Variable EQ for Cornet Phono

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gnnett

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Variable EQ for Cornet Phono
« on: 20 Sep 2015, 03:26 am »
Hi

Need a bit of help with the above project and have used Jim Hagerman's eq calculator linked here  ( http://www.hagtech.com/equalization.html ) and come up with the following results.

From the calculator I have Ra=60.953kOhm and Rc=71.819kOhm for the standard Cornet RIAA.

Using these as target values I have EMI requiring Ca (C7)=32nF and Rb (R13)=9.91kOhm and Cb (C8)=842pF and Rd (R23)=3.78kOhm.

I will have to compromise for standard component values, but would be useful if someone could advise just how close I need to get with values for Ra and Rc, +/- 1%, or 10%?

Kind Regards

Grant
« Last Edit: 20 Sep 2015, 05:47 am by gnnett »