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​ = −1.9 VR1​ = 4.7 kΩ

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

Vin = −1.9 VR1 = 4.7 kΩRf = 10 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = −0.4 VR1​ = 10 kΩI1​

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

Vin = −0.4 VR1 = 10 kΩRf = 47 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 2 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 3.

R1 = 2 kΩAv = 3
Rf = kΩ
4.Medium
−+Vout​R2​ = 22 kΩV1​ = 0.4 VR1​ = 2 kΩV2​ = 0.9 VR3​ = 2 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 = 0.4 VV2 = 0.9 VR1 = R3 = 2 kΩR2 = R4 = 22 kΩ
Vout = V
5.Hard
−+Vout​Rf​ = 47 kΩV1​ = −1.4 VR1​ = 47 kΩV2​ = −0.6 VR2​ = 10 kΩ

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

V1 = −1.4 VV2 = −0.6 VR1 = 47 kΩR2 = 10 kΩRf = 47 kΩ
Vout = V
6.Hard
−+Vout​R2​ = 100 kΩV1​ = −0.1 VR1​ = 10 kΩV2​ = −0.9 VR3​ = 47 kΩR4​ = 47 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 = −0.9 VR1 = 10 kΩR2 = 100 kΩR3 = 47 kΩR4 = 47 kΩ
Vout = V

Answer key

  1. 1. Vout = 4.043 V
  2. 2. I1 = −0.04 mA
  3. 3. Rf = 4 kΩ
  4. 4. Vout = 5.5 V
  5. 5. Vout = 4.22 V
  6. 6. Vout = −3.95 V

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