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Old 21st April 2009, 10:29 PM   #71
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Default A HA (heatsinks for rectifiers)

I seem to always forget that the leads can be bent!!!

Thanks for the photo.
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Old 21st April 2009, 11:55 PM   #72
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Payment sent for another stereo pair Peter, bloody hell I'm going to be busy the next little while.....
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Old 22nd April 2009, 06:54 AM   #73
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Peter
would you please advise best way to do gnd connections using your F5 pcbs
I ask because I got ground loop issue although no connection on input and even using just one amp pcb
my setup - gnd Input from rca - gnd pad of F5 pcb
rails gnd pad of F5 pcb Is fed from gnd of PSU filter which can be seen with yellow wire
brown wire goes to gnd binding post

http://www.diyaudio.com/forums/attac...amp=1240254247
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Old 22nd April 2009, 10:29 PM   #74
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Default Is there a need for "matching" rectifiers?

Peter,

Now for another question:
there was something said about matching rectifier diodes for bridges-
is this worth the trouble AND
can one do this with a multimeter?

I "measured" a few with my multimeter on the diode setting and could not get a repeatable value.

If this is a good idea would you recommend a method?

AS ALWAYS,
Thanks,
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Old 22nd April 2009, 11:45 PM   #75
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I don't think this is worth pursuing. If the diodes come from a same packaging, chances are they are pretty well matched anyway. I never match diodes.

Quote:
Originally posted by samoloko
Peter
would you please advise best way to do gnd connections using your F5 pcbs
There is basically only one way to do it and it shouldn't produce any ground loops:
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Old 23rd April 2009, 06:53 AM   #76
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thx Peter
I have connected as you post but there Is buzz
when short input to gnd - buzz disappear
If It Is not a problem would you tell how you have connected your setup from previous post - the filter caps that are not mounted at PSU board
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Old 23rd April 2009, 02:49 PM   #77
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Maybe you could post a picture of your setup?

The missing parts in my previous schematic are rectifiers which are connected as described here: http://www.diyaudio.com/forums/attac...amp=1239931785

The grounds from rectifiers go to the common point on filter caps.
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Old 23rd April 2009, 09:08 PM   #78
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here how I have connected gnd
from middle point of filter caps - 2 yellow wires - for amp gnd and for speaker
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Old 23rd April 2009, 10:11 PM   #79
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That is not exactly from middle of filter caps, you split the ground in two after grey wire "extention" . How about connecting both yellow wires directly to copper strips on filter caps?
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Old 24th April 2009, 06:50 AM   #80
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thx Peter

at first I had connected both yellow wires to the gnd of last filter cap
http://www.diyaudio.com/forums/showt...10#post1807410
but after Andrew T recommendation - one post ubove I did extension with gray wire
one last thing - I don't have safety network - I only experiment at that point
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