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

Solid State Talk all about solid state amplification.

Referenz - high-quality low-cost diy-friendly amplifier
Referenz - high-quality low-cost diy-friendly amplifier
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 7th January 2019, 03:29 PM   #11
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
It looks like Diptrace resized the drill holes. I had them all drawn at .025" for etching. Here are the corrected etching files.
Attached Files
File Type: pdf Input Mirrored.pdf (41.1 KB, 53 views)
File Type: pdf Input.pdf (41.1 KB, 34 views)
File Type: pdf Output mirrored.pdf (37.9 KB, 23 views)
File Type: pdf Output.pdf (38.0 KB, 33 views)
__________________
https://www.vzaudio.com/
  Reply With Quote
Old 7th January 2019, 03:58 PM   #12
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Oh i am too harry!
Attached Images
File Type: jpg IMG_20190107_180304.jpg (452.2 KB, 583 views)

Last edited by thimios; 7th January 2019 at 04:04 PM.
  Reply With Quote
Old 7th January 2019, 04:05 PM   #13
35101 is offline 35101
diyAudio Member
 
Join Date: Oct 2013
D3 in quasy scheme is not on place.

Last edited by 35101; 7th January 2019 at 04:09 PM.
  Reply With Quote
Old 7th January 2019, 04:28 PM   #14
ostripper is offline ostripper  United States
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
Originally Posted by vzaichenko View Post
The time has come to publish something really DIY-friendly

Please welcome Referenz - a relatively simple low-cost amplifier, utilizing current-mode amplification.
Low distortion, low noise. Power rating: 100W @ 8 ohm / 200W @ 4 ohm.
The amplifier consists of IPS module and OPS module.
Two OPS variants are included - complementary and quasi-complementary.
Both variants employ commonly-available inexpensive HexFETs.

It's not live-tested yet, so early adopters may face some amendments.
At the same time, some solutions used in this design are rather mature, being used earlier in the other designs.

Jeff has designed cool single-sided layouts.
Questions are welcome - the builds will be supported.

Cheers,
Valery

looks good , like my first CFA.


One comment , you chose to servo the low Z FB.
Have you tried either servo(ing) the CCS's or the high Z input.
Thimios did all 3. The high Z worked , 1M ohm Z load for the op-amp.
Servo FB to the CCS's also worked , but added more components.


PS- with especially an extreme input pair mismatch , the servo does
not have the "horsepower" to compensate the current FB node.
Servo FB is the "anal" way , since FB is independent of the audio paths.


OS
__________________
Wanderer - my travels.... Facebook - davyjones lockre -
  Reply With Quote
Old 7th January 2019, 05:00 PM   #15
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Hi Pete!
Glad to see you here!
Driled, not my best but still usable, i hope.
If changes, i hope some flying parts will do the job.
This time nothing works first time.
I haven't any photoresist remaining and the transperance not function well.
Attached Images
File Type: jpg IMG_20190107_185247.jpg (722.2 KB, 559 views)
  Reply With Quote
Old 7th January 2019, 07:10 PM   #16
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Referenz - high-quality low-cost diy-friendly amplifier
Quote:
Originally Posted by ostripper View Post
looks good , like my first CFA.


One comment , you chose to servo the low Z FB.
Have you tried either servo(ing) the CCS's or the high Z input.
Thimios did all 3. The high Z worked , 1M ohm Z load for the op-amp.
Servo FB to the CCS's also worked , but added more components.


PS- with especially an extreme input pair mismatch , the servo does
not have the "horsepower" to compensate the current FB node.
Servo FB is the "anal" way , since FB is independent of the audio paths.


OS
Hi Pete,

Thank you for the observation - the servo connection is actuallu a mistake
It happened when redrawing the schematic in Diptrace.
Jeff - we've got a problem

56K resistor has to be connected not to the low Z FB node, but to the high Z input (input pair's bases). This is an inverting servo, so it is intended for controlling the input, opposite the one with the feedback.

Thimios - sorry, you will need to cut the trace and reconnect the 56K resistor's lead.

Pete - I thought about driving the CCSs with the servo, but this design had a special requirement, driving my choices - it had to be as low-cost and low part count as possible (still showing very good sound quality characteristics).
Driving the high Z input with servo is a proven solution I used in the past. 56K resistor's value is chosen for having the overall input Z at the level of 27K (in parallel with 47K connected to ground).

We will upload the corrected files to the Post #1 soon

Cheers,
Valery
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/
  Reply With Quote
Old 7th January 2019, 07:14 PM   #17
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Referenz - high-quality low-cost diy-friendly amplifier
Quote:
Originally Posted by 35101 View Post
D3 in quasy scheme is not on place.
Emmm... please elaborate
Looking at the schematics I see it in the same place.
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/
  Reply With Quote
Old 7th January 2019, 08:59 PM   #18
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
I see the mistake in the servo connection now. That'll be a bit of an ugly jumper wire job to get that connected correctly! Wrong end of the board.

Yes D3 is in place on the Quasi board. Top left.
__________________
https://www.vzaudio.com/
  Reply With Quote
Old 8th January 2019, 09:05 AM   #19
35101 is offline 35101
diyAudio Member
 
Join Date: Oct 2013
UgsQ5=Ur27+Ud3
  Reply With Quote
Old 8th January 2019, 10:51 AM   #20
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Referenz - high-quality low-cost diy-friendly amplifier
Arrow UPDATED FILES

Here are the corrected files with all amendments implemented and etching-friendly pads on all the boards.
I will update post #1 as well, however, the system doesn't allow me updating the files there (only allowing updating the text).
Attached Images
File Type: jpg 01 Referenz Input Sch 1.2.jpg (129.8 KB, 432 views)
File Type: jpg 02 Referenz Output Sch 1.2.jpg (149.4 KB, 435 views)
File Type: jpg 03 Referenz Output Quazi Sch 1.2.jpg (154.8 KB, 414 views)
File Type: jpg 01 Referenz Input.JPG (66.6 KB, 161 views)
File Type: jpg 02 Referenz Output.JPG (441.8 KB, 81 views)
File Type: jpg 03 Referenz Output Quazi.JPG (96.7 KB, 79 views)
File Type: jpg @Referenz Loop Analysis.jpg (132.4 KB, 93 views)
Attached Files
File Type: zip Referenz Files 01 Corrected PDF.zip (349.7 KB, 46 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
http://vzaudio.com/
  Reply With Quote

Reply


Referenz - high-quality low-cost diy-friendly amplifierHide 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
A High-Quality, High-Power Headphone Amplifier gdan Headphone Systems 10 1st February 2016 02:08 PM
Where to order a high quality low cost SMT stencil? Fusion916 Solid State 5 29th November 2015 02:11 AM
Made in China,low cost,high quality,electronic components,power supply etc hang Vendor's Bazaar 1 16th September 2009 01:44 PM


New To Site? Need Help?

All times are GMT. The time now is 05:55 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki