"~5.4vdc"?
"~5.4vAC?" " -5.4vdc?" or "....5.4vdc"
I'm not up to speed on readingreadi thisthis thread, so the exact context is unknown to me; but ~ is a symbol for AC; so "~5.4vdc"
It stood out like a sore thumb to me in the paragraph.
(and not elaberating moremore bec of spellwreck).