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Old 12th June 2014, 06:14 PM   #11
davym is offline davym  Scotland
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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
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Old 12th June 2014, 06:45 PM   #12
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Quote:
Originally Posted by davym View Post
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.

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I looked at the math involved (never my strong point) Click the image to open in full size.
It's trivial algebra that can be calculated with an engineering calculator.
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Old 12th June 2014, 06:58 PM   #13
davym is offline davym  Scotland
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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!
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Old 13th June 2014, 07:19 AM   #14
AndrewT is offline AndrewT  Scotland
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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.
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