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Chip Amps Amplifiers based on integrated circuits

8-Channel Gainclone Amplifier
8-Channel Gainclone Amplifier
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Old 20th July 2013, 08:16 AM   #21
gainphile is offline gainphile  Australia
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I'm a fan of the new Daftpunk album. It's a great recording with awesome dynamics and deep synthesized bass.

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At normal living room listening level I have no issues with this 8-channel GC to drive my 4-way speakers. However sometimes my house is empty and I'd like to listen at 'discotheque level'. The sub runs out of steam without ever reaching xmax. So it's an amp problem.

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Hence another 4-channels are added, making this amp a 12-channels. The 4-channels are bridged to drive the Subwoofer pair. In theory the amp will be happy to drive 2 ohms load.

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I'm testing it with my much updated 4-seconds finger touch method . So far so good with temperature not passing 70C albeit the tiny heatsink. But this is winter with in-room temperature of 19C.

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Old 20th July 2013, 09:22 AM   #22
ajst2duk is offline ajst2duk  Australia
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I'm a big fan of that Daft Punk album - it's just a liquid wall of sound
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Old 20th July 2013, 09:34 AM   #23
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by ajst2duk View Post
.................. it's just a liquid wall of sound
Is that the same as a puddle on the floor?
What has that (liquid wall) got to do with audio sound quality?
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Old 20th July 2013, 10:13 AM   #24
midyim is offline midyim  Australia
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Default PCB Source?

Gainphile,

Where did you source the Rectifier PCB?

Thks...
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Old 20th July 2013, 11:03 AM   #25
gainphile is offline gainphile  Australia
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The whole kit is Audiosector 4780 amp. Very recommended
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Old 20th July 2013, 09:32 PM   #26
midyim is offline midyim  Australia
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Thanks....shame he doesn't sell the Rectifier PCBs separately


Quote:
Originally Posted by gainphile View Post
The whole kit is Audiosector 4780 amp. Very recommended
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Old 21st July 2013, 04:56 AM   #27
ajst2duk is offline ajst2duk  Australia
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Quote:
Originally Posted by AndrewT View Post
Is that the same as a puddle on the floor?
What has that (liquid wall) got to do with audio sound quality?
Well it's just a throw away subjective thought bubble - I like it because it seems to have great dynamic range and I can turn it up loud and the simplicity of the sound and great base notes make it feel from an SPL point of view like I'm at a great concert - and my pot addled memory of a great concert was that it was like standing in front of a wall of sound.
These concepts are probably far too random for you - just accept that I might not be able to explain it to your satisfaction and move along.
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Old 22nd July 2013, 12:53 AM   #28
gainphile is offline gainphile  Australia
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Yeah the recording throws a rich spectrum of sound and dynamics. This coupled with awesome bass. I guess you can't please everyone

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The paralleled 4780 still runs out of steam. Checking the voltage on loud passages of this recording I found the voltage dropped down from 35v to 25v at the PSU. So an upgrade from measly 160VA to 500VA

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Old 22nd July 2013, 02:02 AM   #29
_henry_ is offline _henry_  Australia
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hi andi,

i wish u are in sydney , great projects there. i always curious about peter's chipamp, they seem a very very good quality, and knowing his standards i suspect it is a high performance chipamp.

cheers
henry
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Old 23rd July 2013, 02:48 AM   #30
gainphile is offline gainphile  Australia
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With Melbourne weather this week I wish I was in Sydney too!

Peter Daniel's 4780 kit is awesome both in quality and size. Can't complain really.

I have problems now with the new transformer.

- It hums and buzzes mechanically. Some quick research it seems due to DC voltage. I deployed DC blocking circuit here but it does not go away.

- The speakers also hum. I need to find out why. Already have single point of ground in the system but it still hums.

Some sleepless night this week I guess ... I hope it's not due to the poor quality of the Transformer. Cost me heaps.
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