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​ = 1.5 VR1​ = 10 kΩI1​

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

Vin = 1.5 VR1 = 10 kΩRf = 22 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 2 kΩVin​ = −1.5 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 V. Find the output voltage Vout.

Vin = −1.5 VR1 = 1 kΩRf = 2 kΩVsat = ±14 V
Vout = V
3.Medium
−+Vout​Rf​ = 10 kΩR1​ = 2 kΩVin​ = 1.5 V

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

Vin = 1.5 VR1 = 2 kΩRf = 10 kΩ
Vout = V
4.Medium
−+Vout​R2​ = 10 kΩV1​ = 0.6 VR1​ = 2 kΩV2​ = 2.1 VR3​ = 2 kΩR4​ = 10 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 = 0.6 VV2 = 2.1 VR1 = R3 = 2 kΩR2 = R4 = 10 kΩ
Vout = V
5.Hard
−+Vout​Rf​ = 10 kΩV1​ = 0.2 VR1​ = 10 kΩV2​ = 0.3 VR2​ = 22 kΩIf​

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the current If through the feedback resistor, flowing towards the output.

V1 = 0.2 VV2 = 0.3 VR1 = 10 kΩR2 = 22 kΩRf = 10 kΩ
If = mA
6.Hard
−+Vout​C = 0.47 µFVin​ = 2.2 VR = 22 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 = 2.2 V is applied at t = 0. Find the output voltage Vout at t = 20 ms.

Vin = 2.2 VR = 22 kΩC = 0.47 µFVsat = ±12 Vt = 20 ms
Vout = V

Answer key

  1. 1. I1 = 0.15 mA
  2. 2. Vout = 3 V
  3. 3. Vout = 9 V
  4. 4. Vout = 7.5 V
  5. 5. If = 0.03364 mA
  6. 6. Vout = −4.255 V

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