![]() BJT Switch: Low side NPN BJT switch versus high side PNP BJT switch using bipolar junction transistors schematic diagrams by electronzap Includes 2N3904 NPN BJTs and 2N3906 PNP BJTs. Nice assortments of semiconductors that I use in my videos. Schematic symbols for NPN PNP BJTs N channel P channel JFETs and common MOSFET variations diagram by electronzap electronzapdotcom Hopefully there is a part number next to it. Whereas, the FET symbols that I use are just 1 of many ways that you will see them if you look at a lot of schematic diagrams. The BJT symbols shown below are used by almost everyone, although they may not be circled. NPN PNP Bipolar Junction Transistor BJT gain or beta current flow illustrated by electronzap ![]() It helps to remember these things when looking at a schematic with BJTs. ![]() A small amount of Base (to Emitter) current allows many times that amount of current to flow from Collector to Emitter. To support this site, check out the following links:īipolar Junction Transistors ( BJTs) have a variable amount of current that is allowed to flow from Collector to Emitter.Light Dependent PNP BJT switch circuit example:.Light Dependent NPN BJT switch circuit example:. ![]()
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