[sdiy] L7912ACV puts out -16.3 volts

[jh.]

> I thought about other threads on these parts... that you can
> put a resistor between ground and the ground pin to raise the
> regulation voltage.  So imagine a poor solder connection
> (a resistive connection) between ground and the ground pin.
> Voila, a resistor and then the regulator puts out too much
> voltage.  Capacitance could cause startup and shutdown problems,
> maybe stability issues, but not overvoltage (AFAIK).

And special care should be taken when using trimpots on
adjustable regulators. When the wiper comes loose, you want
the voltage to drop, not to rise !

JH.