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Chip Amps Amplifiers based on integrated circuits

LM1875 vs LM3886
LM1875 vs LM3886
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Old 28th May 2013, 06:47 AM   #51
abraxalito is offline abraxalito  United Kingdom
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If your definition of 'rich' is based on salary alone then most probably you're richer than me as I'm only in part-time paid employment at the moment

I still continue to maintain you're not very close to getting the best from your LM1875 with that PSU. But hey its your project
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan
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Old 18th June 2013, 09:43 PM   #52
lsheng is offline lsheng  United States
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Default I am not sure

Maybe discussed somewhere else, as in simulation I see 1V peak to peak ripple on a 10000uF cap with regular bridge rectifier when 1A is consumed(8W at 8Ohm speaker, 4w AT 4Ohm). 2200uF the ripple will be 4V. This is equivalent power of 0.25W at 8Ohm, with superior PSRR it maybe still ok. But you supply will effective drop 4V to provide unclipped sound. I think this is bad. If you consider cross modulation, it is even worse, in theory it will give unlean sound(frequency other than harmonic of original signal).

Originally Posted by bimo View Post
No, 2200uF is enough for this 25Watt amplifier. More caps only give small benefit on bass at full power.
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Old 19th June 2013, 04:51 AM   #53
apple1860 is offline apple1860
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vred good
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Old 22nd June 2013, 11:55 PM   #54
gootee is offline gootee  United States
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You can just CALCULATE the minimum required reservoir capacitance, as in the linked post at


Note that the needed Vclip value is plotted in the LM1875 datasheet, versus the rail voltage.

Last edited by gootee; 23rd June 2013 at 12:00 AM.
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Old 16th August 2018, 11:59 PM   #55
Eftegarie is offline Eftegarie  Netherlands
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Read through and enjoyed this topic from over 7 years ago which I think is still relevant today.
As I understand both are very good clean amplifier chips, one rated 30 Watts the other 60 Watts.

1. Wondered weather anybody has gained new insights in the past 7 years?

2. Measured with a precise laboratory instrument, what is the rated (or advertised)...

...Total Harmonic Distortion + Noise oof the LM1875 @ 10 Watts output?
...Total Harmonic Distortion + Noise oof the LM3886 @ 10 Watts output?
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