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Finally, an affordable CD Transport: the Shigaclone story
Finally, an affordable CD Transport: the Shigaclone story
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Old 27th April 2008, 06:00 PM   #671
Puffin is offline Puffin  United Kingdom
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Quote:
Originally posted by Puffin
Who said BG's take weeks to come on song !

Have been using mine as standard with a BNC out (no resistors)

Made it 75ohms last night, not bad, less glare and grain.

Having got my bits from Peter earlier in the week (with the caveat of "you don't neccessarily need them all") I thought I would attack it.

Removed R1 - R5

Substituted, E1, 10uf and E5 47uf for the BG's.

Well, bugger me, how good is that (30 mins on them at present) ! If they get any better then it's a bonus.

Now I've got to tread carefully as to any other substitute. I am going to leave the crystal as standard at present.


John. I have the rest of the stuff Peter sent me. Which other parts would you substitute ? I intend to leave the crystal as standard.
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Old 27th April 2008, 06:09 PM   #672
johnm is offline johnm  United Kingdom
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Everything I've done is here Puffin, but here it is in one place:

C934 - Black Gate N 4.7uF / 50V

C953 - Black Gate N 47uF / 50V

C929 - Black Gate N 4.7uF / 50V

C906 - Stick with original part.

C916 - Black Gate N 47uF / 50V

C939 - Black Gate N 47uF / 50V

C952 - Elna Silmic ARS 470uF / 63V

X901 - Stick with original.

Hope thats of help Puffin.

- J
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Old 27th April 2008, 06:37 PM   #673
Puffin is offline Puffin  United Kingdom
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John. Thanks. You were right, no 7808's at Craplin, they are "discontinued", such an odd value, can't have been any call for them ! Will have to go to Rapid, or use 7809's. Might try them and see what DC I get.
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Old 27th April 2008, 06:58 PM   #674
Peter Daniel is offline Peter Daniel  Canada
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If you need a regulator, I can send you replacement.

There is indeed something special about the original C906. I tried many caps in that position and some of them sounded certainly more impressive, but not neccessarily "right"
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Old 27th April 2008, 07:03 PM   #675
johnm is offline johnm  United Kingdom
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Yep exactly what I found - I liked the detail and immediacy of the Auricap, and - initially - loved the rich sound I got from the Jensen paper in oil.

However with the original part the sound just seems to 'relax' somehow and find it's own groove - its free to live and breathe! At the end of the day it just makes music sound real to me in a way the others didn't. Ditto for the crystal as well, at least with my ears and equipment
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Old 27th April 2008, 07:18 PM   #676
Puffin is offline Puffin  United Kingdom
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Peter. Thank you very much for your kind offer, but unless I draw a complete blank here in the U.K I would not ask you to send one all that way.

I am currently using a variable dc PS, and found that at 8v the CD didn't read properly. At 8.5v it is fine. So what about a 7809 ? Would it be o.k ?
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Old 27th April 2008, 07:43 PM   #677
Peter Daniel is offline Peter Daniel  Canada
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IIRC from the datasheet, the 9V is fine too.
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Old 27th April 2008, 08:18 PM   #678
r8833 is offline r8833  Canada
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hi guys

is it really critical to remove the smd caps on the bottom of the board ? I was planning on leaving those and just changing the caps on top
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Old 27th April 2008, 08:19 PM   #679
Peter Daniel is offline Peter Daniel  Canada
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No, it's not critical and you can leave them on board.
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Old 27th April 2008, 09:07 PM   #680
kevinkr is offline kevinkr  United States
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Finally, an affordable CD Transport: the Shigaclone story
Quote:
Originally posted by Puffin
John & Kevin. I am not normally this stupid and have made many succesful power supplies. It seems I cooked the reg with the 24v ! (no pops, no smoke - just a "silent and deadly", me thinks)

Why I thought 24v each side was right I'll never know.

I substituted a higher voltage reg (using a dual 12v tranny) and it works, but is of course too high DC.

Off to Maplin's tommorrow for some 7808's !
Lots of people still make the 7808, should not be too difficult to find someone who sells it besides Maplin... (Read your not so great experience with "Craplin" a couple of posts back.)

Don't feel too bad, hopefully you have read how I destroyed the micro-controller in my first board set.. No one could have been much stupider than me.
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