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​ = 10 kΩVin​ = −1.7 VR1​ = 2 kΩ

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

Vin = −1.7 VR1 = 2 kΩRf = 10 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = 0.2 VR1​ = 4.7 kΩI1​

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

Vin = 0.2 VR1 = 4.7 kΩRf = 10 kΩ
I1 = mA
3.Medium
−+Vout​R2​ = 22 kΩV1​ = 0.5 VR1​ = 100 kΩV2​ = 1.8 VR3​ = 100 kΩR4​ = 22 kΩ

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R3 = R1 and R4 = R2. Find the output voltage Vout.

V1 = 0.5 VV2 = 1.8 VR1 = R3 = 100 kΩR2 = R4 = 22 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 11.

R1 = 100 kΩAv = 11
Rf = kΩ
5.Hard
−+Vout​R2​ = 4.7 kΩV1​ = 0.9 VR1​ = 100 kΩV2​ = 1.7 VR3​ = 2 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 = 0.9 VV2 = 1.7 VR1 = 100 kΩR2 = 4.7 kΩR3 = 2 kΩR4 = 1 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 22 kΩV1​ = −1.4 VR1​ = 4.7 kΩV2​ = 0.7 VR2​ = 22 kΩ

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

V1 = −1.4 VV2 = 0.7 VR1 = 4.7 kΩR2 = 22 kΩRf = 22 kΩ
Vout = V

Answer key

  1. 1. Vout = 8.5 V
  2. 2. I1 = 0.04255 mA
  3. 3. Vout = 0.286 V
  4. 4. Rf = 1000 kΩ
  5. 5. Vout = 0.551 V
  6. 6. Vout = 5.853 V

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