Analog Electronics Lab #5

DC Blocking, Current Limiting Circuit

Why is adding a resistor and a capacitor on the inputs and outputs of your circuit a good idea?

Adding a capacitor and resistor on the inputs and outputs of the circuit can help to block dangerous DC voltage from inadvertently damaging sensitive headphone or headphone jacks. Overall, adding them is a good safety precaution.

Non-Inverting Amplifier

Short Video:

Calculations:

Vout= Vin X (1+ R2/R1)
0.2V= 0.1V X (1 + R2/10K Ohms)
2= (1+ R2/10K Ohms)
1= R2/10k Ohms
R2= 10K Ohms

Non-Inverting Amplifier with Potentiometer:

Video:

Calculations:
Gain = Vin * (1 + R2/R1)
0.2V= 0.1V X (1 + R2/10K Ohms)
2= (1+R2/10K)
1= R2/10K
R2= 10K Ohms

Gain = Vin * (1 + R2/R1)
0.1V= 0.1V X (1+ R2/10K Ohms)
1= (1 + R2/10K Ohms)
0= R2/10K Ohms
R2= 0 Ohms

Inverting Amplifier:

How is the inverting amplifier different from the non-inverting amplifier?

As we can see from comparing the two videos, in a non-inverting amplifier, the input and output signals are both perfectly aligned and in-phase. However, in an inverting amplifier, the input and output are both clearly out of phase. After some research, I found that in an inverting amplifier, the input and output signals are 180 degrees out of phase with each other.

Short Video:

Calculations:
Gain = -Vin*(Rf/Rin) 
0.2V= 0.1V X (Rf/10k Ohms)2= Rf/10k Ohms
20k Ohms= Rf

Troubleshooting Log:

Made some mistakes this week. Check them out here!