VGA -> RCA AV, wait VGA has audio? China Dropshipping  - Page 1
Forum section: electronics / general

author: ESXi
author_rank: Regular Contributor
timestamp: October 23, 2019, 01:53:52 pm
content: So I was looking for this adapter on AliExpress. Ordered one cable for the video signal port but some sellers note clearly that it can also be used for audio...Wait, VGA with audio?I think the wires and RCA connectors are just fake dummies. How could it else be possible it must be fake? I will verify the RCA connectors when I receive it but it must be fake is my guess. It seems to be multiple sellers not just one.

author: borjam
author_rank: Unknown
timestamp: October 23, 2019, 02:06:38 pm
content: I guess it uses machine learning, reading the lips of the actors on screen and synthesizing voice.

author: Ian.M
author_rank: Super Contributor
timestamp: October 23, 2019, 02:19:06 pm
content: Its not *IMPOSSIBLE* as pin 4 is spare/reserved so one could theoretically depart from the standard and output mono baseband audio or stereo S/PDIF audio over that pin, but IMHO its unlikely to do much that's useful.It was probably copied from an adapter cable for a proprietary box that detected the presence of the adapter, not a monitor, and swapped to outputting composite video on green with L and R audio on red and blue or something similar. The S-video output is probably from a passive luma/chroma splitter

author: ESXi
author_rank: Regular Contributor
timestamp: October 23, 2019, 02:46:51 pm
content: Quote from: Ian.M on October 23, 2019, 02:19:06 pmYep. But what about audio ground, could that be pin 5 which is a signal ground? (not sure, my guess is no). Also the device you are plugging in the VGA male in to would have to support this. It would be mono audio at it's best. So Left and right is also fake.Probably the seller making a mistake. Might just be for the other video channels for colour output but I highly doubt it.Anyways I need it only for the yellow video out RCA, so that should be fine. But I really would like to test this when I get the adapter.

author: newbrain
author_rank: Super Contributor
timestamp: October 23, 2019, 05:15:39 pm
content: Have you read the full descriptions?I didnotfind that exact same shop, but all the sellers with that cable state:QuoteOr, even more clearly:QuoteOr something to that effect.So it's just a passive adapter, not going to convert VGA to S-Video o composite.EtA: found the store, and it has the same statement as the others.

author: Kean
author_rank: Unknown
timestamp: October 23, 2019, 11:02:56 pm
content: Quote from: ESXi on October 23, 2019, 02:46:51 pmI think you actually need something like thishttps://www.aliexpress.com/item/32914602922.html

author: BrianHG
author_rank: Super Contributor
timestamp: October 23, 2019, 11:42:22 pm
content: Quote from: Kean on October 23, 2019, 11:02:56 pmLOL, maybe the audio out there is a synthesized voice which states the video mode you PC is outputting...

author: ESXi
author_rank: Regular Contributor
timestamp: October 25, 2019, 11:17:20 am
content: Quote from: newbrain on October 23, 2019, 05:15:39 pmMy brain was confused, didn't read the description of the seller because I knew what I needed, also it seems my TV monitor(cheap china crap that I got for free) that I had didn't support TV out and my pc monitor did however the colour output wasn't really black and white but rather like yellowish greenish lol. I was mixing up VGA PC out with VGA in TVs tuners, decoders. Which are VGA with TV OUT.It's this one, but yeah. Actually you don't know what you're doing because there is no pinout and pin description.. It's just connect pin x to y and use this value resistor and this value(uF) cap.Not that it's chinees. The three wires above are RGB channels and then you have two wires for V and H sync..

author: Kean
author_rank: Unknown
timestamp: October 26, 2019, 06:12:47 pm
content: Quote from: BrianHG on October 23, 2019, 11:42:22 pmThe audio is just pass-through on that - as you'd expect.

author: Kean
author_rank: Unknown
timestamp: October 26, 2019, 06:16:31 pm
content: Quote from: ESXi on October 25, 2019, 11:17:20 amThat circuit will give you B&W version of the RGB, as there is no colour encoding. The converter I linked about will provide colour, but they aren't great. CVBS is just not up to VGA quality, let alone modern digital video standards.