All You Need To Know About TL431 To Fix Stuff : Test in in and out of circuit, test feedback circuit

Let's take a look at the TL431 Programmable Zener. We find these little devices just about everywhere, in op-amp and comparator circuits and in constant current circuits, but one very common place we see TL431 is in Power Supplies. Here you can learn about the TL431 and what it does . Find out how to test these devices both in-circuit and out of circuit. We will end up learning how to test the entire feedback circuit of a switch mode PSU without unsoldering any components.
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