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 12th June 2018, 10:14 PM   #31
gwrskien is offline gwrskien  Norway
diyAudio Member
 
Join Date: Feb 2014
Location: skien
Simple High Performance DC Coupled Class A HPA with sub PPM THD
GB interest list:

Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Stellarelephant - 1 pair
passive420 - 1 pair
Pinnocchio - 1 pair
vvs7 - 1 pair
sarathssca - 1 pair
Gwrskien - 1 pair

By pair, it is meant a stereo integrated board. If you want qnty 2 of a stereo board, please indicated such.
  Reply With Quote
Old 12th June 2018, 10:30 PM   #32
xrk971 is online now 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
Ok this is starting to look much better in terms of interest. The design is still evolving and I just ordered the PSU components to test in a hand etched proto type to ensure the PSU meets the performance goals and works well and reliably.

If the PSU works, it might be a nice building block for a lot of different amplifiers. It gets away from all this linear transformer and shunt regulators etc that are trying to knock down 50Hz/60Hz in the audible band by -100dB or more. With switching supplies and cap multipliers, I have been able to get it to go down to the noise floor of the amp like a battery.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio

Last edited by xrk971; 12th June 2018 at 10:42 PM.
  Reply With Quote
Old 13th June 2018, 02:43 AM   #33
sarathssca is offline sarathssca  India
diyAudio Member
 
Join Date: May 2014
Quote:
Originally Posted by sarathssca View Post
Is the power supply given above reference doesn't meets the current requirement ? Is the filtering given there be ok or does it needs further filtering for low power requirements?
  Reply With Quote
Old 13th June 2018, 03:06 AM   #34
xrk971 is online now 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 sarathssca View Post
Is the power supply given above reference doesn't meets the current requirement ? Is the filtering given there be ok or does it needs further filtering for low power requirements?
So I looked at the PSU in the above article (shown here for convenience). I’m sure it works well too but really is not quite the same level of modern SOA implementation as my design which also uses a dual rail DC-DC step up (Traco THN15-1224) plus a TI LDO regulator with 4uV noise, plus a cap multiplier and a CRCRC filter. Basically everything thrown in for good measure. Although I will test first and se if a cap Mx is needed. The LS HPA PSU appears to use a MOSFET capacitance multiplier as well. I don’t know what current rating it is for but the one JPS64 and I are designing has max +/-315mA current and +/-24v which we can adjust from 23v down to whatever we need with programmable low dropout (LDO) voltage regulator TP7SA. Nominally 15v or 18v at 115mA to up to 300mA (for those with big heatsinks). Can accept 9v to 18v dc input and has 90% efficiency.
Attached Images
File Type: jpeg 005797F6-CBB2-4048-84C7-36A84F19C2A6.jpeg (95.2 KB, 256 views)
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio

Last edited by xrk971; 13th June 2018 at 03:08 AM.
  Reply With Quote
Old 13th June 2018, 03:16 AM   #35
yourownbuzz is offline yourownbuzz
diyAudio Member
 
Join Date: Mar 2017
I thought it fitting I came across this video this morning on youtube:

What goes on in a PCB factory
YouTube
  Reply With Quote
Old 13th June 2018, 03:56 AM   #36
yourownbuzz is offline yourownbuzz
diyAudio Member
 
Join Date: Mar 2017
Ok sounds like this thing is happening - in that case I'll wait for this PCB and get the AKSA preamp PCBs posted together if thats ok with you X?

Quote:
Originally Posted by xrk971 View Post
Ok this is starting to look much better in terms of interest. The design is still evolving and I just ordered the PSU components to test in a hand etched proto type to ensure the PSU meets the performance goals and works well and reliably.

If the PSU works, it might be a nice building block for a lot of different amplifiers. It gets away from all this linear transformer and shunt regulators etc that are trying to knock down 50Hz/60Hz in the audible band by -100dB or more. With switching supplies and cap multipliers, I have been able to get it to go down to the noise floor of the amp like a battery.
  Reply With Quote
Old 13th June 2018, 01:05 PM   #37
xrk971 is online now 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
I thought it fitting I came across this video this morning on youtube:

What goes on in a PCB factory
YouTube
Thanks for the link. I get a lot of boards from JLCPCB. Had no idea how many steps are involved and how spread out the factory is. Thatís $B worth of equipment to do what they do for $2 for 10 boards (2 layer 10cm). My boards nowadays cost a lot more since thick 2mm, double thick gold, ENIG finish. The integrated amp with PSU will be premium construction like this.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 13th June 2018, 04:39 PM   #38
xrk971 is online now 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
Latest from JPS64 now with selectable Xfeed, and also optional input cap coupling as user option connector on back of board.

Simple High Performance DC Coupled Class A HPA with sub PPM THD-fr4_complete_v1_top_6-xfeed-png
Attached Images
File Type: png FR4_complete_V1_top_6-with-Xfeed.png (734.2 KB, 731 views)
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 14th June 2018, 02:54 AM   #39
xrk971 is online now 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
More progress from JPS64. This is going to be one heck of feature rich amp. Notice the symmetry of the amp core. That’s how JPS64 says to keep noise down, one must “Think like an electron”, sung to the tune “Walk Like an Egyptian”.

Simple High Performance DC Coupled Class A HPA with sub PPM THD-f003b472-9e30-4be3-b438-7854c8e172b7-jpeg
Attached Images
File Type: jpeg F003B472-9E30-4BE3-B438-7854C8E172B7.jpeg (466.8 KB, 313 views)
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio

Last edited by xrk971; 14th June 2018 at 02:58 AM.
  Reply With Quote
Old 14th June 2018, 04:04 AM   #40
yourownbuzz is offline yourownbuzz
diyAudio Member
 
Join Date: Mar 2017
Would it be possible to have holes on the pcb for the switchcraft 3.5mm sockets as input and output?
  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 12:12 PM
High Performance Class A Current Feeback Headphone Amplifier monty78pig Headphone Systems 14 12th November 2015 02:01 PM
Simple High-Performance DAC psk Digital Line Level 17 8th September 2014 05:41 AM
simple, high performance amp using DRV134? Fast Eddie D Headphone Systems 6 6th May 2014 06:17 AM
Huginn, High performance, Class A, Lateral FET headphone amplifier Neutrality Headphone Systems 11 7th November 2013 08:29 PM


New To Site? Need Help?

All times are GMT. The time now is 12:02 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki