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Questions tagged [video]

Specify video format, e.g. NTSC, ATSC, VGA, etc.

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What does a grid-cathode bypass capacitor on CRT do, and why is this one not doing it?

I have modified a (US) 1970s solid state B&W TV set for direct (NTSC) composite input for vintage computer use, in accordance with some equally vintage instructions specific to this set. The set ...
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How to change the gain for this amplifier?

I'm modifying a hot-chassis TV to add a Y/C input. To isolate the inputs, I'm using an optocoupler with the following circuit: The jungle IC, however, requires a 4.5Vpp signal on the chroma line: Is ...
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WHY does the LED turn on SLOWLY?

TL;DR ver: LED light controlled with Arduino lights up during an interval of 2 frames, not one in a video footage of 30 FPS. It slowly turns on... but why? ===== I have a (mouse) behavioral experiment ...
Chanhee Jeong's user avatar
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Obtaining analog video from car LVDS interface theoretical question

Got a theoretical question. A car has 4(5 with GND) pin FAKRA connector between head unit (NAC) and head display. 2 of them are mentioned as LVDS+ and LVDS-. As far as I understand, it's 2-way gigabit ...
Alex Smirnoff's user avatar
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3 answers
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Optocoupler as a switch for composite video sources

I want to switch between 2 video sources (cameras) to a common video receiver. Is general purpose optocoupler suitable for that? Here is the schematics: In more details, the video switch is ...
brigadir's user avatar
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Feeding multiple analog video channels onto a common bus - signal integrity issue?

Consider the following simplified schematic: The intention here is to have multiple analog video input channels selectively coupled trough an analog switch onto a shared bus (this bus will be on a PCB)...
nonius's user avatar
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Connect internal CRT's RGB to external LCD

In my boat i have a sonar with CRT monitor and no external video output. I would like to connect a LCD monitor instead. Schematic below show the RGB signals internally. Reg pic. My question is: If ...
Thor's user avatar
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How can I read analog video signal from a FPV camera with a Raspberry Pi?

I want to do a few experiments with video encoding and transmission, so I need to somehow read the analog video signal (PAL or NTSC) in to the computer and process it. I need to read an analog video ...
Robotex's user avatar
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Transmitting differential video signal to the ADC input

I'm designing a circuit that converts a single-ended analog video signal (f = 10 MHz) to a differential pair and then is processing the data to a digital form. The signal is transmitted through a ...
drydre's user avatar
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Why is the Gb/s usually matched with the GHz for SDI?

My knowledge in electronics and RF(because high speed data) is very surface level but attempting my best. I'm attempting to do an application which utilizes 3G SDI, but am not understanding why there ...
andy's user avatar
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ON TV Decoder Magazine Article/Circuit?

Starting in the 1970s, there was a scrambled TV service transmitted over the air called "ON TV" in our region. I think "Radio Electronics" magazine published an article about ...
kackle123's user avatar
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Attempting to reconstruct a simple analogue video RGB->YUV matrix (digital logic)

I’ve recently been trying to crack a difficult problem without much luck. I’m trying to re-create an early analogue video text generator device which generates text overlays and outputs as either RGB ...
Matthew Millman's user avatar
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RS-170 and SMPTE 170M Encoder

I have been searching for a Video Encoder (DAC) that can output composite signals that are EIA-170/RS-170 and SMPTE 170M standard compliant. I might not be understanding these standards correctly but ...
miggyEE's user avatar
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2 answers
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Genlock Analog Video

I am currently converting an TMDS signal into composite. Please see block diagram. The video encoder outputs the H-Sync and V-sync. I am also getting an external sync source that I need to use to ...
miggyEE's user avatar
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Convert Composite Video to RS-422 [closed]

I misinterpreted my requirements and asked the question below, which does not make sense. I am designing a Digital (TMDS/HDMI) to Analog (Composite) video circuit. I am almost to the end. The last ...
miggyEE's user avatar
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How can I connect the DVP camera output with Raspberry Pi or other MCU?

I have a MT9V034 image sensor module and I want to use its 8-bit DVP output. Does anyone know how to connect a DVP interface with a Raspberry Pi and show some graph? I have read the Raspberry Pi user ...
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Can you damage a MIPI screen with incorrect timings / config?

Per the title really, I've been battling with (very VERY similar) MIPI screens from a few suppliers and they've been throwing different timings and configs / initialisation sequences at me... well, to ...
John U's user avatar
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Analog video crop circuit

I have an old 16:9 CRT TV that has a zoom function. If the input signal is 4:3 letterboxed, in zoom mode it will only show the middle part stretched to the full screen leaving the black bars above and ...
tpimh's user avatar
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Television repair - connectors and standards for display panel and controller boards

All my experience comes from 2 flat TVs, so my knowledge is quite reduced and questions have to be quite broad. Questions: Are there standards or common practices from manufactures about connections ...
Daniel Perez's user avatar
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20-pin LVDS (DF14-20P) to USB/HDMI for post-processing?

I am looking to convert a 20-pin LVDS (DF14-20P) signal from a thermal imager to another format (i.e. HDMI) so that I can do post-processing on a Raspberry Pi, OAK-Som, or similar. Everything I can ...
Cajer's user avatar
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How standardized are LCD panels?

I have a project in mind where I would like to re-use LCD panels from old monitors to save them from landfills. I'd like to bypass the existing driver and implement my own controller to bypass all of ...
user175173's user avatar
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Very dim composite video output and very low oscilloscope readings

I got my hands on an old Sony FCB-EX1000P color block camera. It has composite and S-video output and supports VISCA for communication. I've been able to build a rough Arduino program to send and ...
Nif's user avatar
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What's the intuition behind connecting a wire shield to the ground plane on a bare board?

I have an old (1970s) PCB that generates a (baseband, composite) NTSC video signal. It is a bare board without a containing chassis or case. I am using a shielded cable for the video output line and ...
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Pros and cons connecting R2R directly to FPGA/CPLD

I am designing the R2R-based DAC circuit (5 bits per channel) for the video output @ 25.17 MHz. Looking for advice to ensure I didn't overlook something very important. Initial design was CPLD -> ...
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Need help connecting a speaker to a video card

I have this video card which uses a 4-pin JST connector for the speaker: PL+ PL- PR- PR+ I was using this speaker which has a 4-pin JST connector: What I thought is: One red wire is for the left (...
Just doin Gods work's user avatar
2 votes
1 answer
105 views

How is this bit of logic generating its short output pulse (and is it supposed to be longer)?

I'm debugging a 1970s bitmap video generator board, and potentially among other issues it's not syncing happily to the old B&W video monitor I'm using (which is quite forgiving). The NTSC video ...
BZo's user avatar
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What is my next step to debugging an old NTSC video generator circuit that doesn't sync?

I know this is somewhat broad but I hope it's appropriate here. I have a 1970s PCB that is designed to output a sort of bitmap video image via a standard NTSC signal. It came to me as a half-built kit ...
BZo's user avatar
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2 answers
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Why does the LM1881 make an odd/even signal even with progressive inputs?

I noticed that when I apply a 720p or higher signal to an LM1881, the odd/even pin outputs a square wave signal which it shouldn't. On 240p it doesn't, as expected. Did I miss something? My input is ...
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1 answer
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NTSC Video signal frequency

This a part of a video signal (NTSC). The active video part is plotted on the screen. In my understanding, there are parts cut away by the "fly back and the settle" for preparing to plot the ...
ozw1z5rd's user avatar
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LM1881 noise at CSync output when not connected to anything

Im trying to get CSync and VSync out of an composite video signal. This is my schematic: It's the same circuit as in the documention of the LM1881. In general it works well, but I noticed something: ...
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3 answers
1k views

How to determine the horizontal pixel count out of a HSync and VSync signal

I have a project where I want to read the HSync and VSync signal from a VGA cable into an microcontroller and calculate the pixel clock. Calculation: Pixel clock = Horizontal Pixel Count * Vertical ...
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2 answers
424 views

Identify IC with label removed [closed]

I have an IC which is used for a display that has the IC chip number scratched off. The reason being more than likely that the board would be fairly inexpensive to produce but the combo board and ...
New's user avatar
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What is a circuit I could use to generate valid analog TV signal?

What is the simplest valid analog TV signal and what circuit is required to generate it?
John Palermo's user avatar
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1 answer
2k views

HDMI audio pin-out

I have two HDMI outputs, one of them has only video, the other only sound. What I want to do is combine two HDMI cables and get the video and sound at the same time with only one HDMI cable. But I am ...
sweetngx's user avatar
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How to send AHD video wirelessly to an Android device (short range ~3m)?

I have an underwater camera (wired to the water surface) which streams AHD digital video to a RG59 connector. I would like be able to stream the video to an Android device. It doesn't have to be a ...
petunia rose's user avatar
1 vote
1 answer
171 views

Ethernet to RCA [closed]

I'm trying to get a few cameras (RCA) to connect to a multiplexer and then display their feeds on a monitor, but with one of those cameras connected to my computer instead. I ran into a bit of a ...
iceninja21's user avatar
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3 answers
940 views

Does VGA (video graphics array) carry an analog-modulated digital video signal?

If VGA (video graphics array) is analog, then how is it compatible with a digital monitor? When I say "digital monitor", I am referring to TFT LCD display monitor. My guess is that maybe it ...
Noob_Guy's user avatar
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1 answer
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Effects of too-frequent serrations in vertical sync pulse on analog horizontal deflection oscillator

Normal analog TV video signal has a vertical sync pulse with serrations to help keeping the horizontal oscillations in sync. Also, as I understand it, in case of an interlaced video, these serrations ...
Dmitri Urbanowicz's user avatar
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TVP5150 output 0x80,0x10 and input video signal not locked

This is my first question, I hope everything is ok :) I have been struggling with a problem for a while now. I have a PAL camera (from which I barely have any information) connected to a TVP5150AM1 IC ...
Iago Loureiro's user avatar
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1 answer
273 views

How to control a 12V relay from variable voltage source of a LED?

I'm new to electronics and need your help. I have retrofitted a Chromecast to my car and have powered it using a cigarette lighter power adapter to USB. Currently the power adapter is hidden and ...
Svetoslav Chakaroff's user avatar
1 vote
2 answers
1k views

Correct order of monitor/display timing

I'm trying to make a video timing generator on an FPGA. I'm finding a difference online in the order this occurs: Here's one version: and here's another: Where this seems inconsistent: If scanning ...
Sittin Hawk's user avatar
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320 views

Sync stripper circuit for RGsB to RGBHV converter

Currently, I have a RGsB signal source, ISL59885 sync separator and RGBHV monitor. Green is the same on the input and output connector (meaning, sync-on-green, not the perfect clean green signal). ...
tpimh's user avatar
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2 votes
1 answer
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Terminating unused SDI/BNC input

I use the Magewell Eco Capture Quad SDI M.2 (a small form factor quad-channel) capture device which keeps overheating after a few minutes (up to 100 C). I've read that this might be due to cameras not ...
Random's user avatar
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Looking for an explanation of grounding in relation to computers and DVI-HDMI adapters

I recently found that a DVI-HDMI adapter, purchased to connect the micro-HDMI port on my new Raspberry Pi 400 to the DVI port on my monitor, behaves strangely: it works well when connecting to my ATX ...
Theo d'Or's user avatar
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Translating 5-wire camera output to composite signal

An existing OEM rearview camera has 5 wires (V+, LVDS+, LVDS-, LIN, ground). Is there a way to translate (hook up) this to a standard composite cable that goes into back of a aftermarket head unit? ...
MikeV's user avatar
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1 vote
1 answer
262 views

Macintosh Classic video input

I want to modify or rebuild the video amplifier circuit of the Macintosh Classic so that it accepts 8 bit grayscale input. Original circuit accepts 1 bit 5V P-P video signal. First idea was just to ...
Farid83's user avatar
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3 votes
3 answers
2k views

How to determine if a video signal is interlaced

I know what the difference between interlaced and progressive scan is: in progressive video modes, the monitor displays all the lines of a video field sequentially. In interlaced, it displays them on ...
pjc50's user avatar
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ICs for PAL Hsync and Vsync

I have taken the circuit above from a “DIY Pong” tutorial. The circuit generates the HSync and VSync for a PAL signal. What are the labels for classification of an IC equivalent of this?
Learner's user avatar
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How effective is the Intel video Frame Buffer core when storing in memory?

The Intel Video and Image Processing (VIP) Suite IP has a Video Frame Buffer (VFB) core, named Frame Buffer II IP Core, that can take streaming images on the Avalon-ST IF and save them into memory ...
EquipDev's user avatar
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Convert RGB to the composite video / S-video (math)

I used to do it in circuits with CXA1645 or AD725. But this question is not about soldering, it is about math and digital processing. Imagine I am designing the entry-level graphics processor using ...
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