Multiple regulators - What is the end-output-impedance? - diyAudio
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 23rd November 2012, 05:56 PM   #1
kumori is offline kumori  Europe
diyAudio Member
 
Join Date: Mar 2011
Default Multiple regulators - What is the end-output-impedance?

Hallo,

I have a question about using multiple voltage regulators after another.
Is the output impedance, that the circuit "sees" just the output impedance of the last regulator used?

For example:

Transformer ---> CRC Filter ---> Gyrator serial reg --> Shunt regulator

Let´s say we have 1 Ohm Serial R in the CRC Filter, the Gyrator has an output impedance of 1 Ohm, followed by a shunt reg with 0.001 Ohm output impedance.

What does the powered circuit know about the 1+1 Ohm serial resistance, when the the last regulator stage has very low output impedance?

I guess also the size of the reservoir or decoupling caps comes into play, but can anyone give a reliable "rule of thump" or something similar?

Thanks
Florian
  Reply With Quote
Old 23rd November 2012, 06:00 PM   #2
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
The shunt regulator determines the output impedance.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy. Still time for signing up.
  Reply With Quote
Old 23rd November 2012, 06:01 PM   #3
kumori is offline kumori  Europe
diyAudio Member
 
Join Date: Mar 2011
OK, well that was easy.
Thanks.
  Reply With Quote
Old 23rd November 2012, 06:16 PM   #4
jcx is offline jcx  United States
diyAudio Member
 
Join Date: Feb 2003
Location: ..
the (active) shunt reg determines the small signal output impedance

but once you try drawing more than the shunt reg bias current it cuts off and the output Z rises
  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
SET output impedance vs speaker impedance Arno Pf Tubes / Valves 3 20th April 2012 07:37 PM
Closed end TL experiments, impedance flattening Dr_EM Multi-Way 90 5th January 2011 04:14 PM
Cleo: End to End 24bit 192khz USB DAC with tube output bcherry DIY HiFi Supply 7 3rd July 2010 11:15 PM
Multiple driver connection, impedance Dr_EM Subwoofers 5 3rd June 2009 09:44 PM
Can An Output Transformer Change A Voltage Amp's Output Impedance From 0.1 To 47 Ohms kelticwizard Everything Else 11 25th March 2007 05:17 AM


New To Site? Need Help?

All times are GMT. The time now is 02:36 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