The configuration in Figure 1 shows two dual Op Amps being controlled by a single quad E2POT. The gain range in this configuration can be trimmed between -0.5 to -2.0 over 64 steps. Increasing R5 and R6 (the feedback determining network in U2a for example) to 100KW will change the gain trim range to between -0.91 to -1.1. The inverting configuration shown is particularly suitable as this allows inputs signals to vary from ±10V without violating the digital pots terminal voltage specifications of ±5V.
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