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​ = 47 kΩVin​ = 1.7 VR1​ = 10 kΩ

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

Vin = 1.7 VR1 = 10 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 4.7 kΩVin​ = −0.6 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 = −0.6 VR1 = 2 kΩRf = 4.7 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = 10 kΩR1​ = 2 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 = 2 kΩRf = 10 kΩVsat = ±13 V
Vin,max = V
4.Medium
−+Vout​R2​ = 22 kΩV1​ = −0.4 VR1​ = 10 kΩV2​ = −0.2 VR3​ = 10 kΩR4​ = 22 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 = −0.4 VV2 = −0.2 VR1 = R3 = 10 kΩR2 = R4 = 22 kΩ
Vout = V
5.Hard
−+Vout​C = 0.1 µFVin​ = 0.4 VR = 10 kΩ

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±13 V. The capacitor is uncharged when a constant input Vin = 0.4 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = 0.4 VR = 10 kΩC = 0.1 µFVsat = ±13 V
t = ms
6.Hard
−+Vout​C = 2.2 µFVin​ = −2.1 VR = 1 kΩ

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±14 V. The capacitor is uncharged when a constant input Vin = −2.1 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = −2.1 VR = 1 kΩC = 2.2 µFVsat = ±14 V
t = ms

Answer key

  1. 1. Vout = −7.99 V
  2. 2. I1 = −0.3 mA
  3. 3. Vin,max = 2.167 V
  4. 4. Vout = 0.44 V
  5. 5. t = 32.5 ms
  6. 6. t = 14.67 ms

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