About Dc power supply

Discussion in 'General Electronics Chat' started by sony85, Mar 8, 2016.

  1. sony85

    Thread Starter Member

    Aug 26, 2012
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    0
    Hello !
    I would like to ask you. How can I charge smart phone with Dc power Supply directly.
    I setup dc power supply 3.7v and place red/black alligators + - direct to main board , but it wont turn on.

    Thanks
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    The phone wont turn on without the battery being charged up to a minimum level first, neither will it come on with the battery removed. So your charger needs to give out 5v minimum.
     
    Last edited: Mar 8, 2016
  3. sony85

    Thread Starter Member

    Aug 26, 2012
    43
    0
    I got it , but I want to turn it on without battery is it possible..
    using those connectors gsm_03284img328475-kaisi-test-kabel-za-iphone.jpg
     
  4. #12

    Expert

    Nov 30, 2010
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    No, a cell phone will not run without a battery.
     
  5. sony85

    Thread Starter Member

    Aug 26, 2012
    43
    0
    Thanks
     
  6. wayneh

    Expert

    Sep 9, 2010
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    My Blackberry used to. Maybe the one exception to the rule.
     
  7. #12

    Expert

    Nov 30, 2010
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    Are we talking about solar panels? I have some TI-30 SLR calculators that have a solar panel in them. No batteries for 30 years!:eek:
    Or are we talking about using some external source?
    By the time we get done with this, I might find out I'm wrong.:oops:
    How does a Blackberry run with no battery?
     
  8. wayneh

    Expert

    Sep 9, 2010
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    As long as it was plugged into its adapter (USB to mini, like the old camera cable), it would run fine while you popped the battery out. It was the way to swap batteries without rebooting. I believe every phone I've ever had with a removable battery (ie. everything that wasn't an iPhone) would run off it's adapter with the battery removed. Same deal with laptops.
     
    Last edited: Mar 8, 2016
  9. #12

    Expert

    Nov 30, 2010
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    Then I was wrong.:oops:
     
  10. wayneh

    Expert

    Sep 9, 2010
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    Not wrong, just ignorant! :p
     
  11. #12

    Expert

    Nov 30, 2010
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    I have difficulty telling the difference after a wrong statement comes out of my mouth (or keyboard).:(
     
  12. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Do you mean Unknowlegeable,Unlearned, lacking practical evidence, surely not arrogance! :D

    My old Nokia lumia wouldn't power up without the battery fitted even with the charger in, needless to say its now been replaced with an android phone....
     
  13. #12

    Expert

    Nov 30, 2010
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    Yes, Dave. Ignorant and arrogant have very different meanings.
    "Arrogant" would be me insisting I'm right after I know I'm wrong.
     
  14. wayneh

    Expert

    Sep 9, 2010
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    I plead ignorance on that basis all the time. I do not see the term as pejorative. (That's what "stupid" is for.) We are all very deeply ignorant on most things. Some of us know a little about a little.
     
  15. WBahn

    Moderator

    Mar 31, 2012
    17,715
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    FWIW - My Samsung (old flip phone) will not run without the battery. If you remove the battery while it's on (with a charger) it will promptly say "No Battery" and shut down. If you try to turn it on without a battery it will start the boot process and, within about three seconds, shut itself off with no fanfare whatsoever.
     
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