AC DIGITAL CLOCK WITH STANDBY BATTERY


Posted on Feb 6, 2014

Uses MM5316 alarm-clock IC, originally designed to drive LCD or fluorescent displays, but modified here for LED display Diodes and batteries provide power if AC fails, with blanking of display to extend battery life. Accuracy is poor on batteries but batteries make resetting of time and alarm easier after AC interruption. Alarm uses 555 multivibrator


AC DIGITAL CLOCK WITH STANDBY BATTERY
Click here to download the full size of the above Circuit.

to produce frequency-shfft warble on output tone. Time is set by fast and slow buttons, and alarm is set with same buttons while depressing alarm-display button. Transistor type is not critical. -M. F. Smith, Digital Alarm Clock, Wireless World, Nov. 1976, p 62.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Monostable oscillator
    Digital-ir-transmitter
    Electronic Slot Machine Circuit
    Vacuum Tube 80-40M Transmitter Circuit
    Simple Pulse Generator
    7812 ic 12 volt 30 amp psu circuit electronic circuit schematic
    simple home alarm system pcb
    RS 422 Compatible Indicator
    Audio Mixer Circuit
    NC visible laser modulation driver circuit
    1B32 bridge sensor signal conditioner with multi-channel application circuit when the pressure sensor



    Top