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​ = 100 kΩVin​ = 0.4 VR1​ = 1 kΩ

The circuit is an inverting amplifier. The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. Find the output voltage Vout.

Vin = 0.4 VR1 = 1 kΩRf = 100 kΩVsat = ±13 V
Vout = V
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = −0.8 VR1​ = 2 kΩ

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

Vin = −0.8 VR1 = 2 kΩRf = 10 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = ?R1​ = 2 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 8.

R1 = 2 kΩAv = 8
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 5.

R1 = 1 kΩAv = 5
Rf = kΩ
5.Hard
−+Vout​Rf​ = 10 kΩV1​ = −1.5 VR1​ = 100 kΩV2​ = 0.8 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 = −1.5 VV2 = 0.8 VR1 = 100 kΩR2 = 22 kΩRf = 10 kΩ
If = mA
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 1 kΩRf1​ = 4.7 kΩstage 2: non-invertingR2​ = 4.7 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 = 0.85 V. Find the output voltage Vout.

R1 = 1 kΩRf1 = 4.7 kΩR2 = 4.7 kΩRf2 = 10 kΩVin = 0.85 V
Vout = V

Answer key

  1. 1. Vout = −13 V
  2. 2. Vout = 4 V
  3. 3. Rf = 14 kΩ
  4. 4. Rf = 4 kΩ
  5. 5. If = 0.02136 mA
  6. 6. Vout = −12.5 V

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