DC blocking for LM3886 chip amp
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 Chip Amps Amplifiers based on integrated circuits

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 12th June 2014, 06:14 PM #11 davym   diyAudio Member   Join Date: Jul 2013 Location: The Wetback I looked at the math involved (never my strong point) Think i'll just fit the specified cap and compare SQ - later. World cup football (soccer) starting now on tv and cold beer in fridge. Much less taxing on the brain
Fast Eddie D
diyAudio Member

Join Date: May 2010
Location: Skokie Il
Quote:
 Originally Posted by davym Thanks Eddie, I didn't even think about bypassing the electrolytic but there is space on the underside of the PCB where I can fit a film cap. Need to do some calculations now...
Commercial equipment employs this technique sometimes.

Quote:
 I looked at the math involved (never my strong point)
It's trivial algebra that can be calculated with an engineering calculator.

 12th June 2014, 06:58 PM #13 davym   diyAudio Member   Join Date: Jul 2013 Location: The Wetback I should just about get my head around the maths. It would probably be more entertaining than the bloody awful opening ceremony I just watched. To think they actually paid someone to come up with that!
 13th June 2014, 07:19 AM #14 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders Mathematics? No. 1 / [ 2*Pi*R*C ] That is primary school arithmetic. Pi ~ 3.14 R ~ input impedance of the amplifier C ~ your chosen input capacitor in Farads (1uF = 0.000001F) If the frequency is one decade below your required bandwidth then you have arrived. __________________ regards Andrew T.

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