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​ = −1.8 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 = −1.8 VR1 = 1 kΩRf = 10 kΩVsat = ±14 V
Vout = V
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = −1.3 VR1​ = 47 kΩ

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

Vin = −1.3 VR1 = 47 kΩRf = 100 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 51.

R1 = 22 kΩAv = 51
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 10.

R1 = 10 kΩAv = 10
Rf = kΩ
5.Hard
−+Vout​C = 0.47 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. Find the output voltage Vout at t = 1 ms.

Vin = −2.1 VR = 1 kΩC = 0.47 µFVsat = ±14 Vt = 1 ms
Vout = V
6.Hard
−+Vout​Rf​ = 10 kΩV1​ = −0.9 VR1​ = 4.7 kΩV2​ = 0.1 VR2​ = 100 kΩ

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

V1 = −0.9 VV2 = 0.1 VR1 = 4.7 kΩR2 = 100 kΩRf = 10 kΩ
Vout = V

Answer key

  1. 1. Vout = 14 V
  2. 2. Vout = 2.766 V
  3. 3. Rf = 1100 kΩ
  4. 4. Rf = 90 kΩ
  5. 5. Vout = 4.468 V
  6. 6. Vout = 1.905 V

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