fast battery discharging @ relay driver switching circuitcircuit

Discussion in 'Homework Help' started by shrikanthkp, Sep 2, 2013.

  1. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
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    I build a switching circuit.Here NPN transistor base gets switching signal from microcontroller & collector connected 9volt 6f22 battery through small resistor Emitter grounded directly. here 9volt sugar cube relay used & relay output (N/o)given to transmitter circuit.
    Here battery gets drained within 24 hours without sending any switching signal from microcontroller.here just circuit ON condition only.
    Plese help me.
    Pl.looking forward valuable replies with great thanks.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,777
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    Help you what? You have given no indication of what it is that you need help with.

    What is the goal of the assignment?

    What are the constraints?

    What have YOU done so far to attempt to solve YOUR problem?
     
  3. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
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    i need help to avoid battery draining in my circuit.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    How about posting the circuit??
    Max.
     
  5. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,804
    What circuit?

    We are NOT mind readers!

    Throw us a bone!

    Sketch your circuit to give us something to start with.
     
  6. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
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    to overcome battery discharging problem i tried load (transmitter) taken from emitterdirectely (with out relay) insted of relay connected @ collector,then also battery discharged (9 volt to 5 volt ) within 24 hour without triggering input.As per my expection battery should come atlest 6 months.
    Please help me...
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I feel like 'Carnac the Magnificent' holding the envelope up to my forehead!
    Max.
     
  8. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,804
    What current are you expecting to pull from the battery?

    What current are you actually pulling from the battery?

    And for the LAST time -- post your circuit. Otherwise I move on.
     
  9. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
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    My circuit was RF transmitter (Just switching ON/OFF) at the receiver circuit. i had this problem @ transmitter section. Here input triggering through microcontroller,then output of microcontroller given to transistor & relay.
    Relay N/O drives the RF transmitter circuit.
    I dont know how send circuit diagram here.So i just explined.
     
  10. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,804
    But your description isn't anywhere near good enough to let us figure out what your circuit is, let alone figure out why it is drawing excess current.

    Do you have Paint or any other drawing program of any kind that can produce sill image files such as PNG, BMP, or JPG format?

    If so, then sketch your circuit -- it does NOT have to be pretty -- and attach it to your post. Click the "Go Advanced" link and then scroll down and click "Manage Attachments" to upload your file.
     
  11. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
    13
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    Attached Circuit PDF format
     
  12. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
    13
    0
    Attached circuit PDF format
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,565
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    What is U2?
    Also maybe use a 2N7000 instead of Bi-polar transistor.
    Max.
     
  14. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
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    U2 microcontroller
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Does it have a part number?
    Max.
     
  16. shrikanthkp

    Thread Starter New Member

    Aug 30, 2013
    13
    0
    u2= pic 12f508
     
  17. wayneh

    Expert

    Sep 9, 2010
    12,153
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    I'm not too sure about the rest of the circuit, but 7/12ths of your power is being burned off in the 7805 regulator.

    I thought you said 9V battery. The drawing shows 12V.
     
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