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.

simple amplifier with mosfets
simple amplifier with mosfets
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 13th March 2004, 04:56 PM   #11
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
simple amplifier with mosfets
Quote:
Originally posted by Charles Hansen
Per Anders is right. Use a Vbe multiplier as I suggested above, and mount it on the heatsinks. To address the bias stability of the input transistor as Traderbam noted, add an emitter resistor on the input transistor.
A Mosfet Vgs multiplier would be even more appropriate, and
consider some small output Source resistors, like .33 - .47 ohm.

Then, I think you'll have an amp.
  Reply With Quote
Old 19th March 2004, 03:09 AM   #12
Diode is offline Diode  United States
diyAudio Member
 
Join Date: Feb 2003
Location: Oklahoma USA
This one's pretty simple but FET's aren't made any more. Check with the FET experts to convert it to IRF FET's. If nothing more, you may get some ideas about biasing.

Chris
Attached Files
File Type: zip af-3.zip (81.9 KB, 124 views)
__________________
The best audio is clean audio!
  Reply With Quote
Old 19th March 2004, 11:22 PM   #13
Charles Hansen is offline Charles Hansen
diyAudio Member
 
Join Date: May 2003
Location: Colorado
Hello Diode,

I wouldn't try to put vertical FETs in an amp designed for lateral FETs. The lateral FETs are still made. Hitachi split off their semiconductor division as Renesas. You can see their products at:

http://www.renesas.com/eng/products/...tor/index.html

Click on the link that says "Power MOSFET for General Amplifier". They don't make metal TO-3 packages any more, but they do make the plastic TO-3P (TO-247) packages.

Improved clones are also made in England by Magnatec:

http://www.magnatec-uk.co.uk/mosdata.shtml

These are available in both plastic and metal packages.

Hope this helps,
Charles Hansen
  Reply With Quote
Old 19th March 2004, 11:58 PM   #14
Michael Rothacher is offline Michael Rothacher  United States
AudioMaker.Tech
diyAudio Member
 
Michael Rothacher's Avatar
 
Join Date: May 2001
simple amplifier with mosfets
Charles:

Do you know of a Renasas distributor in the U.S.?

Ugh... I'm sorry, I just answered my own question. It looks like Arrow stocks them. $5 for 2SK1058's is pretty remarkable considering what some folks are selling NOS for.

Well, since I have you on the line...

I was reading your Balun article (Thanks!) I'd like to add some attenuation at the input of the receiver for speaker-level inputs (bal/unbal) for a distortion measuring rig. Do you know of any pitfalls in using dividers with these chips?
  Reply With Quote
Old 20th March 2004, 01:21 AM   #15
Charles Hansen is offline Charles Hansen
diyAudio Member
 
Join Date: May 2003
Location: Colorado
Believe it or not, there are two Charles Hansens in audio. I work for Ayre Acoustics and live in Colorado, and the other Charles Hansen lives back east and writes articles for AudioXpress. It's kind of confusing....
  Reply With Quote
Old 20th March 2004, 02:30 AM   #16
Michael Rothacher is offline Michael Rothacher  United States
AudioMaker.Tech
diyAudio Member
 
Michael Rothacher's Avatar
 
Join Date: May 2001
simple amplifier with mosfets


Sorry for my gaff, Charles. But thanks nonetheless!

So you're the Ayre guy.... Cool
  Reply With Quote

Reply


simple amplifier with mosfetsHide 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
help about power amplifier mosfets milad-k800 Car Audio 1 23rd August 2008 09:26 PM
Simple amplifier hobbit Solid State 15 27th January 2008 06:30 AM
pcb for Crescendo power amplifier / 2 pair of mosfets Dusk Elektor 1 23rd December 2006 12:08 PM
simple amplifier east electronics Solid State 12 26th January 2006 11:18 PM
Lynx amplifier using Mosfets Dusk Solid State 7 16th July 2005 11:26 PM


New To Site? Need Help?

All times are GMT. The time now is 08:14 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki