MATRIXSYNTH: New EQ Board for the Rhodes Chroma

Saturday, July 09, 2011

New EQ Board for the Rhodes Chroma

via the excellent Rhodes Chroma site where you'll find full details.

"Why an new EQ-board?

Well, most mixers, FX devices and so on nowadays have balanced inputs/outputs. So why shouldn't such an old baby like the Chroma get that feature too? On the other hand the nearly obsolete CEM3360 VCAs on the EQ-board should better used as a replacement part on a faulty DVB as substituting them isn't an easy attempt for some reasons. The circuit is simple: a quad VCA SSM2164 (Z1) replaces the two dual CEM3360 VCAs. It's a current-in current-out device with 33mV/dB controls. Note: This not an OTA! The core looks more like a multiplier (see Figure 1). The (audio) voltages 0-3 coming from the CMB are converted into currents by the 30K resistors. The 510Ohms 470pF series pad from input to ground prevents oscillation."

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