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 12th September 2005, 01:48 PM   #21
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
Where's the link to the pcb group buy?
__________________
Crazy Yankee.
  Reply With Quote
Old 12th September 2005, 02:32 PM   #22
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
Hi,


I was thinking about the knob…I like the idea of an amp having only two knobs, one marked as “Volume” and the other one as “Tone”. While we may have seen such a thing, now the “tone” control got a different character…

Just thinking….may it be that different positions of the knob will suit to a particular type of music? For example, I was experimenting with an Aleph current source on my ZEN V3. I installed a switch to disconnect the 1.5 K resistor, making it a CCS (switch off). I noticed that I preferred a constant current source while listening to easy music, or Jazz, while with Rock I preferred the Aleph current source (switch on). I even had an idea to connect a 1K ohm pot in series with 820 ohm resistor, so the range would be from 820-1820 Ohm, which should give me various percentage of AC gain….

By the way, I tried a 1.8 K resistor instead of 1.5 k. Did not like the sound. Returned to 1.5 K. Or none (switch off)...


Regards,

Vix
  Reply With Quote
Old 12th September 2005, 08:59 PM   #23
diyAudio Member
 
Join Date: Nov 2000
Default Question regarding PLH

Could there be a little mistake in the text under fig 8?

Quote:
Figure 8 shows .... through R1 and R2. The source of Q1 follows
the Gate inout signal and drives Q3 in Common Source mode (v..
Should this not read:

Figure 8 shows .... through R1 and R2. The source of Q1 follows
the Gate input signal and drives Q2 in Common Source
mode (v..

And as a result

Quote:
The Drain of Q1 delivers an inverted and amplified version of the
input signal to drive transistor Q2 in Common Drain mode (cur...
would read:

The Drain of Q1 delivers an inverted and amplified version of the
input signal to drive transistor Q3 in Common Drain mode
(cur...

Or am I missing something obvious?

Regards
  Reply With Quote
Old 12th September 2005, 09:42 PM   #24
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by Greg Erskine
I was just about to download the datasheet for the IRF244 and found it is now obsolete. I guess it may be still available for now.
It will work with just about any part. IRFP240's are a clean
replacement.
  Reply With Quote
Old 12th September 2005, 09:45 PM   #25
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by lumanauw
With this quality of "homework", you should be able to make commercial product from it (another FirstWatt maybe?), but you decided to put it as DIY project?
It might make a product, but I don't have to decide at this
moment, and it doesn't hurt me to put it out there in the
meantime.

  Reply With Quote
Old 12th September 2005, 09:49 PM   #26
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by Vix
On page 7 I read “ P1, R6 and C4 form a filter to take out power supply noise..." On the schematic (Fig. 8) it is C5?

Shall we dare to think what's gonna be next?
Right you are, and also the reference to P1 and R3 which should
be P3. Both are fixed, and Desmond is putting it up on

www.passdiy.com and it's also being sent to AudioXpress.

  Reply With Quote
Old 12th September 2005, 09:51 PM   #27
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Default Re: Question regarding PLH

Quote:
Originally posted by rtirion
Could there be a little mistake in the text under fig 8?
would read:

The Drain of Q1 delivers an inverted and amplified version of the
input signal to drive transistor Q3 in Common Drain mode
(cur...
Thanks. Missed that one too.

  Reply With Quote
Old 12th September 2005, 10:13 PM   #28
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Quote:
Originally posted by Nelson Pass

It will work with just about any part. IRFP240's are a clean
replacement.
Yippee! Sounds like I can use my IRFP044's...

Dennis
  Reply With Quote
Old 13th September 2005, 02:11 AM   #29
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Quote:
It might make a product, but I don't have to decide at this moment, and it doesn't hurt me to put it out there in the
meantime.
Right I forget to include a factor that a Nelson Pass have reached such an enlightment level, that his true customers will still buy authentic product, even the original schematic is floating around and they can built/buy the clone. The original gears have somekind of invincible thing that those who owns them is satisfied perfectly
  Reply With Quote
Old 13th September 2005, 02:26 AM   #30
tlf9999 is offline tlf9999  United States
Account Disabled
 
Join Date: May 2005
Location: none
Quote:
Originally posted by lumanauw
his true customers will still buy authentic product, even the original schematic is floating around and they can built/buy the clone.
maybe Nelson has done studies on his customers but who is a typical Pass customer?

I doubt DIYers account for a meaningful portion of his customer base.
  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 12:18 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