<div dir="ltr">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?<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 3, 2020 at 3:53 PM Michael E Caloroso <<a href="mailto:mec.forumreader@gmail.com">mec.forumreader@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Never connect earth to the CT of a transformer.<br>
<br>
At least here in the US, earth of a three prong AC plug should be<br>
connected to the metal chassis. Local circuit ground should be<br>
coupled to earth through a low resistance (IE 10ohm at least 1/2 watt)<br>
with a cap in parallel. That would be a better solution to reducing<br>
noise.<br>
<br>
MC<br>
<br>
On 7/3/20, Shawn Rakestraw <<a href="mailto:shawnrakestraw@gmail.com" target="_blank">shawnrakestraw@gmail.com</a>> wrote:<br>
> Some of you may remember helping me learn how to design some PCBs a few<br>
> months back. I have been using one of my homemade eurorack cases for a<br>
> while now. To refresh the idea, it is essentially an electronotes design<br>
> where a 24V center tapped transformer is regulated down to +12V and -12V.<br>
><br>
> My question is this - Should the ground pin of the power cord be connected<br>
> to the center tap of the transformer? Currently, I have it connected to the<br>
> "Earth" terminal of the power switch and it is also connected to the "Body"<br>
> of the transformer, but I have left the center tap "Floating".<br>
><br>
> After putting a Make Noise Pressure Points module into the case and<br>
> noticing what looks like a lot of noise on the signal, I think that maybe<br>
> the earth ground should connect to the center tap and floating ground.<br>
><br>
> Thanks for your advice.<br>
><br>
> - Shawn<br>
><br>
</blockquote></div>