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

Group Buys Members group buys

Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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 20th July 2018, 04:33 PM   #151
jwjarch is offline jwjarch  United States
diyAudio Member
 
jwjarch's Avatar
 
Join Date: Mar 2017
Location: San Leandro, CA
I'll double check those badboy, and edit if needed. I also have to add comments regarding transistor matching. For reference I have included tabs at the bottom of the spreadsheet that include the schematics, silkscreens, and renderings that JPS provided.

Here's the text from JP's schematic:
R115-R118 & R135-R138: 2R2 for 145mA bias; 2R7 for 115mA
R106/108 & R126/128 matched (or use 0.1% for performance)
V101/V102 & V121/V122 matched 1% (2mA) for best DC offset
V103/V104 & V123/V124 matched 5% for lowest DC offset

Last edited by jwjarch; 20th July 2018 at 04:45 PM.
  Reply With Quote
Old 21st July 2018, 07:21 AM   #152
yourownbuzz is offline yourownbuzz
diyAudio Member
 
Join Date: Mar 2017
X, any chance of posting the final schematic? the one on the first post is just one channel at the moment.
  Reply With Quote
Old 21st July 2018, 02:37 PM   #153
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Simple High Performance DC Coupled Class A HPA with sub PPM THD
Quote:
Originally Posted by yourownbuzz View Post
X, any chance of posting the final schematic? the one on the first post is just one channel at the moment.
Itís posted as PDF on post 96. All production data is there including stuffing guide and interconnect block diagram.

Simple High Performance DC Coupled Class A HPA with sub PPM THD

There is a typo on schematic: it says that MOSFETs can be substituted with Toshiba 2SK2013 and 2SJ3131. No 2SK2013 since all are P channel. Just 2SJ3131. Also, Fairchild equivalent FQP can be used too.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old Yesterday, 12:21 AM   #154
yourownbuzz is offline yourownbuzz
diyAudio Member
 
Join Date: Mar 2017
Oh, my mistake. Assumed it'd show up on the first post
  Reply With Quote
Old Yesterday, 01:09 AM   #155
xrk971 is offline xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Simple High Performance DC Coupled Class A HPA with sub PPM THD
I added a link to it from post #1.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote

Reply


Simple High Performance DC Coupled Class A HPA with sub PPM THDHide 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
Ultra-high performance, yet rather simple - hybrid and more! vzaichenko Solid State 998 13th June 2018 11:12 AM
High Performance Class A Current Feeback Headphone Amplifier monty78pig Headphone Systems 14 12th November 2015 01:01 PM
Simple High-Performance DAC psk Digital Line Level 17 8th September 2014 04:41 AM
simple, high performance amp using DRV134? Fast Eddie D Headphone Systems 6 6th May 2014 05:17 AM
Huginn, High performance, Class A, Lateral FET headphone amplifier Neutrality Headphone Systems 11 7th November 2013 07:29 PM


New To Site? Need Help?

All times are GMT. The time now is 12:36 AM.


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