Reverse RIAA Equaliser

Posted on Nov 18, 2012

I came up with this idea when I was in a situation where ... * I had an amplifier with an unused RIAA input and * I was missing another input for a standard audio signal at this amplifier. So I designed a miniature passive network to convert a normal audio signal into the signal that phono inputs require.

Reverse RIAA Equaliser
Click here to download the full size of the above Circuit.

As the amplification of a phono input is quite high, this pre-equaliser network can be made completely passive. The frequency response of the current through the network formed by R1, R2, C1 - C4 corresponds to the inverse of the standard RIAA curve, so t

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