Re: Digital VX40B - Multia?
John Klos <[email protected]> Mon, 1 Apr 2024 17:55:54 +0000 (UTC)
| Newsgroups | gmane.os.netbsd.ports.alpha |
|---|---|
| Message-ID | <[email protected]> |
>> That capacitor is precisely cut on purpose to give it an exact value. >> That's done with resistors, too, for certain applications. > > Whoa, no. That is an "arc gap" capacitor, which is a capacitor that has an > integral spark gap that shunts high-voltage spikes to ground, usually on > signals that leave a board and are expected to have long wires. (Note that > it's right next to an external connector) > > The capacitance is fixed and is not affected by the cut, and the dimensions > of the cut determine the breakdown voltage, not the capacitance. > > To be clear, this is an ESD protection component, manufactured this way on > purpose, it is not damaged, and it is not a precision component in any way. > > (Disclaimer [or is it a "claimer"?]: I am a design engineer who has > designed these components into commercial products, though not for DEC.) That makes a lot more sense. It's good to learn something new :) John