Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

New project for 2018!
New project for 2018!
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 11th December 2017, 01:06 PM   #1
ygg-it is offline ygg-it  Italy
diyAudio Member
 
ygg-it's Avatar
 
Join Date: Feb 2008
Default New project for 2018!

Hello, I want to design and build an hi-fi amplifier made exclusively by parallel bipolar opamp (with a small output resistor each).

The idea is to put in parallel 40 dual opamps unity gain stable (which I like the sound, like LT1364 or AD826 or a mix between the two) and bias each of them in class A with FETs (a switch can exclude them to allow more current in class AB)

Each of them can issue 50 ma (in class AB) max.

I should get enough current to pilot 8 ohm at 10 Watt, dual channel.

Idea is crazy, but i want to go.
What do you think (please only technical comment/suggestion)....
  Reply With Quote
Old 11th December 2017, 03:11 PM   #2
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
It's been done...no need to reinvent the wheel.
  Reply With Quote
Old 11th December 2017, 03:48 PM   #3
djoffe is offline djoffe  United States
diyAudio Member
 
Join Date: Oct 2008
Default Here's the first part of Doug Self's Design Article

This links to a copy of the article...

https://www.google.com/url?sa=t&rct=...xOCv8mdy7wMACG
__________________
www.akitika.com Featuring the GT-102 Power Amp and PR-101 Preamp kits
www.updatemydynaco.com Featuring upgrades for classic Dynaco Solid State Equipment
  Reply With Quote
Old 11th December 2017, 04:25 PM   #4
ygg-it is offline ygg-it  Italy
diyAudio Member
 
ygg-it's Avatar
 
Join Date: Feb 2008
That's a good start, thanks!
  Reply With Quote
Old 11th December 2017, 10:06 PM   #5
tomchr is offline tomchr  Canada
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Calgary
It's been done with the LME49600 as well.

Tom
__________________
Modulus-86, 186, 286, 286 Kit, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
  Reply With Quote
Old 13th December 2017, 10:24 AM   #6
ygg-it is offline ygg-it  Italy
diyAudio Member
 
ygg-it's Avatar
 
Join Date: Feb 2008
Hello

a) Is better to parallel many amp at unity gain without feedback resistor (just a wire), or many amp at gain two like the datasheet shows by using 1K feedback resistor and 1K to ground from the negative input?

b) Is better to have some global feedback or set parallel colums with local feedback each? Or no feedback at all?

c) 5 ohm resistor is ok at the output of each opamp?
  Reply With Quote

Reply


New project for 2018!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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
The BiAmp (aka My LM4766 + 6p15p project, and LM1875 project.) valtra103 Chip Amps 21 4th December 2015 09:32 PM
Newby project idea for HND main project help and advice needed please WIGANWEZ Chip Amps 1 17th September 2011 05:59 PM
Newby project idea for HND main project help and advice needed please WIGANWEZ Chip Amps 0 17th September 2011 02:39 PM
CDPRO2 Group Project (open source project) BrianGT Digital Source 147 8th August 2008 12:37 PM


New To Site? Need Help?

All times are GMT. The time now is 11:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki