In this post you will learn about this amazing BJT device called the Darlington Transistor. It was named after this genius engineer, Sidney Darlington, who came up with the idea. Basically it is like a special combo of two regular NPN or PNP bipolar junction transistors (BJTs) that are hooked up in a clever way. […]
How to Configure a MOSFET as a Switch
In our earlier discussions we observed that the N-channel Enhancement-mode MOSFET (e-MOSFET) operates effectively when supplied with a positive input voltage. This particular type of MOSFET boasts an exceptionally high input resistance—approaching infinity. This facilitates its use as a switch. This characteristic allows us to interface the MOSFET seamlessly with virtually any logic gate or […]
How MOSFETs Work: Depletion Type, Enhancement Type
In this post I will talk about another form of Field Effect Transistor (FET) that is not the Junction Field Effect Transistor (JFET) that you are probably familiar with. This device is known as the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) and is classified as Insulated Gate Field Effect Transistors (IGFET). The MOSFET is […]
Understanding Junction Field Effect Transistors, with Calculations
In this post I will talk about the Junction Field Effect Transistor, or in short, the JFET. This device is actually a unipolar device, which basically means that it has a pretty quick way of controlling the flow of current between its two electrodes. This happens because of an electric field that kicks in when […]
How to Use Transistors (BJTs) as ON/OFF Switch
In applications where we use a transistor or a BJT to amplify an AC signal, it becomes crucial to set its base bias voltage correctly. This allows the transistor to sit comfortably in its “active” zone, which means we are working within the linear range of the output characteristic curves. The exciting part is that […]
How PNP Transistors (BJTs) Work
When we talk of PNP BJTs, they are essentially the reverse of NPN transistors in structure. Instead of having two diodes alligned in the same direction, PNP transistors have them flipped around. This forms a Positive-Negative-Positive (PNP) configuration. If you look at the symbol for a PNP transistor, you will notice that there is an […]