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This can act as an analog multiplier or divider. It multiplies the bottom input by the middle input and then multiplies that by the reciprocal of the top input. If the top is held at 1V, then it multiples the bottom two inputs by each other, acting as an analog multiplier, or a mixer if your dealing with RF. If you hold the bottom input at 1V, then the top two inputs are the divider inputs, with the middle input divided by the top input. Unfortunately, if any of the inputs are negative, it treats them as if they’re being held at 0V for the duration that they’re negative.
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