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

A sensor behaves like a 2.5 V source with an internal resistance R_s = 47 kΩ. It feeds a load R_L = 2.2 kΩ through an ideal voltage follower (unity-gain buffer). For comparison, find the load voltage V_L if the load were connected directly to the sensor without the buffer.

V_s = 2.5 VR_s = 47 kΩR_L = 2.2 kΩ

V_L = V

2.Easy

A sensor behaves like a 2.5 V source with an internal resistance R_s = 1 kΩ. It feeds a load R_L = 4.7 kΩ through an ideal voltage follower (unity-gain buffer). Find the load current I_L supplied by the op-amp output.

V_s = 2.5 VR_s = 1 kΩR_L = 4.7 kΩ

I_L = mA

3.Medium

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 = 1.9 VV₂ = 2.4 VR₁ = R₃ = 2 kΩR₂ = R₄ = 47 kΩ

V₋ = V

4.Medium

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

V_in = 1.6 VR₁ = 10 kΩR_f = 22 kΩ

V_out = V

5.Hard

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

V₁ = −0.3 VV₂ = −1.9 VR₁ = 47 kΩR₂ = 100 kΩR_f = 22 kΩ

V_out = V

6.Hard

The summing amplifier uses an ideal op-amp with ±15 V supplies. Find the current I_f through the feedback resistor, flowing towards the output.

V₁ = −1.6 VV₂ = 1 VR₁ = 4.7 kΩR₂ = 10 kΩR_f = 47 kΩ

I_f = mA

Answer key

1. V_L = 0.1118 V
2. I_L = 0.5319 mA
3. V₋ = 2.302 V
4. V_out = 5.12 V
5. V_out = 0.5584 V
6. I_f = −0.2404 mA

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