Question

dejanm · 5th January 2008, 01:38 PM

Hi,

Please take a look into this schematic:

http://www.arcdb.ws/LS25/ARC_LS25_schematic1.gif

It is Audio Research LS 25 ... looks just fine. But take a look into cap C15 (0,01) very near the output terminals. Can somebody explain to me the function of this cap ?

On bought sides it is conneted to the ground. Is it a cap that stands between two grounding points ?

SY · 5th January 2008, 02:13 PM

It bypasses the signal ground to chassis ground at high frequencies. That enables the chassis to provide shielding while still isolating the signal ground.

edit: C1-4 do the same thing on the input end.

Robert McLean · 5th January 2008, 02:14 PM

dejanm :
C15 is connecting signal ground to chassis ground. In other words connects from the ciruitry common bus bar or circuit card track or whatever this amp uses to the metal chassis. C1, C2, C3 and C4 do the same thing at the input.

Others may comment, but I am not sure if you want such a connection at both the input and the output. I thought it was more common just to have one.

dejanm · 5th January 2008, 05:27 PM

Quote:

Originally posted by SY
It bypasses the signal ground to chassis ground at high frequencies.

Even when it is by-passed with a piece of wire ?

5th January 2008, 01:38 PM	#1
dejanm diyAudio Member Join Date: Jul 2005 Location: Vienna	Question Hi, Please take a look into this schematic: http://www.arcdb.ws/LS25/ARC_LS25_schematic1.gif It is Audio Research LS 25 ... looks just fine. But take a look into cap C15 (0,01) very near the output terminals. Can somebody explain to me the function of this cap ? On bought sides it is conneted to the ground. Is it a cap that stands between two grounding points ?

5th January 2008, 02:13 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	It bypasses the signal ground to chassis ground at high frequencies. That enables the chassis to provide shielding while still isolating the signal ground. edit: C1-4 do the same thing on the input end. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

5th January 2008, 02:14 PM	#3
Robert McLean diyAudio Member Join Date: May 2005 Location: Stittsville, Ontario, Canada	dejanm : C15 is connecting signal ground to chassis ground. In other words connects from the ciruitry common bus bar or circuit card track or whatever this amp uses to the metal chassis. C1, C2, C3 and C4 do the same thing at the input. Others may comment, but I am not sure if you want such a connection at both the input and the output. I thought it was more common just to have one. __________________ Robert McLean

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