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Old 2nd August 2012, 11:10 AM   #31
Puffin is offline Puffin  United Kingdom
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Signal grds are attached to pwr grd. It is a single rail supply.
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Old 2nd August 2012, 11:17 AM   #32
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Quote:
Originally Posted by Puffin View Post
Signal grds are attached to pwr grd. It is a single rail supply.
make a point under source resistor your central gnd

keep caps close to main circuit

post close up pics of your wiring when you make as I said , in case that you have some residual hum even then
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Old 2nd August 2012, 11:21 AM   #33
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Thanks Zen Mod. Will do it and let you know + pics.
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Old 3rd August 2012, 06:20 AM   #34
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make a point under source resistor your central gnd
Connecting the RCA (IN) grd in the way you suggest just shorts the input? But the hum stops.
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Old 3rd August 2012, 06:47 AM   #35
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what I meant is this
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File Type: png sch_ZCA.png (57.7 KB, 46 views)
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Old 3rd August 2012, 07:13 AM   #36
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Yes, this is correct.
What you basically have here is a one point grounding of important signal path areas. The hum should be greatly reduced as a result.

By the way, has anyone tried to build my high voltage version yet?
I would be very curious to hear your impressions on the difference between the standard circuit and the modified one. The input transformer really brings this amp to life!
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Old 3rd August 2012, 01:37 PM   #37
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what I meant is this
Are you able to apply the same grounding lines to this?

Click the image to open in full size.
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Old 3rd August 2012, 03:37 PM   #38
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Old 3rd August 2012, 05:38 PM   #39
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.
Thank you. I will try it tomorrow. We have the Olympics here to watch tonight.
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