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​ = 1.5 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 = 1.5 VR1 = 2 kΩRf = 10 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = 1.5 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 V. Find the output voltage Vout.

Vin = 1.5 VR1 = 1 kΩRf = 100 kΩVsat = ±14 V
Vout = V
3.Medium
−+Vout​Rf​ = 100 kΩR1​ = 4.7 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. The non-inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 4.7 kΩRf = 100 kΩVsat = ±13 V
Vin,max = V
4.Medium
−+Vout​R2​ = 10 kΩV1​ = −1.3 VR1​ = 100 kΩV2​ = 2.9 VR3​ = 100 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 = −1.3 VV2 = 2.9 VR1 = R3 = 100 kΩR2 = R4 = 10 kΩ
Vout = V
5.Hard
−+Vout​C = 1 µFVin​ = 0.2 VR = 4.7 kΩ

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±12 V. The capacitor is uncharged when a constant input Vin = 0.2 V is applied at t = 0. Find the output voltage Vout at t = 50 ms.

Vin = 0.2 VR = 4.7 kΩC = 1 µFVsat = ±12 Vt = 50 ms
Vout = V
6.Hard
−+Vout​Rf​ = 10 kΩV1​ = −0.5 VR1​ = 1 kΩV2​ = 0.7 VR2​ = 47 kΩ

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

V1 = −0.5 VV2 = 0.7 VR1 = 1 kΩR2 = 47 kΩRf = 10 kΩ
Vout = V

Answer key

  1. 1. I1 = 0.75 mA
  2. 2. Vout = −14 V
  3. 3. Vin,max = 0.5836 V
  4. 4. Vout = 0.42 V
  5. 5. Vout = −2.128 V
  6. 6. Vout = 4.851 V

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