On Wed, 28 Dec 2005 02:20:02 -0500, w_tom wrote:

On Wed, 28 Dec 2005 02:20:02 -0500, w_tom top-posted:
....
BTW, power from automotive systems should also worry about
load dump. Technically load dump can be a transient as much
as 270 volts on a 12 volt system. In reality, such events may
only be 50 volts or less. Transients that would not damage
other automotive electronics already designed for this rare
and so destructive event.

That is a problem with some regulators such as 78xx series.
Maximum voltage is typically not sufficient for automotive
purposes - would require additional protection.

This is what transzorbs
http://www.vishay.com/docs/88301/15ke.pdf
and hash chokes are for.

I'm not affiliated with Vishay, formerly General Semiconductor,
just a satisfied customer. I've used them to protect circuits
against the transients caused by a 5 KV arc in an ion gun. :-)

Cheers!
Rich



"James F. Mayer" wrote:
Probably good enough for his measly 32 volts. I need to
modify that circuit to work on outputs of 90 volts and 6 volts.