Finally, an affordable CD Transport: the Shigaclone story - Page 725 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th May 2013, 12:58 AM   #7241
diyAudio Member
 
alphaigor's Avatar
 
Join Date: Jun 2008
Default bf245 digi-lampizator

Hi everyone,

This evening ,after few days of useless attempts to find verifications of the s/pdif improvements with implementation of Mr. Dietmar bf245 jfet digital buffer from Lampizator site I want to share my experience regarding this simple circuit.
The circuit consist of four resistances and one jfet and I encourage everyone to build it since it need only 10 minutes to build and implement it.I connected it directly to 12v gel battery without regulator and resistor are chip 0.6W generic metalfilms and the sound is much more credible than with my diy copper wire wound resistors L-pad used till today in combination with copper-cotton capacitors.I did not tried PI-pad suggested somewhere in the forum jet.
I will report ,if there will be improvements after the copper resistor will be ready to fit after I finish them.
All in all the music is ,as I stated earlier much more credible with less fatigue on long runs.The background silence is much darker and stereo picture and separation of the instruments are done in much cleaner way but not artificial.
I hope this can encourage anyone to try it since there are really little opinions about that circuit on the web and mostly are Lukas Fikus vilification of his work and I suspect the reason is the audio industry truth exposure made by him ,which not everyone likes.
Few years ago I tried tubed digital lampizator and I liked it very much but I was concentrated on transport construction and somehow forgotten it in the process so I decided to try the sand version again.I can tell that I don't want to go back L-pad route anymore.I feel that this doesn't sound only ''different'' from usual resistor solutions and will be able to tell you more after few days of listening ,if anyone is interested ,of course .
  Reply With Quote
Old 25th May 2013, 08:52 AM   #7242
diyAudio Member
 
uncle_leon's Avatar
 
Join Date: Jun 2007
Location: Czyżeminek, near Łdź
Quote:
Originally Posted by tonyptony View Post
Well, I have a few of the 50V STDs so I tried to sand down the leads. Jarek, I don't know how you may have done it but I got nowhere. So I snipped the leads down and soldered thinner leads that I snipped from one of the smaller 'lytics that I used. Worked great.
I use a Dremel tool for such things. If I didn't have it it, I would have soldered a thinner lead, just like you did.
__________________
Studio Zy - natural, hand-crafted components for hi-end audio.
"Dare to be different, and you may stumble upon something amazing."
  Reply With Quote
Old 25th May 2013, 11:56 AM   #7243
diyAudio Member
 
Join Date: Mar 2006
Location: New Jersey
I thought about that, but was worried that using a Dremel for that long would transfer too much heat up into the cap body.
  Reply With Quote
Old 26th May 2013, 02:07 AM   #7244
diyAudio Member
 
Join Date: Mar 2006
Location: New Jersey
My two 10V supplies are built for the P-A super-regs. I decided to post pics of one of them since it required a bit of special work. I started with Tibi's PS PCB but knew that I wanted to use my custom R-core transformer, which is not center tapped. So I had to turn Tibi's board into something that would support a full wave bridge rectifier. Pics below.

I made one very stupid mistake, however. I accidentally reversed the ripple reject cap which is across the adjust pin. I didn't realize this until I powered it up. Once I saw the Vout was not stable I pulled the power and looked things over. That's when I saw the mistake. I had to cut the old cap out and replace it (that's why the adjust cap is soldered on to the old leads). I hope that didn't damage the circuit.

Oh, you can see I added a bit of Kapton tape to one of the leads on the additional diodes. It was a little to close to the solder pad of the topside diode. Probably would have been fine but I wanted to be safe.

And yes, those are two of my very few remaing BGs doing the filtering work. You might notice that I had to fashion some leads to push out the output terminal block because of the diameter of the 1000uF job. I used the snipped off leads from the BG to do that.
Attached Images
File Type: jpg IMG_3311a.jpg (304.5 KB, 375 views)
File Type: jpg IMG_3313a.jpg (296.0 KB, 361 views)
File Type: jpg IMG_3314a.jpg (377.3 KB, 353 views)
File Type: jpg IMG_3315a.jpg (336.8 KB, 345 views)

Last edited by tonyptony; 26th May 2013 at 02:10 AM.
  Reply With Quote
Old 27th May 2013, 08:30 PM   #7245
diyAudio Member
 
Join Date: Mar 2006
Location: New Jersey
Default Tent Labs XO and C59

Tibi, in the schematic it looks like you're recommending a 1000pF silver mica when using the Tent XO, but there is no recommendation in the BOM. I looked on Digikey and the only SMD micas of that size are huge 2220 parts. Is there a SMD mica that you know of which will work in this location?
  Reply With Quote
Old 28th May 2013, 04:38 PM   #7246
tvicol is offline tvicol  Romania
vicol-audio.ro
diyAudio Member
 
tvicol's Avatar
 
Join Date: Jan 2005
Location: Bucharest
Send a message via Yahoo to tvicol Send a message via Skype™ to tvicol
Quote:
Originally Posted by tonyptony View Post
Tibi, in the schematic it looks like you're recommending a 1000pF silver mica when using the Tent XO, but there is no recommendation in the BOM. I looked on Digikey and the only SMD micas of that size are huge 2220 parts. Is there a SMD mica that you know of which will work in this location?
Look on Mouser, there must be more options.
You can use any value between 470pF to 1nF to decouple Tentlabs XCO.

Regards,
Tibi
  Reply With Quote
Old 28th May 2013, 11:39 PM   #7247
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
Guys we 've been talking about trying different types of caps on C8, but we have seem to have forgotten about its bypass C9 (as manamanam pointed to me....).

Has anyone tried removing it?

I am back to my 0.1uF FT-3 for C8 since the 0.012uF FT-1 seemed to make CD imperfections quite intolerable, despite the increase in detail.
So now I m wondering if I should remove the smd C9 and simply bypass the 0.1uF FT-3 C8 with the 0.012uF FT-1
__________________
Second harmonic and semi-sweet wine for everyone...
The DIY Tone! | Shigaclone
  Reply With Quote
Old 29th May 2013, 12:25 AM   #7248
diyAudio Member
 
Join Date: Mar 2006
Location: New Jersey
Quote:
Originally Posted by tvicol View Post
Look on Mouser, there must be more options.
You can use any value between 470pF to 1nF to decouple Tentlabs XCO.

Regards,
Tibi
Tibi, Mouser shows the same as Digikey. When I did a search by SMD size I found that the 1210 size (there are no 1206 SMD micas on the Mouser site) tops out at 430pF. The smallest 470pF is in a 1812 size.

Last edited by tonyptony; 29th May 2013 at 12:28 AM.
  Reply With Quote
Old 29th May 2013, 04:05 AM   #7249
pchw is offline pchw  United States
diyAudio Member
 
Join Date: Apr 2006
Location: Fremont, California
Quote:
Originally Posted by dimkasta View Post
Guys we 've been talking about trying different types of caps on C8, but we have seem to have forgotten about its bypass C9 (as manamanam pointed to me....).

Has anyone tried removing it?
C9 is connected to pin 11 of the LA9242M, the TA amplifier output pin. C8 is connected to pin 10, the tracking gain time constant setting pin. It doesn't look like a bypass. If you remove C9, pin 11 will connect to nothing.
__________________
- Fred -
  Reply With Quote
Old 29th May 2013, 07:14 AM   #7250
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
lol.... how the #@#^% did we miss that....
__________________
Second harmonic and semi-sweet wine for everyone...
The DIY Tone! | Shigaclone
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 09:04 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2