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​ = 10 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The feedback resistor is Rf = 10 kΩ. Find the input resistor R1.

Av = −4Rf = 10 kΩ
R1 = kΩ
2.Easy
−+Vout​Rf​ = 10 kΩVin​ = −1.2 VR1​ = 4.7 kΩ

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

Vin = −1.2 VR1 = 4.7 kΩRf = 10 kΩ
Vout = V
3.Medium
−+Vout​Rf​ = 100 kΩR1​ = 10 kΩVin​

The op-amp is ideal and runs from ±15 V supplies; its output saturates at ±12 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 = 10 kΩRf = 100 kΩVsat = ±12 V
Vin,max = V
4.Medium
−+Vout​Rf​ = ?R1​ = 47 kΩVin​

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

R1 = 47 kΩAv = 4
Rf = kΩ
5.Hard
−+Vout​Rf​ = 10 kΩV1​ = 0.1 VR1​ = 100 kΩV2​ = −2 VR2​ = 2 kΩ

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

V1 = 0.1 VV2 = −2 VR1 = 100 kΩR2 = 2 kΩRf = 10 kΩ
Vout = V
6.Hard
−+Vout​R2​ = 10 kΩV1​ = 1 VR1​ = 47 kΩV2​ = 1.1 VR3​ = 47 kΩR4​ = 47 kΩ

The op-amp is ideal and runs from ±15 V supplies. The resistor ratios are not matched. Find the output voltage Vout.

V1 = 1 VV2 = 1.1 VR1 = 47 kΩR2 = 10 kΩR3 = 47 kΩR4 = 47 kΩ
Vout = V

Answer key

  1. 1. R1 = 2.5 kΩ
  2. 2. Vout = 2.553 V
  3. 3. Vin,max = 1.091 V
  4. 4. Rf = 141 kΩ
  5. 5. Vout = 9.99 V
  6. 6. Vout = 0.4543 V

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