timer help..please

Discussion in 'The Projects Forum' started by fatman41, Mar 9, 2012.

  1. fatman41

    Thread Starter New Member

    Mar 7, 2012
    2
    0
    I want to make a timer that will open a contactor .5 second to one second per minute..i would also like room for adjustment say on time up to 3 seconds per 4 minutes. what do i need to make this happen..
    i have zero experiance in this :(
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    A 555 IC timer ckt should work. Using separate pots,1 meg & 10k, for charging & discharging a capacitor of about 300 μF should give the required range. Need contactor coll inf. & available V.
     
  3. fatman41

    Thread Starter New Member

    Mar 7, 2012
    2
    0
    contactor has yet to be purchased but itll be 110v..coil size of whats available
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    No problem- use a solid state relay. STR, to couple 555 output to 110V AC coil. Read up on 555's at top of page ,Volume VI-Ch 8- Expereriments- 555 Hysteretic Osc. Would use a slight modification to allow seprate control of on & off states.
     
Loading...