Voltage Follower Calculator
Analyze a voltage follower (unity-gain buffer) showing output voltage, input impedance boost, and current capability.
V
kΩ
Ω
Output Voltage
3.300 V
Load Current33.00 mA
Without Buffer (loaded)0.003 V
Output Voltage vs Input Voltage
Voltage Follower (Buffer)
Principle
V_out = V_in (gain = 1)
The buffer presents very high input impedance (megohms) and low output impedance (ohms). It prevents a low-impedance load from dragging down a high-impedance source.
Example Calculation
3.3 V from a 100k source driving a 100 ohm load.
- 01With buffer: V_out = 3.3 V (no loading)
- 02Load current = 3.3 / 100 = 33 mA
- 03Without buffer: V = 3.3 x 100 / (100000 + 100) = 0.0033 V (severe loading)
Frequently Asked Questions
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