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​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −20. The feedback resistor is Rf = 10 kΩ. Find the input resistor R1.

Av = −20Rf = 10 kΩ
R1 = kΩ
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = −1.2 VR1​ = 2 kΩ

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

Vin = −1.2 VR1 = 2 kΩRf = 10 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = 22 kΩVin​R1​ = 1 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 = 1 kΩRf = 22 kΩVsat = ±14 V
Vin,max = V
4.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 8.

R1 = 4.7 kΩAv = 8
Rf = kΩ
5.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = −1 VR1​ = 22 kΩV2​ = −1.7 VR2​ = 10 kΩ

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

V1 = −1 VV2 = −1.7 VR1 = 22 kΩR2 = 10 kΩRf = 4.7 kΩ
Vout = V
6.Hard
−+Vout​C = 0.22 µFVin​ = −2.5 VR = 10 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 = −2.5 V is applied at t = 0. Find the output voltage Vout at t = 2 ms.

Vin = −2.5 VR = 10 kΩC = 0.22 µFVsat = ±12 Vt = 2 ms
Vout = V

Answer key

  1. 1. R1 = 0.5 kΩ
  2. 2. Vout = 6 V
  3. 3. Vin,max = 0.6364 V
  4. 4. Rf = 32.9 kΩ
  5. 5. Vout = 1.013 V
  6. 6. Vout = 2.273 V

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