Op-amp circuits worksheet with answers

Free printable Op-amp circuits worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
−+Vout​Rf​ = 4.7 kΩVin​ = −0.4 VR1​ = 1 kΩ

The op-amp is ideal and runs from ±15 V supplies. Find the output voltage Vout.

Vin = −0.4 VR1 = 1 kΩRf = 4.7 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = 0.4 VR1​ = 1 kΩI1​

The op-amp is ideal and runs from ±15 V supplies. Find the current I1 through R₁, flowing towards the op-amp.

Vin = 0.4 VR1 = 1 kΩRf = 10 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 21.

R1 = 1 kΩAv = 21
Rf = kΩ
4.Medium
−+Vout​R2​ = 10 kΩV1​ = 2.4 VR1​ = 1 kΩV2​ = 1.1 VR3​ = 1 kΩR4​ = 10 kΩ

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R3 = R1 and R4 = R2. Find the voltage V− at the inverting input.

V1 = 2.4 VV2 = 1.1 VR1 = R3 = 1 kΩR2 = R4 = 10 kΩ
V− = V
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −0.7 VR1​ = 4.7 kΩV2​ = 1.7 VR2​ = 2 kΩ

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the output voltage Vout.

V1 = −0.7 VV2 = 1.7 VR1 = 4.7 kΩR2 = 2 kΩRf = 1 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 2 kΩV1​ = 0.3 VR1​ = 100 kΩV2​ = −1.4 VR2​ = 2 kΩIf​

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the current If through the feedback resistor, flowing towards the output.

V1 = 0.3 VV2 = −1.4 VR1 = 100 kΩR2 = 2 kΩRf = 2 kΩ
If = mA

Answer key

  1. 1. Vout = 1.88 V
  2. 2. I1 = 0.4 mA
  3. 3. Rf = 20 kΩ
  4. 4. V− = 1 V
  5. 5. Vout = −0.7011 V
  6. 6. If = −0.697 mA

Full step-by-step solutions: practise this topic on examproblems.com.