Designing a 555 timer to produce pulses from one per second-on per 10 seconds

Discussion in 'Homework Help' started by monkeyhead, Mar 5, 2007.

  1. monkeyhead

    Thread Starter Active Member

    Mar 5, 2007
    45
    0
    Hi,
    As the title states, I need to produce a circuit which includes a 555 timer.How ever I know I have to use the formula: f=1.44/(R1+2R2)*C
    Would I be right in assumeing I would need to use a variable resistor that will change the rate of pulses?
    Many thanks
    Matt
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If you only need the two rates and nothing in between, it's easier to switch timing capacitors.
     
Loading...