bench power supply

Discussion in 'General Electronics Chat' started by jmh474, Jul 13, 2014.

  1. jmh474

    Thread Starter New Member

    Jun 26, 2014
    Hi all, so i have a transformer rated at 17 volts and 5 amps also is there any way of stepping the voltage to 24 volt, i would like to make a bench power supply making variable voltage and current, im quite new to all of this electronics but mi am a electrician but i only really done houses and office building etc... so does anyone out there know of any good guides out there that can help me out please thanks
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    it would make a good 0-15v psu with circuit like this, replace the 220R resistor for a 330R.
    Last edited: Jul 13, 2014
  3. Shagas

    Active Member

    May 13, 2013
    Try reading about buck/boost circuits , but those are not simple or for a beginner imo, especially if you don't have a good scope.
  4. MrChips


    Oct 2, 2009
    17V x 1.4 = 23.8V

    You should be able to get about 18VDC supply out of this.
  5. adamclark


    Oct 4, 2013
    are there any other taps on it you can series?
  6. MrAl

    Well-Known Member

    Jun 17, 2014

    The simplest way to convert a 17vac secondary output transformer to a 24vac output transformer is to put the 17vac transformer aside and buy a 24vac output transformer :)

    I am partly kidding there, but when you have 17vac at 5 amps and try to convert it a higher voltage (even DC) there will be less current available. For example, if you were successful in converting 12v at 5 amps to 24v, the maximum current available even with a perfect converter circuit would only be 2.5 amps. Because converters are not that good, even with 17v you may end up loosing 1/2 of the available current, so that leaves you with only about 3 amps maybe. That would be with a boost converter circuit.

    If you use large filter caps you might get away with taking advantage of the peak voltage. Unfortunately you loose voltage with the rectifier diodes too and more at full load.