Revisiting some "old" ideas from 1970's - IPS, OPS - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 23rd July 2015, 07:07 PM   #21
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Arrow Update!

I have slightly updated the schematic and Jeff has designed a great layout for the beast. There is a trimmer for DC offset adjustment now.

R23 = 130R, VAS current = 5.5 mA, good for Slewmasters.
R23 = 47R, VAS current = 15mA, good for driving the MOSFETs directly (e.g. Tubsumo).
Attached Images
File Type: jpg @01-CDC-CCS-Sch-02.JPG (309.4 KB, 684 views)
File Type: jpg @01-CDC-CCS-x2D.JPG (193.1 KB, 643 views)
File Type: jpg @01-CDC-CCS-x3D.JPG (120.1 KB, 531 views)
File Type: jpg @01-CDC-CCS-z3D.JPG (48.3 KB, 501 views)
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
VIRTUAL ZERO distortion AUDIO
  Reply With Quote
Old 23rd July 2015, 07:15 PM   #22
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Quote:
Originally Posted by ostripper View Post
You have 5 comp. caps ? Lead /lag , miller , and a shunt ! How did you arrive at these ?

BTW , a very interesting "blameless" -mutant. I like the decoupled low voltage input and overload clamp.

OS
Each comp cap is responsible for particular part of the curve At the same time - most of them are rather small.

Key topology specialty - a "vertical" differential cascade, doing a lot of good things at once. The whole thing is going to be pretty fast for VFA
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
VIRTUAL ZERO distortion AUDIO
  Reply With Quote
Old 23rd July 2015, 07:42 PM   #23
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Quote:
Originally Posted by still4given View Post
Funny that we have to look back to the 70's to find really good amps. I'd say that is because stereos "mattered" back then. Having a great stereo was a status symbol and folks were willing to pay good money to impress their friends. Today they need to stuff 6 channels into a small box that will fit on a shelf under their flat screen.

How I remember going to the audio store and listening to Emerson, Lake and Palmer through a huge set of speakers and monster amps. Bass you could feel and mids and highs that seemed to come from every corner of the room. The store was filled with young men dreaming of owning that perfect "system". Those were the days! Great memories.
Yeah - those were the days ))
Well, in the end of the century there were some sort of "no compromise" designs as well. Just came across Sony TA-NR1 the other day. Imagine two Slewmaster power sections with 5 pairs of MT200 Sankens each, connected in parallel (PD+ to PD+, ND- to ND-, output to output), and biased to class A. This is just one channel Huge power supply. 47.5kg of metal. Monumental engineering
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
VIRTUAL ZERO distortion AUDIO
  Reply With Quote
Old 23rd July 2015, 07:48 PM   #24
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Quote:
Originally Posted by vzaichenko View Post
Yeah - those were the days ))
Well, in the end of the century there were some sort of "no compromise" designs as well. Just came across Sony TA-NR1 the other day. Imagine two Slewmaster power sections with 5 pairs of MT200 Sankens each, connected in parallel (PD+ to PD+, ND- to ND-, output to output), and biased to class A. This is just one channel Huge power supply. 47.5kg of metal. Monumental engineering
Those were the days when Sony's car audio was excellent as well. The old C90 was an incredible cd player. The tuners weren't very good though. 4 years later their flagship was worth $400 and sold in big box stores. That's a huge shift in engineering in a short time.
  Reply With Quote
Old 23rd July 2015, 08:08 PM   #25
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
Are you only planning to do a SMD version? I was hoping for a single sided "etchable" version.
  Reply With Quote
Old 23rd July 2015, 08:14 PM   #26
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Quote:
Originally Posted by still4given View Post
Are you only planning to do a SMD version? I was hoping for a single sided "etchable" version.
There are more coming. I'm going to do smd and through hole versions of both designs.
  Reply With Quote
Old 23rd July 2015, 08:40 PM   #27
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Quote:
Originally Posted by vzaichenko View Post
I have slightly updated the schematic and Jeff has designed a great layout for the beast. There is a trimmer for DC offset adjustment now.

R23 = 130R, VAS current = 5.5 mA, good for Slewmasters.
R23 = 47R, VAS current = 15mA, good for driving the MOSFETs directly (e.g. Tubsumo).
Can you double check the orientation of the VAS transistors? I think the 3D model is backwards in Diptrace. I think I have them installed correctly(ECB) but Diptrace is showing the metal side out.
  Reply With Quote
Old 23rd July 2015, 08:42 PM   #28
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Send a message via Skype™ to vzaichenko
Quote:
Originally Posted by jwilhelm View Post
Can you double check the orientation of the VAS transistors? I think the 3D model is backwards in Diptrace. I think I have them installed correctly(ECB) but Diptrace is showing the metal side out.
Yes, I have noticed that - 3D model is wrong. Your orientation is good.
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
VIRTUAL ZERO distortion AUDIO
  Reply With Quote
Old 23rd July 2015, 08:47 PM   #29
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
That might explain some messed up orientation in past designs.
  Reply With Quote
Old 23rd July 2015, 11:28 PM   #30
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Here's CDC-VFA-Boot in SMD.
Attached Images
File Type: png CDC-VFA-Boot Board.PNG (34.5 KB, 475 views)
File Type: png CDC-VFA-BOOT 3D.PNG (88.7 KB, 165 views)
  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
Looking for phase plug ideas for horn loaded 10" and 12" drivers Eva Multi-Way 10 11th December 2011 05:17 PM
Separate IPS and OPS boards? Neutrality Solid State 5 18th June 2011 08:40 AM
B200 in a OB with a added "twist". Ideas needed. Mattias S Full Range 4 29th November 2010 06:35 PM
Looking for a 1970"s Marshall Mark II schematic.. Minion Instruments and Amps 2 1st February 2009 04:48 PM
"Power Tracking" in supply, ever heard, DIY ideas? Cradle22 Solid State 19 4th June 2003 09:02 AM


New To Site? Need Help?

All times are GMT. The time now is 03:14 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki