[sdiy] The Next Newbie Power Supply question...

[Rob Mantel]

The Next Newbie Power Supply question...Did you check if the power dist
board is ok? Measure the resistance between the inputs you connect your
wires from the ps to to see if it doesn't have a short somewhere (and maybe
double check if you are using the right inout connectors?). Also measure
between those connections and the case to see if something you used to mount
the board to the case maybe touches something its not supposed to.

Good luck,
Rob

----- Original Message -----
From: Rhen, Kris
To: 'SynthDIYmailinglist '
Sent: Monday, December 10, 2001 5:43 PM
Subject: [sdiy] The Next Newbie Power Supply question...


I've got a +-12v, +5v regulated power supply which is acting odd (or more
likely I just don't understand what's up with it).  Wired it up to take AC
through a standard plug, one of the non-ground leads goes through a fuse (in
this case a 1A fast-blow fuse, even though the supply goes to 1.5A I'll
never draw that much from it).  The other end of the fuse, as well as the
other non-ground lead from the input goes to the supply.  I take the ground
and connect it to the case as well as the GROUND output lead (of which it
has two)  Power it up as-is and its great, I get my +12v, -12v and +5v
relative to the ground just fine.
Now I run some wires from the GND, +5, +12 and -12 to a power dist board and
power it up with a switch on a power strip its plugged into.  Fuse blows
with a nice flashy lightshow.  I've gone through a couple of fuses like this
(note NO LOAD (Doepfer/As/AS modules) yet - and I won't until I understand
why they're blowing).  Note its outputs are
-12v   GND   +12v   +5v   +S   -S   GND
and I don't have the sensing hooked to anything.
Can anyone tell me (without shouting :-) why the fuse is blowing?  Again,
gotta learn somehow and you all have been great teachers.  Thanks again
KRIS


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