Hi Stan, A simple low pass filter made of 2 large inductors and a few high voltage capacitors will do the trick nicely. Which is not a slow reacting device being passive. Combine this with polyswitch style protection and some method of discharging a really high voltage to ground and it'll be even better. A very cheap design that should be in all UPS's. And is certainly a whole lot better than nothing at all for removing harzardous spikes, etc.
-----Original Message----- From: StanSquncr [SMTP:StanSquncr@aol.com] Sent: Thursday, March 19, 1998 4:59 PM To: spectre@anthrax.net; cypherpunks@toad.com Subject: Re: UPSs
In a message dated 98-03-18 23:54:33 EST, spectre@anthrax.net writes:
<< ... Any decent ups will put the incoming power through a "conditioner" that will filter out noise in the incoming power, and rebuild the wave so that transient sags and spikes don't get through. ...
BUT, even the fastest electronics cannot respond fast enough to the initial spike, if that spike is too high in the first place (if your incoming power lines get hit by lightning, for instance), it's already too late. My suggestion, don't trust a UPS to eliminate spikes, get it if you anticipate a need for back-up power to shut down your system in case of black-out (and screw the surge protectors, trust the filtering in your power supply to do that for you.)
Stan