LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #10   Report Post  
Old November 7th 07, 03:47 PM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 40
Default BF981 classic preamp

Hi Allison,

On 7 Nov, 15:21, wrote:
On Wed, 07 Nov 2007 00:16:18 -0800,
wrote:



Hello,


On 7 Nov, 02:20, nx7u wrote:


4. The datasheet does not give any Vg2s/Id curves, and Vg1s cannot be
positive (max gate current is exceeded nearly immediately) so you're
stuck with 7mA for this part.


hmm then I surely damaged the mosfet when playing with gates
reversed.
I better find another one.


Reversing the gates wou;d not damage them. The gain would be poor
and other effects but no damage.


Hmm ok, I haven't yet desoldered the original one, I assumed it would
be bad when I read about the maximum gate current exceeded when Vg1s
is positive, which happened when I reversed the gates.


Thanks

Francesco



 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
BF981 substituting BF964? Samuel Hunt Homebrew 3 January 3rd 06 10:09 PM
FA: CLASSIC HEATHKIT IM-13 TUBE VTVM>A CLASSIC>Real NICE! RLucch2098 Equipment 0 June 26th 04 02:35 PM
FA: CLASSIC HEATHKIT IM-13 TUBE VTVM>A CLASSIC>Real NICE! RLucch2098 Equipment 0 June 26th 04 02:35 PM
FA: CLASSIC HEATHKIT IM-13 TUBE VTVM>A CLASSIC>Real NICE! RLucch2098 Swap 0 June 26th 04 02:35 PM
FA: $10.49 CLASSIC HEATHKIT IM-13 TUBE VTVM>A CLASSIC & DESIREABLE RLucch2098 Swap 0 June 22nd 04 06:31 PM


All times are GMT +1. The time now is 08:21 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017