Shunt or serie volume control - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 21st November 2008, 06:39 AM   #21
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
Quote:
Originally posted by Lumba Ogir
Nelson,
I have been doing that for years. Now, how far are you prepared to go?
Lumba, I have plans for a power amp based on my experience from the folded cascode headphone amp. I'll be using JFET/bipolar CFP in the input stage and maybe cascodes as well. SK170/SK246 as CCS to the LTP. Not sure about the current mirror. I'm quite happy with the folded cascode topology, so I think I go for that. I think I'll hang on to the diamond buffer output stage but with double EF. I've tried diode biased EF, but I don't like it as much as the diamond buffer. Since I know the importance of how the speakers return currents are handled, I'd like either a BTL or fully balanced amp.

Very nice amp Lumba, I'll bet it sounds absolutely fantastic. What output stage do you favor? I have a hunch you've already told me but I'm sorry I've forgotten it.
  Reply With Quote
Old 21st November 2008, 09:05 AM   #22
diyAudio Member
 
nelsonvandal's Avatar
 
Join Date: Nov 2006
Lumba, I've been reading some of your old posts. Your ideas about CFP bipolar/MOSFET output stage looks interesting. Could you please show an example of a low power amp with MOSFETs available from ELFA so I could do some experimenting.

And sorry to you others for this threadjacking.
  Reply With Quote
Old 21st November 2008, 09:08 AM   #23
Banned
 
Join Date: Apr 2005
Location: Stockholm
Nelson,
Quote:
I'll be using JFET/bipolar CFP in the input stage and maybe cascodes as well.
JFETs should always be cascoded in common source mode.
Quote:
SK170/SK246 as CCS to the LTP.
You will need at least 10mA.
Quote:
Not sure about the current mirror.
Check out the effect of R14 in your headphone amp.
Quote:
I'd like either a BTL or fully balanced amp.
No dirty ground as far as the eye can see.

Take your time to plan the topology in detail. We can discuss it later.
  Reply With Quote
Old 22nd November 2008, 09:56 PM   #24
maxpou is offline maxpou  Canada
diyAudio Member
 
maxpou's Avatar
 
Join Date: Apr 2006
Location: Québec
Hi Guys,
nobody can help me?
  Reply With Quote
Old 22nd November 2008, 10:03 PM   #25
Banned
 
Join Date: Apr 2005
Location: Stockholm
maxpou,
what was the question?
  Reply With Quote
Old 22nd November 2008, 10:25 PM   #26
maxpou is offline maxpou  Canada
diyAudio Member
 
maxpou's Avatar
 
Join Date: Apr 2006
Location: Québec
Hi Lumba,
look at post 13 and 20. Thank you! Maxpou
  Reply With Quote
Old 23rd November 2008, 01:23 AM   #27
Banned
 
Join Date: Apr 2005
Location: Stockholm
Maxpou,
maybe I`m not the right person to answer your question but I would be happy with the values provided by that program.
  Reply With Quote
Old 23rd November 2008, 02:49 AM   #28
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
You could leverage the best of both worlds and go with a ladder attenuator.

-David
  Reply With Quote
Old 23rd November 2008, 01:31 PM   #29
maxpou is offline maxpou  Canada
diyAudio Member
 
maxpou's Avatar
 
Join Date: Apr 2006
Location: Québec
Hi Dw8083,
the ladder and shunt attenuator it's not same thing? What's the difference? Thank you! Maxpou
  Reply With Quote
Old 23rd November 2008, 04:11 PM   #30
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
max,
you have not told us what attenuation steps you NEED to allow your system to operate at the levels you normally require.
Post 14.
__________________
regards Andrew T.
  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
Volume control on DVD player remote. Lose resolution at low volume? Circlotron Digital Source 2 10th June 2011 07:20 PM
What resistor and potentiometer values for GC shunt volume control? sharpi31 Chip Amps 2 20th September 2007 07:23 AM
remote control motorised control for volume pot/knob CharlesY Parts 0 25th July 2005 11:12 AM
Shunt volume controll (scaling the shunt resistors) Freddie Solid State 7 30th August 2001 09:47 PM


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