Building a symmetrical psu B1 buffer - Page 240 - diyAudio
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 5th February 2012, 03:05 PM   #2391
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
The only problem that I am having with the Toner Transfer method is that I have whiskers between tracks that I have to get rid of.

The photo etch process, IMHO, is far more accurate.
  Reply With Quote
Old 5th February 2012, 03:26 PM   #2392
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by KatieandDad View Post
Looking at POST 138 you are using traffic lights to acurately produce the reference voltages - Am I right in this assumption ?
You mean the pictures of the black original boards in post 138 I guess. Yes some combine colors. Try 9.4V total, the old ones had an additional drop of a 10R that boosted the 9V a bit. No sinks low Id build that one. Easy to squeeze in crowded box.
Attached Images
File Type: jpg MezGru.jpg (169.2 KB, 289 views)
  Reply With Quote
Old 5th February 2012, 03:47 PM   #2393
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by KatieandDad View Post
I've been busy measuring my collection of LEDs - well the 3mm RED and GREEN ones.
I reckon that the best match that I can get for 9V and 5V4 is as follows.
9V = RED RED RED GREEN GREEN. (1.61+1.62+1.61+2.08+2.08 = 9V0)
5V4 = RED RED GREEN. (1.63+1.63+2.11 = 5V37)
I can then match both strings to within 10mV of each other and the target voltage.
Is that sufficiently accurate ?
How did you measure those? This is the best method to measure near real circuit operating conditions:
Attached Images
File Type: gif MeasLED.gif (20.6 KB, 282 views)
  Reply With Quote
Old 6th February 2012, 08:11 PM   #2394
tommy_o is offline tommy_o  United States
diyAudio Member
 
Join Date: Oct 2009
Hey there, I am just starting to source components and wanted to double check the transformer selection before proceeding. Is an Antek AN-0515 appropriate? Specs read 15V and 50VA, but I can't tell if it is 15+0+15 or not (or if I should be using a different product altogether). Link is here .

Or does anyone know of a more logical transformer choice (lower the price, the better; for someone in USA).
  Reply With Quote
Old 6th February 2012, 08:14 PM   #2395
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
The link says two outputs so it should be 0-15;0-15. You would just need to common the two centre wires to make 15-0-15 to connect to the pcb. 50VA is fine if you want to go down the hotrod line.
  Reply With Quote
Old 6th February 2012, 08:15 PM   #2396
tommy_o is offline tommy_o  United States
diyAudio Member
 
Join Date: Oct 2009
Quote:
Originally Posted by Marra View Post
The link says two outputs so it should be 0-15;0-15. You would just need to common the two centre wires to make 15-0-15 to connect to the pcb.
Great, thanks Marra!
  Reply With Quote
Old 7th February 2012, 03:16 PM   #2397
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Quote:
Originally Posted by Salas View Post
How did you measure those? This is the best method to measure near real circuit operating conditions:
I used a 5V regulated supply and a series 330R resistor to simulate a 10mA current.

I thought that would be accurate enough.

I've just sourced a pair of 0-15 0-15 50VA toroids. I only need one so I've put the other on Swap-Meet.
  Reply With Quote
Old 7th February 2012, 04:20 PM   #2398
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Any benefir to using v rated parts in dcb1?
  Reply With Quote
Old 7th February 2012, 04:27 PM   #2399
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Quote:
Originally Posted by buzzforb View Post
Any benefir to using v rated parts in dcb1?
I've heard of V rated tyres for cars but never V rated components ???
  Reply With Quote
Old 7th February 2012, 04:41 PM   #2400
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by KatieandDad View Post
I used a 5V regulated supply and a series 330R resistor to simulate a 10mA current.

I thought that would be accurate enough.
Not far.
  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 02:14 AM


New To Site? Need Help?

All times are GMT. The time now is 05:31 PM.


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