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​ = 4.7 kΩVin​ = 1.9 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 = 1.9 VR1 = 2 kΩRf = 4.7 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = ?Vin​R1​ = 10 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −2.5. The input resistor is R1 = 10 kΩ. Find the feedback resistor Rf.

Av = −2.5R1 = 10 kΩ
Rf = kΩ
3.Medium
−+Vout​R2​ = 4.7 kΩV1​ = −3 VR1​ = 2 kΩV2​ = 0.5 VR3​ = 2 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 = −3 VV2 = 0.5 VR1 = R3 = 2 kΩR2 = R4 = 4.7 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = 47 kΩVin​R1​ = 2 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. The 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 = 2 kΩRf = 47 kΩVsat = ±12 V
Vin,max = V
5.Hard
−+Vout​C = 4.7 µFVin​ = −0.7 VR = 47 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 = −0.7 V is applied at t = 0. Find the output voltage Vout at t = 200 ms.

Vin = −0.7 VR = 47 kΩC = 4.7 µFVsat = ±12 Vt = 200 ms
Vout = V
6.Hard
−+Vout​Rf​ = 10 kΩV1​ = 1.5 VR1​ = 47 kΩV2​ = 1.4 VR2​ = 4.7 kΩ

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

V1 = 1.5 VV2 = 1.4 VR1 = 47 kΩR2 = 4.7 kΩRf = 10 kΩ
Vout = V

Answer key

  1. 1. I1 = 0.95 mA
  2. 2. Rf = 25 kΩ
  3. 3. Vout = 8.225 V
  4. 4. Vin,max = 0.5106 V
  5. 5. Vout = 0.6338 V
  6. 6. Vout = −3.298 V

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