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Old 1st November 2008, 07:51 PM   #11121
RCruz is offline RCruz  Switzerland
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Default DECODER PSU

Hi everybody.....

I just finished and installed a decoder psu. After a long study and the input I received from all of you, here are my final choices:

2x9V 7VA TX

4x hexfred + 2200uF Pana FC + LM340AT-5 for the digital rails Pin 15 and 44. (this one decoupled with a 220uF ZA)

4x hexfred + 2 x 470uF BG std + 2x LM340AT-5, (one reg for pin 11 decoupled with a 220uF BG std and the other reg for the HF/RF on R505 also decoupled with a 220uF BG std on C504)

I used Brentīs wonderfull psu pcbīs.... this made everything faster and fuss free.

I must wait for everything to settle but I can already hear some very important changes: Attack on acoustic string instruments like guitar or bass is much faster.

I can now hear more detail in the metal dishes of the drums.

Bass is fullbodyied and powerfull but with more edge attack.

Hope the burning will integrate everything again and bring female voice back to normal sweet state (now a bit edgy).

But the best difference is in the size of the soundstage... now it is almost on par with the TT. (I believe that the subliminar high freq info, now aparent, helps a lot in recreating a vivid, focused and life size sound presentation.) (Simon - as usual you were right).

Once more I did it succefully at first time... I seem to be getting good at this...

Ricardo
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Old 1st November 2008, 08:15 PM   #11122
Luke is offline Luke  New Zealand
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Hi Ricardo,

whats the LM340AT-5 about? From looking at the datasheets they look like an indestructible 7805. do they sound better or do you just happen to have a few?
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Old 1st November 2008, 08:24 PM   #11123
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Luke
Hi Ricardo,

whats the LM340AT-5 about? From looking at the datasheets they look like an indestructible 7805. do they sound better or do you just happen to have a few?
They sound much much better.... almost as good as the 317.

Here are some pics:
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File Type: jpg p1010037 final glueing (small).jpg (70.5 KB, 235 views)
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Old 1st November 2008, 08:26 PM   #11124
RCruz is offline RCruz  Switzerland
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Anothe pic...
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File Type: jpg p1010034 analog psu (small).jpg (57.7 KB, 232 views)
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Old 1st November 2008, 08:30 PM   #11125
Luke is offline Luke  New Zealand
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I might try some. Thats a nice board, are the to220 packages rectifiers?
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Old 1st November 2008, 08:34 PM   #11126
RCruz is offline RCruz  Switzerland
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Final overview:

6 TX (9 independent psuīs)

12 regs (3 spowers + 3 srayregs + 5 LM340AT + 1 stock 79M18)

2 x clocks (Dac and Servo)

Sound is awesome
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File Type: jpg p1010045 overview (small).jpg (73.2 KB, 459 views)
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Old 1st November 2008, 09:24 PM   #11127
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Luke
I might try some. Thats a nice board, are the to220 packages rectifiers?
Yes TO220.

You must choose the LM340 (AT) version.

Much better ripple rejection.... of course I am saving for some spowers.... but thatīs another story.

Soundstage is becoming so big now....
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Old 1st November 2008, 10:20 PM   #11128
hotiron is offline hotiron  Scotland
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Quote:
Originally posted by RCruz
Final overview:

6 TX (9 independent psuīs)

12 regs (3 spowers + 3 srayregs + 5 LM340AT + 1 stock 79M18)

2 x clocks (Dac and Servo)

Sound is awesome



Jees Ricardo How do you manage to get the board out and back without
breaking it!!!!
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Old 1st November 2008, 11:15 PM   #11129
Luke is offline Luke  New Zealand
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Quote:
12 regs (3 spowers + 3 srayregs + 5 LM340AT + 1 stock 79M18)
one of these things is not like the other......
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Old 2nd November 2008, 04:28 PM   #11130
SimontY is offline SimontY  United Kingdom
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Ricardo, you've done some stunning work there, you must be very proud!

I've been busy this weekend, working on things to bring other areas closer to my CD63

Simon
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