New amp design ? - 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 1st March 2006, 08:40 PM   #1
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
Default New amp design ?

Hello there

I have been working whit a new design (I think). It is a one stage amp. whit 0 dergree phaseshift, voltages gain and low output imp.

It sounds verry nicely, much like a single end tube amp. Please tell me what you think.

Regards
Attached Images
File Type: png frank40_amp1.png (45.4 KB, 1727 views)
  Reply With Quote
Old 1st March 2006, 09:56 PM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Perhaps I'm missing something, but Q1 and Q3 don't look to
actually be doing anything. Is there an error?
  Reply With Quote
Old 1st March 2006, 10:02 PM   #3
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Q1 and Q3 appear to try and affect the ground reference to the power supply. The resistor values seem to be off for this.

Either that or they just pump signal to ground to heat the heatsink.

-Chris
  Reply With Quote
Old 2nd March 2006, 06:29 AM   #4
JCM is offline JCM  United States
diyAudio Member
 
Join Date: Dec 2005
Location: Kansas USA


Edit : okay I see the ground is connected to the speaker through the 220 ohm resistor.

I'm still not sure what that pair does other than drive the 10 ohm resistor. That would stress the power supply. Not sure 5 watts is enough. I would think the effect would be dynamic range compression.

At this moment I am listening to my latest monstrosity, a 2 W / ch Zen-style source-follower amp. But in my memory, the Zen common source circuit sounded better. It seemed to effortlessly and happily give up music, and I had to drive it HARD, all 1 watt of it, to get it to sound bad. This one immediately sounded a little gritty to me, though I've gotten used to it.
  Reply With Quote
Old 2nd March 2006, 06:53 AM   #5
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Hi, Frank40,

It seems you build something like Crown's Grounded Bridge topology (like used in Crown MA600 or MA1200), where 1/2 power is used to modulate the supply ground (like Hafler's Transnova) + the other 1/2 half is working like normal power amp.

Quote:
It sounds verry nicely
So it is working? How about input impedance? Does it needs powerfull preamp to drive it?
  Reply With Quote
Old 2nd March 2006, 07:04 AM   #6
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
No erros, Q1 and Q3 whit R9-R12, Is the voltages gain currit.
  Reply With Quote
Old 2nd March 2006, 09:58 AM   #7
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Hi, Frank40,

Quote:
No erros, Q1 and Q3 whit R9-R12, Is the voltages gain currit.
My mistake then. You are not building Grounded Bridge topology
  Reply With Quote
Old 2nd March 2006, 03:55 PM   #8
Frank40 is offline Frank40  Denmark
diyAudio Member
 
Frank40's Avatar
 
Join Date: May 2004
Location: My workshop :-)
Well it dose work here is a pic. I vell get back to you explening
how it works.
Attached Images
File Type: jpg cap128.jpg (71.5 KB, 1287 views)
  Reply With Quote
Old 2nd March 2006, 08:54 PM   #9
Tom2 is offline Tom2  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Central CA
Voltage gain:

V(speaker)=V(in) * (1+ ( R12/R11) ) (approximately)

That is the way I see it. Interesting idea.

Tom
  Reply With Quote
Old 3rd March 2006, 12:59 AM   #10
diyAudio Moderator Emeritus
 
lumanauw's Avatar
 
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
Quote:
Voltage gain:

V(speaker)=V(in) * (1+ ( R12/R11) ) (approximately)
How do you get that? Could you describe how this works?

How many watts this amp gives? In what class, hot classA or cold classAB? Why R11 and R12 is 5watt rating, do they share all the speaker current? Does the supply stays rigid or modulated like Transnova?

Quote:
That is the way I see it. Interesting idea
You're right. If this is not Crown's Grounded Bridge topology or neither Hafler's Transnova, and works good audio, Frank40 could apply a patent for it
  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
Collated Design Criteria/dimensions for Ariel ML-TL Design talsius Full Range 1 13th October 2011 05:28 AM
Wilson Watt Puppy Clone Design - Design Review Please soundengine355 Multi-Way 8 15th August 2008 02:07 PM
4th order bandpass, wheel well design :) (design inside) TWOJZ Car Audio 28 13th January 2008 02:56 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 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