Replace microcontroller with an oscillator?

Discussion in 'The Projects Forum' started by jellytot, Nov 1, 2014.

  1. jellytot

    Thread Starter Member

    May 20, 2014
    72
    0
    I've created a circuit, which a programmable controller activates a relay in a continuous repeating cycle of 10 milliseconds on, 10 seconds off.
    I want to replace the controller with a oscillator to trigger the relay at the repeating cycle stated above. Is this even possible, considering the very low frequency I require? If someone can point me in the right direction it would be appreciated.

    Thanks!
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    Yes, it is doable but you will end up with a number of chips vs a single microcontroller chip.

    10ms on, 10000ms off is 1:1000 duty cycle.
    If the times are not critical and you can accept 1:1024 duty cycle then you can arrive at a simple solution.
     
  3. #12

    Expert

    Nov 30, 2010
    16,306
    6,816
    You are asking for a 1000 to 1 ratio. 2^10 = 1024
    CD4020 or CD4040 can get pretty close.
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    Great minds think alike.
     
  5. jellytot

    Thread Starter Member

    May 20, 2014
    72
    0
    Thanks for the info! I'll look into this IC.
     
  6. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,648
    764
    Or got the same book... :D :p :D
     
  7. #12

    Expert

    Nov 30, 2010
    16,306
    6,816
    Not likely. MrChips is so different from me that I have difficulty understanding him. I got this information from, National Semiconductor CMOS Logic Databook, 1988 edition, when I needed a time stretcher for a 555 circuit.
     
    atferrari likes this.
  8. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    Nah. I am the erudite one, #12 is more pragmatic. We usually end up with the same conclusion anyhow. That's what I like about him.
     
    atferrari and #12 like this.
  9. #12

    Expert

    Nov 30, 2010
    16,306
    6,816
    Thanks...I think. :p

    I don't have as many hammers as you, but if I choose my nails properly, I can appear to be smart on this site. ;)
    and I promise, learning which nails to choose didn't happen overnight!
     
  10. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    2,689
    2,750
    Nice segue there, #12...
     
Loading...