Feedback: More than Loud Noise and Joysticks

James Wnorowski

What is Feedback?

• When you put a microphone too close to a speaker?

• Force Feedback Joysticks?

• Something else entirely?

Stability

• Which pendulum is stable, and why?

• Both placements are in equilibrium.

• What happens if I push each mass a little to the side?

Demo

• The first time, I just let the flashlight fall

• The second time, I moved my hand so that it was under the flashlight, preventing it from falling

• This is an example of Negative Feedback

Feedback, Revisited

Review

• To make systems stable, we use Negative Feedback.

• Joystick an example of Negative Feedback.

• Speaker / Microphone combination an example of Positive Feedback.