Electronic lock box, access card, system and method

摘要: A lock box in a secure entry system for use with source of DC power having high frequency pulse width modulation thereon comprising housing and key container mounted said movable between accessible inaccessible positions. Circuitry is provided within the controlling movement adapted to be connected power. The circuitry includes filter capacitor. capable receiving modulated capacitor serves supply at least some required by during time occurring on supplied. latch mechanism prevent opening an position hammer blows applied housing.