Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Where are the ZV9 builders???
Where are the ZV9 builders???
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 25th January 2008, 06:24 AM   #101
coffin is offline coffin  Taiwan
diyAudio Member
 
coffin's Avatar
 
Join Date: Oct 2002
Location: Taiwan
Hi Nelson,

Thank you! Is any specific value, say 220uF?

cheers

Coffin
__________________
Ignorance and self-centered are the epidemics of human.
  Reply With Quote
Old 26th January 2008, 08:42 AM   #102
coffin is offline coffin  Taiwan
diyAudio Member
 
coffin's Avatar
 
Join Date: Oct 2002
Location: Taiwan
Some new pics :

Where are the ZV9 builders???


Where are the ZV9 builders???


Soft start module
Where are the ZV9 builders???


The output cap are RIFA PEH169 22000uF + RIFA PEG124 1000uF + MKP 0.47uF as base.
Today I did some bypass testing, found that one Mcap MKP supreme 4.7uF + one Bennic XPP 39uF to get the superb result.
Will keep on testing....

cheers

Coffin
__________________
Ignorance and self-centered are the epidemics of human.
  Reply With Quote
Old 26th January 2008, 09:37 AM   #103
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
Nice!
  Reply With Quote
Old 26th January 2008, 09:52 AM   #104
Manu is offline Manu  Europe
diyAudio Member
 
Manu's Avatar
 
Join Date: Nov 2002
Location: Vienna, Ostrich
Superb work!

Manu
  Reply With Quote
Old 26th January 2008, 05:05 PM   #105
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
By the way...

I've been fiddling with my ZV9, again. I used to run it as a transconductance amplifier, with no feedback and with disconnected Aleph CS. I had loaded the output with various resistors-values from 7.5-15 ohms worked best.

But, I got an itch and some free time, and opened it again...

I decided to go back to feedback variant...but I wanted just a little bit...

Inserted feedback resistor 31.7 k (27 k+4.7 k). Input resistor 2.7 k. Also put a 330 nF capacitor to hi-pass it at around 180 Hz. Fed by a "passive" preamp, it has enough gain for Visaton B200's in 2-way Open Baffle...

Now, which variant sounds better? I don't know. Non-feedback variant sounded more "lively" but it got unpleasant at high volumes. With feedback, it is more "shy" but a bit cleaner.

Just a matter of taste....
  Reply With Quote
Old 20th February 2008, 04:33 PM   #106
jimmyd53 is offline jimmyd53  United States
diyAudio Member
 
jimmyd53's Avatar
 
Join Date: Jan 2006
Location: EUGENE, OREGON
Good Morning,

Coffin is using a Rifa 22000uf/63v as a C1 output cap in the amp pictured above. Nelson specs a 15000uf/63v cap and a number of builders are using a 10000uf/63 Jensen 4 pole. Is there any downside to using such a large value cap in this position? Any upside? Thanks. James
  Reply With Quote
Old 20th February 2008, 10:26 PM   #107
GRollins is offline GRollins  United States
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Downside: It costs more, more capacitance takes up more space
Upside: Better filtration, better dynamics
Bear in mind that most electrolytics have really wide tolerances. It's nothing to see +-20%. If you think in terms of 15000uF and add 20%, you're almost half-way to 22000uF. Unless you go really nuts, there won't be a problem. If you do go nuts, stick a resistor or inductor in front of the cap bank to slow the pulse it draws from the diodes. Problem solved.

Grey
  Reply With Quote
Old 20th February 2008, 10:44 PM   #108
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Where are the ZV9 builders???
Quote:
Originally posted by GRollins
Downside: It costs more, more capacitance takes up more space
Upside: Better filtration, better dynamics
Bear in mind that most electrolytics have really wide tolerances. It's nothing to see +-20%. If you think in terms of 15000uF and add 20%, you're almost half-way to 22000uF. Unless you go really nuts, there won't be a problem. If you do go nuts, stick a resistor or inductor in front of the cap bank to slow the pulse it draws from the diodes. Problem solved.

Grey

Grey .......... yes ;

but - output cap was/is in question .
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 21st February 2008, 12:11 AM   #109
GRollins is offline GRollins  United States
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Okay...caps, take two:
Downside the same.
Upside being lower rolloff point for bass.
Howzzat?

Grey
  Reply With Quote
Old 21st February 2008, 12:22 AM   #110
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
Most of what Grey say's is true until you get to the goin nuts part. But, bigger tends to improve low freq performance. Gives less phase shift. Lower Damping Factor. Lower Xl, lower ESR, quite likely higher ESL. Even if only an infinatesmally small amount of improvement is to be gained, someone will go for it. And of coarse, listening to it wins out every time.
One suggestion I've read regarding caps effecting your signal path. When they are out of the passband by a wide margin, their bad effects are less noticeable or effect the signal less. But then, I've also read, never use a bigger cap than necessary too.
  Reply With Quote

Reply


Where are the ZV9 builders???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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
calling all builders rv1890 Multi-Way 3 22nd January 2005 11:02 PM
one for the box builders offroadbum Car Audio 2 11th October 2004 10:19 PM


New To Site? Need Help?

All times are GMT. The time now is 04:22 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki