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.

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1.Easy
−+Vout​Rf​ = 47 kΩVin​ = 1.5 VR1​ = 2 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. Find the output voltage Vout.

Vin = 1.5 VR1 = 2 kΩRf = 47 kΩVsat = ±13 V
Vout = V
2.Easy
−+Vout​Rf​ = ?Vin​R1​ = 22 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −2.5. The input resistor is R1 = 22 kΩ. Find the feedback resistor Rf.

Av = −2.5R1 = 22 kΩ
Rf = kΩ
3.Medium
−+Vout​Rf​ = 2 kΩR1​ = 1 kΩVin​ = 0.1 V

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

Vin = 0.1 VR1 = 1 kΩRf = 2 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 100 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 15.

R1 = 100 kΩAv = 15
Rf = kΩ
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 10 kΩRf1​ = 10 kΩstage 2: non-invertingR2​ = 2 kΩRf2​ = 22 kΩ

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R1, Rf1) followed by a non-inverting amplifier (R2 to ground, Rf2 in the feedback). Both run from ±15 V supplies. Find the overall voltage gain Av = Vout/Vin.

R1 = 10 kΩRf1 = 10 kΩR2 = 2 kΩRf2 = 22 kΩ
Av =
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 4.7 kΩRf1​ = 47 kΩstage 2: non-invertingR2​ = 22 kΩRf2​ = 10 kΩ

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R1, Rf1) followed by a non-inverting amplifier (R2 to ground, Rf2 in the feedback). Both run from ±15 V supplies. The input is Vin = −0.85 V. Find the output voltage Vout.

R1 = 4.7 kΩRf1 = 47 kΩR2 = 22 kΩRf2 = 10 kΩVin = −0.85 V
Vout = V

Answer key

  1. 1. Vout = −13 V
  2. 2. Rf = 55 kΩ
  3. 3. Vout = 0.3 V
  4. 4. Rf = 1400 kΩ
  5. 5. Av = −12
  6. 6. Vout = 12.36 V

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