B1 Buffer Preamp - Page 103 - 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 29th December 2008, 12:57 PM   #1021
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
Quote:
Originally posted by vonfilm

... B1 buit in a wooden cigar box.
... how to hook up the six poles of the DPDT switch ...?
Nice cigar box B1.

Attenuation connection as shown.

I wonder where the power supply connection is . . .


Cheers,

>><<
Attached Images
File Type: jpg b1 and ladder att.jpg (33.3 KB, 1686 views)
  Reply With Quote
Old 29th December 2008, 02:04 PM   #1022
vonfilm is offline vonfilm  United States
diyAudio Member
 
Join Date: Jun 2006
Babowana,
I have not yet added the DC jack. I intend to use a 18-24V AC-DC wallwort. Also I have not added the DPDT Switch to switch between the two inputs.

My biggest question right now is how to hook up the 6 poles of the DPDT switch to the 6 connections on the Pass-DIY PCB. Could someone enlighten me on this?
  Reply With Quote
Old 29th December 2008, 02:39 PM   #1023
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
the 4 fixed contacts are fed from the two 2channel sources.
The two moving contacts feed the L & R channels.
__________________
regards Andrew T.
  Reply With Quote
Old 29th December 2008, 05:17 PM   #1024
Evaas is offline Evaas  Canada
diyAudio Member
 
Evaas's Avatar
 
Join Date: Apr 2001
Location: Montreal QC
Default wall worts

I'm surprised by all the people using wall worts, or generally not discussing the power supply much. I don't have any experience playing around with power supplies for any line-level applications so i don't really know the effects. Is it really not that important? I did some searching in this thread and others (although I couldn't read all 50 pages) and couldn't find too much. Perhaps the current is so low that the regulators and filter caps are more than adequate for the job. is that the case? Is there really no audible difference to most people?
__________________
-roomatthebottom
  Reply With Quote
Old 29th December 2008, 07:15 PM   #1025
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
There is quite a bit of variety in off-the-shelf external supplies.

Digikey lists some pretty nice switchers, and places like Marlin
P. Jones will sell you a linear which will work pretty good. In
both case this presumes that you are at least doing some serious
filtering on-board.

  Reply With Quote
Old 29th December 2008, 07:26 PM   #1026
Evaas is offline Evaas  Canada
diyAudio Member
 
Evaas's Avatar
 
Join Date: Apr 2001
Location: Montreal QC
Quote:
Originally posted by Nelson Pass
There is quite a bit of variety in off-the-shelf external supplies.

Digikey lists some pretty nice switchers, and places like Marlin
P. Jones will sell you a linear which will work pretty good. In
both case this presumes that you are at least doing some serious
filtering on-board.


thanks for the tip! I definetly want to build a regulator so i can learn about it, but i may also try one of those supplies for comparison -- or so i don't have to wait as long to hear music .
__________________
-roomatthebottom
  Reply With Quote
Old 29th December 2008, 09:33 PM   #1027
vonfilm is offline vonfilm  United States
diyAudio Member
 
Join Date: Jun 2006
Andrew T,
Thank you for trying to answer my question. I am sorry to say that I don't understand what you mean.

My DPDT switch says 123 on one side and nothing on the other side. There are 6 poles on the bottom. On the Pass-DIY B1 board it say L1 and L2 with a blank connection in between, and it has a R1 and R2 with a blank connection in between. I was hoping that some one could tell me exactly where to make the connections. Like I said, I am sure that this is obvious to most of you, but it is not clear to me.

I have searched and googled this issue but I have been unable to find a clear explanation or diagram.
  Reply With Quote
Old 29th December 2008, 09:47 PM   #1028
hayenc is offline hayenc  United States
diyAudio Member
 
hayenc's Avatar
 
Join Date: Apr 2005
Location: Glendale, AZ
Send a message via Yahoo to hayenc
Looking at the bottom of the switch you see two rows of three pins. Let one row be right, the other left. Connect L1 to the left hand one, L2 to the right most one and middle to the middle. Same for the R1 and R2 pins.

Basically, the board layout is the same and the pins on the back of the switch. On a normal DPDT switch the handle position is the opposite of the pins on the bottom for contact.
  Reply With Quote
Old 29th December 2008, 10:29 PM   #1029
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
Quote:
Originally posted by vonfilm
Babowana,

Also I have not added the DPDT Switch to switch between the two inputs.


Sorry . . . I misunderstood . . .

  Reply With Quote
Old 30th December 2008, 11:26 AM   #1030
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
vonfilm,

Probably, this way . . .
In general, I use DMM having the short circuit test ("beep"-test) to find the right connections.

Good luck!

Attached Images
File Type: jpg dpdt toggle.jpg (33.4 KB, 2029 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
buffer/preamp? TheDriver41 Chip Amps 2 3rd October 2004 08:40 AM


New To Site? Need Help?

All times are GMT. The time now is 08:56 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