Transformerless led digital alarm clock

Details Transformerless led digital alarm clock Transformerless led digital alarm clock

G - Physics

04

G

G04G 19/04 (2006.01) G04C 10/00 (2006.01) G04G 9/10 (2006.01) G04G 19/10 (2006.01)

Patent

CA 2327129

A transformerless LED digital display clock circuitry using AC line voltage as a primary source of power is disclosed. The AC line voltage is substantially reduced to around 10 volts or less and then rectified to provide DC power to the quartz analog clock. Also included is a NiCad battery circuitry used as a power backup and to allow for occasional but high current using devices. The LED digital display is made up of four separate "digit" displays each independently controlled by four separate cathode outputs from a microprocessor.

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