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Old 8th June 2009, 07:16 AM   #1
suds is offline suds  India
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Default LM3886 - AD815 Bases Amps

Hi,

I would be making LM3886 based Power Amplifier,
Stereo , and 5.1ch amp.

The design will be beased on carlosfm, Application Notes, and other circuit.


Also, Many DIY'ers in India are not able to source PCB for carlosfm project AD815 pre with LM3886. I need consent from authors and
moderators, If I can make PCB and post GB for Indian DIY'ers

Thanks
suds
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Old 8th June 2009, 08:28 AM   #2
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Use the e-mail button and PM the authors. You cannot expect them to follow all threads 24/7 and find yours.
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Old 8th June 2009, 08:36 AM   #3
suds is offline suds  India
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Thanks! will do it.
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Old 8th June 2009, 09:11 AM   #4
Electrons are yellow and more is better!
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Alternative to AD815 is the TPA6120a, more or less the same IC and THS6012 is identical to TPA6120 except for tighter specs.
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Old 8th June 2009, 09:13 AM   #5
Electrons are yellow and more is better!
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Quote:
Originally posted by pacificblue
Use the e-mail button and PM the authors. You cannot expect them to follow all threads 24/7 and find yours.
I'm afraid the are banned here but Carlos can be seen at diyhifi.org and I'm sure several members here have his email address.
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Old 8th June 2009, 09:14 AM   #6
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Only they don't sound anything like the AD815 in my experience.
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Old 8th June 2009, 09:30 AM   #7
Electrons are yellow and more is better!
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Did each IC have optimal working conditions? Sometimes when you compare, one of the test object works good but the other one maybe needs a different environment. As for power stage to drive headphones, the TPA6120 is excellent.
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Old 8th June 2009, 10:01 AM   #8
Gopher is offline Gopher  United Kingdom
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analog sa - are you saying the TPA6120A and THS6012 sound better or worse than the AD815? I've read lots of stuff about the 815. Is it really that good?
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Old 23rd June 2009, 01:47 PM   #9
suds is offline suds  India
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My AD815 pre-amp PCB layout. .
based on carlosfm ad815 pre.

ad815 smd version is used here..
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File Type: jpg cfm-diy-adpre-reva1.jpg (70.7 KB, 429 views)
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Old 23rd June 2009, 02:07 PM   #10
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Quote:
Originally posted by peranders
Did each IC have optimal working conditions?

Don't know about optimal but they were identical - same Jung regulators, raw dc and attenuator. And i only tried the TPA6120. No idea how good either is as a headphone amp as i only tried them in a line stage comparing the sound of an active stage to a bypass. The AD815 is really amazingly transparent for an opamp but ultimately did not entice me to use it as a line stage in the long term. I guess it's a quiestion of taste, priorities and expectations of what a line stage should achieve. For almost a year i used and enjoyed a Pass Aleph 1.0 clone which is nowhere near as transparent and currently use a choke loaded 5687 common cathode stage which is simply in a different class.
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