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Automotive delay relay

Discussion in 'Electronic Basics' started by setare, Aug 14, 2005.

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  1. setare

    setare Guest

    I would like to make an automotive delay relay circuit by 555, but by
    turn on/off another relay near this circuit the delay time changes, I
    used regulator, inductor and RC filter for input supply but
    unfortunately the problem not solved,Iwill be glad if suggest me an
    application solution.
     
  2. PeteS

    PeteS Guest

    Unfortunately, your description is as clear as mud.

    If you would describe your desired application more precisely, we may
    be able to help.

    Cheers

    PeteS
     
  3. Figaro

    Figaro Guest

    |I would like to make an automotive delay relay circuit by 555, but by
    | turn on/off ANOTHER RELAY near this circuit the delay time changes, I
    | used regulator, inductor and RC filter for input supply but
    | unfortunately the problem not solved,Iwill be glad if suggest me an
    | application solution.
    |
    It seems that spikes/noise from that other relay (when it operates) is
    causing your 555 to misoperate. Perhaps, a reverse diode and/or capacitor
    across its coil might sufficiently reduce spikes/noise that affect the 555.
    For example, see http://relays.tycoelectronics.com/app_pdfs/13c3311.pdf
     
  4. John Fields

    John Fields Guest

    ---
    You haven't said how you're triggering the 555, so I didn't show
    anything about that,but try this for the power supply:


    78L05
    +-------+
    +12V>----+---[1N4002>]--+--------+------|IN OUT|---+--+5V
    |K |K |+ | GND | |
    [1N4002] [1N5355] [1000µF] +---+---+ [0.1]
    | | |25V | |
    GND>-----+-+------------+--------+----+-----+-------+
    | |
    | 7555 |
    | +--------+ |
    +---|GND | |
    | | | E
    [0.1] | OUT|---[150]---B 2N4401
    | | | C
    +5V--+---|Vcc | |
    +--------+ +---------+
    | |
    [IN4001] [COIL]- - |
    |K | O--> |<--O--NC
    +---------+ | |
    | | O------COM
    +12V |
    +-----------NO

    Also, I showed a CMOS 555, but a bipolar should work just as well,
    and you can use any transistor (or logic-level MOSFET) which can
    drive the relay. Keep the wiring short and the capacitors as close
    to the IC packages as you can.
     
  5. Terry

    Terry Guest

    On Sun, 14 Aug 2005 10:58:32 -0500, John Fields

    ........ try this for the power supply:

    ....snip...

    Now that's what I call bulletproof! Betcha can't even hear the 'clik!'

    Cheers--
    Terry--WB4FXD
    Edenton, NC
     
  6. ehsjr

    ehsjr Guest

    And for his work, will he even get a thank you from the op?
    It would be refreshing. Too often, the op disappears, and we
    never learn how he/she made out. And too often, somone posts
    a nice solution and doesn't get any appreciation from the poster.
    Grumble.

    Ed
     
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