Programmable Timer For Long Intervals

Posted on Apr 26, 2012

By using an RC oscillator and a programmable divider, this counter can run for hours. An interval osc

Programmable Timer For Long Intervals
Click here to download the full size of the above Circuit.

illator runs at a frequency given by (see figure schematic): By using, for example, i4 = 390 KOhmhm and C2 = 10 ¥ and R2, the oscillator can run at 0.1 Hz. Divided by 65536, this is a cycle of approximately 655 000 s (182 hours, slightly more than a week). The inputs at pins 12 and 13 of the MC14415 programmable counter determine the number of counter stages selected, and therefore the count.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Sensitive Electrostatic detector
    Simple Deadband Generator Targets Push-Pull Drivers
    TEA5711 TEA5711; TEA5711T AM/FM Stereo Radio Circuit
    High Frequency VCO Design
    VLF Whistler Reception
    Universal Four-Digit Keypad-Operated Switch - Construction Details