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the understanding of impedance matching and SWR through the best visual aid video  linked here. 

Transistors are active devices (components with the ability to electrically control current flow) that can be used as a switch, an amplifier, or to match impedances.There are three different ways (configurations) to connect bipolar junction transistors. The BJT has three terminal an emitter, a base, and a collector. Of the three possible ways of connecting […]

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Many times actuators (motors, relays, secondary control circuits, or other miscellaneous loads) require a separate power source than that of the controlling elements.(microcontroller, computer, or primary control circuit) In order to isolate separate power sources or keep output circuits from affecting the input circuits a device called an optical coupler can be used. Optical Coupling […]

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As I stated in a previous post, the common emitter configuration is the most widely used transistor configuration. The main characteristic that makes the common emitter configuration the most used is its high current gain. The applications for the common emitter configuration include amplifiers, phase inverters, and switches. For the following more specific applications including, […]