Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 9th March 2010, 09:13 PM   #1081
diyAudio Member
 
regiregi22's Avatar
 
Join Date: May 2009
Location: Madrid (Spain)
Quote:
Originally Posted by Algar_emi View Post
Just for information to some of you guys, I bought 100 led to match them for the Shunt Reg and out of the 100, this is what I got:

Led YEL, Mouser 593-VAOL-3HCE4
Tested using 9V supply, 1K resistor
DVM FLuke 87, 4-1/2 digits meter

Led-Vf QTY
1.91V = 5
1.92V = 1
1.93V = 32
1.94V = 53 (Most 1.936-1.937V)
1.95V = 8
1.96V = 2
It happens the same with my bag, it comes already matched, more or less.For the ones who haven't bought it yet these are good news, because they dont need to buy soooooo many leds.
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!
  Reply With Quote
Old 9th March 2010, 09:14 PM   #1082
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
yep, I think thats what we all got Sylvain! Too bloody consistent!


Anyway, tonight I swapped in some Bennic 4.7uF caps instead of the Carli caps. These caps sounded really good as output caps in my phonoclone - and I rolled quite a few. So, I'll let them run in for a little and see how they go. Next up after these are smaller value GE caps.

All caps so far are from Madisound.

Fran
Attached Images
File Type: jpg IMAG0042 copy.jpg (221.1 KB, 467 views)
  Reply With Quote
Old 9th March 2010, 09:19 PM   #1083
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
  Reply With Quote
Old 9th March 2010, 09:20 PM   #1084
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Regarding the cap mods suggestion (100uF, 5X Led) to be replaced with a MKT of MKP cap, did anyone try to install a small MKP bypass cap on the 100uF cap instead, soldered from the bottom for example?

Also, do you have the part number, manufacturer, etc, of the matching connectors that fits the Mesmerize Selector Switch PCB outline, (and the IN/OUT connectors as well)?

Last edited by Algar_emi; 9th March 2010 at 09:25 PM.
  Reply With Quote
Old 9th March 2010, 09:27 PM   #1085
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Also Woodturner-fran, I can see on your picture that you installed a jumper instead of one of the 5 led. What is the total 5X led voltage we are trying to reach as target?
  Reply With Quote
Old 9th March 2010, 09:36 PM   #1086
diyAudio Member
 
regiregi22's Avatar
 
Join Date: May 2009
Location: Madrid (Spain)
Quote:
Originally Posted by Algar_emi View Post
Also Woodturner-fran, I can see on your picture that you installed a jumper instead of one of the 5 led. What is the total 5X led voltage we are trying to reach as target?
And could you tell as woodturner, what values are your CCS (R1) resistors and how many voltage are dropping?
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!
  Reply With Quote
Old 9th March 2010, 09:49 PM   #1087
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Algar-emi:

in/out - I just used some old sockets from an old pcb and just pushed the wires into them. Very easy to remove that way - important on a tweakers board!! They are here:
mouser #575-113120

As regards using a bypass cap...eh nope - its just monkey see monkey do 'round here!

No jumper on the 5 x LEDs - I think what you're seeing is a much smaller LED that might look like a jumper cos of my crappy camera phone! I used all sorts of different LEDs to try and get the drop right. I think it was 9V for the 5 leds and 5.4V for the 3 LEDs we aimed for.


regiregi22: my resistors are 68//68//10 which I think works out at 7.2R. Voltage IIRC is about 1.6v and 1.9V which gives 230 and 270mA- have a look a few posts back and I link it to much earlier in the thread (post 1030)about page 102-104 i think).


Fran

Last edited by woodturner-fran; 9th March 2010 at 09:51 PM.
  Reply With Quote
Old 9th March 2010, 10:00 PM   #1088
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by Algar_emi View Post
Regarding the cap mods suggestion (100uF, 5X Led) to be replaced with a MKT of MKP cap, did anyone try to install a small MKP bypass cap on the 100uF cap instead, soldered from the bottom for example?
It will not take down chemical cap's distortion. Its not an ''instead'', it will alter ESR, and will have some other effect. Results are a mixed bag in my experience. Small good caps for there are the non celebrated PPS also, IMHO.
  Reply With Quote
Old 10th March 2010, 12:08 AM   #1089
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Thanks Salas, yes, I know that film caps always have lower distortion that electrolytic ones.
I have in stock some very nice MKT Vishay (Polyester, Digikey BC1626-ND), 1.5uF, 63V. I'll installed two in parallel for 3uF total each.
They are very small, and will fit nicely. No offense, but much nicer that the big ones I saw
I'll try that.

Still no part number for the Selection and In/Out connectors?

Thanks.

Last edited by Algar_emi; 10th March 2010 at 12:33 AM.
  Reply With Quote
Old 10th March 2010, 12:47 AM   #1090
diyAudio Member
 
Algar_emi's Avatar
 
Join Date: Oct 2002
Location: Canada, Qc
Here the caps installed.
Attached Images
File Type: jpg B1-Caps.jpg (188.2 KB, 450 views)
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
New-building of my B1 buffer Babowana Pass Labs 328 20th February 2010 01:14 AM


New To Site? Need Help?

All times are GMT. The time now is 10:05 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