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​ = −1 VR1​ = 10 kΩ

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

Vin = −1 VR1 = 10 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = −0.3 VR1​ = 4.7 kΩI1​

The op-amp is ideal and runs from ±15 V supplies. Find the current I1 through R₁, flowing towards the op-amp.

Vin = −0.3 VR1 = 4.7 kΩRf = 100 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 11.

R1 = 10 kΩAv = 11
Rf = kΩ
4.Medium
−+Vout​Rf​ = 100 kΩR1​ = 10 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 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 = 10 kΩRf = 100 kΩVsat = ±12 V
Vin,max = V
5.Hard
−+Vout​C = 0.47 µFVin​ = 1.8 VR = 100 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 = 1.8 V is applied at t = 0. Find the output voltage Vout at t = 20 ms.

Vin = 1.8 VR = 100 kΩC = 0.47 µFVsat = ±12 Vt = 20 ms
Vout = V
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 0.4 VR1​ = 47 kΩV2​ = −1.8 VR2​ = 4.7 kΩ

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

V1 = 0.4 VV2 = −1.8 VR1 = 47 kΩR2 = 4.7 kΩRf = 4.7 kΩ
Vout = V

Answer key

  1. 1. Vout = 2.2 V
  2. 2. I1 = −0.06383 mA
  3. 3. Rf = 100 kΩ
  4. 4. Vin,max = 1.091 V
  5. 5. Vout = −0.766 V
  6. 6. Vout = 1.76 V

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