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​ = −0.1 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 = −0.1 VR1 = 4.7 kΩRf = 47 kΩ
I1 = mA
2.Easy
−+Vout​Rf​ = 47 kΩVin​ = 0.3 VR1​ = 22 kΩ

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

Vin = 0.3 VR1 = 22 kΩRf = 47 kΩ
Vout = V
3.Medium
−+Vout​R2​ = 2 kΩV1​ = −1.9 VR1​ = 22 kΩV2​ = 1.8 VR3​ = 22 kΩR4​ = 2 kΩ

The difference amplifier uses an ideal op-amp with ±15 V supplies, with R3 = R1 and R4 = R2. Find the voltage V− at the inverting input.

V1 = −1.9 VV2 = 1.8 VR1 = R3 = 22 kΩR2 = R4 = 2 kΩ
V− = V
4.Medium
−+Vout​Rf​ = 100 kΩR1​ = 2 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 = 2 kΩRf = 100 kΩVsat = ±12 V
Vin,max = V
5.Hard
−+Vout​Rf​ = 10 kΩV1​ = 0.8 VR1​ = 47 kΩV2​ = 1.6 VR2​ = 22 kΩ

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

V1 = 0.8 VV2 = 1.6 VR1 = 47 kΩR2 = 22 kΩRf = 10 kΩ
Vout = V
6.Hard
−+Vout​R2​ = 100 kΩV1​ = 1.2 VR1​ = 100 kΩV2​ = 0.4 VR3​ = 4.7 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 = 1.2 VV2 = 0.4 VR1 = 100 kΩR2 = 100 kΩR3 = 4.7 kΩR4 = 47 kΩ
Vout = V

Answer key

  1. 1. I1 = −0.02128 mA
  2. 2. Vout = −0.6409 V
  3. 3. V− = 0.15 V
  4. 4. Vin,max = 0.2353 V
  5. 5. Vout = −0.8975 V
  6. 6. Vout = −0.4727 V

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