Pooge 5.51 positive regulator - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 1st October 2002, 01:45 PM   #1
diyAudio Member
 
Join Date: Jul 2002
Location: usa,TN
Question Pooge 5.51 positive regulator

I plan on building the Pooge 5.51 voltage regulator noise reduction circuit.My question is :What adjustment(s) need to be made to possibly use a 7805 5 vdc regulator?Is the 1k trim pot allowing for voltage output adjustment?

Mike

Voltage regulators for line level circuits
__________________
audiodoc
  Reply With Quote
Old 1st October 2002, 03:12 PM   #2
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Default Pooge 5.51

You get the lowest output voltage when you short R862. In that case, Vo will be the ref voltage of the 329, 6.9V I think it is, +Vbe of the transistor, say 7.5V. If you want to go lower to Vo=5V, you need to replace the ref with something 4.3v or lower.

Jan Didden
  Reply With Quote
Old 1st October 2002, 03:29 PM   #3
ALW is offline ALW  United Kingdom
diyAudio Member
 
Join Date: Jun 2001
Location: UK
Default Quick mod

Add a cap across R861, with an impedance that's low relative to it's value.

It reduces noise significantly at higher frequencies, and lowers output impedance an order of magnitude.

In this form it's a VERY good sounding regulator.

You could try a TL431 as a reference, set to it's min o/p (2.5V), or just a zener of suitable value.

Andy.
  Reply With Quote
Old 1st October 2002, 04:11 PM   #4
diyAudio Member
 
Join Date: Jul 2002
Location: usa,TN
Default pooge 5.51

What value of cap across R861 do you recommend? I take it that the voltage in should be ~4.3 vdc or so to get 5 vdc out? For 15 vdc,would I come off the V out leg of a 317 into this circuit for the replacement on my circuit board or does this circuit replace a 317?

Mike
__________________
audiodoc
  Reply With Quote
Old 1st October 2002, 05:49 PM   #5
ALW is offline ALW  United Kingdom
diyAudio Member
 
Join Date: Jun 2001
Location: UK
Default Cap value

Quote:
What value of cap across R861 do you recommend?
Depends upon the value of R861 a bit, but basically the impedance of the capacitor wants to be low relative to the value of R861.

Xc=1 / (2*pi*f*C) should tell you all

A.
  Reply With Quote
Old 1st October 2002, 06:50 PM   #6
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Default Re: Quick mod

Quote:
Originally posted by ALW
Add a cap across R861, with an impedance that's low relative to it's value.

It reduces noise significantly at higher frequencies, and lowers output impedance an order of magnitude.

In this form it's a VERY good sounding regulator.

You could try a TL431 as a reference, set to it's min o/p (2.5V), or just a zener of suitable value.

Andy.
Hi Andy, seems I beat you to this thread by about 15 mins...?
Your advice is right on the dot, as usual.

BTW, how's the supplies coming along?

Jan Didden
  Reply With Quote
Old 1st October 2002, 08:01 PM   #7
ALW is offline ALW  United Kingdom
diyAudio Member
 
Join Date: Jun 2001
Location: UK
Default Jan

Are you back from hols?

I've been busy building for actual orders, and doing specific implementation documentation, so I'll get onto this weekend.

How's your AP BTW- I never got a reply from the UK distributor

Andy.
  Reply With Quote
Old 1st October 2002, 08:23 PM   #8
diyAudio Member
 
Join Date: Jul 2002
Location: usa,TN
Default impedance of cap

In your equation:Xc=1 / (2*pi*f*C) f=the frequency to filter,C=capacitance value or 3.0 x 10(8) m/sec?

Mike
__________________
audiodoc
  Reply With Quote
Old 2nd October 2002, 12:30 AM   #9
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Capacitance in Farads, hence microFarads will be 1e-6.

Grey
  Reply With Quote
Old 2nd October 2002, 02:59 AM   #10
diyAudio Member
 
Join Date: Jul 2002
Location: usa,TN
Default Xc=1 / (2*pi*f*C)

For the calculation to find the cap needed - what frequency is chosen for the upgraded Pooge circuit from ALW? You kind of leave me with missing info.Higher frequency from what to what?

Mike
__________________
audiodoc
  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
Crown IC-150A POOGE jackinnj Solid State 48 14th November 2013 12:38 PM
Positive regulator to produce negative voltage? stef1777 Parts 45 8th February 2008 07:46 AM
Acopian POOGE'd jackinnj Power Supplies 0 15th July 2005 02:29 PM
pooge-ing wrl Solid State 0 31st December 2003 06:33 AM
Pooge 5.51 pcb audiodoc Solid State 4 25th November 2002 08:55 AM


New To Site? Need Help?

All times are GMT. The time now is 04:48 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