• 3 Posts
  • 115 Comments
Joined 2 years ago
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Cake day: June 15th, 2023

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  • Last year I wanted to set up a budget media PC and got enamored by this video: https://www.youtube.com/watch?v=WCDmHljsinY

    I got a 600 G3 with the 4560 processor, installed Debian onto it and hooked it to my 4k TV mainly to run immich and stremio.

    Immich runs just fine, though I have gotten too fast behind its upgrades and having less knowledge about Docker, I’m afraid to update immich. Need to figure that out.

    But what disappointed me was that my good quality videos (even the downloaded ones) are choppy to run (unlike the fluid expectations from the video above) and I don’t really know what I should look into to make it better.




  • I have a question for you that I’ve not been able to get answer to by normal googling or asking the GPTs.

    I need to focus light from cinema projectors using camera lenses. As you might be aware, projectors may use lamp or LED as their primary light source. The former used more wattage for producing same lumens of light.

    My question is: if I choose two projectors of each type that give out same lumens of light and I focus all of it with my lens, will one of them heat up my lens more than the other? I’m other words I’m just talking about the heat perception of light of equal intensity from the two sources and not how much heat is generated in creating them, if that makes any sense.

    Thanks!




  • The typical home routers don’t support more than 20-25 simultaneous connections last i checked. I’m sure there must be professional devices that allow thousands of connections like they use in public wifi spots but I’m also sure they would be much pricier.

    At this point, it is just a pursuit for understanding how these things work and if what I want can actually be made possible as alternative use case of WiFi, especially given how ubiquitous it is.

    Thank you for indulging me nonetheless.


  • I’m honoured that you took the time to type all this out but it looks like I’ve failed yet again at conveying what I meant to ask and I’ll try to rephrase:

    What you have been explaining is broadcasting when all devices are connected to the same network. I want to understand if it is possible to use WiFi just like a radio to broadcast data, without actually connecting. A device can transmit/broadcast, say, a video over the EM waves using some kind of modulation like they do in FM. The receiving devices, like our phones, already have hardware to receive these waves and process it to extract the information. Like I said, it already happens where the SSID of the WiFi transmitter/router is seen by all devices without actually connecting.

    And before you say anything, yes I’m aware that it is a very small amount of data being ‘transmitted’ at a very low bitrate. But what is the limiting factor? Why can’t much more data be transmitted this way?

    I’m really sorry if there is a silly answer to this as I’m sure there must be. But, like I said, i could never find it in my searches.

    Thanks and cheers!



  • I’ve wondered for a long time if it is possible to use WiFi as broadcast/multicast? I mean, i understand that it won’t work out of the box, but if one was to write code from ground up (ie different TCP protocol) can it be made possible to, say, transmit video lecture from one WiFi router and for multiple mobile phones to receive and view it without individually being connected to the network. Kind of like how everyone is able to view the SSID of the WiFi node without being connected.

    Or is it a hardware level problem that I can’t wrap my head around. I have wanted to understand this for a long time but I don’t have a background in this subject and don’t know the right questions to ask. Even the LLM based search tools have not been of much help.







  • I am not sure if this will pique your interest but I find kinetic sand tables really fascinating. Sisyphus came up with it first and there have been a number of open source implementations in due course. One way is to implement it using a scara arm mechanism but they have the problem of load weight in the case of long arms.

    I came across this design that rethinks the design using an elegant rack and pinion arm but still needs a belt that may go out of calibration over time. This looks to be improved further using [two, concentric rings] (https://frew.io/work/sisyphish) but this design is not available to explore/copy.

    I have no idea about 3D designing, but I would love to create a table one day: something that will not need constant adjustment. If you get around to taking this up, I would love to see what design improvements you can come up with.