No floating nodes – EDN


The schematic beneath was screen-shot from a LinkedIn group. I heard alarm bells go off in my head once I noticed it (Determine 1).

Determine 1 A advised utility be aware diagram present in a LinkedIn group with a floating node between C4 and C5 that would result in voltage breakdown.

Capacitors C4 and C5 are positioned in sequence with one another in order that their widespread node has no DC path to wherever. Once I labored on some spacecraft initiatives, this was completely a forbidden factor to do as a result of any floating node like this might drift to an indeterminately excessive voltage and result in voltage breakdown.

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Even in an earthly milieu, this is usually a drawback. Think about one thing getting used or merely being transported or shipped in a thunderstorm atmosphere. Dr. Frankenstein’s lightning bolts may do some actual hurt.

I do not know why within the above schematic the sequence pair of C4 and C5 wasn’t merely made a single 0.5 pF capacitance.

The fundamental badness of letting one thing float has been checked out earlier than in “Design precaution: Depart nothing floating”.

It seems like somebody didn’t get the message.

John Dunn is an electronics guide, and a graduate of The Polytechnic Institute of Brooklyn (BSEE) and of New York College (MSEE).

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