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Feedback circuit clamps precisely

Based on a Labs project | October 2011 | Find it here
Feedback circuit clamps precisely
A linear circuit consisting of an input buffer, IC1a, and output-scaling amplifier, IC1b, two zener diodes, D1 and D2, and several other components can supply sharp, precise, bipolar clamp levels with continuous variable control, from 0 V to ±11 V. A feedback loop enclosing the amplifiers and zener diodes generates the high clamping accuracy.
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