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[help] making a 24v supply

Discussion in 'General Electronics Chat' started by rahuljin, Mar 28, 2008.

  1. rahuljin

    rahuljin New Member

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    i have quarries :----

    1. Someone told me that it is possible to make a 24V supply using a 12v transformer but he didnot know how to make it properly to get a 24v dc output correctly. can anyone help me to build a 24V supply(1 Ah current) ??

    2. Suppose i have a 24V supply, then how can i get a 20V output from it ???

    please help me !!! thanks anyways
     
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    Does this help.?
     
  3. rahuljin

    rahuljin New Member

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    thanks for the reply !!! i want to know how to convert 12v to 24v with a voltage doubler ??? i dont have any idea about it !!!
     
  4. dave

    Dave New Member

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  5. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    Look here:

    http://www.tpub.com/neets/book7/27m.htm

    http://virtual.cvut.cz/dyn/examples/examples/electronic/doubvolt/
     
  6. rahuljin

    rahuljin New Member

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  7. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi,
    You did say in your OP that it was a 12v transformer... not a dc psu.

    I would suggest a SMPS to boost from +12Vdc to +24Vdc.
     
  8. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The ICL7660A has a max allowed supply voltage of 12.0V.
    It can make a negative output of 10V with a current of only 40mA.
    Then you will have 22V at 40mA.
     
  9. mvs sarma

    mvs sarma Well-Known Member

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    Whether the voltage doubler will deliver such currents like 1Amp at 24V?

    As rightly pointed out by Audioguru, we may have to look for better converters.There from Viper50 etc, from ST Micro, and LNK switch from Power Integration Inc for converting 12 to 24.

    24 to 20 conversion for 1 amp load, LM317 will suite, but needs a good heat-sink.
    If it is for end use and one off, (not a project work) It is also possible that Rahuljin can use Pinter power adapters, as they are available for a throw away price and are available at 20V and 19V also.
     
    Last edited: Mar 31, 2008
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