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​ = 22 kΩVin​ = 0.3 VR1​ = 4.7 kΩ

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

Vin = 0.3 VR1 = 4.7 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 47 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The feedback resistor is Rf = 47 kΩ. Find the input resistor R1.

Av = −4Rf = 47 kΩ
R1 = kΩ
3.Medium
−+Vout​R2​ = 47 kΩV1​ = 0.3 VR1​ = 100 kΩV2​ = 1.5 VR3​ = 100 kΩR4​ = 47 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 = 0.3 VV2 = 1.5 VR1 = R3 = 100 kΩR2 = R4 = 47 kΩ
V− = V
4.Medium
−+Vout​Rf​ = 4.7 kΩVin​R1​ = 2 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 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 = 4.7 kΩVsat = ±14 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = 1.9 VR1​ = 2 kΩV2​ = 0.7 VR2​ = 47 kΩ

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

V1 = 1.9 VV2 = 0.7 VR1 = 2 kΩR2 = 47 kΩRf = 1 kΩ
Vout = V
6.Hard
−+Vout​C = 0.47 µFVin​ = 1.9 VR = 1 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 = 1.9 V is applied at t = 0. Find the output voltage Vout at t = 0.5 ms.

Vin = 1.9 VR = 1 kΩC = 0.47 µFVsat = ±12 Vt = 0.5 ms
Vout = V

Answer key

  1. 1. Vout = −1.404 V
  2. 2. R1 = 11.75 kΩ
  3. 3. V− = 0.4796 V
  4. 4. Vin,max = 5.957 V
  5. 5. Vout = −0.9649 V
  6. 6. Vout = −2.021 V

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