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Old 28th May 2013, 05:47 AM   #51
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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
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Old 18th June 2013, 08:43 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, 03:51 AM   #53
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vred good
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Old 22nd June 2013, 10:55 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

Amp design attempt number 2 (simpler)

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

Last edited by gootee; 22nd June 2013 at 11:00 PM.
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