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​ = 0.7 VR1​ = 4.7 kΩ

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

Vin = 0.7 VR1 = 4.7 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 100 kΩVin​ = −1.3 VR1​ = 22 kΩI1​

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

Vin = −1.3 VR1 = 22 kΩRf = 100 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 15.

R1 = 4.7 kΩAv = 15
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

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

R1 = 22 kΩAv = 10
Rf = kΩ
5.Hard
−+Vout​C = 0.22 µFVin​ = 2.8 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 = 2.8 V is applied at t = 0. How long after t = 0 does the output reach saturation? Find t.

Vin = 2.8 VR = 22 kΩC = 0.22 µFVsat = ±12 V
t = ms
6.Hard
−+Vout​R2​ = 22 kΩV1​ = −0.1 VR1​ = 10 kΩV2​ = 1.6 VR3​ = 1 kΩR4​ = 4.7 kΩ

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

V1 = −0.1 VV2 = 1.6 VR1 = 10 kΩR2 = 22 kΩR3 = 1 kΩR4 = 4.7 kΩ
Vout = V

Answer key

  1. 1. Vout = −7 V
  2. 2. I1 = −0.05909 mA
  3. 3. Rf = 65.8 kΩ
  4. 4. Rf = 198 kΩ
  5. 5. t = 20.74 ms
  6. 6. Vout = 4.442 V

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