Delay Timer Circuits?

Discussion in 'The Projects Forum' started by KK1980, Nov 26, 2008.

  1. KK1980

    Thread Starter New Member

    Nov 26, 2008
    3
    0
    Hi,
    I would like to design relay timer circuit using 555 timer and 12V relay. I want my design to be in such criteria:

    Requirement:

    First I will set the timer (for exampe 10s). Then I turn on power (supply the 12V). After 10s, the relay will switch from (NC) to (NO) and stay in such a way. The relay will only switch back to NC when I turn off the power.

    Anyone got any idea how to design this circuit. Can it be achieved using 555 timer or need other IC? Please advice.
    Thanx.

    Nick
     
  2. KK1980

    Thread Starter New Member

    Nov 26, 2008
    3
    0
    Hi,
    I would like to design relay timer circuit using 555 timer and 12V relay. I want my design to be in such criteria:

    Requirement:

    First I will set the timer (for exampe 10s). Then I turn on the power (12V). After 10s (or other timing), the relay will switch from (NC) to (NO) and stay in such a condition. The relay will only switch back to NC when I turn off the power.

    Anyone got any idea how to design this circuit. Can it be achieved using 555 timer or need other IC? Please advice.
    Thanx.

    Nick
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Sounds doable, matter of fact I have seen others do it. Not sure what you mean by setting the timer to 10's though. The 555 is programed using resistors and capacitors. You can read about the monostable here.

    I'll be back with how to connect a monostable to a relay...

    *********************

    [​IMG]

    Parts List:

    R1 : 10KΩ
    R2 : 1KΩ
    C1,2 : 0.1µF
    Q1 : 2N2222
    CR1 : 1N4001
    K1 : Any rated Relay
     
    Last edited: Nov 26, 2008
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