mj11015/16 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

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 February 2006, 06:51 PM   #1
diyAudio Member
 
Join Date: Sep 2005
Default mj11015/16

What is the maximum voltage(+/-) for those darlingtons?(i would use them in power amp


Thanx
  Reply With Quote
Old 23rd February 2006, 07:00 PM   #2
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi smokingmachine,
These are rated for 120 Vc-e, so supply rails of +-60 VDC would be right on the edge. I wouldn't go past 45 or 50 V on your supplies and that leaves very little room.

-Chris
  Reply With Quote
Old 23rd February 2006, 08:13 PM   #3
diyAudio Member
 
Join Date: Sep 2005
which one should i use than(i need bipolars for +- 80v----->90v)?

Are there any bipolars that would match mj11015/16 but that they are rated to higher voltage?
  Reply With Quote
Old 23rd February 2006, 08:19 PM   #4
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi smokingmachine,
Normally, one would use standard audio outputs like the MJ21195 and MJ21196. The collector current rating is lower. You would also use audio driver transistors, like another one of these. Note that you should be using 4 to 6 of these outputs per type for this output power. A large heatsink will be required.

Can you post the schematic you intend to use? There may be other issues at these high supply voltages.

-Chris
  Reply With Quote
Old 23rd February 2006, 09:14 PM   #5
diyAudio Member
 
Join Date: Sep 2005
I have schematic on a paper so I can not post it!I will try to do some photos and than posted it!!!

so there arent any bipolars that would be rated for +-85V?
  Reply With Quote
Old 23rd February 2006, 09:33 PM   #6
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
How many outputs do you think you need per channel?

How much power do you expect to get?

-Chris
  Reply With Quote
Old 24th February 2006, 04:42 AM   #7
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
Hi Smoking,

Here is a small list of outputs from On-Semi typically used for audio applications. It is a .xls file, but must use zip to attach here.
Attached Files
File Type: zip some audio transistors.zip (1.8 KB, 80 views)
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 24th February 2006, 11:36 AM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi Smoking,
there are hundreds of BJTs suitable for +-90V.

Look for Vce0>180V.

However, if you choose some close to this limit you will often find that the SOAR at 90V is not as good as one rated at 230Vce0.

Download the datasheets for a few and start extracting the permitted current at your chosen rail voltage to make comparisons.

MJE 21193/4 as well as the 21195/6 mentioned earlier are possible candidates.
__________________
regards Andrew T.
  Reply With Quote
Old 24th February 2006, 12:14 PM   #9
diyAudio Member
 
Join Date: Sep 2005
i would use 6 darlingtons per volatge rail and the power would be around 800w rms!!!!

if the amp could deliver 600w+rms at 2 ohm load at +-56V, then it could deliver around 800wrms at 4 ohm load at +-80V?
  Reply With Quote
Old 24th February 2006, 12:42 PM   #10
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi Smoking.
NO!
600W2r needs 49Vpk. +-56Vdc after rail droop and then subtract amp losses may just give 600W but expect a little less.

800W4r needs 80Vpk. +-80Vdc at the rails will NEVER give 800Winto 4ohms.
__________________
regards Andrew T.
  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
Horsetrade: Want MJ11015/6 swap Hitachi FETs mobyd Swap Meet 6 8th August 2010 10:01 AM
Mj11015/16 Kereng Solid State 1 19th August 2004 08:09 AM
Burning temp. of Mj11015 and MJ11016 darkm4n Solid State 17 14th December 2003 01:08 PM
MJ11015 Question.... Dj BASS AMP Solid State 10 30th March 2003 07:02 PM


New To Site? Need Help?

All times are GMT. The time now is 02:14 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2