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Chip Amps Amplifiers based on integrated circuits

8-Channel Gainclone Amplifier
8-Channel Gainclone Amplifier
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Old 29th July 2013, 12:02 PM   #41
tsiros is offline tsiros  Greece
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It would be a good idea to try to figure out how commercial multichannel amplifiers handle this
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Old 29th July 2013, 12:48 PM   #42
gainphile is offline gainphile  Australia
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They would have every channel built as one PCB and control the ground planes, or use multiple toroids/PSU?

Or just have smarter EE
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Old 30th July 2013, 08:11 AM   #43
tsiros is offline tsiros  Greece
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(posting from phone, sorry)

maybe make a super symmetrical PCB in a circular pattern? toroidal in the dead center?

a dodecahedron (δωδεκάεδρο) ?

You could even make it in two stages and still remain symmetrical. First, the four stereo amps, in the 1,2,4,5,7,8,10,11 places and then add the last four mono amps in the 3,6,9,12 places

Just throwing some ideas.
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Old 17th May 2014, 09:08 PM   #44
dakku is offline dakku
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Hi gainphile, did you manage to fix the hum issue?
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Old 9th July 2014, 01:59 AM   #45
nickthevoice is offline nickthevoice  Canada
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Default noisy...always noisy...

Hi !

I have the same problem after past 7 years to trying to build 7.1 amplifier with mono LM4780 or LM3886 and always the same result HUMMM NOISE !!!
and by the way, I use only hi-end capacitor and resistor with a really ugly sound NOISE result

For the fun, I buy cheap japan 5.1 lm3886 amp board on ebay. I plug it with the same toroidal transformer uses to build my noisy amp and you know what... THE SILENCE ! no FUC**NG humm noise ! WHY !?

Why the original gaincard with her ugly board have no noise too !
and Why the Jeff Rowland amp builded with many lm3886 in line was NO NOISE TOO !?

In reality I think all members how try to build amp with lm4780 or LM3886 accept the noise, but not me, and I always search to find a REAL SOLUTIONS...for the SILENCE

I don't want to change your thread, MP if you have solution, thanks !

nicK



P.s. If you drive your CHIP in 4ohm or 8ohm your heatsink is too tiny! I use 6x4inch heatsink and after 1 hours of loud music, I can't leave my finger on it
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