AC Safety Questions

[Mark Amundson]

> In the interest of avoiding electrocuting myself...
> 
> I have bought a receptacle for a standard US AC line cord.  This
> receptacle is identical to that which one would find on a PC or a
> factory synth.  This jack has three prongs, the center of which is earth
> (it's marked with an "e" and the "ground" schematic symbol). I intend to
> connect this center prong to the ground buss of my power supply and also
> to connect the metal enclosure to the PS ground buss...
> 
> Is this okay overall?  I was planning to use a 1 amp (not slow blow)
> fuse. It all seems logical but that hasn't always worked for me in the
> past...  -Chris MacDonald

Your IEC connector scheme looks good. Bond the earth terminal to your
chassis first. Consider separating the power supply ground bus from the
chassis with a 100 ohm resistor to your IEC earth wire bond point. By
floating all control and audio connectors to signal (supply) ground
instead of chassis ground avoids all those nasty ground loop humming
problems. Star grounding your module supply ground returns helps too. I
am just scratching the surface on this topic.

Mark Amundson,