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​ = 100 kΩVin​ = 0.8 VR1​ = 47 kΩI1​

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

Vin = 0.8 VR1 = 47 kΩRf = 100 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = ?Vin​R1​ = 2.2 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −10. The input resistor is R1 = 2.2 kΩ. Find the feedback resistor Rf.

Av = −10R1 = 2.2 kΩ
Rf = kΩ
3.Medium
−+Vout​Rf​ = 10 kΩR1​ = 2 kΩVin​ = 0.6 V

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

Vin = 0.6 VR1 = 2 kΩRf = 10 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 6.

R1 = 10 kΩAv = 6
Rf = kΩ
5.Hard
−+Vout​Rf​ = 100 kΩV1​ = 1.4 VR1​ = 100 kΩV2​ = 0.7 VR2​ = 10 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 = 1.4 VV2 = 0.7 VR1 = 100 kΩR2 = 10 kΩRf = 100 kΩ
If = mA
6.Hard
−+Vout​C = 2.2 µFVin​ = 1.9 VR = 100 kΩ

The integrator uses an ideal op-amp with ±15 V supplies; its output saturates at ±13 V. The capacitor is uncharged when a constant input Vin = 1.9 V is applied at t = 0. Find the output voltage Vout at t = 100 ms.

Vin = 1.9 VR = 100 kΩC = 2.2 µFVsat = ±13 Vt = 100 ms
Vout = V

Answer key

  1. 1. I1 = 0.01702 mA
  2. 2. Rf = 22 kΩ
  3. 3. Vout = 3.6 V
  4. 4. Rf = 50 kΩ
  5. 5. If = 0.084 mA
  6. 6. Vout = −0.8636 V

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