Smikkelbakje/Drone-FabAcademy-2025
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speaker stuff

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Sam Hos
2025-03-03 11:01:34 +01:00
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docs/Assignments/week_6_electronic_design/electronic_design.md
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@@ -53,6 +53,7 @@ When searching online and on older fab academy projects I found that people ever
After searching for a while I found [this](https://www.instructables.com/How-to-Make-Simple-Amplifier-Circuit-Without-IC/) on Instructables After searching for a while I found [this](https://www.instructables.com/How-to-Make-Simple-Amplifier-Circuit-Without-IC/) on Instructables
![alt text](image-16.jpg) ![alt text](image-16.jpg)
##### Understanding resistors
The only step I needed to figure out is why it work like this and why doesn't the speaker blow up when connected because there is 9 volt on the circuit and the speaker is rated for 1 volt. I still have a lot of trouble wrapping my head around how voltage drops because of a resistor. The only step I needed to figure out is why it work like this and why doesn't the speaker blow up when connected because there is 9 volt on the circuit and the speaker is rated for 1 volt. I still have a lot of trouble wrapping my head around how voltage drops because of a resistor.
Voltage can be seen as the speed of water traveling through a tube. A resistor makes the tube smaller for a small part so the water slows down. So the voltage drops. Voltage can be seen as the speed of water traveling through a tube. A resistor makes the tube smaller for a small part so the water slows down. So the voltage drops.
@@ -62,4 +63,22 @@ Resistors always cause a voltage drop. How big the drop is depends on the amount
```math ```math
V = I * R V = I * R
``` ```
This is Ohms law. So to keep a constant voltage you need to make sure your current is also constant and not changing constantly. In that way you can keep a constant voltage. This is Ohms law. So to keep a constant voltage you need to make sure your current is also constant and not changing constantly. In that way you can keep a constant voltage.
#### Back to the speaker
I watched [this](https://www.youtube.com/watch?v=U0FIG2J6Zls) video and now understand the fundementals of a amplifier. The only thing necessary is something that can make an small signal big. For that I can use a MOSFET. I also need to make sure the MOSFET doesn't over current the speaker so that's why it needs a resistor before the gate pin. And I need some sort of buffer for the speaker once it needs a lot of power.
![alt text](image-17.png)
When I was looking for MOSFET's through the Fab library I found 2 type of MOSFET's P channel and N channel. I quickly searched what it does.
![alt text](image-18.png)
So for my use case I will need a N channel MOSFET that can work output a linear voltage based on what is supplied on the gate.
![alt text](image-19.png)
I first had this setup. But then I asked AI for feedback and it told me I used the wrong transistor because it could only be on or off and not anything in between.
![alt text](image-20.png)