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.

Revisiting some "old" ideas from 1970's - IPS, OPS
Revisiting some "old" ideas from 1970's - IPS, OPS
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 9th November 2017, 07:19 PM   #2291
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Revisiting some "old" ideas from 1970's - IPS, OPS
For zeroing out the offset - adjust the value of R9 - if your trimmer, being at the lowest offset position, is showing zero value - decrease R9. If the trimmer shows its maximum value - increase R9.

Oscillation - possible. I always have an oscilloscope connected to the output of the amp on a test bench - you can see what's going on right away
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
https://www.vzaudio.com/
  Reply With Quote
Old 9th November 2017, 07:24 PM   #2292
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Quote:
Originally Posted by jwilhelm View Post
it would be better to work with the input in standalone mode until it's debugged, then figure out the output board issue. Doe DC offset move at all when adjusting R8? if so which way is the pot stopping at? Max or minimum? R9 needs to be changed sometimes. Valery says this is due to different forward voltage in different LEDs.
The output board haven't any issue as work well using all other IPS.
The offset trimmer isn't possible to zero the offset and i don't believe that do the job well.
Ok,i will reinstall the IPS using lamp,protective resistors and oscilloscope looking for a possible oscillations.
The offset problem is another story.

Last edited by thimios; 9th November 2017 at 07:32 PM.
  Reply With Quote
Old 9th November 2017, 07:57 PM   #2293
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
I have finally got TubSuMo squeezed onto an input board for the NS-OPS series amps.
Attached Images
File Type: jpg TubSuMo.jpg (151.9 KB, 299 views)
__________________
https://www.vzaudio.com/
  Reply With Quote
Old 9th November 2017, 08:01 PM   #2294
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Revisiting some "old" ideas from 1970's - IPS, OPS-tubsumo-jpg
Quote:
Originally Posted by jwilhelm View Post
I have finally got TubSuMo squeezed onto an input board for the NS-OPS series amps.
Good!
Another IPS to the family!
Attached Images
File Type: jpg TubSuMo.jpg (151.9 KB, 331 views)

Last edited by thimios; 9th November 2017 at 08:03 PM.
  Reply With Quote
Old 10th November 2017, 06:04 PM   #2295
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Revisiting some "old" ideas from 1970's - IPS, OPS-dsc09458-jpg
Testing the A-X Deluxe as stand alone IPS.
The offset problem solved using 390R//1K.
As i can't see other problem here i'm afraid that this IPS oscillate when connected to OPS.
Attached Images
File Type: jpg DSC09458.jpg (250.6 KB, 309 views)
File Type: jpg DSC09444.jpg (278.3 KB, 31 views)
File Type: jpg DSC09446.jpg (280.9 KB, 28 views)
File Type: jpg DSC09448.jpg (304.4 KB, 26 views)
File Type: jpg DSC09449.jpg (294.5 KB, 24 views)
File Type: jpg DSC09452.jpg (292.0 KB, 22 views)
File Type: jpg DSC09453.jpg (290.7 KB, 24 views)
File Type: jpg DSC09454.jpg (272.2 KB, 22 views)
File Type: jpg DSC09455.jpg (308.0 KB, 24 views)

Last edited by thimios; 10th November 2017 at 06:12 PM.
  Reply With Quote
Old 10th November 2017, 07:35 PM   #2296
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Revisiting some "old" ideas from 1970's - IPS, OPS
Looking pretty good.
You can add 47pF in parallel with R22, R23 for a safer test with OPS.
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
https://www.vzaudio.com/
  Reply With Quote
Old 11th November 2017, 05:56 AM   #2297
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Default A-X Deluxe

Revisiting some "old" ideas from 1970's - IPS, OPS-dsc09461-jpg
Arrested!
Amplifier oscillate at 56.5Mhz,see picture.
This measured without any load when input is open.
Attached Images
File Type: jpg DSC09461.jpg (299.4 KB, 262 views)
File Type: jpg DSC09460.jpg (310.9 KB, 45 views)

Last edited by thimios; 11th November 2017 at 06:14 AM.
  Reply With Quote
Old 11th November 2017, 06:44 AM   #2298
vzaichenko is offline vzaichenko  Russian Federation
diyAudio Member
 
vzaichenko's Avatar
 
Join Date: Jan 2010
Location: Moscow, Russia
Revisiting some "old" ideas from 1970's - IPS, OPS
OK - 450mV - not too "evil" )
No additional capacitors, mentioned in my previous post, right?
__________________
If you can't explain it simply, you don't understand it well enough (c) Albert Einstein
https://www.vzaudio.com/
  Reply With Quote
Old 11th November 2017, 06:49 AM   #2299
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Quote:
Originally Posted by vzaichenko View Post
OK - 450mV - not too "evil" )
No additional capacitors, mentioned in my previous post, right?
Right,47pf// to R22 R23 not added yet.BUT the lamp in series with transformer primary side and the protective resistors(instead of fuses) are in circuit.
I see 7v d.c on 18R/10W resistors.

Last edited by thimios; 11th November 2017 at 06:55 AM.
  Reply With Quote
Old 14th November 2017, 08:42 AM   #2300
thimios is offline thimios  Greece
diyAudio Member
 
Join Date: Aug 2009
Location: Agrinion
Default AX-Deluxe+NS

Revisiting some "old" ideas from 1970's - IPS, OPS-dsc09478-jpg
33pf trimmer// R22,R23.
This way amplifier is stable but i see a little warm zobel resistor even with sinusoidal at clipping levels.
Test conditions:+/-50V.
75.000uf/rail
22mA/Pair idle current.
R dummy=6R
980mV input, 26.6V RMS/6R=118W RMS out,or 176W/4R.Just before clipping.
-3db,2.5Hz-300Khz.
Attached Images
File Type: jpg DSC09528.jpg (277.0 KB, 33 views)
File Type: jpg DSC09529.jpg (297.8 KB, 17 views)
File Type: jpg DSC09532.jpg (266.7 KB, 19 views)
File Type: jpg DSC09478.jpg (311.9 KB, 182 views)
File Type: jpg DSC09533.jpg (272.0 KB, 28 views)
File Type: jpg DSC09534.jpg (275.1 KB, 20 views)

Last edited by thimios; 14th November 2017 at 09:09 AM.
  Reply With Quote

Reply


Revisiting some "old" ideas from 1970's - IPS, OPSHide 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
Looking for phase plug ideas for horn loaded 10" and 12" drivers Eva Multi-Way 10 11th December 2011 06:17 PM
Separate IPS and OPS boards? Neutrality Solid State 5 18th June 2011 09:40 AM
B200 in a OB with a added "twist". Ideas needed. Mattias S Full Range 4 29th November 2010 07:35 PM
Looking for a 1970"s Marshall Mark II schematic.. Minion Instruments and Amps 2 1st February 2009 05:48 PM
"Power Tracking" in supply, ever heard, DIY ideas? Cradle22 Solid State 19 4th June 2003 10:02 AM


New To Site? Need Help?

All times are GMT. The time now is 06:36 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki