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Old 11th April 2012, 01:10 AM   #11
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Location: Lakewood, Ohio
"Legis" there are different types of AC power systems in different parts of the world. Where will this transformer be used?
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Old 11th April 2012, 08:09 AM   #12
Legis is online now Legis  Finland
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Originally Posted by Speedskater View Post
"Legis" there are different types of AC power systems in different parts of the world. Where will this transformer be used?
Hi Speedskater, EU 230V/50Hz.
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Old 14th September 2015, 09:18 AM   #13
JAY X is offline JAY X  Spain
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Hi Andrew!

I also get confused but i try to do it right...because most PSU designs show the secondary floating.

Lets see:

Supose we have a separated psu board to supply current to the audio boards.

AC inlet main ground (safety ground) to chassis. This is clear and mandatory.

TRANSFORMER SECONDARY (18-0-18): Establishes the 0v center tap.

The 0v point after the last rectifier capacitor... ¿¿must be linked to the chassis near or at the same point as the safety ground....???? ¿directly with a wire link? ¿or thru a capacitor? these are my questions....

¡Thank you for for your help!

Jay X
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Old 16th September 2015, 10:30 AM   #14
DF96 is offline DF96  England
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It is common to connect the circuit signal ground to the safety ground, but this should be done at one and only one point. The PSU output ground may or may not be the appropriate point. In any case, this connection should not use the same chassis point as the safety ground but may use a nearby point. I believe the reason for this is to reduce the risk of the safety ground being removed during faultfinding, and also to keep any fault currents away from the circuit.
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Old 16th September 2015, 05:07 PM   #15
JAY X is offline JAY X  Spain
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OK, it makes sense... now i see more clear!!.


Jay x
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