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​ = ?Vin​R1​ = 2.2 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −5. The input resistor is R1 = 2.2 kΩ. Find the feedback resistor Rf.

Av = −5R1 = 2.2 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = 1.1 VR1​ = 1 kΩI1​

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

Vin = 1.1 VR1 = 1 kΩRf = 10 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = 47 kΩR1​ = 4.7 kΩVin​ = 2 VRa​ = 22 kΩRb​ = 22 kΩ

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

Vin = 2 VRa = 22 kΩRb = 22 kΩR1 = 4.7 kΩRf = 47 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 100 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 5.

R1 = 100 kΩAv = 5
Rf = kΩ
5.Hard
−+Vout​R2​ = 10 kΩV1​ = 1.5 VR1​ = 47 kΩV2​ = 0.9 VR3​ = 1 kΩR4​ = 1 kΩ

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage Vout.

V1 = 1.5 VV2 = 0.9 VR1 = 47 kΩR2 = 10 kΩR3 = 1 kΩR4 = 1 kΩ
Vout = V
6.Hard
−+Vout​C = 1 µFVin​ = 0.8 VR = 2.2 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 = 0.8 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = 0.8 VR = 2.2 kΩC = 1 µFVsat = ±14 V
t = ms

Answer key

  1. 1. Rf = 11 kΩ
  2. 2. I1 = 1.1 mA
  3. 3. Vout = 11 V
  4. 4. Rf = 400 kΩ
  5. 5. Vout = 0.2266 V
  6. 6. t = 38.5 ms

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