Merge pull request #2240 from tah997/patch-6

Grammar fixed and improvements to style opamp.md

Author: karlsoderby

content/hardware/02.hero/boards/uno-r4-wifi/tutorials/opamp/opamp.md

@@ -27,7 +27,7 @@ In this article, you will learn:
 
   - [Arduino UNO R4 WiFi](https://store.arduino.cc/uno-r4-wifi)
   - resistors
-  - Jumper wires
+  - jumper wires
 
 
 ## Operational Amplifier (OPAMP)
@@ -55,33 +55,33 @@ A voltage amplifier, as the name suggests, amplifies the voltage. A simple 2x am
 
 ***The amplified output signal should not go above ~4.7 V, otherwise clipping will appear and you can damage the board***
 
-Below is a capture of an oscilloscope in which an approx. 2 V square wave (green, channel 2) is amplified to a 4 V square wave (yellow, channel 1) with the circuit shown below. The input signal was generated by a function generation (and shared GND was connected).
+Below is a capture of an oscilloscope in which an approx. 2 V square wave (green, channel 2) is amplified to a 4 V square wave (yellow, channel 1) with the circuit shown below. The input signal was generated by a function generator (and shared GND was connected).
 
 ![Oscilloscope measurements](./assets/amp_screenshot.png)
 
 But let's say you want to amplify the voltage signal 4x instead of 2x. The amplification of an OPAMP mainly depends on the chosen resistor values. Take a look at the formula below:
 
 ![Calculate resistor value](./assets/calc.png)
 
-**Av** = Amplified Voltage (V)
+**Av** = Amplified voltage (V)
 
-**R1** = Resistor connected to Ground (Ω)
+**R1** = Resistor connected to GND (Ω)
 
 **R2** = Feedback resistor (Ω)
 
 We know we want to amplify the voltage times four so:
 
 **Av** = 4 V
 
-Now, we need to figure out what resistors to choose. Because we only can solve for one unknown value we choose a predefined value for one of the resistors, e.g. 10k Ω for R1.
+Now, we need to figure out what resistors to choose. Because we can only solve for one unknown value, we choose a predefined value for one of the resistors, e.g. 10k Ω for R1.
 
 **R1** = 10k Ω
 
 Your formula should now look like this:
 
 ![Add values to the formula](./assets/numCalc.png)
 
- That leaves R2 as the only unknown variable. Now, Subtract one from both sides and multiply by ten, which leaves us with:
+ That leaves R2 as the only unknown variable. Now, subtract one from both sides. Next, multiply both sides by ten thousand (10k), which leaves us with:
 
 **R2 = 30k Ω**
 
@@ -93,7 +93,7 @@ Your formula should now look like this:
 
 ## Code
 
-To start up the opamp, simply include the library and call `OPAMP.begin(speed)`. As the optional `speed` argument to this function, can choose either `OPAMP_SPEED_LOWSPEED` as the low-speed (lower power) mode or `OPAMP_SPEED_HIGHSPEED` as the high-speed, high-power mode.
+To start up the opamp, simply include the library and call `OPAMP.begin(speed)`. As the optional `speed` argument to this function can choose either `OPAMP_SPEED_LOWSPEED` as the low-speed (lower power) mode or `OPAMP_SPEED_HIGHSPEED` as the high-speed, high-power mode.
 
 ```arduino
 #include <OPAMP.h>
@@ -104,4 +104,4 @@ void setup () {
 
 void loop() {}
 
-```
+```