[sdiy] My PSU...

[Tim Parkhurst]

>I saw on the unit itself I needed to cut 2 
>jumpers to get +-15V from it (did that), and that on the transformer 
>I need to connect jumpers 1&3, 2&4, so I guess I should do that with 
>a rather low gauge wire and heat-shrink the xformer connections, 
>right?... 

Absolutely correct, you're doing fine so far...

>It then says to put the AC at jumpers 1 and 4, is there a 
>specific order to do that in, or can either prong wire go to either 
>jumper?... 

No specific order here that I know of. However, if you ever need to use more
than one power supply to power your modules (hooking them up in parallel to
get more current, or if you needed an additional 5V supply maybe) then you
should make sure they are all hooked up in the same way. Also, make sure
you're reading the instructions correctly as far as hooking up 115VAC or
230VAC. Some power supplies will autodetect the mains voltage, but many have
different input connections depending on the AC input voltage.

>Next it says I need a "max current/fuse rating" of .75A, 
>so where does that go in the overall circuit from my outlet to 
>xformer?...

You need to put the fuses in line at the output of the power supply. Put one
in the +out line and another in the -out line.


>	Then on the circuit board there are 7 wire connectors (-OUT, 
>-S (with +S, COM, -S put together between these), +S, +OUT) what are 
>these for?... (I think the middle 3 are for remote sense, whatever 
>that is) What do I do with each one, cause there's not really 
>anything about those on the paper?... Another question is how to get 
>a ground connection; or is that simply a connection to the middle 3rd 
>prong on my outlet?...

-OUT is the negative supply line, +OUT is the positive supply line, COM is
the ground connection. Basically, remote sensing is used when the power
supply leads are very long and / or there is concern of a voltage drop. You
would attach leads from the end of the power supply leads (or the point
where the voltage drop would be the worst) and run them all the way back to
the +S and -S terminals. The power supply then monitors the voltage at these
terminals and adjusts the voltage at the +OUT and -OUT terminals to keep the
supply lines at the desired voltage. This is a bit of an oversimplification,
but that's basically what happens. In most cases, you just connect the +OUT
to the +S and the -OUT to the -S right at the supply. 

Hope this helps.

Tim Parkhurst 
Design Engineer

Silicon Bandwidth



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