Hi there and another timer circuit

Discussion in 'General Electronics Chat' started by ferret141, Sep 5, 2009.

  1. ferret141

    Thread Starter New Member

    Sep 5, 2009
    2
    0
    Hi there, I go by the name of Ferret. I'm 18 and live in the UK.

    Since I'm into making things myself rather than buying them I thought I'd become a bit more involved with electronics. I currently help out a local motor club with their rally car as a mechanic. They're in need of a timer to keep the fan and water pump running when the car comes back from a stage and the engine is off. So that's my intended project.

    I would place myself as a beginner but I can learn quickly and understand pretty much any theory you throw at me. So I'm here to request the help of you kind fellows. Can you recommend any reading material/guides to get me started.

    Thanks
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    The industrial term for that is a "delay-on-break" or delay-off timer/relay.

    But, on most cars the water pump is driven by a belt connected to the motor. Unless you could somehow install a parallel, electric, auxiliary water pump you would need to keep the motor idling. I have seen threads about delay-off motor shut-down timers to allow turbo chargers to cool down.

    ken
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Google 555 monostable.
     
  4. Lanz

    Active Member

    Oct 30, 2008
    153
    0
    As Ken said,the water pump is driven by the belt from engine pulley.But now at the market got electric water pump which driven by a motor.You can control the pump if driven by a motor.And as mik3 said,555 can do the timer job.
     
  5. ferret141

    Thread Starter New Member

    Sep 5, 2009
    2
    0
    I have spotted the 555 Monostable Mutlivibrator, currently reading up the theory behind it because I would rather understand and be able to build from scratch if I wanted to rather than copy someone else's idea.

    I do realise the water pump is belt driven. I hadn't concerned myself with it till I built a working circuit that kept the fan going at least.

    Thanks for the input everyone. I'll keep an update of my progress.
     
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