andre_chan Posted June 16, 2004 Report Share Posted June 16, 2004 Hello,I need to build moisture meter using dc resistance(1k to 50M 10 to 40% of Moisture).It is difficul to find Max4206(logarithmic amplifier) in my country(Indonesia). I had tried to build using opamp(OP07) and transistor(BC547), but doesn't work.I had tried this circuit(J. B. Calvert), but the output not stable.Some one can help me please! Quote Link to comment Share on other sites More sharing options...
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