| The Dudster |
Been lurking on the forum for a while and have seen many threads regarding gainclone PCB's. None of them seems to be complete though, the person who designed them forgot a trace here, a component there or made the tracks to narrow for high currents.
Is there someone out there who has layout files for a fully working PCB? It just needs to be a very simple layout like the one on the application note. I need to build 24 channels in one enclosure, so the PCB have to be small. They will be run from a dual supply of +/- 14 VDC driving 12 x 6ohm tweeters and 12 x 5" 4ohm woofers. For my surrond speakers...
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| The Dudster |
Eeeeeh, Ok, I should have searched. Sorry.
Thanks though, just what I need and it was so sexy too, red and all.
BAF |
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| Nuuk |
It sounds like http://www.fedde.tk ]Fedde[/URL] is the guy you need to contact. He has PCBs finished and they are ultra-compact.
PS He is in Holland. |
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| uvodee |
so this question is most likely stupid.
I understand the stereo set up of an amp you have 2 channels a left and a right.
But if you want to start to build a 4.1 , 5.1 6.1 or as it seems a 7.1
how does one go to split up the channels into rear, front and center etc... channels
do you need some kind of electronic splitter that splits each of the 2 incoming source channels into multiple or how does that work?
plpease not toooooo technical, I was born stupid!
J-P |
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| Optical |
usually the source (computer/dvd player etc) will have the 5.1 7.1 whatever outputs..
so its a simple matter of having enough amplifiers for each channel |
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| S.C |
| I "think" building a DAC which support mutipule channel will work too. |
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| uvodee |
I have been looking at an old Pioneer system with surround sound
front R L, rear R L and center speaker
I can hear definitely different sounds coming form different speakers (depending on the film ofcourse) but the dvd out is only 2 rca jacks for audio ( frankly I have never seen a cable leaving a dvd player that had more than 2 rca jacks for audio....
for a DAC can you give me an 'easy' schematic
I would like to look at that and I understand that for each speaker I would need it's own amp so for a 6.1 i would need 7 amps, but considering the small space a gc takes i could do all of that in a relatively small enclosure seperated from the powersupply
J-P |
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| tg3 |
The 'better' HT receivers have separate preamp outputs for each channel. If you're going to roll your own amps, then you should consider a HT preamp/processor like the Outlaw Model 950.
There are no DIY solutions for a HT receiver because of licensing issues.
Here is the rear panel of the 950 with all the preamp outputs (and other connectors).
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| S.C |
| quote: | Originally posted by S.C
I "think" building a DAC which support mutipule channel will work too. |
Sorry man you missed my bold letter...... I think I just think it will work that way, but I don't have any actrual edvience. Sorry, I can't help u.:bawling: |
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| theChris |
"Been lurking on the forum for a while and have seen many threads regarding gainclone PCB's. None of them seems to be complete though, the person who designed them forgot a trace here, a component there or made the tracks to narrow for high currents.
Is there someone out there who has layout files for a fully working PCB? It just needs to be a very simple layout like the one on the application note. I need to build 24 channels in one enclosure, so the PCB have to be small. They will be run from a dual supply of +/- 14 VDC driving 12 x 6ohm tweeters and 12 x 5" 4ohm woofers. For my surrond speakers..."
-well, i think short of no PCB, my lm4780 mirco-board is still the smallest. but it is as you mentioned imperfect. it works fine. but is a nightmare to use, i still don't have a pic of it, but it was 1.2" x 2.2"
in anycase the lm4780 or 4732 will give you the highest channel-density.
that beutiful red PCB is also pretty small, and a few others offer PCBs now. i know there is a group lm3875 (with a forced solder to pin resistor, so i guess not complete).
i'm also selling multi-purpose 4x channel lm3886 boards and hopefully 4780/4732 boards. expected to be ready to ship a little over a week. |
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| S.C |
| My Old ugly LM3875 board is 1.75"X.75" for one channel.......... Smaller:D |
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| theChris |
| impressive. per channel it's a few hundereths of an inch smaller too! |
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| neutron7 |
| quote: | Originally posted by theChris
that beutiful red PCB is also pretty small, and a few others offer PCBs now. i know there is a group lm3875 (with a forced solder to pin resistor, so i guess not complete).
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That is supposed to be like that to decrease the signal path of the feedback resistor. not because it is incomplete :) |
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| Alcaid |
| What about this PCB for the OPA541AP? 1.775 x 1.350, and that is just because of the big 2200uF Panasonic FCs (50V). Same solution here (to solder the NFB resistor on the chip). |
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| The Dudster |
| quote: | Originally posted by Nuuk
It sounds like http://www.fedde.tk ]Fedde[/URL] is the guy you need to contact. He has PCBs finished and they are ultra-compact.
PS He is in Holland. |
Nahhh, I am now in love with a sexy red PCB!!!
:-)
Thanks though.
BAF |
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| The Dudster |
Aaaaaaaaaaaaand I am in love again...So, no more GainClone, here I come, OPA!!!
Nice and small, now just need to etch 24 pieces.
Is there anywhere I can obtain the real layout file for this?
BAF |
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| S.C |
| I think I head it right that gainclone is just chips with less part...... so it doesn't matter what chip you are using...... Am I right?:confused: |
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| Tensop |
one of those 2 images should work :) |
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| Tensop |
and, the overlay...
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| theChris |
note, for compatibility with the 3886 IC, pin 5 must connect to pin 1. not sure if this is 100% _required_ for the thing to work, but i assume pin 5 was placed there for a reason.
the board listed also sits the IC on top of a resistor.
as for my opinion on the lm3875 group order PCB, it is intentionally limiting. you focus on "intentionally", while i focus on "limiting". |
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| Tensop |
| quote: | Originally posted by theChris
note, for compatibility with the 3886 IC, pin 5 must connect to pin 1. not sure if this is 100% _required_ for the thing to work, but i assume pin 5 was placed there for a reason.
the board listed also sits the IC on top of a resistor.
as for my opinion on the lm3875 group order PCB, it is intentionally limiting. you focus on "intentionally", while i focus on "limiting". |
pin 5 is linkable via a wire link, and the resistor underneat the IC isnt an issue.. ive built this pcb before and it works
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| The Dudster |
Yey, thanks for the post of the layout files for the PCB's. No more OPA, back to LM3886. So, I guess it is just to print now and etch and buy the hardware and solder and power it up and enjoy the sound of 6 floor standing surround speakers. Actually, 12 x 5" woofers equals the area of a 15" woofer. Massive! Smaller excursion than a 15" though...:-(
:-)
BAF |
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