Internal power supply and PSU mod

Discuss Yocto construction and related issues
  • hofmann25 wrote:
    jeroenbvo wrote:
    I have also connected the chassis ground to the PSU using a loop breaker intended to prevent earth/ ground loops to prevent hum when systems are interconnected.

    What 2 diodes did you use for the ground loop breaker jeroenbvo? :)

    1N4004's or 1n5818 or other schottky diodes?

    The reason I ask is because at the top you mention 1N4004's and on your blog you say the 1N5***'s http://imgur.com/a/IeBch#3

    Will this mod work for the Nava?

    To complete the existing half wave bridge rectifier, I've added two additional 1N4004's to make it a full bridge rectifier.

    The 1N5*** are used in the ground loop breaker.

    Your second image shows the way I did it. And yes this will work for the Nava too!
  • Thanks jeroenbvo ;)
  • Ok now I'm afraid to hook this up to 240v! :oops:

    I have one of these http://80.93.56.75/pdf/0/5/5/2/1/05521864.pdf http://catalog.triadmagnetics.com/item/ ... vpt30-1670
    I'm afraid I'll blow up the house/kill myself :?

    I wanna run 2x 15V 15VAC. And a center tap for earth.

    What are the input connections?

    [resize=780]https://s16.postimg.org/km8ztxdk5/IMG_2 ... 150016.jpg[/resize]

    [resize=780]https://s12.postimg.org/xattojme5/IMG_2 ... 150007.jpg[/resize]

    [resize=780]https://s17.postimg.org/ivi0odf5b/IMG_2 ... 151109.jpg[/resize]

    Input1: Series - BLUE and BROWN, Jumper GRAY to VIOLET
    Parallel - BLUE and BROWN, Jumper BLUE to VIOLET, GRAY to BROWN
    Output1:: Series - BLACK and YELLOW, Jumper RED to ORANGE
    Parallel - BLACK and YELLOW, Jumper BLACK to ORANGE, RED to YELLOW

    I don't get this. Is it INPUT: Blue = Negative, Brown = Positive & Just solder BLUE to VIOLET, GRAY to BROWN? What is earth?

    OUTPUT: Black = Negative, Yellow = 1x15v? The rest I'm confused...

    Can you help me with the exact connections?
  • Hi,

    Looking at the data sheet you want following, (I see you live in Australia, so 230V is the voltage, series will be the connection method):
    Primary side

    1) Connect Gray and Violet to each other and insulate the joint. You don't need it further on.
    2) Blue and Brown will go to your 230V input. It doesn't matter here which one goes where. But I see the colour coding is the same as in Europe so just connect Blue to Blue and Brown to Brown.

    Secondary

    This one you want in series as well, so you connect;
    1) Red to Orange, and this joint is now your 0V center tap which will be connected to the point between C90 and C91
    2) Black for example goes to D109
    3) Then Yellow will go to the center of your two added 1N4004's.

    Earth from 230V side goes straight to chassis. And that point is also where you hook up one side of the ground loop breaker.

    [resize=800]http://i.imgur.com/WcCdvyj.jpg[/resize]

    Thats it.

    Hope this helps

    Jeroen
  • Thanks so much for the swift reply! :)

    Primary;
    "Blue and Brown will go to your 230V input. It doesn't matter here which one goes where. But I see the colour coding is the same as in Europe so just connect Blue to Blue and Brown to Brown."

    Blue is negative and Brown is positive?

    Secondary;
    Red/Orange 0v
    Black negative
    Yellow 15v.

    Sorry for so any questions but 240v hurts! :shock:

    :oops:

    EDIT: also is the switch before or after the transformer?
  • hofmann25 wrote:Thanks so much for the swift reply! :)

    Primary;
    "Blue and Brown will go to your 230V input. It doesn't matter here which one goes where. But I see the colour coding is the same as in Europe so just connect Blue to Blue and Brown to Brown."

    Blue is negative and Brown is positive?

    Secondary;
    Red/Orange 0v
    Black negative
    Yellow 15v.

    Sorry for so any questions but 240v hurts! :shock:

    :oops:

    EDIT: also is the switch before or after the transformer?
    With AC there is no such thing as positive and negative. In most modern house installations the standard is (L) Live - Brown and (N) Neutral - Blue.
    For the transformer it doesn't really matter in fact as it is still AC.

    If the switch is rated for 240V, you can put it before the transformer on the (L) Brown wire.

    With regards to the secondary.
    Yes, the Red/Orange will be your 0V center tap.
    Both Black and Yellow will have 15V AC

    Remember we are still at the transformer before rectifying, so until there all is AC. (Which doesn't have + or -)

    Hope it helps.

    Test Tip: Just wire the transformer up out of the case and not connected to the Yocto. Insulate all 240V connections. Plug it in and with a multimeter (Set for AC) measure between Red/Orange and Black, you should have more or less 15V AC. Measure between Red/Orange and Yellow and again you will have more or less 15V AC.

    240V AC is indeed not to joke with, however if you take care and insulate all connections, there is no problem.
    Worst thing that can happen is you blow a fuse in your house, release some magic smoke and maybe get a little zapp. Happened a lot to me when I was young and still experimenting, still the usual anecdote for my mother to tell at birthday parties, after I screwed something up and left the house in darkness.. :mrgreen:

    Have a look at his videos, although he is crazy, you can learn a lot from him and he's still alive, however don't try this at home haha!

    https://www.youtube.com/watch?v=sI5Ftm1 ... freload=10[/video]
  • jeroenbvo you da man.

    Thanks so much for your help man. A true legend! 8-)

    I'm getting a run through on a Yocto before I try the Nava...

    Ok, so got the Primary all connected.
    But I'm getting 18.20V AC. Is that too high? :o
    Will I need to put a resistor in-between connections (Between secondary winding and PSU) or change some components in the PSU?
    EDIT I believe after alot of research that the NAVA/YOCTO PSU can deal with this 18.2VAC but I am yet to test it.

    Image

    Now secondary (Once I sort this 18.20V AC).

    - Red/Orange (0V) goes to the GND pad, where the sleeve of the connector was?
    "the twisted centertap goes to ground" I'm confused here :oops: http://imgur.com/a/IeBch#4
    OR (Between C5 & C 7 on YOCTO) (Between C 90 & C91 on NAVA) are these now the NEW connections for GND? This is my 1st main question. Do you have a photo of this connection?

    - Yellow (15v) to the twisted diodes I have installed full wave bridge.

    - Black (15v) to the 15v Pad where the Center pin of the connector was?

    Image

    Earth on my IEC socket goes to the chassis & my Ground Loop Breaker which connects to the GND plate on the main PSU Cable (See below image)?

    Image

    Lookin good! ;)

    EDIT: please enjoy this video ;) and thanks for the previous video. :lol:
  • So the 18.2 volt is what you measure when there is no load attached. This is perfectly normal, no need for resistors.

    Indeed the 0V centertap goes between C5 and C7 on the Yocto! (I'm into my Nava for the moment, so hence the mistake)

    Your pictures show the correct connections. Here is a detail of where I put the 2 additional 1N4004's

    [resize=800]http://i.imgur.com/L9xZona.jpg[/resize]
  • All sorted!

    Tested the PSU not connected to the main board. 5/15/0V!

    Will post photos when I get a glue gun for the biggg ass resistor! ;)

    Thanks jeroenbvo 8-)