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​1 VRs​ = 22 kΩRL​1 kΩIL​

A sensor behaves like a 1 V source with an internal resistance Rs = 22 kΩ. It feeds a load RL = 1 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current IL supplied by the op-amp output.

Vs = 1 VRs = 22 kΩRL = 1 kΩ
IL = mA
2.Easy
−+Vout​8.5 VRs​ = 47 kΩRL​2.2 kΩIL​

A sensor behaves like an 8.5 V source with an internal resistance Rs = 47 kΩ. It feeds a load RL = 2.2 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current IL supplied by the op-amp output.

Vs = 8.5 VRs = 47 kΩRL = 2.2 kΩ
IL = mA
3.Medium
−+Vout​Rf​ = 47 kΩR1​ = 4.7 kΩVin​ = −0.1 V

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

Vin = −0.1 VR1 = 4.7 kΩRf = 47 kΩ
Vout = V
4.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 21.

R1 = 10 kΩAv = 21
Rf = kΩ
5.Hard
−+Vout​Rf​ = 2 kΩV1​ = −0.6 VR1​ = 47 kΩV2​ = −1.5 VR2​ = 4.7 kΩ

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

V1 = −0.6 VV2 = −1.5 VR1 = 47 kΩR2 = 4.7 kΩRf = 2 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 47 kΩV1​ = 0.2 VR1​ = 100 kΩV2​ = −1.5 VR2​ = 22 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 = 0.2 VV2 = −1.5 VR1 = 100 kΩR2 = 22 kΩRf = 47 kΩ
If = mA

Answer key

  1. 1. IL = 1 mA
  2. 2. IL = 3.864 mA
  3. 3. Vout = −1.1 V
  4. 4. Rf = 200 kΩ
  5. 5. Vout = 0.6638 V
  6. 6. If = −0.06618 mA

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