| ??? 07/17/06 15:56 Modified: 07/17/06 15:58 Read: times |
#120386 - Come on, Erik, please... Responding to: ???'s previous message |
Erik said:
I have, In one instance, seen the cap you promote exploded from an ESD event, that hardly indicate that such a cap is beneficial to limit the effect of ESD penetration. Come on, Erik, that's absurd. Caps are widestly used to absorb ESD events. None of them get destroyed. And here in our example, even only a small part of ESD current is flowing through the cap, remember, you tied the enclosure to protection earth, so the main ESD energy isn't reaching the cap at all. Finally, what I recommended with the soft grounding scheme is extremely widely used with professional devices. Every single 500VA power stage amplifier I know works that way: Enclosure connected to protection ground and signal ground connected to enclosure ground via cap. This is called "soft grounding". It's not invented by, is used millions of times and is not in danger to be detsroyed as you stated. And the very paranoid ones can still put a transzorb in parallel to the cap. Please, Erik, don't let us doubt well proven facts and design practises. If you think it's wrong what I recommend, then please contact an EMC expert. Kai |
