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Help on getting schematics from scratch?

MegaCodeX , 09-27-2023, 04:13 AM
l would like to ask a question, l am still starting in hardware design. So l would like to make a Bluetooth speaker.

l wanted to ask on how l can design the schematic from scratch. I have been struggling to understand how l should draw a schematic diagram for it. Any help on courses or anything on schematic design.
QDrives , 09-27-2023, 07:14 PM
One way to start a design from scratch is to create a block diagram.
However, that does require some knowledge or at least expectations on the blocks needed. For this, you need to know either 'general' components or components that are able to do the function you want.
Now my question is: do you (think you) know the components you need and just getting the schematic right or do you have no idea what is needed for bluetooth speakers?
MegaCodeX , 09-28-2023, 10:00 PM
I think I know some information that I need a speaker, battery, Bluetooth module, probably a microcontroller and a way to protect the battery. That’s what I know so far. So it might be about getting the schematic right and the best way to choose the components
QDrives , 09-29-2023, 07:10 PM
"...and the best way to choose the components" -- that could be one of the hardest parts.
One thing I am missing in your list is the amplifier.

One way to choose components is the following:
- Try to find (evaluation) modules that do the function you want.
- Check the schematic of that module and use the components used to get to the next 'application note'. That way you can find one through another.
- Make sure your design is like 'end-to-end'. In this case from the battery -> filter/protection/charger -> amplifier -> speaker.
- Do not forget the connectors.

As for the schematic - just keep each 'block' (amplifier, microcontroller, battery, etc.) on separate pages.
Robert Feranec , 09-30-2023, 09:10 AM
often projects don't start from "scratch", but development modules / development kits / evaluation boards connected all together. You don't have to buy them, but you can use their schematics, redraw them into your schematic and connect everything there. Of course, you can do everything from scratch, but using existing and working circuits lowers risk of problems and speeds up development time. Follow @QDrives recomendation above
MegaCodeX , 10-01-2023, 05:28 PM
Thank you Sir Robert Feranec
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