less hum: switching power supply?

[Paul Perry]

At 11:45 AM 5/06/00 -0400, Jay Martin  wrote:
>I beg to differ,
>The 78xx series of regulators do NOT have built in protection for shorting,
>overheating or reverse-voltage damage 

Hmm.. there is certainly overheating protection on the National Semi 78xxs.
And, I've used a hell of a lot of them & never seen '8 volt spiking'.
What do you have to do to get these spikes?

perhaps this is time to note that not all chips with the same type #
are always identical.

paul perry Melbourne Australia