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?
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?
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 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 said:
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)
CarlosT said:
im sorry, but I am very new to DIY and not exactly sure what that means
pinkmouse said:
can I use the Snubber set from chip amps to do this? I would be purchasing two of his kits? will that work?
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. 😉
Oh, and don't worry, I have no idea what the jade factor is either. 😉
clearwaterms said:
It means that your thread garnered few views in relation to the responses you got...so you shouldn't be disappointed 😀
CarlosT said:
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.
Yes...fresh off the Mind of Carlos...motivated by this forum's general viscous nature 😀 😉
14,400? Geez...I'm not that old and I remember 9,600 baud modems 😀
14,400? Geez...I'm not that old and I remember 9,600 baud modems 😀
pinkmouse said:
If I wanted to use a seperate PS for each amp PCB can I power two PS's on one toroid?
pinkmouse said:
about the same time I first got on. Lynx and a 14400 modem, before AOL was web enabled.
clearwaterms said:
You could, but I wouldn't worry about it, save the pennies for a couple of new DVDs to watch on your new system!
pinkmouse said:
okay, now im lost. The most expensive portion of the amp is the transformer, so by powering several PS's off of one toroid it would save me money.
So i guess now I have a few new questions.
how would everybody recommend I power this? I am getting the feeling I should use two transformers, both rated at 400VA, and two power supplies. One for the main two channels and the other for the four surrond channels. My question is can I use a chipamp snubberized power supply to power 2 LM4780 chips? and if I can not, can i use one transformer to power two power supplies? Brian over at chip amp suggested using three independant power supply boards. If I do that can I use 2 transformers to power the three supply boards? i would be using 400va transformers, one for the main board and one for the other two boards.
finally, if I use a 400va 25v transformer will that give me the 60w per channel output I am hoping for? and if not how much will it give me.
Forgive me, I am not a technical guru, I can read a schematic, and solder a board together... past that, I am only regurgitating information I read here and other websites i have found
Nordic said:
could you please elaborate? are you talking about grounding? I am concerned about ground hum with this many power supplies
Each chip will have its own rectifier and say 2 large caps for filtration.
Yeah I know one can do more, but trust me these chips have high noise rejection built in. Ultimately useing the KISS principle ground loops are unlikely to be a problem.
Just make sure to use your transformer centre tap your earth ground star.
I would spend a bit of time thinking about thermal management with that many chips, and I don't just mean heatsinks... the chip radiates heat on both sides...
Yeah I know one can do more, but trust me these chips have high noise rejection built in. Ultimately useing the KISS principle ground loops are unlikely to be a problem.
Just make sure to use your transformer centre tap your earth ground star.
I would spend a bit of time thinking about thermal management with that many chips, and I don't just mean heatsinks... the chip radiates heat on both sides...
Nordic said:
remember that this is a home theatre enviroment, so while there are 6 channels of audio they will not all see simultanious use. only five of the channels will ever be used, and while three of the channels will see regular use (fronts and center) the other three will see very limited use.
that being said, is a fan something that I should consider?
maybe, but I have bigger concerns, this is by no means a straight forward project.
How will you be manageing volume levels etc.
Go draw out the backplate and see how quickly things get complicated.
Haveing a nice receiver with preamp outputs would be realy convenient, then you could power each speker with its own build in amp and have volume control at your fingertips by remote...
How will you be manageing volume levels etc.
Go draw out the backplate and see how quickly things get complicated.
Haveing a nice receiver with preamp outputs would be realy convenient, then you could power each speker with its own build in amp and have volume control at your fingertips by remote...
Nordic said:
I am currently using a yamaha HTR-5650 (i can't remember if that is the exact model number) reciever which has DII and DTS and and a remote, etc. It also has preamp outputs, which is how I intend to hookup this amplifier. as for the backplate, I have not considered that, I will have to do some drawing here in the near future.
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