0-30v power supply problem

Discussion in 'The Projects Forum' started by petrile_83, Jan 1, 2016.

  1. petrile_83

    Thread Starter New Member

    Jan 1, 2016
    2
    0
    I'm testing 0-30v power supply based on this circuit

    http://www.electronics-lab.com/proj...-power-supply-with-current-control-0-002-3-a/

    I'm using it without transformer and feed supply voltage from my bench supply to circuit. Because i can get only positive voltage from bench power supply I use 555 negative voltage generator to to get negative voltage to op-amps. When I try to use same power supply to circuit and negative voltage generator nothing works. I set bench power suplly current limit to low 0,05A value and current limits comes on immediatly when i connect wires.

    But when i use separete battery to power up negative voltage generator everything works. Maybe it's some stupid mistake i'm making. Is it even possible to use bench power supply to get +15 and -15v using negative voltage generator? Drawing attached to post which explains my wiring connections.
     
  2. petrile_83

    Thread Starter New Member

    Jan 1, 2016
    2
    0
    Now I found the problem. I set bench power supply current limit little bit too low. Stupid mistake
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,997
    745
    Turn your current limit up to 1 amp, if it works on the battery then the circuit is ok.
     
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