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​ = 47 kΩVin​ = 0.5 VR1​ = 10 kΩ

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

Vin = 0.5 VR1 = 10 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 22 kΩVin​ = −0.3 VR1​ = 2 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. Find the output voltage Vout.

Vin = −0.3 VR1 = 2 kΩRf = 22 kΩVsat = ±13 V
Vout = V
3.Medium
−+Vout​R2​ = 47 kΩV1​ = −0.4 VR1​ = 10 kΩV2​ = 1.7 VR3​ = 10 kΩR4​ = 47 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 = −0.4 VV2 = 1.7 VR1 = R3 = 10 kΩR2 = R4 = 47 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 2.

R1 = 10 kΩAv = 2
Rf = kΩ
5.Hard
−+Vout​C = 2.2 µFVin​ = 2.3 VR = 47 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 = 2.3 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = 2.3 VR = 47 kΩC = 2.2 µFVsat = ±12 V
t = ms
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 1.9 VR1​ = 100 kΩV2​ = 1.5 VR2​ = 1 kΩ

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

V1 = 1.9 VV2 = 1.5 VR1 = 100 kΩR2 = 1 kΩRf = 4.7 kΩ
Vout = V

Answer key

  1. 1. Vout = −2.35 V
  2. 2. Vout = 3.3 V
  3. 3. Vout = 9.87 V
  4. 4. Rf = 10 kΩ
  5. 5. t = 539.5 ms
  6. 6. Vout = −7.139 V

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