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Old 18th March 2014, 09:16 AM   #1
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Default Unusual phono preamp

A long time ago (probably in the mid 1990s) Elektor published a rather innovative RIAA phono preamp based on two cascaded opamps. The first opamp would act as the low pass section of the RIAA equalizer, the second opamp was used for the necessary bass lift, as far as I can remember. This was published as part of a larger collection of schematics in one of the July/August double issues or in a Christmas issue, but it could as well have been in one of the later 30x Circuits books. The clever thing with this design is, that it is far less susceptible to input overload due to the very low gain of the first stage and its attenuation of the transients caused by record damage, and thus it actually reduces the effect of surface crackles caused by debris or scratches in the groove of a vinyl record. I never got to buoild this circuit mainly due to lack of time. Can anyone remember this circuit and possibly post a scan of the schematic ? I would like to test this circuit, as it may be very advantageous to use for digitizing old records. Your help would be deeply appreciated.
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