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. The input resistor is R1 = 10 kΩ. Find the feedback resistor Rf.

Av = −2R1 = 10 kΩ
Rf = kΩ
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = 0.1 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 = 0.1 VR1 = 10 kΩRf = 47 kΩ
I1 = mA
3.Medium
−+Vout​Rf​ = 2 kΩR1​ = 2 kΩVin​ = 0.9 V

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

Vin = 0.9 VR1 = 2 kΩRf = 2 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 10.

R1 = 1 kΩAv = 10
Rf = kΩ
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −2 VR1​ = 2 kΩV2​ = −1 VR2​ = 22 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 = −2 VV2 = −1 VR1 = 2 kΩR2 = 22 kΩRf = 1 kΩ
If = mA
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 10 kΩRf1​ = 22 kΩstage 2: non-invertingR2​ = 47 kΩRf2​ = 10 kΩ

Two ideal op-amp stages are connected in cascade: an inverting amplifier (R1, Rf1) followed by a non-inverting amplifier (R2 to ground, Rf2 in the feedback). Both run from ±15 V supplies. The input is Vin = 0.7 V. Find the output voltage Vout.

R1 = 10 kΩRf1 = 22 kΩR2 = 47 kΩRf2 = 10 kΩVin = 0.7 V
Vout = V

Answer key

  1. 1. Rf = 20 kΩ
  2. 2. I1 = 0.01 mA
  3. 3. Vout = 1.8 V
  4. 4. Rf = 9 kΩ
  5. 5. If = −1.045 mA
  6. 6. Vout = −1.868 V

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