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Old 8th October 2004, 05:01 PM   #1
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Default Embarking On A Gainclone 5.1 Channels

What comments welcomed

I am using two LM4781 for total of 3x2 = 6 channels
One will be for the sub and a preamp to drive the vu meters, lm 3915.
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Old 8th October 2004, 11:18 PM   #2
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I just "finished" a five channel amp.. It still needs a lot of case work and a proper power switch. Also Ill add another channel to power a sub eventually (5 channels are lm3875, the sub will be 2 lm3886)

Is 35W enough for your sub though?


What size/voltage transformer do you have, and heatsinks?


For mine I have a very low voltage (18.5V DC) so the chips barely need heatsinks at all. Its the transformers that get the warmest, I should add some air holes above it.


Make sure you have a lot of wire around if your doing star ground, mine is a rats nest.
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Old 9th October 2004, 08:28 AM   #3
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did u seen microjean pcb layout, Click the image to open in full size.
Click the image to open in full size.

look good, I might want to use that.
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Old 9th October 2004, 01:56 PM   #4
fireman is offline fireman  Canada
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Quote:
Originally posted by Alphas
did u seen microjean pcb layout, Click the image to open in full size.
Click the image to open in full size.

look good, I might want to use that.
Alphas,

Your pictures don't show !

Could you post a link or something ?
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Old 10th October 2004, 07:37 AM   #5
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Quote:
Originally posted by fireman


Alphas,

Your pictures don't show !

Could you post a link or something ?
I notice that too


Click the image to open in full size.
Click the image to open in full size.
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Old 29th October 2004, 03:52 AM   #6
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Alright I got a bunch of LM4781s, LM3886s, LM3915s, LM1973s and LM1972s. Now I intend to make a 7.1 channels project, the total wattage may exceed 250watts, any comments?
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Old 31st October 2004, 09:57 AM   #7
mAJORD is offline mAJORD  Australia
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well if you can't see those layouts now you got eye problems :P


btw, whats all the digital gear down the bottom of the schematic ?
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Old 31st October 2004, 03:37 PM   #8
Riku-78 is offline Riku-78  Finland
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Didn't take the time to parse the whole schematic, but it appears you have implemented some sort of digital control. What kind of parameters can you control? I doubt there is an Atmel microcontroller, RS-232, IR remote, LCD display and a front panel push button interface just to assign attenuation.
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Old 1st November 2004, 06:13 AM   #9
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yeap, there will be digital controls for each channel, the LM 1973 and Lm1972 are the digital volume controls, but I am doing away with the irda remote control, RS232 but adding vumeter, front panel attentuation interface and LCD into the amp.

The circuit is based from microjean 6 channels, but this is for 7.1 channels, = 8 channels. But from where I lived, there is a hard time trying to make a PCB out of the schematic.
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Old 1st November 2004, 08:34 AM   #10
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Hy there!

The board I designed is for my needs. I like programming the microcontrollers and audio makes no difference.

The digital interface is designed for debugging purpuses. The final board (if will ever be final) doesn't need all those chips like 2 memory modules, rs232 interface etc.

The schematic has been changed in the mean time, temperature sensor was added, fan control and some volume interface gagets (work in progress , http://microjean.go.ro ).

Bye...for now!
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