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Phono preamp with precision RIAA equalisation

4 years ago 2948
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One channel of a moving magnet phono cartridge preamp with very accurate conformance to the RIAA qualisation curve, based on the design shown in Fig 16 of:

but with the addition of R10 and C8 to remove severe HF peaking in V(BUF) at >100kHz due to capacitive loading of U1 by the input of the bandpass filter implemented by U3.

Fork the project and then press CTRL+R to run the simulation.

Set one and only one of the 'ac' (frequency domain analysis) or 'tran' (time domain analysis) spice directives to have 'text type = spice' in right hand panel.

Note that the time domain plot takes some time to settle into steady state due to frequency response of the amplifier.


Moving magnet phono cartridge preamp


ID Name Designator Footprint Quantity
1 OP27_AD U1,U2,U3,U4 DIP08 4
2 SIN(0 100m 1k) AC 1 0 V1 2P-5.0 1
3 {VS} V2,V3 2P-5.0 2
4 47k R11 R0805 1
5 11k R1,R9 R0805 2
6 10k R2 R0805 1
7 100k R3 R0805 1
8 22k R4 R0805 1
9 91k R5 R0805 1
10 220k R7,R6 R0805 2
11 68k R8 R0805 1
12 330n C5 C0805 1
13 22n C2,C3,C4 C0805 3
14 27n C1 C0805 1
15 330p C6 C0805 1
16 470p C7 C0805 1
17 75 R10 R0805 1
18 430p C8 C0805 1


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