- #1
itzernie
- 23
- 4
Homework Statement
I recently completed a lab where I set up a buffer amp. Its input was a function generator set at 5Vp amplitude and we placed various load resistors on the output to test Vout on an oscilloscope ( 75kΩ, 3300Ω, 510Ω and 68Ω.) From my data I noticed that the Vout was the same for the first 3 (which makes sense since the buffer amp overcomes the loading effect), but for the 68Ω the Vout value decreased.
Since Vout on a buffer = Vin, how is this possible ? Or does the buffer amp only decrease the loading effect of a practical source? Not remove it.
Homework Equations
Vout = Vin
The Attempt at a Solution
I know that a smaller load resistor would increase the current coming out of the Op Amp, but I am not sure how that could effec the output voltage.