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:

New Circuits

.

 


Popular Circuits

Transistor and diode tester
Variable audio oscillator 20hz to 20Khz
Prology DVD-200 remote control
No-bias L-C High-Frequency Oscillator
typical circuit diagram of star delta
5v 10a output switching power supply
Solar Panel Based Charger And Small LED Lamp
Hardware circuit C51 microcontroller serial communication
Three-phase asynchronous motor PTC protection circuits



Top