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The Buchla 100 series' dual ring modulator (1960s), drawn in its Buchla Associates panel: "two independent ring modulators. Each output consists of the sums and differences between frequency components of two input signals. Original signals are suppressed about 55 db" (the 100 series catalogue). Each has two inputs and two outputs.

Key features

• Two independent ring modulators
• Sum and difference frequencies of two input signals
• Original signals suppressed about 55 dB