Go Back   Home > Forums > Amplifiers > Power Supplies

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 2013, 07:59 PM   #3821
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by ikoflexer View Post

Makes no sense to put a ccs on the ground/return wire.
That may depend on what one wants the CCS to accomplish.
  Reply With Quote
Old 15th March 2013, 08:55 AM   #3822
regal is offline regal  United States
diyAudio Member
 
Join Date: Jan 2004
Location: MD
Has anyone tried parallel mosfets in order to supply a power tube like a 2A3 or even 300B ?
  Reply With Quote
Old 15th March 2013, 09:08 AM   #3823
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
No reference that I can remember of. It is not simple as that if to be tried out though. It will very possibly need an overhaul.
  Reply With Quote
Old 15th March 2013, 10:33 PM   #3824
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Hi Salas,
What amount of ripple voltage would be sufficient for the input of HV Shunt Regulator V2?
  Reply With Quote
Old 15th March 2013, 10:40 PM   #3825
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Not much over 5VPP would be helpful when having the recommended 20VDC Vin-Vout margin.
  Reply With Quote
Old 15th March 2013, 10:50 PM   #3826
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally Posted by Joshua_G View Post
That may depend on what one wants the CCS to accomplish.
In this context, of a shunt regulator, it would accomplish a disaster.
  Reply With Quote
Old 15th March 2013, 10:56 PM   #3827
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally Posted by regal View Post
Has anyone tried parallel mosfets in order to supply a power tube like a 2A3 or even 300B ?
I have tried it on my shunt reg experiments, not exactly this schematic, but similar. The first obvious thing you notice is that the capacitance of the paralleled mosfets is higher. On account of this you lose all that good performance in the high frequency range. So you may as well go for the simplistic version. Also, you can chose much beefier mosfets.
  Reply With Quote
Old 15th March 2013, 11:04 PM   #3828
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by ikoflexer View Post
In this context, of a shunt regulator, it would accomplish a disaster.
Thanks Salas.

Quote:
Originally Posted by ikoflexer View Post
In this context, of a shunt regulator, it would accomplish a disaster.
Though I abandoned this idea, I cannot see why it would accomplish a disaster.
  Reply With Quote
Old 15th March 2013, 11:06 PM   #3829
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Anyways a good PSU is needed whatever it is. "It is most important to realise that an amplifier is merely a modulator and controls the flow of energy from the power supply to the load. If the power supply is poor and has insufficient energy to meet the amplifier's peak demands, then the most beautifully designed amplifier will be junk."

MORGAN JONES
VALVE AMPLIFIERS 4TH EDITION page 334.
  Reply With Quote
Old 16th March 2013, 05:55 AM   #3830
regal is offline regal  United States
diyAudio Member
 
Join Date: Jan 2004
Location: MD
Quote:
Originally Posted by Salas View Post
No reference that I can remember of. It is not simple as that if to be tried out though. It will very possibly need an overhaul.
I've been running my SSHV1 at pretty stressful conditions ( I thought that the more extra current the better.) It supplies the tube 20mA @180V and dumps an extra 40 mA, V-in is about 230V with a big heatsink. Its been stable for a year (red PCBs.)

So I don't think supplying an output of 65ma +20ma @370 is too much of a stretch for the SSHV2. Especially with the new IXTY-TA-TP08N50D2 depletion mosfet at Q1(which can be mounted to the off-board sink).


I think a TO-247 like IRFP450 , would sub for Q3 ?
  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
Regs - Shunt vs Series richie00boy Solid State 42 14th March 2013 06:45 PM


New To Site? Need Help?

All times are GMT. The time now is 10:27 PM.


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