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Thread: psu from dick smith

  1. #1
    Constant Bitrate samael's Avatar
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    Post psu from dick smith

    i all.
    i am attempting to build a power supply , i have limited knowedge and some parts in sproggys psu are a little hard to find. i can however buy this kit from dick smith electronics , would it be tough enough to power part of my computer , or am i dreaming. i thought maybe buy three or 4 of these and going for gold :

    Universal Regulator Kit
    A low cost, regulated DC power circuit suitable for powering
    external peripherals from a PC, or for powering a CD player from a car lighter socket etc. Uses jumper links to preset output voltage between 3V to 15V and offers output current up to 1.5 amp (use optional heatsink). Power source up to 25 volts DC is required.

    it has a pcb and all the parts and stuff. i thought either build a couple of these and use them , or use it as a base to learn to build sproggys.
    www.dse.co.nz , search for K3594 if you want to have a look at it

    thanks for your help
    samael
    stupid quote # 1 : "i dont do drugs , i only ever smoke pot when i'm coming down" , Me , 6 september , 2001.

  2. #2
    Dustin Haug
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    I wouldn't get that if I were you. The parts there can be had for a few dollars, and depending on your system you may still need to generate negative voltages for serial ports or possibly for an LCD. You'd also need several of them to generate the various voltages and provide enough current to run everything. If you're looking for an easy solution pay attention ot Jeff's power supply he may be offering an atx kit for about what you'd pay for a few of these.

  3. #3
    Constant Bitrate samael's Avatar
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    thanks , i kinda though as much.... i brought one anyway , and built it and prompty fried the ic good learning experience though. what is a negative voltage ? i have seen it refered to , but is there any resource that will give me any answers? thanks
    jake
    stupid quote # 1 : "i dont do drugs , i only ever smoke pot when i'm coming down" , Me , 6 september , 2001.

  4. #4
    Constant Bitrate
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    The other problem is that these reqire the imput voltage to be at least 3 Volts higher than the output. So you could only use it to generate 5 or 3.3 Volts(and a lot of heat).I would suggest you look around the net for some info on how switching reglators. They arent that complicated in most cases. There are many IC's available that perform all the complex tasks involved. Look up the datasheet for the MAX787 at www.maximic.com. It's an example of a very simple switching regulator

  5. #5
    FLAC
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    Originally posted by samael:
    <STRONG>thanks , i kinda though as much.... i brought one anyway , and built it and prompty fried the ic good learning experience though. what is a negative voltage ? i have seen it refered to , but is there any resource that will give me any answers? thanks
    jake</STRONG>
    There are a bunch of books that will help you learn the basics, The Art Of ELectronics is a good one, the ARRL Handbook is another good one. I would suggest getting both if you want to experiment with much electronics.

    A negitive voltage is just a "term"
    If you have a 1.5 volt battery and you connect the minus side to a wire and call it ground, the positive side would be 1.5 volts. If you have another battery and connect its plus to the others minus and then connect a wire to the new batterys minus, you now have -1.5 volts. So you have 2 batterys, and three wires comming out.
    It is the same idea with power supplies.

    ----[&gt;---------------[&gt;-----
    | | |
    -1.5 ground 1.5

    normally you would think that if you have two batterys, you would just have 3 volts.


    ----[&gt;---------------[&gt;-----
    | | |
    ground 1.5 3.0

    Hope this helps,

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  6. #6
    FLAC
    Join Date
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    Portland OR
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    Dangit! They killed all my spaces! Just imagine there are spaces bewteen the | wires.
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

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