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​ = 10 kΩVin​ = −0.1 VR1​ = 2 kΩI1​

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

Vin = −0.1 VR1 = 2 kΩRf = 10 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = −0.8 VR1​ = 1 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 = −0.8 VR1 = 1 kΩRf = 47 kΩVsat = ±13 V
Vout = V
3.Medium
−+Vout​R2​ = 4.7 kΩV1​ = −0.7 VR1​ = 1 kΩV2​ = −1.3 VR3​ = 1 kΩR4​ = 4.7 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 = −0.7 VV2 = −1.3 VR1 = R3 = 1 kΩR2 = R4 = 4.7 kΩ
Vout = V
4.Medium
−+Vout​R2​ = 4.7 kΩV1​ = −0.8 VR1​ = 22 kΩV2​ = 1.4 VR3​ = 22 kΩR4​ = 4.7 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 = −0.8 VV2 = 1.4 VR1 = R3 = 22 kΩR2 = R4 = 4.7 kΩ
V− = V
5.Hard
−+Vout​R2​ = 10 kΩV1​ = −0.2 VR1​ = 1 kΩV2​ = 1.8 VR3​ = 47 kΩR4​ = 22 kΩ

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage Vout.

V1 = −0.2 VV2 = 1.8 VR1 = 1 kΩR2 = 10 kΩR3 = 47 kΩR4 = 22 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 1 kΩRf1​ = 22 kΩstage 2: non-invertingR2​ = 100 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 = 0.5 V. Find the output voltage Vout.

R1 = 1 kΩRf1 = 22 kΩR2 = 100 kΩRf2 = 10 kΩVin = 0.5 V
Vout = V

Answer key

  1. 1. I1 = −0.05 mA
  2. 2. Vout = 13 V
  3. 3. Vout = −2.82 V
  4. 4. V− = 0.2464 V
  5. 5. Vout = 8.313 V
  6. 6. Vout = −12.1 V

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