My super LM4780 bi-amp in process

X.G. · 22nd February 2005, 09:47 AM

I am working at building a 'super'

Gainclone of 3 LM4780 power ICs.One of LM4780 is for the high channel,the other LM4780s which construct in parallel are for the low channel.

this new GC is based on my experience in LM3875 GC.Here is the sch of my LM3875 GC which sound very good...and thank for the carlosfm's info of Zobel networks.

the construction of main boards

the parts of PSU.the 13000U cap will be used in low channel,the PCB which have 1000U and MUR860 will be used in high channel

chris ma · 22nd February 2005, 12:26 PM

Happy New Year X.G.

I am just curious, how do you like your GC compare to your JLH mono blocks?

Regards,
Chris

X.G. · 22nd February 2005, 12:48 PM

hi, chris ma

my LM3875 GC(the second GC,not the which I posted 1/2 year ago ) is much better than my JLH 20W amp...the reason maybe that the PSU of JLH is bad(very simple,it is diodes+22000U cap

)

wxn · 22nd February 2005, 12:49 PM

Very nice. Really.

Evan Shultz · 23rd February 2005, 01:47 AM

Very nice

What are you using to isolate the LM4780 from the heatsinks?

X.G. · 23rd February 2005, 02:45 AM

Quote:

Originally posted by Evan Shultz
Very nice

What are you using to isolate the LM4780 from the heatsinks?

I used the isolate-film which from eletronic product

jleaman · 23rd February 2005, 02:53 AM

Nice work Congrat's..

X.G. · 24th February 2005, 05:03 PM

the main wiring almost finish

try in the box

karma · 24th February 2005, 05:45 PM

nice

G4ME · 24th February 2005, 06:14 PM

talk about tight spacing. hopefully there will be enough air flow to cool those chips off.

22nd February 2005, 09:47 AM	#1
X.G. diyAudio Member Join Date: Sep 2003 Location: GuangDong China	My super LM4780 bi-amp in process I am working at building a 'super' Gainclone of 3 LM4780 power ICs.One of LM4780 is for the high channel,the other LM4780s which construct in parallel are for the low channel. this new GC is based on my experience in LM3875 GC.Here is the sch of my LM3875 GC which sound very good...and thank for the carlosfm's info of Zobel networks. the construction of main boards the parts of PSU.the 13000U cap will be used in low channel,the PCB which have 1000U and MUR860 will be used in high channel

22nd February 2005, 12:26 PM	#2
chris ma diyAudio Member Join Date: Sep 2001 Location: Pickering, Canada	Very Nice Happy New Year X.G. I am just curious, how do you like your GC compare to your JLH mono blocks? Regards, Chris

22nd February 2005, 12:49 PM	#4
wxn diyAudio Member Join Date: Sep 2003 Location: Vilnius	Very nice. Really. __________________ Nothing is as simple as it seems

23rd February 2005, 02:53 AM	#7
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	Nice work Congrat's.. __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

24th February 2005, 05:03 PM	#8
X.G. diyAudio Member Join Date: Sep 2003 Location: GuangDong China	continue the main wiring almost finish try in the box


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22nd February 2005, 12:48 PM	#3
X.G. diyAudio Member Join Date: Sep 2003 Location: GuangDong China	hi, chris ma my LM3875 GC(the second GC,not the which I posted 1/2 year ago ) is much better than my JLH 20W amp...the reason maybe that the PSU of JLH is bad(very simple,it is diodes+22000U cap )

23rd February 2005, 01:47 AM	#5
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	Very nice What are you using to isolate the LM4780 from the heatsinks?

24th February 2005, 05:45 PM	#9
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	nice

24th February 2005, 06:14 PM	#10
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	talk about tight spacing. hopefully there will be enough air flow to cool those chips off. __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

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