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​ = 22 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −20. The input resistor is R1 = 22 kΩ. Find the feedback resistor Rf.

Av = −20R1 = 22 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = −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 VR1 = 1 kΩRf = 10 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = 47 kΩR1​ = 22 kΩVin​ = 2 VRa​ = 2 kΩRb​ = 1 kΩ

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

Vin = 2 VRa = 2 kΩRb = 1 kΩR1 = 22 kΩRf = 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 51.

R1 = 10 kΩAv = 51
Rf = kΩ
5.Hard
−+Vout​R2​ = 4.7 kΩV1​ = 0.2 VR1​ = 2 kΩV2​ = 1.8 VR3​ = 2 kΩR4​ = 10 kΩ

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

V1 = 0.2 VV2 = 1.8 VR1 = 2 kΩR2 = 4.7 kΩR3 = 2 kΩR4 = 10 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 47 kΩV1​ = −0.7 VR1​ = 47 kΩV2​ = 0.1 VR2​ = 100 kΩ

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

V1 = −0.7 VV2 = 0.1 VR1 = 47 kΩR2 = 100 kΩRf = 47 kΩ
Vout = V

Answer key

  1. 1. Rf = 440 kΩ
  2. 2. I1 = −1 mA
  3. 3. Vout = 2.091 V
  4. 4. Rf = 500 kΩ
  5. 5. Vout = 4.555 V
  6. 6. Vout = 0.653 V

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