A.C. and D.C. voltage polarity indicator utilizing electrochromic cells

摘要

An electrochromic voltage indicator for detecting the presence and polarity of d.c. voltage, as well as for detecting the presence of a.c. voltage, includes two electrochromic cells, two contact terminals, two capacitors, two resistors and two diodes. First leads of each of the diodes are interconnected and are connected to first leads of each of the resistors and to first leads of each of the electrochromic cells. A second lead of each of the electrochromic cells is electrically connected via a respective capacitor to a second lead of the respective resistor to a second lead of the respective diode and to the respective contact terminal.