Passive/Active RIAA EQ For
Semiconductor Phono Amplifier


Using this page you can calculate the component values for an active/passive RIAA equalization stage.

How to use the calculator:

  • Select a value for C1 and C2
  • Select the gain of the whole stage (including the attenuation of the passive stage) at 1kHz
  • Press “Calculate resistors”
  • The form calculates the exact values for R1 to R2. Resistors are usually not available with exactly these values. However, with a parallel circuit of two E24 resistors, you can often approximate these values quite good. The calculator finds 2 E24 resistor values that best matches the value.

Inputs
C1 = nF
C2 = nF
Gain = db @ 1kHz   



Calculations
Attenuation 1st stage = db @ 1kHz
Voltage gain 2nd stage = = dB @ 1kHz

R1 = kΩ = kΩ   parallel    kΩ = kΩ
R2 = kΩ = kΩ   parallel    kΩ = kΩ
R3 = kΩ = kΩ   parallel    kΩ = kΩ
R4 = kΩ = kΩ   parallel    kΩ = kΩ






RIAA Playback Curve
Attenuation in dB relative to 1kHz


> Frequency

> Attenuation in dB

 

> Frequency

> Attenuation in dB

10

19.74

 

1000

0

20

19.27

 

1200

-0.61

30

18.59

 

1500

-1.4

40

17.79

 

1800

-2.12

50

16.95

 

2000

-2.59

60

16.1

 

3000

-4.74

80

14.51

 

4000

-6.61

100

13.09

 

5000

-8.21

120

11.85

 

6000

-9.6

150

10.27

 

8000

-11.89

180

8.97

 

10000

-13.73

200

8.22

 

12000

-15.26

300

5.48

 

15000

-17.16

400

3.78

 

18000

-18.72

500

2.65

 

20000

-19.62

600

1.84

 

30000

-23.12

800

0.75

 

40000

-25.6






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