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.

Quick simulation question
Quick simulation question
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
Thread Tools Search this Thread
Old 19th November 2019, 10:19 AM   #1
east electronics is offline east electronics  Greece
diyAudio Member
east electronics's Avatar
Join Date: Jan 2006
Location: Athens GREECE
Default Quick simulation question

i think most of us familiar with L10 amplifier see also schematic on picture

I have one application that I have primary rails of regulated supply to feed the first stages lets say up to the drivers and a lower rail very beefy to feed the output

Can one quick simulate for what is the maximum voltage to feed the input stage ?
Attached Images
File Type: jpg L10 amplifier.jpg (59.6 KB, 97 views)
  Reply With Quote
Old 19th November 2019, 01:24 PM   #2
sgrossklass is offline sgrossklass  Germany
diyAudio Member
Join Date: Nov 2004
Location: Germany
Ironically, this one cannot be determined by simulation (which rarely represents breakdown voltage accurately) but requires old-fashioned studying of datasheets instead. I think the 2SD667/2SB647 are the bottleneck, being Vceo = 80 V parts and having to swing almost rail to rail. So roughly +/- 40 V max, or +/-50 for 667A/647A. In the latter case a fault condition with the output pulled to V+ may still destroy Q6 (a 65 V part) and/or C4.
  Reply With Quote
Old 19th November 2019, 11:30 PM   #3
Ian Finch is offline Ian Finch  Australia
diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour, NSW
Vceo max. may vary between manufacturers. Some examples of 2SD667A/B647A appear to use the same die as 2SD669A/2SB649A (as for example, do BD139/BC639). http://www.secosgmbh.com/datasheet/p...OD/2SD667A.pdf

There are even standard T092 versions of 2SD669/B649 to add to the confusion. Even with datasheets, I would test the breakdown voltage before fitting.
If only I had listened....

Last edited by Ian Finch; 19th November 2019 at 11:34 PM.
  Reply With Quote


Quick simulation questionHide 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
Quick 'n dirty sub simulation? head_unit Subwoofers 2 30th January 2012 12:34 AM
IV Simulation Question PigletsDad Digital Source 1 7th April 2008 01:41 PM
Quick quick question ! guitvinny Pass Labs 6 7th February 2007 05:20 PM
simulation question schiller Multi-Way 13 6th September 2006 10:22 AM

New To Site? Need Help?

All times are GMT. The time now is 10:45 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio