Need to switch something on or off using ... circuits. We’ve embedded his twenty-minute video after the break. In it he talks about the use of transistors, the difference between NPN and PNP ...

In the early days, PNP bipolar transistors were common, but the bulk of circuits you see today use NPN transistors. As [Aaron Danner] points out, many people think PNP transistors are “backward ...

These issues are especially important in protecting the fragile PCB traces in low-level circuits. A typical circuit ... output-supply current-sense circuit using a dual NPN transistor in place of the ...