PCB Placement

Discussion in 'General Electronics Chat' started by Zeebit, Jan 18, 2014.

  1. Zeebit

    Thread Starter Member

    Nov 8, 2013
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    I plan on placing the regulator circuit of my PSU project above the transformer to save space and make it compact. There is about 0.7" of air gap between the top of the transformer and the bottom of the pcb.

    Transformer I'm using: http://www.ebay.com/itm/100W-220V-R-Core-Power-Transformer-Selectable-Values-/321220652796

    The pcb is just the old school single sided type.

    Here is the regulator circuit I built
    [​IMG]

    Will placing the pcb as stated above be okay? Won't there be interference or something?
     
  2. Zeebit

    Thread Starter Member

    Nov 8, 2013
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    I would appreciate it if someone knowledgeable could give me an answer. I need to know ASAP so that I can place an order for the enclosure and have it shipped out before the Chinese New Year.

    Thanks.
     
  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,669
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    I don´t think the position between the two matters. Just don´t forget to add a hefty heatsink on both the transistor and the regulator.
     
  4. Zeebit

    Thread Starter Member

    Nov 8, 2013
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    The LM317 only handles around 20mA so a tiny heatsink should do. I'll use a big sink and fan for the pass transistor.

    Thanks for the feedback. Just wanted to hear from the experts here. :)
     
  5. Zeebit

    Thread Starter Member

    Nov 8, 2013
    72
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    Just a follow up question. I don't want to create another thread just for this so I thought I'd just ask here.

    The traffo I'm using has two 12v-0v secondaries and I will series them and use a bridge rectifier to get a split rail output.

    I will be connecting the two winding like shown:
    Please ignore the wrong voltage.
    [​IMG]


    But since the traffo does not indicate which wire is 12 or which is 0, what would happen if I accidentally connect the winding in this manner? :
    [​IMG]
     
  6. t06afre

    AAC Fanatic!

    May 11, 2009
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  7. inwo

    Well-Known Member

    Nov 7, 2013
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    You will have only half wave supply on each supply.
     
  8. Zeebit

    Thread Starter Member

    Nov 8, 2013
    72
    0
    Is there a way to check with a voltmeter if I've wired it correctly (just the secondaries wired, no circuits connected)?

    Edit: NVM, found the answer. Thanks for the help guys.
     
    Last edited: Jan 18, 2014
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