RIAA Equalizer Amplifier Design
This article explores the intracacies of phono amplifier design, culminating in a few practical designs. Special emphasis is placed on overload margins (critical if you want good sonics from your EQ amp), driving the EQ network adequately and noise.
Below is the RIAA Calculator Excel spread sheet. Please read the article above, before attempting to use the tool below. Once you have calculated your RIAA values, you are strongly encouraged to check your design out using a spice model – I use LTSpice, but any Spice simulator will work.
Here are some guidelines to help you use the spreadsheet tool:-
Here is an excellent noise calculator developed by Stuart Yanniger that allows you to calculate the real world noise of any cartridge. This spread sheet does NOT include amplifier noise, but instead shows just how much noise the cartridge+loading resistor combination produce. For the most part, it far exceeds that of any competently designed RIAA equalizer preamplifier