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Help finding unusual power supply

Discussion in 'Power Electronics' started by Brains, Jun 23, 2017.

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  1. Brains

    Brains

    2
    0
    Jun 23, 2017
    I have a device that requires 5 connections as follows:

    Gnd
    +12v dc
    -12v dc
    Com
    Com

    Thats all the manual states unfortunately. Anyone know of an off the shelf power supply that would fit the bill? I cant find one anywhere. Im in the uk by the way.

    Thanks so much for anyone that can help.
     
  2. duke37

    duke37

    5,297
    739
    Jan 9, 2011
    A computer ATX PSU can do this with other outputs. My neigbour has just taken one to the tip:(.

    What is the load, Op-amps usually go up to 18V and run on 15V. You should be able to find one of these and drop the voltage a little if necessary.
     
  3. Brains

    Brains

    2
    0
    Jun 23, 2017
    Thanks for the prompt response. I dont know the impedance or current draw and its actually a unit i have not bought yet (trying to work out the psu conundrum before purchasing) so i wont be able to work it out.

    Do some atx power supplies have -ve +ve and common as well as ground connections? So far i cant find any with all four of the required connections. Have you an example link to one?
     
  4. duke37

    duke37

    5,297
    739
    Jan 9, 2011
    I might have something here but you will need to know whether you need 10mA or 10A:)
    Common is the reference for the 12V supply. I presume that Gnd is ground or the case.

    How far are you from Matlock?
     
  5. Externet

    Externet

    732
    154
    Aug 24, 2009
    You can use two 12V PS wall adapters, connected this way :

    (+12V)----------(+)PS1(-)----------common----------(+)PS2(-)--------------(-12V)

    Connect 'common' to both terminals marked as 'Com'. The ground should be picked from the wall outlet or properly. Is there is a label on the device to be supplied, tell us the amperage stated, or attach a picture of the label.
     
  6. duke37

    duke37

    5,297
    739
    Jan 9, 2011
    I have two power supplies which you are welcome to.

    1. +/-18V in steel case 153*102*44, 650g with standard mains input socket and mains switch.
    This has broken mains fuse holder.
    It is just smoothed with emitter followers but there is room in the box for 3812 and 3912 regulators.

    2. Amplicon 902 sealed PSU, +/- 15V 100mA
    In aluminium die cast box 171*120*55 with good fuse holder.
    Input via short mains three cored cable. Output via three screwed posts.
    Checked a few years ago.

    I have other supplies but do not have the ability to look for them.

    I do not want to bother boxing these up, you have not said where you are.
     
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