Which BrianGT chipamp kit to buy

scott_jcp · 22nd February 2005, 07:00 AM

I want to build a stereo amp that can output between 80-100W per channel into 8 Ohms. I have been looking around, and chipamp.com's kits look like a good place to start, however, I don't know which kit to purchase. Will I need to parallel output to get the power I am looking for?

Thanks in advance for the help,
Scott

Jean · 22nd February 2005, 07:04 AM

The LM 4780

scott_jcp · 22nd February 2005, 06:09 PM

Bump: Can anyone give me some information about paralleling or bridging the amps to get the power I am looking for? Also, how many transformers will be required?

scott_jcp · 24th February 2005, 03:38 AM

Bump: Anyone?

jeff mai · 24th February 2005, 03:56 AM

Quote:

Originally posted by scott_jcp
Bump: Anyone?

Try a forum search. I think this has been covered so many times that people are bored with it.

x. onasis · 24th February 2005, 04:21 AM

Hi Scott, Jeff's prolly right, there are lots of discussions going on about the differences between these chips and kits. Not the least of which is the CarlosFM Snubberization that's being implimented with the new ones.

If you need the most power, or want to drive 4 Ohm speakers w/o the snub, the 4780 is it. It's essentially two 3886's on one chip, but it needs a larger heatsink.

OTOH, the 3785 is more documented at the moment, and is slightly easier to build if it's your first one as the pictures in Brian's manual presently show it's construction. This'll get you up to around 56W.

There's lots to read here, and you will, but jump right in. The kits make it easy, Read the sheets at National to get a complete overview of the basic IC's.

One hint to the search function here is to click the "Show results as posts" button.

Why do you need 80-100 WPC? (rhetorical question, but feel free to answer)

scott_jcp · 24th February 2005, 04:38 AM

The speakers I currently have (some cheap-ish Sony towers) have an program rating of 120 or thereabouts, and I want to be able to drive them to their potential.

56W might be loud enough though. Can you get 56 Watts out of the stereo kit, or is that the dual mono?

Thanks for your help.

x. onasis · 24th February 2005, 05:29 AM

I'm sure one of these will drive them to their potential. To me, 2 Watts to most speakers is around 90dB and that's quite loud.

You should also look around Nick's

Decibel Dungeon . most everything you'll need to know that isn't on Brian's site is spelled out rather well.

llmobll · 24th February 2005, 08:02 AM

If you want a bit more power:

http://www.partsexpress.com/pe/showd...number=122-640

22nd February 2005, 07:00 AM	#1
scott_jcp diyAudio Member Join Date: Feb 2005 Location: Richardson, TX	Which BrianGT chipamp kit to buy I want to build a stereo amp that can output between 80-100W per channel into 8 Ohms. I have been looking around, and chipamp.com's kits look like a good place to start, however, I don't know which kit to purchase. Will I need to parallel output to get the power I am looking for? Thanks in advance for the help, Scott

22nd February 2005, 07:04 AM	#2
Jean diyAudio Member Join Date: Mar 2002 Location: Sacramento, CA	The LM 4780 __________________ left lane is for passing, slower traffic keep right please.

24th February 2005, 04:21 AM	#6
x. onasis diyAudio Member Join Date: Jan 2003 Location: NYS	Hi Scott, Jeff's prolly right, there are lots of discussions going on about the differences between these chips and kits. Not the least of which is the CarlosFM Snubberization that's being implimented with the new ones. If you need the most power, or want to drive 4 Ohm speakers w/o the snub, the 4780 is it. It's essentially two 3886's on one chip, but it needs a larger heatsink. OTOH, the 3785 is more documented at the moment, and is slightly easier to build if it's your first one as the pictures in Brian's manual presently show it's construction. This'll get you up to around 56W. There's lots to read here, and you will, but jump right in. The kits make it easy, Read the sheets at National to get a complete overview of the basic IC's. One hint to the search function here is to click the "Show results as posts" button. Why do you need 80-100 WPC? (rhetorical question, but feel free to answer) __________________ onasis

24th February 2005, 05:29 AM	#8
x. onasis diyAudio Member Join Date: Jan 2003 Location: NYS	I'm sure one of these will drive them to their potential. To me, 2 Watts to most speakers is around 90dB and that's quite loud. You should also look around Nick's Decibel Dungeon . most everything you'll need to know that isn't on Brian's site is spelled out rather well. __________________ onasis

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22nd February 2005, 06:09 PM	#3
scott_jcp diyAudio Member Join Date: Feb 2005 Location: Richardson, TX	Bump: Can anyone give me some information about paralleling or bridging the amps to get the power I am looking for? Also, how many transformers will be required?

24th February 2005, 03:38 AM	#4
scott_jcp diyAudio Member Join Date: Feb 2005 Location: Richardson, TX	Bump: Anyone?

24th February 2005, 04:38 AM	#7
scott_jcp diyAudio Member Join Date: Feb 2005 Location: Richardson, TX	The speakers I currently have (some cheap-ish Sony towers) have an program rating of 120 or thereabouts, and I want to be able to drive them to their potential. 56W might be loud enough though. Can you get 56 Watts out of the stereo kit, or is that the dual mono? Thanks for your help.

24th February 2005, 08:02 AM	#9
llmobll diyAudio Member Join Date: Feb 2005 Location: UCSB	If you want a bit more power: http://www.partsexpress.com/pe/showd...number=122-640

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