A new chip amp project

JOE DIRT® · 5th June 2003, 01:49 AM

I was doing some more unpacking today and ran into a plathora of samples I stuck in a unmarked box...Low and Behold I can across a pair of LM3886TF`s...I forgoit all about receiving them a year ago.....so I looked up the specs on them and they seem pretty good they are part of the Overture line....this works out perfect because I found a pair of STK4042`s also the other day....so thats two amps to build now!!!haha...I am thinking of making a nice surround amp with the 3886`s and maybe a centre channel with the STK`s

Cheers!!The DIRT®

JOE DIRT® · 5th June 2003, 01:52 AM

jleaman · 5th June 2003, 04:07 AM

ok that is it. i have to ask where do you get samples from in canada as i would like to build the gain clone but no mula right now my plann is to get the chips and start the case and ect and work with the things that i can get for free right now.

where can i get free samples to start my stereo gain clone.

Any one...

JOE DIRT® · 5th June 2003, 04:26 AM

I got them from National directly.....they still give away samples although you pay shipping now (new rule)....they are sending me 50 bucks worth for 10 bucks....pretty cheap

Cheers!!The DIRT®

jleaman · 5th June 2003, 04:52 AM

how do i get a hold of them and get some parts like that so i can build some chip amps. Can you email me how you did it so i can contact them i can pay the shipping but i cant afford parts right now.

carlosfm · 9th June 2003, 01:23 PM

Hi Joe,

Please don't use a different chip for the centre channel.
You should use the same chip all around.
What kills AV is people having different speakers / amps for front, centre and surround.
Please do it, but choose only one chip type for all channels.

If I were you, I'd choose the LM3886.
It sounds excellent.
BTW, do you need help unpacking?

JOE DIRT® · 16th June 2003, 06:32 PM

I rigged this up on the weekend to start testing the chips...the system is Line isolated with the transformer on the left the toroid and EI* transformer will power the amp....there is a 35 amp bridge on a small heat sink and there are the 2 15 000 uf 80 volt caps

the heat sink is home made....this is all temporary

JOE DIRT® · 16th June 2003, 06:34 PM

the Heatsink:

carlosfm · 17th June 2003, 10:14 AM

JOE,

Are you going to use the LM3886?
What voltages are those transformers?

pinkmouse · 17th June 2003, 10:48 AM

Quote:

Originally posted by JasonL
how do i get a hold of them and get some parts like that so i can build some chip amps. Can you email me how you did it so i can contact them i can pay the shipping but i cant afford parts right now.

In the belief that anything worthwhile has to involve a little sweat, just go to the National website, (google works), and do some digging. It's all there if you look

5th June 2003, 01:49 AM	#1
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	A new chip amp project I was doing some more unpacking today and ran into a plathora of samples I stuck in a unmarked box...Low and Behold I can across a pair of LM3886TF`s...I forgoit all about receiving them a year ago.....so I looked up the specs on them and they seem pretty good they are part of the Overture line....this works out perfect because I found a pair of STK4042`s also the other day....so thats two amps to build now!!!haha...I am thinking of making a nice surround amp with the 3886`s and maybe a centre channel with the STK`s Cheers!!The DIRT®

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5th June 2003, 01:52 AM	#2
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON

5th June 2003, 04:07 AM	#3
jleaman Banned Join Date: Apr 2002	ok that is it. i have to ask where do you get samples from in canada as i would like to build the gain clone but no mula right now my plann is to get the chips and start the case and ect and work with the things that i can get for free right now. where can i get free samples to start my stereo gain clone. Any one...

5th June 2003, 04:26 AM	#4
JOE DIRT® diyAudio Member Join Date: Apr 2003 Location: Brantford, ON	I got them from National directly.....they still give away samples although you pay shipping now (new rule)....they are sending me 50 bucks worth for 10 bucks....pretty cheap Cheers!!The DIRT®

5th June 2003, 04:52 AM	#5
jleaman Banned Join Date: Apr 2002	how do i get a hold of them and get some parts like that so i can build some chip amps. Can you email me how you did it so i can contact them i can pay the shipping but i cant afford parts right now.

9th June 2003, 01:23 PM	#6
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Hi Joe, Please don't use a different chip for the centre channel. You should use the same chip all around. What kills AV is people having different speakers / amps for front, centre and surround. Please do it, but choose only one chip type for all channels. If I were you, I'd choose the LM3886. It sounds excellent. BTW, do you need help unpacking?

17th June 2003, 10:14 AM	#9
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	JOE, Are you going to use the LM3886? What voltages are those transformers?