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One of the very useful transformerless power supplies using Viper12A IC can be used in many applications. It is sufficient to run micro-controllers, sensors, displays, relays, and so on. With very few numbers of components, we can get a reliable transformerless power supply using Viper12A...
The basic of comparator: Comparator is one of the mode of Op-Amp circuit. It is pretty simple in configuration like this image below: The output of the comparator is high if the non-inverting input voltage is higher than the inverting input pin. And the output is low if the non-inverting pin...

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