LM7805 5v Voltage Regulator - How It Works

Here is the LM7805 5v Voltage Regulator and here's how It Works

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Tags:12v to 5v 7805 voltage regulator

[rongarza]

So anything above 5 volts is discarded as heat. This would work as a surge suppressor for any spike over 5 volts, right?. What happens if it doesn't get 5 volts input, nothing is output and it all turns to heat, or what?

[thomascioban]

Is the input voltage between -7v and +27v?