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​ = 0.2 VR1​ = 1 kΩ

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

Vin = 0.2 VR1 = 1 kΩRf = 4.7 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 100 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −2. The feedback resistor is Rf = 100 kΩ. Find the input resistor R1.

Av = −2Rf = 100 kΩ
R1 = kΩ
3.Medium
−+Vout​Rf​ = 4.7 kΩR1​ = 2 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 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 = 4.7 kΩVsat = ±14 V
Vin,max = V
4.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 4.

R1 = 22 kΩAv = 4
Rf = kΩ
5.Hard
−+Vout​Rf​ = 10 kΩV1​ = 1.2 VR1​ = 10 kΩV2​ = 1.2 VR2​ = 100 kΩ

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

V1 = 1.2 VV2 = 1.2 VR1 = 10 kΩR2 = 100 kΩRf = 10 kΩ
Vout = V
6.Hard
−+Vout​C = 0.1 µFVin​ = 2.4 VR = 1 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 = 2.4 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = 2.4 VR = 1 kΩC = 0.1 µFVsat = ±13 V
t = ms

Answer key

  1. 1. Vout = −0.94 V
  2. 2. R1 = 50 kΩ
  3. 3. Vin,max = 4.179 V
  4. 4. Rf = 66 kΩ
  5. 5. Vout = −1.32 V
  6. 6. t = 0.5417 ms

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