The configuration shown in the figure uses two PNP transistors to activate the load when the input goes high (Vdc). We can also use a higher power transistor for Q2, thus controlling higher power loads directly. We observed, however, that this configuration is not isolated, like the previous ones. For higher power transistors, consideration should be given to the need for them to use heat sinks. In this case, the power sector can also be supplied with a 5V voltage.
