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​ = 10 kΩ

An inverting amplifier with an ideal op-amp must have a voltage gain of −2.5. The input resistor is R1 = 10 kΩ. Find the feedback resistor Rf.

Av = −2.5R1 = 10 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 22 kΩVin​ = −1.5 VR1​ = 4.7 kΩ

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

Vin = −1.5 VR1 = 4.7 kΩRf = 22 kΩ
Vout = V
3.Medium
−+Vout​R2​ = 100 kΩV1​ = 0.6 VR1​ = 47 kΩV2​ = 1.5 VR3​ = 47 kΩR4​ = 100 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 = 0.6 VV2 = 1.5 VR1 = R3 = 47 kΩR2 = R4 = 100 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 25.

R1 = 10 kΩAv = 25
Rf = kΩ
5.Hard
−+Vout​Rf​ = 100 kΩV1​ = −1.1 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 = −1.1 VV2 = 0.6 VR1 = 47 kΩR2 = 10 kΩRf = 100 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 1 kΩV1​ = −0.8 VR1​ = 1 kΩV2​ = 0.4 VR2​ = 47 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 = −0.8 VV2 = 0.4 VR1 = 1 kΩR2 = 47 kΩRf = 1 kΩ
If = mA

Answer key

  1. 1. Rf = 25 kΩ
  2. 2. Vout = 7.021 V
  3. 3. Vout = 1.915 V
  4. 4. Rf = 240 kΩ
  5. 5. Vout = −3.66 V
  6. 6. If = −0.7915 mA

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