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Replace 6 AA with 9v 1~2 amp DC adapter

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Discussion in 'Power Electronics' started by ionman101, Sep 26, 2018.

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  1. Sep 26, 2018 #1
    ionman101

    ionman101

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    Sep 26, 2018
    Ok, i am a complete novice as most can tell by the title. I did a little research, but considering the smoke rising from my appliance, not enough.
    I replaced 6 AA batteries (in line) which i assume to be about 9v with 1 to 2 ah with the 9v 1~2a adapter.
    I know there is a difference between amp hour and amp but my faulty reasoning told me the appliance would only pull the amount of amperage required to run it.

    What did i do wrong and how do i replace the next battery powered device with a dc adapter. I am going to do this again, I'd rather not ruin the next one.
     
  2. Sep 26, 2018 #2
    Bluejets

    Bluejets

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    Reverse connection...??
    AC adaptor instead of DC...??
    Anybody's guess....you have it in front of you but it's impossible for us to see from here.
     
  3. Sep 26, 2018 #3
    ionman101

    ionman101

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    Sep 26, 2018
    I'm fairly certain it is the correct direction. AC\DC adapter says negative is on the outside of jack, i have that soldered to the negative AA terminal.
     

    Attached Files:

  4. Sep 26, 2018 #4
    ionman101

    ionman101

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    Sep 26, 2018
    *directly flipped appliance to show solder to neg terminal
     

    Attached Files:

  5. Sep 26, 2018 #5
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It is possible that the original device uses the middle of the batteries to generate a +/-4.5V supply.

    Without that connection, bad things may have happened.

    Can you show us what smoked?
     
  6. Sep 26, 2018 #6
    Bluejets

    Bluejets

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    Yes, looks like an extra black wire in the "90" photo above.
     
  7. Sep 26, 2018 #7
    Harald Kapp

    Harald Kapp Moderator Moderator

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    No fault here. The reasoning is correct.

    Good eyesight you have there ;)

    The adapter my deliver 9 V only when loaded by a certain minimum current. With a small load or no load at all the output voltaeg may be well above 9 V which could lead to destruction of the atached device. Can you measure the output voltage of the adapter without any load attached?
     
  8. Sep 26, 2018 #8
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    The adapter has a rated input voltage from 100-240V (or similar). As such I bet it's pretty dead on the voltage.
     
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