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Old 29th October 2009, 10:41 PM   #2571
disco is offline disco  Netherlands
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Default ripple and noise filter

Here go two PSU Designer files. Notice the difference between shape and size of the ripple voltages. Chokes used are 50mH (0.2 ohm) common mode type. The small resistors are used to drop some voltage, secondary Rdc is guessed. Enjoy.
Attached Images
File Type: gif 36V--psu.GIF (9.3 KB, 241 views)
Attached Files
File Type: zip examples.zip (443 Bytes, 38 views)
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Last edited by disco; 29th October 2009 at 10:50 PM.
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Old 29th October 2009, 10:44 PM   #2572
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HI disco ,Thorsten use CMC a lot on filament....

Ricardo the rk look better, needing Salas ok

Last edited by nicoch58; 29th October 2009 at 10:48 PM.
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Old 29th October 2009, 10:58 PM   #2573
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what difference between shape !
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Old 29th October 2009, 11:15 PM   #2574
disco is offline disco  Netherlands
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Without sophisticated test equipment it's a rather theoretical matter but on tube amplifiers the difference can be heard.
The Simplistic Regulator is very good. This little help might get your results a little further, as we are amplifying small signals with SE stages. I haven't listened without the CM filter but I can imagine it removes to a small extent the artifacts from the reproduction.
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Old 30th October 2009, 07:50 AM   #2575
le´flu is offline le´flu  Germany
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Hi Disco,
could you please send farnell ordering number for cmc?
I can´t find them in german....
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Old 30th October 2009, 02:35 PM   #2576
massimo is offline massimo  Italy
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Quote:
Originally Posted by le´flu View Post
Hi Disco,
could you please send farnell ordering number for cmc?
I can´t find them in german....
Yes, please Disco, tell us more. Possibly even the diode type.

Ricardo, at this point I no longer need a 30 + 30 V AC Xfrm, but an higher one to get the desired 42 V DC for the hi gain riaa. More trouble.....

I checked the Block toroid: the RT series (single 230 V pri.) specs look slight better than the RK (dual 115 V pri.) and it should be slightly cheaper.
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Old 30th October 2009, 02:45 PM   #2577
massimo is offline massimo  Italy
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My second take on mirrored pcbs for Universal Phono Shunt v1.1....
Again, comments welcomed!
Now the layout is more compact and critical tracks are much shorter. Unfortunately there's a fat jumper underneath to return source to gnd (see arrows), but I don't think it will hurt that much.
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File Type: pdf UniPhShunt2.pdf (18.3 KB, 73 views)
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Old 30th October 2009, 03:26 PM   #2578
RCruz is offline RCruz  Switzerland
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Hi massimo

Thank you for the TX tip.

Very nice work in the pcb.... I will wait until you implement it before I have another go

I had some instability issues maybe due to the low voltage psu I am using.


Ricardo

Last edited by RCruz; 30th October 2009 at 03:28 PM.
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Old 30th October 2009, 03:36 PM   #2579
massimo is offline massimo  Italy
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If Farnell doesn't carry the RT series, Distrelec does.
Price differences: in Portugal F. prices the RX100/30 39.35 € + xx%Vat, in Italy 42.43 + 20%Vat
Distrelec here is much more expensive: 67,80 € + Vat for the same product! RT100/30 costs 50.70 € + Vat.

I would like to build the high gain Riaa (pcbs will follows), thus Vout must be 35V, but if I implement the filter suggested by Disco, I need a 35 + 35 VAC Xfrm. That means I must have it done on special order.
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Old 30th October 2009, 04:42 PM   #2580
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guys remember that Joh curl, Ayre and Jocko Homo
don't use ring trafo because don't filter the dirty AC as wide band device.....!!!

the hammond in my phono sound better then talema ring , and peter daniel as quite critic in the component selection use the hammond split coil in the Dac....

Last edited by nicoch58; 30th October 2009 at 04:49 PM.
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