ss/chip amp hybrid? - 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 27th May 2010, 11:57 AM   #1
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Default ss/chip amp hybrid?

Hi guys,
is it possible to use chip amp for driver stage and mosfets for output stage?
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 27th May 2010, 01:47 PM   #2
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
one possibility is to use the floating ps output stage - allows low voltage op amps to control output transistors which give the full supply Vgain

Click the image to open in full size.

qsc and clones.... backwards amps

QSC and others have used the topology with an op amp front end

you could have A/DSL driver op amps directly driving the output mosfet gates with this topology - the entire amp's active circuitry could be op amps except for the output Q
  Reply With Quote
Old 28th May 2010, 04:39 PM   #3
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
Yes, build a Hafler TransNova with an opamp for the front end.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 29th May 2010, 09:13 AM   #4
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Hi Djk,
i did some digging but couldn't find any hafler schematic with op amp.Do you have one?
Thanks.
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 29th May 2010, 09:15 AM   #5
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Default hafler schematic?

Hi Djk,
i did some digging but couldn't find any hafler schematic with op amp.Do you have one?
Thanks.
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 29th May 2010, 12:17 PM   #6
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
lme49830 voltage amp & driver stage is designed specifically for a discrete MosFET output stage.
Makes for a pretty good hybrid of chip & discrete SS amplifier.
__________________
regards Andrew T.
  Reply With Quote
Old 29th May 2010, 04:09 PM   #7
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Hi Andrew,
that was my first option together with lm4702,but the drivers are not available here in Kenya.
I could easily replicate a pioneer car amp and add more mosfets though,but i couldn't find someone willing to have his dismantled.Does anyone have a pioneer car amp schematic?Pioneer parts are available.
In a country full of cheap china products,diy is the way to go,not even pioneer amps produce the power it claims! I need the power of several of them.
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 29th May 2010, 08:16 PM   #8
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
IMAGE

The opamp would connect to the junction of CR2, CR3, and replace the discrete driver circuit. Pull-up/pull-down resistors would be added to the ends of the bias string. Opamp uses inverting input, feed back is connected to the non-inverting input.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 30th May 2010, 09:11 AM   #9
diyAudio Member
 
Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Hallo Djk,
wow! Thanks man. That hafler schematic has such a neat output stage.
You mentioned pull-up/pull-down resistors,please explain that.
Sorry for all these questions,this is my first ss power amp.
Thanks again!
__________________
if there are no sparks,it probably doesn't work!
  Reply With Quote
Old 30th May 2010, 04:10 PM   #10
Shaun is offline Shaun  South Africa
diyAudio Member
 
Shaun's Avatar
 
Join Date: Aug 2001
Location: Cape Town, South Africa
Hi Xeclipse

Have you considered importing? Connexelectronics offers the components, PCBs and complete kits. See Class AB amps.
__________________
Shaun Onverwacht
|||||||||| DON'T PANIC ||||||||||
  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
Who has ever heard of RCA's HC1000 100W amp Hybrid Chip? smartx21 Chip Amps 11 1st August 2011 08:02 AM
ashok's tube/ss hybrid headphone amp needtubes Headphone Systems 39 7th September 2005 04:24 PM
Any designs for tube/chip hybrid guitar amp? leadbelly Instruments and Amps 5 24th November 2003 11:56 AM
Hybrid "SE Tube Amp Sound Style" Chip Amp idea ThorstenL Chip Amps 24 7th February 2003 06:41 AM
tube/ss hybrid mic preamp help! mwmitchell Solid State 0 4th August 2002 01:11 PM


New To Site? Need Help?

All times are GMT. The time now is 05:21 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