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.

input impedance of mosfet question?
input impedance of mosfet 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
Reply
 
Thread Tools Search this Thread
Old 9th November 2009, 01:59 AM   #1
AudioGeek is offline AudioGeek  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
Default input impedance of mosfet question?

What is the maximum recommended input impedance for a mosfet follower?

I was thinking of a using a tube input and 1:1 IT to drive a mosfer follower. The plate resistance of the tube is 2.3K.

Also thinking along the lines of an IRFP240N output running 24vdc 3-4A quiescent current. Follower into a 1:1 output transformer.

Oh and it would be push pull from input to output.

so would a tube with 2.3K plate resistance be ok to drive the mosfet with good high frequency response?

Thanks!

Richard
__________________
It is not you... you are it.
  Reply With Quote
Old 9th November 2009, 02:52 AM   #2
woody is offline woody
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
You may need to post that circuite. You are going to use a 1:1 output transformer?
  Reply With Quote
Old 9th November 2009, 03:11 AM   #3
AudioGeek is offline AudioGeek  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
yep 1:1 output and 1:1 IT transformer.

both are Push Pull.

Soo.. have 1:1 input transformer with phase splitter secondary straight to tube grid. battery bias on tube.

the tube with 2.3K of plate resistance is connected to a 1:1 IT.

This is connected to the mosfet gates. bias for mosfets probably at center tap of IT secondary or some other resistor arrangement to equalize current in the Push Pull mosfets.

soo.. do i need a cathode follower to drive the mosfets or can the regular connected tube do it?

Thanks!
__________________
It is not you... you are it.
  Reply With Quote

Reply


input impedance of mosfet question?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Chipamp input impedance question EBM_dude Chip Amps 6 26th October 2009 04:52 PM
general question about feedback, input impedance, and noise nobody special Solid State 8 29th August 2005 09:23 PM
Amp input impedance question ? sam9 Solid State 9 21st April 2005 02:28 PM
P3A question: high input impedance sobazz Solid State 1 14th July 2003 05:45 AM


New To Site? Need Help?

All times are GMT. The time now is 06:35 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki