Sometimes you need to know which wire/node is positive polarity and which wire/node is negative polarity.The LED as a polarity indicator circuit is show in above diagram. In the diagram as you can see ...

LEDs, like batteries, have polarity, which means that there is a specific direction that current must flow through them: it must enter through the positive lead and exit through the negative lead in ...

You can obtain a precise, positive-output voltage from a negative-voltage supply with a boost converter and a linear regulator. The input and output capabilities of the circuit in Figure 1 depend on ...