|
Home | Forums | Rules | Articles | diyAudio Store | Blogs | Gallery | Wiki | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
Chip Amps Amplifiers based on integrated circuits |
|
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 |
![]() |
|
Thread Tools | Search this Thread |
![]() |
#1 |
diyAudio Member
Join Date: Aug 2005
|
![]()
I am paralleling 2 LM4780 chips per channel fo my amp.
I have the power wired, but I am unsure of how to wire the signal paths. Both IN AND OUT. I have ideas but thought I better ask before I see that magic black smoke!!LOL Do I just run the + signal to one chip and the - to the other and then the corresponding polarity to the output jack? *A diagram would be nice* I am using the kits from audiosector.com. Thanks a ton, Dominick
__________________
A real amateur enthusiast! |
![]() |
![]() |
#2 |
diyAudio Member
Join Date: Feb 2003
Location: oregon
|
How about the schematic thats on the website, showing the connections?
amt |
![]() |
![]() |
#3 |
diyAudio Member
Join Date: Nov 2005
Location: Vilnius
![]() |
Read LM4780's datasheet.There is a schematic of paralell config.
If the power supply is wired correctly,you shouldn't smoke LMs that easy. A common problem is when there is no insulation washer between chip and heat sink(chip has -Vs connected to its case). If the sink is grounded , the power supply is usually powerful enough to blow IC in chunks.I have done it by myself once ![]() Regards , Lukas. |
![]() |
![]() |
#4 |
diyAudio Member
Join Date: Aug 2005
|
I dont think that my question was understood.
I have 2 chips already wired in parallel. Now I need to know how to parallel the paralelled chips!! Dominick
__________________
A real amateur enthusiast! |
![]() |
![]() |
#5 |
diyAudio Member
Join Date: Jan 2006
Location: Maine
|
If I'm correct, that would give you support of down to 1ohm...any reason to need it that low?
__________________
Life is what you make it. http://www.ssguitar.com |
![]() |
![]() |
#6 |
diyAudio Member
Join Date: Aug 2005
|
Good observation.
That is exactly why I am doing it. I intend on using this amp on my Martin Logan Ascent i speakers. I called the company direct and they said that the speakers run at 2.5 ohms @ 20k. Dominick
__________________
A real amateur enthusiast! |
![]() |
![]() |
#7 |
diyAudio Member
Join Date: Jan 2006
Location: Maine
|
2.5 ohms...that would run fine just with a parallel lm4780. 1 x 4780 parallel should give you about 120w @ 2 ohms I'm pretty sure.
__________________
Life is what you make it. http://www.ssguitar.com |
![]() |
![]() |
#8 |
diyAudio Member
Join Date: Aug 2005
|
I already tried it and blew one of the chips in less than a minute!
Dominick
__________________
A real amateur enthusiast! |
![]() |
![]() |
#9 |
diyAudio Member
Join Date: Jan 2006
Location: Maine
|
Did you have a heatsink on it? It shouldn't be a problem at all. People use the paralleled lm4780 setup from brian at chipamp.com for 2 ohms.
**edit** Here is the schematic they use: http://chipamp.com/lm4780.pdf
__________________
Life is what you make it. http://www.ssguitar.com |
![]() |
![]() |
#10 |
diyAudio Member
Join Date: Nov 2005
Location: Vilnius
![]() |
LM3886s can stand continous short circuit and has lots of protection.
Adding more in parallel may even worsen results , if ICs have DC offsets greater than a few mV. |
![]() |
![]() |
Thread Tools | Search this Thread |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Paralleling up DAC chips | 5th element | Digital Source | 103 | 2nd January 2013 07:12 PM |
Paralleling LM4780/3886: any impact on sound quality? | Arnop | Chip Amps | 51 | 4th May 2011 01:37 AM |
paralleling chips | odysseybmx414 | Chip Amps | 15 | 14th December 2005 06:57 PM |
paralleling 2 BrianGT lm4780 kits | jimbo1968 | Chip Amps | 0 | 30th November 2005 04:34 PM |
Any warnings about paralleling chips? | Morse | Chip Amps | 13 | 29th March 2004 09:28 PM |
New To Site? | Need Help? |