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​ = 47 kΩVin​ = 1.2 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 = 1.2 VR1 = 4.7 kΩRf = 47 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 47 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −10. The feedback resistor is Rf = 47 kΩ. Find the input resistor R1.

Av = −10Rf = 47 kΩ
R1 = kΩ
3.Medium
−+Vout​Rf​ = 47 kΩVin​R1​ = 10 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 10 kΩRf = 47 kΩVsat = ±12 V
Vin,max = V
4.Medium
−+Vout​Rf​ = 100 kΩVin​R1​ = 4.7 kΩ

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±13 V. The inverting amplifier is driven by a sine wave. Find the largest input amplitude Vin,max (peak value) for which the output does not clip.

R1 = 4.7 kΩRf = 100 kΩVsat = ±13 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 0.7 VR1​ = 4.7 kΩV2​ = 0.4 VR2​ = 22 kΩ

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

V1 = 0.7 VV2 = 0.4 VR1 = 4.7 kΩR2 = 22 kΩRf = 4.7 kΩ
Vout = V
6.Hard
Vin​V1​Vout​stage 1: invertingR1​ = 4.7 kΩRf1​ = 10 kΩstage 2: non-invertingR2​ = 22 kΩRf2​ = 4.7 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. Find the overall voltage gain Av = Vout/Vin.

R1 = 4.7 kΩRf1 = 10 kΩR2 = 22 kΩRf2 = 4.7 kΩ
Av =

Answer key

  1. 1. I1 = 0.2553 mA
  2. 2. R1 = 4.7 kΩ
  3. 3. Vin,max = 2.553 V
  4. 4. Vin,max = 0.611 V
  5. 5. Vout = −0.7855 V
  6. 6. Av = −2.582

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