LC Audio ZapPulse modules: Worth it? Anyone use? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 9th April 2003, 03:11 AM   #1
diyAudio Member
 
kidder's Avatar
 
Join Date: Mar 2003
Location: Albuquerque, NM, USA
Default LC Audio ZapPulse modules: Worth it? Anyone use?

Greetings,

I was wondering if anyone here has used or heard the LC Audo ZapPulse modules.

Are they truly suitable for high end audio reproduction?
Does midrange and high frequency reproduction suffer?

I'm sure quality of power supply construction would be a variable.

Also, I've noticed that http://www.lcaudio.dk sells one version of the module for $193 US. While http://www.diycable.com sells what appears to be a different version of the module for $150 US.

Any info about these modules (or alternatives) would be appreciated.

Best regards,
Keith
  Reply With Quote
Old 9th April 2003, 08:22 AM   #2
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
The one shown at DIY cable is the older version of it while the one shown on the LCaudio website is the latest one.

I haven't had the opportunity to listen to one so far. One thing that is disturbing to me is that they use a first-order filter at the output.

I would feel more comfortable with a filter of 2nd order at least.
Nowadys enough feedback techniques are known that would allow to even take feedback after the output filter.

The newer version of the amp is using a ferrite core with a large airgap for the output coil. This will be an advantage to the first version regarding EMC.

But the THD figures they state do still not look like those of a masterpiece. Though one still has to hear it to make a proper judgment.

Regards

Charles
  Reply With Quote
Old 9th April 2003, 01:30 PM   #3
AndersP is offline AndersP  Sweden
diyAudio Member
 
Join Date: Aug 2002
Location: Middle Sweden
After reading the handbook ( in Danish ) I learned that the output filter is indeed a second order. The big coil works together with an MKP cap.
I haven´t auditioned this amp myself but most customers are very plased, as I understand it, from the forums that I attend.
  Reply With Quote
Old 9th April 2003, 01:36 PM   #4
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
So they improved on this as well. The former documents showed only a series output inductor.

Regards

Charles

/who is a fan of switching amplifiers
  Reply With Quote
Old 9th April 2003, 02:21 PM   #5
UrSv is offline UrSv  Sweden
diyAudio Member
 
UrSv's Avatar
 
Join Date: Jan 2002
Location: Sweden
I think that there are two versions of the new one as well. One is with Black Gate VK caps.
__________________
UrSv
Those who say it can't be done should not stop those who are doing it.
  Reply With Quote
Old 9th April 2003, 03:04 PM   #6
AndersP is offline AndersP  Sweden
diyAudio Member
 
Join Date: Aug 2002
Location: Middle Sweden
Charles: To my knowledge, the cap was always there, as this is the handbook of the " old " module. The schematics they publish are very scatchy and for basic product information only as they claim to have some corporate secrets and stuff to protect. Some of the pictures of the modules on their homepage are also " treated " for the same reason.
  Reply With Quote
Old 9th April 2003, 03:33 PM   #7
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
That would explain some things: The 80 uH coil they stated in their first "manual" would never give an upper cutoff frequency of 80 kHz into 8 Ohms that they claimed. If you add a capacitor things look different of course.

I have seen that they even made an IC unrecognizable that I assume is the driver or even a combined modulator/driver.

I think that the circuit is quite straightforward and that it would be quite easy to copy (and also develop) except the PCB with vias.

Regards

Charles
  Reply With Quote
Old 9th April 2003, 03:44 PM   #8
AndersP is offline AndersP  Sweden
diyAudio Member
 
Join Date: Aug 2002
Location: Middle Sweden
Yes, it probably wouldn´t be that hard. They have a Q & A on their homepage also. Some of the customers posted quite funny black epoxy on cicuit board-questions on that board I remember.
  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
Optimal supply design for UCD and Zappulse modules ewildgoose Class D 305 26th August 2008 02:24 PM
2 x Zappulse 2.2SE modules for sale Bent Class D 1 30th January 2006 06:30 PM
For sale: 2 x Zappulse 2.2SE Modules Bent Swap Meet 10 29th January 2006 12:14 PM
ZAPpulse 2.2SE modules mattjk Swap Meet 5 6th June 2005 05:39 AM
For sale: LC Audio Zappulse 2.2SE modules m.parigi Swap Meet 9 1st March 2005 04:18 PM


New To Site? Need Help?

All times are GMT. The time now is 12:43 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