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​ = 100 kΩVin​ = −1.4 VR1​ = 47 kΩI1​

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

Vin = −1.4 VR1 = 47 kΩRf = 100 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = −1.4 VR1​ = 47 kΩ

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

Vin = −1.4 VR1 = 47 kΩRf = 100 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 6.

R1 = 1 kΩAv = 6
Rf = kΩ
4.Medium
−+Vout​R2​ = 10 kΩV1​ = −2.8 VR1​ = 4.7 kΩV2​ = 2.7 VR3​ = 4.7 kΩR4​ = 10 kΩ

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

V1 = −2.8 VV2 = 2.7 VR1 = R3 = 4.7 kΩR2 = R4 = 10 kΩ
Vout = V
5.Hard
−+Vout​Rf​ = 22 kΩV1​ = 1.4 VR1​ = 47 kΩV2​ = −1.4 VR2​ = 10 kΩ

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

V1 = 1.4 VV2 = −1.4 VR1 = 47 kΩR2 = 10 kΩRf = 22 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 1 kΩRf1​ = 4.7 kΩstage 2: non-invertingR2​ = 47 kΩRf2​ = 47 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 = 1 kΩRf1 = 4.7 kΩR2 = 47 kΩRf2 = 47 kΩ
Av =

Answer key

  1. 1. I1 = −0.02979 mA
  2. 2. Vout = 2.979 V
  3. 3. Rf = 5 kΩ
  4. 4. Vout = 11.7 V
  5. 5. Vout = 2.425 V
  6. 6. Av = −9.4

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