[sdiy] Quick Question about Grounding Power Supplies
vladoman at gmail.com
Fri Jul 3 22:47:37 CEST 2020
On 03.07.20 22:38, Shawn Rakestraw wrote:
> Thanks for the answers. Looks like I may have opened a sensitive topic.
> I guess with a 10 ohm resistor and cap it is pretty near the same as
> straight connected. What is the purpose of the resistor? Is it to act as
> a fuse in case of short?
I think the idea is to act as a high impedance in a 50Hz ground loop and
the cap is to let HF pass to GND unimpeded.
also of note:
> On Fri, Jul 3, 2020 at 3:53 PM Michael E Caloroso
> <mec.forumreader at gmail.com <mailto:mec.forumreader at gmail.com>> wrote:
> Never connect earth to the CT of a transformer.
> At least here in the US, earth of a three prong AC plug should be
> connected to the metal chassis. Local circuit ground should be
> coupled to earth through a low resistance (IE 10ohm at least 1/2 watt)
> with a cap in parallel. That would be a better solution to reducing
> On 7/3/20, Shawn Rakestraw <shawnrakestraw at gmail.com
> <mailto:shawnrakestraw at gmail.com>> wrote:
> > Some of you may remember helping me learn how to design some PCBs
> a few
> > months back. I have been using one of my homemade eurorack cases for a
> > while now. To refresh the idea, it is essentially an electronotes
> > where a 24V center tapped transformer is regulated down to +12V
> and -12V.
> > My question is this - Should the ground pin of the power cord be
> > to the center tap of the transformer? Currently, I have it
> connected to the
> > "Earth" terminal of the power switch and it is also connected to
> the "Body"
> > of the transformer, but I have left the center tap "Floating".
> > After putting a Make Noise Pressure Points module into the case and
> > noticing what looks like a lot of noise on the signal, I think
> that maybe
> > the earth ground should connect to the center tap and floating ground.
> > Thanks for your advice.
> > - Shawn
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