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​ = 10 kΩ

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

Vin = −0.1 VR1 = 10 kΩRf = 47 kΩ
Vout = V
2.Easy
−+Vout​8.5 VRs​ = 2.2 kΩRL​10 kΩ

A sensor behaves like an 8.5 V source with an internal resistance Rs = 2.2 kΩ. It feeds a load RL = 10 kΩ through an ideal voltage follower (unity-gain buffer). For comparison, find the load voltage VL if the load were connected directly to the sensor without the buffer.

Vs = 8.5 VRs = 2.2 kΩRL = 10 kΩ
VL = V
3.Medium
−+Vout​Rf​ = ?R1​ = 4.7 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 10.

R1 = 4.7 kΩAv = 10
Rf = kΩ
4.Medium
−+Vout​Rf​ = ?R1​ = 22 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 2.

R1 = 22 kΩAv = 2
Rf = kΩ
5.Hard
−+Vout​Rf​ = 22 kΩV1​ = 0.3 VR1​ = 2 kΩV2​ = 0.1 VR2​ = 22 kΩ

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

V1 = 0.3 VV2 = 0.1 VR1 = 2 kΩR2 = 22 kΩRf = 22 kΩ
Vout = V
6.Hard
−+Vout​R2​ = 22 kΩV1​ = −1.2 VR1​ = 4.7 kΩV2​ = 1.6 VR3​ = 4.7 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 = −1.2 VV2 = 1.6 VR1 = 4.7 kΩR2 = 22 kΩR3 = 4.7 kΩR4 = 4.7 kΩ
Vout = V

Answer key

  1. 1. Vout = 0.47 V
  2. 2. VL = 6.967 V
  3. 3. Rf = 42.3 kΩ
  4. 4. Rf = 22 kΩ
  5. 5. Vout = −3.4 V
  6. 6. Vout = 10.16 V

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