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​ = −0.1 VR1​ = 1 kΩ

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

Vin = −0.1 VR1 = 1 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 22 kΩVin​ = 0.9 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. Find the output voltage Vout.

Vin = 0.9 VR1 = 1 kΩRf = 22 kΩVsat = ±12 V
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 25.

R1 = 10 kΩAv = 25
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 31.

R1 = 22 kΩAv = 31
Rf = kΩ
5.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 22 kΩRf1​ = 47 kΩstage 2: non-invertingR2​ = 2 kΩRf2​ = 2 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 = 22 kΩRf1 = 47 kΩR2 = 2 kΩRf2 = 2 kΩ
Av =
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = −1.8 VR1​ = 2 kΩV2​ = 0.1 VR2​ = 1 kΩ

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

V1 = −1.8 VV2 = 0.1 VR1 = 2 kΩR2 = 1 kΩRf = 4.7 kΩ
Vout = V

Answer key

  1. 1. Vout = 4.7 V
  2. 2. Vout = −12 V
  3. 3. Rf = 240 kΩ
  4. 4. Rf = 660 kΩ
  5. 5. Av = −4.273
  6. 6. Vout = 3.76 V

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