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​ = 0.8 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 = 0.8 VR1 = 4.7 kΩRf = 10 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 47 kΩVin​R1​ = ?

An inverting amplifier with an ideal op-amp must have a voltage gain of −4. The feedback resistor is Rf = 47 kΩ. Find the input resistor R1.

Av = −4Rf = 47 kΩ
R1 = kΩ
3.Medium
−+Vout​Rf​ = 22 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 = 22 kΩVsat = ±12 V
Vin,max = V
4.Medium
−+Vout​Rf​ = 100 kΩR1​ = 2 kΩVin​ = −0.5 VRa​ = 10 kΩRb​ = 4.7 kΩ

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

Vin = −0.5 VRa = 10 kΩRb = 4.7 kΩR1 = 2 kΩRf = 100 kΩ
Vout = V
5.Hard
−+Vout​Rf​ = 1 kΩV1​ = −0.5 VR1​ = 1 kΩV2​ = 1.6 VR2​ = 2 kΩ

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

V1 = −0.5 VV2 = 1.6 VR1 = 1 kΩR2 = 2 kΩRf = 1 kΩ
Vout = V
6.Hard
−+Vout​R2​ = 4.7 kΩV1​ = 1.9 VR1​ = 4.7 kΩV2​ = −0.4 VR3​ = 22 kΩR4​ = 4.7 kΩ

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

V1 = 1.9 VV2 = −0.4 VR1 = 4.7 kΩR2 = 4.7 kΩR3 = 22 kΩR4 = 4.7 kΩ
Vout = V

Answer key

  1. 1. I1 = 0.1702 mA
  2. 2. R1 = 11.75 kΩ
  3. 3. Vin,max = 3.75 V
  4. 4. Vout = −8.153 V
  5. 5. Vout = −0.3 V
  6. 6. Vout = −2.041 V

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