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Old 28th November 2009, 08:55 PM   #121
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In my recent build, I tried to reduce the length of the chassis to match pre-cut tubing I'm using for DACs. Normally, phono stage requires at least 9.5" enclosure length. By placing amp board over the power supply I was able to reduce the required length to 8" only.

To prevent possible transformer influence, I used mu-metal shielding.
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Old 28th November 2009, 08:58 PM   #122
hayenc is offline hayenc  United States
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Yep, that's the one. Just did not look closely at the board.
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Old 28th November 2009, 09:12 PM   #123
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Since I use regular IEC inlet here, I also added a power switch. The front has slightly different arrangement than previously, with addition of ground post.
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Old 29th November 2009, 07:56 AM   #124
quan is offline quan  Australia
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Hi Peter , what fuse do you use?
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Old 29th November 2009, 07:19 PM   #125
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I use DK part# 507-1032
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Old 29th November 2009, 07:23 PM   #126
jleaman is offline jleaman  Belgium
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Looks really good Peter,

One question, how come you have the power at one end and rca's at the other ? Wouldn't it look better if it was all on one side and a nice little Green power led on the front ? I know your trying to isolate the ac from dc and noise and interference right ? However isn't that all removed from the equation because it's in a metal enclosure ? have you tried putting the transformer/psu in another box with a umbilical cord ?

Just some thoughts and questions i had

Looks nice and sexy tho, always admired your machine work.

J'
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Old 29th November 2009, 07:27 PM   #127
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For me, form follows the function, besides, with such small end panels I can't fit all on one side.

Yes, I've build units with separate supply and phono amp modules attached directly to TT, built into interconnect; it works even better this way.
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Old 1st December 2009, 01:39 PM   #128
2A3SET is offline 2A3SET  Canada
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Default Use LED as volt ref

Have you tried LED reference (normal one, not low current) instead of D11/D12?
I am using audio-gd shunt reg with VSPS.


Quote:
Originally Posted by Peter Daniel View Post
I had a chance today to do some careful comparisons with PS and as suggested earlier, I did remove C3/C4 across current source: the sound become noticeably better without those caps (less coloration). I also removed C5/C6 and further improvement was observed. I tried without C9/C10 as well, but circuit actually sounded better with those caps in place. Nichicon FG was preferred here over BG STD, something I suspected already. BG N 10-47uF could be another good choice, although not that much better than FG.

I also did some testing with constant current regulator types. I really liked the old production ON Semi, National was second, then the new production ON Semi while Linear Technology LT317 was the worst; nice sound but too technical, ON Semi was OTOH much more musical.

Attached is updated PS schematic.
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Old 1st December 2009, 04:08 PM   #129
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I might try it this week.
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Old 1st December 2009, 07:36 PM   #130
jormajj is offline jormajj  Finland
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Hi,
the PCBs and parts kit arrived today. Thanks Peter
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