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​ = 22 kΩVin​ = −1.3 VR1​ = 10 kΩ

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

Vin = −1.3 VR1 = 10 kΩRf = 22 kΩ
Vout = V
2.Easy
−+Vout​Rf​ = 22 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The feedback resistor is Rf = 22 kΩ. Find the input resistor R1.

Av = −4Rf = 22 kΩ
R1 = kΩ
3.Medium
−+Vout​Rf​ = ?R1​ = 1 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 4.

R1 = 1 kΩAv = 4
Rf = kΩ
4.Medium
−+Vout​Rf​ = 10 kΩR1​ = 2 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±14 V. The non-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 = 2 kΩRf = 10 kΩVsat = ±14 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 2 kΩV1​ = 1.5 VR1​ = 2 kΩV2​ = 1 VR2​ = 47 kΩ

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

V1 = 1.5 VV2 = 1 VR1 = 2 kΩR2 = 47 kΩRf = 2 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 1.9 VR1​ = 47 kΩV2​ = 0.5 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 = 1.9 VV2 = 0.5 VR1 = 47 kΩR2 = 22 kΩRf = 4.7 kΩ
If = mA

Answer key

  1. 1. Vout = 2.86 V
  2. 2. R1 = 5.5 kΩ
  3. 3. Rf = 3 kΩ
  4. 4. Vin,max = 2.333 V
  5. 5. Vout = −1.543 V
  6. 6. If = 0.06315 mA

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