Voltage buffer

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01:27:50

AKA voltage mirror or voltage follower.

Note how the LED burns out due to the heavy load imposed by the lamp. 

Toggle the switch to enable the opamp - it acts as a voltage buffer, protecting the LED while still providing enough power to the lamp.

This's circuit allows a low impedance circuit (right side) to follow (mirror) changes in voltage from a high impedance circuit (left side). Voltage buffers are the counterpart to current buffers. The difference is which side has low/high impedance.

published 10 years ago

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