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Mains conditioning
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Richardl60 View Drop Down
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Points: 1475 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2017 at 6:44pm
Or you could try unplugging EVERTHING from your mains?
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Richardl60 View Drop Down
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Points: 1475 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2017 at 6:45pm
Or you could try unplugging EVERTHING from your mains? Any chance neighbours could be an issue?
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peterb View Drop Down
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Points: 354 		Post Options Post Options   Thanks (0) Thanks(0)   Quote peterb Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2017 at 6:53pm
A temporary spur would be less work!
Yes, could be a neighbour. We live in a rural spot, overhead supplies and lots of 'odd' wiring setups for the local farm and workshops, so a real possibility.
All of which made me lean to towards using a conditioner.
Peter
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Dual 505-1, Cyrus CD T, DIY 80W MosFet amp and PreAmp, 2xKEF 103.2
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Graham Slee View Drop Down
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2017 at 6:13am
78XX voltage regulators often produce that sort of pattern usually to a maximum of 3.5mV. What does your scope read?

(and 79XX)


Edited by Graham Slee - 05 Mar 2017 at 6:13am
That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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gwebster View Drop Down
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Points: 175 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gwebster Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2017 at 10:34am
I'm living down a lane in the middle of a country estate with long overhead power lines feeding all the properties within the estate and an electric fence right next to me. Phone lines down here have a constant whistle that Openreach says is "acceptable". In spite of all this extraneous noise on feeds into the house, my recently built DIY phono/pre/power is silent.

How is the power wired up from the PSU to the phono/pre and power amps? Correct routing of the power distribution (both ac and dc wiring) within the amps can make a huge difference.

    Use twisted wires for all the ac wiring within the amps,dc feeds to your circuit boards and signal connections between boards
    Keep ac wires away from the dc wiring. If it needs to cross dc wires, do it at right angles
    Keep dc wires as far away from the big decoupling caps as you can
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BackinBlack View Drop Down
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Points: 2139 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2017 at 11:55am
As Graham points out the noise is probably from the 78xx regulators. No amount of mains conditioning will remove this.
If I my point you in the direction of what I think is Grahams own solution, see https://www.hifisystemcomponents.com/forum/phono-preamp-project_topic745_page4.html.
The Genera is shown about half way down the page. Providing that your current draw is of the same order you should notice an improvement.

Happy soldering and ultimately listening,
Ian
Just listen, if it sounds good to you, enjoy it.
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Fatmangolf View Drop Down
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Points: 9695 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2017 at 12:25pm
I'd second Ian's steer towards Graham's solution.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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