Comparator Detects Power Supply Overvoltages, Catches Glitches

(A) To maintain an alarm condition when an overvoltage transient disappears, add an SCR to the comparator circuits. For SCR operation, voltages to the comparator inputs are inverted. (B) The triple-voltage monitoring circuit detects transient power-supply overvoltages. If excessive voltage momentarily appears at the 5, 12 and -12V inputs, the LED for that circuit lights and the beeper sounds for as long as the overvoltage lasts.

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Comparator Detects Power Supply Overvoltages, Catches Glitches - Circuitos de Electronica