Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 2nd March 2009, 12:06 PM   #1
Ted205 is offline Ted205  United Kingdom
diyAudio Member
 
Ted205's Avatar
 
Join Date: Jun 2008
Default Capacitance Multiplier PSU

Hi guys

I'm wanting to experiment with higher capacitance power supplies for my chipamp. I only have limited space in my chassis.

I've been looking into a simple capacitance multiplier PSU
Has anyone tried this setup with chipamps ?

i was hoping to use this layout for both +ve and -ve
Attached Images
File Type: jpg psu.jpg (89.5 KB, 341 views)
  Reply With Quote
Old 2nd March 2009, 12:37 PM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Why do you have 2 fuses ? you will only get your v+
out of this supply.
  Reply With Quote
Old 2nd March 2009, 12:55 PM   #3
Ted205 is offline Ted205  United Kingdom
diyAudio Member
 
Ted205's Avatar
 
Join Date: Jun 2008
well the same layout would be used for the +ve and -ve.

each will have their own bridge, the -ve would be taken from the gnd side relative to the +ve side.

2 fuses are used as extra protection (eg. reverse polarity) for my own benefit .
  Reply With Quote
Old 2nd March 2009, 01:27 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
replace R1 C2 with an RCRC filter.
510r+220uF and 510r+220uF will perform far better than 1000r+1000uF.

Add a resistor in parallel to the last C of this filter.
Use the value of this resistor to adjust the amount of ripple that the multiplier can attenuate.
A low value resistor will pull down the output voltage and give a higher voltage drop across the pass transistor. This voltage drop is the maximum ripple that the multiplier can attenuate.

A higher resistor will give a higher output voltage, but the ripple will leak through as the current is increased.

Your resistor is effectively infinity and tiny output currents will show ripple passing straight through the multiplier.

The really big advantage of the multiplier is that the rough smoothing cap can be made much smaller. You ignored this advantage by fitting 10mF. Try 1mF or 2m2F instead.
__________________
regards Andrew T.
  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
Capacitance Multiplier on SMPS jkeny Power Supplies 8 11th June 2008 02:59 PM
Capacitance Multiplier on SMPS jkeny Class D 3 29th May 2008 07:15 PM
Capacitance Multiplier Kinnja Solid State 2 13th January 2008 08:12 PM
Capacitance Multiplier for A5? siouxiebuff Pass Labs 3 21st January 2006 04:27 PM


New To Site? Need Help?

All times are GMT. The time now is 01:58 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