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​ = 4.7 kΩVin​ = 0.3 VR1​ = 1 kΩI1​

The op-amp is ideal and runs from ±15 V supplies. Find the current I1 through R₁, flowing towards the op-amp.

Vin = 0.3 VR1 = 1 kΩRf = 4.7 kΩ
I1 = mA
2.Easy
−+Vout​10 VRs​ = 1 kΩRL​4.7 kΩIL​

A sensor behaves like a 10 V source with an internal resistance Rs = 1 kΩ. It feeds a load RL = 4.7 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current IL supplied by the op-amp output.

Vs = 10 VRs = 1 kΩRL = 4.7 kΩ
IL = mA
3.Medium
−+Vout​Rf​ = ?R1​ = 10 kΩVin​

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

R1 = 10 kΩAv = 2
Rf = kΩ
4.Medium
−+Vout​R2​ = 47 kΩV1​ = 0.3 VR1​ = 4.7 kΩV2​ = 0.2 VR3​ = 4.7 kΩR4​ = 47 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 = 0.3 VV2 = 0.2 VR1 = R3 = 4.7 kΩR2 = R4 = 47 kΩ
V− = V
5.Hard
−+Vout​Rf​ = 22 kΩV1​ = 0.3 VR1​ = 2 kΩV2​ = −1.3 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 = 0.3 VV2 = −1.3 VR1 = 2 kΩR2 = 22 kΩRf = 22 kΩ
If = mA
6.Hard
−+Vout​Rf​ = 10 kΩV1​ = 1 VR1​ = 4.7 kΩV2​ = −0.1 VR2​ = 1 kΩ

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

V1 = 1 VV2 = −0.1 VR1 = 4.7 kΩR2 = 1 kΩRf = 10 kΩ
Vout = V

Answer key

  1. 1. I1 = 0.3 mA
  2. 2. IL = 2.128 mA
  3. 3. Rf = 10 kΩ
  4. 4. V− = 0.1818 V
  5. 5. If = 0.09091 mA
  6. 6. Vout = −1.128 V

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