APPLIANCE TIMER


Posted on Feb 5, 2014

Controls intervals up to 1 h in 1-s increments as programmed by thumb wheel switches S1 and S2. Circuit is basically two-stage programmed counter driven by 1-s clock derived from 60-Hz power line. A1 is connected as divide-by-60 counter triggered by 60-Hz signal developed across D2. 1-Hz output from A1 triggers A2 which in tum triggers A3, all pro


APPLIANCE TIMER
Click here to download the full size of the above Circuit.

grammable timers. When S3 is closed, R4 bus goes low to start timing cycle. Relay driver A4 holds relay K1 closed for application of AC power to device being controlled and energizing of LED to indicate active timing cycle. Applications include uses as kitchen and darkroom timers, -W. G. Jung, "IC Timer Cookbook, " Howard W. Sams, Indianapolis, IN, 1977, p 214-218.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Fast High-Voltage Linear Power Amp Circuit
    Electronic Slot Machine Circuit
    4046 PLL bassed A roulette wheel electronic circuit with explanation
    sound source locator uses
    Triac lights automatically switch schematic
    Counter circuit diagram of the digital circuit



    Top