AVR-Chat

James

I was referring to the "green" ground wire, not neutral - I'm planning on
using a 3-prong plug for the input - the hot and neutral run to the primary
on the transformer, but I'm confused about where the AC ground should go...

Should that AC ground be tied to the case and to the DC ground, or should
the DC ground be isolated from the AC ground?

Also, what about the shell of the transformer, should it be tied to AC
ground, DC ground, or both? This is for audio equipment (guitar effects) if
that makes any difference....

Randy

> -----Original Message-----
> From: James Washer [mailto:washer@trlp.com]
> Sent: Monday, January 24, 2005 1:24 AM
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] OT - Grounding Question
>
>
>
> I'm sure lots of folks will have lots to say about this... but
> let me just ask a question of you first.
>
> When you say "ground from the 100 VAC" do you mean "ground" or
> "neutral". i.e. Are you using a 3-pronged-ground-lug plug, or the
> more conventional two-pronged plug, which has no ground, only hot
> and neutral, and which may or may not be polarized(, and which,
> even if polarized, may be plugged into an outlet with hot and
> neutral reversed)
>
>  - jim
>
> On Mon, 24 Jan 2005 00:55:45 -0500
> "Randy & Zonya Ledyard" <rledyard@bigfoot.com> wrote:
>
> > Basic question about grounding here, couldn't find the answer on several
> > schematics I looked at, so I thought I'd ask it here, so the
> experts can set
> > me straight.
> >
> > I putting together a power supply for my son, to power several
> of his guitar
> > effects boxes, and I had a question about grounding.
> >
> > This is a basic transformer/diode bridge/7809 regulator with filter caps
> > circuit, running off 120 VAC (US)
> >
> > Do I connect the ground from the 110 VAC to the ground on the
> DC side? If
> > it's in a metal case, should the case be grounded to the 110
> VAC side also?