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​ = 22 kΩVin​ = 0.6 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 = 0.6 VR1 = 4.7 kΩRf = 22 kΩ
I1 = mA
2.Easy
−+Vout​1 VRs​ = 22 kΩRL​10 kΩ

A sensor behaves like a 1 V source with an internal resistance Rs = 22 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 = 1 VRs = 22 kΩRL = 10 kΩ
VL = V
3.Medium
−+Vout​Rf​ = ?R1​ = 47 kΩVin​

Choose the feedback resistor Rf that gives this non-inverting amplifier a voltage gain of 15.

R1 = 47 kΩAv = 15
Rf = kΩ
4.Medium
−+Vout​Rf​ = 47 kΩR1​ = 10 kΩVin​ = 0.6 V

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

Vin = 0.6 VR1 = 10 kΩRf = 47 kΩ
Vout = V
5.Hard
−+Vout​Rf​ = 22 kΩV1​ = 0.4 VR1​ = 1 kΩV2​ = 2 VR2​ = 22 kΩ

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

V1 = 0.4 VV2 = 2 VR1 = 1 kΩR2 = 22 kΩRf = 22 kΩ
Vout = V
6.Hard
−+Vout​Rf​ = 2 kΩV1​ = −1.1 VR1​ = 1 kΩV2​ = 0.4 VR2​ = 100 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 = −1.1 VV2 = 0.4 VR1 = 1 kΩR2 = 100 kΩRf = 2 kΩ
If = mA

Answer key

  1. 1. I1 = 0.1277 mA
  2. 2. VL = 0.3125 V
  3. 3. Rf = 658 kΩ
  4. 4. Vout = 3.42 V
  5. 5. Vout = −10.8 V
  6. 6. If = −1.096 mA

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