RIAA Phono Equaliser

Posted on Jun 26, 2012

Vinyl equalisation (EQ) has been with us in a stable and predictable form for quite a long time, but for those who are interested in the old 78 rpm records there are a great many problems to overcome. One of these is obtaining a turntable that runs at 78 rpm, and preferably has the range to cover the somewhat variable actual recording speed, which can apparently be anything from 60-odd to over 84 rpm.

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

The next obstacle is finding a suitable stylus again, these are hard to get, and modern ones are usually too small for the larger grooves used back then Finally, there is the vast number of EQ "standards" that were used, ranging from no

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