Regulated Power Supply using 6550 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 29th December 2012, 04:11 PM   #1
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Default Regulated Power Supply using 6550

I found a schematic the other day for a regulated power supply,and I made some changes,replaced an EL34 used for the feedthrough with a 6550,and replaced the the high voltage silicon transistor with a 12AT7 tube used for part of the error correction amp. Wanted to know if posted schematic needs any other changes. I can post original if needed. Original schematic gives an output from 60 to 400VDC at 150mA.
Attached Images
File Type: jpg 6550 Regulated Power.jpg (176.5 KB, 263 views)
  Reply With Quote
Old 29th December 2012, 04:35 PM   #2
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Here's the original
Attached Images
File Type: jpg image.jpg (434.7 KB, 252 views)
  Reply With Quote
Old 29th December 2012, 05:20 PM   #3
diyAudio Member
 
freax's Avatar
 
Join Date: Sep 2007
Impressive!
__________________
Personal website: http://www.shadytreeprojects.com/
  Reply With Quote
Old 29th December 2012, 05:23 PM   #4
Ketje is offline Ketje  Belgium
diyAudio Member
 
Join Date: Dec 2012
Location: Flanders
You shoud'nt put the heaters on the same transfo winding.Check the max.permissable voltage between heater and cathode !
Mona
  Reply With Quote
Old 29th December 2012, 05:42 PM   #5
jane is offline jane  Norway
diyAudio Member
 
jane's Avatar
 
Join Date: Jul 2004
Location: Norway
Quote:
Originally Posted by denny9167 View Post
Wanted to know if posted schematic needs any other changes.
V1 should be negative biased. With R13 in mid pos the bias voltage will be about 1/2 B+ in this setup..
__________________
Life is hard - Then you die.
  Reply With Quote
Old 29th December 2012, 08:24 PM   #6
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Quote:
Originally Posted by freax View Post
Impressive!
Thanks
  Reply With Quote
Old 29th December 2012, 08:26 PM   #7
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Quote:
Originally Posted by Ketje View Post
You shoud'nt put the heaters on the same transfo winding.Check the max.permissable voltage between heater and cathode !
Mona
I'm elevating the heaters on V1, and V2, do I need to use separate windings for V2?
  Reply With Quote
Old 29th December 2012, 11:10 PM   #8
diyAudio Member
 
Join Date: Oct 2011
Location: Tauberbischofsheim, Germany
I can't see any kind of regulation, neither in your hollow state, nor in the original solid state (from Elektor, I suppose?) version. There is no reference the output voltage would be compared with. It's just an adjustable voltage supply.

Best regards!

Last edited by Kay Pirinha; 29th December 2012 at 11:11 PM. Reason: add details
  Reply With Quote
Old 30th December 2012, 02:22 PM   #9
Ketje is offline Ketje  Belgium
diyAudio Member
 
Join Date: Dec 2012
Location: Flanders
In the original schematic there is a -70V reference.The way you try to do it here the outputvoltage will never go up(V1 keeps conducting).
With the 75k and 300k resistances the heater is between 300V and 350V above ground.For one part of V1 that's ok but the other has the cathode at 0V.Data of the 12AT7 :Vfk=90V max! You can't use a dubble triode here.
The powertubes (6550 or EL34) is limited to 100V ,so yes every tube a winding of it's own
Mona
.
  Reply With Quote
Old 30th December 2012, 03:08 PM   #10
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Quote:
Originally Posted by Ketje View Post
In the original schematic there is a -70V reference.The way you try to do it here the outputvoltage will never go up(V1 keeps conducting).
With the 75k and 300k resistances the heater is between 300V and 350V above ground.For one part of V1 that's ok but the other has the cathode at 0V.Data of the 12AT7 :Vfk=90V max! You can't use a dubble triode here.
The powertubes (6550 or EL34) is limited to 100V ,so yes every tube a winding of it's own
Mona
.
So I should probably stick with the transistor,and only use half of the 12AT7,and use separate windings? I won't need to worry about lifting my heaters either?

Last edited by denny9167; 30th December 2012 at 03:12 PM. Reason: missing text
  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
The Well Regulated Power Supply andrea_mori Power Supplies 134 23rd July 2014 05:57 PM
Regulated power supply meanman1964 Everything Else 13 9th April 2007 03:50 AM
Regulated power supply crissty Chip Amps 23 2nd September 2005 05:18 AM
regulated power supply yugaaa Solid State 17 28th January 2003 03:39 PM
regulated power supply yugaaa Solid State 3 17th June 2002 07:22 PM


New To Site? Need Help?

All times are GMT. The time now is 03:11 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