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28th December 2002, 12:57 PM
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#11 |
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On Hiatus
Join Date: Nov 2002
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RIAA phono pre amp
RIAA phono amps are in fact
BASS BOOST circuits If you skip the highest lowpass filter (2122 Hz), you get a bass boost filter that boost low frequencies. It will boost most below 50 Hz and get flat at about 500 Hz So you only have to modify a RIAA feedback filter in an OPamp. And select to wanted gain, of course. -------------------------------------------  Here is a Hifi RIAA pickup amp You only tweak the filter a little! /halo - the smartest boy alive |
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28th December 2002, 01:37 PM
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#12 |
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On Hiatus
Join Date: Nov 2002
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Bass boost Feedback in OP amp
Here you see an example of a Bass boost.
This is the feedback loop from OUTPUT to INVERTING(-IN) in an OPamp. The resistor from -IN to ground, that sets the gain is not shown. You select this resistor to suit your requirements. |
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