank: Super Contributor
timestamp: April 18, 2017, 06:55:44 pm
content: Make sure you hold onto all of those nice ceramic standoffs, they're hard (and expensive) to find these days.

author: calexanian
author_rank: Super Contributor
timestamp: April 18, 2017, 07:25:49 pm
content: I would be interested in seeing some comparison performance tests because sometimes messy assembly is actually not what it appears to be. It is very common in point to point style electronics to have chaotic routing be combat oscillation and noise. Wrap this wire around here and rub it up against that and it will work perfectly. Run it at right angles and its oscillating like an RF generator. I have encountered this many many times.
Virtex 7 2000T board current estimate  - Page 1
Forum section: electronics / projects

author: nth_degree
author_rank: Regular Contributor
timestamp: September 10, 2024, 04:09:17 am
content: I have a PCB that takes 12V input and hosts 4x Virtex 7 2000T FPGAs as well as connectors for two FMC daughter boards. What do I need back of the envelope? Best recommendation for a compact regulated power supply for this job?

author: RoGeorge
author_rank: Super Contributor
timestamp: September 10, 2024, 11:01:58 am
content: Any desktop PC power supply should work.

author: xvr
author_rank: Frequent Contributor
timestamp: September 10, 2024, 08:53:46 pm
content: Power consumption of any FPGA (and Virtex 7 in particular) is VERY dependent of RTL, loaded into them. Blank chip can consume a 10-100mA (you can find out exact number in Datasheet), fully loaded can consume up to tens of Ampere (close to 100A, IMHO)

author: RoGeorge
author_rank: Super Contributor
timestamp: September 10, 2024, 09:28:13 pm
content: The capsule of a Virtex is about the same size as a CPU, so probably no more than 50W. Better estimation might be done by the size of the radiator, if there is any.For the exact power for a given application, see this answer:https://adaptivesupport.amd.com/s/question/0D52E00006iHvuDSAS/power-consumption-zynq-virtex7-and-ultrascale?language=en_US
Virtual comm port management - XP - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: January 22, 2017, 05:40:27 am
content: I've got some legacy software that wants to talk via com3 (I use an ATEN USB<=>RS2323 dongle).I could not get it to connects and using a generic terminal program and a loop back plug I found that the USB ports (with the serial converter plugged in) are numbered:Com5Com6Com7Com8I'm assuming there is a way to delete these and have them reconfigure as com1...4.When I look in "control panel>system>device manager>hardware" under "ports(com & LPT)" all that shows is the current com (5,6,7 orthat the converter is plugged into.How do I go about resetting so I can access the converter on com1...4?Thanks.

author: oPossum
author_rank: Super Contributor
timestamp: January 22, 2017, 07:36:05 am
content: In device manager double click the COM port you want to change.Click on port settings. Click on advanced. Select the new port.

author: Ian.M
author_rank: Super Contributor
timestamp: January 22, 2017, 08:07:13 am
content: You cant change it to the same as any existing hardware (either a COM port or something else squatting on a legacy port address - possible if the motherboard chipset drivers are badly implemented). Plug in one USB serial device at a time and set them as you need. The first time you move a device to a different USB port or to a different place in a hub tree, it usually creates a new device manager entry and increments the port address unless the device has a hardware serial number so Windows knows it's the same as what was just unplugged from the old USB port.If that doesn't work, consider usingEterlogic VSPEor similar to remap the ports, however that wont play well if the legacy software is bit-banging the port lines (i.e. not doing normal serial comms with RS232 framing).

author: obiwanjacobi
author_rank: Super Contributor
timestamp: January 22, 2017, 08:22:11 am
content: Not sure if it will help, but:http://www.hhdsoftware.com/virtual-serial-ports

author: DTJ
author_rank: Super Contributor
timestamp: January 22, 2017, 10:32:45 am
content: Thanks guys.I went into the device manager. When I opened the USB serial item, under the advanced tab there was an option for setting the com port #. It showed com3, the one I wanted as "in use". I ignored this and set it to com3. When I plugged the dongle back in it set up as com3 and the legacy software connected and worked fine.Two hours for a 2 minute fix!
Vishay Dale CMF vs. RN Resistors (Wattage, Price and Size) - Page 1
Forum section: electronics / projects

author: Philipp F.
author_rank: Contributor
timestamp: May 01, 2018, 09:58:25 am
content: Hey,I was in the market for some decent quality resistors when I found the Vishay Dale CMF series. They seem to be highly regarded and look quite funky.Since I am very new to the whole electronics design aspect of things, I have some questions regarding the differences between the regular CMF Industrial and the mil-spec RN version.What I'm looking for are the 6.1x2.29mm sized ones so either CMF55 or RN55. What threw me off were the wattage ratings and prices.I see them rated as 0.5W@70°C and 0.25W@125°C and in other datasheets as 0.125W@70°C and 0.10W@125°C.Mouser has the CMF55 rated as 0.5W and the RN55 as 0.1W or 0.125W.So my question is, are they the same thing? To me it looks like the only difference are the larger wattage and voltage margins to meet the mil spec of the RN, RN has no RoHS and maybe tighter QC?So if I want 1/4W resistors could I just go for the RN, since in some cases they are quite a bit cheaper on Mouser?

author: bd139
author_rank: Super Contributor
timestamp: May 01, 2018, 10:07:41 am
content: I think they are same. RN's are derated heavily and with extra QA I assume. I have had both together and they look identical.I bought a load from RS here in the UK as 0.1% tolerance reference resistors.

author: CopperCone
author_rank: Super Contributor
timestamp: May 01, 2018, 02:55:06 pm
content: The military and the industry have different definitions of the same resistor type, i heard.I have 1/4 watt resistors, they are the size of like 1/8 watt resistors, military probobly rate for 1/16 lol

author: Cerebus
author_rank: Super Contributor
timestamp: May 01, 2018, 03:49:26 pm
content: Yes, it's just down to a different basis used for the power rating for commercial and military specifications.The CMF55 are available in an industrial rating with a power rating of 0.50W @ 75C ambient and 0.25W @ 125C ambient, and military rated with a power rating of 0.125W @ 75C ambient and 0.10W @ 125C ambient. They are essentially the same part, but the military spec ones use a different rating scheme and are guaranteed subjected to the full MIL-R-10509/MIL-PRF-55182J test procedures.

author: bd139
author_rank: Super Contributor
timestamp: May 01, 2018, 03:50:52 pm
content: Just a point on these. I've seen a couple of people in the past use them because they are colour blind and have numeric value written on the resistors.Then they go and solder them in value-side down. Something to remember when you are using them: make sure the value is pointing up
Vishay Thermistor Data - Page 1
Forum section: electronics / projects

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 20, 2017, 08:57:57 am
content: So, Vishay makes their thermistor data available as a spreadsheet.....sort of.It's a macro-enabled worksheet (Excel 2003).It's a clusterfuck of bothersome forms, and probably no actual spreadsheets. It seems it writes files for you. No way I'm letting that happen. It's bad enough I opened it once with macros enabled.So, if anyone's interested in a cleaned up copy: message me.Photographic proof:I can't post it publicly of course. But this wouldn't have been necessary at all if the creators had their heads out of their asses...Tim