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​ = 22 kΩVin​ = −0.2 VR1​ = 2 kΩ

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

Vin = −0.2 VR1 = 2 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = ?Vin​R1​ = 22 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The input resistor is R1 = 22 kΩ. Find the feedback resistor Rf.

Av = −4R1 = 22 kΩ
Rf = kΩ
3.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 21.

R1 = 4.7 kΩAv = 21
Rf = kΩ
4.Medium
−+Vout​Rf​ = 22 kΩVin​R1​ = 4.7 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 4.7 kΩRf = 22 kΩVsat = ±13 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 2 kΩV1​ = 0.2 VR1​ = 2 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 = 0.2 VV2 = 0.7 VR1 = 2 kΩR2 = 10 kΩRf = 2 kΩ
If = mA
6.Hard
−+Vout​Rf​ = 2 kΩV1​ = −1.9 VR1​ = 1 kΩV2​ = 1.9 VR2​ = 100 kΩ

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

V1 = −1.9 VV2 = 1.9 VR1 = 1 kΩR2 = 100 kΩRf = 2 kΩ
Vout = V

Answer key

  1. 1. Vout = 2.2 V
  2. 2. Rf = 88 kΩ
  3. 3. Rf = 94 kΩ
  4. 4. Vin,max = 2.777 V
  5. 5. If = 0.17 mA
  6. 6. Vout = 3.762 V

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