Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

The "sound" of a mosfet in capacitance multiplier
The "sound" of a mosfet in capacitance multiplier
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 18th September 2018, 05:44 PM   #11
indaco is offline indaco
diyAudio Member
 
Join Date: Jun 2016
Location: Pizza country (Italy)
Quote:
Originally Posted by SemperFi View Post
Why on earth did you change from a decent FET to a monster?
I don't understand why indaco says you get 8-10V more with the old, there's not that much difference in Vgs in the two, and the IRFP has higher trasnconductance so the they should give about the same output voltage.
The IRFP should have better performance at low frequency (due to higher Gm) but poorer performance at higher frequencies (due to higher parasitic capacitances). But if that is audible I dunno...
The main reason was to improve the heat dissipation, using a bigger heatsink, but I didn't take into account the consideration sonically.
  Reply With Quote
Old 18th September 2018, 05:58 PM   #12
jlevro is offline jlevro  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Boxford, MA
I vote for the parasitic capacitance argument. The capacitance from drain-to-source for the 450 is much larger, so there is the possibility of a lot more noise getting into your circuit from the transformer/rectifier/line etc.
  Reply With Quote
Old 18th September 2018, 06:23 PM   #13
SemperFi is offline SemperFi  Wake Island
diyAudio Member
 
Join Date: Jan 2002
Location: nowhere
Quote:
Originally Posted by indaco View Post
The main reason was to improve the heat dissipation, using a bigger heatsink, but I didn't take into account the consideration sonically.
I see your point, logical enough. Interesting you can hear the difference...wow this search for ideal amplifier with ideal power supply with ideal cables with ideal sources with ideal music all terminating into ideal speakers just keeps us all so busy!
  Reply With Quote
Old 20th September 2018, 10:44 PM   #14
indaco is offline indaco
diyAudio Member
 
Join Date: Jun 2016
Location: Pizza country (Italy)
Quote:
Originally Posted by SemperFi View Post
I see your point, logical enough. Interesting you can hear the difference...wow this search for ideal amplifier with ideal power supply with ideal cables with ideal sources with ideal music all terminating into ideal speakers just keeps us all so busy!
In reality, I know the importance of the PSU especially with tubes...I try to be practical and for reason of space too I don't want to use complicated circuits. Oftentimes the first solution we think is the best
  Reply With Quote

Reply


The "sound" of a mosfet in capacitance multiplierHide 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
LTSPICE was wrong: MOSFET transconductance "gm" is NOT higher than bipolar gm Mark Johnson Solid State 33 12th January 2017 11:18 PM
Use "mu output" from depletion mode MOSFET load? rongon Tubes / Valves 25 29th April 2015 08:16 AM
Greg Ball GB150D "Simple Killer Amp" - two channel MOSFET power amp Gibguy Solid State 7 16th March 2015 04:42 PM
does anybody have an layout for anthony holtons "n-chanel" mosfet amp?? hifi Solid State 0 5th October 2001 09:39 AM


New To Site? Need Help?

All times are GMT. The time now is 04:40 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki