Op amp voltage follower unity gain amplifier circuit: Operational amplifier tutorial
Operational amplifiers (op amps) make great voltage followers! If you feed the output voltage directly to the inverting input (negative feedback), then the op amp will do a good job at holding the output voltage to whatever the voltage applied to the non inverting input is.
Single supply op amp voltage follower
If more power (specifically, more current) is needed than the op amp output can provide, then a transistor wired as an emitter follower can be added to the output as shown in the video below. I wasn’t careful enough with the power handling capacity of the transistor after I replaced the LED with a 10Ω 10W resistor load. I probably fried a transistor experimenting between shots. So, don’t build any high power circuits based on this simple demonstration circuit.
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