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Chip Amps Amplifiers based on integrated circuits

Best LM1875 Circuit?
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Old 12th October 2013, 09:44 PM   #21
danielwritesbac is offline danielwritesbac  United States
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Originally Posted by AndrewT View Post
. . . A series impedance followed by a shunting capacitor can serve as a low pass filter. The voltage drop has nothing to do with the filtering action. The dynamic impedance of the diode to the applied frequency is what creates the impedance that is one half of that low pass filter.
Thank you! Yes, that explanation makes better sense.
Originally Posted by gootee
Hey Daniel, Did you ever try taking the positive rail's decoupling caps to the negative rail instead of to ground (with the negative rail's decoupling still going to ground)?
Surprisingly, I haven't tried that one yet. Have you tried it?
I have tried a 4.7uF 250v electrolytic from rail to rail located at the power vias of the amplifier board.
Originally Posted by riko4628
Is the output resistor 0.5 or 1W?
It could be convenient if your layout has spacing for a 1W resistor in the output RC.
Originally Posted by riko4628
And second thing, is the 2u2 capacitor electrolytic? Do you mean 2,2uF Ceramic?
The input coupling cap is 2.2uF BP (or ordinary) electrolytic and you can add a small polyester dip cap (range 1n to 10n) to it if desired for treble qualities. Alternatively, a polyester 2.2uF can be used.
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Old 12th October 2013, 09:56 PM   #22
riko4628 is offline riko4628
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Thank you so much Daniel
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