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Old 28th December 2002, 12:57 PM   #11
halojoy is offline halojoy  Sweden
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Join Date: Nov 2002
Arrow 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.
Click the image to open in full size.
Here is a Hifi RIAA pickup amp
You only tweak the filter a little!

/halo - the smartest boy alive
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Old 28th December 2002, 01:37 PM   #12
halojoy is offline halojoy  Sweden
On Hiatus
Join Date: Nov 2002
Arrow 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.
Attached Images
File Type: gif bassboost.gif (3.4 KB, 411 views)
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