Jeroleen,
> Negative Feedback. Is this the output of a device being re-routed through itself or something like that. Why is this done and what would happen without it? <
Negative feedback is used to make the output of an amplifier circuit more closely resemble the input. That is, it improves the frequency response and lowers distortion. For example, an oven with a thermostat is an application of negative feedback. When the heat rises too high the thermostat turns off, and when the temperature drops too low it switches back on. The net effect is to maintain a constant temperature, which is a linear condition. Likewise with a toilet, where the valve and float work together to maintain a constant water level in the tank.
--Ethan
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