The operational amplifier, or op amp ... the TL072, the NE5534, the LM358, and of course the granddaddy of all, the uA741. If those part numbers don’t mean anything to you, all you need to ...
To amplify the voltage from the off-the-shelf pH probe, [chris] chose an LMV358A, a high-impedance FET-input version of the venerable LM358 op-amp, so as not to load down the probe. A negative ...
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