|
New Leco Amp modules 650W/8R-1200W/4R |
Post Reply 
|
Page 123> |
| Author | |
DjLeco 
Young Croc 
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 820 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: New Leco Amp modules 650W/8R-1200W/4RPosted: 01 January 2014 at 2:28am |
|
Some improvements compared to the previous version: 6 output devices per rail. Triple deep darlington configuration, full simmetrical from in to out. Offset adjustment. Faster transistors on differential and VAS stages, with lower Cob capacitance. Double feedback pre-post L-R out filter. Improved output shortcircuit protection with faster transistors and lower Vce saturation. Improved randament regarding passing from AB class to B class above 60 celsius degrees, with dinamic bias. Some specifications: Supply from +/- 70 to +/- 115Vdc, output power 650 watts 8 ohms and 1200 watts 4 ohm at +/- 115Vdc. Damping factor >1000/8ohms/100Hz. Rise rime/fall time 2,5uSec, tipically 2,18uSec measured at 10Khz/8 ohms. Freq response 15Hz-20Khz -1db at extremes, 5Hz-30Khz -3 db at extremes internally limited. Some pictures:
Some movies and tests: Presentation: https://www.youtube.com/watch?v=STP1g9luils Classical bias class AB: https://www.youtube.com/watch?v=eyx1gNlNC0Y dinamyc bias passing from AB class to B class when temperature rises: https://www.youtube.com/watch?v=CysVsbNnvGM Rise and fall times: https://www.youtube.com/watch?v=40tmueYkMqo Max out 8 ohm: https://www.youtube.com/watch?v=tJkwmLvt5UI Max out 4 ohm: https://www.youtube.com/watch?v=Lcl-gFMOFkw Maximum RMS current preset for 4 ohms during 2 ohms load: https://www.youtube.com/watch?v=KfW4R9Pr5v0
Edited by DjLeco - 01 January 2014 at 2:29am |
|
|
I'm A Stupid SMART Romanian...
|
|
 |
|
|
TRE4U2NV
Old Croc 
Joined: 21 May 2005 Location: home Status: Offline Points: 0 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 January 2014 at 2:42am |
 as usual well done sir
|
|
|
|
|
all bass
Old Croc
Joined: 11 October 2012 Location: the Netherlands Status: Offline Points: 1845 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 January 2014 at 9:16am |
|
My hat's off to you sir!
|
|
|
https://www.instagram.com/my_modular_journey/
|
|
|
|
|
Nitz V1505
Old Croc
Joined: 16 September 2009 Location: UXBRIDGE Status: Offline Points: 1719 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 January 2014 at 10:13am |
|
Truely inspirational!!!! Hats off Sir. Id love me a few of those.
|
|
|
LET THE BASS ROLL LIKE THUNDER
& THE TOPS LIKE LIGHTNING..... |
|
|
|
|
DjLeco
Young Croc
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 820 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 January 2014 at 11:30am |
|
Thank you all for nice words, I want to wish you all, HAPPY NEW YEAR!
Me too, I like the results of new version, especially how protection WORKS.
I have 10 pieces (without heatsink) for sale, but I don't know how to proceed with transport from Romania, to you...
Maybe someone can help for that, with some opinions.
|
|
|
I'm A Stupid SMART Romanian...
|
|
|
|
|
Tan-2
Registered User 
Joined: 29 April 2011 Location: Glasgow Status: Offline Points: 255 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 January 2014 at 8:08pm |
|
impressive....
|
|
|
Logic will get you from A to B. Imagination will take you everywhere.
|
|
|
|
|
Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 9:05am |
|
Nice. What sort of price range are we talking (trade, of course)?
 Edited by Earplug - 02 January 2014 at 9:05am |
|
|
Earplugs Are For Wimps!
|
|
|
|
|
ArthurG
Young Croc
Joined: 03 May 2004 Location: France - China Status: Offline Points: 988 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 9:13am |
|
Leco,
Seems a nice design. congrats mate What are the output transistors ? |
|
|
|
|
TONY.A.S.S.
Old Croc
Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6867 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 9:13am |
|
Careful, don't get the man thrown out for selling.
|
|
|
|
|
Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7752 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 1:46pm |
Just a friendly question! And a PM would avoid any misunderstanding! |
|
|
Earplugs Are For Wimps!
|
|
|
|
|
DjLeco
Young Croc
Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 820 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 4:55pm |
|
All discussions are friendly, no problem gentlemans!
In the new year we must be more good, more understanding, more maleable.
Output devices are MJW21195+MJW21196, very robust if not exceeding SOA curve.
Modules are just for selling, not exchanges.
 Someone on other forum tryed to throw dirty on my work, saying the amp will not survive playing sinewave in shorted output, at variable signal level, because sensing transistors of protection, cannot act so fast...
I laught and I offered him his video, to chill itself...
Also shared to all of you:
Comments are welcomed!
|
|
|
I'm A Stupid SMART Romanian...
|
|
|
|
|
ArthurG
Young Croc
Joined: 03 May 2004 Location: France - China Status: Offline Points: 988 |
Post Options
Thanks(0)
Quote Reply
Posted: 02 January 2014 at 5:33pm |
Those are very good transistors ! But why did you choose 21195+21196 over let's say 21193+21194 that have even higher SOA in a smaller package ?
|
|
|
|
|
Post Reply
|
Page 123> |
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
TONY.A.S.S. wrote: