6 channels using audiosector kit(s) transformer / powersupply options

clearwaterms · 5th December 2006, 06:02 PM

okay,

I would like everybody to offer some advice and input, and finally hopefully answer some questions for me.

I have spoken via email to Peter Daniels and here is my plan. I would like to build a 6 channel amplifier using 1 1/2 audio sector kits. This being home theatre it's actually going to be only using 5 channels, I will keep the sixth channel down the road and because the LM4780 is a stereo chip. My question is in the transformer and power supply. The audio sector kits comes with a basic rectifier board, however I would really like to use a snubber setup. Also, how many, and what size transformers should I use. I have spoken to Peter at Audio sector and he suggested using two 300~400VA transformers and two power supply boards. Can I use two of the chip amps snubber supply boards to power 3 LM4780 chips? Each power supply would have it's own toroid. I was looking at some toroids on ebay that were 400va at 25v, would those work? Also, finally what size inline AC fuse would you recommend for this?

clearwaterms · 6th December 2006, 01:20 PM

anybody?

CarlosT · 6th December 2006, 02:28 PM

I'm sorry...total noob here...

My only comment would be that some of the channels for a home theatre do not require as big of an amp or in simpler terms as heavy duty of a transformer. You may be wise to save some money on smaller trannies for the rear channels and concentrate on heavier trannies for the front channels and sub if you're gonna drive a passive sub (gosh...do they even make these anymore?).

You could also size heatsinks accordingly but now I'm getting ahead of myself

Anyway...putting a few LMs in the same box sounds kinda cool. Good luck.

CarlosT · 6th December 2006, 02:29 PM

BTW the Jade Factor to this thread of 28:1 ain't bad

pinkmouse · 6th December 2006, 03:25 PM

Yes. Use one traffo/psu for the front two l/R channels and one traffo/psu for centre and rears.

clearwaterms · 6th December 2006, 03:49 PM

Quote:

Originally posted by CarlosT
I'm sorry...total noob here...

My only comment would be that some of the channels for a home theatre do not require as big of an amp or in simpler terms as heavy duty of a transformer. You may be wise to save some money on smaller trannies for the rear channels and concentrate on heavier trannies for the front channels and sub if you're gonna drive a passive sub (gosh...do they even make these anymore?).

You could also size heatsinks accordingly but now I'm getting ahead of myself

Anyway...putting a few LMs in the same box sounds kinda cool. Good luck.

My plan was to drive the front speakers off one power supply with a 400va transformer, and a second transformer to drive the other two LM4780 chips. those four channels would make the surrond / center channel. I email brian over at chipamps and he said that he could sell me the PCB's for the power supplies and suggested just using 3 power supply boards, so that is what I am thinking about doing. as for heat sinks, in the marketplace section of this website there is a company called DIYencousures and i was looking at there standard with the heatsinked sides. I could put two transformers and all 6 boards (3 PS and 3 LM4780 chips) in the case (i think it would fit, have to actually plan it out)

Quote:

Originally posted by CarlosT
BTW the Jade Factor to this thread of 28:1 ain't bad

im sorry, but I am very new to DIY and not exactly sure what that means

clearwaterms · 6th December 2006, 03:49 PM

Quote:

Originally posted by pinkmouse
Yes. Use one traffo/psu for the front two l/R channels and one traffo/psu for centre and rears.

can I use the Snubber set from chip amps to do this? I would be purchasing two of his kits? will that work?

pinkmouse · 6th December 2006, 03:53 PM

I would imagine so, but I'm not up on snubbers, as when I experimented a while back I found they made either no difference or sounded worse. Still I see no harm in you trying them.

Oh, and don't worry, I have no idea what the jade factor is either.

CarlosT · 6th December 2006, 03:55 PM

Quote:

Originally posted by clearwaterms
...im sorry, but I am very new to DIY and not exactly sure what that means (Jade Factor)

It means that your thread garnered few views in relation to the responses you got...so you shouldn't be disappointed

pinkmouse · 6th December 2006, 03:57 PM

Quote:

Originally posted by CarlosT
It means that your thread garnered few views in relation to the responses you got...

And is this something you just made up?

I've been on the internet since Mosaic and a 14400 modem, and I've never heard that term before.

5th December 2006, 06:02 PM	#1
clearwaterms diyAudio Member Join Date: Nov 2006	6 channels using audiosector kit(s) transformer / powersupply options okay, I would like everybody to offer some advice and input, and finally hopefully answer some questions for me. I have spoken via email to Peter Daniels and here is my plan. I would like to build a 6 channel amplifier using 1 1/2 audio sector kits. This being home theatre it's actually going to be only using 5 channels, I will keep the sixth channel down the road and because the LM4780 is a stereo chip. My question is in the transformer and power supply. The audio sector kits comes with a basic rectifier board, however I would really like to use a snubber setup. Also, how many, and what size transformers should I use. I have spoken to Peter at Audio sector and he suggested using two 300~400VA transformers and two power supply boards. Can I use two of the chip amps snubber supply boards to power 3 LM4780 chips? Each power supply would have it's own toroid. I was looking at some toroids on ebay that were 400va at 25v, would those work? Also, finally what size inline AC fuse would you recommend for this?

6th December 2006, 03:25 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Yes. Use one traffo/psu for the front two l/R channels and one traffo/psu for centre and rears. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

6th December 2006, 03:53 PM	#8
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I would imagine so, but I'm not up on snubbers, as when I experimented a while back I found they made either no difference or sounded worse. Still I see no harm in you trying them. Oh, and don't worry, I have no idea what the jade factor is either. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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6th December 2006, 01:20 PM	#2
clearwaterms diyAudio Member Join Date: Nov 2006	anybody?

6th December 2006, 02:28 PM	#3
CarlosT diyAudio Member Join Date: Oct 2006	I'm sorry...total noob here... My only comment would be that some of the channels for a home theatre do not require as big of an amp or in simpler terms as heavy duty of a transformer. You may be wise to save some money on smaller trannies for the rear channels and concentrate on heavier trannies for the front channels and sub if you're gonna drive a passive sub (gosh...do they even make these anymore?). You could also size heatsinks accordingly but now I'm getting ahead of myself Anyway...putting a few LMs in the same box sounds kinda cool. Good luck.

6th December 2006, 02:29 PM	#4
CarlosT diyAudio Member Join Date: Oct 2006	BTW the Jade Factor to this thread of 28:1 ain't bad

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