Keantoken's CFP cap multiplier - Page 14 - 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 2010, 03:43 AM   #131
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Lol, current draw is... Zero.

I just wired up a 50 ohm resistor, will test with that, then measure ripples.

Okay, I just did that. Input ripple is 20mV, output is 50uV. That gives 400, which is ~52db input isolation. Still underwhelming considering simulation... But good nonetheless.

- keantoken
  Reply With Quote
Old 23rd November 2010, 03:52 AM   #132
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
HiFi, it turns out you have good timing. I just blew up the prototype.

So it looks like that is that for now. However I did get to look at the ripple for a few seconds with 200mA load, and everything appeared normal.

- keantoken
  Reply With Quote
Old 23rd November 2010, 04:16 AM   #133
diyAudio Member
 
Join Date: May 2004
Location: Sydney
I have got your part list and am checking out an order from Mouser. It asked for a telephone number. I gave my Australia number but it rejects it. Can you email me a valid US number immediately?

P.S. and it is tricky - I have just entered Mouser's phone number and it rejects it too!

Again. I took out the leading 8 and it passed it. However, it says some items are back ordered, I am wondering if I will click on the continue button...

Last edited by HiFiNutNut; 23rd November 2010 at 04:20 AM.
  Reply With Quote
Old 23rd November 2010, 04:17 AM   #134
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Just sent it.

- keantoken
  Reply With Quote
Old 23rd November 2010, 04:32 AM   #135
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by keantoken View Post
Lol, current draw is... Zero.

I just wired up a 50 ohm resistor, will test with that, then measure ripples.

Okay, I just did that. Input ripple is 20mV, output is 50uV. That gives 400, which is ~52db input isolation. Still underwhelming considering simulation... But good nonetheless.

- keantoken
From 58dB theoretical to 52dB practical I don't see anything underwhelming IMHO. That is about what the CFP does for filtering with practical parts it seems. Now if you wanted something like -60dB real, maybe you could make it RC, RC, instead of straight 1mF C1. If you want the low Zo and a super line regulation practical figure in some application, couldn't it work with two CCTs in a row?
  Reply With Quote
Old 23rd November 2010, 04:34 AM   #136
diyAudio Member
 
Join Date: May 2004
Location: Sydney
O.K. Good luck on you.

The following parts will be sent to you tomorrow from Mouser:

2 x 2SA1930
2 x 2SC5171
10 x BC550C
10 x BC560C
20 x 1N4002
2 x 1k
2 x 100R
2 x Panasonic FC 1000uF 25V

There is a back order of 20 x mpsh81 that will be sent to you separately. These are for my use for the future rebuild of the Iko regs on power amp chassis. Since the shipping costs to Australia starts from $30 it would be kind of you to send these in a normal envolope to me, which should cost you perhaps a couple of dollars, saving me $30 in shipping, if you don't mind.
  Reply With Quote
Old 23rd November 2010, 11:30 PM   #137
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Great! Thanks a bunch.

DIYAudio is doing weird things, and I don't see Iko's reply on the forum, but I got the Email.

Iko's circuit has much better input isolation, because of the cascoded transistors, which eliminates the detrimental Early effect. I tried to come up with a reliable meld between this and the CFP multiplier in the simulator, to combine the virtues of the two, but I wasn't successful, at least not yet. The problem was more robustness and reliability than whether the circuit actually worked. In any case, adding another transistor will almost surely add another 1.3V drop.

The circuits are different, but the goals are related, so I would say discussing them both here may be helpful.

- keantoken
  Reply With Quote
Old 24th November 2010, 12:15 AM   #138
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
kt, I deleted the post because it was off topic. But it's the simplest thing anyway, a couple bjts with caps on the base
  Reply With Quote
Old 24th November 2010, 12:18 AM   #139
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
  Reply With Quote
Old 24th November 2010, 01:08 AM   #140
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
I simulated these three and the 3rd circuit has the best specs on all counts. Zout with output current is from .1-12A in order of ROYGBIV.

- keantoken
Attached Images
File Type: png Kmult10A.png (83.6 KB, 340 views)
  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
Vbe multiplier - bypass cap Donk Solid State 7 22nd January 2008 02:55 AM
Question(s) about CFP. Justcallmedad Solid State 94 20th September 2005 11:08 AM
cap multiplier or not? PederBass Solid State 13 23rd March 2004 07:26 PM
Cap. multiplier or regulated supply ? Buhl Pass Labs 1 8th October 2003 11:51 PM


New To Site? Need Help?

All times are GMT. The time now is 03:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2