Hi,
Another point to learn: an advertisement is no datasheet.
Every device comes with a datasheet.
If there is a device without datasheet: in most cases it's not worth buying it.
All professionals need to read datasheets. Many pages, many files. Daily.
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You ask to use a resistor. You urgently need to know and to use Ohm's law. It tells you how to calculate the resistor value.
With the use of voltage and current. Without current it is impossible to calculate. Without having a clue about current it is even impossibke to estimate the resistor value.
It really is impossible to design a circuit that contains a single resistor, without knowing the current.
--> your post#4 is useless, because it's incomplete.
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Designing electronics goes this way:
* idea, with requirements. Values
* search for solutions, schematics, application notes, design notes, explanations
* decide which schematic you want to use
* search for parts, reading datasheets, calculating part values
* (simulation)
* building a prototype
* testing the prototype
None of the above I've ever seen in your posts.
So if you seriously want to design electronics, then start to operate seriously. And show this to us.
Please understand: We want to help you, we want to see your progress. We want to see your effort.
This motivates us to support you.
But if we just see random unelaborated ideas... without any progress, we will loose motivation.
Klaus