Table of Contents
Op amp non inverting comparators, have an output whose voltage is as high as it can go when the signal voltage is higher voltage than a reference voltage. Whereas, the output voltage drops as low as it can go when the signal voltage is lower than the reference voltage.
- Fixed value resistor voltage dividers are a simple way to make a reference voltage. The voltage will hold steady as long as the supply voltage holds steady.
- Trimpots are an easy way to get any percentage of the supply voltage that you want.
Both of these resistance based voltage dividers will not hold their voltage if they have to provide any significant amount of current. The op amp inputs just look at the voltage applied to them. Only a very small amount of current truckles through.
- Non inverting op amp:
- Reference voltage (usually fixed) is connected to the inverting input. Inverting input is indicated on the op amp schematic symbol with a – sign.
- Signal voltage, which varies depending on conditions at the source of the signal, is connected to the non inverting input. The non inverting input is indicated on the op amp schematic symbol with a + sign.
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