Gas Sensor Board Write Up

Virgil

This maybe very old news... but was recently reviewing the Parallax CH4 Gas Sensor Module information.... I believe that the Op-Amp descriptions in the Theory of Operation does not correspond with the U1A and U1B identified in the schematic... U1A in the diagram is an op amp in the comparator configuration and U1B, the second half of this dual op-amp, is a unity gain amp buffer.... In the Theory of Operation write up the A's and B's perhaps,, should be reversed..... Probably an upgrade in the hardware configuration at Parallax which was not reflected in the 2010 circuit diagram.... A small item....

Virgil....