Re: Unibox - WIP 2020 EUzebox BOM
Posted: Fri Jul 17, 2020 4:47 pm
Yes, you're right! I'm not going to be replicating that thing!
As for the BOM, the most important thing is having a list of the 'exact' components. The source and price etc are secondary.
As I said in my first post, I know nothing about electronics. This is my first ever project so I've got some newbie questions for you.
I'm looking into wiring up the power circuit. I am presuming that the ground pin on the 7805 linear voltage regulator will be used as the ground? I'll have to buy a screw to screw the LVR into the breadboard. Would a certain material, type or size of screw be better for screwing into a breadboard or do I need to stick something between LVR and the breadboard before attaching it? Would you recommend placing some washers either side of the LVR screw hole?
Once the LVR is attached to the board, do I need to wire from the LVR ground pin to the ground pin on the power connector? I'd presume so but assume that I know nothing because that is the case. Nothing should be considered too obvious not to mention!
In this screenshot of the power schematic, I am presuming that the horizontal black lines I have circled in red mean 'wire this to ground'? That looks more like the battery symbol than the ground symbol to me so I'm not sure, being totally new to this. If it is ground, is it to the LVR ground or to the ground pin on the power connector or both?
I'm not too sure about the +5 coming off the 10u/10v (or in my case, 10u 6.3v - do we think this will work? It does afterall say 9-12V on the schematic) does that mean that the positive terminal of the C5 capacitor is now the +5v 'source' (for the rest of the board)?
I have attached a photo of my 10uf 6.3V cap next to a 7805 for size comparison. These are apparently used on the normal UB but I'd have to order some 10uf 10v caps if you don't think I'll get away with using a 6.3V cap instead. I attached this pic because the cap looks significantly smaller to me than the C5 cap shown in Euzebox construction guide but then again it is just over half its voltage.
The following pic shows how I currently intend to lay out the power components. I've not soldered any of these in place yet. Does this proposed layout look sensible enough?
I have deviated from the normal Euzebox layout in the positioning of the power connector because the board isn't wide enough to fit the power connector on the top edge. It is only just wide enough to fit the SD card adapter and the SCART connector next to one another.
As for the BOM, the most important thing is having a list of the 'exact' components. The source and price etc are secondary.
As I said in my first post, I know nothing about electronics. This is my first ever project so I've got some newbie questions for you.
I'm looking into wiring up the power circuit. I am presuming that the ground pin on the 7805 linear voltage regulator will be used as the ground? I'll have to buy a screw to screw the LVR into the breadboard. Would a certain material, type or size of screw be better for screwing into a breadboard or do I need to stick something between LVR and the breadboard before attaching it? Would you recommend placing some washers either side of the LVR screw hole?
Once the LVR is attached to the board, do I need to wire from the LVR ground pin to the ground pin on the power connector? I'd presume so but assume that I know nothing because that is the case. Nothing should be considered too obvious not to mention!
In this screenshot of the power schematic, I am presuming that the horizontal black lines I have circled in red mean 'wire this to ground'? That looks more like the battery symbol than the ground symbol to me so I'm not sure, being totally new to this. If it is ground, is it to the LVR ground or to the ground pin on the power connector or both?
I'm not too sure about the +5 coming off the 10u/10v (or in my case, 10u 6.3v - do we think this will work? It does afterall say 9-12V on the schematic) does that mean that the positive terminal of the C5 capacitor is now the +5v 'source' (for the rest of the board)?
I have attached a photo of my 10uf 6.3V cap next to a 7805 for size comparison. These are apparently used on the normal UB but I'd have to order some 10uf 10v caps if you don't think I'll get away with using a 6.3V cap instead. I attached this pic because the cap looks significantly smaller to me than the C5 cap shown in Euzebox construction guide but then again it is just over half its voltage.
The following pic shows how I currently intend to lay out the power components. I've not soldered any of these in place yet. Does this proposed layout look sensible enough?
I have deviated from the normal Euzebox layout in the positioning of the power connector because the board isn't wide enough to fit the power connector on the top edge. It is only just wide enough to fit the SD card adapter and the SCART connector next to one another.