[sdiy] using LM13700 in differential mode to reduce trimmers

[Eric Schlappi]

Hi All,

I've been experimenting with adding an inverting op amp and driving my
LM13700 (and other OTA circuits) differentially, which seems to let me drop
the traditional offset trimmer. I am also using precision thin film
resistors, which might help too.

Anyone else been down this path with positive or negative results?

[image: image.png]

Thanks,
Eric
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