Richard Mellina wrote:
>
> I am new to electronics and have some questions about the 7800 series
> voltage regulators. What happens when the supply voltage goes below the
> regulated output voltage? Does the regulator stop giving an output or does
> it just output the supply voltage? Any help would be greatly appreciated.

Some of the low-dropout 5v regulators i've tried
are ok with this. At least under 100mA or so.
When the supply volts are less than 5v the output
is fixed at the supply volts minus about 50mV.
-Roman

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