Class AB Audio Amplifiers - Page 9 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Inactive Vendor Forums > Connexelectronic

Connexelectronic Commercial Vendors large & small hawking their wares

 
 
Thread Tools Search this Thread
Old 23rd February 2013, 12:26 AM   #81
diyAudio Member
 
Join Date: Oct 2005
Cool someone else is gonna do the same build as me, 2 LM49810s and an SMPS2000R.
Cristi you mentioned in a e-mail a few days ago to use CLC filter for the driver stage. I didnt see anything in the user manual about this. Can you explain or show me a diagram for what needs to happen with this?

Thanks
 
Old 23rd February 2013, 07:39 PM   #82
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Since both the power stage and driver stage are supplied from the same output of a regulated SMPS, the driver stage is better to be additionally filtered with one inductor on each rail and capacitors to GND. a series inductor with two capactitors to GND forms a PI filter: Capacitor-input filter - Wikipedia, the free encyclopedia this should be tunned to attenuate furthermore the remaining ripple of the smps. note that since the SMPS2000R switching frecv. is variable, so does the ripple freq. so the filter must be tuned to attenuate the ripple with the freq which match the switching frecquency at low-load when the amplifier plays low volume.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 6th March 2013, 12:22 AM   #83
diyAudio Member
 
Join Date: Oct 2005
Hmmmm.... Sounds a bit past my knowledge level. I might just do 2 TA3020v4 in BTL mode. Will be about the same price.
 
Old 15th March 2013, 06:29 PM   #84
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Indeed, and Each TA3020v4b can deliver more than twice the power of a single LME49810-500W amplifier, not to mention the increased efficiency, lower size and lower weight. the sound quality is similar when the amplifier is supplied from common available sources or not very expensive and efficient speakers are used to make the difference.

since this forum is not always accessible from my location, I set-up a small forum on the connexelectronic domain, don't be shy and click: Forum Connexelectronic • Index page
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 1st July 2013, 06:24 PM   #85
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Hi Cristi,

Will you offer your 300W LME49810 amps
  • without heatsinks
  • with the OPS devices separate, so that I may solder them after I receive the kit?
Please let me know. I would like the OPS devices separate because I prefer to solder them to the board after I've fitted them to the heatsink, to minimise any strain on the solder joints.

If yes, what will be your price for two such kits? (I.e. for a stereo amp).
 
Old 3rd July 2013, 02:32 PM   #86
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
TCPIP: Untill last year the LME49810 amplfier without heatsink was available, but since we made the last batch the non-heatsink version was removed because all the amplifier modules were built with heatsink. please contact me by mail I might have few empty boards available. also consider that if the module is purchased without the transistors installed, you have to test it properly after transistors are installed and before use.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 23rd September 2013, 01:11 AM   #87
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Hi Cristi,

My construction project got stalled and has woken up again now.

I'm now looking for your SAP15 amplifier. I would like one module please (which means two channels), without heatsink. Are they available?
 
Old 28th September 2013, 08:47 AM   #88
diyAudio Member
 
tane0019's Avatar
 
Join Date: Aug 2012
Location: Singapore
Hi Cristi,

I’m planning to make myself my 1st ClassAB amp DIY. Target is to make 2 mono-block.

Candidate I’m looking at is “500W LME49810 Audio Amplifier with Heatsink”.

From the manual on-line, it is stated that this module need +/- 78Vdc for power & +/- 84Vdc for driver stage.

I need a transformer 1.2KVA with main winding at +/- 56Vac and aux-1 winding at +/-60Vac and aux-2 winding at +/- 12Vac. I can’t seem to find this at you webshop. Do you sell such transformer? If so, how much??

In your current range of liner PSU, there is only one model available ‘Dual Rail Linear Power Supply [PS2-6C]” which only have max capacitors of 18,000uF at 71V.
This amp module need 4x18,000uF at 100V (assume for the power stage) PLUS 2x18,000uF at 100V (assume for the driver stage). Do you have such model/configuration? If so, how much??

I will also need “Speaker Protection Circuit [SPC1]” to customise for single channel in-out configuration. Will the price be the same?


I see that you also write about using SMPS as a possible alternative – will this type if implementation impacts the sound quality of the amp?
If using SMPS, that will need 2 (1 big one for the power stage & another small one for the driver stage).
Might also need 1 for the “Speaker Protection Circuit [SPC1]” – this board can take DC ??

Last edited by tane0019; 28th September 2013 at 09:08 AM.
 
Old 4th October 2013, 06:45 PM   #89
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
the LME driver circuits do not need a different front end voltage from the output stage voltage.
That is an option that you choose, or not.

You can run the front end from the same supply rails using the same voltage.
or
you can run the front end from a capacitance multiplier from the same supply rails.
or
you can add a second pair of same voltage supply rails, from same voltage but separate windings.
or
you can add a second pair of low voltage rails above the main supplies.
or
you can add a high voltage pair of supply rails running slightly above the main supplies
or
you can add a high voltage pair of supply rails running substantially above the mains supplies and regulate them down to near the main supplies.

AS you can see there are many options. All work. Only the last two require a second high voltage set of windings.
__________________
regards Andrew T.
 
Old 5th October 2013, 04:55 PM   #90
tcpip is offline tcpip  India
diyAudio Member
 
Join Date: Jan 2003
Location: Mumbai, India
Dear AndrewT,

Thanks a lot.

Now I am just hoping Cristi responds. I've sent him a PM too; no response. I was trying to freeze on the purchase of some of his amp modules. Hope all's well at his end.
 

 


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
non surface mount class D mono audio power amplifiers Conor Digital Source 10 4th October 2013 07:38 PM
Single-Ended Class-A Audio Amplifiers shaan Everything Else 32 4th September 2009 02:42 AM
Can a Class AB PP amp be said to be operating in Class A at low signal levels? ray_moth Tubes / Valves 19 23rd January 2009 07:52 PM
Thermal design for Class AB amplifiers mbroker Solid State 3 24th September 2002 03:03 AM
Class A vs. IC amplifiers for PC audio Beggar Solid State 15 26th July 2002 11:58 AM


New To Site? Need Help?

All times are GMT. The time now is 11:46 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