Hi all.
I am a long time electronics enthusiast, i learned the basics next to my father and not in a school so apologies for not having a graps of a few things that should be taken for granted. I mod consoles and other electronics from time to time and i have a fairly good understanding of components.
I want to make a video (scart) switch for my gameroom, as i want to connect a lot of consoles together in a single output but all current offerings of a scart switch in the market are either overbloated and overpriced or too cheap and bad performing. This is just a hobby project i would like to do for fun mainly.
I came across a solution somebody else made using 8 x CBT324 8bit bus switches 'stacked' together and choosing which one to connect using a manual switch and i have a few questions, some of them laughably 101 electronics and digitals and although we did have some training in uni, i cannot for the life of me remember these bits:
1. the CBT324 is only an 8bit single bus switch. I would love to use something more versatile like 8 x 10bit bus switch or even 2 or 4 x 10bit ones to make the layout/pcb smaller/easier with less components. I know i can use multiplexers or encoders BUT this is addressed in another question. Is there another IC that i could use that you know that could handle 10bit buses better so i can connect more devices in, yet only have 10bits 1 way out?
2. How can i understand if an IC can handle analogue voltages across, rather than just digital in/out? For example in a datasheet about the philips CBT324, it explains that the Vin/Vout max is 7v, so it seems it is fine for using it with analogue sources such as video/audio (as long as the voltage needs are covered) but i do seem to remember that encoders/decoders/multiplexers are purely digital (as an example of course) or other bus switches that could be purely digital on/off only, rather than 'connecting' one side to the other whatever comes in/comes out. Hope i make myself clear, the sea of available options is overwhelming to say the least. (philips pdf here https://4donline.ihs.com/images/Vip...3-1.pdf?hkey=EF798316E3902B6ED9A73243A3159BB0)
3. Which software can i use to interactively simulate what i am going to build, before i build it? I used easyEDA, some spice programs, even tina and others but STILL, for the life of me, i cannot simulate something interactively (for example by putting switches that react to a led let's say) that i can debug 'visually'. Most of these software are amazing to build, but simulating just produces a list of values in a text response, not very helpful to say the least. I know this is kind of hard to answer since we need to take libraries into consideration, but not sure which one hits the spot better.
4. Which component do i need to switch between enabling/disabling each bus switch/IC (whichever it is going to be) using discrete buttons or a remote or even an up/down button? In case i have say 8 discrete buttons to choose which input to send to the output, an obvious 8bit switch should be enough, but i would need the switch to be mutually exclusive (so you cannot turn on bus1 and bus4 at the same time) and in case it is up/down it would need something to store current value or maybe a shift register (but output would then be in binary so probably need a decoder on the other hand...) I found a 4/8bit switch but not sure how i can make it mutually exclusive, if even these exist?
So, please don't stone me for being a noob, i studies some circuit design back in uni and i know if i persevere enough i can find all the answers on my own, but i am stuck at a few of these things and this is why i want a nice design software too, so i can drop components and see how they react
any help greatly appreciated
I can post a 'suggested' design if it helps?
I am a long time electronics enthusiast, i learned the basics next to my father and not in a school so apologies for not having a graps of a few things that should be taken for granted. I mod consoles and other electronics from time to time and i have a fairly good understanding of components.
I want to make a video (scart) switch for my gameroom, as i want to connect a lot of consoles together in a single output but all current offerings of a scart switch in the market are either overbloated and overpriced or too cheap and bad performing. This is just a hobby project i would like to do for fun mainly.
I came across a solution somebody else made using 8 x CBT324 8bit bus switches 'stacked' together and choosing which one to connect using a manual switch and i have a few questions, some of them laughably 101 electronics and digitals and although we did have some training in uni, i cannot for the life of me remember these bits:
1. the CBT324 is only an 8bit single bus switch. I would love to use something more versatile like 8 x 10bit bus switch or even 2 or 4 x 10bit ones to make the layout/pcb smaller/easier with less components. I know i can use multiplexers or encoders BUT this is addressed in another question. Is there another IC that i could use that you know that could handle 10bit buses better so i can connect more devices in, yet only have 10bits 1 way out?
2. How can i understand if an IC can handle analogue voltages across, rather than just digital in/out? For example in a datasheet about the philips CBT324, it explains that the Vin/Vout max is 7v, so it seems it is fine for using it with analogue sources such as video/audio (as long as the voltage needs are covered) but i do seem to remember that encoders/decoders/multiplexers are purely digital (as an example of course) or other bus switches that could be purely digital on/off only, rather than 'connecting' one side to the other whatever comes in/comes out. Hope i make myself clear, the sea of available options is overwhelming to say the least. (philips pdf here https://4donline.ihs.com/images/Vip...3-1.pdf?hkey=EF798316E3902B6ED9A73243A3159BB0)
3. Which software can i use to interactively simulate what i am going to build, before i build it? I used easyEDA, some spice programs, even tina and others but STILL, for the life of me, i cannot simulate something interactively (for example by putting switches that react to a led let's say) that i can debug 'visually'. Most of these software are amazing to build, but simulating just produces a list of values in a text response, not very helpful to say the least. I know this is kind of hard to answer since we need to take libraries into consideration, but not sure which one hits the spot better.
4. Which component do i need to switch between enabling/disabling each bus switch/IC (whichever it is going to be) using discrete buttons or a remote or even an up/down button? In case i have say 8 discrete buttons to choose which input to send to the output, an obvious 8bit switch should be enough, but i would need the switch to be mutually exclusive (so you cannot turn on bus1 and bus4 at the same time) and in case it is up/down it would need something to store current value or maybe a shift register (but output would then be in binary so probably need a decoder on the other hand...) I found a 4/8bit switch but not sure how i can make it mutually exclusive, if even these exist?
So, please don't stone me for being a noob, i studies some circuit design back in uni and i know if i persevere enough i can find all the answers on my own, but i am stuck at a few of these things and this is why i want a nice design software too, so i can drop components and see how they react
any help greatly appreciated
I can post a 'suggested' design if it helps?