Regulated Power Supply For F3 (zen V9) - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 12th September 2008, 02:51 AM   #1
gionag is offline gionag  Italy
diyAudio Member
 
Join Date: Jun 2007
Question Regulated Power Supply For F3 (zen V9)

Hi folks,

I'm trying to do a better Power Supply for Zen v9 and my idea was to implement the regulated power supply based on the Nelson Pass Document where he explain how to use a regulated power supply applied to a Zen V.3 HERE THE PDF.

NOW, from the beginning i'm intended to use a 650VAC toroidal-transformer custom made by "italsistemi" for audio purpose

The SPECS are :
225 Volt PRIMARY (this is the voltage in my house)
2x41 Volt SECONDARYs (1 RAIL FOR CHANNEL) (I want to supply Zen with 50VOLT)

After the bridge i'd want to use ONLY 40.000uf of filtering (each channel).

Here the base schematics of regulator
Click the image to open in full size.

After the filter I theorically have : 41 * 1.414 = 58Volt (arrot).
From this 58 Volt i subtract the 4 Volt of the IRFP240 (that actually make the regulation (Q1)) and remain another 4 voltage that i drop on the R1 making the right current (2mA) for the Zener Stack.

Then the value of R1 is : 4 Volt / 0.002 A = 2000Ohm and the power is P = (V * V) / R = (4*4) / 2000 = 16 / 2000 = 0.008Watt.

As i say before the Q1 is an IRFP240 and i supply that with a stack made by five 10Volt 1/2W Zener.

C1 and C2 are 220uf 63 Volt and R2 is 1500ohm.

Do you think that is right ?
Tell my if I am wrong. I'm not an engineer and i'm trying to make light in my head about this questions.

THANKS TO ALL !
You're a great support.

Michele
  Reply With Quote
Old 12th September 2008, 09:26 AM   #2
h_a is offline h_a  Europe
diyAudio Member
 
h_a's Avatar
 
Join Date: Sep 2006
Location: Graz, Austria
Hi Michele,

I just want to hint you that the F3/Zen#9 already uses a capacitance multiplier which is a sort of regulated psu.

However if you want to do it, do it

The real gain is adjusting the source degeneration resistors for nice loadline cancelation as described in the article.

Have fun, Hannes
  Reply With Quote
Old 12th September 2008, 11:46 AM   #3
gionag is offline gionag  Italy
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally posted by h_a
Hi Michele,

I just want to hint you that the F3/Zen#9 already uses a
capacitance multiplier which is a sort of regulated psu.

However if you want to do it, do it

The real gain is adjusting the source degeneration resistors for nice loadline cancelation as described in the article.

Have fun, Hannes
What is the capacitance multiplier ? and how it works ??

thanks a lot
  Reply With Quote
Old 12th September 2008, 07:17 PM   #4
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
The ZV9 already has the circuit you are likely to want - just put
some Zener diodes in parallel with the capacitor that drives the
Mosfet.
  Reply With Quote
Old 12th September 2008, 07:34 PM   #5
gionag is offline gionag  Italy
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally posted by Nelson Pass
The ZV9 already has the circuit you are likely to want - just put
some Zener diodes in parallel with the capacitor that drives the
Mosfet.

What is exactly the "capacitor that drives the mosfet" ? maybe is the 220uf 63volt cap ? os you intend the main filtering cap ?
  Reply With Quote
Old 17th September 2008, 01:47 AM   #6
gionag is offline gionag  Italy
diyAudio Member
 
Join Date: Jun 2007
Anyway, there's problem using a regulated power supply ?

thanks !
  Reply With Quote
Old 17th September 2008, 06:42 PM   #7
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by gionag
What is exactly the "capacitor that drives the mosfet" ? maybe is the 220uf 63volt cap ? os you intend the main filtering cap ?
When you look at the circuit you posted at the beginning of this thread,
you should notice that the Zen 9 has the same circuit, minus the zener
diodes. If you want to add the zener diodes, the circuit will then be regulated.

I personally don't bother as the Zen 9 is largely self regulating anyway by
virtue of the current source and the negative feedback. The filter system
provides slow turn-on and low noise.
  Reply With Quote
Old 17th September 2008, 10:17 PM   #8
gionag is offline gionag  Italy
diyAudio Member
 
Join Date: Jun 2007
thanks... then i'll try with the zener diode, i'll put a 50 Volt 1 Watt zener across the 220cap (C3), Then the ouput voltage at source of Q4 should be 46 Volt but with an ..."Old-School"... Voltage stabilization. that's right ?

Thanks for support.
Michele
  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
Regulated DC power supply Panicos K Power Supplies 11 21st October 2006 12:32 AM
Regulated power supply crissty Chip Amps 23 2nd September 2005 04:18 AM
regulated power supply yugaaa Solid State 17 28th January 2003 02:39 PM
Using regulated power supply for A3 kirc Pass Labs 4 25th October 2002 12:09 PM
regulated power supply yugaaa Solid State 3 17th June 2002 06:22 PM


New To Site? Need Help?

All times are GMT. The time now is 07:57 AM.


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