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​ = 100 kΩVin​ = 0.3 VR1​ = 4.7 kΩ

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

Vin = 0.3 VR1 = 4.7 kΩRf = 100 kΩ
Vout = V
2.Easy
−+Vout​10 VRs​ = 2.2 kΩRL​0.47 kΩ

A sensor behaves like a 10 V source with an internal resistance Rs = 2.2 kΩ. It feeds a load RL = 0.47 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 = 10 VRs = 2.2 kΩRL = 0.47 kΩ
VL = V
3.Medium
−+Vout​R2​ = 22 kΩV1​ = 0.4 VR1​ = 4.7 kΩV2​ = −2.1 VR3​ = 4.7 kΩR4​ = 22 kΩ

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

V1 = 0.4 VV2 = −2.1 VR1 = R3 = 4.7 kΩR2 = R4 = 22 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 2 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 3.

R1 = 2 kΩAv = 3
Rf = kΩ
5.Hard
−+Vout​Rf​ = 2 kΩV1​ = −1.4 VR1​ = 2 kΩV2​ = 1.7 VR2​ = 47 kΩ

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

V1 = −1.4 VV2 = 1.7 VR1 = 2 kΩR2 = 47 kΩRf = 2 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 4.7 kΩV1​ = 1.5 VR1​ = 47 kΩV2​ = −1.3 VR2​ = 10 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 = 1.5 VV2 = −1.3 VR1 = 47 kΩR2 = 10 kΩRf = 4.7 kΩ
If = mA

Answer key

  1. 1. Vout = −6.383 V
  2. 2. VL = 1.76 V
  3. 3. Vout = −11.7 V
  4. 4. Rf = 4 kΩ
  5. 5. Vout = 1.328 V
  6. 6. If = −0.09809 mA

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