Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 4th October 2012, 05:54 PM   #1521
bcarso is offline bcarso  United States
diyAudio Member
 
Join Date: May 2005
Location: Canoga Park, California
Quote:
Originally Posted by scott wurcer View Post
How about CPC3730 from C P Clare? With that and some 140V transistors this could be the front end of a 100W amp.
Ahaa, didn't realize Clare sold individual parts, a logical move though, based on the optos stuff. That's reassuring that we have at least two manufacturers of depletion mode DMOS.

EDIT: Also the geometric mean of the threshold voltages listed is 2.5V, a bit higher than the other parts.

Last edited by bcarso; 4th October 2012 at 05:58 PM.
  Reply With Quote
Old 4th October 2012, 06:13 PM   #1522
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Quote:
Originally Posted by bcarso View Post
Ahaa, didn't realize Clare sold individual parts, a logical move though, based on the optos stuff. That's reassuring that we have at least two manufacturers of depletion mode DMOS.

EDIT: Also the geometric mean of the threshold voltages listed is 2.5V, a bit higher than the other parts.
Good point, BTW Infineon has some too, SOT23 and very low capacitances.
__________________
“The earth's rotation will slow within days and stop for several days just prior to the pole shift. This is when you and your loved ones should be situated at your safe location.”
  Reply With Quote
Old 4th October 2012, 06:19 PM   #1523
bcarso is offline bcarso  United States
diyAudio Member
 
Join Date: May 2005
Location: Canoga Park, California
So that's three already. Good. I always hate sole-source even for casual use.
  Reply With Quote
Old 4th October 2012, 06:26 PM   #1524
diyAudio Member
 
Join Date: Mar 2002
Quote:
Originally Posted by bcarso View Post
So that's three already. Good. I always hate sole-source even for casual use.
IXYS too.........
IXYS Website > Product Portfolio > Power Devices
  Reply With Quote
Old 4th October 2012, 07:06 PM   #1525
diyAudio Member
 
Join Date: Nov 2011
Location: Cooktown, Oz
Quote:
Originally Posted by dadod View Post
Just remove the line .include supertex.txt, you don't need it as in the simulation no supertex fet was used.
I did figure this out. But I was hoping for models for the Supertex FETs you recommend in
Quote:
I suggest to use deplation mode mosfets from Supertex for J3, J4, DN2540 could be good for it, more voltage for input fets.
dado
  Reply With Quote
Old 4th October 2012, 07:20 PM   #1526
diyAudio Member
 
Join Date: Nov 2011
Location: Cooktown, Oz
Quote:
Originally Posted by scott wurcer View Post
Rather than answer questions piecemeal how about I put a device by device description in the articles section, this is a holiday weekend I might have some time.
Scott, when you do this for #1397, could you also explain the reasons for various choices? I would much like to know the reasons for
  • the fancy output stage compared to simple Class B as in 990
  • why FET i/p instead of simple BJT in your rehash of 990
  Reply With Quote
Old 4th October 2012, 07:53 PM   #1527
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by kgrlee View Post
I did figure this out. But I was hoping for models for the Supertex FETs you recommend in
Here it is.
Attached Files
File Type: txt supertex.txt (27.7 KB, 44 views)
  Reply With Quote
Old 4th October 2012, 09:05 PM   #1528
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
High voltage devices to begin with will allow the SW-OPA to be adadted to power amp use is a very good idea. Truely universal design that way... My plane is about to leave.... check in when I'm on the other side of the world. -RNM
  Reply With Quote
Old 4th October 2012, 10:41 PM   #1529
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Quote:
Originally Posted by RNMarsh View Post
High voltage devices to begin with will allow the SW-OPA to be adadted to power amp use is a very good idea. Truely universal design that way... My plane is about to leave.... check in when I'm on the other side of the world. -RNM
Right now I'm watching Zimmern chow down on rat in Thailand.
__________________
“The earth's rotation will slow within days and stop for several days just prior to the pole shift. This is when you and your loved ones should be situated at your safe location.”
  Reply With Quote
Old 5th October 2012, 01:28 AM   #1530
fas42 is offline fas42  Australia
diyAudio Member
 
fas42's Avatar
 
Join Date: Jun 2012
Location: NSW, Australia
Blog Entries: 9
Just tried something else in my version of SW-OPA, looking at PSRR. At 20kHz, only a bit over 15dB on the -ve supply, 30dB on the +ve when working at a gain of 20. So an extremely well regulated supply will be necessary for the circuit as is ...

Frank

Last edited by fas42; 5th October 2012 at 01:32 AM.
  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
Discrete OPAMP audio-gd Vendor's Bazaar 27 20th September 2012 04:02 PM
discrete opamp help blackpowderaudio Parts 0 16th December 2009 03:46 PM
THAT transistor headphone amp (250ma discrete opamp) design sanity check. Russ White Headphone Systems 19 13th December 2007 12:52 PM


New To Site? Need Help?

All times are GMT. The time now is 02:31 AM.


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