Hobbyist Question !

Discussion in 'The Projects Forum' started by Electric Al, Nov 8, 2013.

  1. Electric Al

    Thread Starter Member

    Nov 6, 2013
    58
    8
    I have a power supply (salvaged from a boom box) .

    The power supply works fine , and my output voltage is 9 volts D C .

    Without changing any of the components , can I change the connection of the secondary of the transformer , to get 18 volts D C as my output voltage ?

    The secondary of the transformer has taps which are not in present use .

    I think I can , but I do not know what it might do to the other components .

    Help please !

    This may sound like a dumb question !
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,033
    Try probing the other terminals, to see what voltages are there. Without more details, it's impossible to speculate. Try posting a photo. Maybe someone will see something useful.
     
  3. Electric Al

    Thread Starter Member

    Nov 6, 2013
    58
    8

    I just took another look at the power supply , and realised there are no other terminals on the secondary .

    So I have only 9 volts secondary.

    I may try to replace the transformer ( I have a few ).

    Is this wise ?
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,033
    Haha, well the devil is in the details. It's unwise to use the wrong replacement, but as long as the replacement meets the voltage and current rating of the original, it should be fine.
     
    Electric Al likes this.
  5. w2aew

    Member

    Jan 3, 2012
    219
    64
    This will only work if the original is unregulated. If there is a voltage regulator following the transformer and rectifier, then increasing the AC secondary voltage will not change the output voltage (it will just cause the regulator to get warmer).
     
  6. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    If you are thinking of trying a higher voltage transformer, make sure the existing filter caps can handle the higher voltage. And, as mentioned, is there a voltage regulator in the existing supply?
     
    Last edited: Nov 8, 2013
  7. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,033
    I was only addressing replacing the transformer with a similar one.

    There's not enough information to know if doubling the voltage is an option. Tubeguy and w2aew raise good issues.
     
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