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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: RIAA Circuit posted by Prometheus on March 23, 2002 at 07:37:10:
The RIAA network I most commonly see consists of a series resistor followed by two shunt capacitors. The larger capacitor shunts through a resistor, and the smaller one goes directly to ground. The series resistor should be 6.88 times the value of the shunt resistor. The product of the series resistor and the large shunt capacitor should be 2187 microseconds and the product of the shunt resistor and the small shunt capacitor should be 109 microseconds. These values are from 'The Art Of Linear Electronics' by John Linsley Hood, published by Butterworth Heinmann.Many people like to add a resistor between the small shunt capacitor and ground to give a break at 3.18 microseconds.
To compensate for the output impedance of the preveous amp stage, reduce the value of the series resistor by the output impedance and leave the other components unchanged. If you ever decide to design an RC coupled phono stage, I think you need to increase the value of the series resistor so that Rp+Rs//Rg gives the correct value for the ideal series resistor for the equations above.
Good luck with your project, and have fun. Let us know how it turns out.
Paul
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Follow Ups
- Re: RIAA Circuit - Paul D. Scearce 16:24:37 03/24/02 (1)
- Re: RIAA Circuit - Kurt Strain 22:00:25 03/24/02 (0)
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