Simplistic NJFET RIAA

diyAudio Chief Moderator
Joined 2002
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Yes 300mV RMS is usable. Up to 500mV maybe, so to get 0.5mV at the -60dB MC output. The iRiaa passive networks saturate in the HF if with much input signal. They are also usually tuned for 50Ω Zout generator source. You will notice saturation when same frequency higher level square waves corners become well rounded.
 
I just assembled the PS and wondering what is the voltage out unloaded - I have 52.3 on both channels and something is telling me it is too high!

Thanks.

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diyAudio Chief Moderator
Joined 2002
Paid Member
Producing higher enough AC vs their nominal spec. At least when unloaded. If after loaded it won't result to below 50V DC you will have to up the value of the RD resistors. 10Ω value at least. So to create some RC voltage drop and counter the trend. 45V-49V DC loaded is safe. Consider 50V DC loaded as max at your local mains max.
 
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