OP-AMP lithium cell sensor with 0.75 gain

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Lithium cell sensor  with 0.75 gain
If you have an Arduino running on 3.3V you need to reduce input from 4.2 max for lithium-ion cell to within the range of the ADC on 3.3v Arduino.
This is a modification of 
http://everycircuit.com/circuit/5743192535465984l

published 7 years ago

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