dINgO as RIAA pre amp

[Joe Malone]

The passive RIAA in the link below will work with the dingo perfectly.

http://www.kabusa.com/riaa.htm

RIAA R1 mounted between out and in unbalanced terminals on dINgO.
RIAA R2 in series with C1 fitted to position R25 on dingo.
RIAA C2 = C8 on dingo

Converting the balanced input amp to unbalanced low noise input with impedance set for 47k for moving magnet.

Resistor changes
R1 = 100k
R2 = 4k7
R3 = 0R
R4 = 100k
R5 = 150R
R6 = 20k

Capacitor changes
C3 = Cload recommended for your cartridge

Use RV2 to set output level to match other CD tuner output level.

Looking at all the riaa info the best would be half passive and half active riaa as this would be the quietest hiss wise. This just involves moving the series components R2 + C1 to the C10 position on the dingo instead but there values need to be reworked to suit the output amp gain and value of R16. So it is best to start fully passive for ease. Our JLM99v should be quieter as the first opamp stage due to its low open loop gain.

Changes for Moving Coil

Resistor changes
R1 = 50 to 500ohm to match your cartridge as per manufacturer spec
R2 = 0R
R3 = 0R
R4 = 100k
R5 = 150R
R6 = 20k

Capacitor changes
C2 = 100uF
C3 = Cload recommended for your cartridge