Feedback Everywhere

Bodies, microphones and loop gain

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Negative feedback opposes change and keeps systems near a setpoint.
• Loop gain above 1 makes signals grow: howls and runaways.
• Positive feedback amplifies, sometimes usefully, but needs limits.

Steps

1. Negative feedback keeps you alive
2. Loop gain
3. Just above one
4. Positive feedback
5. A wiring mistake
6. Shrinking the error