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Have you considered giving those a try? Hope it helps..

Thanks for the info guys! Asshole or not, the MAFAM design he posted looks great. I just managed to put mine together after all. I dialed in the variabale resistors, bench tested with different voltages and the outputs are perfect 1.1 gain across the whole range. Will see what kind of...

Hi Joe, Im trying to build MAFAM based on your description. The chip I am using is OPA340A. I am testing the circut with supply voltage from two AA batteries (~2.7V). The positive is connected to pin #3 and the negative is connected (through a resistor) to pin #2. The problem I'm having is...